• Journal of the Korean Society of Systems Engineering
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• v.2 no.2
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• pp.21-26
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• 2006

In modern systems technology, increasingly more systems are anticipated to operate in real-time environment. These systems are usually complex to implement since it is not easy to satisfy the real-time requirement for both hardware and software components simultaneously. In this paper, we first review an object-oriented development process that was proposed earlier for software-intensive real-time system using the Unified Modeling Language (UML). We then study how to improve the problems that the UML approach might have. Applying the systems engineering(SE) process yields useful results which include : 1) an improved requirements management over the whole system life-cycle ; 2) a detailed scenario on how to carry out the SE process ; and 3) a conversion process from the text-based requirements to the UML-based graphic ones.

• The Transactions of the Korea Information Processing Society
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• v.3 no.1
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• pp.200-210
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• 1996

Re-engineering has the potential to improve software productivity and quality y across the entire life cycle. It involves improving the software maintenance process and improving existing systems by applying new technologies and tools to software maintenance. Re-engineering can help us understanding existing systems and discover software components(e.g., design structure, data structure that are common across systems. These common components then can be reused in the development (or redevelopment )of systems, thereby significantly shortening the time and lessening the risk of developing systems. The Object-Oriented paradigm has been known to improve software maintainability. There still exist many problems in recognizing object, attributes and operations that are conceptually integrated and constructing of object class. In this paper, we propose a method that defines a fundamental theories of re-engineering and a concept recognition for object- oriented paradigm. We also describe the re-engineering tool that translates the existing procedure-oriented program into object-oriented system. This tool has a strength to solve the conceptual integrity problem in object-oriented recognition.

• The Transactions of the Korea Information Processing Society
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• v.6 no.5
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• pp.1280-1290
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• 1999

Applying the change impact analysis to the distributed environment is not straightforward since it is based on the centralized system environment. In this paper, we investigate the change impact analysis of object-oriented shoftwares in the distributed environment. We first, categories the types of changes common in object-oriented software into three sets: data, method, and class level changes. We, then, analyze the impact of each set of changes and represent it in the form of a DPDG. A DPDG is a graph showing relationship of object oriented softwares - with data elements. classes, design documents, servers - in the distributed environment. DPDG searches element of software to retest when the software is changed. Thus, DPDG saves effort of software to retest. In this paper, We propose the table of firewall for retest elements that be discovered by DPDG and implement the table of firewall. The table of firewall is used VIST that we design a software testing tool. The VIST utilizes the minimized firewall, then saves efforts and costs of retesting for distributed object-oriented software.

• Journal of Astronomy and Space Sciences
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• v.15 no.2
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• pp.475-484
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• 1998

The object-oriented approach is a difficult method for engineers who are accustomed to other software development methods although it is an excellent software development approach. This paper presents a method for object-orineted modeling re-using DFD(Data Flow Diagram) and SC(Structure Chart) of structured analysis and design approach. This paper suggests an easy method for analysis and design using structured approach for object abstraction, which is one of the most difficult things in object-oriented approach.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.55 no.7
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• pp.297-305
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• 2006

This paper summarizes a development of visualization software for protective engineering in low-voltage power systems. The study is concentrated on the following aspects. First, a software engineering method is applied for designing the object-oriented program. The design and implementation of a Graphic User Interface(GUI) and its integration to a power system framework are developed using object-oriented programming(OOP) in Visual C++. Second, we develop the short circuit analysis module that oriented a low-voltage power system. It is possible to calculate a peak, symmetrical RMS, DC component and asymmetrical fault currents for each time. And it is the first software that can calculate the fault current for single branch of three-phase system. The calculation accuracy is compared with commercial software, and the libraries of low-voltage components are served for convenience use. Third, protective engineering functions are equipped. It is possible to automatically select the circuit breaker which based on the user input characteristics and the fault current calculation and examine the protective coordination. Through the case study, we verified that the developed software can be effectively used to examine the protective engineering in low-voltage power systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.19 no.10
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• pp.1935-1944
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• 1994

FMS is a distributed system composed of various programmable manufacturing hardware such as robots and NC machines. For the autonomous operation of such a system, an integrated software layer for the control and monitoring in needed on top of the manufacturing hardware. However, constructing and maintaining such a software layer is difficult due to the complexity of a underlying FMS and its frequently changing nature. To cope with this problem, this paper proposes an object-oriented FMS integration model, in which objects acting as virtual manufacturing cells are instantiated for each physical cell in the underlying object-oriented database. Various other entities involved in manufacturing processes and their relationship to the cell objects are also captured in the database. This paper describes the structure of this object-oriented FMS database on our prototype implementation called FREE.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.390-392
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• 2013

In the paper, design and implementation results of the reference station software are described for the WA-DGNSS that is currently developed in pseudo-realtime concept. The reference software is designed and implemented by applying the object oriented methodology.

• Journal of the Korean Society of Systems Engineering
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• v.13 no.1
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• pp.1-6
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• 2017

A stores management software which is embedded in the stores management system requires high-level reliability and real-time processing. It also required to implement and verify protocols which requires timing constraints to control various weapons. In this paper, we propose design methodology to design a stores management software and its support middleware based on the TMO (Time-triggered Message-triggered Object) model.

• The Journal of Society for e-Business Studies
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• v.8 no.2
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• pp.113-129
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• 2003

Component-based software development (CBSD) has been recognized effective reuse techniques for software development by many of researchers and companies. The purpose of CBSD is to produce a high quality software system quickly through using verified software component which is contained fine-grained business logics. This paper suggests the metrics and techniques for to extract component and its interface from legacy object oriented application. For extract component, we apply metrics to measure complexity, cohesion and coupling to the legacy system.

• The Transactions of the Korea Information Processing Society
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• v.5 no.10
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• pp.2567-2574
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• 1998

Many software engineering tools and techniques rely on fraphic representations of software, such as control flow graphs, program dependene graphs, or system dependence graphs. Existing graphic representations for object-oriented programs are compkicated, reduplicated. We thus propose a new graphic representation for object-oriented programs. Object-oriented Program Dependency Graph (OPDG). An OPDG consists of class dependence graph, class hierarchy graph and procedure dependence graph. Other features of OPDG are (1) the representation is compact; (2) the representation is easy to extend for the incremental development of a program; and (3) the repreesentation can be extended to provide dynamic information.