• Journal of the Korea Computer Industry Society
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• v.2 no.3
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• pp.407-416
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• 2001

In this paper we propose a suite of metrics $\pi_{java}$ Java/, for evaluating the complexity of Java Programs based on a suite of metrics $\pi_{java}$ c++/, which we previously presented for C++ programs. So far, a lot of metrics for C++ are proposed for C++ programs. But since the specific properties of Java programs are not explicitly considered in those metrics, it is hard to apply them to Java programs. Thus we aim to develop a metric suite that is applicable to Java Programs. At first, we decide if any properties are commonly possessed by both C++ programs and Java programs, or not. For example, the multiple inheritance of the class in C++ is not implemented in Java. On the other hand, the features such as package and interface are newly implemented in Java, and therefore we cannot discuss the complexity of Java programs without considering these new features. Then we define a new suite of metrics $\pi_{java}$ Java/ for Java programs by deleting 3 metrics $\pi_{java}$/c++/, and then incorporating 3 metrics which are newly defined or modified for Java programs to $\pi_{java}$ c++/. Finally, we analytically evaluate the new metric with regard to Weyuker's measurement principles and also compare it with conventional metrics for Java.

• Journal of Korea Multimedia Society
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• v.5 no.2
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• pp.222-230
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• 2002

Various virtual reality methods are examined on the internet. In this paper, 3D implementations on the internet are discussed using Java3D and GL4Java which are based on the Java. 3D shoppingmall, real time 3D renderings, and various objects are implemented using Java3D and GL4Java, respectively. Especially with Java3D, the file formats of VRML97, OBJ, and 3DS are implemented using Java3D loader, which shows that object implementation in Java3D is better than other methods. Also, the comparisons between Java3D and GL4Java are discussed.

• Convergence Security Journal
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• v.8 no.1
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• pp.57-65
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• 2008

The implement of JAVA API for supporting the embedded system is capable of developing the object oriented system with code reuse because the developer is able to use JAVA in the embedded system. The system dependant parts for implementing JAVA API are realized from a native function. In this paper, we devide JAVA API into the platform-independent JAVA part and platform-dependent native part for the implementation of JAVA API to manage the linux based embedded system devices, and focus on the control of the embedded system devices using JAVA API.

• Journal of Information Management
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• v.29 no.3
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• pp.1-26
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• 1998

The loop is a fundamental for the parallelism exploiting as it has a large portion of execution time for sequential Java program on the parallel machine. This paper proposes the method of exploiting the implicit parallelism through the analysis of data dependence in the existing Java programming language having a single loop structure. The parallel code generation method through the restructuring compiler and the translation method of Java source program into multithread statement, which is supported in the level of the Java programming language, are also proposed here. The performance test of the program translated into the thread statement is conducted using the trip count of loop and the thread count as parameters. The restructuring compiler makes it possible for users to reduce overhead and exploit parallelism efficiently in the Java programming.

• Journal of Korea Multimedia Society
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• v.1 no.2
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• pp.142-153
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• 1998

In this paper, Java Method approach for the integration of Web and Object-Relational DBMS is proposed. For the purpose, we extend to use Java language in programming user-defined function which is one of important characteristic of Object-Relational DBMS with object concept. Therefore we can retrieve not only database objects but also their associated Java methods to run in clients. Finally, to demonstrate the feasibility of the proposed Java Method technique, we designed and implemented this Java method system based on three-tier client/server architecture using JDBC(Java Database Connectivity) and Java RMI(Remote Method Invocation).

• Proceedings of the Korean Information Science Society Conference
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• pp.320-322
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• 2000

인터넷의 빠른 발전과 하드웨어 속도의 향상에 의해 가상현실이 점차 일반 사용자에게도 가깝게 다가서고 있다. 인터넷 가상현실 언어의 표준인 VRML이 XML의 개발과 발전에 의해 차기 버전을 XML의 장점인 용이한 확장성을 수용하는 X3D라 명명하고 표준화를 진행 중이다. 강력한 Java 3D API와 플랫폼 독립적인 바이트코드의 장점을 살려 표준화 단계인 X3D를 별도의 브라우저 없이도 Java 애플릿을 이용하여 재생할 수 있도록 하고자 하며 또한 앞으로 개발될 X3D 저작도구의 결과물을 Java 3D로 변환하여 Java 3D로 변환하여 Java 3D에 의한 3차원 영상 제작을 손쉽게 구현할 수 있도록 한다. 이를 위한 방법으로 X3D를 Java 3D로 변환하는 번역기가 필요하다. 따라서 본 논문에서는 X3D-Java 3D 번역기의 구조를 설계하고 구현 방법을 제시하고자 한다. XML 파서를 이용하여 X3D를 파싱하고 그의 출력인 AST를 순회하면서 Java 3D 파일을 생성한다. X3D DTD와 Java 3D 클래스의 구조 정보를 독립된 자료로 처리하여 계속 변하게 될 두 언어의 변화에 유동적으로 대처하면서 구현 방법의 큰 변화없이 이용할 수 있게 설계하고자 한다.

• Journal of Korea Multimedia Society
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• v.10 no.9
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• pp.1197-1208
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• 2007

These days, most of SMART card, JAVA card, picked up the JAVA Card Platform gets the position as a standard. Java Card technology provides implantation, platform portability and high security function to SMART Card. Compared to normal Smart Card, JAVA card has a defect that is a low running speed caused by a distinctive feature of JAVA programming language. Factors that affect JAVA Card execution speed are the method how to save the data and install the applets of JAVA Card installation instrument. In this paper, I will offer the plan to improve JAVA Card program's loading and execution speed. At Java Card program, writing, updating and deleting process for data at EEPROM can be improved of Java Card speed by using high speed RAM. For this, at JAVA Card as a application of RAM, I will present prefetching LRU-ORL Buffer Cache Technique that is suitable for Java Card environment. As a data character, managing all data created from JAVA Curd at Buffer Cache, decrease times of recording at maximum for EEPROM so that JAVA Card program upload and execution speed will be improved.

• Proceedings of the Korean Society of Computer Information Conference
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• pp.297-300
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• 2008

임베디드 시스템을 지원하는 JAVA API를 개발하면 임베디드 시스템을 개발자가 JAVA를 사용하므로써 코드의 재사용, 객체지향 개념의 시스템 개발들을 가능하게 한다. JAVA API를 구현하는데 있어 시스템에 의존적인 부분들이 존재하게 되는데, 이는 native 함수에서 구현한다. 본 논문에서는 리눅스 기반의 임베디드 시스템 디바이스를 제어하기 위한 JAVA API를 구현하는데 있어 플랫폼 독립적인 자바 부분과 의존적인 native 부분으로 나누어 설계 및 구현하였고, 임베디스 시스템 디바이스의 JAVA API를 통한 제어에 초점을 두었다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.12 no.3
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• pp.15-22
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• 2002

Java applet, executed in user's web browsers which is via proxy server on web sever, can approach client files or resources, so it is necessary to secure against malicious java applet. Currently, the previous security countermeasures against malicious java applet use two ways: one is making a filter system to detect malicious java applet hewn in proxy, the other is that establishes another security java virtual machine. However, the first one can not detect unknown malicious java applet, and the other one nay increase loads, because it decides whether there is malicious or not after implementing java applet on proxy server. In this paper, after inserting monitoring function to java applet on proxy server using java-methods substitution and transfer it to user to detect malicious java applet, we propose a technique for detecting malicious java applet that can detect the unknown malicious java applet with reducing loads

• Journal of Korea Multimedia Society
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• v.5 no.2
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• pp.231-238
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• 2002

As electronic commerce is becoming more popular on the Internet, smart cards have been used for safe transfers and transactions on I-commerce popularly. Especially, Java Card considered as a COS for the next generation must take advantage of the good points of Java Language by using this language and making programs asked for by various demands. In this paper, we proposed efficient management system of mileage on the Internet using Java Card. The system has security for data and the simplicity of application development by Java Card cryptography. The system is an independent program saved un Java Card and can calculate and save mileage, although the characteristic of the mileage is different from others through the calculating Process of the Card. Also, the system is developed to encourage the efficiency of a system after comparing and contrasting between established systems and the newly designed one in simulation.