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A Study on the Solution of Three-Phase Imbalance due to TCR Inductance Difference
Pyo Su-Han,Oh Jeong-Sik,Kim Tae-Hun,Che Jun-Soo,Park Jang-Hyun,Lee Myoung-Jin,Park Tae-Sik 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.1
Thyristor Controlled Reactor (TCR) has been used to improve power quality through fi ring angle control by parallel connection to the system in the form of ∆-connection. The inductances of three-phase TCR are assumed to be a same value, but a diff erence is generated in the inductance value of each phase in the manufacturing process. Due to the diff erence in threephase inductance, a conventional TCR control algorithm causes the imbalance of phase voltage. So, this paper proposes a method to solve the phase imbalance problem of TCR using a modifi ed fi ring angle control scheme, and the performance of the proposed method was verifi ed through Matlab simulation.
개의 실험적 췌외분비부전에서 단백과 탄수화물의 흡수가 지방 흡수에 미치는 영향
정준표,정재복,박승우,이세준,문병수,송시영,이관식,이상인,문영명,강진경,Eugene, P. Dimagno 대한소화기학회 2002 대한소화기학회지 Vol.40 No.2
목적: 췌외분비부전에 의한 지방변의 치료는 아직 난제로서 이를 해결하기 위해서는 지방 흡수에 영향을 미치는 요인을 밝히는 것이 필요하다. 식이가 지방 흡수에 영향을 미치는 것으로 알려져 있으나, 아직 지방, 단백 및 탄수화물 등의 흡수에 있어서 상호 관련성 여부에 대해서는 잘 알려져 있지 않다. 본 연구에서는 개의 실험적 췌외분비부전에서 지방, 단백 및 탄수화물 등의 흡수가 효소 제제(세균성 리파제, 돼지 췌효소제) 및 용량 의존적인지, 지방 흡수가 단백 및 탄수화물의 흡수와 연관되는지 등을 알아보고자 하였다. 대상 및 방법: 20 ㎏ 내외의 암컷 mongrel 개 5마리를 사용하였고, 주-부췌관을 결찰-분리하여 췌외분비 부전을 유발하였다. 효소제의 제형은 모두 분말을 사용하였으며, 용량은 세균성 리파제와 돼지 췌효소제 각각 7.500, 15,000, 30,000 IU을 사용하여 무순서로 실험하였고, 무치료 대조실험도 시행하였다. 실험식이로는 고지방식이{850 Cal, 지방 43% (80.2 g), 단백질 36% (151.6 g), 탄수화물 21% (98.2 g)}를 사용하였다. 72시간 동안 대변을 수집하여 대변내 지방, 단백 및 탄수화물의 양을 측정하였고, g/24 hr로 환산하였다. 지방, 단백 및 탄수화물의 coefficient of fat absorption (CFA), coefficient of protein absorption (CPA) 및 coefficient of carbohydrate absorption (CCA)을 계산하였으며, 다중회귀분석을 이용하여 통계 처리하였다. 결과: CFA, CPA 및 CCA 모두 췌효소제의 용량 의존적으로 증가하였으며(각각 p<0.001), CFA와 CPA는 돼지 췌효소제가 세균성 리파제보다 더 컸으나(각각 p=0.002 및 p<0.001), CCA는 효소제의 종류와는 무관하였다. CPA가 증가할수록 CFA는 증가하였으며(p<0.001), CCA가 증가하여도 CFA는 증가하였다(p<0.001). 결론: 개의 실험적 췌외분비부전에서 지방, 단백 및 탄수화물의 흡수는 췌효소의 용량 의존적으로 증가하고, 돼지 췌효소제가 세균성 리파제보다 지방 및 단백의 흡수에 유리하며, 단백과 탄수화물의 증가는 지방의 흡수를 증가시킨다. 따라서 단백과 탄수화물의 흡수를 극대화하도록 식이를 조절하면 지방 흡수를 증가시킬 수 있을 것으로 생각된다. Background/Aims: Interactions among fat, protein, and carbohydrate absorption may play a role in the treatment of steatorrhea. We determined in canine exocrine pancreatic insufficiency (EPI) whether fat, protein, and carbohydrate absorptions are dependent on the pancreatic enzyme preparation (bacterial lipase, BL; porcine lipase, PL) and whether absorption of fat is related to absorptions of protein and carbohydrate. Methods: Five dogs underwent ligation of pancreatic ducts. Then, seventy two-hour fecal balance studies were performed while a high fat meal (fat 43%) was given. Powdered BL or PL was given at doses of 0, 7,500, 15,000, and 30,000 IU. Stool fat, protein, and carbohydrate were measured and coefficients of fat (CFA), protein (CPA), and carbohydrate (CCA) absorptions were calculated. Multiple regression analysis was used for statistical analysis. Results: CFA and CPA increased preparation (PL is better than BL) and dose dependently. However, CCA increased dose-dependently but not preparation-dependently. Fat absorption increased as protein and carbohydrate absorption increased (p<0.001). Conclusions: In dogs with EPI fed a high fat diet, porcine pancreatic enzyme increases fat and protein absorption greater than bacterial lipase, and the increase of fat absorption is related to the increase of protein and carbohydrate absorptions.
명성식(Seong-Sik Myoung),홍영표(Young-Pyo Hong),장병준(Byung-Jun Jang),이용식(Yongshik Lee),육종관(Jong-Gwan Yook) 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.10
본 논문에서는 기존에 제안된 소형화 기법을 응용하여 단일 제어 전압을 갖는 소형화된 튠어블 필터를 제안하였다. 기존에 제안된 소형화 기법은 양쪽이 접지된 구조와 캐패시터를 이용하여 임의의 평행 결합 선로 필터를 매우 간단하게 소형화 할 수 있다. 이때 각 단에서 소형화를 위해 사용되는 캐패시턴스의 값이 소형화된 길이에 상관없이 항상 동일한 비를 유지하는 것을 이용하여 단일 제어 전압을 가지며, 동일한 특성을 유지하는 튠어블 필터를 제안하였다. 제안된 기법을 검증하기 위해 900 ㎒ 대역의 0.5 ㏈ 리플을 갖는 3단 체비셰프(Chebyshev) 필터를 튠어블 필터로 제작하였다. 제작은 Toshiba사의 1SV277 가변 용량 다이오드를 이용하여 타코닉사의 CER-10 기판에 구현하였다. 제어 전압이 0.5~4 V로 변함에 따라 필터의 중심 주파수가 606~944 ㎒로 338 ㎒ 변하였다. 제안된 튠어블 필터는 제어 전압이 증가함에 따라 손실이 증가하며, 대역폭이 약간 변하는 것을 제외하고 본래의 특성을 잘 유지하였다. This paper presents the varactor-tuned miniaturized hairpin tunable filter with a single control voltage. The previously proposed miniaturization method is a very straight-forward method to miniaturize a parallel coupled-line filter. In this paper, the miniaturized hairpin tunable filter is proposed with the constant ratio rule of that the capacitances of the each stage always have constant ratio without any dependency to miniaturized electrical length. To show the validity of the proposed method, a 3rd order 0.5 ㏈ ripple Chebyshev filter with a center frequency of 900 ㎒ and a fractional bandwidth(FBW) of 10 % was designed and fabricated. The fabricated filter was based on CER-10 substrate of Taconic Inc. with 1SV277 varactor diode of Toshiba Inc. The center frequency of the fabricated filter can be changed from 606 ㎒ to 944 ㎒, 338 ㎒ with the control voltage from 0.5 V to 4 V. The insertion loss of the proposed filter is increased with the increment of the control voltage, and the filter characteristics are well reserved expect of slight change of the bandwidth with the various control voltage.
A 3.1 to 5GHz Low-Loss Planar Filter for MB-OFDM UWB Applications
HONG, Young-Pyo,MYOUNG, Seong-Sik,YOOK, Jong-Gwan The Institute of Electronics, Information and Comm 2011 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.eb94 No.4
<P>A low-loss ultra-wide band (UWB) filter is presented, which uses miniaturized parallel coupled line along with an standard printed circuit board (PCB) technology. By analyzing even- and odd-mode impedances (in comparison with conventional parallel coupled lines) of miniaturized parallel coupled line, this structure provides tight coupling, thus, relaxing the requirements on physical dimensions width and spacing when designing broadband filters. A bandpass filter for Mode 1 (the first 3 sub-bands) in the 3.1-5GHz band for Multi-Band Orthogonal Frequency Division Multiplexing (MB-OFDM) UWB is realized and compared with a conventional parallel coupled line filter. The experimental results show as much as 0.9dB insertion loss improvement over the conventional counterpart.</P>
Radical Scavenging Effects of Propolis collected in Korea
Soon-ok Woo,In-pyo Hong,Sang-mi Han,Yong-su Choi,Ha-sik Sim,man-young Lee,Myoung-lyeol Lee 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.10
Propolis, bee glue is a sticky substances, which is used to prevent corruption of the ones who broke into the hive, and which is known as a substance that inhibits the growth of microorganisms within the hive. In order to use this propolis, is required to extract the active ingredients from the raw propolis. Mainly goes through the process of extraction with ethanol. Propolis is registered as health functional food for food and drug safety with a valid registration which is anti-oxidant effects and anti microbial effects of oralflora. Inthis study, in order to determine the antioxidant effect of propolis produced in various regions collected 58 regions. Antioxidant effects were tested by DPPH free radical scavenging effects method. Asa result, the propolis concentrations by 10, 50, 100, 500, 1000㎍ were 43, 73, 78, 82, and 73%, in Gangwon province, Gyeonggi Province, 57, 83, 83, 79, and 71%, Chungcheong Province, 55, 80, 80, 76, and 68%, Jeolla province 48, 75, 78, 78, and 71%, Gyeongsang province 47, 77, 81, 79, and 71%, respectively. More than a certain concentration was to determine antioxidant falling rather. These results can be said to suggest if you use the edible excess should be avoided.
Excess mortality among patients on dialysis: Comparison with the general population in Korea
( Hyung Yun Choi ),( Myoung Hee Kim ),( Hyun Wook Kim ),( Jung Pyo Lee ),( Jeong Hwan Lee ),( Jung Tak Park ),( Kyoung Hoon Kim ),( Hyeong Sik Ahn ),( Hoo Jae Hann ),( Dong Ryeol Ryu ) 대한신장학회 2014 Kidney Research and Clinical Practice Vol.33 No.2
Background: Although patients with end-stage renal disease (ESRD) experienceexcess mortality compared with the general population, the standardized mortalityratio (SMR) for Korean patients on dialysis has not yet been investigated. In thisstudy, we evaluated the SMR among all Korean ESRD patients on maintenancedialysis in 2009 and 2010, and compared it according to age categories, sex, anddialysis modality. Methods: We used data from all patients on maintenance dialysis between January 1,2009 and December 31, 2010 in Korea using the database of the Korean HealthInsurance Review and Assessment Service, and the SMR was determined by calculatingof the ratio between the number of actual deaths and expected deaths. Results: A total of 45,568 patients in 2009 and 48,170 patients in 2010 were includedin the analysis. The overall age- and sex-adjusted SMR was 10.3 [95% confidenceinterval (CI), 10.0-10.6] in 2009 and 10.9 (95% CI, 10.7-11.2) in 2010. The SMR forfemales was much higher than for males. The SMR gradually decreased withincreasing age groups. The overall SMR for maintenance hemodialysis patients waslower than that of peritoneal dialysis patients. Conclusion: The SMR among Korean ESRD patients is likely to be higher than in othercountries. Further evaluation is needed to attempt to improve the outcomes.