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Proceedings of the 54th ACM Technical Symposium on Computer Science Education V. 2

作者： Martin Henz National University of Singapore Singapore Singapore

ISBN: (纸本)9781450394338

In teaching university entry-level calculus, it proved useful to distinguish early from late transcendentals depending on the time at which transcendentals such as the exponential and logarithmic functions are introduced. I suggest we pose analogous "early X or late X" questions for first-year computer science courses. I propose a tentative list of concepts for which the "early or late" question might be worthy a discussion and argue that the approach allows us to pay attention to pedagogical choices rather than the choice of the programming language for CS1 and *** first calculus textbook by late Torontonian and mathematics educator James Drewry Stewart follows the traditional approach of late transcendentals where the transcendental logarithm function is introduced as an integral of ƒ (χ) = 1/χ and the transcendental exponential function as its inverse. Stewart and others realized that this approach deprives the concepts preceding integrals of these two transcendentals as interesting example functions. Stewart's early-transcendentals alternative introduces them-along with transcendental trigonometric functions-informally in the first chapter and uses these transcendentals throughout the *** we have analogous pedagogic choices in CS1 and CS2? An exhaustive approach would list all essential concepts in the first year in CS and analyse their prerequisite dependencies. To initiate a more focused discussion, I propose instead to limit the discourse to a handful of concepts, and explore their "early or late" question.

关键词： cs1 types functional programming object-oriented programming

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AN object-oriented APPROACH TO DATABASE SYSTEM IMPLEMENTATION

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ACM TRANSACTIONS ON DATABASE SYSTEMS 1981年第4期6卷 576-601页

作者： BAROODY, AJ DEWITT, DJ UNIV WISCONSIN DEPT COMP SCIMADISONWI 53706

Examines object-oriented programming as an implementation technique for database systems. The object-oriented approach encapsulates the representations of database entities and relationships with the procedures that manipulate them. To achieve this, the authors first define abstractions of the modeling constructs of the data model that describe their common properties and behavior. Then the authors represent the entity types and relationship types in the conceptual schema and the internal schema by objects that are instances of these abstractions. The generic procedures (data manipulation routines) that comprise the user interface can now be implemented as calls to the procedures associated with these objects. A generic procedure model of database implementation techniques is presented and discussed. several current database system implementation techniques are illustrated as examples of this model, followed by a critical analysis of the implementation technique based on the use of objects. The authors demonstrate that the object-oriented approach has advantages of data independence, run-time efficiency due to eliminating access to system descriptors, and support for low-level views

关键词： data independence data manipulation routines database systems high-level languages object-oriented programming procedural binding

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What vs. how: comparing students' testing and coding skills 13

What vs. how: comparing students' testing and coding skills

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Proceedings of the Fifteenth Australasian Computing Education Conference - Volume 136

作者： Colin Fidge Jim Hogan Ray Lister Queensland University of Technology Brisbane QLD Australia University of Technology Sydney Sydney NSW Australia

ISBN: (纸本)9781921770210

The well-known difficulties students exhibit when learning to program are often characterised as either difficulties in understanding the problem to be solved or difficulties in devising and coding a computational solution. It would therefore be helpful to understand which of these gives students the greatest trouble. Unit testing is a mainstay of large-scale software development and maintenance. A unit test suite serves not only for acceptance testing, but is also a form of requirements specification, as exemplified by agile programming methodologies in which the tests are developed before the corresponding program code. In order to better understand students' conceptual difficulties with programming, we conducted a series of experiments in which students were required to write both unit tests and program code for non-trivial problems. Their code and tests were then assessed separately for correctness and 'coverage', respectively. The results allowed us to directly compare students' abilities to characterise a computational problem, as a unit test suite, and develop a corresponding solution, as executable code. Since understanding a problem is a pre-requisite to solving it, we expected students' unit testing skills to be a strong predictor of their ability to successfully implement the corresponding program. Instead, however, we found that students' testing abilities lag well behind their coding skills.

关键词： learning to program unit testing object-oriented programming program specification

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Search Based Risk Reduction Supporting the Intelligent Components Selection Process

Search Based Risk Reduction Supporting the Intelligent Compo...

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CHILEAN Conference on Electrical, Electronics Engineering, Information and Communication Technologies (CHILECON)

作者： Pablo Valenzuela-Toledo Carlos Cares Mauricio Diéguez Departamento de Ciencias de Computación e Informática Universidad de La Frontera Avenida Francisco Salazar Chile Centro de Estudios de Ingeniería de Software Universidad de La Frontera Avenida Francisco Salazar Chile Departamento de Ciencias de Computación e Informática Universidad de La Frontera Avenida Francisco Salazar Temuco Chile

ISBN: (纸本)9781728131863

In Component-Based Software Engineering, the problem of selecting software components involve several risk factors. Traditionally, these have been identified and mitigated using software project management techniques. However, the new demand for intelligent components has added complexity to the process. Despite the success and technological advances, its development in an environment ready for production faces many challenges. There are numbers of technical issues that limit their adoption and selection, due to the introduction of new risk factors, different from traditional ones. Thus, our goal is to formulate a technique to minimize the risk in the intelligent component selection process. To achieve this goal, first, we review the literature to Figure out how software project management takes care of the risk and to identify and classify the risks factor associated with intelligent software components. Second, we formulate the component selection problem as a search based optimization problem. And Third, we illustrate our proposal by presenting an example in the context of an air pollution forecasting component. As a result, we were able to: (1) identify a lack of useful tools to manage the risk factor effectively in a software project; (2) we classify intelligent component associated risk; and (3) we introduce a risk management technique that supports the component selection process by maximizing requirement accomplishment, that is, minimizing the risk of the provision of the functionalities that satisfy the requirements. Overall, our work is an initial step in using search-based optimization in risk management to the component selection process.

关键词： air pollution object-oriented programming optimisation project management risk management search problems software management software management Risk Management Process selection object oriented programming component selection tabu search Project management Air contamination Risk Factors Risk Reduction management of resources

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object-oriented software metrics in software code vulnerability analysis

Object-oriented software metrics in software code vulnerabil...

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IEEE International Symposium on Innovations in Intelligent Systems and Applications (INISTA)

作者： Kristijan Kuk Petar Milić Stefan Denić University of Criminal Investigation and Police Studies Belgrade Serbia University in Priština - Kosovska Mitrovica Faculty of Technical Sciences Kosovska Mitrovica Serbia Ministry of Interior Republic of Serbia Belgrade Serbia

ISBN: (数字)9781728167992

ISBN: (纸本)9781728168005

Development of quality object-oriented software contains security as an integral aspect of that process. During that process, a ceaseless burden on the developers was posed in order to maximize the development and at the same time to reduce the expense and time invested in security. In this paper, the authors analyzed metrics for object-oriented software in order to evaluate and identify the relation between metric value and security of the software. Identification of these relations was achieved by study of software vulnerabilities with code level metrics. By using OWASP classification of vulnerabilities and experimental results, we proved that there was relation between metric values and possible security issues in software. For experimental code analysis, we have developed special software called SOFTMET.

关键词： object-oriented programming pattern classification security of data software metrics source code (software) Software measurement Data Security object oriented programming Pattern recognition computer software Metronidazole object orientation computer programs Security proprietary software Codes

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Research on a Model of Component-based Cooperative Design of Buildings

Research on a Model of Component-based Cooperative Design of...

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The 8th International Conference on Computer Supported Cooperative Work in Design(第八届计算机支持的协同工作设计国际会议)(CSCWD2004)

作者： Wei Cui Hong Liu Dept.of Computer Shandong Architecture and Engineering InstituteP.R.China School of Information Management Shandong Normal UniversityP.R.China

ISBN: (纸本)0780379411

With the development of informationtechnology, there have taken big changes inworm economy from 90s. It forms a constantglobal market which is full of much *** not only lays on individual capacity, butalso closely suit to the requirement of developingmarket. CSCWD (Computer SupportedCooperative Work in Design)provides asupporting environment in which participantswith difference background and knowledge canwork together to reduce the producing cycle, toincrease the product quality and to acceleratethe product proceeding. The cooperation is thekey to assure the success of product design andthe capacity of competition in market, It's achallenge for the method of traditional softwaredeveloping to develop cooperative designenvironment based on special area. This paperdescribes a method of component-based designof buildings, which is intended to facilitate thecooperation and assure the requirement ofbuildings design. Difference from the commonsoftware system, it fully think the property indeign of buildings and the supporting ofcooperation. It comprises communicationcomponent, the interface that organize thesoftware of buildings design, the database thatstores the component of buildings design, themechanism of data changing and the visualenvironment. It is satisfied with the requirementof cooperative design of buildings.

关键词： architecture building groupware design engineering software engineering object-oriented programming product design component-based cooperative design information technology CSCWD computer supported cooperative work product quality product proceeding product design software development software system communication component building design software building design database visual environment

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An analysis of difficulties encountered by novice alice programmers (abstract only) 14

An analysis of difficulties encountered by novice alice prog...

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Proceedings of the 45th ACM technical symposium on Computer science education

作者： Kuan-Yu Lin Janet Mei-Chuen Lin Hue-Ching Kao Taipei Municipal Jianguo High School Taipei Taiwan Roc National Taiwan Normal University Taipei Taiwan Roc Taipei Municipal Nan Gang High School Taipei Taiwan Roc

ISBN: (纸本)9781450326056

This study investigated the difficulties encountered by novice Alice programmers. The researchers conducted one-on-one clinical interviews with 22 10th-grade students at a senior high school in Taipei, Taiwan. The participants were offered nine Alice programming tasks, each requiring the use of a different set of programming constructs, which included objects, primitive methods, expressions, built-in functions, variables, conditional execution, repetition control, arrays, user-defined methods, and parameter passing. Each participant was observed closely as s/he worked through the given tasks. Whenever an impasse occurred while a student was trying to solve a problem, the observer would intervene by asking a sequence of questions with increasing specificity, ranging from strategic prompts to hints to provides, in order to determine the cause of the impasse. This study summarized the common difficulties for each of the Alice programming constructs used by the participants in the programming tasks, and students' difficulties were categorized into four types: connection, location, usage, and math-and-other difficulties. Students having connection difficulties were unable to apply appropriate programming constructs to implement the actions required; location difficulties indicated students? inability to locating, in the Alice interface, the programming constructs they needed; usage difficulties referred in general to semantic errors in a student's programs; whereas math-and-other difficulties were caused mainly by students' inadequate math knowledge. It is hoped that the findings of this research will help Alice instructors to improve their students' performance by familiarizing themselves with the existence of the identified difficulties, and by addressing the missing conceptions or misconceptions underlying those difficulties.

关键词： programming instruction object-oriented programming alice programming programming difficulties

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Clustering: composition for active object systems

Clustering: composition for active object systems

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： Bellur Craig Lea Shank Department of ECE Syracuse University USA Department of CS Suny Oswego

A model of object composition which facilitates the automation of the partitioning of an object-oriented application into groups of objects called clusters is presented. object clusters form the unit of distribution, representing both locality and concurrency within an application. Clusters reflect the "single threadedness" or sequentiality of the objects within them. The larger granularity of object clusters permits them to be supported efficiently at run time. A method of cluster formation for class based object oriented programming languages is introduced and preliminary results of a prototype implementation are described.< >

关键词： object-oriented languages object-oriented programming Parallel programming Compilers

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Partonomy and taxonomy in object-oriented thinking: junior high school students' perceptions of object-oriented basic concepts 06

Partonomy and taxonomy in object-oriented thinking: junior h...

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Working group reports on ITiCSE on Innovation and technology in computer science education

作者： Mariana Teif Orit Hazzan Technion - Israel Institute of Technology Haifa Israel

The study presented in this paper explores junior high school students' comprehension of basic OO concepts. It summarizes major (mis)conceptions demonstrated by the students in two main categories: confusion of (1... 详细信息

ISBN: (纸本)9781595936035

关键词： taxonomy junior high school students' perceptions object-oriented programming partonomy

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An Information Modeling Approach in Conceptual Design for Cooperative Design

An Information Modeling Approach in Conceptual Design for Co...

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The 8th International Conference on Computer Supported Cooperative Work in Design(第八届计算机支持的协同工作设计国际会议)(CSCWD2004)

作者： Dong-mei YU Fu-qing ZHAO Ya-hong YANG College of Electrical and Information Engineering Lanzhou Univ.of Tech.Lanzhou 730050China College of Civil Engineering Lanzhou Univ.of Tech.Lanzhou 730050China

ISBN: (纸本)0780379411

Information modeling is critical to the integration ofconceptual design and process planning. Aninformation model for conceptual design is provided inthis paper. Conceptual design is a key activity in earlyproduct development. It determines product functions,form, and the basic structure. Since majormanufacturing cost is determined in early design, it iscritical to be able to assess manufacturability and costas early as possible in the design process. A literaturereview of the current status of Computer-Aided Design(CAD) and Computer-Aided Process Planning (CAPP)software technologies reveals the lack of interfacestandards to enable the integration of these systems. Inorder to develop interface standards, informationmodels have to be first developed to define theinterfaces. An initial information model for conceptualprocess planning has been *** modelincludes an activity model and an object model formanufacturing process selection, resource selection,and cost and time estimation. The activity model setsthe context in which the objects are used forinformation sharing and exchange. The object modeldefines classes used in conceptual process *** main purpose of developing this model is to initiatethe development of standard interface specificationsthat are necessary for design and process planningintegration.

关键词： computer aided production planning process planning groupware product development CAD object-oriented programming information modeling conceptual design cooperative design product development computer-aided design computer-aided process planning manufacturing process selection resource selection cost estimation time estimation information sharing information exchange standard interface specifications

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