25KJ 超電導磁石 設計에 관한 硏究 : 25KJ 초전도자석 설계에 관한 연구

권영안 釜山大學校 工科大學 1987 工科大學 硏究 報告 Vol.34 No.-

有限要素法을 利用한 超傳導 리액터의 인덕탄스計算에 관한 硏究 : 유한요소법을 이용한 초전도 리액터의 인덕탄스계산에 관한 연구

권영안 釜山大學校 工科大學 1989 工科大學 硏究 報告 Vol.38 No.-

超傳導 리액터의 體積最小化에 관한 硏究 : 초전도 리액터의 체적최소화에 관한 연구

권영안 釜山大學校 工科大學 1990 工科大學 硏究 報告 Vol.40 No.-

超電導에너지 貯藏裝置에 의한 電力制御에 관한 硏究 : 초전도에너지 저장장치에 의한 전력제어에 관한 연구

권영안 釜山大學校 工科大學 1988 工科大學 硏究 報告 Vol.35 No.-

Bioproducts의 건조를 위한 건조기와 건조방식의 고찰

권영안 한국산업식품공학회 2004 산업 식품공학 Vol.8 No.4

Clearly, it is important to provide an overview all of the emerging drying technologies that are relevant to drying of the diverse and ever increasing numbers of bioproducts. There are a lot of different methods to dry bioproducts, but the most important thing of the bioproducts drying is the selection of dryer and drying method which is not affected to the original components of the bioproducts after drying. Moreover, conventional thermal processes in drying frequently lead to undesirable flavor and loss of desirable fresh flavor, aroma, vitamins, and essential nutrients. These negative effects on food quality can be the motivation to search a new technology and we try to emerge this new technology to conventional drying technology. Therefore, I'd like to review the emerging drying technologies and it may help to choose the dryer and drying technology for the bioproducts.

스위치드 리럭턴스 전동기의 전압제어 및 전류제어

남정한,권영안 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-

최근에 가전 및 군수분야등 여러 분야에서 스위치드 리럭턴스 전동기의 응용에 대한 관심이 커지면서 간단하고 저가이면서 양호한 구동특성을 보이는 속도제어 방식에 관한 연구의 중요성이 증대되고 있다. 본 논문에서는 스위치드 리럭턴스 전동기의 속도제어 방식에서 제어 가능한 변수로서 점호각과 소호각, 소정의 전류슈준을 설정하여 이 세가지 제어변수를 고려한 전압제어 및 전류제어 알고리즘을 설계하였다. 특히 스위치드 리럭턴스 전동기 및 인버터 구동회로를 포함하는 전체시스템의 특성을 고려한 전압제어 및 전류제어 알고리즘을 강구하였으며 이와 함께 원칩 마이크로프로세서인 80C196KC를 이용한 전압제어 및 전류제어를 구현하였다. 80C196KC는 고속입출력기능, PWM 기능, A/D컨버터기능 등을 내장하는 16비트 원칩 마이크로프로세서로서 본 연구에서는 이러한 기능들을 적절히 활용하는 전압제어 및 전류제어 알고리즘을 구성하고 상호 비교를 수행하였다. 본 연구에서 설계된 전압제어 및 전류제어 시스템은 실험을 통하여 운전특성 및 성능을 검증하였으며 본 연구를 통하여 80C196KC가 가지는 기능들은 불연속여자특성을 가지는 스위치드 리럭턴스 전동기의 전압제어 및 전류제어 구성에 매우 부합됨을 확인하였다. 본 연구에서 구성된 속도제어 시스템은 간단하고 저가이면서 양호한 구동특성을 보이는 속도제어 시스템에 활용될 것으로 기대된다. The switched reluctance motor is comparable to the inverter driven induction motor. Recently a switched reluctance motor is highly considered for the applications to home appliances and defence industry. Simultaneously a low cost controller with high performances becomes more significant for a switched reluctance motor drive. This paper investigates voltage and current controls of switched reluctance motor which are considering turn-on angle, turn-off angle and current level as controlled variables. One-chip microprocessor 80C196KC, an embedded microcontroller, is well applied to voltage and current controls of switched reluctance motor because a switched reluctance motor is excited by the excitiation modes of pulse type. Voltage and current control algorithms are implemented by utilizing several functions of 80C196KC. The proposed drive system is verified through the experiments, and may be utilized as a drive system with a low-cost and high-performance controller.

超電導에너지 貯藏裝置에 의한 電力制御에 관한 硏究

權營顔 부산대학교 공과대학 1988 硏究報告 Vol.35 No.-

Superconducting Magnet Energy Storage(SMES) has many advantages as energy storage system: high efficiency, fast response, relative easiness to site near load center, nonpolluting, satisfactory economies for large units, and low cost in operation and maintenance. This paper is a study on power control of SMESS. Superconducting magnet of 25 KJ is used and electrical system is composed of power converter part, control part, measuring part, firing part, interfacing part and protection part. Double Graetz bridge is used as a power converter between 3-phase source line and superconducting magnet, and IBM-PC is used for digital control of active and reactive power in control part. Power controls are performed well as shown in experimental results. Harmonics due to power converter is reduced by series transformer connection of delta-delta and wye-delta.

超傳導 리액터의 體積最小化에 관한 硏究

權營顔 부산대학교 공과대학 1990 硏究報告 Vol.40 No.-

Superconducting reactors are feasible for several applications because they can overcome resistance loss and capacity limit. In the design of superconducting reactor the minimization of ists volume is very important because superconductor is saved, and heat loss is reduced. In this paper the curves related to inductances is effectively used for line search that finds the minimum volume. The nonlinear programming is also used for minimization of reactor volume. Finally the curve of opimum shape is presented by combining results of two methods.

Discrimination of Astaxanthin Fed Laying Hens and Their Peroxidated Carcasses by Electronic Nose

권영안,이찬용,이봉덕,안길환,최승현 한국가금학회 2010 韓國家禽學會誌 Vol.37 No.3

The applicability of electronic nose was tested to detect lipid peroxidation in chickens and to measure antioxidant effect of astaxanthin in chicken carcasses. Two sources of astaxanthin were fed to 62-wk-old spent laying hens to improve meat quality: natural astaxanthin (NA) from the red yeast, Phaffia rhodozyma, and synthetic astaxanthin (SA) from chemical synthesis. One hundred forty four ISA Brown laying hens were used in a 6-wk feeding trial. Three treatments consisted of the basal diet (control), SA (100 mg astaxanthin/kg basal diet) and NA (50 mg astaxanthin/kg basal diet). The astaxanthin levels of SA and NA were set to give a similar degree of skin pigmentation. After 6-wk feeding of astaxanthin, the skins from NA and SA were discriminated from the control by electronic nose. However, electronic nose failed to distinguish between SA and NA skins after 6-wk feeding. The astaxanthin level differences between skins of SA and NA were not emarkable during the 6-wk trial. The lipid peroxide formation in skin was significantly decreased by SA but not by NA. The antioxidation effect of SA was detected by electronic nose because SA skin was discriminated from others. NA was a better pigmentation agent than SA, but the reverse was true in antioxidation. Electronic nose is applicable for detecting astaxanthin in chicken, and meat off-flavor caused by lipid peroxidation during storage.

Manufacturing of Korean Barley Malt to be Improved the Enzyme Activity Using Ultrasound or Microwave

권영안,박기홍 (사)한국조리학회 2018 한국조리학회지 Vol.24 No.7

A variety of Korean barley were investigated to make malt. One of the major defects in the malt using Korean barley was small amount of enzyme activity. To improve the enzyme activity of Korean barley malt, new technologies such as ultrasound and microwave were used. The test varieties were three species such as Dahyang barley, 6-row barley, and Jinyang barley and Gwangmac barley, 2-row barley. The methods of malt production and quality test were established. Steeping time, protein and water contents, germinating power, loss, color, etc. were tested for the final selection. To apply the supplementary treatments to enhance the malting qualities, the selected variety, Dahyang, were rigorously tested with additional control, Gwangmac barley plus Jinyang. When ultrasound, an innovative technique, was employed, enzyme activity of the malt was primarily considered. As the treatment intensity and the treatment time of ultrasound increased, the enzyme activity increased. Gwangmac was pronounced in the effect of ultrasound. Microwave was also treated. The enzyme activity also increased with microwave treatment times. Therefore, when the new technology is treated in the emerging stage of manufacturing malt, the enzyme activity was largely increased.