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TMS320F240을 이용한 PWM 인버터 유도전동기 구동 시스템의 전도노이즈 저감을 위한 스위칭 기법
朴奎炫,金利勳,元忠淵,金奎植,崔世琓,咸年根 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-
PWM 인버터에 의해 구동되는 유도전동기에 발생되는 고주파 커먼 모드 전압은 전도성 EMI, 전동기 접지전류, 베어링 전류 및 다른 원치 않는 결과의 주원인이 된다. 인버터 제어의 무효벡터 스위칭 상태는 나머지 유효벡터 스위칭 상태에 비교하여 큰 커먼 모드 전압을 일으킨다. 그러므로 이 논문은 커먼 모드 전압을 완화하는 스위칭기법을 다룬다. 즉 정현파 PWM기법을 기본으로 한 커먼 모드 전압 제거방법을 제안하였다. PWM 신호는 각각의 정현파 기준신호와 120˚위상차가 나는 3개의 캐리어 파형과 비교하여 발생된다. 시뮬레이션과 실험적결과는 제안된 PWM 기법에서 커먼 모드 전압이 종래의 PWM 기법보다 약 66% 더 저감됨을 보였다. High frequency common mode voltage produced by PWM inverter fed induction motor is a major cause of conducted EMI. creation motor ground currents, bearing currents and other hamful products. The zero switching states of inverter control invoke large in comparison with the non-zero switching state of inverter control. We proposed a common mode voltage reduction method based on sinusoidal PWM technique. PWM signal are generated by comparing respective sinusoidal reference signal with three triangular carrier wave displaced of 120˚. Simulation and experimental result show that common mode voltages in the propsed PWM technique are reduced by approximate 66% more than conventional PWM technique.
김세훈,장석종,박해근 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2
It has been well known that respiratory status has affected the intracranial pressure by' changing the brain blood flow, and also ethanol has affected the respiratory system by inhibiting the respiratory center and has affected cardiovascular system by inhibiting the cardiac performance and decreasing the total peripheral resistance. However, effect of ethanol on intracranial pressure has not been studied satisfactorily. Thus, following experiment was performed to examine the change of the intracranial pressure after ethanol administration in the cats. Ethanol was infused intravenously by lg ethanol per kg body weight for 15 minutes. Intracranial pressure was measured through balloon inserted between epidura and skull. Arterial blood pH, Po_2, Pco_2, ethanol concentration were measured. The results obtained are surnmerized as follows. Blood ethanol concentration increased by linear and peaked at 15 minutes(blood ethanol concentration was 409±31 mg%). Po_2, Pco_2. and pH at 15 minutes were 80. 3±5. lmmHg, 49.2±3.3mmHg and 7.24 =0.015 respectively. Blood pressure began to decrease and arterial pulse pressure began to increase at 10 minutes and more and more at 15 minutes respectively. Intracranial pressure began to increase at 10 minutes (blood ethanol concentration was 316±33 mg%) and peaked as 168.7±11.4% contrast to control at 15 minutes and also amplitude of intracranial pulse wave was increased. From the above results, it was suggested that intracranial presssure and amplitude of intracranial pulse wave were increased significantly by inhibiting respiratory center and thereby dilatating cerebral blood vessels with intravenous ethanol administration.
거제도 구천호와 연초호의 곤충과 저서성 대형무척추동물의 분포
정선우,박정원,전세근,윤춘식 7개 국립대학교 환경연구 논문집 공동발행 위원회 2004 공업기술연구 Vol.4 No.-
The community structures of benthic macroinvertebrates and insects of reservoirs Yeoncho and Gucheon in Is. Geoje were studied. The surveyed sites were three streams and waterfronts each lake. The Collection was performed from May to October of 2004. As a result, total macroinvertabrates collected in the reservoir Yeoncho were 2 phyla, 2 classes, 8 orders, 15 families, 17 genera and 18 species. IN insects, 12 orders, 52 families, 89 genera and 95 species were identifies. Total macroinvertabrates collected in the reservoir Gucheon were 3 phyla, 4 classes, 10 orders, 15 families, 18 genera and 18 species. In insects, 8 orders, 45 families, 92 genera and 101 species were identified. Dominant species of benthic macroinvertebrates and insects in reservoir Yeoncho were Macrobrachium nipponense and Nysius(Nysius) plebejus respectively. The total species richness and species diversity of benthic macroinvertebrates in the reservoir Yeoncho was 32.78 and 1,77 respectively. The total species richness and species diversity of benthic macroinvertertebrates in the reservoir Gucheon was 36.48 and 1.88 respectively.
합천군 정양지와 박실지의 곤충 및 저서성 대형무척추동물의 분포
정선우,전세근,김인택,박정원,윤춘식 7개 국립대학교 환경연구논문집 공동발행 위원회 2005 공업기술연구 Vol.5 No.-
The community structures of benthic macro-invertebrates and insects of reservoirs Jeongyang and Pakasil in Hapcheon-gun were studied. The surveyed sites were three streams and waterfronts of each lake. The Collection was performed from April to October of 2005. As a result, total macreo-invertebrates collected in the reservoir Jeongyang were 3 phyla, 4 classes, 12 orders, 29 families and 56 species. In insects, 12 orders, 71 families and 167 species were identified. Total macro-invertebrates collectd in the reservoir Paksil were 2 phyla, 3 classes, 8 orders, 19 families and 36 species. In insects, 11orders, 50 families and 137 species were identified.Dominant species of benthic macro-invertebrates and insects in reservoir Jeongyang were Chiromomus sp and Nysius plebejus respectively. Dominant species of benthic macro-invertebrates and insects in reservoir Paksil were Physella acuta and Nysius plebejus respectively. The total species richness and species diversity of benthic macro-invertebrates in the reservoir Jeongyang was 16.88 and 1.43 respectively. The total species richness and species diversidty of benthic macro-invertebrates in the reservoir Paksil was 12.12 and 1.10 respectively. The total species richness and species diversity of insects in the reservoir Jeongyang was 56.65 and 1.99 respectively. The total species richness and species diversity of benthic macro-invertebrates in the reservoir Paksil was 47.65. and 0.90 respectively.
Case Reports : Aeromonas hydrophila Sepsis Mimicking Vibrio vulnificus Infection
( Se Young Park ),( Hyun Min Nam ),( Kun Park ),( Seok Don Park ) 대한피부과학회 2011 Annals of Dermatology Vol.23 No.1S
Aeromonas hydrophila is a facultatively anaerobic, asporo-genous gram-negative rod that has often been regarded as an opportunistic pathogen in hosts with impairment of a local or general defense mechanism. A 68-year-old alcoholic woman presented with shock and gangrene on the right arm. At first, her clinical presentations were severe painful erythematous swelling that worsened within a few hours with development of gangrene, edema, and blisters. Bullous fluid and blood cultures yielded A. hydrophila. Histopathological findings of sections obtained from the vesicle revealed subepidermal vesicles; necrosis of the epidermis, papillary dermis, and subcutaneous fat; and massive hemorrhage in the subcutis. Despite all efforts to save the patient, she died 8 hours after admission. Clinical features of A. hydrophila sepsis resemble those of Vibrio vulnificus sepsis. Therefore, in addition to the case report, we compared the cultural, biochemical, and morphological differences between A. hydrophila and V. vulnificus for facilitation of early and accurate identification of the causative agent. (Ann Dermatol 23(S1) S25~S29, 2011)
Park, Yong Il,Kim, Hyung Min,Kim, Jeong Hyun,Moon, Kyung Chul,Yoo, Byeongjun,Lee, Kang Taek,Lee, Nohyun,Choi, Yoonseok,Park, Wooram,Ling, Daishun,Na, Kun,Moon, Woo Kyung,Choi, Seung Hong,Park, Hong Se WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.42
<P><B>Dual‐modal in vivo tumor imaging and photodynamic therapy using hexagonal NaYF<SUB>4</SUB>:Yb,Er/NaGdF<SUB>4</SUB> core–shell upconverting nanoparticles combined with a photosensitizer</B>, chlorin e6, is reported. Tumors can be clearly observed not only in the upconversion luminescence image but also in the magnetic resonance image. In vivo photodynamic therapy by systemic administration is demonstrated under 980 nm irradiation.</P>
Se-Chun Park,You-Sung Kim,Ho-Youb Cho,Sung-Dae Choi,Mi-Sun Yoon,Tae-Yun Kim,Kun-Woo Park,박종선,김수원 한국전자통신연구원 2014 ETRI Journal Vol.36 No.5
In current NAND flash design, one of the most challengingissues is reducing peak current consumption (peak ICC), as itleads to peak power drop, which can cause malfunctions inNAND flash memory. This paper presents an efficientapproach for reducing the peak ICC of the cache program inNAND flash memory — namely, a program Cache Busy Time(tPCBSY) control method. The proposed tPCBSY controlmethod is based on the interesting observation that the arrayprogram current (ICC2) is mainly decided by the bit-line biascondition. In the proposed approach, when peak ICC2becomes larger than a threshold value, which is determined bya cache loop number, cache data cannot be loaded to the cachebuffer (CB). On the other hand, when peak ICC2 is smallerthan the threshold level, cache data can be loaded to the CB. As a result, the peak ICC of the cache program is reduced by32% at the least significant bit page and by 15% at the mostsignificant bit page. In addition, the program throughputreaches 20 MB/s in multiplane cache program operation,without restrictions caused by a drop in peak power due tocache program operations in a solid-state drive.