• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.10b
• /
• pp.961-964
• /
• 2001

인증시스템은 보안운영체제시스템을 구성하기 위한 중요한 서브시스템 중의 하나이다. 본 논문에서는 사용자가 시스템에 접근하기 위해서 가장 먼저 거치게 되는 인증 절차 수행에 있어서 허가된 사용자의 접근만을 허용하고, 인증요청 메시지의 진위 여부를 확인시켜주는 기능과 사용자가 입력하는 중요 정보가 다른 사용자에게 유출되지 않도록 보장하는 기능을 추가한 다 단계 사용자 인증방법을 소개한다. 본 논문에서는 역할기반의 접근제어 시스템을 커널 내부에 구성하고, 사용자인증에 비밀번호와 하드웨어 장치인 스마트카드를 사용함으로써 강화된 사용자 인증 시스템을 구현하였다.

• Proceedings of the KIEE Conference
• /
• 2001.05a
• /
• pp.266-269
• /
• 2001

컴퓨터 기술과 통신. 네트워크 기술의 발달로 전력설비의 보호방식은 단순한 보호 기능 외에 전체 시스템을 자동으로 보호. 제어하는 추세로 발전하게 되었다. 이러한 새로운 보호개념을 구축하기 위해서는 디지털형 보호계전기와 이를 네트워크로 엮는 통신 기술, 데이터를 취득 가공. 관리하는 데이터 처리 기술이 필수적이다. 본 논문에서는 변전소 자동화 시스템에 필수적인 디지털 보호계전기의 개발 사례와 변전소 자동화 시스템의 네트워크 구성 및 데이터처리 방법을 소개하고 있다.

• Proceedings of the KIEE Conference
• /
• 2003.07d
• /
• pp.2055-2057
• /
• 2003

This paper describes the results of RBD(Reliability Block Diagram) analysis of control rod control system, which is being developed as part of KNICS project. The results of RBD indicate unavailability of control cabinet for control rod control system. A purpose of RBB is to evaluate unavailability of control cabinet, identify the design drawbacks of control cabinet, and propose design improvement to a designer to help design the more reliable control rod control system. This RBD defines the logical interaction of failure within a system.

• Proceedings of the KSRS Conference
• /
• 2003.11a
• /
• pp.396-398
• /
• 2003

Recently as users' requests for geographic information systems are being more various, several new functions are being added to existing geographic information systems. One of them is linkage of spatial geographic data and video / image data to offer more realistic information of geographic objects to users. Geographic information systems implementing this function are called video geographic information system. In this paper, we design and implement a video geographic information system for providing map data, video data and link information of them to web applications. We 1) design system architecture of a video geographic information system, 2) analyze some processes to construct link information of map data and video data, 3) design database schema to store map data, video data, and link information, and 4) design some XML/GML schema used to query and retrieve these data for web applications.

• Proceedings of the KSRS Conference
• /
• 2003.11a
• /
• pp.343-345
• /
• 2003

This paper describes the system development for the Ground Control Point collection and management through the major coastline region in KOREA, which will collect and manage the ground control point based on high resolution satellite image database. The module of this system is following 1) GCP/Coarstline research plan module 2) GCP/Coarstline ground collection module 3) GCP/Coarstline post processing module Our team developed the core components of ‘High Resolution Satellite Image Processing Technique’ project, and this system, among applications of our project, is constructed to apply to practical use. In this application, you will also see how to apply core components of our project.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2001.04a
• /
• pp.573-576
• /
• 2001

본 논문은 한국전자통신연구원에서 개발하고 있는 HANbit ACE2000 교환기 기반 MPLS 시스템의 장애처리 기능의 구현 내용을 설명한다. 본 시스템의 장애처리는 장애검출(Fault Detection), 장애격리(Fault isolation), 장애진단(Fault Diagnose), 장애복구(Fault Recovery)와 같은 일련의 과정을 통하여 수행된다. 본 장애처리 기능의 특징은 장애발생시 시스템의 영향을 최소화하여 최대한 서비스의 연속성을 유지할 수 있도록 설계되었다.

• The Journal of Society for e-Business Studies
• /
• v.15 no.2
• /
• pp.137-166
• /
• 2010

A virtual team is defined a group of people that use electronic communications for some or all of their interactions with other team members. Because team members of a virtual team are physically and temporally distributed, a team's transactive memory system(TMS) is considered to be crucial for the team's effectiveness and performance. TMS refers to a set of individual memory systems which integrate knowledge possessed by particular members through a shared awareness of who knows what. This paper seeks to understand (1) how a virtual team's TMS influences team performance, and (2) what factors contribute to developing the team's TMS. Given these purposes, through the extensive literature review, we first identified components and antecedents to develop a theoretical model that predicts a virtual team's performance. Using the survey data gathered from 172 virtual teams, this study found that expertise location, coordination, and cognition-based trust which were proposed as three components of TMS positively influenced a virtual team's performance. Furthermore, this study uncovered that perceived media richness, network tie strength, and shared norms significantly influenced the components of TMS, while geographical dispersion did not exert any significant influence on TMS.

• Journal of the Korean Society of Safety
• /
• v.11 no.2
• /
• pp.150-159
• /
• 1996

In this paper, an A-team(Asynchronous Team ) based approach for Reactive power and volage control considering static security assessment in a power system with infrastructural deficiencies is proposed. Reactive power and voltage control problem is the one of optimally establishing voltage level given several constraints such as reactive generation, voltage magnitude, line flow, and other switchable reactive power sources. It can be formulated as a mixed-integer linear programming(MILP) problem without deteriorating of solution accuracy to a certain extent. The security assessment is to estimate the relative robustness of the system in Its present state through the evaluation of data provided by security monitoring. Deterministic approach based on AC load flow calculations is adopted to assess the system security, especially voltage security. A security metric, as a standard of measurement for power system security, producting a set of discrete values rather than binary values, is employed. In order to analyze the above two problems, reactive power/voltage control problem and static security assessment problem, in an integrated fashion for real-time operations, a new organizational structure, called an A-team, is adopted. An A-team is an organization for agents which ale all autonomeus, work in parallel and communicate asynchronously, which is well-suited to the development of computer-based, multi-agent systems for operations. This A-team based approach, although it is still in the beginning stage, also has potential for handling other difficult power system problems.

• Journal of electromagnetic engineering and science
• /
• v.10 no.3
• /
• pp.158-165
• /
• 2010

This study reviewed terahertz technologies of time domain spectroscopy, T-ray imaging, and high rate wireless data transfer. The main topics of the terahertz research area were investigation of materials and package modules for terahertz wave generation and detection, and setup of the terahertz system for time domain spectroscopy(TDS), T-ray imaging and sub-THz wireless communication. In addition to Poly-GaAs film as a photoconductive switching antenna material, a table-top scale for the THz-TDS/imaging system and terahertz continuous wave(CW) generation systems for sub-THz data transfer and narrow band T-ray imaging were designed. Dielectric properties of ferroelectric BSTO($Ba_xSr_{1-x}TiO_3$) films and chalcogenide glass systems were characterized with the THz-TDS system at the THz frequency range. Package modules for terahertz wave transmitter/receiver(Tx/Rx) photoconductive antenna were developed.

• Proceedings of the Korean Geotechical Society Conference
• /
• 2008.03a
• /
• pp.1216-1223
• /
• 2008

Displacement control of earth retaining wall is recognized as the most important item for insuring the stability of ground in urban deep excavation site near by major structure such as subway etc. The field monitoring system is classified by two types as manual system and automatic system. The application case of latter type of field monitoring is increased because real time measurement is possible in automatic system and that is correspondent with the recent constructional trend. Though the automatic monitoring system is more useful and advanced than manual monitoring system, accuracy of the system is not verified sufficiently. It was examined that the reliance of automatic monitoring system in this paper through the comparison of monitoring result obtained three urban excavation site in which the each type of monitoring system was executed concurrently. Result of the examination is that the two types of monitoring system is generally alike in view of monitoring result, so the engineering reliance of automatic system was confirmed in case site. This task was researched in restricted case site, it is expected more precise analysis from security of more data monitored and progressive study.