• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.91-93
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• 2002

컴퓨터 성능의 향상으로 고비용의 수행을 요하는 뮤테이션 기법의 적용 가능성이 커지면서 뮤테이션 기법에 대한 연구가 다시 활성화되고 있다. 뮤테이션 기법에 대한 연구는 순차 프로그램에 대해서는 완성 단계인 것에 반해, 객체지향 프로그램에 대한 연구는 역사가 짧고 아직 초기 단계에 머무르고 있다. 본 논문에서는 현존하는 자바 뮤테이션 오퍼레이터를 모두 지원하는 뮤테이션 분석 도구인 MuJava/SC를 구현하고 이의 성능 개선 방안에 대해서 논의한다. MuJava/SC 구현에는 리플렉션 시스템을 사용하였는데 그 중에서 구조적 리플렉션이 객체지항 뮤데이션 도구의 구현에 적절히 이용됨을 보여주었다. MuJava/SC의 성능을 개선한다면 객체지향 프로그램의 뮤테이션 분석에 유용하게 사용될 수 있을 것이다.

• Journal of Korean Association for Spatial Structures
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• v.1 no.1 s.1
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• pp.135-142
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• 2001

This paper proposes structural analysis on the World Wide Web to form a part of the architectural design project. It purposes modeling space frames and a structural analysis program on the internet only by inputting basic data for forming a shape in the whole phase of space frame analysis. The analysis data is conducted by Oracle DBMS(DataBase Management System), GUI(Graphic User Internet) by Java Applet and connection with server and database by Java Servlet respectively. The result from modeling and analysis is provided as graphic and text file forms by web browsers. Programs can be executed irrespective of user's OS by using internet and highly-secured system is constructed taking advantage of Java. Of great efficiency is maintaining and recycling data as the whole is dealt by database from the beginning to the end of program.

• The KIPS Transactions:PartA
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• v.13A no.3 s.100
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• pp.205-210
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• 2006

To assist developing robust multithreaded software, we develop a thread monitoring system for multithreaded Java programs, which can trace or monitor running threads and synchronization. We design a monitoring system which has options to select interesting threads and synchronizations. Using this tool, programmers can monitor only interesting threads and synchronization in more details by selecting options. It also provides profile information after execution, which summarizes behavior of running threads and synchronizations during execution. We implement the system based on code inlining, and presents some experimental results.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.648-652
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• 2007

병행 Java 프로그램의 경합은 프로그램의 비결정성을 초래하므로 반드시 탐지되어야 한다. 이러한 경합을 수행 중에 탐지하기 위해서는 모든 접근사건들을 감시할 수 있어야 한다. 기존의 경합탐지 기법들은 대상 프로그램을 수정하여 감시하므로 모든 감시지점을 인식하는 것은 현실적으로 어렵다. 본 연구에서는 JDI (Java Debug Interface)를 이용하여 모든 접근사건을 감시하여 선택할 수 있는 투명한 감시도구를 제안한다. 그리고 벤치마크 프로그램을 이용한 실험결과를 분석하여 투명성을 보인다.

• The KIPS Transactions:PartA
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• v.9A no.1
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• pp.129-136
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• 2002

JNI is a linkage method to other languages such as C/C++ which enables the Java to do the platform-dependent specific tasks and also, it can be used to reuse the existing libraries and programs. However, the complex and difficult steps are required to use JNI and it is Inconvenient to manipulate Java source and C/C++ source separately. We design and implement the JPP (Java Preprocessor) that enables the Java source and C/C++ source to handle in a same source file and reduces the required steps so as to use JNI easily.

• Journal of KIISE:Software and Applications
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• v.29 no.7
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• pp.510-520
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• 2002

This paper proposes a transformation-based approach to design constraint-based analyses for Java at a coarser granularity. In this approach, we design a less or equally precise but more efficient version of an original analysis by transforming the original construction rules into new ones. As applications of this rule transformation, we provide two instances of analysis design by rule-transformation. The first one designs a sparse version of class analysis for Java and the second one deals with a sparse exception analysis for Java. Both are designed based on method-level, and the sparse exception analysis is shown to give the same information for every method as the original analysis.

• Journal of Korea Multimedia Society
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• v.2 no.3
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• pp.355-365
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• 1999

In this paper, we present JPAS(Java Package for Array Sharing) which is a Java Package for sharing arrays of data on a cluster of workstations. It allows us to divide an array of data into several pieces, and to place each piece on a different host. JPAS uses Java RMI so that the entire array can be accessed by a location transparent interface which is similar to that of a distributed shared memory system. JPAS is portable and easy to use since it is implemented using pure Java. In order to reduce network overhead, JPAS allows programmers to use their prior knowledge of the application. Data consistency can be maintained through the value updating methods defined for all the elements of an array. We developed parallel programs which use JPAS, and tested them on a cluster of workstations. The test results show that JPAS is a parallel programming tool with reasonably good performance.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.43 no.3 s.309
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• pp.1-9
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• 2006

SNMP is a standard protocol for management of networking devices. Nowadays, most computer systems have capability to act as SNMP agents. In this paper, we developed a low overhead version of SNMP library for embedded systems, and implemented a monitoring software based on the library for a large number of target systems. The monitoring system consists of a monitoring server, SNMP agents, and client programs. The monitoring server collects status information from SNMP agents running on the monitoring targets, and sends summary information to client programs. We implemented two versions of clients, Java based standalone program and Web based program.

• Journal of Korea Multimedia Society
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• v.5 no.3
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• pp.342-350
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• 2002

The execution speed is not an important factor for Java programming language when implementing small size application program which is executed on the web browser, but it becomes a serious limitation when the huge-size programs are implemented. To overcome this problem, the various research is conducted for translating the Bytecode into the target code which can be implemented in the specific processor by using classical compiling methods. In this research, we have designed and realized an intermediate code translator for the native code generation system with which we can directly generate i386 code from Bytecode to improve the execution speed of Java application programs. The intermediate code translator generates the register-based intermediate code from *.class files which are the intermediate code of Java.

• Journal of the Korea Computer Industry Society
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• v.4 no.4
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• pp.633-646
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• 2003

Using the self-contained characteristics of XML, in various areas the XML is widely used to a meta language which can describe information and is recognized to a standard language to present information on the web. In this paper, we point out many difficult problems when we are going to a serial activity of software engineering like that we analyze, reuse, and maintenance source programs. Then we describe whether the existed studies about documentation provide the solutions for the problems above mentioned or not. Finally, we propose the JML(Java Markup Language) that can effectively support solutions about these difficulties. Then we analyze the sample program and present the generated JML docuement using the results. explain the result that The JML is an XML DTD to describe software information written by Java language. Also, we describe the meaning of elements that are parts of whole JML, and explain how to represent the information of Java source codes using each element.