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Malaysian Conference in Software Engineering (MySEC)

作者： Akkanat Chomchumpol Twittie Senivongse Chulalongkorn University Bangkok TH

Service technology, such as Web service, has been part of the mainstream of software development for some time due to its promising characteristics such as interface-implementation decoupling, reusability, and composability. Like other software, a service has to undergo maintenance during its lifetime to cope with changes in requirements and environment or to handle errors. Unfortunately certain changes of a service, especially service interface changes, can have effects on other parts of the system which use the service. It is therefore useful to determine service stability so that a service designer can determine how well the service-oriented system evolves while preserving the design. This paper proposes a stability measurement model for service-oriented systems. The model is based on logical stability of a Web service which is measured by the degree of unchanged elements of the service interface during its evolution from one version to another. The paper considers stability between any pair of service and system versions as well as the overall stability of the service and system which involve several parallel versions. The knowledge of service stability can help the service designer during maintenance of the serviceoriented system since the new service version should be designed to preserve stability and cause as minimal impacts as possible. The service designer can also observe how stable the services and the whole system are over their lifetime when considering service reuse or planning service maintenance cost and effort.

关键词： Web services Stability criteria object oriented modeling Measurement Maintenance engineering

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Comparison of post-relational and object-relational modelling for real-world database applications

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Journal of systems and Information Technology 2014年第4期16卷 313-340页

作者： Karanikolas, Nikitas N. Vassilakopoulos, Michael of Athens Athens Greece Department of Electrical and Computer Engineering University of Thessaly Volos Greece

Purpose – The purpose of this paper is to compare the use of two object-Relational models against the use of a post-Relational model for a realistic application. Although real-world applications, in most cases, can be adequately modeled by the Entity-Relationship (ER) model, the transformation to the popular Relational model alters the representation of structures common in reality, like multi-valued and composite fields. Alternative database models have been developed to overcome these shortcomings. design/methodology/approach – Based on the ER model of a medical application, this paper compares the information representation, manipulation and enforcement of integrity constraints through PostgreSQL and Oracle, against the use of a post-Relational model composed of the Conceptual Universal Database Language (CUDL) and the Conceptual Universal Database Language Abstraction Level (CAL). Findings – The CAL/CUDL pair, although more periphrastic for data definition, is simpler for data insertions, does not require the use of procedural code for data updates, produces clearer output for retrieval of attributes, can accomplish retrieval of rows based on conditions that address composite data with declarative statements and supports data validation for relationships between composite data without the need for procedural code. Research limitations/implications – To verify, in practice, the conclusions of the paper, complete implementation of a CAL/CUDL system is needed. Practical implications – The use of the CAL/CUDL pair would advance the productivity of database application development. Originality/value – This paper highlights the properties of realistic database-applications modelling and management that are desirable by developers and shows that these properties are better satisfied by the CAL/CUDL pair. © 2014, Emerald Group Publishing Limited.

关键词： object oriented programming

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AGENT-BASED MODELING OF ELECTRIC POWER MARKETS

AGENT-BASED MODELING OF ELECTRIC POWER MARKETS

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Winter Simulation Conference

作者： Macal, Charles Thimmapuram, Prakash Koritarov, Vladimir Conzelmann, Guenter Veselka, Thomas North, Michael Mahalik, Matthew Botterud, Audun Cirillo, Richard Argonne Natl Lab Decis & Informat Sci Div 9700 South Cass Ave Argonne IL 60439 USA

ISBN: (纸本)9781479974863

A novel agent-based model, the Electricity Market Complex Adaptive System (EMCAS) model, is designed to study market restructuring and the impact of new technologies on the power grid. The agent-based approach captures the complex interactions between the physical infrastructure and the economic behaviors of various agents operating in an electricity market. The electric power system model consists of power generating plants, transmission lines, and load centers. The electric power market is composed of generating company agents who bid capacity and prices into power pools administered by an Independent System Operator (ISO). The ISO agent balances supply and demand for day-ahead markets. EMCAS also simulates real-time market operation to account for the uncertainties in day-ahead forecasts and availability of generating units. This paper describes the model, its implementation, and its use to address questions of congestion management, price forecasting, market design, and market power.

关键词： multi-agent systems power engineering computing power generation economics power grids power markets power transmission lines EMCAS model ISO agent congestion management day-ahead forecasting day-ahead market economic behavior electric power markets agent-based modeling electric power system model electricity market complex adaptive system independent system operator load center physical infrastructure power generation plant power grid power transmission line price forecasting Adaptation models Companies ISO Load modeling object oriented modeling Power systems Unified modeling language Power transmission lines Power grids power markets Independent system operators object oriented modeling Power generation economics Power engineering computing UML power systems Load modeling ISO Multi-agent systems Companies Electric power electrical energy

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企业人事管理系统的设计与实现

企业人事管理系统的设计与实现

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作者：郭萧然厦门大学

学位级别：硕士

企业人事管理系统作为企业人事信息管理必不可少的工具，在越来越多的企业中得到了广泛的应用，为企业的发展打下了坚实的基础。但不可否认，目前我国企业整体信息化程度仍旧较低，加之人事管理工作核心内容的相对稳定，使得我国大多数... 详细信息

企业人事管理系统作为企业人事信息管理必不可少的工具，在越来越多的企业中得到了广泛的应用，为企业的发展打下了坚实的基础。但不可否认，目前我国企业整体信息化程度仍旧较低，加之人事管理工作核心内容的相对稳定，使得我国大多数企业的人事管理系统都处于较低端的状态，无形中造成大量人力资源的浪费。而纵观近年来关于企业人事管理系统方面的研究，大都是在重复的造轮子，并没有考虑到互联网、云计算、大数据等技术对企业的影响越来越大的现实因素，从而没能给构建能满足企业发展需求的人事管理系统提供较好的指导和比较实际的参考价值。　　本文在考虑到企业当前的需求和未来的发展的基础上，试图为企业构建具备良好扩展性的人事管理系统，以使得其能够在企业发展中更好的为企业进行服务。因此，本文在总结研究传统的人事管理系统的基础上，利用面向对象的设计思想，在采用一般方法的基础上软件构建技术的基础上，考虑了软件的可扩展性，利用B/S多层体系结构、功能模块化、动态加载和插件系统等扩展性方法和技术，结合其面临着的新变革和新要求，构建一个具有较高扩展性的人事管理系统。

关键词：企业经营人事管理系统程序设计面向对象浏览器/服务器模式

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Virtual Machine-Assisted Collaborative Junk object Detection

Virtual Machine-Assisted Collaborative Junk Object Detection

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作者： Ming Matthew Ma University of Waterloo

学位级别：硕士

Memory leak is unrecoverable software bug that causes performance degradation and re- liability issues to software applications. Although memory management systems exist in modern object oriented Language to reclaim unused memory store, memory leak can still happen, and continue to exhaust memory resource. In Java, where there is garbage col- lection for releasing unused objects, memory leaks manifest itself in the form of unused object retention. Since Java Programming language allocates objects on heap, the lifetime of an object deviates from the stack discipline, which can be a challenge in detecting Java memory leak. In this thesis, we propose a collaborative approach in detecting Java memory leaks through verifying object Lifetime Specification at runtime. We designed a runtime verifier that leverages Java Virtual Machine technologies to monitor and extract annotated infor- mation from the user application, and use that information to verify against Java Virtual Machine events to detect unintentional object retention in the Java application under test. We implemented our runtime verifier with Maxine Virtual Machine, an open source, meta-circular virtual machine developed by Oracle Lab, and conducted experiments and DaCapo benchmark to evaluate its accuracy and performance efficiency. The results show that the runtime verification tool successfully identifies junk objects for different semantic cases proposed in this thesis with certain runtime overhead. Through the research and experimental results, we further make implications on how to improve the performance overhead associated with current design and implementation methods in detecting unused object retention, which in the long term constitute memory leak and performance bug.

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An object-oriented design methodology based on object service tier (OST) middleware in HLA framework for the distributed simulation system environment

International Journal of Database Theory and Application

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International Journal of Database Theory and Application 2014年第5期7卷 187-200页

作者： Sikander, Usman

Promising the developers with the facility of distributed collaborative development for complex simulation applications, HLA (High Level Architecture) provides a baseline supporting the reuse of capabilities available in different simulations with a significant reduction in cost and time. Along with improved execution process and reusability, the induction of object oriented model in the implementation design of HLA also enable to take the advantage of latest object oriented features making design, implementation and maintainability easier and at each level of federate development and execution. The important areas to be addressed for design reconsideration consists of data exchange model and HLA communication layer. The data exchange model comprises of federates in federation and between runtime infrastructure and federation. The Federate object Model (FOM) architecture is not completely object oriented, the induction of object Service Tier (OST) middleware may offer a degree of FOM agility which is the ability of an application to adjust according to different FOMs (behaviors for Federates). Whereas, in HLA communication layer, customary HLA systems are based upon bidirectional call/callback interactions between federate. Several enhancements and changes anticipated in object oriented communication layer (OOP-COMM) introduced in object Service Tier (OST) as compared to native procedures, such as communication mechanisms, data encoding, session handling, distributed environment and performance analysis. The motivation behind the use of core object oriented modeling features and proposed object Service Tier (OST) middleware is the reuse of legacy systems, features which may further enhance the integration of distributed simulation systems and extension types. So, this paper provides a multidimensional analysis of important design aspects of object Service Tier (OST) middleware in HLA framework and devises some design constructs of object Service Tier (OST) using obj

关键词： Middleware

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公司设备管理系统的设计与实现

公司设备管理系统的设计与实现

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作者：徐枫厦门大学

学位级别：硕士

在企业的生产运维中，设备管理占有重要的地位，传统方式下的设备管理是以纯手工方式进行的，这样不仅浪费企业的人力资本，也消耗大量纸张，污染环境，在估算中，对设备的损耗产生的费用和相应的对设备的监控的效果也无法达到，纯手工... 详细信息

在企业的生产运维中，设备管理占有重要的地位，传统方式下的设备管理是以纯手工方式进行的，这样不仅浪费企业的人力资本，也消耗大量纸张，污染环境，在估算中，对设备的损耗产生的费用和相应的对设备的监控的效果也无法达到，纯手工的管理操作重复的概率很高，严重影响着工作效率。新的设备管理系统改变了以往手动方式的设备管理模式后，不仅可以简化企业的管理流程，而且能提高企业的管理效率，节约企业的管理成本。新的设备管理系统已经是现代企业管理公司不可缺少的武器，设备管理系统也将是企业或者公司对设备进行管理的必要选择。　　研究分析了国内外的设备管理信息系统，发现这些系统和企业需求存在两方面的不相符:其一是设备品种;其次是主要的管理环节。论文中详细介绍了该设备管理系统的工作流程，包括例行统计报表、统计分析报表、设备入库和出库、设备运行状态、设备报废维修登记，并描述了每个工作流程的概要设计、详细设计。　　本论文结合当前企业设备管理方面存在的问题和公司要求的构建系统模型，在开发系统时采用了.NET和SQLServer2005的开发环境，经过努力后，终于开发出与企业要求相符的设备管理信息系统。

关键词：企业经营设备管理系统软件设计信息化建设

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Agent-based modeling of electric power markets 14

Agent-based modeling of electric power markets

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Simulation Winter Conference

作者： Charles Macal Prakash Thimmapuram Vladimir Koritarov Guenter Conzelmann Thomas Veselka Michael North Matthew Mahalik Audun Botterud Richard Cirillo Decision & Information Sciences Division Argonne National Laboratory Argonne IL USA

关键词： Power systems Companies Load modeling ISO Adaptation models object oriented modeling Unified modeling language

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Investigations on object Constraints in Unified Software Development Process

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2nd International Conference on Advances in Computing and Information Technology (ACITY 2012)

作者： Sharma, Meena Vishwakarma, Rajeev G. Devi Ahilya Univ Inst Engn & Technol Indore Madhya Pradesh India Rajiv Gandhi Tech Univ MP SVITS Indore India

ISBN: (纸本)9783642315510

The object constraints can be described as the expressions that are used to insert important data in object oriented models. The object Management Group founded a worldwide standard for object-oriented analysis and design artifacts specifically the diagrams. The specification and standard, known as the Unified Modeling Language, comprises model diagrams and the allied and associated semantics. Unified Modeling Language is meant for modeling and, the object Constraint Language is the specification and standard for specifying expressions. These expressions add essential, crucial and critical information to object-oriented models and other object modeling workproducts. In Unified Software Development Process we have analysis & design discipline to have complete architecture and design of the system. Analysis & design discipline is followed by implementation discipline. The activities of the implementation phase are mainly captured in construction phase. In unified software development life cycle the expressions in the design model are forward engineered to produce or generate the source code. The source code that is generated depends a lot on the platform and the technology that are selected for the software development. We have investigated how the expressions are developed and incorporated in the models in an electronic business solution. Further object constraint language is used to form the expressions that are attached to the object oriented model and artifacts. Then models are forward engineered to generate the code. In a nutshell we produce code from abstract, models or diagrams making use of object constraints language that is to achieve round trip engineering format between model and code. In this paper we have generated expressions from object constraint perspective for a reward point system as applied to a customer in e-business. We have also evolved the Context Definition, Initial Values & Derivation Rules, Query Operations, Attributes and Operations in thi

关键词： UML OCL Model object oriented Analysis & design Unified Software development Process Context Definition Initial Values & Derivation Rules Query Operations Attributes and Operations

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Hybrid system modeling using the SIMANLib and ARENALib Modelica libraries

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SIMULATION MODELLING PRACTICE AND THEORY 2013年 37卷 1-17页

作者： Sanz, Victorino Urquia, Alfonso Cellier, Francois E. Dormido, Sebastian UNED Dpto Informat & Automat Madrid 28040 Spain ETH Dept Comp Sci CH-8092 Zurich Switzerland

The ARENALib and SIMANLib Modelica libraries replicate the basic functionality of the Arena simulation environment and the SIMAN language. These libraries facilitate describing discrete-event models using the Arena modeling methodology. ARENALib and SIMANLib models can be combined with other Modelica models in order to describe complex hybrid systems (i.e., combined continuous-time and discrete-event systems). The implementation and design of SIMANLib and ARENALib is discussed. The ARENALib components have been built in a modular fashion using SIMANLib. The SIMANLib components have been described as Parallel DEVS models and implemented using DEVSLib, a Modelica library previously developed by the authors to support the Parallel DEVS formalism. The use of Parallel DEVS as underlying mathematical formalism has facilitated the development and maintenance of SIMANLib. The modeling of two hybrid systems is discussed to illustrate the features and use of SIMANLib and ARENALib: firstly, a soaking-pit furnace;secondly, the malaria spread and an emergency hospital. DEVSLib, SIMANLib and ARENALib can be freely downloaded from http://***/. (c) 2013 Elsevier B.V. All rights reserved.

关键词： Modelica object-oriented modeling Hybrid systems Arena SIMAN Parallel DEVS

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