• Journal of the Optical Society of Korea
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• 제16권2호
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• pp.145-150
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• 2012

We present a display-based visual stimulator for psychophysical and electrophysiological visual sensitivity measurements. The stimulator offers various psychophysical visual stimuli and transfers the signals from external devices along with the stimulation signals to an electrophysiological recorder. As an experimental demonstration, we perform a visual sensitivity experiment in the mesopic vision range by using the display-based stimulator. The intensity of the steady-state visual evoked potential is observed to correlate with the luminance of the flickering visual stimulation. For the psychophysically determined detection thresholds, we determine the mesopic luminance, showing agreement with the perceived brightness within the uncertainty of the luminance measurement.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.387-392
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• 2007

The loss of strength in an aircraft structure as a result of cyclic stress over a period of life time is an important phenomenon for aircraft analysis. Load/stress spectrum can be constructed from the occurrence frequency based on the load/stress histories during a service lifetime. In this paper, three types of fatigue spectrum was compared. The rainflow counting method was applied to concentrate the stress spectrum obtained from the flight loads recorder(FLDR). A fatigue analysis for different stress spectrum was performed by using LUSAS computer application.

• 한국환경과학회:학술대회논문집
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• 한국환경과학회 1998년도 봄 학술발표회 프로그램
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• pp.109-111
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• 1998

A sensor was designed to detect backmixing of vessel fluid into the feedpipe. The sensor was composed of electrodes and a designed electric circuit. The electrodes were installed inside the feedpipe and tap water was flowed into the feedpipe. When NaC1 solution in the vessel penetrate into the feedpipe due to high agitator speed, the conductivity change is sensed by the electrodes and the resultant output signal is recorded by a pen-chart recorder. The electric circuit was designed to show maximum sensitivity. The resolution of this designed sensor was on the order of 10-s mole/l.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 A
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• pp.207-210
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• 1997

The Linear D.C Motor with moving magnet type structured two permanent magnets, three iron bars and winding copper around one of bars. This paper describes the design theory and trust characteristic analysis of Linear D.C Motor. The design theory is very important to Motor design. Here, The design method be obtained by the design theory equation based the flux distribution and design constant. The propriety for this is established by the experiment results.

• 대한의용생체공학회:의공학회지
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• 제18권2호
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• pp.121-126
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• 1997

Endoscopy has become a crucial diagnostic and therapeutic procedure in clinical areas. Over the past three years, we have developed a computerized system to record and store clinical data pertaining to endoscopic surgery of laparascopic cholecystectomy, pelviscopic endometriosis, and surgical arthroscopy. In this study, we developed a computer system, which is composed of a frame yabber, a sound board, a VCR control board, a LAN card and EDMS(endoscopic data management software. Also, computer system has controled peripheral instruments such as a color video printer, a video cassette recorder, and endoscopic input/output signals(image and doctor's comment). Digital endoscopic data management system is based on open architecture and a set of widely available industry standards, namely: windows 3.1 as a operating system, TCP/IP as a network protocol and a time sequence based database that handles both images and doctor's cotnments. For the purpose of data storage, we used MOD and CD-R. Digital endoscopic system was designed to be able to store, recreate, change, and compress signals and medical images.

• 한국우주과학회:학술대회논문집(한국우주과학회보)
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• 한국우주과학회 2004년도 한국우주과학회보 제13권2호
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• pp.337-340
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• 2004

Upper stage telemetry system of KSLV- I (Korea Space Launch Vehicle I) is composed of MDU (Master Data Unit), RDU (Remote Data Unit), SRU (Shock Recorder Unit) and Transmitter. RDU is the front-end telemetry data acquisition unit which gathers analog/discrete signals from various sensors and other units, and transmits the processed data to MDU via MIL-STD-I553B data bus. In order to acquire useful data from analog signal, signal conditioning circuits, such as anti-aliasing or amplifying, should be implemented. For this purpose, SCM (Signal Conditioning Module) had been developed. This paper describes hardware structure of SCM and analog signal conditioning circuits for various sensors. Also, sampling time scheme for different sampling rates were designed and tested.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2017년도 추계학술발표대회
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• pp.760-763
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• 2017

최근 자율주행 자동차의 기술개발이 활발히 진행되고, 실제 출시까지 이어지는 가운데 자율주행자동차의 사고 발생도 증가하고 있다. 자율주행자동차를 이해하기 위하여 컴퓨터 비전 기반의 자율주행 자동차를 구현하고 사고 발생 시 차량 구동과 관련된 중요 정보를 소실하지 않기 위해 외부 서버에 저장하는 연구를 시행한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.351-354
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• 2002

DVR(Digital Video Recorder), a recently popular visual monitoring system, is required to support multi camera channel display(upto 16 channels) with various display modes in real-time. For such a multichannel display system, it is well known that tearing artifacts become more serious. Thus, one needs to design a display system for DVR so that it does not show tearing artifacts as much as possible, but keeps real-time display speed. In this paper, we present our efforts in designing and implementing a display system which rarely ever shows tearing artifacts, but without degradation of required real-time display speed, and which displays character information stably without blinking.

• 한국간호교육학회지
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• 제20권4호
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• pp.452-462
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• 2014

Purpose: This study explores the experience of university life in an unfamiliar department by first-year graduate students. Method: Data were collected from participants through focus group interviews between July and August 2013 using phenomenological research methods. Colsizzi's method was used for analysis after the institutional review board of the university approved the study and informed consent was obtained from the participants. All interviews were recorded on an MP3 recorder and transcribed. Results: The analysis revealed 51 meanings that were categorized by 15 key words into 6 themes: "sense of isolation," "feeling of solidarity," "limitations," "benefits," "overcoming" and "renewing." Conclusion: First-year graduate students experience both positive and negative feelings toward "university life"; however, they eventually overcome their difficulties and adapt to the conditions of their field of study and new department.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2011년도 춘계학술대회
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• pp.87-88
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• 2011

다기능 선박조종시뮬레이터(Full-mission Shiphandling Simulator)를 이용한 사고분석 방법을 한국해양수산연수원이 보유한 DNV(Det Norske Veritas)선급에서 "Integrated Simulator System, NAUT AW(SIM), DYNPOS-AUT(SIM), HSC, TUG, ICE" Class로 인정하고, STCW 협약 Regulation I/12를 충족한 Russia TRANSAS사의 "NAVI-TRAINER PROFESSIONAL 5000 NTPRO 5000" Full-mission Shiphandling Simulator를 이용하여 시행하였다.