• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.106-108
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• 2001

본 논문에서는 임베디드 자바 가상 대신(Embedded Java Virtual Machine)과 임베디드 실시간 운영체제(Embedded Real-Time Operating System)인 iRTOS$^{TM}$를 통합하기 위한, 설계 및 구현 내용을 기술하고자 한다. 인터넷 가전을 위한 실시간 운영체제 기반의 통합 환경은 각 가정에서 사용하는 정보 가전 제품들을 인터넷에 연결하여 사용함으로써 사용자에게 좀 더 효율적이며. 편리한 서비스를 제공할 수 있다. 또한 어떠한 플랫폼에도 구애 받지 않고 동작 할 수 있는 자바를 실행하기 위한 내장형 JVM 의 추가로, 기존의 플랫폼 의존적인 방법을 벗어나 어떠한 가전 기기상해서도 자바로 개발된 모든 기능들을 동일한 조건으로 동작시킬 수 있다는 장점을 갖는다. 본 논문에서는 통합 설계서의 세부 내용과 통합 방법에 대해 언급하고자 한다.

• Proceedings of the IEEK Conference
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• 2003.11b
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• pp.19-22
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• 2003

Class area is a portion of memory where the constants, fields, and codes of the classes loaded into the Java virtual machine are kept. Knowing the site of the class area is very important especially for embedded Java system with limited memory resources. This paper induces a formula which makes it possible estimate the size of the area. The formula needs some constant values specific to target JVM implementation. We also show that these values can be found using some simple probe classes. An experimental result is included in this paper to confirm the correctness of our approach.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.406-408
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• 2002

자바의 가장 중요한 특성 중 하나는 플랫폼 독립성이다. 즉, 자바가상머신(Java Virtual Machine: JVM)이 탑재된 모든 플랫폼에서 운영체제의 종류와 상관없이 Java로 작성된 프로그램을 수행시킬 수 있다는 것이다. 이를 위해서는 각각의 플랫폼에 맞는 JVM이 적재되어야 한다. 본 논문에서 구현하게 될 가비지 콜렉션은 JVM의 성능을 좌우하는 중요한 요소이다. 가비지 콜렉션을 구현할 때 이용되는 알고리즘에는 여러 가지가 있다. 본 논문은 stop-copy와 마크-회수 알고리즘에 대해서 설명하고, 마크-회수 알고리즘을 개선한 마크-회수 압축 알고리즘을 이용한 가비지 콜렉션의 설계 및 구현한 내용을 기술하고 있다.

• The Journal of Korean Association of Computer Education
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• v.10 no.6
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• pp.39-49
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• 2007

In this paper, a web-based, advanced education system for embedded systems have been implemented, which provide students reality through remote controlled experiment environment when they conduct experiments through web, in addition to the creative multimedia contents. Students can use the server-side remote experiment environment through telnet client using Java technology to conduct a variety of experiments on the embedded system remotely. Our system can be used as economical education tools for expensive experiment equipments in shared fashion through web as well as effective and convenient ones for embedded systems anywhere and anytime when internet access is available, compensating for lack in reality of virtual educations.

• Electronics and Telecommunications Trends
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• v.16 no.2 s.68
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• pp.31-39
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• 2001

최근 휴대 전화 및 인터넷이 대중화 되면서 실생활에서 무선 네트워크 서비스를 이용하는 사용자가 급속히 증가하고 있으며 가전 업체를 중심으로 인터넷 TV, 디지털 백색가전 등과 같은 정보가전 제품들이 개발되고 있다. 이와 같은 내장형 장치들은 기존의 PC와는 다른 제한된 운영 환경을 제공하며, 이를 위한 경량의 Java 플랫폼으로서 EJAE, PJAE, J2ME 등이 등장하였다. 이러한 내장형 Java 플랫폼들은 기존의 Java가 가지고 있던 객체지향성, 분산성, 플랫폼 독립성, 보안성 등과 같은 주요 특징들을 대부분 수용하면서 제한적인 자원 및 연산 능력을 갖는 내장형 장치에 적합하도록 설계되어 있다. 본 논문에서는 내장형 Java 플랫폼의 기술 동향에 대하여 살펴보기로 한다.

• Journal of Korea Society of Digital Industry and Information Management
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• v.7 no.2
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• pp.29-37
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• 2011

Java bytecode verification is a critical process to guarantee the safety of transmitted Java applet on the web or contemporary embedded devices. We propose a design of framework which enables to analyze and verify java bytecode. The designed framework translates from a java bytecode into the intermediate representation which can specify a properties of program without using an operand stack. Using the framework is able to produce automatically error specifications that could be occurred in a program and express specifications annotated in intermediate representation by a user. Furthermore we design a verification condition generator which converts from an intermediate representation to a verification condition, a verification engine which verifies verification conditions from verification condition generator, and a result reporter which displays results of verification.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.42 no.4 s.304
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• pp.11-16
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• 2005

Class area is a portion of memory where the constants, fields, and codes of the classes loaded into the Java virtual machine are kept. Knowing the size of the class area is very important especially for embedded Java system with limited memory resources. This paper induces a formula which makes it possible estimate the size of the area. The formula needs some constant values specific to target JVM implementation. We also show that these values can be found using some simple probe classes. An experimental result is included in this paper to confirm the correctness of our approach.

• The KIPS Transactions:PartA
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• v.9A no.4
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• pp.441-450
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• 2002

As the size of embedded system software increase bigger and bigger, and it's complexity is grower and grower, the usage of dynamic memory management scheme such collector also has been increased. Using the garbage collector, however, inherently lead us performance degradation. In order to resolve this kind of performance problem in the Java based embedded system. we introduce an explicit dynamic memory free method to the automated dynamic memory management environment. which can be performed by a programmer. In the worst case, the prosed scheme shows the same performance as the case of that only garbage collector is working, since the unclaimed garbage objects will eventually be collected later by the garbage collector. In the best case. our method is free from any runtime overhead because the applications can be implemented without any intervention of the garbage collector. Although the proposed method can be facilitated with all the existing garbage collection algorithms, it shows an outperform in the case of mark-and-sweep algorithm.

• Journal of Korea Multimedia Society
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• v.8 no.9
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• pp.1153-1162
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• 2005

In this paper, we developed an XML Document Data Synchronization System for java(XDS4j) based on both SyncML(Synchronization Markup Language) framework Sync4j and embedded database system Berkeley DB XML. Because most existing data synchronization systems are based on file systems, data synchronization times at Fast Sync in those systems are very delayed. In the XDS4j, however, XML documents data produced at SyncML client and SyncML server are managed by embedded database system, and also synchronization time at Fast Sync is reduced because only partial elements are accessed by applying to XPath.

• Journal of Advanced Navigation Technology
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• v.16 no.5
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• pp.839-845
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• 2012

This paper deals with the design and development of the remote control and measurement systems by Embedded Web Server. The remote control and measurement systems are implemented by Cortex M-3 ARM micro-controller. The user application software for the control and measurement system user, and the firmware software of device drivers for peripherals such as a digital input/output device, AD/DAC(Analog to Digital/Digital to Analog Converter), LCD, and temperature/humidity sensor are developed in Eclipse environment using Codesourcery C, Java script, and HTML. The experimental result of the proposed control and measurement systems implemented in this paper is evaluated via real-time experiments, which works well as designed.