Reusability of Object Oriented Interfaces in UML Diagrams

Reusability of Object Oriented Interfaces in UML Diagrams I. INTRODUCTION In recent years, computer software is the single most important technology in the world. Software developers have continually attempted to develop new technologies due to the growing importance of computer software. In these developments some of them focused on a technology domain i.e. object oriented system/programming [22]. Metrics are difficult to collect and may not really measure the intended quality measures of software. Empirical validation is must to verify the usefulness of a metric in practical applications. A. Software Engineering Software engineering started with a humble beginning and it has slowly come into existence. Now, software engineering is the best solution to the software problems. Most of the programmers/developers view the software engineering as an engineering approach to develop the software [21]. B. Software Measurement If you cant measure its not Engineering community is a common quote by the engineering community [10]. Measurement is the basis for all science and engineering. Good measurements are necessary for successful process. Software measurement is still considerably less than optimal in terms of measurement techniques and the volume and reliability of published data [2]. Software measurement plays an important role for finding the quality and reliability of software products. The measurement activities require appropriate tools to calculate relevant metric values. At present large number of metric tools are available for software measurement [1]. The main objective of this paper is to find the reusability of interfaces in object oriented programming. 2. MEASUREMENTS AND METRICS Measurement is the technology that allows the software professional to make visible progress for improving the software related factors. Measurement is not only a performance factor that leads to behavioural changes but it is used to improve the factors that are being measured [2]. It is a clear note that measurement is necessary for the software development process to be successful. A. Traditional Metrics From 1976 traditional metrics have been used in software measures for measuring the software complexity. Nowadays, a large number of software metrics has been proposed to measure effort and quality. Traditional metrics are important to measure non object oriented programs [18]. Metrics are used as a controlling method in development and to measure either the process of development or various aspects of the product [10][14][26]. Traditional metrics are used to measure the complexity of the program and comment percentage of the program. B. Object Oriented Programming and Metrics Object oriented software is a more recent and important quality software than that of the old-style procedural software/program [24]. With the wide spread object oriented technology the subject of software engineering has received much attention over the last two decades [20][25]. Object oriented design and development are very important and popular concepts in todays development environment. Object oriented design and development requires a different approach to design, implementation and to the software metrics compared to standard set of metrics. Metrics are very essential and important to measure object oriented software programming [13]. The development of software metrics for object oriented technology / programming has received more attention. A large number of metrics have been developed by researchers and numerous tools are available to help assess design quality and to collect metrics from software programs, designs, quality and maintenance etc [5][19][23][24]. Many object oriented metrics proposed in literature survey lack theoretical proof and some have not been validated. The metrics that evaluate the object oriented programming concepts are: methods, classes, coupling and cohesion. Very few metrics are presented for object oriented interfaces. In this paper, a measurement has been proposed to calculate the reusability of interfaces in object oriented programming. 3. OBJECT ORIENTED INTERFACES The concept of an interface is old. Software engineering has been using interfaces for more than 25 years. Nowadays interfaces are heavily used in all disciplines especially in object oriented programming [7]. With interface construct, object oriented programming features a good concept with high potential code reusability. Interfaces are used to organize code and provide a solid boundary between the different levels of abstraction [17] [4]. It is good to use interfaces in large type of applications because interfaces make the software/program easier to extend, modify and integrate new features. An interface is a prototype for class. With the construct of an interface java allows a concept of high potential for producing a reusable code. Interfaces in object oriented programming just contain names and signatures of methods and attributes, but no method implementations. Interfaces are implemented by classes. The inheritance hierarchy of interfaces is independent than that of class inheritance tree. Therefore object oriented languages like java gives higher potential to produce reusable code than abstract classes [15] [9] [16]. 4. REUSABILITY Reusability is always an interesting topic with shining promise. Reusable code is an effective combination 2 concept. * Properly defined interface definitions and * Efficiently defined class structure and inheritance. In this paper, the authors followed the first concept of reusability and measured the metric for interface reusability by giving a new formula. One benefit of defining interface is that every class that implements an interface must be inline with the interfaces functional requirements. Large amount of code sharing occurs within each implementation classes. Based on the class structure designed at the development time the implementation classes are organized according to their interface group type and inheritance allowed to access common logic. Reusability is an important factor for the software community people because it is the ability to reuse a number of software artefacts in terms of requirements, architecture, plans, cost estimates, designs, source code, data elements, interfaces, screens, user manuals, test plans and test cases. Software reusability is an experimental one under the impact of new tools and programming languages. The measurement of software/program and the software development process are much needed for software professionals attempting to improve their software process. Reusability of software increase productivity and quality and reduce the cost [2][3][6]. So in this paper, the reusability is measured for object oriented programming interfaces using the new formula. 5. BACK GROUND SUPPORT PROPOSED APPROACH Measurement is not just a software activity. A good measurement process is an effective method for demonstrating new tools and process improvements. An accurate measurement is a prerequisite process for all engineering disciplines and software engineering is not an exceptional one for calculating the accurate results. There is no significant work on the design of human computer interfaces. In literature, relatively little information has been published on metrics. Those metrics would provide limited insight into the quality and usability of the interface [12]. So the proposed approach is to derive a formula for calculating the reusability of interfaces accurately [23]. Deeper an interface in hierarchy leads to greater the reusability of inherited methods. When the depth of inheritance (DIT) of an interface increases the reusability of an interface also increases. So DIT of an interface has positive impact with the reusability of an interface. Reusability of interfaces are calculated by the following two ways: 1. Reusability of interfaces is calculated by using the formula: (RI) = Total No. of links to interfaces No. of interfaces. RI Total Reusability of interface diagram. 2. The reusability of interfaces in a diagram is calculated by using the formula:- Total Reusability of a diagram: RI = R (I1) + R (I2) +.R (In); R- Reusability and I1..In are Interfaces In each diagram the reusability of an interface is calculated by using the formula and all interface reusability must be added to find the total reusability of interface diagram. In both ways i.e. according to formula 1 and 2 the values are equal. This is shown in table 1, 2 and 3. 6. EMPIRICAL STUDY To validate the formula empirically three object-oriented diagrams are used to calculate the values for reusability of an interface for each diagram. Figure 1 shows object oriented design diagram shapes interfaces. Table 1 shows the values of reusability of each interface and total reusability of interfaces using the above formula. TABLE 1. REUSABILITY OF INTERFACES FOR SHAPES RI = Total Reusability of a diagram L-I = Reusability of an interface I=1 since reusability is calculated for each interface. No. of interfaces = 1. In the above table 1 RI is calculated by using the formula 1 and 2. TABLE 2. VALUES OF INTERFACE REUSABILITY 7. CONCLUSION Many simplistic metrics do not capture the importance of whatever it is that it has to measure. Many developers and software engineers are experiencing the benefits and uses of reusability in completion of the project with in the time and cost. Many other programmers and developers believe that software reuse will help in reducing cost and provide other benefits in software development. Object oriented programming software is more reusable than functionally decomposed software. Software reuse increases production and quality of software and reduces software development cost and time. Reusability is an attribute of software quality. By measuring reusability we can measure software quality. The authors have proposed a new metric to measure the reusability of interfaces in object oriented programming. As software is being developed, it is very good and important to keep an eye on the various parameters. The authors used three UML object oriented diagrams to validate the formula. Hence, this approach is an eye-opener to measure reusability of interface diagram. REFERENCES [1] Bakar N.S.A.A. Boughton .C,Using a Combination of Measurement Tools to Extract Metrics from Open Source Projects, Proceedings of Software Engineering and Applications of 2008. [2] Capers Jones, Applied Software Measurement-Global Analysis and Productivity Quality, 3rd Edition. [3] Christopher L. Brooks, Christopher G.Buell, A Tool for Automatically Gathering Object-Oriented Metrics, IEEE, 1994. [4] Dirk Riehle and Erica Dubach,Working With Java Interfaces and Classes-How to Separate Interfaces from Implementations, P.No:35-46, Published in Java Report 4, 1999 [5] El Hachemi Alikacem, Houari A. Sahraoui, Generic Metric Extraction Framework,IWSM/Metrickon, Software Measurement Conference 2006. [6] Etzkorn W.E., Hughes, Jr W.E. and Davis C.G. ,Automated reusability quality analysis of OO legacy software, Information and Software Technology, Volume 43 , Issue 5, April 2001,P.No:295-308. [7] FriedRich Steimann, Philip Mayer, Andreas MeiBner,Decoupling Classes with Inferred Interfaces , Proceedings of 2006 ACM, Symposium on Applied Computing, Pg.No:1404-1408. [8] Hector M. Olague , Letha H. Etzkorn, Senior Member, IEEE, Sampson Gholtson and Stephen Quattlebaum ,Empirical Validation of Three Software Metrics Suites to Predict Fault-Proneness of Object-Oriented Classes Developed Using Highly Iterative or Agile Software Development Processes,IEEE Transactions on Software Engineering, Vol. 33,No.6,June 2007. [9] ISRD GROUP,Introduction to Object Oriented Programming through JAVA,TATA Mc Graw Hill, Pg.No:109. [10] Ivar Jacobson, Magnus Christerson, Patrick Johnson, Gunnar OverGarrd,Object Oriented Software Engineering-A Use Case Driven Approach, P.NO:468, Pearson Education @ 2001. [11] Ken Pugh, Object Oriented Design, Chapter 5, Inheritance and Interfaces, The Pragmatic Programmers, LLC, 2005. [12] Khan R.A., K.Mustafa And S.A.Ahson, Software Quality Concepts And Practices, P.No:140. [13] Linda H. Rosenberg,Applying and Interpreting Object Oriented Metrics, Presented at the Software Technology Conference, Utah, April 1998. [14] Madumathi I. B.Palaniappan,A Tool for Extracting Object Oriented Metrics,International Journal of Computing and Applications ,2007. [15] Markus Mohenen, Interfaces with Default Implementations in Java, Aachen University of Technology. [16] Markus Mohnen,Interfaces with Default Implementations in Java,Technical Report, RWTH Aachen,April 2002. [17] Matthew Cochran,Coding Better: Using Classes Vs. Interfaces, January 18th, 2009. [18] Nachiappan Nagappan, Thomas Ball and Andreas Zeller, Mining Metrics to Predict Component Failures, Verification and Measurement Group , Microsoft Research, 2005, Redmond, Washington. [19] Neville I. Churcher, Martin J. Sheppered, ACM Software Engineering Notes, Vol.20, Issue 2, P.No:69-75, April 1995. [20] Pradeep Kumar Bhatia, Rajbeer Mann, An Approach to Measure Software Reusability of OO Design , Proceedings of 2nd International Conference on Challenges Opportunities in Information Technology,COIT-2008,RIMT-IET,March 29,2008. [21] Rajib Mall ,Fundamentals of Software Engineering, Chapter 1, Pg.No:1-18,2nd Edition, April 2004. [22] Roger S. Pressman,Software Engineering a Practitioners Approach, 6th Edition. [23] Rudiger Lincke, Jonas Lundberg and Welf Lowe,Comparing Software Metrics tools,ISSTA 08,July 20-24,2008. [24] Santonu Sarkar, Member, IEEE, Avinash C. Kak, and Girish Maskeri Rama, Metrics for Measuring the Quality of Modularization of Large-Scale Object-Oriented Software, IEEE Transactions on Software Engineering, Vol. 34, No. 5, Sep-Oct 2008. [25] Terry .C. and Dikel .D.,Reuse Library Standards Aid Users in Setting up Organizational Reuse Programs,Embedded System Programming Product News,1996. [26] Victor Laing and Charles Coleman,Principal Components of Orthoganal Object-Oriented Metrics, Nov.20th 2008,

Challenges Of Minority Groups In Cambodia Education Essay

IntroductionCambodia is a underdeveloped state, which is located in South East Asia, and most of the citizens are Buddhist and Khmer is their female parent lingua. On the one manus, there are diverse states populating together such as: Chinese, Cham, Vietnamese and others including cultural minority groups who are populating in the northeasterly states of Cambodia. ( UNESCO & A ; CARE, 2005 ) . Recently, 34.5 % of instructors in distant countries and 6.4 % in rural countries have non attended higher instruction. Many rural households depend on agribusiness for a life, and instruction costs are the highest disbursal they are confronting. Basically, they are impossible to direct all of their kids to school, particularly misss because of the personal security, and long distance between schools in rural and distant countries ( UNESCO, 2010 ) . This survey besides mentions that kids who do non go to school and who probably bead out are the kids with disablements, misss and kids from rural , distant and boundary line countries ( p. 29 ) . It is truly hard for them to analyze because of their linguistic communications use, finally bilingual instruction is incorporating and accommodating into communities. Teachers from the local communities are trained to run into the educational demands of the kids in the communities, clip tabular array are adapted base on farming seasons, and the schools are run by Community Boards ( UNESCO & A ; CARE, 2005 ) . The intent of this research is concentrating on the undermentioned inquiries: What are the better schemes to better minority groups ‘ instruction to run into MoEYS ‘s aims and vision? Does the bilingual instruction undertaking help minority groups to make higher and better instruction? What can MoEYS, Cambodia Government every bit good as NGOs contribute to develop minority group instruction? Ministry of Education, Youth and Sport of Cambodia As the Ministry of Education, Youth and Sport ‘s vision in the Education Strategic Plan 2009-2013 ( 2010 ) stated that â€Å" in order to develop a knowledge-based society within Cambodia it has to set up and develop human resources with the highest quality and moralss † ( p. 1 ) . To accomplish this vision, MoEYS has the mission of taking, managing and developing the Education, Youth and Sport sector in Cambodia in response to the socio-economic and cultural development demands of its people and the world of regionalization and globalisation. Meanwhile, a long-run aim of the MoEYS is to accomplish the holistic development of Cambodia ‘s immature people for all sectors and an immediate aim is besides to do certain that all Kampuchean kids and young person have equal chance to derive quality of instruction consistent with the Constitution and the Royal Government ‘s committedness to the UN Child Rights Convention, irrespective of societal position, geographics , ethnicity, faith, linguistic communication, gender and physical signifier ( p. 2 ) . To win in accomplishing the above aims and vision, MoEYS has defined three chief policy precedences and two are mentioned as follows: Ensure just entree to educational services by constructing schools every bit near as possible to abodes, diminishing the figure of uncomplete primary schools, increasing operational budgets to schools, increasing the supply of instructors, supplying houses to instructors and edifice residence halls for pupils in deprived countries, particularly misss, disablements and minority groups ( p. 13 ) . In order to accomplish this policy, there many schemes raised in this Education Strategic Plan 2009-2013 by MoEYS and some are showing here. The first scheme is to guarantee entry of all six twelvemonth olds into primary school including kids from hapless households, kid labourers, kids in deprived countries, kids with disablements, kids affected by HIV/AIDS, and cultural minority groups. The 2nd aim is to increase chances for just entree to higher instruction through increasing the figure of scholarships for prioritized pupils from hapless households, females and pupils from distant countrie s ( p. 15 ) . Similarly, the Education Sector Support Program 2006-2010 by MoEYS ( 2005 ) besides stated that â€Å" the secondary schools scholarships plan aims will be to guarantee increased instruction chances for pupils with high academic virtue from the poorest and deprived households, particularly misss and cultural minorities, through a gradual addition in the figure of targeted scholarships for the hapless † ( p. 27 ) To better the quality and efficiency of educational services by increasing the proviso of school instructional stuffs, libraries and research labs, and go oning to further develop the course of study, increasing acquisition hours and supplying scholarships ( hard currency and nutrient ) to hapless pupils, heightening instruction and direction capacities, beef uping the instructors ‘ codification of behavior, bettering schools ‘ environment, spread outing vocational orientation, increasing review of disposal, finance and instruction quality confidence ( MoEYS, 2010, pp.13-15 ) Economic state of affairs of minority groups Peoples who are populating in the rural and distant countries do non hold easy entree to all the possibilities markets, particularly concerns. Their lives are depending on the season, and when the planting clip come most people are working in the Fieldss. They have to pass most of their clip in the Fieldss in order to gain higher income to back up the households and communities. Their incomes come from selling rice, handcrafts and veggies but it is still really low. They can gain about eighty seven thousand riel or under 20 two dollars per month per family. Before acquiring this money they have to go to markets to sell merchandises to Kampuchean bargainers and purchase something that they on a regular basis need such as: baccy, coffin nails, medical specialties, apparels and some nutrients. Therefore, there is really small clip left for them to believe of instruction or directing their kids to schools particularly misss who are non literate at all. Additionally, merely a few work forces are literate ( UNESCO, 2005 ) Basic information of minority groups instruction Duos to the conditions of life are far off from the business districts, minority groups do non hold easy to schools. Harmonizing to UNCESO ( 2005 ) , â€Å" instruction degrees were higher for males than females ; no female aged 15 and over had completed primary school, and merely 8.2 % have had any instruction at all. The bulk of villagers were 77.8 % nonreader in Khmer, and aged 15 and over spoke small or no Khmer 83.5 % † . ( p.22 ) Races and ethnicity groups in Cambodia Recently, Cambodia is developing all sectors particularly education sectors in different finishs including urban and rural countries, which are located far off from towns. Examples include the rural parts of Ratanakiri and Modulkiri which have higher rates of non-enrollment compared to national norms. Childs who are populating within minority groups are non reached because of their poorness state of affairs and rural location. So far, â€Å" there are 36 cultural minority groups in Cambodia accounting for about 4 per centum of the population † ( World Bank as cited in UNICEF, 2007, p.6 ) Bilingual instruction for minority groups To learn bilingual instruction to minority groups is hard because many are illiterate both in speech production and composing in Khmer. As a study from Chap & A ; Thomas, ( 2003 ) mentioned that â€Å" the spread is widening as ethic minority people fail to derive entree to instruction and development enterprises. The lingual barrier is the first challenge to accessing development and instruction as few people particularly adult females and kids from the cultural minority communities speak the national linguistic communication † . Chap and Thomas ( 2003 ) besides stated that about all-ethnic minority females and over 80 % of the males were illiterate and most kids had ne'er attended school. â€Å" The bilingual instruction pilot undertaking uses a theoretical account of direction that begins in the slang and progresses to Khmer so that pupils learn to read and compose both linguistic communications. Base on the undertaking, five minority linguistic communications now have alp habets utilizing the Khmer book, and the Kampuchean authorities has late approved all five alphabets. † ( p.1 ) . In add-on, the same study provinces that current bilingual attempts are concentrated on five linguistic communications in northeasterly Cambodia, with extra lingual research in several other linguistic communications which have populations scattered throughout the county. The Kampuchean governmental ends are to assist local people to function in all sectors in their place small towns and states including an accent on cultural minorities, with particular schemes to run into their specific demands and challenges, many of which differ from those of the lowland Khmer populations. Furthermore, this study states that the bilingual instruction scheme is of import for run intoing Cambodia ‘s national Education For All ( EFA ) ends and fundamentally we know that the effectual manner is to get down from the known and travel to the unknown because Khmer is a foreign lin guistic communication for the cultural minority groups, therefore they need to get down with their ain linguistic communication in order to entree Khmer. Based on this, bilingual instruction helps highland populations prosecute more to the full in development and nation-building and helps them to do development programs appropriate to their communities in order to guarantee a positive hereafter ( p.3 ) Decision Although the instruction of cultural minority kids is really complicated, the plans that address these issues have been implemented with considerable success as the consequence of partnerships between the authorities, NGOs, local communities, and giver bureaus. Meanwhile, bilingual instruction undertakings have been piloted by CARE, ICC, SCN and others in the northern boundary line states ( Mondulkiri, Preah Vihear, Ratanakiri, and Stung Treng ) utilizing the female parent lingua languages including Kawait, Kreung, Phnorng, Pompuon and Kou. Furthermore, bilingual instruction is expected to be developed based on the pilot plans and particular offers have been provided for instructors who are employed to remote and cultural minority countries. The MoEYS is developing Khmer books for the above five cultural minority groups in order to promote them to larn both mother lingua and the national linguistic communication, Khmer, utilizing both formal instruction and life accomplishments curri cula ( UNESCO, 2010, p.30 ) . In add-on, the authorities continues to set up residence halls for female pupils, construct schools at all degrees, particularly in rural and distant countries and they are besides increasing scholarships for hapless pupils. ( p.34 )

Insectivores - Insectivora - The Animal Encyclopedia

Insectivores (Insectivora) are a group of mammals that include hedgehogs, moonrats, shrews, and moles. Insectivores are generally small mammals with nocturnal habits. There are about 365 species of insectivores alive today. Most insectivores have small eyes and ears and a long snout. Some do not have visible ear flaps but have a keen sense of hearing. They have clawed toes on each foot, and the pattern and number of their teeth are rather primitive. Some insectivores such as otter-shrews and moonrats have a long body. Moles have a more cylindrical body, and hedgehogs have a round body. Some insectivores such as tree moles and shrews are adept tree climbers. Insectivores rely more on their sense of smell, hearing, and touch than their vision and some species of shrews can navigate their environment using echolocation. The bones in the inner ear of insectivores are different than other mammals. They lack an ossified temporal bone, and the tympanic membrane is attached to a bony tympanic ring while their middle ear is closed off by surrounding bones. Insectivores live in terrestrial habitats around the world. Additionally, some species of insectivores inhabit aquatic environments while others burrow. Moles spend most of their time below ground in their tunnels they excavate. Shrews generally live above ground and build burrows for shelter and sleeping. Some species live in boggy areas where rotting vegetation, rocks, and rotting logs are common. Other species inhabit arid regions including deserts. Moles and shrews are usually active throughout the year. Hedgehogs are easily recognized by their rotund shape and spines. Their spines consist of tough keratin and serve as a defense mechanism. When threatened, hedgehogs roll into a tight ball so their spines are exposed and their face and belly are protected. Hedgehogs are mostly nocturnal. As their name implies, insectivores feed on insects and other small invertebrates such as spiders and worms. The diet of insectivores is not restricted to invertebrates and also includes a wide variety of plants and animals. Water shrews feed on small fish, amphibians, and crustaceans while hedgehogs feed on birds eggs and small vertebrates. Many species of insectivores locate their prey using their keen sense of smell or by using their sense of touch. The star-nosed mole, for example, not only has a sharp sense of smell, but it also has a nose with many small and touch-sensitive tentacles that enable it to find and capture their prey. Classification Animals Chordates Mammals Insectivores There are four living subgroups of insectivores. These include the hedgehogs, moonrats, and gymnures (Erinaceidae); the shrews (Soricidae); the moles, tree moles and desmans (Talpidae); and the solenodons (Solenodontidae). Insectivores are thought to be most closely related to bats, hoofed mammals, and carnivores. The classification of insectivores is not well understood. Insectivores have a primitive mammalian body plan and are in many ways generic in their appearance. For this reason, insectivores have been classified in several other mammal groups in the past such as the tree shrews or elephant shrews. Additionally, some adaptations insectivores exhibit are convergent with the adaptations of other groups—a fact that further confuses the proper placement of insectivores within the mammals. Previous classification schemes once placed tree shrews and elephant shrews in the insectivores, but today they are classified in their own separate orders. It is possible that other animal groups such as golden moles may be removed from the insectivores as new information comes to light. Evolution Insectivores are considered to be among the most primitive groups of mammals. Some primitive traits insectivores still exhibit include a small brain and testes that do not descend into a scrotum.

Global Warming Is A Major Problem - 842 Words

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