• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 봄 학술발표회 논문집
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• pp.221-226
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• 1994

A safety evaluation of cable tunnel, which is a concrete box structure with telecommunication facilities in it, exposed to fire is given. The immediate field observation was performed to find out any sign of sudden structural failure. In some region, where the fire intensity was heavy, the spalling of concrete cover in upper slab occurred. Next, more careful investigation was done with proper non-desturctive testing methods and structural analysis taking into account the changes in material properties due to fire. It seems that there is no severe damage on concrete, reinforcements and over all structural system.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 가을 학술발표논문집 Vol.27 No.2 (2)
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• pp.395-397
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• 2000

영상 처리를 통한 수화(手話)의 인식에 있어 가장 중요한 정보는 손의 형상, 위치, 이동방향 등을 들 수 있다. 이 중 손의 형상은 세가지 정보 중 가장 중요하며, 실제로 자음과 모음, 숫자 등을 나타내는 지문자의 경우 손의 형상만으로도 인식될 수 있다. 본 논문에서는 선 처리 모델(Line Process Model)을 3차원으로 확장하여 적용한 Markov Random Field(MRF)를 사용하여 효율적으로 손의 형상을 추출하였다.

• 대한수의학회지
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• 제31권2호
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• pp.189-194
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• 1991

Getah virus is known as a causative agent of recognized febrile illness of horses characterized by fever, rash and edema. A serological survey indicated that hemagglutination inhibition antibody against Getah virus was detected in 34% of 464 racehorses from Korean Horse Affairs Association and 57% of 262 ponies from Cheju island, respectively. Several field strains of Getah virus isolated were from the racehorse that have been shown fever and febrile signs in 1989. The field isolates produced cytopathic effect in Vero, MA-104, BHK-21 cell cultures. Especially, they multiplied to the highest titer($10^6TCID_{50}/0.1ml$) in Vero cell cultures. When day-old mice were inoculated with field isolates by the intracerebral route, they showed a typical paralysis sign and died within seven days after inoculation. The guinea pig exhibited skin rash and edema, and died with neural signs after inoculation with the field isolates. In the cross neutralization test and indirect immunofuorescent assay, the field isolates were proved to be closely related to the Sakai strain of Getah virus antigenically.

• 대한전기학회논문지
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• 제43권7호
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• pp.1127-1134
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• 1994

The analytical model for the induced Hall field in the magnetotransistor considering the diffusion of carriers has been proposed and verified by experiment and simulation. Previous models for the induced Hall field in the magnetotransistor do not consider the influence of the diffusion carrier transport. However, the carrier diffusion in the base region of magnetotransistors cannot be neglected and should be considered to evaluated the Hall field in the magnetotransistors accurately. We have measured the Hall voltage in the base region of the fabricated magnetotransistors. The measured values have been compared with the numerical results evaluated from our diffusion model as well as the calculated results from the conventional model. The evaluated Hall voltage from the diffusion model agrees well with the measured values while the sign of the Hall voltage calculated by the conventional model is opposite to that of the measured values in the saturation region. This discrepancy is due to the fact that the diffusion model considers the carrier diffusion while the conventional one does not. The Hall field model including the influence of carrier diffusion may be an important tool to optimize the device structure and to understand the operating principle of the magnetotransistor.

• 한국전자통신학회논문지
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• 제13권1호
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• pp.221-228
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• 2018

빅데이터(Big data)는 제4차 산업혁명 시대를 맞이하여 과학, 기술, 산업, 사회분야에서 사물인터넷(IoT), 인공지능(AI), 클라우드(Cloud)와 더불어 공공분야와 민간분야를 아우르는 곳에서 중요한 키워드가 되고 있다. 빅데이터 기반의 서비스는 교통, 기상, 의료, 마케팅 등의 다양한 분야에서 제공되고 있다. 특히 스포츠 분야에서는 병원이나 재활센터가 아닌 훈련이나 일상 생활에서 생체 신호(Vital sign)를 측정할 수 있는 웨어러블 장치(Wearable device)의 등장으로 여러 형태의 생체 신호를 수집, 관리할 수 있게 되었다. 하지만 아직까지 스포츠분야, 즉 야구선수의 훈련(training)과 재활(rehabilitation)을 위한 웨어러블 장치에서 추출된 생체 신호를 가지는 빅데이터에 대한 연구가 활성화되지 못하고 있다. 따라서 본 논문에서는 야구선수에 대한 훈련, 특히 내야와 외야 수비선수에 대한 운동량 측정 생체신호를 빅데이터 기반으로 저장하고 분석할 수 있는 시스템에 대한 연구를 제안한다.

• 한국전자통신학회논문지
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• 제15권4호
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• pp.659-664
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• 2020

본 논문에서는 실리콘 기반의 광 집적회로에서 외부 전압 조절을 통해 |l|=1 궤도 각운동량 모드의 궤도 각양자수를 변조할 수 있는 전기 광학 변조기를 설계하였다. 설계된 전기 광학 변조기는 위치별로 서로 다른 도핑농도를 가지는 실리콘 코어와 실리콘 산화막으로 구성되어 있으며, 도핑농도의 분포를 통해 궤도 각운동량 모드를 구성하는 두 고유 모드의 전파 손실과 유효굴절률 변화량을 조절할 수 있도록 설계되었다. 변조기는 역전압을 기준으로 -0.33V에서는 궤도 각운동량 모드의 부호가 유지되는 광도파로로, 10V에서는 궤도 각양자수 부호 변환기로서 동작한다. 고유 모드 확장법으로 계산한 신호변조 후의 전기장 분포를 통해 얻은 궤도 각양자수는 두 동작모드에서 모두 |l|>0.92 으로 매우 높은 궤도 각운동량 모드 순도를 보였다.

• Advances in nano research
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• 제9권1호
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• pp.33-45
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• 2020

Geometrically nonlinear buckling of functionally graded magneto-electro-elastic (FG-MEE) nanoshells with the use of classical shell theory and nonlocal strain gradient theory (NSGT) has been analyzed in present research. Mathematical formulation based on NSGT gives two scale coefficients for simultaneous description of structural stiffness reduction and increment. Functional gradation of material properties is described based on power-law formulation. The nanoshell is under a multi-physical field related to applied voltage, magnetic potential, and mechanical load. Exerting a strong electric voltage, magnetic potential or mechanical load may lead to buckling of nanoshell. Taking into account geometric nonlinearity effects after buckling, the behavior of nanoshell in post-buckling regime can be analyzed. Nonlinear governing equations are reduced to ordinary equations utilizing Galerkin's approach and post-buckling curves are obtained based on an analytical procedure. It will be shown that post-buckling curves are dependent on nonlocal/strain gradient parameters, electric voltage magnitude and sign, magnetic potential magnitude and sign and material gradation exponent.

• 대한한의학회지
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• 제23권4호
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• pp.73-90
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• 2002

Objectives: This study investigated significant factors that influence functional evaluation of stroke so as to be a fundamental data for estimating prognosis of stroke patients. Methods: 204 patients were studied within 7 days of admission, after the diagnosis of stroke through brain CT scan, brain MRI scan and clinical observations. They were hospitalized in the oriental medical hospital of Dongeui University from February to July in 2001. They were examined at the early stage of onset, after 2 weeks, 4 weeks and 6 weeks, and measured for average mark and the degree of improvement by using the Activity Index. Results: Ischemic stroke, past history of stroke, hypertension, diabetes mellitus, risk factor of obesity, non-professional emergency treatment and hospitalizing time after 1 day from onset, high blood pressure, tachycardia pulse and high blood sugar in abnormal vital sign in acute stage, conscious, cognitive or communication disorder, motor aphasia, dysphagia, constipation for more than 3 days, urinary incontinence, visual field defect, insomnia, and chest discomfort in early stage of onset had a negative influence on functional evaluation. Conclusions: Type of stroke, past history, risk factors, emergency treatment and hospitalizing time after onset, abnormal vital sign and intercurrent symptoms in Acute stage were relevant factors in predicting functional evaluation of stroke.

• 한국실내디자인학회논문집
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• 제14권3호
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• pp.103-113
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• 2005

As today's cultural environment entered the information society, one of the biggest trends of future is the interests of nationalism. The purpose of this study is to interpret interrelation between sign and space design and analyze Korean contemporary space how to universalize traditional conception and attitude in design. The process of this study is illustrated as follows: At first, this study contains basic concepts and theories of semiotics and discusses the possibilities of semiotic approaches in spatial designs. Since the most outspoken theorist in this field can be found in writings of C.S. Peirce, American philosopher, the theoretical basis for this research Is taken from the Peirce's Semiotics. Secondly, this research tries the conceptual approaches based on traditional thoughts of Koreans formed with the philosophic background occurred with the universe, religion and the nature. And then, it approaches for the typical characteristics of Korean traditional space to interpret the meaning and adopt the triadic structure of sign. The structure is classified in status, icon, index, and symbol to analyze the Korean contemporary space design. Finally, it examines the expression structure of the nature of Korea that is succeeded in contemporary space design as the semiotic analysis of the application examples ; and studies the examples that try to set and solve the concept of space in modern society as the real issues in our cultural situations.

• 한국농촌건축학회논문집
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• 제18권3호
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• pp.25-34
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• 2016

The purpose of this study is to investigate installation status of information facilities and condition of walking road influencing to psychological safety of walking tourists. For this purpose, four roads for walking tour are selected; the course no. 16 of Jeju Olle Trail, Sarabong Byeoldobong walkway in Jeju and the course no. 8 of Bougil, Gyeongpo Lake walkway in Gangneung. Facilities installed on roads for walking tour are classified into four facilities; safety facility, information facility, amenity facility, local cultural facility. In order to consider installation status of information facilities and condition of walking road influencing to psychological safety of walking tourist, a field experiment was conduced focusing on the course no. 16 of Jeju Olle Trail. Thirteen cases were happened as confusing situation while walking tour. Of the 13 cases, the situation of being lost and wandering on the trail accounted for six cases. In contrast to the expectation that the situation of being lost and wandering would occur only at a crossroads, it is not that such situation took place at specific places like a crossroads or where direction signs were inaccurate. Walking tourists of this field experiment also confronted situations of having lost confidence about continuing the ongoing direction, of having anxiety over walking a walking trail, of feeling discomfort caused by walking and of being offended by uncomfortable or messy areas of walking trial. These confusing situations are happened inappropriate installation of direction sign, so direction sign is needed to install more carefully and detailed.