• Proceedings of the Korean Information Science Society Conference
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• 2001.04a
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• pp.469-471
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• 2001

최근 기업이나 조직에서 인터넷의 사용이 보편화되면서 웹을 사용한 기밀유출, 불필요한 웹 사용, 비 업무관련 사이트접속 등의 문제점이 증가하게 되었다. 따라서, 이런 사항들을 감시하여 적절한 조치를 취할 수 있도록 도와주는 웹 사용 현황 모니터링 시스템이 요구된다. 본 논문에서는 패킷 모니터링 기술을 기반으로 웹 사용 네트워크 모니터링 서버와 웹브라우저로 간편하게 모니터링 할 수 있는 클라이언트 애플릿을 설계하고 구현하였다.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.688-690
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• 2001

자바카드 플랫폼은 멀티 어플리케이션 환경이다. 여러 벤더로부터 다중 애플릿은 하나의 카드에 공존할 수 있고 카트 제조사로 부터 추가적인 애플릿이 다운로드 되어진다. 애플릿은 전자 화폐, 지문, 개인 키 값 등과 같은 중요만 정보를 저장하고 애플릿들간에 데이터를 공유하는 경우가 발생하는데 악의를 가진 다른 애플릿으로 데이터가 옮겨질 경우 심각한 결과를 초래할 수 있다. 본 논문에서는 공유 인터페이스를 통하며 애플릿들간의 안전한 데이터 공유와 접근 제한을 고려한 설계방법을 제시하고 이에 관해 논의 해보고자 한다.

• Journal of The Korean Association of Information Education
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• v.8 no.2
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• pp.203-209
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• 2004

The proposed courseware using Java applets and VRML provides the improved learning methods which can enhance the interests of students. To cope with difficulties of science education presents 3 dimensional anmation function using VRML. The courseware helps students to improve understanding of machine easily seen in our life and interest of science education. It can be widely used to improve the efficiency of science education.

• Journal of Institute of Control, Robotics and Systems
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• v.7 no.7
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• pp.632-639
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• 2001

This paper proposes an improved architecture of web-based monitoring systems for monitor of processes in plants from the soft real-time point of view. The suggested model is designed to be able to guarantee the temporal and spatial consistency and transmit the monitoring data periodically via the intranet and the Internet. The model generates one thread for monitoring management, one DB thread, one common memory, and corresponding monitoring threads to clients. The monitoring thread is executed during the smaller time than the execution time of the process used in the conventional methods such as CGI and servlet method. The Java API for the server API, VRML, EAI(External Authoring Interface) and Java Applets for efficient dimensional WEB monitoring are used. The proposed model is implemented and tested for a FMS plant, Some examples show that the proposed model is useful one.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.2
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• pp.146-157
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• 2003

Our experience with Internet-based scientific collaboratories indicates that they need to be user-extensible, allow users to add tools and objects dynamically to workspaces, per mit users to move work dynamically between private and shared workspaces, and be easily accessible on the Internet. We present the software architecture of a development environment, called Collaboratory Builder's Environment(CBE), for building collaboratories to meet such needs. CBE provides user extensibility by allowing a collaboratory to be constructed as a collection of collaborative applets. To support dynamic reconfiguration of shared workspaces, CBE uses the metaphor of room that can contain applets, users, and arbitrary data objects. Rooms can be used not only for synchronous collaboration but also for asynchronous collaboration by supporting persistence. For the access over the Internet room participants are given different roles with appropriate access rights. A prototype of the model has been implemented in Java and can be run from a Java-enabled Web browser. The implemented system had been used by 95 users including 79 space scientists around the world in a scientific campaign that ran for 4 days. The usage evaluation of the campaign is also presented.

• Journal of Intelligence and Information Systems
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• v.6 no.1
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• pp.1-16
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• 2000

This paper analyzes the approaches of Web-based expert systems by comparing their pros and cons. and proposes a methodology of implementing the Web-based backward inference engines with reduced burden to Web servers. There are several alternatives to implement expert systems under the WWW environment : CGI, Web servers embedding inference engines external viewers Java Applets and HTML. Each of the alternatives have advantages and disadvantages of each own in terms of development and deployment testing scalability portability maintenance and mass service. Especially inference engines implemented using HTML possess relatively large number of advantages compared with those implemented using other techniques. This paper explains the methodology to present rules and variables for backward inference by HTML and JavaScript and suggests a framework for design and development of HTML-based Expert System. A methodology to convert a traditional rule base to an Experts Diagram and then generate a new HTML-based Expert System from the Experts Diagram is also addressed.

• Journal of the Korea Computer Graphics Society
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• v.2 no.2
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• pp.69-74
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• 1996

With the emergence of integrated global market and increased competition, many companies are interested in sharing the product model data. One of the solutions is to share the product model data over the computer network or the internet using a standard format. CAD/CAM, STEP, and internet technologies make it possible to share the product model data. This paper presents methods to visualize 3D STEP geometry data on the internet. To create an internet-based STEP model visualizer, the programming language Java and 3D scene description language VRML have been experimented. The STEP geometry data can be displayed either by Java applets of by a VRML browser. These visualization technologies are applied to a PDM development. Engineers who have a low cost web browser can share the expensive design information even at a remote site.

• The Journal of Korean Association of Computer Education
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• v.10 no.3
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• pp.39-48
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• 2007

Due to the rapid proliferation of the web in recent years, many educators seek to improve the effectiveness of their instruction by providing innovative web-based course material to their students. Lots of web-based education contents are developed especially. They help to teach and train students. They expand widely due to repetition learning any time, any where. In this paper we implemented usage of C functions, quizes for checking comprehension of statements in C programming lecture and developed scenario helping concepts, algorithm comprehension. We made them web-based visual representation. They were implemented as FLASH animations or Java applets. They were well received by students.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.1794-1797
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• 2003

We developed a web-based virtual laboratory system for electronic circuit experiments on the client/ server distributed environment. Through our virtual laboratory, the learners will be capable of learning the concepts and theories related to electronic circuit experiments and how to operate the experimental equipments such as multimeters, function generators, digital oscilloscopes and DC power suppliers. The proposed virtual laboratory system is composed of four important components: Principle Classroom to explain the concepts and theories of electronic circuit operations, Virtual Experiment Classroom to provide interactive multimedia contents about the syllabus of off-line laboratory class, Assessment Classroom, and Management System. With the aid of the Management System every classroom is organically tied together collaborating to achieve maximum learning efficiency. We have obtained several affirmative effects such as high learning standard, reducing the total experimental hours and the damage rate for experimental equipments.

• Proceedings of the Korea Association of Information Systems Conference
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• 2000.05a
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• pp.171-175
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• 2000

The firewall is normally an intermediate system between the secure internal networks and the less secure external networks. It is intended to keep corporate systems safe from intruders, hackers, and accidental entry into the corporate system. The primary types of firewalls are screening routers, proxy servers, and stateful inspectors. Encryption is another form of firewall protection which is being incorporated along with other firewall methods. Before choosing a firewall architecture, a company must have the right mind set about the threat. The future will see more integration of firewall technologies and the increased use of standards in the industry. It must also determine what are the possible consequences of a breach in security and then develop a system to counter the threat. Additionally, new firewall technologies will address the potential dangers associated with the use of Java applets and Active X-controls on the Internet.