• Proceedings of the Korea Society of Design Studies Conference
• /
• 2002.05b
• /
• pp.118-119
• /
• 2002

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.4 no.2
• /
• pp.25-30
• /
• 1995

The shifting and steering performance of the tracked vehicle with the hydromechanical continuous variable transmission is analyzed. The simulation results are closely similar to both the vehicle test result, As a result of hydromechanical transmission simulation, power circulation in 2nd and 3rd range is maximum 142% And power flow of mechanical part has the relationship with the effeciency of the vehicle and transmission.

• Journal of Pharmacopuncture
• /
• v.1 no.1
• /
• pp.77-86
• /
• 1997

In order to study the reproducibility and effeciency of the manu-pacture system Hwanggum(黃芩) aqua-acupuncuture was prepared. The filtra-tion and dilution have been mainly employed in the study of the manupacture step. These methods were showed possibility of standardization and variety for aqua-acupuncture.

• Journal of the Korean Institute of Telematics and Electronics D
• /
• v.35D no.1
• /
• pp.72-78
• /
• 1998

Polarization mode converters have been produced by utilizing Ti:LiNbO$_{3}$ channel waveguide and strain-optic effect. Shear strain for periodic perturbations of optical channel waveguides and phase matching can be obtained by an evaporated periodic SiO$_{2}$ thin film at 300.deg. C. The electrodes located on the either side of waveguide provide a means to electro-optically tune the wavelength for maximum polarization conversion via the electrooptic effect. The maximum conversion effeciency was observed at 21.deg. C for V=0 and 46.deg. C for V=30V aro the device having 7 .mu.m waveguide wiith and 350 periodic pads. The dependence of the number of pads on conversion efficiency was observed experimentally.fficiency was observed experimentally.

• Journal of Environmental Science International
• /
• v.7 no.1
• /
• pp.41-45
• /
• 1998

The feasibility of foam separation to remove protein in aquacultural recirculating water was investigated. From the results of batch foam separation on protein removal, superficial air velocity and initial protein concentration in bulk solution were found to be important operational factors In determining removal rates of protein. The protein removal rate by batch foam separation was proportionally increased with the superficial air velocity. Performance characteristics of continous foam separator were highly dependent upon the operating parameters of superficial air velocity, hydraulic retention time(HRT) and foam height. Removal effeciency of protein increases with increasing superficial air velocity and HRT, and independent on foam height. As DO concentration was increased with superficial air velocity, foam separator is also used for oxygen addition. It could be confinned that foam separator might offer better perspective for protein removal in aquacuitural recirculating water.

• 한국신재생에너지학회:학술대회논문집
• /
• 2011.05a
• /
• pp.117.1-117.1
• /
• 2011

We have demonstrated Forst-type resonance energy transfer (FRET) in the quasi-solid type dye-sensitized solar cells between organic fluorescence materials as an energy donor doped in polymeric gel electrolyte and ruthenium complex as an energy acceptor on surface of $TiO_2$. The strong spectral overlap of emission/absorption of energy donor and acceptor is required to get high FRET efficiency. The judicious choice of energy donor allows the enhancement of light harvesting characters of energy acceptor in quasi-solid dye sensitized solar cells which increase the power conversion efficiency. The enhanced light harvesting effect by the judicious choice/design of the fluorescence materials and sensitizing dyes permits the enhancement of photovoltaic performance of DSSC.

• Korean Journal of Soil Science and Fertilizer
• /
• v.5 no.2
• /
• pp.43-52
• /
• 1972

본실험은 유수형성기에 2일간 배수할 때 질소질 비료의 비종(유안과 요소) 및 시용시기(이앙기와 유수형성기)가 수도의 질소이용율에 미치는 영향을 보기 위해서 기후와 토양이 상이한 부산(동아대학교 농과대학 포장)과 서울(방사선 농학연구소 농장, 금곡)에서 농광 및 봉광 두품종을 사용해서 1970년에 실시 되었다. 유수 형성기에 2일간 배수하고 질소질 비료를 시용한 처리는 상시 담수구에 비해서 A-Value에 있어서 유의차가 없었으나 비료의 시용시기나 비종간에는 뚜렸한 차이가 있었다. 유수형성기에 추비하는것이 이앙기에 기비로서 시용하는 것 보다 자실에서 본 비료의 이용율이 4~5배 높았다. 자실의 질소함량은 봉광의 것이 실험지역에 관계없이 농광의 것보다 높았으며, 비료 이용율도 높은 경향을 나타내었다. 부산토양에서의 질소의 A-Value가 품종이나 비종에 관계없이 서울의것 보다 항상 높았던 것은 부산 토양의 질소함량이 높은데 기인하는 것으로 생각된다.

• Proceedings of the IEEK Conference
• /
• 1998.06a
• /
• pp.673-676
• /
• 1998

Future land remote sensing satellite systems will kikely be constrained in terms of communication band-width. To alleviate this limitation, the data must be compressed. Image data obtained from satellite exhibit a high degree of spatial and spectral correlations that must be properly exploited. In this paper we propose multispectral image data compression using wavelet transform and selective predicted vector quantization. Th eproposed method is based on accuratly predicting other band from reference band and reducing bit rate through threshold map. we can achieve better compression effeciency than conventional methods.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
• /
• 1999.02a
• /
• pp.169-172
• /
• 1999

The exergy method is used for analysis and evaluation of the cryogenic nitrogen production process which is operated by expansion turbene and liquid nitrogen. The exergy loss and thermodynamic effeciency are calculated for the each process. Also the operating efficiency and the exergy distribution are examined for each unit of proces. The optimal conditions to minimize the exergy loss of nitrogen column are found that nitrogen recovery ratio is maximum and operating pressure is 5.0 kg/cm2g. The exergy method can be used to design a plant and to evaluate its process.

• 제어로봇시스템학회:학술대회논문집
• /
• 1991.10a
• /
• pp.468-468
• /
• 1991

The variable-frequency type water supply equipment, which adopts the variable-voltage and variable-frequency converter(VVVF converter) to govern automatically the rotating speed of a pump, can save 15-20% of power, as compared with a throttle-controlled pump device or an airpressurized water supply equipment, and is finding a wide application. However, it still has some disadvantages : greater pressure fluctuations during switching over the pump and prolonged low-effeciency running of the pump in the case of small consumption of water. Therefore, it is difficult to apply the equipment to the fire water supply system where the water should not be put into use unless a fire takes place, and the water pressure in pipelines should permanently remain constant. This paper introduces the automatic regulation principle of the variable-frequency type air-pressurized water supply equipment (hereafter referred to as simply BFQS equipment) for dual purposes of daily life and fire control, which combined both technologies of speed governing by a converter and air-pressurized water supplying, then discusses some problems related to automatic control, and finally gives the experimental results of an embodiment-BPQS-100-50 water supply equipment.