• 산업기술연구
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• 제25권A호
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• pp.175-182
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• 2005

SNMP is a standard protocol for management of networking devices. Nowadays, most computer systems have capability to act as SNMP agents. In this paper, we describe our system monitoring software based on SNMP. It consists of a monitoring server, SNMP agents, and client programs. The monitoring server collects status information from the SNMP agents running on the monitoring target graphical display. We developed two version of clients, Java based standalone program and Web based program. Since most known SNMP packages are too big and heavy, we developed an efficient version of SNMP library for out system monitoring.

• Journal of information and communication convergence engineering
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• 제4권4호
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• pp.166-169
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• 2006

Almost all network systems provide an authentication mechanism based on user ID and password. In such system, it is easy to obtain the user password using a sniffer program with illegal eavesdropping. The one-time password and challenge-response method are useful authentication schemes that protect the user passwords against eavesdropping. In client/server environments, the one-time password scheme using time is especially useful because it solves the synchronization problem. In this paper, we present a new identification scheme: OPI(One Pass Identification). The security of OPI is based on the square root problem, and OPI is secure: against the well known attacks including pre-play attack, off-line dictionary attack and server comprise. A number of pass of OPI is one, and OPI processes the password and does not need the key. We think that OPI is excellent for the consuming time to verify the prover.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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• pp.653-656
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• 2003

We have designed embedded web sewer system and ported Linux operating system version 2.4.5 at our system. And then We implemented to control and monitor widely separated hardware and implemented to monitor widely separated image using CMOS image sensor HV7131B. Web server is the Boa web server with General Public License. We designed for this system using of Intel's SA1110 ARM core base processor and connecting input and output device at GPIO port of SA1110. Device driver of General purpose I/O for Embedded Linux OS is designed. And then the application program controlling driver is implemented to use of common gate interface C language. User is available to control and monitor at client PC. This method have benefit to reduce the Expenditure of hardware design and development time against PC base system and have various and capacious application against firmware base system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 학술회의 논문집 정보 및 제어부문 B
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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.

• 한국멀티미디어학회논문지
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• 제17권6호
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• pp.706-715
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• 2014

It is used to lead to serious structural vulnerability of the system security of security-critical system when we have quickly developed software system according to urgent release schedule without appropriate security planning, management, and assurance processes. The Data Set and Provider of DataSnap, which is a middleware of Delphi XE2 of the Embarcadero Technologies Co., certainly help to develop an easy and fast-paced procedure, but it is difficult to apply security program and vulnerable to control software system security when the connection structure Database-DataSnap server-SQL Connection-SQL Data set-Provider is applied. This is due to that all kinds of information of Provider are exposed on the moment when DataSnap Server Port is sure to malicious attackers. This exposure becomes a window capable of running SQL Command. Thus, it should not be used Data Set and Provider in the DataSnap Server in consideration of all aspects of security management. In this paper, we study on the verification of the security vulnerabilities for Client and Server DataSnap in Dlephi XE2, and we propose a secure coding method to improve security vulnerability in the DataSnap server system.

• 디지털콘텐츠학회 논문지
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• 제8권1호
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• pp.1-8
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• 2007

Mellow Fellow Messenger는 친구추가, 채팅, 쪽지 교환 등의 기본 메신저의 기능 아래 친구 찾기 기능에 중점을 둔 PDA와 PC에서 사용 가능한 메신저이다. 기존에 등록 된 친구 외에도 영화를 같이 볼 수 있는 친구, 편안한 대화를 할 수 있는 친구, 같이 운동을 할 친구 등 사용자들은 자신이 찾고 싶은 조건에 맞는 친구 찾기가 가능하며, 찾은 친구와 쪽지 교환, 대화가 가능하다. 매일 달라지는 기분이나 만나기 원하는 친구의 조건에 부합하는 새로운 친구를 찾는 것이 가능해 지는 것이다. 이를 위하여 서버는 데이터베이스로부터 필요한 사용자의 데이터를 불러들여 조건에 맞는 데이터를 클라이언트에 전송하고, 클라이언트는 이 데이터를 받아 원하는 결과를 출력해준다. 클라이언트-서버 통신은 MFC[1]를 이용하여 구현하였다. 제안하는 메신저는 PC 뿐만 아니라 PDA를 통해서도 사용 가능하여 이동성이 있고 무료 채팅기능을 통하여 문자메시지 대용으로 사용할 수 있다는 장점을 가진다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.946-951
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• 2004

ITIS is applied to the several tunnel construction sites in Korea. Tunnel construction properties which are acquired from these sites are transferred to information management server(SQL 2000 server)by client application program in real time. Access permission to DB server depends on the user's roles. Some functions which cannot be embodied in SQL Server are serviced through XML and GMS server is used for spatial data based on GIS part. This system is supposed to give engineers the advantages which are not only easy handling of the program and computerized documentation on every information during construction but also analyzing the acquired data in order to predict the structure of ground and rock mass to be excavated later and show the guideline of construction. Neung-Dong tunnel and Mu-Gua express way tunnel are now under construction and with this system they have 3D visualized map of the geology and tunnel geometry and accumulate database of construction information such as tunnel face mapping results, special notes and pictures of construction and 3D monitoring data, all matters on the stability of rock bolts and shotcrete, and so on. Ground settlement prediction program included in ITIS, based on the artificial neural network(ANN) and supported by GIS technology is applying to the subway tunnel. This prediction tool can make it possible to visualize the ground settlement according to the excavation procedures by contouring the calculated result on 3D GIS map and to assess the damage of buildings in the vicinity of construction site caused by ground settlement.

• 한국융합학회논문지
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• 제2권4호
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• pp.9-14
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• 2011

피싱(Phishing)은 사용자 또는 기기를 가장하여 사용자 신분을 도용하는 공격이다. 최근 스마트폰 및 메신저 프로그램 보급에 따라 그 피해가 급증하고 있다. 스마트폰은 음성 통화, SMS와 같은 고유 기능 외에 무선네트워크 기반의 다양한 응용 프로그램을 구동할 수 있다. 일반적으로 카카오톡, 네이트온과 같은 메신저 프로그램은 클라이언트-서버 구조로 구성되며 안전한 통신을 위해서 상호 인증이 필수적이다. 본 논문에서는 스마트폰 피싱 공격에 안전한 메신저 인증 프로토콜을 제안한다. 제안한 기법은 사용자들 간의 대화를 보호하기 위하여 메시지 암호화 기능과 인증 기능을 제공한다.

• 한국전자거래학회지
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• 제12권2호
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• pp.1-16
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• 2007

최근에 이동 통신 기술의 발달과 모바일 단말기의 급속한 확산에 맞추어 사용자의 위치정보를 바탕으로 사용자에게 여러 가지 서비스를 제공하는 위치기반 서비스(LBS, Location Based Service)에 대한 연구가 활발하게 진행되고 있다. 모바일 기기를 이용한 이런 서비스 소비과정에서 사용자 주변환경의 변화는 상대적으로 빈번하며 이런 상황의 변화는 서비스의 진행에 직접 혹은 간접적으로 영향을 주게 된다. 지능화된 사용자 중심의 서비스의 실현을 위하여 모바일 디바이스의 컨텍스트를 인식하는 기술과 수집된 컨텍스트를 응용프로그램에 적용하는 방법에 대한 연구가 필요하다. 본 논문에서는 모바일 환경에서 GIS 웹 서비스에 필요한 사용자 컨텍스트 정보의 분류와 구조를 분석하였다. 또한 사용자 디바이스의 컨텍스트 정보를 자동 처리하는 액티브프록시를 제안하였다.

• Journal of Power Electronics
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• 제14권5호
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• pp.1069-1078
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• 2014

This study presents the design and implementation of a web-based remote laboratory for a multi-mode single-leg power converter, which is a topic in advanced power electronics course. The proposed laboratory includes an experimental test rig with a multi-mode single-leg power converter and its driver circuits, a measurement board, a control platform, and a LabVIEW-based user interface program that is operated in the server computer. Given that the proposed web-based remote laboratory is based on client/server architecture, the experimental test rig can be controlled by a client computer with Internet connection and a standard web browser. Although the multi-mode single-leg power converter can work at four different modes (main boost, buck-boost, boost-boost, and battery boost modes), only the buck-boost mode is used in the experiment because of page limit. Users can choose the control structure, control parameters, and reference values, as well as obtain graphical results from the user interface software. Consequently, the feedbacks received from students who conducted remote laboratory studies indicate that the proposed laboratory is a useful tool for both remote and traditional education.