• Journal of Korea Game Society
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• v.1 no.1
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• pp.31-36
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• 2001

Generally, the internet online game systems are divided into two parts, clients and servers. The clients provide a connection with game server to each user and communicate between them. And, the server controls all clients by the game rules fairly and manages database systems to maintain the user information. In this paper, we propose a configuration method for internet online game servers using distributed scheme. To apply this method, we divide game server into three sub-level parts again. First part of game server is login server to establish the connection between communication server and clients. Second part is communication server to connect between clients and main game server during playing the game. And last part is DBMS that performs database independently. Our proposed scheme suggests that the game server operates very stable because of decreasing of processing load by distributed scheme. So, our proposed server configuration applies to similar online game easily.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.667-670
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• 2002

인터넷 서비스의 확대에 따라 사용자는 많은 웹사이트에 접근해 자원을 활용하게 되었고, 이와 함께 인터넷 보안에 대한 인식도 커지게 되었다. 본 논문에서는 보안 서비스 중 사용자 인증에 대해 연구하였다. 사용자는 시스템 자원을 활용하기 위해서 시스템으로부터 사용 권한을 획득해야 한다. 시스템 사용 권한을 획득하기 위해서 사용자는 ID, 패스워드 등의 사용자 정보를 시스템에 제공해야 한다. 사용자가 시스템 사용 권한을 획득하면, 사용자는 ID와 패스워드를 이용해서 시스템을 이용할 수 있다. 그러나 현재 숫자나 문자로 이루어진 패스워드 입력 값은 인증 받지 않은 사용자에게 도용될 가능성이 높다. 따라서 본 논문에서는 숫자, 문자로 이루어진 패스워드에 입력키의 시간 값을 적용해서 패스워드를 암호화하는 방법에 대해 제시한다.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2002.10a
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• pp.241-249
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• 2002

In this paper, a self-organizing fuzzy controller(SOFC) for the industrial robot manipulator with a actuator located at the base is studied. A fuzzy login composed of linguistic conditional statements is employed by defining the relations of input-output variable of the controller, In the synthesis of a FLC, one of the most difficult problems is the determination of linguistic control rules from the human operators. To overcome this difficult SOFC is proposed for a hierarchical control structure consisting of basic level and high level that modify control rules. The proposed SOFC scheme is simple in structure, fast in computation, and suitable for implementation of real-time control. Performance of the SOFC is illustrated by simulation and experimental results for robot with tow joints.

• The Transactions of the Korean Institute of Electrical Engineers D
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• v.50 no.1
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• pp.45-50
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• 2001

With increasing complexity of digital logic circuits, fast and accurate verification of functional behaviour becomes most critical bottleneck in meeting time-to-market requirement. This paper presents several techniques for accelerating a cycle-based logic simulation. The acceleration techniques include parallel pattern logic evaluation, circuit size reduction, and the partition of feedback loops in sequential circuits. Among all, the circuit size reduction plays a critical role in maximizing logic simulation speedup by reducing 50% of entire circuit nodes on the average. These techniques are incorporated into a levelized table-driven logic simulation system rather than a compiled-code simulation algorithm. Finally, experimental results are given to demonstrate the effectiveness of the proposed acceleration techniques. Experimental results show more than 27 times performance improvement over single pattern levelized logic simulation.

• Journal of Korea Society of Digital Industry and Information Management
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• v.14 no.2
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• pp.27-33
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• 2018

User authentication scheme is a method for controlling unauthorized users' access to securely share the services and resources provided by the server and for verifying users with access rights. Initial user authentication scheme was based on passwords. Nowadays, various authentication schemes such as ID based, smart-card based, and attribute based are being researched. The study of Lee et al. suggested a user authentication scheme that provides forward secrecy and protects anonymity of users. However, it is vulnerable to attacks by outsiders and attackers who have acquired smart-cards. In this paper, we propose a modified smart-card authentication scheme to complement the weakness of the previous studies. The proposed user authentication scheme provides the security for the ID guessing attack and the password guessing attacks of the attacker who obtained the login request message and the user's smart-card.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.711-712
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• 2014

국가R&D사업을 수행하는 17 개 부처 청과 연계를 통해 국가R&D정보를 종합 서비스하는 국가과학기술지식정보서비스(NTIS)는 과학기술분야 정부3.0 실현을 위해 범부처 과제신청 원스톱서비스를 구축중이다. NTIS를 통해 한 곳에서 R&D 과제공고 확인부터 과제신청까지 가능한 통합 창구를 제공함으로써 연구자 친화적인 연구개발 환경 조성이 목적이다. 법부처 과제신청 원스톱서비스와 부처 전문기관 연구과제관리시스템 간 로그인 연동을 위해 도출되었던 이슈와 해결방안을 공유하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04b
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• pp.1123-1126
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• 2002

현대사회를 살아가는 사람들은 웹 상에서 회원가입을 한 사이트가 한 두 개가 아니고 수 십개씩 가입하고 있다고 생각한다. 그런데 이 많은 사이트에 대한 아이디와 암호를 기억하기란 어렵다. 수첩에 아이디와 암호를 적어서 필요시마다 사이트 찾아가서 아이디와 암호를 입력하고 접속하고 있는 사용자가 있는데 만일 수첩을 잊어버리면 바로 개인보안에 문제가 생길 수 있다. 이러한 불편함을 없애기 위해 사용자가 계정과 함께 암호를 기억하지 않아도 바로 웹에서 원 클릭으로 사용자가 원하는 사이트에 바로 연결하여 login 할 수 있도록 처리 한다.

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

• International Journal of Internet, Broadcasting and Communication
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• v.15 no.3
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• pp.203-210
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• 2023

In this paper, we develope a stock trading system that automatically buy and sell stocks in Kiwoom Securities' HTS system. The system is made by using Kiwoom Open API+ with the Python programming language. A trading strategy is based on an enhanced system query method called a Condition-Search. The Condition-Search script is edited in Kiwoom Hero 4 HTS and the script is stored in the Kiwoom server. The Condition-Search script has the advantage of being easy to change the trading strategy because it can be modified and changed as needed. In the HTS system, up to ten Condition-Search scripts are supported, so it is possible to apply various trading methods. But there are some restrictions on transactions and Condition-Search in Kiwoom Open API+. To avoid one problem that has transaction number and frequency are restricted, a method of adjusting the time interval between transactions is applied and the other problem that do not support a threading technique is solved by an IPC(Inter-Process Communication) with multiple login IDs.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.205-206
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• 2021

본 논문에서는 스마트 폰의 GPS 센서와 Google Map, 공공데이터를 활용해 사용자 주변의 최저가 업소를 맵에 표기하는 애플리케이션을 개발한다. 이 애플리케이션은 휴대폰 인증을 통한 회원가입 기능을 구현하였으며 안드로이드 GPS 센서를 이용하여 현재 사용자의 위치 주변의 최저가 업소들을 표기한다. 또한 사용자가 검색하고자 하는 업소의 업종을 선택하면 맵에 선택한 업종과 같은 업소들의 위치에 마커를 표시하고 마커를 클릭 시 업소명, 대표메뉴, 가격 등의 정보를 볼 수 있다.