• Journal of fish pathology
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• v.15 no.3
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• pp.117-119
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• 2002

A kind of leeches, Trachelobdella sp was detected on the inside surface of the opercle of wild crucian carp, Carassius cuvieri (21.5 cm in length and 238.5 g in weight) at a reservoir for agriculture in ChungNam Province of Korea in March, 2002. Two or three round transparent spots on the opercle could be easily detected. The fish also showed severe anemia and dorsally darking in the gill lamellae. The parasites was identified as Trachelobdella sp. on the basis of morphological characteristics such as suckers, body segmentation and lateral diverticula. As the parasites fed on host blood after attaching on the inside surface of the opercle by means of the posterior sucker, they caused severe anemia and petechial haemorrhge on the gill of infested fish. Heavy infestation of the parasite resulted in dath of fish because of large amount of blood loss.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.02a
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• pp.182-190
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• 2004

An unique extraction chromatographic column (TOA: Tri-n-octylamine on Teflon powder) with a two-stage sample loading was prepared to separate Np and Pu from the environmental matrix. Np and Pu were efficiently retained in 4 M $HNO_3$ medium on the column and easily eluted with 0.02 M oxalic acid in 0.16 M HNO$_3$at $95^{\circ}C$. The separated solutions were free from most of the matrix elements and were aspirated into the ICP-MS directly. The decontamination factor for 238U is more than 104. The instrumental detection limit for 237Np was 0.46 pg mL-l ($1.2{\times}10_{-5}$Bq mL-l), and for 239Pu was 0.48 pg mL-l ($1.1{\times}10_{-3}$ Bq mL-l). The feasibility for the determination of both elements was proved by analysing IAEA-135 reference samples, the measured values agreed with the recommended reference value.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.238-240
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• 2017

파랑 중 선수파의 영향을 줄이기 위해 도입된 Axe Bow선형은 파랑 중 항해 시 선수부에 과도한 Spray현상이 발생한다. 이를 억제하고자 선수 부가물이 도입되었으나, 수치해석적 연구가 필요할 것으로 판단하였다. 선수 부가물은 Spray rail에서 착안하였으며, 구현이 쉽고 설계 파라미터를 제시 할 수 있는 Barge형상으로 적용하였다. 본 연구에서는 선수 부가물의 길이 변화에 따른 Axe Bow 선형의 Spray 억제를 수치해석적으로 고찰하였다.

• Nuclear Engineering and Technology
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• v.46 no.3
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• pp.299-312
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• 2014

An uncertainty propagation methodology based on the Monte Carlo method is applied to PWR nuclear design analysis to assess the impact of nuclear data uncertainties. The importance of the nuclear data uncertainties for $^{235,238}U$, $^{239}Pu$, and the thermal scattering library for hydrogen in water is analyzed. This uncertainty analysis is compared with the design and acceptance criteria to assure the adequacy of bounding estimates in safety margins.

• Journal of the Korea Institute of Military Science and Technology
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• v.1 no.1
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• pp.238-248
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• 1998

This paper presents an image analysis method for mearurement correction using the object contour based analysis, which measure the shape features of the imitation missile object. The image analysis is divided into object's tilting angle analysis and corner points detection. The tilting angle is calculated by edge extracting the region-of-interest image and by Radon transform it. The corner points are obtained by contour tracking of binary image and its curvature data processing and analysis. The ability of this presented method is simulated and evaluated by the results of accuracy testing.

• Journal of Radiation Protection and Research
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• v.26 no.3
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• pp.183-190
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• 2001

The activity concentration of primordial radionuclides i.e., $^{238}U$ series, $^{232}Th$ series and $^{40}K$, in soil samples collected from Udagamandalam environment, have been measured by employing NaI (Tl) Gamma ray Spectrometer. The absorbed gamma dose rate has also been simultaneously measured by using both Environmental Radiation Dosimeter at each soil sampling location (ambient gamma dose) as well as from the gamma dose derived from the activity concentration of the primordial radionuclides. The results of activity concentration of each radio nuclides in soil, absorbed dose rate in air due to soil activity and possible cosmic radiation at each location along with human effective dose equivalent for Udagamandalam environment are presented and discussed.

• Proceedings of the ESK Conference
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• 1996.10a
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• pp.238-243
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• 1996

Grip strength is a very important basic data for ergonomic design of hand tools, grips, handles and etc.. Excessive grip strength is contineously exerted to handle the machines or tools, it might cause a musculoskeletal disorder such as cumulative trauma disorders. Capal tunnel syndrome is a typical nerve disorder anomg CTDs. In this paper we have measured the grip strength under sitting and standing posture for Korean adults ; 113 male and 105 female aged from 20' to the above 50' . And this paper performed statistical analysis for driving out characteristics between grip strength and anthropometric data. The results are as follows ; (1) The maximum girp strength is exerted under standing posture with the elbow in full extension(180 .deg. ) for both of male and female (2) There is significant difference in posture, sex and right left hand (3) Grip strength decreases with age for male, but it traces an inverted U curve for female (4) Grip strength has a correlation with age, weight, height, BSA, forearm length, hand length, thickness of wrist, circumference of wrist and breadth of wrist for male

• 한국벤처창업학회:학술대회논문집
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• 2016.04a
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• pp.235-238
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• 2016

디지털 콘텐츠의 한 형태로 볼 수 있는 앱은 개발자들의 창의적 사고를 바탕으로 현재도 무수히 쏟아져 나오고 있으며, 많은 사용자로부터 선택되어 활용되고 있다. 이러한 변화는 교육분야에도 영향을 주어 앱을 활용한 교육환경과 교육방법에 대한 다양한 연구가 현재 진행되고 있다. 앱과 같은 디지털 콘텐츠의 개발은 창의적 아이디어를 기반으로 구현되며 이는 콘텐츠 사용자의 유용성과 경제적 가치를 결정하는데 중요한 요소로 작용하고 있다. 이러한 창의와 디지털 기술을 접목한 앱 프로그래밍 교육은 학생들의 창의적 사고와 문제해결력을 향상시키는데 중요한 역할을 하며 특히 교육용 프로그래밍 언어(EPL, Educational Programming Language)를 활용한 코딩 교육과 창의적 문제해결력 향상에 관한 관련 연구들이 활성화되고 있는 실정이다. 본 연구에서는 이러한 EPL을 바탕으로 비IT계열 전공의 대학생들에게 프로그래밍 교육을 실시하고 창의적 사고를 통해 디지털 콘텐츠인 앱을 제작하는 것에 초점을 두기 위한 안드로이드 앱제작 교육 프로그램 개발을 진행하였다. EPL을 위한 도구는 MIT 미디어랩에서 개발한 클라우드 기반의 안드로이드용 앱 인벤터2(App Inventor 2)를 사용하며, 제작한 앱을 스마트 기기에서 즉시 실행하고 확인할 수 있다는데 대해 학습만족도와 성취감이 높음을 수업관찰을 통해 확인할 수 있었으며 제작 과정에서도 활발한 사고력를 발휘하는 것을 확인할 수 있었다.

• Proceedings of the Korean Society of Medical Physics Conference
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• 2002.09a
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• pp.501-505
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• 2002

The specific radioactivity concentrations of $\^$238/U, $\^$232/Th, $\^$40/K were measured in soil samples around Zuunmod town of Mongolia using HP-Ge gamma-spectrometer. Also the specific radioactivity concentrations of above elements were measured in coal and ash samples which were collected from the Central steam heating in Zuunmod town. It was determined the effective equivalent dose.

• Mass Spectrometry Letters
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• v.7 no.4
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• pp.102-105
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• 2016

This study explored the feasibility of using a carburization technique to enhance the ion intensity of isotopic analysis of ultra-trace levels of uranium using thermal ionization mass spectrometry (TIMS). Prior to fixing uranium samples on TIMS filaments, graphite powder suspended in nitric acid was deposited on rhenium filaments. We observed an enhancement of $^{238}U^+$ intensity by a factor of two when carburization was used, and were able to roughly optimize the amount of graphite powder necessary for carburization. The positive shift in heating current when evaporating filaments upon carburization implies that uranium was chemically altered by carburization, when compared to normal fixation processes. The good agreement between our method and known standards down to an ultra-trace level shows that the proposed technique can be applied to isotopic uranium analysis down to abundances of ~10 pg.