• 복식
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• 제56권6호
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• pp.145-152
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• 2006

Dyeing properties of sargent cherry of Prunus sargentii Rehder were investigated with silk fabrics. The absorbed wave lengths at UV-VIS spectrometer were 362nm, 386nm, 430nm, and 512nm. The K/S value showed high in following conditions: 100%(w/w) stock solution, 60 minutes of dyeing time, 80$^{\circ}C$ of dyeing temperature, and 5 times of dyeing repetition. The K/S value showed higher in post-mordant than in pre-mordant, and the change of color did not appear in pre-mordant samples. They were colored greenish yellow in post-mordanted Cu and Fe. The highest dyeability and $\Delta$E showed in post-mordanted Fe. The light fastness showed 3-4 in post-mordanted Fe, 1-2 in pre-mordanted Al, and washing and perspiration fastnesses showed also good results in post-mordanted Fe.

• 한국구조물진단유지관리공학회 논문집
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• 제2권3호
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• pp.176-187
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• 1998

The Dismantlement and Construction of the buildings have the characteristic of floating change with repetition within a Time Schedule which has fixed resources, that is, Manpower, Materials and Equipments, and involve many disaster factors in performing each processes. But as these factors are variable, a work supervisor should be able to understand data analysed distinctive factors of each activities systematically, organizationally, and scientifically, and diagrammatic information media so that he can control any complex and situation beyond forecast. Thus this study is intended to be a barometer of weighing if the existing process schedule has taken security into consideration by making the characteristics of organization and action of Work package per process in a building field with more factors like these into a network system and is intended to minimize construction disasters by systematizing this into a Transformational Network.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2018년도 추계 학술논문 발표대회
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• pp.138-139
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• 2018

The purpose of this study is to analyze the work of the existing manpower dependent cleaning method by investigating the window cleaning site. In this study, detailed work contents were confirmed by on-site investigation and interview with experts, and the relationship, procedure, repetition work, and time required for each work were analyzed. The future analysis results will be used as a basic data for comparative analysis of productivity and economical efficiency with the window cleaning device to be developed.

• 대한인간공학회지
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• 제1권2호
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• pp.17-23
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• 1982

Application of color coding to a jack board-type display has not yet been tried. The purpose of this paper is to study the effects of color coding on a jack board-type display. Ten subjects searched 10*20 arrays of numbers for the presence or absence of a color coding. Five colors were used for the coding. Three subjects were selected among 10 subjects to repeat 11 times the above experiments. Detection time was reduced by 6.6% for the color coding condition. Three subjects did not show any results different from those in their inexperienced state, except the learning effect during repetition of the experiments. The results imply that the color coded jack board-type display may be efficient either to inexperienced subjects or to experienced subjects.

• ETRI Journal
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• 제31권2호
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• pp.237-239
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• 2009

A whole-body voxel model of a 7-year-old male volunteer was developed from 384 axial magnetic resonance images (MRIs). The MRIs were acquired with intervals of 3 mm for the entire body in a body coil. In order to reduce the MRI acquisition time for the child, the repetition and echo times under T1 weighted image were chosen to be 566 ms and 8 ms, respectively. The MRIs were classified according to 30 types of tissues with known electrical parameters. The developed voxel model was adjusted to the physical average of 7-year-old Korean boys. The body weight of the adjusted model, calculated with the mass tissue densities, is within a 6% difference from the 50th percentile weight.

• 한국광학회지
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• 제10권3호
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• pp.243-247
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• 1999

정현파로 구동되는 위상변조기로 주파수 첩이 유기된 펄스를 발생시키고, 이 첩이 유기된 펄스를 분산이 있는 광섬유로 압축하는, 첩된 펄스의 압축에 의한 고속의 선천적으로 안정된 변환 제한급 광펄스 발생에 대해 보고한다. 실험결과 ∼14 피코초의 시간 대역곱이 ∼0.34인 Sech2 형태의 펄스를 10 GHz의 반복율로 성공적으로 발생시킬 수 있음을 보였다. 본 접근 방법은 고차 솔리톤 효과를 이용한 펄스 압축과 같은 여타 방법과는 다르게 광전력에 무관하기 때문에, 저 전력 레이저에 아주 유용하게 응용될 수 있다.

• 한국철도학회논문집
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• 제7권4호
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• pp.307-311
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• 2004

Arresters are the best protective device on electrical power systems against transient overvoltages generated by lightning and/or switching operation. Nonetheless, arresters are deteriorated by absorption of moisture in the environments of its use, repetition in the protective operation to overvoltages, and some defects at manufacturing. It is therefore important to estimate the electrical characteristic changes of ZnO blocks. In this paper, an accelerated ageing test by a standard lightning impulse current was carried out to extract parameters needed for arrester diagnosis, and leakage current components were measured. Total energy applied to the ZnO blocks at each time is about 1,050[J] in 8/20[${\mu}\textrm{s}$] impulse current. From the experimental results, we proposed electrical parameters and leakage current level to diagnose arrester soundness.

• 패션비즈니스
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• 제17권4호
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• pp.140-148
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• 2013

This research was carried out to find the dyeabilities and mordants effects of cow leather dyed with Lac powder. They were examined by changing dye concentration, dyeing temperature, bath ratio, dyeing time, and dyeing repetition. And K/S values and surface color changes were evaluated by various mordanting conditions. The optimum dyeing conditions of the cow leather dyed with Lac powder were 30%, $40^{\circ}C$, 30:1, 30minutes, and 4 repetitions. The K/S values were higher in post mordant than pre mordanting condition. The surface colors of dyed cow leathers were R and RP. The dye fastnesses increased in post Cu and Fe mordanting, as decreased in gallnut and chestnut's skin conditions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2143-2145
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• 2005

Power semicondcutor인 IGBT MOSFET, GTO, SI-Thyristor등은 높은 스위치 신뢰성과 life time, 그리고 fast repetition rate 등을 지니고 있기 때문에 medium/High voltage영역에서 스위치 사용이 대두되어 왔으나, Thyratron이나 Trigatron(Gap switch)와 비교하여 낮은 전압/전류를 스위칭하기 때문에 전통적으로 직렬연결을 통해 high voltage 영역의 스위치로 사용되어 왔다. 하지만, 직렬연결되어 있는 각각의 power semiconductor와 gate driving circuit의 on/off synchronization이 맞지 않기 때문에 부하의 급격한 변화에 따른 전압의 balance에 문제가 가장 심각하게 대두되어 왔다. 이러한 문제를 해결하기 위해서 gate driving circuit에서 제어를 해주는 방법과 power semiconductor에서 제어를 해주는 방법이 있으나 두 방식 모두 문제점이 있다. 본 논문에서는 기존의 zener clamping방식에서 벗어나 새로운 active clamping방식의 직렬연결을 제안했으며 시뮬레이션과 실험을 통해 나타난 이 결과들은 on/off transient 시 symmetry를 유지하는데 효과적이라는 것을 보여주고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 A
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• pp.460-463
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• 1993

In this paper, The laser transmitter module is designed as the subsystem of the high repetitive laser rangefinder. The module consists of high voltage power supply, high voltage control circuits, high voltage discharger, electro-optic Q-switch driver, and laser resonator. The high voltage power supply is composed of 2-phase flyback converter. And it has 220W power level and 78% conversion efficiency. From the Q-switch driver of the crossed porro resonator, the phase retardation voltage is switched from 600V to -1500V with 200ns falling time. The module can be operated up to 15Hz. And it generates the laser pulse which has 20ns width and 80mJ.