• 한국화재소방학회논문지
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• 제32권5호
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• pp.57-66
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• 2018

29명이 사망하고 40명이 부상을 입은 제천 스포츠센터 화재 사례에 대해 다수 사상자가 발생한 원인을 초기대응과 관리적인 측면을 중심으로 분석하였다. 초기대응 측면은 119신고 지연, 2층 세신사 비상구로 피난유도를 하지 않음, 1층과 3층 비상계단쪽 방화문 개방 상태 유지, 3층 주계단실 쪽 방화문 닫지 않음, 비상방송을 하지 않음으로 분석하였다. 관리적인 측면은 1층의 스프링클러설비 알람밸브 폐쇄, 소방펌프 제어반에서 기동 정지 위치에 놓음, 주차장 반자 안 누수 및 누전 방치, 2층 여탕의 휴게실 피난구유도등이 가려져 있고 비상구에 물건이 적치됨, 2층 자동문의 조작버튼 불량상태로 방치, 형식적인 소방안전관리, 소방시설 부실한 자체점검, 방화셔터와 배연창 미작동으로 분석하였다.

• 항공우주시스템공학회지
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• 제15권3호
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• pp.57-64
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• 2021

본 연구에서는 KV의 유도조종오차를 최소화하여 직격요격 성능을 확보하고자 DACS 구동장치에 대한 위치정확도 점검방안을 제안하였다. DACS 구동장치의 정확도 성능은 탄도미사일 요격에 중요한 성능 중 하나이다. DACS 구동장치의 정확도 성능을 검증하기 위해 위치정확도란 점검 항목을 도출하였고, 이에 대한 점검시스템 설계 및 점검절차를 기술하였다. 핀틀 위치정확도 점검시스템은 레이저 변위센서를 이용하여 핀틀의 구동변위를 외부 계측할 수 있도록 구성하였고, 외부 계측한 데이터는 실시간으로 구동명령 및 피드백 데이터와 비교분석할 수 있도록 설계하였다. 본 논문에서 제안하는 위치정확도 점검시스템은 DACS 조립체 뿐만 아니라 유도탄 조립체 단위에서도 점검이 가능하도록 설계하였다. 설계된 점검시스템을 이용하여 핀틀의 위치정확도 점검을 수행하였고, 점검 결과를 분석하였다.

• 한국기술혁신학회:학술대회논문집
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• 한국기술혁신학회 2003년도 춘계학술대회
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• pp.413-425
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• 2003

Information Technology is the kernel technology deciding the industrial standard of one nation, and biotechnology will be the main technology of next generation. Based on this fact, a lot of efforts were made to industrialize them. Nano Technology is beginning to position itself as the kernel fusion technology, and its usage and popularity is expanding. Environmental and Energy Technology is a must-have strategic technology considering the increase demand of new energy development, the international environment correspondence, the environment-friendly production, and so forth. Space Technology is the field, which will contribute to raise the domestic component and system technology to the next level. In 2001, new technology research development costs total of 1 trillion 32 billion won in the following fields; 437.82 billion won in IT, 88.457 billion won in BT, 46.799 billion won in NT, 315.682 billion won in ET, and 112 billion won in ST. from component ratio, IT forms 42% which is the most, 31% for ET and in order of BT, ST and NT. ETRI and KISTI are concentrating on IT, KIBB is on BT, KAERI, KIER, KERI and KBSI are focusing on ET, and KIMM, KRISS, KRICT and KORDI is participating together in 4∼5 new technology such as IT, BT, NT and ET. Funds for research development costs in 5 new technology fields of 13 contribution (year) are consisted as follows; The Office for Government Policy Coordination has contributed 131 billion won (13%), 387 billion won (37%) by MOST, 256 billion won (25%) by Ministry of Information and Communication, 67 billion won (6%) by Ministry of Commerce, Industry and Energy, 19% by others and the industrial world. < Strategy for Technology Advancing > o Promotion of comprehensive contributing (year) new technology development research plan project o Increase research efficiency by promoting new technology development project connected with peculiar projects of organization by contribution (year) o Formation of superior research group by technology and introduction of operation system for research accumulation are needed. o Technology demand-oriented assignment deduction and promotion of research development project connected with intermediate long term objective o National will and investment extension of research development costs, training and popularization of professionals, commercialization promotion with efficient control for research plan and result.

• 한국정보통신학회논문지
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• 제4권3호
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• pp.517-526
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• 2000

본 논문에서는 직접대역확산통신시스템에서 코딩 이득을 향상시키고자 다중 심벌 검파를 수행하는 트렐리스 부호화 변조를 적용하였다. $MDPSK(\pi/4 shift QPSK)$를 트렐리스 부호화된 직접대역확산시스템 적용하고 정보가 인접한 채널 신호의 위상차에 전송된다는 것을 이용하여 1차 위상차 뿐만 아니라 다중위상차를 추출한다. BER특성을 향상시키기 위해, 이러한 다중 위상차를 이용하여 $MDPSK(\pi/4 shift QPSK)$에서 다중 심벌 검파를 수행하는 트렐리스 부호화된 직접대역확산시스템의 비터비 디코더 알고리듬을 설계하여 향상된 코딩 이득을 얻고자 한다. 이러한 시스템을 직접대역확산통신시스템에 적용하였을 때 얻을 수 있는 코딩 이득은 시뮬레이션 결과, AWGN채널에서 TCM의 콘볼류션부호화기의 상태수 4, 8, 16에 따라 3-4dB 정도의 성능향상이 있으며, 레일레이 페이딩 채널에서는 4-5dB정도의 성능 향상이 있음을 알 수 있다. 일반적으로 상태수가 증가할수록 더 큰 코딩 이득을 얻을 수 있다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.514-518
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• 2003

In this paper, we investigate three dimensional optimal evasive maneuver patterns for air-to-surface attack missiles against proportionally navigated anti-air defense missiles. Interception error of the defense missile can be generated by evasive maneuver of the attack missile during the time of flight for which the defense missile intercepts the attack missile. Time varying weighted sum of the inverse of these interception errors forms a performance index to be minimized. Direct parameter optimization technique using CFSQP is adopted to get the attack missile's optimal evasive maneuver patterns according to parameter changes of both the attack missile and the defense missile such as maneuver limit and time constant of autopilot approximated by the 1st order lag system. The overall shape of resultant optimal evasive maneuver to enhance the survivability of air-to-surface missiles against proportionally navigated anti-air missiles is a kind of deformed barrel roll.

• 비파괴검사학회지
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• 제11권2호
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• pp.42-47
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• 1991

Nondestructive evaluation study was made on creep damage materials by ultrasonic spectrum analysis. The evaluation methods was developed in order to predict the change of ultrasonic attenuation with increasing creep damage. A new algorithm for the improvement of measuring accuracy of ultrasonic attenuation using a spectrum analysis has been developed. Normally, the ultrasonic attenuation is evaluated from 1st and 2nd peak values of the pulse-echo ultrasonic wave. The algorithm developed is incorporated in a measuring system which consists of a personal computer with ultrasonic apparatus and a digital storage oscilloscope. By the spectrum analysis method, it become popssible to describe approximately the attenuation change with increassing creep damage in Cr-Mo-V forging.

• 한국환경과학회지
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• 제4권3호
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• pp.221-228
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• 1995

Stability of reactor and effect on biofilm characteristics were investigated by varying the hydraulic residence time in an inverse fluidized bed biofilm reactor(IFBBR). The SCOD removal efficiency was maintained above 90 % in the HRT range of 12hr to 2hr, but the TCOD removal efficiency was dropped down to 50% because of biomass detachment from overgrown bioparticles. The reactor was stably operated up to the conditions of HRT of 2hr and F/M ratio of 4.5kgCOD/$m^3$/day, but above the range there was an abrupt increase of filamentous microorganisms. The optimum biofilm thickness and the biofilm dry density in this experiment were shown as $200\mu\textrm{m}$ and $0.08 g/cm^3$, respectively. The substrate removal rate of this system was found as 1st order because the biofilm was maintained slightly thin by the increased hydraulic loading rate.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2007년도 추계 학술대회논문집
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• pp.100-110
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• 2007

A new design approach for a delicate treatment of complex geometries such as a wing/body configuration is arranged using overset mesh technique under large scale computing environment for turbulent viscous flow. Various pre- and post-processing techniques which are required of overset flow analysis and sensitivity analysis codes are discussed for design optimization problems based on gradient based optimization method (GBOM). The overset flow analysis code is validated by comparing with the experimental data of a wing/body configuration (DLR-F4) from the 1st Drag Prediction Workshop (DPW-I). In order to examine the applicability of the present design tools, careful design works for the drag minimization problem of a wing/body configuration are carried out by using the developed aerodynamic shape optimization tools for the viscous flow over multiple-body aircraft geometries.

• 소음진동
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• 제8권3호
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• pp.441-449
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• 1998

A self-tuning control scheme, incorporated with the simplified 1st-order ARMAX(Auto-Regressive Moving Average eXogenous) model, for single rod hydraulic cylinder which has varying dynamic characteristics is presented here. An adaptive controller is developed for the system that uses feedforward and optimal feedback control for simultaneous parameter identification and tracking control. Through experimental results, the performance comparison of the self-tuning controller with a fixed gain proportional controller clearly shows its superior ability in handling load changes in quiescent states.

• 대한전자공학회논문지
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• 제20권5호
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• pp.31-36
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• 1983

W.L.S. 알고리즘을 이용한 간접 M. R. L C. 방식으로서 직류전동기의 속도를 마이크로프로세서 M6509를 사용하여 제어하였으며 이를 통하여 W.L.S. 알고리즘의 빠른 수렴속도와 부하변동에 잘 적응하는 특성을 고략하였다.