• Fisheries and Aquatic Sciences
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• 제20권7호
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• pp.13.1-13.7
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• 2017

In order to evaluate the maximal storable period of the raw crab for a non-thermal muscle separation, the quality changes of the leg meat of red snow crab (Chionoecetes japonicus) during freeze storage were investigated. Fresh red snow crabs were stored at $-20^{\circ}C$ for 7 weeks, and the leg muscle was separated by a no heating separation (NHS) method every week. During the storage, considerable loss of the leg muscle did not occur and microbiological risk was very low. In contrast, discoloration appeared at 2-week storage on around carapace and the leg muscle turned yellow at storage 3-week. In physiochemical parameters, protein and free amino acids gradually decreased with storage time, expected that proteolytic enzymes still activated at $-20^{\circ}C$. At 4-week storage, the sensory acceptance dropped down below point 4 as low as inedible and notable inflection points in pH and acidity were observed. The volatile base nitrogen was low, though a little increase was recorded. These results suggested that the maximal storable period at $-20^{\circ}C$ of the raw material was within 2 weeks and it was depended on external factor such as the discoloration. The present study might be referred as basic data for approaches to solve quality loss occurred in non-thermal muscle separation.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.2009_2010
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• 2009

Thin-gauged 3% Si-Fe sheets having a high magnetic induction of over 1.9 T have been developed for the purpose of applications where operation frequency is higher than power frequency. In order to clarify requirements of iron loss characteristics for the applications, iron loss characteristics of the newly developed strip were investigated by iron loss separation method and were compared with those of commercially produced 0.3 mm-thick electrical sheets. In case of relatively high excitation induction(1.7 T) and low frequency(60 Hz), reducing hysteresis loss is effective to decrease total iron loss. In case of relatively low excitation induction(1.0 T) and high frequency(1 kHz), reducing eddy-current loss is effective by decreasing thickness and grain size to improve total iron loss.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제49권5호
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• pp.352-357
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• 2000

This paper presents about an example of circuit design and characteristics of inverter according to the variable capacitance of the DC voltage source separation capacitor used in ZVS-HB type high frequency resonant inverter. The soft switching technology known as ZVS is used to reduce turn off loss at switching. In the event the capacitance of the DC voltage source separation capacitor is varied, the analysis of inverter circuit has generally described by using normalized parameter and operating characteristics have been evaluated in terms of switching frequency and parameters. According to the calculated characteristics value, a method of the circuit designs and operating characteristic of the inverter is also presented in this paper. In addition, this paper proves the validity of theoretical analysis through the experiment. This proposed inverter shows that it can be practically used in future as power source system for the lighting equipment of discharge lamp, DC-DC converter etc.

• 산업기술연구
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• 제22권B호
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• pp.21-26
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• 2002

The non-dimensional heat loss from a thermally asymmetric triangular fin is investigated as a function of a ratio of upper and lower surface Biot numbers (Bi2/Bi1), the non-dimensional fin length and tip surface Biot number using the two-dimensional separation of variables method. The effect of fin tip surface Biot number on the variation of the non-dimensional temperature along the sloped upper and lower surfaces for the thermally asymmetric condition is presented. The relationship between the non-dimensional fin length and the fin tip surface Biot number for equal amount of heat loss is also discussed as well as the relationship between upper surface Biot number and tip surface Biot number for equal amount of heat loss.

• Journal of the Korean Society for Industrial and Applied Mathematics
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• 제6권2호
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• pp.109-120
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• 2002

The dimensionless heat loss from a modified asymmetric rectangular fin is investigated as a function of the fin top and tip Biot numbers using the two-dimensional separation of variables method. A rectangular fin is modified by attaching the wing on the top side of the fin. Fin effectiveness and efficiency with the variation of the location of the wing and the width of the wing are presented. The relationship between top surface Biot number and bottom surface Biot number as well as the relationship between the dimensionless wing height and the location of the wing for equal amount of heat loss is also discussed.

• International Journal of Air-Conditioning and Refrigeration
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• 제13권3호
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• pp.145-151
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• 2005

A thermally asymmetric straight rectangular fin is analysed and optimized using the two-dimensional separation of variables method. The optimum heat loss is presented as a function of bottom to top Biot number ratio, fin base length and top Biot number. Decreasing rate of the optimum fin length with the increase of the fin base length is listed. The optimum fin tip length is shown as a function of bottom to top Biot number ratio, fin base length and tip to top Biot number ratio. One of the results shows that the optimum heat loss and the actual optimum fin length decrease while the optimum fin tip length increases as the fin base length increases.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.1649-1654
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• 2009

Induction motors widely use in industry because structure is simple and hard and cost is generally cheap and they are easy to control. In recently, because of saving steel, ventilation and benefit of frame fixing, rectangular core type induction motors use in industry more and more. This paper presents current characteristic according to stator core cutting degree in three-phase induction motor (IM) with rectangular stator core. According to stator cutting degree, magnetic saturation and paths of flux are changed. Because of these situations, phase currents are unbalance and are produced harmonic components and they cause decrease of efficiency. We analyze each $10^{\circ}$ from $0^{\circ}$ to $30^{\circ}$ using 2-D finite element analysis (FEA). Optimal stator cutting core degree selection supplies stable currents and efficiency improvement. In this paper, loss separation test was executed by IEEE Std. 112-98 Method B and we compare with the result of loss separation by Simulation using FEM and by Experiment.

• 멤브레인
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• 제21권2호
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• pp.177-192
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• 2011

바이오 가스의 분리와 정제를 위해 셀룰로오스 트리아세테이트(CTA) 고분자를 이용하여 중공사형 기체분리막을 상분리법에 의해 제조하고, 제조된 기체분리막을 사용하여 유효 막면적이 0.17 $m^2$인 중공사형 기체분리막 모듈을 제조하였다. 제조된 기체분리막 모듈의 순수 기체투과도틀 메탄, 산소, 이산화탄소에 대하여 측정하였다. 메탄의 투과도는 평균 0.46 GPU를 나타내었으며, 이산화탄소의 투과도는 평균 18.52 GPU였으며 이때 ${\alpha}CO_2$/$CH_4=40.4$를 나타내어 매우 높은 선택도를 나타내었다. 순수 가스 투과 테스트 후 혼합 가스에 대한 분리 정제 테스트를 4가지 모사가스에 대하여 진행하였으며 1 stage, 2 stage, 3 stage로 기체분리막 모듈을 구성하여 stage cut의 변화에 따른 각 부분에서 발생되는 기체의 농도 및 유량을 측정하였다. 1 stage에서는 stage cut이 상승함에 따라 메탄의 농도가 상승하는 것을 알 수 있었으며, 메탄 회수 효율은 떨어지는 것을 알 수 있었다. 2 stage 테스트에서는 1 stage와 유사한 거동을 보이는 것을 알 수 있었으며 메탄의 회수 효율은 1 stage보다 상승하는 것을 알 수 있었다. 바이오 가스 내에 존재하는 메탄의 손실을 줄이기 위해 3 stage 테스트를 진행하였으며, 그 결과 메탄가스의 손실율을 5% 이내로 줄일 수 있는 모듈의 배열을 찾아내었다.

• 보건행정학회지
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• 제11권4호
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• pp.70-87
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• 2001

The purpose of this study was to identify health care providers' perceptions about the goal achievement and benefit/loss caused by the separation policy of drug prescribing and dispensing after the policy implemented on July 1, 2001. Uslng stratified sampling method based on the administration area, Ku, 315 physicians and pharmacists were sampled from the rosters of physician and pharmacist association in the city of Busan on 2001. There were 122 and 115 responses from physician and pharmacist sample, respectively. 78.3% of physicians and 50.4% of pharmacists evaluated that the goal of the policy was not achieved. Moreover, 75.3% of physicians and 40.7% of pharmacists did not support the policy. Most physicians and pharmacists considered preventing the citizens with drug abuse and misuses as the most important benefit derived from the policy. However, physicians and pharmacists concerned over raising health care cost that could be patients' burden. The most important physicians' benefit derived from the policy was free choice of all possible medicine that might result in effectiveness of medication. In physicians' the most important loss, most physicians worried about that breaking traditional patient and physician relationship might cause physicians' authority in treating diseases to be damaged. Pharmacists considered the most important policy benefit as hiked social status resulted from enforcement of profession due to the policy whereas they considered the most significant loss as expected financial problems of small pharmacies compared to that of large pharmacies or pharmacies adjacent to hospitals. In the current problems of the policy, physician and pharmacists blamed the government for inadequate preparations of the policy implementation. Physicians and pharmacists also considered citizens' mature attitudes toward the policy as a crucial success factor.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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• pp.675-678
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• 2017

In the present, various methods have been employed to obtain the lesser thrust loss. Numerical simulations have been carried out for optimizing the thrust vector control system. Thrust vector control based on coflowing shear layer is an effective method to control the primary jet direction in the absence of moving parts. Thrust vector in symmetric nozzles is acquired by secondary flow injections that result to boundary layer separation. The pressure in secondary flow inlet was varied to check the deflection angle of jet flow.