• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2003년도 추계학술대회 및 정기총회
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• pp.59-65
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• 2003

In order to reduce the cost of software maintenance including software modification, we suggest the object oriented program with checking the version of application program using the Java language and the technique of executing the downloaded application program via network using the application manager. In order to change the traditional scheduler to the application manager we have adopted the Xlet concept in the nuclear fields using the network. In usual Xlet means a Java application that runs on the digital television receiver. The Java TV Application Program Interface(API) defines an application model called the Xlet application lifecycle. Java applications that use this lifecycle model are called Xlets. The Xlet application lifecycle is compatible with the existing application environment and virtual machine technology. The Xlet application lifecycle model defines the dialog(protocol) between an Xlet and its environment

• 한국멀티미디어학회논문지
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• 제8권12호
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• pp.1658-1668
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• 2005

This paper presents the bytecode-to-SIL translator which enables the execution of the java program in EVM(Embedded Virtual Machine) environment without JVM(java Virtual Machine), translating bytecodes produced by compiling java programs into SIL(Standard Intermediate Language) codes. EVM, what we are now developing, is a virtual machine solution that can download and execute dynamic application programs written in sequential languages like C language as well as object oriented languages such as C#, Java, etc. EVM is a virtual machine mounted on embedded systems such as mobile device, set-top box, or digital TV, and converts the application program into SIL, an assembly language symbolic form, and execute it. SIL is a virtual machine code for embedded systems, based on the analysis of existing virtual machine codes such as bytecode, MSIL, etc. SIL has such features as to accommodate various programming languages, and in particularly has an operation code set to accept both object-oriented languages and sequential languages. After compiling, a program written in java language is converted to bytecode, and also executed by JVM platform but not in other platform such as .NET, EVM platform. For this reason, we designed and implemented the bytecode-to-SIL translator system for programs written in java language to be executed in the EVM platform without JVM. This work improves the execution speed of programs, enhances the productivity, and provides an environment for programmers to execute application programs at various platforms.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 학술대회
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• pp.290-296
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• 2008

In this paper development of on-line data visualization program is described and some examples of data postprocessing are shown. The program is written in JAVA language and runs as a JAVA applet on the web browser such as Internet Explorer or Firefox. Remote users can use the program to visualize and analyze their own flow data by accessing the program server through the internet and loading data files in proper formats from their local computers. This paper describes briefly about algorithms for data visualization, structure and available functions of the program, and web sever system. The mechanism of how the JAVA applet can access and process local data files and relevant coding techniques are explained as well. Also explained is what is required for the remote users and client computers to access the program on-line. Some visualization examples performed on a local computer are illustrated by accessing the server remotely.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년 추계학술대회논문집
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• pp.290-296
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• 2008

In this paper development of on-line data visualization program is described and some examples of data postprocessing are shown. The program is written in JAVA language and runs as a JAVA applet on the web browser such as Internet Explorer or Firefox. Remote users can use the program to visualize and analyze their own flow data by accessing the program server through the internet and loading data files in proper formats from their local computers. This paper describes briefly about algorithms for data visualization, structure and available functions of the program, and web sever system. The mechanism of how the JAVA applet can access and process local data files and relevant coding techniques are explained as well. Also explained is what is required for the remote users and client computers to access the program on-line. Some visualization examples performed on a local computer are illustrated by accessing the server remotely.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2010년 춘계학술대회논문집
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• pp.335-340
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• 2010

In this paper development of an automatic grid generation program for flow field calculation around 3D wing is described and its application is also introduced. The program is developed by using JAVA programming language and a graphic library, JOGL, and it can be usee either as an application program on a local computer or as a applet in the network environment. Currently, The program provides NACA series 4-digit airfoils as the wing cross-section shape and it offers a non-complicated GUI program which can easily generate structured grids for wings based on user's parameter input. Grid generated by the program can be selected as one of two types; O-type and C-type. In this research advancing layer method(ALM) augmented by elliptic smoothing method is used for the FLUENT. It is shown that by using current program high-quality structured grids around 3D wings can be easily generated, and typical grid generation results and flow solutions are demonstrated. Study on effects of geometric parameters on flow field is also tried by changing major wing parameters such as incidence angle type of wing-tip and sweepback angle.

• 한국멀티미디어학회논문지
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• 제10권9호
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• pp.1197-1208
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• 2007

오늘날 대부분의 스마트카드는 자바카드 플랫폼을 채택한 자바카트가 표준안으로 자리매김 하고 있다. 자바카드 기술은 이식성, 플랫폼 독립성, 높은 보안성 기능을 스마트카드에 제공한다. 그러나 자바카드는 일반 스마트카드에 비해 자바 언어 상의 특성으로 인해 실행속도 저하의 단점을 갖고 있다. 실행속도에 영향을 끼치는 요소는 자바 카드가 데이터를 저장하는 방식과 자바카드 설치기가 애플릿을 설치하는 방식 때문이다. 본 논문에서는 자바카드 프로그램의 적재와 실행의 속도를 개선시키기 위한 방안으로 자바카드에서 EEPROM에 데이터에 대한 저장, 갱신, 삭제하는 과정들을 처리 속도가 빠른 RAM을 이용하여 자바카드의 속도를 개선할 수 있다. 이를 위해 자바카드에서 RAM을 활용한 방법으로 자바카드 환경에 맞는 선반입 LRU-OBL 버퍼 캐쉬 기법을 제시한다. 자바카드에서 생성되는 모든 데이터들을 데이터 특성에 따라 버퍼 캐쉬에서 관리함으로써 EEPROM에 대한 기록 횟수를 최대한 줄여 자바카드의 프로그램 적재 및 실행속도를 향상시킨다.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제7권2호
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• pp.151-164
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• 2001

최근 가장 대표적인 객체지향 언어로 사용되는 Java는 일반적인 애플리케이션뿐만 아니라 인터넷/인트라넷 기반 프로그램 개발, 나아가 컴포넌트 기반 개발에 이르기까지 다양한 분야에서 개발 언어로 사용되고 있다. 따라서 개발된 프로그램의 재사용 및 유지보수 관점에서 프로그램 품잘평가는 보다 중요한 쟁점이 되고 있으므로 기존의 Java 애플리케이션을 포함하여 현재 개발된 프로그램의 품질평가에 필요한 메트릭 측정이 필요하다. 하지만, 이미 제안된 객체지향 소프트에어 메트릭이 현재의 Java 프로그램의 특성에 적합한지에 대한 타당성 검증이 필요하므로 본 논문에서는 기존의 객체지향 메트릭이 Java 프로그램에 적합한지 여부를 결정하기 위해 필요한 메트릭 측정 시스템을 구축하여 Java 프로그램에 적합한 메트릭 제안을 지원하고자 한다. 본 시스템은 Briand가 기존의 객체지향 소프트웨어 메트릭을 수학적으로 정형화시켜 분류한 메트릭을 Java 프로그램에 적용시켜 제안된 메트릭이 프로그램에 타당성 있는지 검증함으써 명확한 품질평가도구 개발을 지원하고자 한다. 본 시스템을 통해 Java 소스 프로그램으로부터 정량적 정보를 보다 빠르고 정확하게 산출함으로써 기존의 객체지향 메트릭에 대한 검증을 비교 및 분석 수행할 수 있으며, 타당성 문제가 있다면 새로운 메트릭의 제안 및 보완을 고려함으로써 Java 프로그램에 적합한 메트릭 확립을 가능하게 할 것이다.

• 한국멀티미디어학회논문지
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• 제7권6호
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• pp.824-831
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• 2004

This paper presents the java bytecode-to-.NET MSIL intermediate language translator which enables the execution of the java program in .NET environments without JVM(java Virtual Machine), translating bytecodes produced by compiling java programs into MSIL codes. Java, one of the most widely used programming languages recently, is the language invented by James Gosling at Sun Microsystems, which is the next generation language independent of operating systems and hardware platforms. Java source code is compiled into bytecode as intermediate code independent of each platform by compiler, and also executed by JVM. .NET language such as C# and .NET platform in Microsoft Corp. has been developed to meet the needs of programmers, and cope with Java and JVM platform of Sun Microsystems. After compiling, a program written in .NET language is converted to MSIL code, and also executed by .NET platform but not in JVM platform. For this reason, we designed and implemented the java bytecode-to-.NET MSIL translator system for programs written in java language to be executed in the. NET platform without JVM. This work improves the execution speed of programs, enhances the productivity, and provides a environment for programmers to develop application programs without limitations of programming languages.

• 한국정보전자통신기술학회논문지
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• 제11권1호
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• pp.26-33
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• 2018

A web application running on the Internet is causing many difficulties for a program developer, and it requires to process multiple sessions at the same time due to the occurrence of excessive traffic. Web applications should be able to process concurrent requests efficiently and in real time. Node.js is a single-threaded server-side JavaScript environment implemented in C and C ++ as one of the latest frameworks to implement event models across the entire stack. Nodes implement JavaScript quickly and robust to achieve the best performance using a JavaScript V8 engine developed by Google. In this paper, it will be explained the operation principle of Node.js, which is a lightweight real-time web server that can be implemented in JavaScript for real-time responsive web applications. In addition, this application was practically implemented through automatic alignment system for group scheduling to demonstrate event-based real-time response web processing.

• 한국산업정보학회논문지
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• 제6권2호
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• pp.54-62
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• 2001

본 논문에서는 웹 상에서 멀티미디어를 기반으로 한 문제은행 시스템을 제안하였다. 제안된 문제 은행 시스템은 객체-관계(Object-Relation)형 모델로 데이터베이스를 설계하고, 웹 환경에서 다수 클라이언트에 대한 무결성을 위해 독립적 실행이 되도록 Java 언어로 응용프로그램을 구현하였다. 문제 엔티티들은 객체로 정의하고, 이들간의 관계를 사용자 정의유형과 타입으로 설계 구현하였으며, DBMS의 스키마 객체와 JAVA Class를 매핑하여 DBMS와 어플리케이션 서버간에 체계화된 동작으로 객체를 전달할 수 있도록 하였다.