• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1427_1428
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• 2009

In this paper, we designed and fabricated the ubiquitous thermal sensor unit for high voltage facilities. This sensor unit generates electric power from a current transformer which was mounted in the high voltage wires and transmitted thermal data by using a Zigbee module. We simulated the high voltage facilities that temperature was going up to $80^{\circ}C$ gradually. From the experimental results, it was confirmed that sensibility of the ubiquitous thermal sensor unit is in ranges from $-0.7^{\circ}C$ to $0.3^{\circ}C$.

• 대한수학회논문집
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• 제12권2호
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• pp.479-490
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• 1997

We consider long nonlinear waves in the two-layer flow of an inviscid and incompressible fluid bounded above by a free surface and below by a rigid boundary. The flow is forced by a bump on the bottom. The derivation of the forced KdV equation fails when the density ratio h and the depth ratio $\rho$ yields a condition $1 + h\rho = (2-h)((1-h)^2 + 4\rho h)^{1/2}$. To overcome this difficulty we derive a forced modified KdV equation by a refined asymptotic method. Numerical solutions are given and hydraulic fall solution of a two layer fluid is expressed analytically in the case that derivation of the forced KdV (FKdV) equation fails.

• Clinical and Experimental Pediatrics
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• 제51권5호
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• pp.457-461
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• 2008

Kawasaki disease (KD) was first described by Dr. Tomisaku Kawasaki in his 1975 study, published in Pediatrics. Its pathogenesis is still not clearly understood. Early diagnosis and treatment are very important to preventing concomitant coronary artery complications. Most KD patients respond well to the standard treatment of aspirin and intravenous immunoglobulin; however, some of them are refractory to the standard treatment, and so adjuvant therapies with corticosteroids and anti-tumor necrosis $factor-{\alpha}$ ($TNF-{\alpha}$) antibody are necessary. In this article, the author reviews and summarizes the most recent literature on the treatment of refractory KD.

• 한국전산유체공학회지
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• 제2권1호
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• pp.129-137
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• 1997

We consider long nonlinear waves in the two-layer flow of an inviscid and incompressible fluid bounded above by a free surface and below by a rigid boundary. The flow is forced by a bump on the bottom. The derivation of the forced KdV equation fails when the density ratio h and the depth ratio ρ yields a condition 1＋hρ=(2-h)((1-h)²＋4ρh)/sup 1/2/. To overcome this difficulty we derive a forced modified KdV equation by a refined asymptotic method. Numerical solutions are given and hydraulic fall solution of a two layer fluid is expressed analytically in the case that derivation of the forced KdV(FKdV) equaition fails.

• Radiation Oncology Journal
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• 제6권1호
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• pp.101-108
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• 1988

The beam characteristics and dosimetric measurements of the 10MV X-ray beam from a Mevatron KD linear accelerator are examined. The Percent Depth Dose (POD) table and the Tissue Maximum Ratio (TMR) table are taken from measurement as a function of the field size and the depth. The calculated TMR table from PDD table is compared with those from measurement. Other beam characteristics such as output factor, beam profile (including flatness, symmetry and penumbra), wedge, and the variation of Dmax are presented.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.1855-1858
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• 2003

In this paper, we propose image retrieval method more accurate and efficient than the conventional one. First of ail, we perform a shot detection and key frame extraction from the DC image constructed by DCT DC coefficients in the compressed video stream that is video compression standard such as MPEG[I][2]. We get principal axis applying PCA(Principal Component Analysis) to key frames for obtaining indexing information, and divide a domain. Video retrieval uses indexing information of high dimension. We apply KD-Trees(K Dimensional-Trees)[3] which shows efficient retrieval in data set of high dimension to video retrieval method. The proposed method can represent property of images more efficiently and property of domains more accurately using KD-Trees.

• 한국수소및신에너지학회논문집
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• 제21권1호
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• pp.12-18
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• 2010

Photobiological hydrogen production using Rhodobacter sphaeroides KD131 was studied on the effect of light intensities and nitrogen sources. Media containing malate and glutamate were shown higher hydrogen production rate than that containing succinate and $(NH_4)_2SO_4$ at the $110\;W/m^2$ illumination by halogen lamp at $30^{\circ}C$. Media lacking glutamate as the nitrogen source exhibited higher hydrogen production than that containing glutamate. Initial cell concentration was optimized to 1.0 at the absorbance of 660 nm. Hydrogen production was increased by increasing the light intensity from 0 to $216\;W/m^2$ but the increasing rate declined over $108\;W/m^2$.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.866-867
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• 2015

화재 및 인명사고의 약 40%이상이 아크플래시사고로 인한 원인으로 밝혀지고 있다. 이에 아크 플래시 발생으로 인한 2차 사고 방지가 산업 경제적 측면에서 중요하다고 판단하여 본 연구에서는 초고속자외선 검출 시스템을 구현하였다. 아크 플래시 신호를 광파이버 포인트 센서 및 광섬유 루프센서를 이용하여 초고속 광검출 및 고속 신호처리 컨트롤러를 이용해 차단기 트립 개시 신호 출력까지 시간을 1.5ms 이내로 출력하는 것을 목표로 하였으며 테스트베드를 통해 구축한 시스템에서 아크 발생 후 소요시간 약 1ms의 트립 개시 신호를 출력하는 초고속 아크 검출 시스템을 개발하였다.

• 대한수의학회지
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• 제32권4호
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• pp.585-595
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• 1992

We have investigated the characteristics of encephalomyocarditis(EMC) virus isolated in Korea. The CPE, buoyant density, polypeptide profile and the size of RNA of EMC virus were examined. The granulation, pyknosis and necrosis were observed from 30 to 48 hour's post inoculation of the virus into baby hamster kidney and lung cells. The buoyant density was 1.30 and $1.35g/m{\ell}$. Three different polypeptides, 26Kd, 32Kd, and 34Kd in size, were observed and the size of viral RNA was 7.7Kb.

• 전기학회논문지
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• 제56권8호
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• pp.1351-1359
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• 2007

In this paper, we have studied the power quality(PQ) diagnosis system with the two methods for PQ diagnosis. One to Apply a regulation value in compliance with mathematics calculation, and the other Automatic identification using Neural network algorithm. Neural network algorithm is used for an automatic diagnosis of the PQ. The regulation proposed by IEEE 1159 Working group is applied for the precision of the diagnosis. In order to divide accurate segmentation, the algorithm for a computer training used the back propagation out of several neural network algorithms. We have configured the proto-type sample by using Labview and a programmed Neural Networks Algorithm using with C. And arbitrary electric Signal generated by OMICRON Company's CMC 256-6 for an efficiency test.