• Rapid Communication in Photoscience
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• 제3권3호
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• pp.56-58
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• 2014

Single-walled carbon nanotubes (SWNTs) catalyzed hydrogen production from water containing various electron donors under visible light (${\lambda}$ > 420 nm). As-received SWNTs were effective for hydrogen production, yet the effect vanished when they underwent surface chemical treatments. Upon coupling with CdSe particles, however, the surface treated SWNTs were far superior to non-treated SWNTs by a factor of ~30 for hydrogen production.

• 대한전기학회논문지
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• 제36권5호
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• pp.328-338
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• 1987

A New CSI which is belived to be much advantageous than ASCI is proposed. The new CSI operates in a much wider frequency range with much lower voltage stresses on the motor terminals and power devices compared with ASCI. Simulation results show that the new CSI is about factor of four times superior to ASCI in operating frequency range or in voltage stress. The exterimental results are shown for a 5HP induction motor.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1994년도 가을 학술발표회 논문집
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• pp.255-260
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• 1994

This study suggests a strengthening effect evaluation technique of reinforced concrete beams using the vibration test. To evaluate the strengthening effect of R/C beams, Strengthening Factor(Sf) was suggested. Using the value of Sf, 20 beams were evaluated. According to these results the effects of R/C beams strengthened by steel plate is superior than those of R/C beams strengthened by carbon fiber sheet.

• Journal of Dairy Science and Biotechnology
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• 제14권2호
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• pp.185-193
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• 1996

This study was to investigate principle of freeze concentration such as nucleation, crystal growth and procedure of freeze concentration, essential factor and application of freeze concentration. Especially, quality of milk was emphasized. For exemple, in sensory evaluation of freeze concentrated and reconstituted skim milk and whole milk, taste, color, mouth feel and texture were superior to control. Recently developed technique of freeze concentration for quality milk and dairy products may be expected for advanced quality of various milk and dairy products in near future.

• Journal of the Korean Data and Information Science Society
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• 제26권6호
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• pp.1397-1407
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• 2015

개체의 표현형은 대부분 유전적인 요인의 영향과 환경적인 요인의 영향을 모두 받는다. 따라서 한우의 경제적인 특성과 연관이 있는 유전자 마커 선별 연구에서도 관심이 있는 유전적인 요인의 효과를 좀 더 정확히 보기 위해서는 환경적인 요인의 보정이 필요하다. 본 연구의 목적은 고품질 한우 생산을 위한 우수 유전자 마커 선별 연구에서 환경적인 요인이 보정된 새로운 통계 모형을 제안하고 그 효과를 규명하는 데 있다. 먼저 환경적인 요인과 유전적인 요인을 모두 포함한 통계모형을 구축한 뒤, 환경적인 요인인 도축일령과 사육농가의 효과를 제거하여 보정된 경제형질의 값을 구한다. 그리고 다중인자차원축소 방법을 보정 전 후 데이터에 각각 적용하여 우수 유전자 마커 조합을 선별하고 정확도를 비교한다. 사용된 경제형질은 C18:1, SFA, MUFA, MS, CWT, BFT이며 사용된 유전자 마커는 49개 LPL 유전자 마커 중 지방산 조성 및 경제 형질 능력 검정을 통해 나머지에 비해 더 뛰어난 유전자 마커로 선별된 6개 (g.6960 A>T, g.6974 G>A, g.21604 G>A, g.22488 G>T, g.22649 G>A, g.25670 C>T)이다.

• 콘크리트학회논문집
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• 제12권2호
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• pp.43-51
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• 2000

This study is to investigate for the frost resistance of high-flowing concrete using finely ground granulated blast-furnace slag with experimental parameters, such as type of binder, type of superplasticizer and method of curing. The resistance to freezing and thawing of high-flowing concrete by type of binder and superplasticizer is presented differently. Though the frost resistance of high-flowing concrete is satisfactory under standard condition, it is required that high-flowing concrete has entrained air like plain concrete. Because the critical spacing factor, being capacity of frost resistance, of high-flowing concrete is longer that of plain concrete, the frost resistance of high-flowing concrete, using finely ground granulated furnace blast slag, is superior to that of plain concrete.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.215-218
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• 2005

We have investigated on the development of 2-2 piezocomposites that have better piezoelectric activity and lower acoustic impedance than those of conventional piezoceramics. In this study, we have investigated the piezoelectric and acoustic properties of 2-2 piezocomposites sensor which were fabricated using dice-and-fill technique for the different volume fraction of PZT. The resonance characteristics measured by an impedance analyzer were similar to the analysis of finite element method. The resonance characteristics and the electromechanical coupling factor were the best when the volume fraction PZT was 0.6. It also showed the highest result from the standpoint of sensitivity, bandwidth and ring-down property and so on at the same condition. The specific characteristics shows that the 2-2 piezocomposites turned out to be superior to the ultrasonic sensor composed by single phase PZT.

• 한국정밀공학회지
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• 제12권4호
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• pp.111-118
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• 1995

This paper presents the modified fuzzy-compensated PID(FCPID) control, which involves adding the compensator to an existing PID controller, to improve the performances of the systems. Compared to a conventional PID control and a fuzzy logic control(FLC), the proposed control scheme has superior performance. Experimental results of an actual implementation of the modified PC-based FCPID controller on the DC servo-motor demonstrate considerable improve- ment of the performance of the existing FCPID control by monitoring the scaling factor. They show faster responses and smaller overshoots than the conventional FCPID control scheme for the various reference inputs and the robustness to the loads.

• 열처리공학회지
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• 제16권6호
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• pp.315-319
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• 2003

Effect of nitriding on fatigue crack initiation and growth rate has been studied in Ni-Cr-Mo steel. Specimens were nitrided at $860^{\circ}C$ for 15 hr. The fatigue limit of nitrided specimens were superior to those ofannea1ed($860^{\circ}C$, 15 hr) specimens. Based on detailed observations of slip band and micro crack initiation, it is concluded that the excellent fatigue limit of nitrided specimens is attributed to improved slip initiation resistance by nitriding. The characteristic of fatigue crack growth rate of nitrided specimens was investigated by comparing with those of annealed specimens. It was found that the crack growth rate was markedly decreased and the threshold stress intensity factor range was improved by nitriding. It is concluded that the excellent fatigue limit of nitrided specimens is also attributed to improved fatigue crack growth rate and threshold stress intensity factor range by nitriding.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1052-1054
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• 2001

This paper describes a boost converter to be operated at the boundary of continuous current mode(CCM) and discontinuous current mode(DCM) for power factor correction and low cost. A control method to be utilized in simulation is a average-current mode method in case of operating in CCM. The simulation results show that Better is the CCM converter then the DCM converter in harmonic content and input current waveform. And A Double-boost converter is superior to single-boost converter for input-current harmonic.