• 수산해양기술연구
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• 제21권2호
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• pp.89-98
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• 1985

As a primary step in studying the effects of the netting porosity on the net-shape in the four-seam trawling net, a series of experiments were performed changing the porosity of each panel, with the simplified mo:iel of the bag net made of porous vinyl film and that ma:ie of net webbing. These models were suspended horizontally in circularly flowing water, with two pairs of susp~nding threais to four points of symetry at the border of the bag mouth in place of both wing nets. And then, the section shape of the bag mouth photographed and the tensions on both pairs of suspending threads were measured with two load cells in circularly flowing water. From the results, the auther estimated an experimental equation from the relationship between the porosity of each panel in the bag net and the section shape of the bag mouth, h/w=k (l-Pr_u/lPr_s)

• 한국전자파학회논문지
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• 제30권4호
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• pp.300-306
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• 2019

얇은 도체 평판에 소형 리지 원형 개구, H-형태 개구, U-형태 개구, 예루살렘 십자형 개구와 같은 다양한 투과 공진 개구에 대하여 개구 모양에 무관하게 투과 단면적은 해석적으로 $2G{\lambda}^2/4{\pi}$로 주어지게 된다. 이러한 표현식에 대해 MOM 방법을 사용하여 계산한 결과와 비교하여 일치함을 확인하였다. 또한 두꺼운 도체 평판 내에 투과 공진기 구조에 대해 투과 단면적을 연구했으며, 투과 효율 관점에서 이들 두 소형 개구 구조 간에 동등함을 보였다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2007년도 춘계학술대회 논문집
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• pp.417-420
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• 2007

Micro parts are usually used of producing by micro-electro-mechanical systems(MEMS). In this paper, we present some fundamental results concerning on the MEMS, extrusion condition on the micro forming characteristics and new micro forward extrusion machine has been developed. In the first step, we manufactured micro dies in two kinds of sections. One is a circle section, another is a cross section. The process for fabricating micro dies combines a deep UV-lithography, anisotropic etching techniques and metal electroplating with bulk silicon based on Ni with a thickness of $50{\mu}m$. The outer diameter of Ni-micro dies is 3mm and the diameter of extrusion section is $270{\mu}m$ for a cross section, $500{\mu}m$ for a circle section. The low linear density polyethylene(LLEPD) in the shape of a pellet has been used of micro extrusion. The billet was placed in a container manufactured by electric discharge machining and extruded through the micro die by a piezoelectric actuator. The micro extrusion has succeeded in a forming such micro parts as micro bars, micro cross shafts.

• 전기학회논문지
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• 제67권3호
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• pp.467-473
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• 2018

R-Bar(Overhead Rigid Conductor system) is being developed for the high-speed in Europe because it has an advantage of cross section area reduction of tunnel compared with OCS (Overhead Catenary Line). Because there are lots of underground sections and mountains in korea, it is necessary to develop the R-Bar for a high-speed line. In this study, a method on speed-up of transition section between OCS and R-Bar is proposed. The commercial program, DAFUL, is used to predict a dynamic characteristics between Overhead Line and pantograph. The program is evaluated according to EN 50318 which is the European Norm for evaluation of the program. Using the evaluated modeling and method, a method for the max. speed of 250 km/h of transition section is proposed.

• Radiation Oncology Journal
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• 제2권2호
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• pp.303-309
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• 1984

Radiation therapy(RT) has been used in the treatment of breast cancer for over 80years. Technically, it should include a part or all of such areas as chest wall or breast, axilla, internal mammary nodes (IM) and supraclavicular nodes (SCL). Authors tried three-field technique for the treatment of breast cancer using 6-MV linear accelerator, exclusively the department of radiology. Kang-Nam St. Mary's Hospital, at Catholic Medical College. The field junction was checked by a Phantom study and radiation doses measured by film densitometry and TLD. The 3 fields we used in this study were two isocentric opposing tangential fields encompassing the breast, chest wall and occasionally IM and one single anterior field encompassing the axilla and SCL. sing appropriate beam blocks and boluses, we were able to avoid unwanted intrinsic divergency of photon beam. Blocking also enabled us to set-up precise radiation field with ease.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기설비전문위원
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• pp.71-74
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• 2005

At the neutral sections, There are neutral sections inserted in overhead contact line between the substations to divide different phase current sections of AC electrified lines. except convention line, a large stress occurs in the contact wire near the fittings under passing pantographs. So, in order to raise the train speed over 150km/h, a new type section has been adopted.

• Toxicological Research
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• 제4권1호
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• pp.47-53
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• 1988

Cholera toxin and dibutyryl cyclic adenosine 3', 5'-monophosphate(db-cAMP) increased the rate and number of infections units produced in the in vitro reactivation of latent herpes simplex virus, whereas adenosine diminished them. cAMP concentration in latently infected trigeminal ganglia of mice was greatly increased by cholera toxin but was not affected by adenosine.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2011년도 춘계학술대회 논문집
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• pp.883-884
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• 2011

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.294-301
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• 2008

At the neutral sections, There are neutral sections inserted in overhead contact line between the substations to divide different phase current sections of AC electrified lines. Except convention line, a large stress occurs in the contact wire near the fittings under passing pantographs. So, in order to raise the train speed over 150km/h, a new type section has been adopted.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2479-2486
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• 2011

Honam's high speed railway line that was designed as the most suitable with corresponding 350km/h for concrete track will be scheduled train operation in 2015. In this study, It was reviewed the performance level of standardized design section for the soil structure with 350km/h and also analyzed the demand level for roadbed structure corresponding with 400km/h speed up of HSR.