• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1989년도 춘계학술대회
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• pp.75-76
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• 1989

The blood bank is a field of clinical pathology which requires the most accuratemaintenanceofrecording. Because the mistake in it is directly related to a patient's life. So, the computerization of the blood bank is urgent to maintain a log blook arid to compare the patient's current data with past result. We developed the blood bank management program using 32 bit minicomputer. This is composed of 4 parts; a management of routine test result, special test result, the blood issue and statistics. The management of routine test result handles the patient's information and blood typing and compares above results with the past one of same patient. The management of special test result are for special immunohematologic tests like an irregular antibody, Coombs' test, and etc. Blood issue part records the type of the blood bag, component, and the name of issuer. Statistic part are made to get statistics of each day and each month by the blood type, and the type the blood component. The program is secured by the maintenance of operator's operation history and thu provision of the security code to each operator, without which no one can enter the system and after the content. So the stability and reliability of the data is obtained. This program will be upgraded for bar-code using system in the near future.

• 화약ㆍ발파
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• 제20권4호
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• pp.17-28
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• 2002

화약발파를 이용한 건물해체 설계에서 고려해야할 중요한 인자중 하나는 안전 문제이다. 도심지에서 수행된 건물발파해체 사례에 의하면 부재 폭파시 발생한 파쇄물이 비산되어 인접한 건물이나 인명에 피해를 주어 심각한 문제를 야기시킨 사례들이 보고된바 있다. 본 논문에서는 건물발파해체시 발파로 제거하는 주요 부재중 하나로서 철근콘크리트 기둥에 대한 적절한 방호기법을 개발하기 위해 수행된 실험적 연구 결과를 제시한다. 기둥은 실제 규모로 제작되었으며 몇 가지 재료들에 대하여 고속카메라를 이용한 관찰 및 파괴 특성을 고찰하고 방호 특성을 분석하였다. 주요 결과의 하나로써 비산을 제어하는 핵심 기술은 기둥 발파시 발생하는 가스압을 제어하는 기술임이 확인되었으며 이를 위한 방호재 설치 기법이 제시되었다. 이 기술은 실제 발파해체시 성공적으로 적용되 었다.

• 대한조선학회논문집
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• 제48권4호
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• pp.330-335
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• 2011

This paper presents estimation of average compressive strengths of three types of stiffened panels under lateral pressure and axial compression based on simplified formulas from CSRs and nonlinear FEAs. FEA scenarios are prepared based on the slenderness ratios of the stiffened panels used for in-service vessels. The seven step lateral pressures by 1bar increment are imposed on FE models assuming maximum 30m water height. The number of FEAs for FB-, AB-, and TB-stiffened panels is totally 189 times. FEA results show that existence of pressure can evolves significant reduction of ultimate strengths, meanwhile CSR formulas do not take into account the lateral pressure effect. Lateral pressure acting on the stiffened panel with higher column slenderness ratio more reduces the ultimate strengths than those with smaller column slenderness ratio. A new concept of relative average compressive strain energy instead of the ultimate strength is introduced in order to rationally compare the average compressive strength through complete compressive straining regime. The differences of the ultimate strengths between CSR formulas and FEA results are relatively small for FB- and AB-stiffened panels, but larger discrepancies of relative average compressive strain energies are shown.

• 한국농공학회논문집
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• 제60권4호
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• pp.15-25
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• 2018

The accident risk at the construction workplace associated with agricultural engineering is comparatively higher than those of other fields due mainly to its complex work types and processes. Agricultural engineering deals with a variety of agricultural infrastructures from irrigation and drainage facilities to giant-scale coastal reclamation land infrastructures. The characteristics that most agricultural projects have conducted on a small-scale even worsen the situation drawing low attentions to risk management. Therefore, systematical risk assessment that focuses on details of agricultural construction work process is required in order to enhance safety management capacity and to prevent repetitive accidents ultimately. This study aims to categorize construction work types and processes of agricultural construction works, and to quantitatively assess the accident risk of them based on accident analysis. Regarding classification of construction works, actual 827 accident cases were thoroughly reviewed and coded by their construction site, facility and work type, project scale and so on. Most accidents (71.8 % of total cases) occurred in small-scale construction workplaces with less than 5 billion Korean won project budget. And those accidents related to agricultural infrastructure project (37.4%) and agricultural water development project (22.4%). In terms of work types, accidents frequently took place in form-work followed by pipe installation work, steel bar work and concrete work. The potential risks were compared with actual outbreak of accidents based on Analytic Hierarchy Process (AHP). The results show that the potential conditions of accident expected to be took place is somewhat different from the actual conditions where accidents actually happened. This implicates that risk management manuals or education needs to be adjusted by reflecting unexpected circumstances. Overall, this study is meaningful in that the results could be foundations as to strengthen risk management capacity for agricultural engineering projects.

• 한국건축시공학회지
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• 제11권4호
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• pp.371-378
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• 2011

콘크리트는 다공질로서 수분이 접하게 되면 시간경과에 따라 흡수가 일어난다. 다양한 배합의 콘크리트에서 어느 정도 수분 흡수가 빨리 일어나는가는 흡수수분 확산계수 산출을 통하여 가능하며, 본 연구에서는 길이가 다른 시험체의 질량 경시변화를 통하여 깊이별 흡수 수분량을 산출하였다. 흡수 수분 확산계수는 시간과 깊이의 함수로 이뤄진 볼츠만 변수를 사용하여 실험값과의 회귀분석을 통하여 구하였으며, 그 정확도는 비선형 유한요소 과도해석을 통하여 검증하였다.

• Smart Structures and Systems
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• 제9권5호
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• pp.393-410
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• 2012

Conventional geotechnical instrumentation techniques available for monitoring of slopes, especially soil-nailed slopes have limitations such as electromagnetic interference, low accuracy, poor longterm reliability and difficulty in mounting a series of strain sensors on a soil nail bar with a small-diameter. This paper presents a slope monitoring system based on fibre Bragg grating (FBG) sensing technology. This monitoring system is designed to perform long-term monitoring of slope movements, strains along soil nails, and other slope reinforcement elements. All these FBG sensors are fabricated and calibrated in laboratory and a trial of this monitoring system has been successfully conducted on a roadside slope in Hong Kong. As part of the slope stability improvement works, soil nails and a toe support soldier-pile wall were constructed. During the slope works, more than 100 FBG sensors were installed on a soil nail, a soldier pile, and an in- place inclinometer. The paper presents the layout and arrangement of the instruments as well as the installation procedures adopted. Monitoring data have been collected since March 2008. This trial has demonstrated the great potential of the optical fibre monitoring system for long-term monitoring of slope performance. The advantages of the slope monitoring system and experience gained in the field implementation are also discussed in the paper.

• Nuclear Engineering and Technology
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• 제48권5호
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• pp.1206-1218
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• 2016

This article proposes a highly reliable power and communication system that guarantees the protection of essential instruments in a nuclear power plant under a severe accident. Both power and communication lines are established with not only conventional wired channels, but also the proposed wireless channels for emergency reserve. An inductive power transfer system is selected due to its robust power transfer characteristics under high temperature, high pressure, and highly humid environments with a large amount of scattered debris after a severe accident. A thermal insulation box and a glass-fiber reinforced plastic box are proposed to protect the essential instruments, including vulnerable electronic circuits, from extremely high temperatures of up to $627^{\circ}C$ and pressure of up to 5 bar. The proposed wireless power and communication system is experimentally verified by an inductive power transfer system prototype having a dipole coil structure and prototype Zigbee modules over a 7-m distance, where both the thermal insulation box and the glass-fiber reinforced plastic box are fabricated and tested using a high-temperature chamber. Moreover, an experiment on the effects of a high radiation environment on various electronic devices is conducted based on the radiation test having a maximum accumulated dose of 27 Mrad.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2009년도 추계학술대회
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• pp.15-24
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• 2009

Cycling that transform human energy into mechanical energy is one of the man-machine systems out of sports fields. Benchmarking means " improving ourselves by learning from others ", therefore benchmarking toward dominant cyclist is necessary on field. the goals of this study were to provide important factors on multi-disciplines (kinematics, physiology, power, psychology) for a tailored-training program that is suitable to individual characteristics. Two cyclist participated in this study and gave consent to the experimental procedure. one was dominant cyclist (years:21 yrs, height:177 cm, mass:70 kg), and the other was non-dominant cyclist(years:21, height:176, mass:70). Kinematic data were recorded using six infrared cameras (240Hz) and QTM (software). Physiological data (VO2max, AT) were acquired according to graded exercising test with cycle ergometer and power with Wingate test used by Bar-Or et. al ( 1977) and to evaluate muscle function with Cybex. Psychological data were collected with competitive state anxiety inventory (CSAI-2) that were devised by Martens et. al (1990) and with athletes' self-management questionnaire (ASMQ) of Huh (2003). It appears that the dominant's CV(coefficient of variability) was higher than non-dominant's CV in Sports Biomechanics domain, that the dominant's values for all factors ware higher than non-dominant's values in physical, and physiological domain, and their values between cognitive anxiety and somatic anxiety were contrary to each other in psychology. Further research on multi-disciplines may lead to the development of tailored-optimal training programs applicable with key factors to enhance athletic performance by means of research including athlete, coach and parents.

• 한국지능시스템학회논문지
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• 제24권5호
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• pp.542-547
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• 2014

본 논문에서는 스마트 폰과 휴리스틱 방법을 이용하여 수액 낙하 속도를 측정하고, 수액 투여 시 종료하는 시간을 측정할 수 있는 의료 IT융합 시스템을 안드로이드 환경에서 개발하였다. 먼저 스마트 폰을 사용하여 수액이 낙하하는 영상을 촬영하고, 이를 임계값을 이용하여 이진영상으로 변환한 후 n번째 프레임과 n-1번째 프레임의 차영상을 계산하였다. 이때 휴리스틱을 사용해서 수액 낙하 속도를 정확하게 측정할 수 있기 위한 이진화 변환시에 최적의 임계값을 구하는 일은 중요하다. 그리고 모바일 응용 프로그램 화면의 진행 상태바를 보면서 정확하게 의사 처방에 맞는 수액 주입 속도를 조절할 수 있다. 본 논문에서 제안한 기법으로 실험한 결과 영상 처리 기법을 이용하여 정확하게 일반 환자들에게 충분히 적용할 수 있도록 수액 낙하 속도를 측정할 수 있음을 알 수 있었다.

• 한국ITS학회 논문지
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• 제16권3호
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• pp.15-27
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• 2017

열차 정차시간 증가는 열차 서비스 빈도를 감소시켜 열차와 승강장의 혼잡이 발생하게 된다. 그러므로 열차 정차시간(Train dwell time)에 관한 연구는 열차 운행 계획수립 관점에서 매우 중요하게 다루어 왔다. 본 논문은 계획된 정차시간을 준수할 수 있도록 승객의 유입을 관리하여 승강장 혼잡을 줄일 수 있는 전략들에 활용할 수 있는 실시간 열차 정차시간 예측모형을 개발하였다. 모형의 특징은 실시간으로 수집 가능한 승차인원, 하차인원, 그리고 열차의 중량 등 3가지 독립변수를 적용하였고, 모형의 설명력(${\bar{R^2}}=0.809$)이 대체적으로 정확한 결과를 보여주었다. 실시간 정차시간 모형은 열차가 계획된 정차시간을 준수하도록 승차 승객 수를 조정하는 게이트 미터링 전략에 활용될 수 있다.