• 한국정보과학회논문지:소프트웨어및응용
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• 제30권10호
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• pp.894-903
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• 2003

XML은 점차 널리 사용되고 있지만, 일반 사용자가 편집기를 이용해서 XML 문서를 작성하기에는 아직 많은 어려움이 있다. XML 문서 중에서 상당 부분은 정형화된 데이타를 처리하기 위한 데이터 중심 XML 문서이며, 이러한 형태의 문서인 경우에 초보자도 폼(form) 형태의 GUI를 이용해서 쉽게 작성할 수 있다. 본 논문에서는 데이타 중심 XML 문서에 대해서 모델 기반으로 폼 형태의 XML 편집기를 자동적으로 생성할 수 있는 방법과 편집기 생성기인 XED를 소개한다. XML 문서의 DTD는 연속, 선택, 반복의 구조로 이루어져 있으며, 이러한 구조는 DDG (Document Decomposition Graph) 그래프로 표현될 수 있다. XED는 XML의 DDG에 사용자가 프리젠테이션 규칙을 적용함으로써 XML 편집기를 자동적으로 생성할 수 있고, 사용자가 생성된 편집기의 레이아웃과 GUI 속성을 직접 조작을 통해서 변경할 수 있는 방법을 제공한다.

• Journal of the Korean Data and Information Science Society
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• 제23권6호
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• pp.1203-1212
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• 2012

본 논문에서는 1977년 미국 국립기술표준원이 연방정보처리기준 46으로 공표한 암호화 표준인 현대 대칭키 블록 암호 DES (data encryption standard)의 라운드 키 생성기에 대한 엑셀 매크로 기능을 활용한 라운드 키 생성을 개발하였다. 평문과 암호문과의 관계를 숨기는 확산과 암호문과 암호 키 사이의 관계를 숨기는 혼돈을 반복하는 라운드의 반복으로 평문을 암호화 하는 DES의 설명과 라운드 키 생성 알고리즘을 소개하고 이를 엑셀 매크로기능을 이용하여 라운드 키를 구현하는 생성개발을 제안하고 개발된 매크로의 정확성과 활용성을 서술하였다.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2005년도 하계학술대회
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• pp.159-165
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• 2005

The proposed optical transmitter is composed of FF(flip flop) , PLL (phase locked loop), reference clock generator, serializer and LD driver 10x250 Mb/s data arrays are translated to the 2.5 Gb/s data signal by serializer. In this case, 1 data bus is allocated usually as a reference clock for synchronization. In this proposed optical transmitter, 125 MHz reference clock is generated from 10x250 Mb/s data arrays by reference clock generator. From this method. absent of reference clock bus is available and more data transmission become possible. To achieve high speed operation, the serializer circuit is designed as two stacks. For 10:1 serialization, 10 clocks that have 1/10 lambda differences is essential, so the VCO (voltage controlled oscillator) composed of 10 delay buffers is designed. PLL is for runing at 250 MHz, and dual PFD(phase frequency detector) is adopted for fast locking time. The optical transmitter is designed by using 0.35 um CMOS technology.

• 전자공학회논문지CI
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• 제47권6호
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• pp.103-112
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• 2010

네트워크 트래픽 분석 및 모델링은 그 중요성에 따라 많은 연구가 진행되어온 영역이다. 기존의 네트워크 트래픽 분석 및 모델링 관련 연구는 간단한 패킷 스트림을 전송하거나 HTTP와 같은 특정 어플리케이션의 트래픽 특성을 반영하는데 초점이 맞춰져 있다. 본 논문에서는 멀티미디어 데이터의 특성을 반영한 네트워크 트래픽 생성기를 제안한다. 멀티미디어 데이터의 특성을 반영하기 위해 대표적인 멀티미디어 콘텐츠인 온라인 게임의 트래픽을 분석하기 위해서 온라인 게임의 패킷 전송간 시간과 패킷 크기 확률변수들에 따른 분포를 모델링 하였으며 그 모델을 입력으로 갖는 네트워크 트래픽 생성기의 구조를 제시하였다. 제안된 네트워크 트래픽 생성기를 이용하여 L4D(Left4Dead), WoW(World of Warcraft)의 트래픽을 생성해 본 결과 실제 데이터와 유사도가 높은 분포를 갖는 것을 확인 할 수 있었다.

• 대한수학회지
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• 제59권6호
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• pp.1083-1101
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• 2022

In this paper, we study backward stochastic differential equations (BSDEs shortly) with jumps that have Lipschitz generator in a general filtration supporting a Brownian motion and an independent Poisson random measure. Under just integrability on the data we show that such equations admit a unique solution which belongs to class 𝔻.

• Smart Structures and Systems
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• 제15권6호
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• pp.1625-1642
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• 2015

We propose an electrically self-reliant structural health monitoring (SHM) system that is able to wirelessly transmit sensing data using electrical power generated by vibration without the need for additional external power sources. The provision of reliable electricity to wireless SHM systems is a highly important issue that has often been ignored, and to expand the applicability of various wireless SHM innovations, it will be necessary to develop comprehensive wireless SHM devices including stable electricity sources. In light of this need, we propose a new, highly efficient vibration-powered generator based on a tuned-mass-damper (TMD) mechanism that is quite suitable for vibration-based SHM. The charging time of the TMD generator is shorter than that of conventional generators based on the impedance matching method, and the proposed TMD generator can harvest 16 times the amount of energy that a conventional generator can. The charging time of an SHM wireless transmitter is quantitatively formulated. We conduct wireless monitoring experiments to validate a wireless SHM system composed of a self-reliant SHM and a vibration-powered TMD generator.

• 전기학회논문지P
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• 제61권1호
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• pp.35-40
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• 2012

An AC generator is an important component in producing an electric power and so it requires highly reliable protection relays to minimize the possibility of demage occurring under fault conditions. It is a need for research of digital generator protection system(DGPS) for the next-generation ECMS and an efficient operation of protection control system in power station. However, most of protection and control system used in power plants have been still imported as turn-key and operated in domestic. This may cause the lack of the correct understanding on the protection systems and methods, and thus have difficulties in optimal operation. In this paper, presented ratio differential relaying(RDR) is main protective element in generator protection IED. The fault detection technique, operation zone and setting value of the RDR were studied and, compared with two of the fault detection algorithm. For evaluation performance of the RDR, the data obtained from ATPDraw5.7p4 modeling was used. The proposed methods are shown to be able to rapidly identify internal fault and did not operate a miss-operation for all the external fault.

• Journal of Power Electronics
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• 제11권4호
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• pp.527-532
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• 2011

Due to the need for improved fuel consumption and the trend towards increasing the electrical content in automobiles, integrated starter generator (ISG) systems are being considered by the automotive industry. In this paper, in order to change the conventional generator of a vehicle, a belt driven integrated starter generator is considered. The overall ISG system, the design considerations for the claw pole type AC electric machine and a low voltage very high current power stage implementation are discussed. Test data on the low voltage claw pole type machine is presented, and a large current voltage source DC/AC inverter suitable for low voltage integrated starter generator operation is also presented. A metal based PCB (Printed Circuit Board) power unit to attach the 4-parallel MOS-FETs is used to achieve extremely high current capability. Furthermore, issues related to the torque assistance during vehicle acceleration and the generation/regeneration characteristics are discussed. A prototype with the capability of up to 1000 A and 27 V is designed and built to validate the kilo-amp inverter.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.527-532
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• 2014

Generator is the main equipment of a power plant that generates electric power. The line frequency is 60Hz, since that is operated at 3600rpm in fossil power plant. Therefore, the specific frequency 120Hz by the electromagnetic excitation force is generated inherently. If the looseness of stator at generator happens, abnormal sound that has 120Hz and the harmonic frequency is emitted from generator frame. In that case, binding of end-winding or re-wedging is needed for the reduction of sound level. In case of severe level of sound, belly band can be additionally installed at core. In this paper, the characteristics of generator sound is described and modal data is analyzed after installation of belly band.

• 한국압력기기공학회 논문집
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• 제7권4호
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• pp.19-25
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• 2011

Steam Generator(SG) tube is an important component of Nuclear Power Plant(NPP), which is the pressure boundary between the primary and secondary systems. The integrity of SG tube has been confirmed by the eddy current test every outage. The eddy current technique adopting bobbin probe is currently the primary technique for the steam generator tubing integrity assesment. The bobbin probe is one of the essential components which consist of the whole ECT examination system and provides us a decisive data for the evaluation of tube integrity. Until now, all of the ECT bobbin probes in Korea which is necessary to carry out inspection are imported from overseas. However, KHNP has recently developed the bobbin probe design technology and transferred it to domestic manufacturers to fabricate the probes. This study has been conducted to establish technical requirements applicable to the steam generator tube inspection using the bobbin probes fabricated by the domestic manufactures. The results have been compared with the results obtained by using foreign probe to identify the availability to the steam generator tube inspection. As a result, it is confirmed that the domestic bobbin probe is generally applicable to SG tube inspection in the NPPs.