• Journal of Fashion Business
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• v.4 no.3
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• pp.47-65
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• 2000

The movie costume's function and the role can be defined by reflection of the society and the times, character portrayal, conveyance of image, and creation of fashion. Korean movie costumes have been differentiated from 1950s till 1990s in time period and the results of comparison between the times as follow : Movie and fashion hold same period in common so that sense of fashion is naturally contained in the movie costume. Therefore, excluding special movie that costumes are selected by designer, such kind of trend is notable in the times when costumes mostly selected by actors themselves. Most movie costumes are not designed after predicting up coming fashion by considering movie producing time so that notation between current fashion and fashion in the movie and mostly we see about one year behind fashion style. For FAD, fashion that quickly passes in each season can use costumes in fashion, considering movie producing time and time background, that it lack of trend of fashion in the movie. Korean movie industry lack of having perception of people who are in charge of taking care of movie so that costumes are not properly taken care of and uses only 5% of total movie producing cost. Such that kind having lack of preception and treatment of movie costumes can't expect development of movie costumes.

• Journal of the Korean Society for Precision Engineering
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• v.22 no.7 s.172
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• pp.62-70
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• 2005

The nanoindenter and AFM have been used for nanofabrication, such as nanolithography, nanowriting, and nanopatterning, as well as measurement of mechanical properties and surface topology. Nanoscale indents can be used as cells for molecular electronics and drug delivery, slots for integration into nanodevices, and defects for tailoring the structure and properties. Therefore, it is very important to make indents of desired morphology (shape, size and depth). Indents of different shapes can be obtained by using indenters of different geometries such as a cube comer and conical and spherical tips. The depth and size of indents can be controlled by making indentations at different indentation loads. However, in case of viscoplastic viscoelastic materials such as polymethylmethacrylate (PMMA) the time dependent deformation (TDD) should also be considered. In this study, the effect of process parameters such as loading rate and hold-time at peak load on the indent morphology (maximum penetration depth, elastic recovery, transient creep recovery, residual depth pile-up height) of PMMA were studied for hyperfine pattern fabrication.

• Journal of Industrial Technology
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• v.6
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• pp.19-31
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• 1986

The residence time distribution of liquid flow in a 4.0cm diameter column packed with porous $Al_2O_3$ spheres of 0.37cm diameter were measured with pulse injections of a tracer under cocurrent trickling flow conditions. The mean residence time of liquid flow and liquid hold-up calculated by the transient curve of tracer were unaffected by gas flow rates under experimental ranges of liquid flow rates from 2.4 to $4.5(kg/m^2\;sec)$ and gas flow rates from 0 to $0.13(kg/m^2\;sec)$. The axial dispersion coefficient of liquid stream and apparent diffusivity of tracer in a micropore of solid particle were estimated from the response curve of tracer. The calculated Peclet No. were increased in ranges of 68-to 82 with a increasing of liquid mass velocity, and the external effective contacting efficiency between liquid and solid which can be expressed. by $(D_i)_{app}/D_i$ varied in ranges of 0.54 to 0.68 depending on the liquid flow rates. The gas to liquid(water) volumetric mass transfer coefficient were determined from desorption experiments with oxygen at $25^{\circ}C$ and 1 atm. The measured mass transfer coefficients were increased with liquid flow rates and the effect of gas flow rates on the mass transfer coefficient was insignificant.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.372-373
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• 2011

최근 분산 전력 시스템은 효율적인 전력의 관리를 위하여 전 부하 영역에서의 높은 효율이 요구 되고 있다. 하지만 분산 전력 시스템은 Hold up time 규제로 인하여 정상 동작 시 낮은 시비율로 동작하게 되며 이에 따라 환류 구간이 발생하게 되어 도통 손실을 야기하며 이는 효율의 감소를 가져오게 된다. 따라서 작은 도통 손실을 갖는 새로운 위상 천이 풀브릿지 컨버터를 본 논문에서 제안하여 환류 구간의 손실을 감소시켜 효율 향상을 취할 수 있도록 한다. 본 논문에서는 제안된 컨버터를 소개하고 동작 원리 및 실험을 통한 검증 결과를 제시한다.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.388-389
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• 2011

본 논문에서는 서버용 전원 장치의 DC-DC단에 사용되는 디지털 전압 모드 제어기를 설계한다. 서버용 전원 장치는 2차 측에 고전류가 흐르는 사양으로 인하여 부하 전류에 따라 출력 인덕턴스 변화를 가지게 되며, hold-up time 규제를 만족하기 위하여 입력 전압의 변동 범위를 가진다. 이와 같은 조건은 제어기를 설계하는데 제약을 작용하게 되어 고정 이득을 가지는 방식에서는 최적화된 부하 변동 특성을 얻기 힘들다. 이와 같은 문제점을 해결하기 위하여 제어기의 이득 조정 기법을 제안하고 실험을 통하여 검증한다.

• Journal of the Korean Chemical Society
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• v.25 no.2
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• pp.103-109
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• 1981

An inexpensive, yet convenient analog storage device was constructed. Sequentially MOSFET-switched 20 sample and holds equipped with a high input impedance preamplifier were parallelly matched to the digitally controlled shift register system in variable speeds up to 3 kHz. To verify its usefulness, square wave train, sinusiodal wave and some electrochemical data, such as fast-scan voltammogram and transient current-time curves of differential pulse polarography were tested.

• Journal of Korean Vacuum Science & Technology
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• v.2 no.1
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• pp.25-31
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• 1998

The reliability of fluorine doped silicon oxide (SiOF) films for intermetal dielectrics in multilevel interconnections of ultra-large scale integrated circuits (ULSIs) is investigated. SiOF films were deposited by electron cyclotron resonance plasma-enhanced chemical vapor deposition (ECRPECVD) using H-free source gases, i.e., SiF4 and O2. The effect of post plasma treatment on the moisture absorption and dielectric properties of SiOF films was carried out I terms of air exposure time, The reliability test of Cu/TiN/SiOF/Fi specimen was carried out in terms of temperature by rapid thermal annealing (RTA) in N2 ambient. After O2 plasma treatment,, no appreciable peak directly related to moisture absorption was detected. The capacitance-voltage (C-V) characteristics of the O2 plasma treated SiOF film showed that the film remained to hold the sound dielectric properties even after boiling treatment. The Cu/TiN/SiOF/Si system was found to be reliable up to $600^{\circ}C$.

• Journal of Intelligence and Information Systems
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• v.1 no.2
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• pp.103-121
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• 1995

This study proposes a artificial neural network method to predict the time to buy and sell the stocks listed on the Korea Composite Stock Price Index(KOSPI). Four types (NN1, NN2, NN3, NN4) of independent networks were developed to predict KOSPIs up/down direction after four weeks. These networks have a difference only in the length of learning period. NN5 - arithmetic average of four networks outputs - shows an higher accuracy than other network types and Multiple Linear Regression (MLR), and buying and selling simulation using systems outputs produces higher reture than buy-and-hold strategy.

• Journal of Power System Engineering
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• v.6 no.4
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• pp.81-87
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• 2002

The modelling and controller design of the EMV(electro-magnetic valve) for vehicle engine are considered in this paper. For the analysis and controller design, the governing equation of the EMV system is derived. For a good performance of the system, the start control, the holding control and the swing control are included in the controller design of the EMV system. In order to reduce landing speed of the valve, the on-time delay control which mainly come from the optimal control theory is employed. In order to reduce the power consumption of the system, the pick-up and hold operation has been used for the magnetic coil. The simulation and experimental results are presented to show the validity of the control method.

• The Transactions of the Korean Institute of Power Electronics
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• v.24 no.1
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• pp.66-69
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• 2019

This study proposes a high-efficiency phase-shifted full-bridge (PSFB) converter with a wide input voltage range. The conventional PSFB converter is a useful topology in high-power applications. This converter not only achieves the zero-voltage switching of the primary switches, but also has small RMS current in the primary side. However, because the conventional PSFB converter has large freewheeling current in the primary side when it is designed considering the hold-up time of the converter, such a converter has high conduction loss at the primary switches. To solve this problem, a new PSFB converter is proposed in this study. The experiment is implemented with an input voltage ranging from a 320 V-400 V and an output power specification of 715 W.