• 한국통신학회논문지
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• 제11권4호
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• pp.241-250
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• 1986

안테나 해석 및 설계에 있어 전류분포는 그 기본을 이루고 있다. 본 연구에서는 가는 도체를 평면상에 감은 나선형 산란체에 평면파가 입사한 경우의 나선형 도체의 전류분포를 적분방정식을 세워서 구하는 방법을 제시하고, 나선형 산란체의 길이(회전수)와 입사파의 입사각을 바꾼 경우의 전류분포를 계산한 결과를 제시하였다 수치 해석으로는 기저 함수로 Cubic B-Spline 함수를 이용한 Point matching 방법을 적용하였다.

• 한국광학회지
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• 제14권4호
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• pp.399-405
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• 2003

FD10 유리를 이용한 클램프형 광전류 센서를 제작하였다. 대칭형 구조로 이루어진 2조각의 FD10유리를 이용하여 제작하였으며, 센서헤드 내부에서 반사시에 위상차가 발생하는 것을 방지하기 위해 정확히 임계각으로 광이 진행하도록 구조를 설계하였다. 제작한 광-전류 변류기 헤드를 이용하여, 0-1,000 AT 까지의 전류를 측정하고, 빛의 입사각에 따른 광의 손실, 입사광의 편광회전에 따른 광출력변화, 온도에 따른 출력의 변화 및 장시간 전류 측정 등에 대한 실험결과를 제시하고 이에 대한 분석을 통해 제작된 광전류 변류기 헤드의 전류계로서의 가능성을 입증하였다.

• The Plant Pathology Journal
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• 제33권5호
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• pp.467-477
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• 2017

A nationwide survey was performed to investigate the current incidence of viral diseases in Korean sweet potatoes for germplasm and growing fields from 2011 to 2014. A total of 83.8% of the germplasm in Korea was infected with viruses in 2011. Commercial cultivars that were used to supply growing fields were infected at a rate of 62.1% in 2012. Among surveyed viruses, the incidence of five Potyvirus species that infect sweet potato decreased between 2012 and 2013, and then increased again in 2014. Representatively, the incidence of Sweet potato feathery mottle virus (SPFMV) was 87.0% in 2012, 20.7% in 2013 and then increased to 35.3% in 2014. Unlike RNA viruses, DNA viruses were shown to decrease continuously. The incidence of Sweet potato leaf curl virus (SPLCV) was 5.5% in 2003, 59.5% in 2011, and 47.4% in 2012. It then decreased continuously year by year to 33.2% in 2013, and then 25.6% in 2014. While the infection rate of each virus species showed a tendency to decline, the virus infection status was more variable in 2013 and 2014. Nevertheless, the high rate of single infections and mixed infection combinations were more variable than the survey results from 2012. As shown in the results from 2013, the most prevalent virus infection was a single infection at 27.6%, with the highest rate of infection belonging to sweet potato symptomless virus-1 (SPSMV-1) (12.9%). Compared to 2013, infection combinations were more varied in 2014, with a total of 122 kinds of mixed infection.

• 한국가금학회지
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• 제20권1호
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• pp.17-31
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• 1993

Several aspects about the epidemiological status of chicken coccidiosis, its control measures and recent research activities in Korea are discussed in this paper. Medication with different available anticoccidial drugs has been reasonably effective in treating and preventing serious outbreaks of coccidiosis in chicken, but the disease remains one of the most expensive and common diseases of popultry production in this country, and more recently its incidence is increasing, possibly due to the more intensive methods of husbandry and the immergence of resistant strains of coccidia. Therefore, this necessitates a continuous search for new methods such as medication program (shuttl and rotation program) and immunization using attenuated strains or parasite antigens.

• 대한기관식도과학회지
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• 제4권2호
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• pp.258-261
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• 1998

Most laryngeal carcinomas are squamous cell carcinomas. Adenocarcinoma of the larynx is rare, its incidence has been reported less than 1% of all laryngeal neoplasms. Adenocarcinoma arises from glandular structures of the larynx and usually arises from the supraglottis. Compared to other carcinoma, deep biopsy and aggressive treatment is manditory. We report a case of adenocarcinoma of the larynx with review of current literatures.

• Archives of Pharmacal Research
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• 제1권1호
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• pp.41-54
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• 1978

Aspirin is one of the oldest synthetic drugs and remains the most widely used medical agent. It is a household remedy effective in treating such common ailments as headache, minor muscular pain and fever. Aspirin is the drug choice for rheumatic fever and arthritis which some five million Americans suffer. Lately it has been established by double-blind and randomized clinical studies that regular aspirin intake reduces the incidence of mild strokes and heart attackes.

• Clinics in Shoulder and Elbow
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• 제22권4호
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• pp.235-240
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• 2019

Ulnar collateral ligament injuries of the elbow are frequent among overhead athletes. The incidence of ulnar collateral ligament reconstructions (UCLRs) in high-level players has increased dramatically over the past decade, but the optimal technique of UCLR is controversial. Surgeons need to manage the patients' expectations appropriately when considering the mode of treatment. This article reviews current studies on the management of ulnar collateral ligament injuries, particularly in overhead athletes.

• Journal of Biosystems Engineering
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• 제37권1호
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• pp.11-18
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• 2012

Purpose: Short-circuit current of a solar module that is widely used as a power source for wireless environmental sensors is proportional to solar radiation although there are a lot of factors affecting the short-circuit current. The objective of this study is to develop a model for estimating solar radiation for using the solar module as a power source and an irradiance sensor. Methods: An experiment system collected data on the short-circuit current and environmental factors (ambient temperature, cloud cover and solar radiation) during 65 days. Based on these data, two linear regression models and a non-linear regression model were developed and evaluated. Results: The best model was a linear regression model with short-circuit current, angle of incidence and cloud cover and its overall RMSE(Root Means Square Error) was 66.671 $W/m^2$. The other linear model (RMSE 69.038 $W/m^2$) was also acceptable when the cloud cover data is not available.

• Corrosion Science and Technology
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• 제17권6호
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• pp.292-300
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• 2018

The modeling of 3D finite elements based on CAD data has been used to detect sites of corrosion defects in buried pipes. The results generated sophisticated profiles of electrolytic potential and vectors of current distributions on the earth surface. To identify the location of defects in buried pipes, the current distribution on the earth surface was projected to a plane of incidence that was identical to the pipe locations. The locations of minimum electrolytic potential value were found. The results show adequate match between the locations of real and expected defects based on modeling. In addition, the defect size can be calculated by integrating the current density curve. The results show that the defect sizes were $0.74m^2$ and $0.69m^2$, respectively. This technology may represent a breakthrough in the detection of indirect damage in various cases involving multiple defects in size and shape, complex/cross pipe systems, multiple anodes and stray current.

• 한국유체기계학회 논문집
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• 제13권2호
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• pp.36-40
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• 2010

Tidal current power system is the energy converter which converts the kinetic energy of tidal stream into electric energy. The performance of the rotor which initially converts the energy is determined by various design factors and it should be optimized by the ocean environment of the field. Flow direction changes due to rise and fall of the tides, but horizontal axis turbine is very sensitive to direction of flow. To investigate the rotor performance considering the interaction problems with incidence angle of flow, series of experiments have been conducted. The results and findings are summarized in the paper.