• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2004.05b
• /
• pp.199-202
• /
• 2004

In order to efficiently provide the learning ability for engineering education, electromagnetic field simulator have been developed on lava 2 platform. Each simulation module based on lava applet can be easily utilized with independent platform and provide GUI environment to set up physical conditions. The numerical results using computer animation technique are provided in real time. To aggregate and manage the learning objects, application of SCORM which is e-Learning standards is also studied.

• The Transactions of the Korea Information Processing Society
• /
• v.6 no.2
• /
• pp.377-384
• /
• 1999

In this paper, client/server model for remote conveyor control and monitoring system is designed and implemented to simulate the product line of vehicles. The client system located at the monitoring office is using a web applet based system, and sends some commands to the server system which guards and controls the conveyer system directly. And server system is implemented as the web based system by using Java programming language too. The system has a distributed database system environments to manage and maintain the product line of conveyor system.

• Proceedings of the KIEE Conference
• /
• 2003.11c
• /
• pp.750-753
• /
• 2003

In this paper, we have developed the web-based management system for greenhouse teleoperation. The remote control system consists of database, web-server, controller in greenhouse, and clients. The database in the server stores user informations and greenhouse conditions, and is used to manage user login and conditioning data. The management system developed by using Java applet, which is a client program for effective and easy management of greenhouse, monitors the greenhouse in real time. Master and driver boards installed in greenhouse control unit. Database on flowering to collect and analyze data exchanges data with the server. The greenhouse can be managed effectively by timer routine, repeat control within setting time, and algorithm of setting points. Also, the greenhouse conditions can be controlled by manual or remote controller (PC) through web browser in internet. Furthermore, all of the control devices of the greenhouse are managed by remote control using PC and checked via camera installed in greenhouse.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2013.11a
• /
• pp.640-643
• /
• 2013

자바의 가상머신(Virtual Machine)은 보안관리자(Security Manager)를 이용하여 악의적인 목적을 가진 프로그램으로부터 시스템을 보호한다. 하지만 최근에 자바 애플릿(Java Applet)을 통해 자바 API의 취약점을 이용한 시스템 공격 방법들이 공개되면서 자바 보안의 중요성이 높아지고 있다. 본 연구에서는 자바 보안관리자를 우회하는 자바 코드의 작동 원리를 분석하기 위한 기존의 디버깅 환경을 개선하기 위한 방안으로 자바 가상머신에서 사용되는 Core API 의 코드를 수정하고 새로운 API를 추가하였다. 이를 통해 보안 관련 문제로 인한 디버깅의 효율성과 편의성을 높였으며 본 연구가 자바 보안 문제를 해결하는데 기여 할 수 있기를 바란다.

• Journal of Appropriate Technology
• /
• v.7 no.2
• /
• pp.172-187
• /
• 2021

In remote villages without access to modern IT technology, simple devices such as smartcards can be used to carry out business transactions. These devices typically store multiple business applications from multiple vendors. Although devices must prevent malicious or accidental security breaches among the applications, a secure communication channel between two applications from different vendors is often required. In this paper, first, we propose a method of establishing secure communication channels between applications in embedded operating systems that run on multi-applet smart cards. Second, we enforce the high assurance using an intransitive noninterference security policy. Thirdly, we formalize the method through the Z language and create the formal specification of the proposed secure system. Finally, we verify its correctness using Rushby's unwinding theorem.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2020.07a
• /
• pp.613-615
• /
• 2020

As a service application developed for users, we-chat applets can be used without downloading and installation, which realizes the immediate response between offline enterprises and users, and more importantly, it provides users with a convenient platform to find products and improve the cost-effective channel for customers. Therefore, it is beneficial to improve the user experience in the future by studying how to use wechat applets Realize the long-term market competitiveness of enterprises.

• Journal of the Ergonomics Society of Korea
• /
• v.24 no.2
• /
• pp.71-77
• /
• 2005

In spite of the importance of nuclear power as one of major electric energies in Korea, the nuclear safety has become the most serious social issue in the operation of the nuclear power plant. In this paper, a virtual work simulation program was developed to predict exposure dose during radiation work in radwaste storage. The work simulation program was developed. using $Java ^{TM}$applet and VRML-virtual reality modeling language. A numerical algorithm to find the optimal work path which minimize exposure dose during the given work, was developed and exposure dose on the optimal work path was compared with that on the shortest path. Comparing with the shortest path for the given work, the predicted optimal path consumed longer work time by II% but reduced total exposure dose by 46%. The simulation result showed that the exposure dose depended on not only work time, but also the distance between the worker and the radiation source. The developed simulation program could be a useful tool for the planning of radioactive waste work to increase the radiation safety of workers.

• Journal of Institute of Control, Robotics and Systems
• /
• v.11 no.6
• /
• pp.558-563
• /
• 2005

In this paper, we implemented a web-based virtual laboratory system(VLab system) with creative and interactive multimedia contents, which can be used to enhance the quality of education in the area of digital logic circuits. Since the proposed VLab system is implemented to describe the on-campus laboratory, the learners can obtain similar experimental data through it. Also, the VLab system is designed to increase the learning and teaching efficiencies of both the learners and the educators, respectively. The learners will be able to achieve high teaming standard and the educators save their time and labor. The virtual experiments on our VLab system are performed according to the following procedure: (1) Circuit composition on the virtual bread board (2). Applying input voltage (3) Output measurements (4) Checkout of experiment results. Furthermore, the circuit composition on the virtual bread board and its corresponding online schematic diagram are displayed together on the VLab system for the learner's convenience. Finally, we have obtained several affirmative effects such as reducing the total experimental hours and the damage rate for experimental equipments and increasing learning efficiencies as well as faculty productivity.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.9 no.1
• /
• pp.61-66
• /
• 2009

In this paper, an example of implementation of a embedded system technology for web based monitoring and control system is presented. For it interfaces with target board as an embedded system was developed, which was applied to specific green room model and verified of its usefulness. We implemented client/server socket programs using Java classes, and web based green room monitoring and control system as an user interface using JavaApplet. The implemented system did send information of green room model to client programs well on TCP/IP and control signals from client to green room model well too.

• The Journal of Korean Association of Computer Education
• /
• v.11 no.1
• /
• pp.75-83
• /
• 2008

The prior data structure coursewares have been limited to using a simple screen structure with text, pictures or plain animation so that they have been failed to promote favorable interaction between learners and instructors, and unnecessarily charges the screen. In order to overcome these problems, this paper provides an applet-based simulation environment which enables learner to operate and control the data structure operation with their own data, therefore, the learners can actively and positively participate in a study with this courseware. The instructors can easily deliver the education contents to the learners by using web simulation suitable for IT education media. Also, the courseware can offer a class feedback and required data for students estimation by recording a log.