Quality of Software in Project Management Research Paper

Quality of Software in Project Management - Research Paper Example At the present, our lives are governed by complex and large size systems with more and more complicated software, as a result the safety, security, and consistency of these systems has turned out to be a main concern. Additionally, as the size and complexity of software in current systems grow, it has more imperfection, which harmfully affects the safety, security, and consistency of the systems. Normally, software is divided into two elements: These elements can be internal and external quality features. External quality features are those parts of a product that face its users, where internal quality features are those that do not interact with the users. However, the quality is conformance to product requirements and should be free. In this scenario, the job of software quality assurance is to ensure that the standards, processes, and procedures are correct for the project as well as are appropriately implemented. In fact, SQA and SQC are processes defined within CMMI, and come un der the support process area. However, in CMMI SQA/SQC is defined as process and product quality assurance (SQA, 2011; Sangeetha, SenthilKumar, Arumugam, & Akila, 2010). Basically, the quality assurance is a confusing subject. In fact, software quality cannot be defined for the reason that there is no single absolute and complete definition of its lexicon. However, research shows two methods to accomplish quality software systems.

The Influence of Essentialst Attitudes Portrayed in the Modern Day Sitcom on the Views and Beliefs of Modern Society Essay Example for Free

The Influence of Essentialst Attitudes Portrayed in the Modern Day Sitcom on the Views and Beliefs of Modern Society Essay The Influence of Essentialst Attitudes Portrayed in the Modern Day Sitcom on the Views and Beliefs of Modern Society. Throughout its long history, the sitcom has been commonly understood to define the cultural norms of modern society through such comedy techniques as satire and irony. Like modern society, certain characteristics of the sitcom have evolved over time, while others have remained consistent. The evolution of the sitcom coincides with the generational shift in attitudes of society towards certain beliefs and values. So, it would seem that there must be some sort of correlation between the evolution of the sitcom and that of society, as if one is the cause of the other. * * While this can be safely said about the effect of society in shaping the structure of the sitcom, whether the modern sitcom has a significant effect on the views and beliefs of society is debatable. This essay will demonstration that, although the modern version of this genre contains essentialist themes and characters, it does not promote essentialism and therefore does not negatively influence society. From the fifties to the eighties, sitcoms have adhered to a rigid structure involving a live studio audience and certain unchanging characteristics that would define the genre. They also conveyed a very apparent moral code. In the 90’s, Seinfeld’s seemingly non-existent moral code would see it labeled by some as â€Å"apolitical or nihilisticâ€Å" (Gencarella 2005,390). However, even if these aspersions were true, it would not necessarily follow that the audience would agree with these moral values and thus accept them as normal behavior. In any case, Gencarella (2005) argues that, although the four main characters do show an extent of self-interest, their moral behavior does not reflect the teachings of the show. Issues of race, gender and politics are still addressed but are presented in a different way than they were ten to forty years ago. * The ingredients of a successful sit-com consistently involve strong, sometimes iconic characters, which often represent stereotypes. Recent sitcoms have challenged and broadened the idea of traditional stereotypes. For example, Gencarella (2005,394) argues that the four main characters of Seinfeld represent four distinct political stereotypes: the individualist, the hierarchical, the egalitarian, and the fatalist. The way these political stereotypes interact with each other and their community have no doubt contributed to the comicality and thus the success of the show. * Unlike the 2005 sit-com The Office (American version), Seinfeld does not consistently display essentialist traits in its characters. It conveys essentialist themes through satirical situations involving essentialism. This is none more evident than the following example (â€Å"The Yada Yada†), which Gencarella (2005,398) also uses to describe the egalitarian nature of Kramer: * Jerry: Those people can be so touchy. * Kramer:â€Å"Those people. † Listen to yourself. * Jerry: What? * Kramer: You think that dentists are so different from me and you? * They come to this country just like everybody else in search of a dream! * Jerry: Kramer, he’s just a dentist. * Kramer:Yeah, and you’re an anti-dentite! * Jerry: I am not an anti-dentite! * Kramer:You’re a rabid anti-dentite! Oh, it starts with a few jokes and some slurs – â€Å"Hey denty! † Next thing you know you’re saying they should have their own schools! * Jerry: They do have their own schools! Jerry Seinfeld is clearly representing an essentialist point of view towards dentists. The absurdity of the situation, however, entails that this essentialist view is not being endorsed; rather it is being exposed in a ludicrous fashion. It shows the absurdity of prejudice and racism. This draws comparisons, as Detweiler (2012,730) explains, to Randy Newman’s defense of his controversial song Short People. The song criticises short people in an essentialist manner, describing them as having small voices and little beady eyes. Randy Newman explains, â€Å"that by choosing an object of prejudice so absurd, he might expose the absurdity of all prejudice†¦Ã¢â‚¬  * In the case of The Office (American version), Michael Scott is blatantly and shockingly racist, sexist and prejudice. The perception that the audience recognizes this view as essentialist, which is the basis of its humor, reinforces the idea that the text does not endorse this kind of behavior. As Detweiler (2012,730) describes, this is further broadcast by the occasional ironic facial expressions, to camera, of Michaels Scott’s colleague, Jim Halpert. Through the clever use of irony it sets an example of how not to act. * Due to the satirical and ironic nature of the sit-com, the question of whether the inclusion of stereotypes and essentialist views warrant a critique as a conclusively essentialist text depends solely on the audience’s interpretation of the text. The writer’s intention here is irrelevant.

Design Of Calipers For Post Polio Paralytic Patients Engineering Essay

Design Of Calipers For Post Polio Paralytic Patients Engineering Essay ABSTRACT Over 13 million in India people suffer from various locomotor disabilities, of which 4 million have been afflicted by polio. Polio destroys the nervous system and causes paralysis of the limbs. An orthosis or brace is required to provide support to compensate for the weakened muscles, maintain proper positioning and stability of the affected joints, restore weight-bearing capabilities to the affected legs and allow the patient to walk without the risk of falls and further fractures. The objective of this project is to develop a design for adjustable polio braces, taking into consideration hinge movement at the knee. The current designs of KAFO are made of Stainless Steel, Aluminium, Thermoplastics, Reinforced Carbon fibers etc. While Aluminium is light-weight, it does not provide the required stiffness for the caliper design; Stainless Steel is corrosion resistant and has great yield strength but is heavy. Hence material analysis is done to chose a material with density between that of Aluminium and Stainless Steel, but with high ultimate strength and high fatigue endurance limit. Also the currently available designs do not incorporate flexible movement at the knee thus discomforting the patient during travel etc. The proposed design is done using CAD tools. A pilot prototype is made in PVC and field-tested to determine if adjustments can be easily performed by the patient. Based on feedback from the field-testing, the final model was designed using Titanium scr aps. ABOUT THE COMPANY M/s. AAROPNA PROTESI PRIVATE LTD. is a medical implants surgical instruments manufacturing and trading company. Our choice of this company was based on its expertise in developing biomedical instruments and implants and its association as a subsidiary of its parent company parent M/s. TITANIUM TANTALUM PRODUCTS LTD, which is an ISO 9001:2008 certified company dealing in various Titanium Products for the past 29 years. The objective of the company is to establish the necessary world-class infrastructure for design, develop, manufacture, package, trade market the Orthopaedic, Neurosurgical, Orthodontic, Dental and other similar reconstructive / replacement implants and its surgical instruments in Titanium alloys and other advanced Biomaterial. Aaropna Protesi Private Ltd. deals with designing of medical implants through biomechanical laws and the development, customization and optimization of medical implants and instruments using technology of CAD-CAM Solutions. It trades in world-class imported medical implants, surgical instruments, tools other surgical accessories in India. It has more than two decades of experience in handling Titanium, Tantalum, Zirconium and Niobium through its parent company. INTRODUCTION 1.1 WHAT IS POLIOMYELITIS? Poliomyelitis, often known as polio or infantile paralysis, is an acute viral infectious disease spread from person to person, primarily via the fecal-oral route. [1] In about 1% of cases the virus enters the central nervous system, preferentially infecting and destroying motor neurons, leading to muscle weakness and acute flaccid paralysis. Different types of paralysis may occur, depending on the nerves involved; spinal polio is the most common form, characterized by asymmetric paralysis that most often involves the legs. [2] The term poliomyelitis is used to identify the disease caused by any of the three distinct variations of poliovirus. Two basic patterns of polio infection are described: a minor illness which does not involve the central nervous system (CNS), sometimes called abortive poliomyelitis, and a major illness involving the CNS, which may be paralytic or non-paralytic. [1] In most people with a normal immune system, a poliovirus infection is asymptomatic. The virus enters the central nervous system in about 3% of infections. Most patients with CNS involvement develop non-paralytic aseptic meningitis, with symptoms of headache, neck, back, abdominal and extremity pain, fever, vomiting, lethargy and irritability. [2][3] Approximately 1 in 1000 to 1 in 200 cases progress to paralytic disease, in which the muscles become weak, floppy and poorly controlled, and finally completely paralyzed; this condition is known as acute flaccid paralysis. [4] In many countries, polio or poliomyelitis was for many years the most common cause of physical disability in children.[1] Currently through vaccination programs, Polio has been eliminated in most countries, a size-able percentage of people are still affected by the crippling disease in India, Nepal, Nigeria and Afghanistan. Often the paralysis will gradually disappear, partly or completely. Any paralysis left after 7 months, however is usually permanent and certain secondary problems may develop, especially if precautions are not taken to prevent them. These problems are further disabilities or complications that can appear after, and because of, the original disability. Contracture of joints is one commonly encountered secondary problem. In this there is a shortening of muscles and tendons so that the full range of limb movement is prevented. [5] Fig. 1.1 Typical contractures in polio Other common deformities can cause deformities including over stretched joints and dislocations. Fig. 1.2 Deformities caused by polio 1.2 EVALUATING A PATIENTS NEED FOR AIDS AND PROCEDURES Step1: Observe the patient carefully and notice which parts of the body seem strong, and which seem weak. Differences between one side of the body and the other are identified such as differences in the length or thickness of the legs. Other deformities, unusual gait, tilt to one side, supporting limbs, position of hips, shoulder and curve of back are also observed. These early observations will help you know what parts of the body you most need to check for strength and range of motion. [5] Step2: This is the physical examination. It should usually include: Range-of-motion testing, especially where there might be contractures. Muscle testing, especially of muscles that may be weak. Also test muscles that need to be strong to make up for weak ones (such as arm and shoulder strength for crutch use). Check for deformities: contractures; dislocations (hip, knee, foot, shoulder and elbow); difference in leg length; tilt of hips and curve or abnormal shape of the back. Step3: After the physical exam, again observe how the patient moves or walks. The particular way of moving and walking is related with the physical findings (such as weakness of certain muscles, contractures, and leg length). Step4: Based on observations and tests, a study is done to understand what assistance might help the patient. Different aspects of the aid must be considered such as: benefit, cost, comfort, appearance, availability of materials, and whether the patient is comfortable. Step5: Once the assist device has been decided, the necessary measurements are taken to make the brace or aid. When making it, once again it is wise to put it together temporarily so that adjustments can be made before it is rivet, glue, or nail it into its final form. Step6: Have the patient try the brace or aid for a few days to get used to it and to see how well it works. If there is discomfort or any problems, alternate improvements or necessary adjustments should be made. 1.3 DESCRIPTION OF A CALIPER Braces or calipers are aids that help hold legs or other parts of the body in useful positions. They usually serve either one or both of the purposes given below: To provide support, strength/firmness to a weak joint (or joints). To help prevent or correct the deformity. ORTHOTIC DEVICE: An orthosis or orthotic is an orthopedic device that supports or corrects the function of a limb or the torso [6]. An orthopaedic brace or orthotic is an orthopaedic device used to: Control, guide, limit and/or immobilize an extremity, joint or body segment for a particular reason To restrict movement in a given direction To assist movement generally To reduce weight bearing forces for a particular purpose To aid rehabilitation from fractures after the removal of a cast To otherwise correct the shape and/or function of the body, to provide easier movement capability or reduce pain. [6] LOWER LIMB ORTHOSIS: A lower-limb orthotic is an external device that is attached to the lower limb as a whole or limb segment in order to improve its function by providing support, reducing pain through transferring load to another area or correcting flexible deformities. NOMENCLATURE FOR CALIPERS Calipers are named after the joints that they replace the function of. The following are the acronyms used: Ankle Foot Orthosis (A.F.O.) Knee Ankle Foot Orthosis (K.A.F.O.) Hip Knee Ankle Foot Orthosis (H.K.A.F.O.) ANKLE FOOT ORTHOSIS (A.F.O.s): Ankle foot orthoses are orthotic devices encompassing the  ankle  joint and all (or part) of the  foot. AFOs are externally applied and intended to control position and motion of the ankle, compensate for weakness, or correct deformities. [6]   Fig. 1.3 Ankle Foot Orthosis KNEE ANKLE FOOT ORTHOSIS (K.A.F.O.): A knee-ankle-foot orthosis provides flexion, extension and mediolateral stabilization of the knee; may provide free or locked knee motion, or adjustable range of motion [7]. A knee-ankle-foot orthotic is typically designed to enable patients suffering from weakness or lack of control of the knee joint to walk safely. It is also used as an independent walking device for a walking-impaired person whose lower limb is paralyzed or whose muscle function is lost due to his spinal cord injury, diseases (such as polio), cerebrovascular disorder, external wounds and so forth. It is comprised of a main hinge assembly, an ankle assembly, a foot plate; a lower leg housing member; an upper leg housing member and supporting structure. Fig. 1.4 Knee Ankle Foot Orthosis HIP KNEE ANKLE FOOT ORTHOSIS (H.K.A.F.O) HKAFO is basically a KAFO with addition of hip joint and pelvic section which  provide control to selected hip motions.   The motions included at the hip are front to back, side to side, and rotation. In the HKAFO there is a minimized risk of the hip  moving out of proper position or dislocating. In this type of caliper, the  hip and lower spine is stabilized in cases where the patient is weak or paralyzed. Fig. 1.5 Hip Knee Ankle Foot Orthosis The average weight of stainless steel calipers are given below. Table 1.1 Weight of conventional stainless steel calipers TYPE OF CALIPER WEIGHT (kg) A.F.O. 1.100 K.A.F.O. 1.600 H.K.A.F.O. 2.250 2. LITREATURE SURVEY Literatures on existing Calipers and design In the literature survey, various designs of existing calipers have been proposed. The patients comfort level, flexibility, cost-effectiveness and weight form the most important basis for the design of the caliper. Some of the recently published works are as follows: Table 2.1: Literature Survey SL.NO TITLE AUTHOR TECHNICAL DETAILS CONCLUSIONS/ LIMITATIONS 1. Anatomical Models of Diarthroidal Joints: Rigid Multibody Systems and Deformable Structures JH Heggard Computer Methods in Biomechanics and Biomedical Engineering- Volume 2, 2003 Mathematical methods to model diarthroidal joints. Modelling of the joints is necessary to be able to understand the difficulty faced in movement by a post-polio paralytic patient. The various forces and stresses acting on the joints were studied in order to understand various basic movements and to help in the design of calipers. 2. Bioengineering Analysis of Force Actions Transmitted by the Knee Joint JK Marrisson Biomedical Engineering, 5: 164-178, 1988 Determining forces acting on the knee joint as the caliper to be designed is a K.A.F.O(Knee-Ankle-Foot-Orthosis) caliper. Forces on knee joint during locomotion 3. Orthopaedic Prosthesis and Joint Implants Shan Fengwang, Lichun L, Michael J. Yaszemski Biomedical Engineering, 2: 1984 Study of Titanium and its properties such as biocompatibility, light weightedness, density, youngs modulus to check for its use in the manufacture of calipers Use of titanium in biomedical applications and how this could be extended to the manufacture of calipers and reduce the discomfort and weight of the same. 2.1 WORKFLOW Start Caliper Classification Similar Products Analysis Commercial Intelligence Material Selection Manufacturing Process Recognition of Tools and Machineries Development Design of Product Modelling Analysis Fabrication of Prototype Model Fabrication of Prototype Model Testing Verification I/P=O/P Stop Root cause analysis for failure Recognition of Caliper and its Application Fig. 2.1 Workflow 3. SELECTON OF MATERIAL For the design of a caliper, a material is chosen based on its physical properties such as tensile strength, elastic modulus, yield stress, etc. The choice of material is based on a comparative analysis of these factors. Ideally, a material should be chosen such that the caliper is: Comfortable Lightweight, yet strong Easy to handle Cost-effective Durable As attractive as possible Easy to manufacture [8] 3.1 MATERIALS CURRENTLY USED FOR PRODUCTION OF CALIPERS: Braces are made from various types of materials-plastic, elastic, metal, or a combination of similar materials.  At present calipers are of two types: Metallic made from Aluminum, Stainless steel Non-metallic- made from polypropylene, reinforced carbon Advantages of metallic calipers over non-metallic calipers: Less expensive to manufacture: Metallic calipers are cheaper to produce because those manufactured using poly-propylene require specialized moulds to shape the polymer. The biggest expense in making plastic braces is the plaster bandage used for casting a mold of the leg. Easier to customize for each patient: As the height and contours of each patient differs, the metal rods are easier to customize than plastic calipers. They are quick and easy to make They are more durable than plastic calipers. If used with sandals or clogs, in hot weather they are cooler than plastic. 3.2 TITANIUM AS AN ALTERNATIVE MATERIAL: 3.2.1 GENERAL PROPERTIES OF TITANIUM Titanium is a chemical element, metallic in nature whose chemical symbol is Ti , atomic number 22 and atomic weight 47.90. Ti is a transition metal silver in color It has the following properties: low density high tensile strength corrosion-resistant There are two allotropic forms and five naturally occurring isotopes of this element, 46Ti through 50Ti, with 48Ti being the most abundant (73.8%). [8] It is the ninth-most abundant element in the Earths crust (0.63% by mass) and the seventh-most abundant metal. [8] Titanium and its alloys possess suitable mechanical properties such as strength, bend strength and fatigue resistance to be used in load-bearing biomedical applications such as orthopaedics and dentistry. Titanium is a reactive metal. In air, water, or arbitrary electrolytes an oxide layer is formed on the surface of the material. This oxide belongs to one of the most resistant compounds in the mineral world. As the oxide layer is a dense film it protects the metal from chemical attack which is of importance in an aggressive biological environment. Within the human body, titanium is inert as the oxide layer which is formed is in contact with the biological tissue, is hardly soluble and in particular no ions are released that could react with other molecules. [9] There are 22 grades of commercially available alloyed and unalloyed titanium. Based on the application, a suitable grade is chosen. 3.2.2 COMPARATIVE STUDY OF STAINLESS STEEL, ALUMINIUM AND TITANIUM Metals used for the purpose of designing calipers are required to have both high static and cycle-dependent properties. Tensile yield and ultimate strength, modulus of elasticity, and fatigue endurance limit are the principal metallic strength attributes that must be determined. Wear resistance is also an important criterion for all biomaterials. Excessive wear can lead to premature mechanical failure of the replacement component. Table 3.1. Comparative study of the physical properties of the different materials PHYSICAL PROPERTIES MATERIALS Stainless steel Aluminium Titanium Density (g ·cmà ¢Ã‹â€ Ã¢â‚¬â„¢3) 9.0 2.70 4.51 Ultimate strength (MPa) 860 455 900 Yield strength (MPa) 520 400 830 Yield stress (MPa) 210-350 40-50 240-370 Youngs modulus (GPa) 205 70 110-125 Linear coefficient of thermal expansion ( °F-1) 7.810-6 12.910-6. 5.010-6 Density: Density of a material is defined as the concentration of matter as measured by the mass per unit volume. A higher density indicates a higher mass for a particular volume. Titanium has density between stainless steel and aluminium indicating that for the same volume of material, titanium is lighter than stainless steel but heavier than aluminium. Ultimate strength: Ultimate strength, also known as tensile strength, is defined as the maximum stress a material can withstand before necking. Ultimate strength should be desirably, high for a material. Titanium has ultimate strength higher than stainless steel and twice as high as aluminium indicating that it can withstand greater tensile stress i.e. it can withstand more stress before necking. Fig.3.1 Stress-Strain curve Yield Strength: Yield strength is defined as the property of a material to resist deformation. For a good material, the yield strength should be high. The yield strength for titanium is almost twice as high as stainless steel and aluminium indicating that it can withstand more stress without deforming permanently. Yield Stress: Yield stress is defined as the minimum amount of stress which when applied to the body causes permanent deformation. Even if the applied stress is removed at this point, the object does not return to its original dimensions. The yield stress of titanium is almost equal to stainless steel but more than 6 times than that of aluminium. Youngs Modulus: Youngs modulus is the ratio between stress applied and resulting strain. It is used as a measure of change in linear dimensions upon application of tensile stress. If this ratio is large, it indicates that the material can withstand stress better with less deformation. The Youngs Modulus of titanium is higher than aluminium but lesser than that of stainless steel. The modulus is an important concern in the orthopedic application of biomaterials because: Bone has a modulus on the order of 17 GPa. The discrepancy between the modulus of bone and that of the alloys used to support structural loads means that the metallic devices implanted in the body take a disproportionate share of the load applied as stress. According to Wolffs Law, bone adapts to applied stress. Because alloys cause stress shielding one result of the adaptation is that the bone associated with the implant does not become or remain as strong as it would in the absence of an implant. [12] Linear Coefficient of Expansion: Linear coefficient of expansion is defined as the increase in length per degree rise in temperature. If a metal is alternately subjected to heating and cooling cycles, it should maintain a certain tolerance of dimensions i.e. a low coefficient of thermal expansion is desirable. The linear coefficient of expansion of titanium is much lesser than both stainless steel and aluminium indicating that the change in the dimensions of the object with change in temperature is less, which is desirable. 3.2.3 GRADES OF TITANIUM There are 22 grades of commercially available alloyed and unalloyed titanium. [10] Referenced standards: ASTM- American Standards for Testing Materials This standard is issued under the fixed designation B 338 as revised on November 2003. [15] ASTM Specification for commercially pure titanium: F-67 Table 3.2 Grades of titanium GRADE COMPOSITION Grade 1 Unalloyed titanium Grade 2 Unalloyed titanium Grade 3 Unalloyed titanium Grade 7 Unalloyed titanium plus 0.12 to 0.25 % palladium Grade 9 Titanium alloy (3 % aluminum, 2.5 % vanadium) Grade 11 Unalloyed titanium plus 0.12 to 0.25 % palladium Grade 12 Titanium alloy (0.3 % molybdenum, 0.8 % nickel) Grade 13 Titanium alloy (0.5 % nickel, 0.05 % ruthenium) Grade 14 Titanium alloy (0.5 % nickel, 0.05 % ruthenium) Grade 15 Titanium alloy (0.5 % nickel, 0.05 % ruthenium) Grade 16 Unalloyed titanium plus 0.04 to 0.08 % palladium Grade 17 Unalloyed titanium plus 0.04 to 0.08 % palladium Grade 18 Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.04 to 0.08 % palladium Grade 26 Unalloyed titanium plus 0.08 to 0.14 % ruthenium Grade 27 Unalloyed titanium plus 0.08 to 0.14 % ruthenium Grade 28 Titanium alloy (3 % aluminum, 2.5 % vanadium) plus 0.08 to 0.14 % ruthenium Grade 30 Titanium alloy (0.3 % cobalt, 0.05 % palladium) Grade 31 Titanium alloy (0.3 % cobalt, 0.05 % palladium) Grade 33 Titanium alloy (0.4 % nickel, 0.015 % palladium, 0.025 % ruthenium, 0.15 % chromium) Grade 34 Titanium alloy (0.4 % nickel, 0.015 % palladium, 0.025 % ruthenium, 0.15 % chromium) Grade 35 Titanium alloy (4.5 % aluminum, 2 % molybdenum, 1.6 % vanadium, 0.5 % iron, 0.3 % silicon) Grade 36 Titanium alloy (45 % niobium) From the comparative study, the following conclusions were drawn: The yield stress, yield strength and ultimate strength are much higher for titanium. Hence it serves as a suitable material for calipers as it has to withstand the stress applied by the body weight and external forces. Lower stiffness of titanium with respect to stainless steel reduces the severity of stress-shielding. The density of titanium is lesser than stainless steel; therefore the calipers would be much lighter than those made of stainless steel, almost by half. As linear coefficient of thermal expansion is lesser for titanium, the caliper dimensions would not change much with change in temperature. Titanium is more corrosion resistant than stainless steel. Stainless steel relies on chromium to render it passive to corrosion. Titanium however develops passivity on its own from the stable oxide film that forms on its surface. Unalloyed titanium grade 2 has higher ductility and is hence, cast, formed, joined, and machined with relative ease as compared to the alloyed grades.   4. DESIGN OF CALIPER 4.1 DESIGN OF EXISTING CALIPERS 4.2 DEVELOPMENT OF IMPROVED DESIGN Software that was used for the development of caliper design: Autodesk Inventor Professional 2009. 4.2.1 ABOUT AUTODESK INVENTOR PROFESSIONAL 2009 Autodesk Inventor Professional 2009 helps you design, visualize and stimulate the end product desired digitally. It not only includes the 3D mechanical design and CAD productivity, but also the essential tooling of various parts of the end product required such as plastic, that lends itself to manufacturing, and also facilitating in validation of the product digitally, sparing the need to test with physical prototypes.    With the integration of motion simulation and stress analysis tools in Autodesk Inventor Professional 2009, marketing a product becomes a much easier. Effective prediction on how the product will work in real-time conditions can be done and also automation of important aspects of the design such as the injection molds for plastic parts help greatly in minimizing errors to a good extent.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  An intuitive design environment of Autodesk Inventor Professional 2009 helps in the development of initial sketches and models of different parts. Also, this software helps by automating the basic geometrical sketches to actual prototypes making using of materials such as plastic, steel frames, tubes etc. This therefore reduces the geometry burden and the time required to make necessary changes and bring about innovation in the product, thereby reducing the time it takes to reach the market. Validation, in earlier times, was a very time consuming and expensive process involving skilled specialists but Autodesk Inventor Professional 2009 has made the entire process very simple and simulation expertise is not required now. Simulation and optimization of designs digitally has become very easy due to this software. Simple user interface helps in part by part design and integration. Stress analysis can also be performed to evaluate areas of stress concentration and hence helps in distribution of the same by slight design modifications. Improved Design: Auto Desk Inventor 2009 supports all major drawing formats like DWG and some of the improved features compared to its previous versions include: Design views in high speed Saves a lot of time. Viewing of drawings and annotation takes very less time when compared to the previous versions. Betterment in error handling High level of intelligence to give suggestions regarding geometrical issues. Faster startup time Launch time is much faster when compared to previous versions. Part by part design view Immediate definition and change in any part including dimensions and coloring and suitable assembly instantly. New Standards for 3D Modeling Ease of Use Autodesk Inventor 2009 helps focusing on the problem rather than trying to gain expertise over using the software as such, owing to its advanced user interface and features, making complex dialog boxes redundant. Inventor Fusion Simple tools to explore new shapes and easy on the spot modification of model from any source. Improved design feature creation Better control over the geometry of the design with productivity uncompromised. Assembly design features [20] Assembly Snap tool Interference analysis and contact detection Assembly configurations Large assembly performance Frame Generator Weldments Content Center Design Doctor Direct manipulation It is an important feature of Autodesk Inventor Professional 2009 which helps in uninterrupted design workflow. Being able to control all the commands exactly at the point needed gives more room for free sketching, quicker assembly and better accuracy. Sustainable Design Material selection can now be done considering environmental effects and cost effectiveness. Using Autodesk, it is now possible to access environmental information on materials required for fabrication and make prudent decisions based on careful analysis. 4.2.2 ENGINEERING DRAWINGS OF THE CALIPER During the modeling, different parameters were measured which included Diameter of the mid- thigh Diameter of distal end of the thigh Distance between mid- thigh and distal end of the thigh Diameter of proximal end of the calf Distance between distal end of the thigh and proximal end of the calf Diameter of the distal end of the calf Distance between proximal and distal end of the calf Diameter of ankle Length of the foot Breadth of the toes Breadth of mid-foot Based on these parameters, the design of the calipers was developed using Autodesk Professional Inventor 2009 The drawing was modeled in parts and later assembled into the complete caliper as shown in the drawings. All dimensions are in mm Fig 4.1 Engineering drawing of KAFO All dimensions are in mm Fig 4.2 Engineering drawing of upper leg supporting structure (thigh) All dimensions are in mmFig 4.3 Engineering drawing of lower leg supporting structure (Calf) All dimensions are in mm Fig.4.4 Engineering drawing of the ankle and foot supporting structure All dimensions are in mm Fig 4.5 Engineering drawing of Ti-Strip1 All dimensions are in mm Fig 4.6 Engineering drawing of Ti-Strip 2 All dimensions are in mm Fig 4.7 Engineering drawing of Ti-Bend Strip Fig 4.8 Engineering drawing of the Male Clamp Fig 4.9 Engineering Drawing of Female Clamp Hence, by using Autodesk Inventor Professional 2009, the design for a caliper was developed. The different parts of the caliper were developed individually and later assembled to form a complete model. These diagrams are used as a basis for the development of the prototype. The major changes that were incorporated in the design were at the knee joint: Male and Female Clamp were used to replicate the hinge joint at the knee. In order to assist in easy bending of the caliper while sitting, a rivet was introduced which when unscrewed, will faclitate flexion at the knee. This is primarily useful while sitting and travelling as the caliper need not be completely removed. 5. DEVELOPMENT OF PROTOTYPE The development of prototype was conducted in essentially three steps: Development of PVC prototype Identification of problems and corresponding corrections made Development of titanium protoype 5.1 MANUFACTURING PROCESS There are five major steps in manufacturing the Polyvinylchloride prototype. They have been listed and enumerated below: Marking This is the foremost step in manufacturing. It is also known as Material Planning. Knowing the required dimensions is a prerequisite. Once the dimensions for every part of

Hacking Essay -- essays research papers fc

As the world becomes more and more reliant on computers the computer hacking industry is greatly rising. With people such as Kevin Mitnick, who is known as a "computer terrorist" (Kjochaiche 1), computerized information isn't safe any more. Kevin is known as "the most high-profiled computer criminal and responsible for more havoc in the computer world today."(1) He considered this a fun and easy task. He got caught and thrown into prison, but once he got out nothing changed. Kevin stated that as long as the technology is there it just calls to people to break into it. Computer hackers usually start off young, thinking that it is nothing but a little harmless fun. But as they get older, they realize it has turned into an addiction. The definition of a hacker according to the Hacker's Dictionary, "a person who enjoys exploring the details of programmable systems and how to stretch their capabilities."(Hackers 1) "The Internet is just another playing field." (Kjochaiche 3) "Hackers regard hacking as a game in which their mind is up against that of the system designers." (Hackers 3) The Internet allows the hackers to take files, programs, passwords, and other information from users that are using it. They use this as a tool to make it easier to beat "the system". There are three major types of hackers, one with good intentions but gets slapped in the face due to the bad reputation of others, there are the hackers with bad intentions, and there are the hackers that fit in between. The bad hacker category is the largest by far. "A bad hacker's motives are to punish someone or retaliate against the owner of a computer system."(2) Computer terrorists fall under this category. Some bad hackers may also hack just to challenge the programmer. The hacker feels that if they can break into it then they are much more superior than the person who actually wrote the software. They can feel so superior that t hey might enter a virus to eliminate a program that was not worthy of their abilities. One of the other many goals of a hacker is to steal passwords. Hackers can steal your password about four different ways. Intercepting your password through email is "not that difficult."(How are they getting my password? 1) This is by far the easiest method because all they have to do is take the email as ... ... out. â€Å"More often than not the hackers are soloists.†(Kjochaiche, 6) It is proven that when hackers work together they get caught more often. Hackers will always do their work just like doctors will always treat patience. With the growth of technology comes new threats, and new problems. â€Å"This will continue to be on the rise due to advances in the world.†(Hackers, 3) Millions and millions of dollars will be put to end this but this will not work because new ways of hacking will always be made. Bibliography Works Cited Computer Hackers [Online] Available Http://www.mc2.nu. Dellert, Brian. Interview with a Hacker [Online] Available http://www.rabble.com/xpress/1997.03.01/hacker.com January 3,1997. Espy, Bob. Crime on the Intenet [Online] Available http://www.techforum. com/tsld009.htm. Hackers [Online] Available http://scitsc.wlv.ac.uk/~cm5220/home.html. How are they getting my password? [Online] Available http://geocities.com/yosemite/2215/password.html. Kjochaiche, Ahmad. Kevin Mitnick: Computer Terrorist [Online] Available http://www.rmit.edu.au/lectures/. Orman, Neil. Is your computer hacker-proof? [Online] Available http://www.amcity.com/austin/index.html Septemeber 1, 1997

Four Software Development Methodologies

Student Name Student ID Student Signature Assessor Name Assessor's Signature Final Result / Grade Assessed By / Date Case Study Research (worth 20% of final grade)100 MarksSOF535: Application Design and DevelopmentVersion 1.1, Level 5, Credits 20New Zealand Diploma in Information Technology Technical Support Level 5Task 1: Requirement Gathering and Analysis(Total 40 Marks) comparison between four software development methodologies. Four Software Development MethodologiesWaterfall Development MethodologyThe Waterfall approach to systems analysis and design was the first established modern approach to building a system. This method was originally defined by Winston W. Royce in 1970, (â€Å"The Waterfall Development Methodology†, 2006). It quickly gained support from managers because everything flows logically from the beginning of a project through the end, (Jonasson, 2008). Sources differ when it comes to the specific steps in the Waterfall process.Rapid Application Development MethodologyRapid application development is a software development methodology that uses minimal planning in favor of rapid prototyping. A prototype is a working model that is functionally equivalent to a component of the product.In the RAD model, the functional modules are developed in parallel as prototypes and are integrated to make the complete product for faster product delivery. Since there is no detailed preplanning, it makes it easier to incorporate the changes within the development process.RAD projects follow iterative and incremental model and have small teams comprising of developers, domain experts, customer representatives and other IT resources working progressively on their component or prototype.The most important aspect for this model to be successful is to make sure that the prototypes developed are reusable.Agile Development MethodologyThere are many different forms of the  Agile development method  including: Scrum, Crystal, Extreme Programming (XP), and Feature-Driven Development (FDD).  Agile methods  attempt to minimize risk (such as bugs, cost overruns, and changing requirements) by developing the software in iterations that  are mini-increments of the new functionality. The benefit of multiple iterations is that it improves efficiency by finding and fixing defects and expectation mismatches early on.Agile methods rely on real-time communication, which fails to provide new users with documentation to get up to speed. They require a huge time commitment from the users, and is labor-intensive on the developers due to the need to fully complete each feature within each iteration for user approval. The benefits to the software are realized early on due to the incremental addition of the iterations. The Agile methods are similar to RAD, and  can be inefficient in large organizations. Programmers, management and organizations accustomed to the Waterfall Method may have difficulty adjusting to Agile, and often a hybrid approach works well for them.DevOps Deployment MethodologyDevOps deployment  is centered around organizational change that  enhances the collaboration between the departments responsible for different segments of the development life cycle, such as development, quality assurance and operations. It is focused on improving the time to market, lowering the failure rate of new releases, shortening the lead time between fixes, and prioritizing minimal disruption as well as maximum reliability. To achieve this, DevOps aims to automate its continuous deployment to ensure everything happens smoothly and reliably.Companies that use  DevOps  have benefitted by significantly reducing the time to market, improving customer satisfaction, improving product quality and improving productivity and efficiency of its employees. A few  drawbacks of DevOps includeappropriate methodology that is suitable for this project.It totally depends on the nature of the project. Many people might argue that Agile is the best methodology for software development and it does have significant advantages in most cases; however, saying â€Å"Agile is better than Waterfall† is like saying â€Å"A car is better than a boat†. They both have advantages and disadvantages depending on the environment.Agile/Scrum works best with projects that have high levels of uncertainty and require an adaptive approach. A plan-driven approach (what many people loosely call â€Å"Waterfall†) works best in situations where the requirements are fairly certain and there is some need for predictability of project costs and schedules. And, of course, that is not meant to imply that there is a binary and mutually-exclusive choice between two extremes. There are many ways to blend an adaptive (Agile) approach with a plan-driven approach in the right proportions to fit the situation.There is no â€Å"silver bullet† methodology that fits all possible projects and the right solution is to fit the methodology to the nature of the problem rather than force-fitting a project to some predefined methodology.https://blog.blackducksoftware.com/top-4-software-development-methodologiesTwo types of requirements1.Functional Requirements Functional requirements define the fundamental actions that system must perform.The functional requirements for the system are divided into three main categories, Reservation/Booking, Food, and Management. For further details, refer to the use cases.EXAMPLE 1.Reservation/BookingThe system shall record reservations.The system shall record the customer's first name.The system shall record the customer's last name. The system shall record the number of occupants.The system shall record the room number.The system shall display the default room rate.The system shall allow the default room rate to be changed.The system shall require a comment to be entered, describing the reason for changing the default room rate.The system shall record the customer's phone number.The system shall display whether or not the room is guaranteed. The system shall generate a unique confirmation number for each reservation.The system shall automatically cancel non-guaranteed reservations if the customer has not provided their credit card number by 6:00 pm on the check-in date.EXAMPLE 2FoodThe system shall track all meals purchased in the hotel (restaurant and room service). The system shall record payment and payment type for meals.The system shall bill the current room if payment is not made at time of service.The system shall accept reservations for the restaurant and room service.ManagementThe system shall display the hotel occupancy for a specified period of time (days; including past, present, and future dates).The system shall display projected occupancy for a period of time (days).The system shall display room revenue for a specified period of time (days).The system shall display food revenue for a specified period of time (days). The system shall display an exception report, showing where default room and food prices have been overridden.The system shall allow for the addition of information, regarding rooms, rates, menu items, prices, and user profiles.The system shall allow for the deletion of information, regarding rooms, rates, menu items, prices, and user profiles.The system shall allow for the modification of information, regarding rooms, rates, menu items, prices, and user profiles.The system shall allow managers to assign user passwords.

Basic Communication Process Essays

Basic Communication Process Essays Basic Communication Process Paper Basic Communication Process Paper What is communication? According to Hybel Weaver (2004, p7) the terms ‘Communication’ which is interact with others to share information and beliefs, exchange ideas and feelings, make plans and solve problems. Sometimes this interaction is done interpersonally, in a team or small group, in a conference and sometimes through the media or via computer. We may say that communication consists of transmitting information from one people to another. Communication theory is explains the process of transmitting information, the form and structure of the information, the function and effects of the information. The best ways to understand the communication is to look at models of the process which can help us to understand. Within this paper, we will emphasis â€Å"A Models of the Basic Communication Process† (Verderber Verderber, 2008) features whilst compare with other communication theory. A Model of the Basic Communication Process A Model of the Basic Communication Process which is expanded from the Liner Model of communication by adding feedback to this model, the essential components of communication includes: Sender, Receivers, Messages, Noise, Channels, Feedback and Context. These components are interactive. When two people are communicating, it describes each component’s movement and interdependence with other components which are constantly in transmission to each other. These components also show that communication is a process, it works together as a system, that interaction and transaction are both possible modes of communication. Now that we can see how these components relate during communication, we will discuss each one separately as follow. Sender Receivers Hybels Weaver (2004, p. 9) stated that in the most communication situations, each people are both a sender and receiver. They have information, ideas and feeling to share with others, this sharing is not a one-way process, when one people send ideas to the other people which is receives the message and the process is reversed. Sender translates the ideas or feelings into words or sounds and sent the message to the receiver that process called encoding. In the other hand, receiver to interpret the messages from the sender, that process called decoding. Messages Pearson, Nelson, Titsworth Harter (2006, p. 11) point out that communication messages take many forms which can communicate verbally and nonverbally. The message is a content of the interaction; it includes the symbols for us to use to communicate our ideas, as well as facial expressions, bodily movements etc. Some experts believe that communication stem only from messages that have a purpose. Each message is unique, even if the same message were to be created over and over again, it would be different with each others, although the words might be the same, the messages expressed would be quite different. Noise In the communication process, noise interferes with people receiving a message someone is sending or receiving message. The perceptive communicator realizes: Noise can have both internal and external causes. Internal noise is attributed to the psychological makeup, intellectual ability, or physical condition of communicators. External noise is attributed to the environment. Thus, noise includes distractions such as a loud siren, a disturbing odor, and a hot room; personal factors such as prejudices, daydreaming and feelings of inadequacy; and semantic factors such as uncertainty about what another person’s words are supposed to mean (Gamble 2008, p. 8) Channels Refer to Eunson (2005, p. 1), Channel is the route by which messages flow between sender and receivers. The communication channels allow us to see people’s facial expression and hear voices via radio or television. Communication rarely take place over one channel, it may be use two, three or four different channels simultaneously. Familiar channels include the different type which is include television, smoke signal, telephones, e mail, movies, voices, reports and so on. Feedback Another component in the communication process is feedback, Devito (2006, p. 7) described that the response to a message that a receiver sends back to a sender. Feedback enables a sender to determine whether the communication has been received and understood as intended. Feedback is a natural extension of effective receiving. Receivers have the responsibility of attending to, decoding and determining a message’s intended meaning. Effective of the communication, sender has the ability to understand the feedback and to adjust messages on the basis of that feedback. Context The context refers to surrounding in which communication occurs. Verderber Verderber (2008, p. 6) point out that the context includes: Physical Context, Social Context, Historical Context and Psychological Context. Each context have different characteristic: ? Physical context is the location, e. g. the environmental, the distance between communicators, seating arrangements, etc. ?Social Context refers to the status of relationship between the participants. ?Historical context is the background provided by previous communication event between the participants. ?Psychological context includes the moods and ideas of each people bring to the interpersonal experience. Each context will affect the degree of formality in the communication. What different with the transmission model of communication? Summarized Wood (2003, p. 17) said, transmission model was an early model of communication, which described it as a linear or one-way process. It also best known model of communication is one devised by Shannon and Weaver (1949). This model is in a simple, easily understood form and a general model that can be applied to most types of communication. The transmission model of communication consists of the following components: Sender, Receiver, Message, Code, Channel and Noise. In this model, it ignores the important component of the responding Feedback from the receiver. At this point, Wood (2003, p. 8) defined that: Feedback may be verbal, nonverbal, or both and it may be intentional or unintentional. Wilbur Schramm (1955) depicted feedback as a second kind of message in the communication process. Research has confirmed Schramm’s insight that feedback is important. Supervisors report that communication accuracy and on-the-job productivity rise when they encourage their subord inates to give feedback – ask questions, comment on supervisors’ messages, and respond to supervisory communication (Deal Kennedy, 1999) Communication relied on the feedback to make the necessary adjustments. Communication is an interactive process which relies on the active participation of both sender and receiver; therefore, the transmission model is not an accurate to reflect the complex nature of communication. It fails to allow explains of meaning which is so important to our success in communicating with each others. Overview Hybels Waeaver (2004 p. 28) concluded that everyone needs good communication skills. Communication is ongoing process in which people share ideas and feelings. The communication also is the interdependent process, the essential component of communication include: sender-receivers, messages, noise, channels, feedback and context. Communication plays a important role in all aspects of our lives. So that, effective communication help us to enhances our relationships and allows us to make connections with people from different cultures. Each of the communication process can improve our effectiveness as communicators by applying the guidelines and principles. ~ End ~ Reference List Devito, J 2006, Human Communication The Basic Course, 10th Edition, Pearson Education Inc. USA Eunson, B 2005, Communicating in the 21st Century, Wiley, Milton, Queensland Gamble, M Gamble, T 2005, Communication Works, 9th Edition, McGraw-Hill, New York. Hybels, S Weaver, R 2004, Communicating Effectively, 7th Edition, McGraw-Hill, New York Pearson, J, Nelson, P, Titsworth, S Harter, L 2006, Human Communication, 2nd Edition, McGraw-Hill, New York Wood, J 2003, Comm unication in Our Live, 3rd Edition, Wadsworth, a division of Thomson Learning, Inc, USA Verderber, R Verderber K 2008, Communicate, 12th Edition, Thomson Higher Education, USA