• Food Science and Preservation
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• v.6 no.2
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• pp.194-199
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• 1999

Sesame samples used in this study were Korean variety cultivated in Chochiwon City of Korea (KvKc), Chinese variety cultivated in Jilin Province of China(CvCc), Chinese variety cultivated in Chochiwon city of Korea(CvKc) and Korean variety cultivated in Jilin Province of China(KvCc). The extraction yields of sesame oils from KvKc, CvCc, CvKc and KvCc were 47.8%, 48.1%, 48.6% and 49.3% respectively. The color value (L value) of sesame oil from KvKc was lower than that of CvCc and KvKc sesame oil showed dark brown color. The composition of neutral lipid, glycolipid and phospholipid of free lipids from KvKc and U sesame oils were 93.1%, 6.6%, 0.2% and 94.7%, 4.6%, 0.8% respectively. Major fatty acids of KvKc and CvCc sesame were usaturated fatty acids, such as oleic and linoleic acid. Total composition of the two major fatty acids of KvKc was 84.6% which was almost same with that of CvCc. However the composition of oleic and linoleic acid of KvKc were 47.1% and 37.5%, while the composition of CvCc were 40.5% and 44.3%. When cross-cultivated, the composition of oleic and linoleic acid of CvKc were 41.0% and 43.5%, while the composition of KvCc were 42.0% and 43.7%. The contents of total amino acids and essential amino acids of KvKc were 713 mg% and 309 mg%, which were much higher than those of CvCc. When cross-cultivated, the content of total amino acids of KvCc was 44% lower than that of KvKc while the content of total amino acids of CvKc was 36% higher than that of CvCc.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.349-350
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• 2014

본 논문은 CC-CV충전의 충전특성과 열특성을 분석하고 이를 바탕으로 CC-CV충전에서 고속저온충전을 위한 최적충전전류를 제안한다.

• Proceedings of the KIPE Conference
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• 2016.07a
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• pp.337-338
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• 2016

This paper introduces a novel dual Full-Bridge LLC(FBLLC)resonant converter for CC/CV Charge of the Battery for Electric Vehicles. One full-bridge LLC resonant converter operates with a fixed-resonant network and the other operates with a variable-resonant network for CC and CV mode operations. The proposed converter can achieve ZVS for all the primary switches and exhibits a highefficiency characteristics like aconventional single FBLLC resonant converter. In addition, the variable-resonant network helps minimize the switching-frequency variation. The dual structure makes the proposed converter possible to achieve ZVS and nearly ZCS for all the primary switches in CC mode operation. Since the proposed converter can operate at a fixed frequency in CV mode, it can minimize the circulating current and achieve nearly ZCS. A 6.6 kW prototype converter is implemented to verify the validity of proposed converter and the maximum efficiency of 98.3% was achieved.

• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.25-26
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• 2015

Inductive Power Transfer (IPT) method becomes more and more popular for the Electric Vehicle (EV) battery charger due to its convenience and safety in comparison with plugged-in charger. In recent years, Lithium batteries are increasingly used in EVs and Constant Current/Constant Voltage (CC/CV) charge needs to be adopted for the high efficiency charge. However, it is not easy to design the IPT Battery Charger which can charge the battery with CC/CV charge under the wide range of load variation due to the wide range of variation in its operating frequency. This paper propose a new design and control method which makes it possible to implement the CC/CV mode charge with minimum frequency variation (less than 1kHz) during all over the charge process. A 6.6kW prototype charge has been implemented and 96.1% efficiency was achieved with 20cm air gap between the coils.

• Aerospace Engineering and Technology
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• v.8 no.2
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• pp.140-148
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• 2009

MOV(Main Oxidizer shut-off Valves) control the combustion of launch vehicle systems by the supply and the isolation of liquid oxygen to a main combustion chamber in launch vehicle systems. Moreover, in the steady operational state, the MOV should secure a constant flow rate of liquid oxygen for combustion instability in the combustion chamber. Concerning the development of MOV, TM(Technology Model) has been manufactured and normal operations of the valve have been verified. However, the Cv of TM has been proved to be too low as compared with a design specification value. Therefore, CFD analysis have been performed by modification of the configurations of TM in order to increase sufficiently Cv of EM(Engineering Model), which is the following model of TM. The modifications of TM configurations such as partial scale-up of valve, increase of stroke length, and outlet angle of 120o would result in a considerable augmentation of Cv. It has been verified by flow capacity tests that the improved Cv of EM is min. 212, which is higher than Cv of TM, 161 by about 32%.

• Korean Chemical Engineering Research
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• v.53 no.3
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• pp.269-275
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• 2015

The adsorption characteristics of ions were evaluated for the nitrate-selective carbon electrode (NSCE) in accordance with power supply methods. The NSCE was fabricated by coating the surface of a carbon electrode with anion-exchange resin powders with high selectivity for the nitrate ion. Capacitive deionization (CDI) experiments were performed on a mixed solution of nitrate and chloride ion in constant voltage (CV) and constant current (CC) modes. The number of total adsorbed ions in CV mode was 15% greater than that in CC mode. The mole fraction of adsorbed nitrate ion showed the maximum 58%, though the mole fraction was 26% in the mixed solution. This indicates that the fabricated NSCE is highly effective for the selective adsorption of nitrate ions. The mole fraction of adsorbed nitrate was nearly constant value of 55-58% during the adsorption period in CC mode. In the case of CV mode, however, the values increased from the initial 30% to 58% at the end of adsorption. We confirmed that the current supplied to cell is important factor to determine the selective removal of nitrate.

• Journal of the Korean Society of Industry Convergence
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• v.23 no.2_1
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• pp.115-124
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• 2020

In wireless power transfer (WPT) system, the conventional compensation topologies only can provide a constant current (CC) or constant voltage (CV) output under their resonant conditions. It is difficult to meet the CC and CV hybrid charging requirements without any other schemes. In this study, a switching hybrid topology (SHT) is proposed for CC and CV electric vehicle (EV) battery charging. By utilizing an additional capacitor and two AC switches (ACSs), a double-side LCC (DS-LCC) and an inductor and double capacitors-series (LCC-S) topologies are combined. According to the specified CC and CV charging profile, the CC and CV charging modes can be flexibly converted by the two additional ACSs. In addition, zero phase angle (ZPA) also can be achieved in both charging modes. In this method, because the operating frequency is fixed, without using PWM control, and only a small number of devices are added, it has the benefits of low-cost, easy-controllability and high efficiency. A 3.3-kW experimental prototype is configured to verify the proposed switching hybrid charger. The maximum DC efficiencies (at 3.3-kW) of the proposed SHT is 92.58%.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.139-140
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• 2012

현재의 배터리 충전기는 보편적으로 CC-CV 충전방법을 사용하면서 배터리의 과충전에 대해 안정적인 제어를 한다. 하지만 충전말기의 CV 모드는 배터리 충전이 느려 시간이 많이 낭비된다. 본 논문은 CC 단일형 충전을 하면서 과충전의 우려는 DFT를 사용하여 배터리 내부전압을 추정하면서 내부 알고리즘에 의해 배터리 내부전압이 설정값이 되었을 경우 충전을 종료하면서 CV 충전으로 낭비되는 시간을 줄인다. 이를 시뮬레이션을 통하여 그 타당성을 확인한다.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.407-408
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• 2017

In regenerative mode of an IPMSM control system without a bi-directional DC-DC converter, the 3-phase PWM inverter charges the battery. At this time, the regenerative torque reference for braking must output the proper torque reference to charge the battery. This paper proposed a regeneration control method that controls the voltage and current of the battery through CC-CV control at the regenerative braking torque corresponding to the driver's brake control.

• Proceedings of the KIPE Conference
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• 2017.07a
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• pp.443-444
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• 2017

본 논문에서는 배터리 팩 시험기에 사용되는 토폴로지인 3상 양방향 풀 브릿지 컨버터의 CC-CV 최적 설계에 대해 제안한다. 대용량 배터리 팩 시험기를 구성하는 소자들은 높은 정격이 요구되고 그에 따라 부피가 커지는 단점이 있다. 이러한 단점을 3상 양방향 풀 브릿지 컨버터를 사용하여 보완을 할 수 있지만 까다로운 회로 해석이 요구된다. 이 배터리 팩 시험기에 사용되는 복잡한 토폴로지를 스위칭 방식에 따라 간단하게 모델링하고, 그에 맞게 정전류 및 정전압 제어 시뮬레이션을 수행하여 얻은 결과를 통해 타당성을 검증하였다.