• Journal of Biosystems Engineering
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• v.14 no.2
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• pp.115-122
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• 1989

The objective of this study was to develop a portable auger for handling rough rice in bulk. For this purpose, a system analysis was taken for the systems of harvesting, drying, storage and transportation of rough rice and an optimal handling capacity of portable auger was determined. Then a portable auger of which capacity is 9.2 $m^3/h$ (Indica type rough rice, 19.5%, w.b.) was designed and manufactured by design requirements and tested. Test results showed that the performance of portable auger developed satisfied most design requirements.

• Journal of Biosystems Engineering
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• v.19 no.1
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• pp.42-49
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• 1994

Texturization of plant protein means the physical or chemical recomposition method of plant protein damaged during the extracting process of soybean oil. As a stable protein supplement, substituted for meat, needs of texturized products have been increased. Twin screw extruder is a very effective tool for texturization process as a physical method. This research, using defatted soy flour as raw material and twin screw extruder manufactured in domestic, showed that plant protein was texturized successfully on the operating conditions of barrel temperature of $120{\sim}140^{\circ}C$, material feed rate of 30~36kg/hr and water content of 20~25%. It also showed that the shape of die affected the texturization continuity.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.07a
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• pp.475-478
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• 2011

율-왜곡 최적화 기법을 통한 화면내 예측 모드 결정 방법은 부호화 효율이 높지만 복잡도가 크다. 본 논문에서는 H.264/AVC의 율-왜곡 값의 특성을 분석하여 율-왜곡 최적화 기법에 사용되는 예측 모드의 후보를 줄임으로써 보다 빠른 휘도 화면내 $4{\times}4$ 예측 모드 결정 방법을 제안한다. 제안된 방법은 균일한 차분 블록값을 가지는 예측 모드와 균일하지 않은 차분 블록값을 가지는 예측 모드의 통계적 분석을 통해 부호화 속도를 향상시킨다. H.264/AVC의 참조 소프트웨어 JM 14.2와 비교하여 0.04[dB]라는 무시할 수 있는 PSNR의 손실을 가지면서도 0.3[%]의 비트율 절약과 19.6[%]의 부호화 속도 향상을 가져왔다.

• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.815-818
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• 2004

The emerging applications such as reliable back-up power system and renewable energy call for high boost U-n converter. The conventional topologies to get high output voltage are using flyback circuit, cascade converters, and coupled inductor DC-DC converter. They have the stress and loss related to the leakage energy which results in low efficiency Tn this paper, novel high boost converter is presented. It has a structure of cascade boost converter but only one switch. Therefore, drive circuit is simple and extreme duty ratio is eliminated. To verify the proposed circuit, theoretical analysis and experimental results has been done using a prototype power supply.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.141-143
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• 2004

Distributed generation(DG) using microturbine will be adopted widely because of its various usages and merits such as high heat efficiency, environmental-friendliness. Commercialized DG using microtubine that rotates up to $60,000\~100,000[rpm]$ converters mechanical power to electricity by permanent magnet synchronous machine. This paper presents comparative test and simulation results of PMSM as generator. Test was done by diode rectifier and inverter. Parameters used in the simulation are driven from FEM analysis. Under various speed and load conditions, V-I characteristics matches well and it suggests the possibility of high speed PMSM as generator. DG operating at stand alone and grid connection mode will be developed.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.144-146
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• 2004

This paper presents experimental operation with utility invertactive 3kW photovoltaic generation system. And that describe configuration of utility interactive photovoltaic system which power supply for Demonstration experiment. The status of photovoltaic generation system comp-onents and interconnection and safety equipment will be summarized. This paper discusses property operation state which system endure division of power for demonstration experiment.

• 대한생식의학회:학술대회논문집
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• 2004.11a
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• pp.88.2-89
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• 2004

• Bulletin of the Korean Chemical Society
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• v.28 no.12
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• pp.2338-2343
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• 2007

Under the framework of green chemistry, an efficient and extremely fast procedure for the synthesis of 5a-h through four-step procedure starting from 2-arylidenetetralin-1-one 1a-d under microwave irradiation is described. A considerable increase in the reaction rate has been observed with better yield. The structures of the synthesized compounds have been characterized on the basis of their elemental analysis and spectral data. Synthesized compounds 5a-h was evaluated for their antimicrobial activity. Some of the compounds exhibited appreciable activity.

• Proceedings of the KIEE Conference
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• summer
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• pp.470-472
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• 2004

This paper proposes a method of increasing the Permissible current carrying capability of underground power cables. A clue of this method is driven from the temperature distribution analysis processes according to the currents calculated from unequally mode algorithm in ampacity program.

• Bulletin of the Korean Chemical Society
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• v.31 no.9
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• pp.2633-2636
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• 2010

3-Acetyl-5-benzoyl-6-methyl-2-phenyl-4H-pyran-4-one has been subjected to condensation with a series of primary amines (ethylamine - octylamine) to clarify the proposed mechanism in our previous study. The reactions of the shorter amines of the series (ethylamine - butylamine) yielded unsymmetric pyridinone products, whereas the other amines (pentylamine - octylamine) yielded symmetrical pyridinones. The starting material and the products as well as the intermediates have been subjected to theoretical analysis by quantum chemical calculations at B3LYP/6-31G(d,p) level, which provided supporting data for the experimental findings.