• 융합보안논문지
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• 제7권4호
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• pp.61-72
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• 2007

우리는 웹 브라우저 사용자의 편의성 향상을 목표로 4가지 편의 기능이 통합된 브라우저인 SERA Web-Viewer를 개발하였다. 편의 기능으로는 VPV(Visited Page Viewer), APV(Aligned Page Viewer), USC(User Specified Capture)등이 추가되었으며 UCC(User Created Content)의 핵심 기술인 FLV(FLash Video file) 변환을 위한 VAC(Video and Audio Converter)를 부가기능으로 통합하였다. 편의 기능들은 사용자들이 웹 브라우저를 사용하며 가장 필요로 하는 기능들로 웹브라우저의 사용 빈도가 잦고 사용 시간이 긴 고급 사용자들을 대상으로 조사된 바에 따랐다. 위의 네 가지 통합 기능에 대한 구현 상의 알고리즘과 기술을 제안하였고, 인터넷 익스플로러 6.0의 렌더링(rendering) 기술을 이용한 MDI application 기반의 구현 방법을 코드를 통해 설명한다. 구현된 결과를 134명의 컴퓨터학 또는 멀티미디어 공학을 전공하는 학생들을 대상으로 실시한 설문조사의 결과와 비교하여 통합된 편의 기능들이 웹 브라우저 사용자들에게 실질적으로 도움을 줄 수 있다는 것을 보인다.

• 대한물리치료과학회지
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• 제9권4호
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• pp.7-14
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• 2002

The drug therapy for rheumatoid arthritis must be maintained constantly or for the whole life but is apt to induce the adverse effects in gastrointestinal or renal system. Therefor, newer methods are paid attention to reduce adverse effects. The thirty-two rat female separated into seven groups depending on the therapy or Freund's adjuvant applied: Normal group(n=8) not received anything, Positive control group(n=8) only received adjuvant, USC group(n=8) received continuous US, USP group(n=8) received pulsed US. The physical and radiological findings by thermal and non-thermal effects of ultrasound were evaluated in groups with continuous mode at 1 MHz, $0.5\;W/cm^2$ for 6 minutes and with pulsed mode (duty cycle 1:9) at 1 MHz, $0.5\;W/cm^2$ for 6 minutes. The result summarized followings. 1. Swelling of forepaw and hindpaw was significantly reduced in USP. 2. Arthritis indices in USP group were significantly reduced than those in PCG. 3. In naked eye and radiologic findings, swelling was significantly prevented in USP group but not in PCG. The change of swelling, arthritis index, gross feature in naked eye, radiologic finding were significantly improved in all groups except for USC group, taking care for using its continuous mode.

• 한국표면공학회지
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• 제49권2호
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• pp.211-217
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• 2016

Boride coating applied on steam turbine parts of power plants has provided good particle erosion resistance under temperature of $550^{\circ}C$, but it isn't able to protect the parts effectively any more in ultra super critical (USC) steam turbine which is being operated up to temperature of $650^{\circ}C$. To ensure stable durability for USC steam turbine parts, an alternative coating replacing boride coating should be developed. In this study, multi-component boride coatings containing elements such as chromium (Cr) and vanadium (V) were formed on base metal (B50A365B) using thermochemical treatment method called by pack cementation. The thermochemical treatments involve consecutive diffusion of boron(B) and Cr or/and V using pack powders containing diffusion element sources, activators and diluents. The top layer of Cr-boride coating is primarily consisted of $Cr_2B_3$ and $Cr_5B_3$, while that of V-boride coating is mostly consisted of $VB_2$ and $V_2B_3$. The (Cr,V)-boride coating is consisted of $Cr_2B_3$, $Cr_5B_3$ and $V_2B_3$ mostly. The top surfaces of 3 multi-component boride coatings show hardness of $3200-3400H_v$, which is much higher than that of boride, about $1600-2000H_v$. In 5 wt.% NaCl solution immersion tests, the multi-component boride coatings show much better corrosion resistance than boride coating.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 심포지엄 논문집 정보 및 제어부문
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• pp.223-224
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• 2008

초초임계압 화력발전 제어계통 설계와 관련하여 보일러 제어시스템의 기본 요건인 제어전략을 구현하기 위해 현재 표준화력 500MW 제어시스템과 제어로직을 기반으로 1000MW급에서 필요로 하는 새로운 구조의 제어에 요구되는 제어전략에 대해 각종 제어 운전 모드의 구성과 각 운전 모드에서의 제어전략을 개발하고 있다. 최신제어시스템에서 중요하게 취급되는 자동 플랜트 제어(Automatic Plant Control, APE)의 각종 제어전략 구성에 중점을 두고 있으며 Unit Master Control, Boiler Master Control, Turbine blaster Control, Throttle Pressure Control, Fuel/Air Master Control, Forced Draft Fan Control, Induced Draft Fan Control, Primary Air Fan, Feed Water Master Control, Super Heater/Reheater Steam Temp Control 등의 제어전략을 논하고, 실제 프로세스 응단특성 파악을 위해 국내 신규발전소를 방문하여 수집한 프로세스 응답시험 결과와 특성을 분석하고 USC에 적용하기위한 보일러 제어전략에 대해 논하고자 한다.

• 한국압력기기공학회 논문집
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• 제12권1호
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• pp.141-148
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• 2016

This paper presents an overview of worldwide electric power development and National $700^{\circ}C$ Hyper Supercritical coal-fired power generation(HSC) focus on materials and manufacturing process. To Increase the efficiency of electric power generation, It is necessary to increase steam temperature and pressure. In that case, New material and manufacturing process shall be developed for boiler and turbine component in high temperature and pressure operating condition. Therefore, Much Efforts in worldwide are progressing to develop materials and manufacturing technology and to build and operate an HSC.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (하)
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• pp.1965-1968
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• 2002

E.F(Experience Factory)는 지속적인 프로세스 개선을 위하여 도입된 패러다임으로서 1970년대 미국의 USC/UMD와 NASA/GFSC 등에서 추진되었으며 지금은 여러기업으로 확산 및 적용되고 있다. 이 방법론의 특징은 재사용 가능한 프로젝트 정보 및 프로세스 속성을 데이터베이스로 구축하여, 외부개선모델의 도입없이 자체적인 반복활동으로 프로세스 개선이 가능하다는데 있다. 국내 기업들은 프로세스 개선활동을 수행하고 있으나 아직까지 E.F 구축을 위한 사례는 보고된 바가 없다. 본 논문에서는 이러한 국내실정을 감안한 E.F 프레임워크의 구축방안에 대하여 논하고자 한다.

• 대한치과의사협회지
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• 제51권6호
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• pp.337-345
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• 2013

Currently CAD/CAM technology has been used widely in dentistry. But it has mainly been focused on fabrication of fixed partial dentures and implant-supported prosthesis. DENTCA company uses new cutting edge of CAD/CAM technology to revolutionize denture production. With developing a CAD/CAM technology of DENTCA company, it is possible to make complete dentures with minimum visits to the clinic. The aim of this article is to introduce a new denture-making method by CAD/CAM.

• ETRI Journal
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• 제20권4호
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• pp.301-326
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• 1998

In this paper, we have modeled and evaluated a new parallel processing system called Scalable Parallel computer Architecture based on Xbar (SPAX) for commercial applications. SMP systems are widely used as servers for commercial applications; however, they have very limited scalability. SPAX cost-effectively overcomes the SMP limitation by providing both scalability and application portability. To investigate whether the new architecture satisfies the requirements of commercial applications, we have built a system model and a workload model. The results of the simulation study show that the I/O subsystem becomes the major bottleneck. We found that SPAX can still meet the I/O requirement of the OLTP workload as it supports flexible I/O subsystem. We also investigated what will be the next most important bottleneck in SPAX and how to remove it. We found that the newly developed system network called Xcent-Net will not be a bottleneck in the I/O data path. We also show the optimal configuration that is to be considered for system tuning.

• 한국세라믹학회지
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• 제40권7호
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• pp.625-631
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• 2003

Recent work at USC has focused on strategies to enhance the toughness and overall mechanical performance of polymer foams for use in lightweight sandwich structures. Both mechanical and chemical approaches have been employed with reasonable success. Fiber reinforcement, though difficult from a processing perspective, can lead to substantial enhancements in toughness and strength, while reducing friability. Chemical modifications are also challenging from a processing perspective, but can produce similar enhancements in performance. Efforts to enhance performance of phenolic foam and PVC foam through fiber reinforcement and chemical modification are described, along with the resulting enhancements in performance.

• Journal of Electrical Engineering and Technology
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• 제6권3호
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• pp.423-430
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• 2011

Multi-input multi-output (MIMO) dynamic matrix control (DMC) technique is applied to control steam temperatures in a large-scale ultrasupercritical once-through boiler-turbine system. Specifically, four output variables (i.e., outlet temperatures of platen superheater, finish superheater, primary reheater, and finish reheater) are controlled using four input variables (i.e., two spray valves, bypass valve, and damper). The step-response matrix for the MIMO DMC is constructed using the four input and the four output variables. Online optimization is performed for the MIMO DMC using the model predictive control technique. The MIMO DMC controller is implemented in a full-scope power plant simulator with satisfactory performance.