• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.422-423
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• 2015

현재 허용전류는 가장 열악한 조건과 여유분을 주어 계산하기 때문에 지중 송전 케이블의 실제 송전용량은 설계보다 상당히 큰 용량을 사용할 수 있다. 송전용량을 증대시키는 방법 중 하나로 DRS(Dynamic Rating System)를 도입하는 방법이 떠오르고 있다. DRS는 이미 상용화 되어있으나 지중관로의 경우 기존에 포설되어 있는 케이블에 DTS를 설치하기가 곤란하여 관로조건에서는 동적 허용전류를 산정하기에 어려움이 있다. 따라서 본 논문에서는 DTS 계측자료를 이용하여 보정계수법을 통한 허용전류 산정 방법론을 제안한다. 또한 지중관로의 맨홀부에서 측정한 케이블의 표면 온도를 이용하여 관로 내 케이블의 분포 표면 온도를 추정하고 보정계수를 통한 허용전류를 산정하는 방법론을 제안한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.7
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• pp.823-832
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• 2016

This paper presents a generation method of test streams for verifying conformance of an UHD broadcasting receiver including decoders for video and audio as well as parsers for PSIP and closed caption data. The proposed test streams for video/audio signals can evaluate conformance of HEVC, AC-3 and DTS-HD standards. Especially, test streams for HEVC video compression standard can be used for testing syntax compliance and error resilience for a HEVC decoder. Moreover, the proposed test streams for system/program and closed caption can be applied for verifying parsers for PSIP and CEA-708 standards.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.376-377
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• 2011

DTS(Dispatcher Training Simulator)는 EMS(Energy management System) 전력계통 모델을 기반으로 off-line 환경에서 운영되는 급전원 훈련용 시뮬레이터이다. 급전원들은 DTS를 활용하여 다양한 상황별 시나리오를 반복 훈련함으로써 실제 전력계통 운영 및 유사시 대응능력을 배양할 수 있다. 본 논문은 전력거래소 중앙급전소에서 급전원 훈련용으로 사용되는 DTS의 다양한 기능 및 구조, 활용실적과 실시간 계통운영 적용 사례를 소개하고자 한다.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.227-228
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• 2015

DTS(Dispatcher Training Simulator)는 EMS(Energy Management System) 전력계통 모델을 기반으로 off-line 환경에서 운영되는 급전원 훈련용 시뮬레이터이다. 전력거래소 중앙전력관제센터는 DTS를 이용하여 다양한 상황별 고장복구 훈련을 시행하고 있으며, 계통 검토 검증에도 활용하고 있다. 본 논문은 DTS를 활용하여 육지계통 UFR 동작과 광역정전 발생을 모의하고, 그에 따른 전력계통 변화와 정상운영 조치 시뮬레이션 결과에 대해 소개하고자 한다.

• Journal of the Korea Society of Computer and Information
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• v.14 no.2
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• pp.9-16
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• 2009

While the broadband network and multimedia technology are being developed, the commercial market of digital contents as well as using IPTV has been widely spreading. In this background, Time-Shift system is developed for requirement of multimedia. This system is independent of Time but is not independent of Place and Occasion. For solving these problems, in this paper, we propose the TPO(Time, Place, Occasion)-Shift system for mobile multimedia devices. The profile that can be applied to the mobile multimedia devices is much different from that of the setter-box. And general mobile multimedia devices could not have such large memories that is for multimedia data. So it is important to continuously store and manage those multimedia data in limited capacity with mobile device's profile. Therefore we compose the basket in a way using defined time unit and manage these baskets for effective buffer management. In addition. since the file name of basket is made up to include a basket's time information, we can make use of this time information as DTS(Decoding Time Stamp). When some multimedia content is converted to be available for portable multimedia devices, we are able to compose new formatted contents using such DTS information. Using basket based buffer systems, we can compose the contents by real time in mobile multimedia devices and save some memory. In order to see the system's real-time operation and performance, we implemented the proposed TPO-Shift system on the basis of mobile device, MS340. And setter-box are desisted by using directshow player under Windows Vista environment. As a result, we can find the usefulness and real-time operation of the proposed systems.

• Geotechnical Engineering
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• v.28 no.1
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• pp.28-38
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• 2011

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.3
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• pp.492-498
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• 2010

Since it is almost impossible to train the dispatchers with real power system, the dispatcher training simulator(DTS) is used for the training. Among various components of the DTS, the power system model(PSM) emulates the dynamic behavior of the power system to calculate the frequency and voltage. The frequency is calculated from various parameters such as mechanical power of power plants, load, inertia, and the damping of the power system. In the PSM, the power plants are modeled as differential equations, so the mechanical power of the power plants are calculated by the numerical methods. Conventionally, the fixed step-size algorithm has been used in the PSM, however it has some drawbacks. This paper develops the prototype PSM using the Matlab, and analyzes the problems of the fixed step-size algorithm by comparing the results with those of PSCAD simulation. In order to overcome the limitations, this paper proposes a modified frequency calculation method using the adaptive step-size algorithm. From the simulation using the proposed method, it is verified that the accuracy of frequency calculation increases substantially while the simulation time is not greatly increased.

• Journal of Aerospace System Engineering
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• v.4 no.4
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• pp.28-36
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• 2010

Current tanks have been developed to increase mobility and firepower, and its maximum range and destructive power are improved. This great change causes remained vibration of a gun barrel after firing. For this reason, people are trying to control vibration of gun barrel effectively. This thesis presents a modeling method and analysis results for gun barrel by using a thermal shroud as an absorber mass. DTS(Dynamically Tuned Shroud) is a vibration damping system using a thermal shroud as an added mass for decreasing remained vibration. The model has an advantage that the gun barrel's vibration can be decreased by dissipating a kinetic energy of thermal shroud without install an additional dynamic absorber to tip of the gun barrel. For analyzing the damping performance of the DTS, We derived an equation of motion of the barrel after setting a mathematical modeling, and found out the frequency analysis and tendency according to stiffness ratio between barrel and shroud.

• The KIPS Transactions:PartD
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• v.15D no.3
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• pp.321-326
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• 2008

The software defects that are not found in the course of a project frequently appear during the conduct of the maintenance procedure after the complete development of the software. As the frequency of surfacing of defects during the maintenance procedure increases, the cost likewise increases, and the quality and customer reliability decreases. The defect rate will go down only if cause analysis and process improvement are constantly performed. This study embodies the defect tracking system (DTS) by considering the Pareto principle: that most defects are repetitions of defects that have previously occurred. Based on the records of previously occurring defects found during the conduct of a maintenance procedure, DTS tracks the causes of the software defects and provides the developer, operator, and maintenance engineer with the basic data for the improvement of the software concerned so that the defect will no longer be manifested or repeated. The basic function of DTS is to analyze the defect type, provide the measurement index for it, and aggregate the program defect type. Doing these will pave the way for the full correction of all the defects of a software as it will enable the defect correction team to check the measured defect type. When DTS was applied in the software configuration management system of the W company, around 65% of all its software defects were corrected.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.391_392
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• 2009

DTS 시스템에서 측정하는 분포온도 데이터는 지중케이블의 상태 감시에 유용하게 사용될 수 있다. 본 연구에서는 분포온도센서로부터 획득되는 온도 데이터를 기반으로 지중케이블의 상태 감시 및 실시간 허용용량을 산정할 수 있는 모니터링 시스템을 개발하였다. 본 시스템은 사례 기반의 모니터링 GUI를 구축하는 것을 지양하고, 임의의 지중케이블 시스템에 적용이 가능한 GUI 설정 기능을 갖추었으며, 케이블의 동적허용용량 산정 모듈, 분포온도 해석 모듈, 경보 모듈, 설정 모듈, 이력조회 모듈 등으로 구성된다.