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- 저자 : 김수홍(Kim, SuHong) (검색결과 255 건)
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H-Bridge 7레벨 인버터를 이용한 유도전동기 구동시스템의 노이즈 저감을 위한 출력 필터설계
김수홍,안영오,김윤호,방상석,김광섭,Kim, Soo-Hong,Ahn, Young-Oh,Kim, Yoon-Ho,Bang, Sang-Seok,Kim, Kwang-Seob 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.3
일반적으로 PWM인버터에 발생된 고조파와 노이즈는 스위칭 주파수, dv/dt와 di/dt, PWM 스위칭 방법에 의해 영향을 받는다. 멀티레벨 인버터가 고전력 시스템에 적용되어 낮은 주파수에서 동작할 때 이것은 큰 고조파 성분과 노이즈를 발생하게 된다. 따라서 멀티레벨 인버터에 출력 필터가 요구된다. 본 논문에서는 H-bridge 7레벨 인버터 시스템을 사용한 3상 유도 전동기 구동 시스템의 고조파와 노이즈 감소를 위해 출력 필터를 설계하였다. 가격이 저렴하고 간단한 구조를 가지며, 고조파와 노이즈를 효과적으로 감소시킬 수 있는 수동필터는 멀티레벨 인버터 시스템을 사용한 3상 유도전동기 구동시스템에 적용되었다. 설계된 시스템은 향상되었고, 시뮬레이션과 실험을 통해 그 타당성을 증명하였다. In general, the generated harmonics and noise of the PWM inverter are affected by PWM switching method, switching frequency, dv/dt and di/dt. Since multilevel inverters are often applied to the high power system, and operates with low switching frequency, theyproduce large size of harmonic contents and noise. Thus it is necessary to install output filters in the multilevel inverter. In this paper a filter design approach for the harmonic and noise reduction the three phase induction motor driving system using H-bridge 7-level inverter system is presented. The passive filter that has low cost and simple structure and can effectively reduce harmonics and noise, is designed and applied to the three phase induction motor drive having multilevel inverter system. The designed system is implemented and verified by simulation and experiments.
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김수홍,조종만,남태우,임재홍,박상일,Kim, S.H.,Cho, J.M.,Nam, T.W.,Lim, J.H.,Pack, S.I. 대한의용생체공학회 2006 의공학회지 Vol.27 No.5
Due to damaged vertebrae nerves, serious disease and aging, patients who have to lie down for long period of time need to exercise to maintain up-right standing position and recover their paralytic leg. This study describes a development of an intellectual tilt table which can provide a patient with rehabilitating condition. This can be possible by measuring and displaying the hee bent angle and pressure for each foot during exercise in real time. It is expected that the patient's exercising effect can increase by monitoring these two values during exercise.
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김수홍,조용훈,유제호,Kim, Soo-Hong,Cho, Yong-Hoon,Ryu, Je-Ho 대한소아외과학회 2010 소아외과 Vol.16 No.2
Congenital diaphragmatic disease is one of the common major congenital anomalies, and its mortality remained still high despite recent medical advances. The aim of this study is to examine the clinical characteristics of congenital diaphragmatic diseases. A total of 39 patients with congenital diaphragmatic disease that underwent surgery from January, 1997 to December, 2009 at Pusan National University Hospital were included in this study. Medical records were retrospectively reviewed. The male to female ratio was 30:9. Six out of 39 cases died (NS) before surgery, 17 patients had Bochdalek's hernia (BH), 11 patients hiatus hernia (HH), 4 diaphragmatic eventration (DE), and 1 Morgagni hernia (MH). There were no differences in mean birth weight and mean gestational age. NS (83.3 %). BH (35.3 %) was diagnosed more frequently than other diseases in the prenatal period. Three patients (17.6 %) of BH expired due to pulmonary hypoplasia and 1 patient had co-existing congenital heart disease. BH was diagnosed more frequently in the prenatal stage and had a higher motality rate than other conditions. Therefore, BH needs to be concentrated more than other anomalies.
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근막통증증후군의 통증유발점 치료를 위한 멀티어레이 전극과 프로그램 가능한 다채널 전기자극기 개발
김수홍,김수성,전계록,Kim, SooHong,Kim, SooSung,Jeon, GyeRok 대한의용생체공학회 2015 의공학회지 Vol.36 No.5
In this study, Multi-Array Electrodes (MAE) and Programmable Multi-channel Electrical Stimulator (PMES) were implemented for firing Trigger Points (TPs) of the patient with Myofascial Pain Syndrome (MPS). MAE has 25 Ag/AgCl electrodes arranged in the form of array ($5{\times}5$) fabricated with flexible pad, which are applicable to be easy-attached to curved specific region of the human body. PMES consisted of 25 channels. Each channel was to generate various electric stimulus patterns (ESPs) by changing the mono-phasic or bi-phasic of ESP, On/Off duration of ESP, the interval between ESP, and amplitude of ESP. PMES hardware was composed of Host PC, Stimulation Pattern Editing Program (SPEP), and Multi-channel Electrical Stimulator (MES). Experiments were performed using MAE and PMES as the following. First experiment was performed to evaluate the function for each channel of Sub- Micro Controller Unit (SMCU) in MES. Second experiment was conducted on whether ESP applied from each channel of SMCU in PMES was focused to the electrode set to the ground, after applying ESP being output from each channel of SMCU in PMES to MAE.
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김수홍,Kim, Soo-Hong 한국정보처리학회 2003 정보처리학회논문지D Vol.10 No.7
This paper describes the IPP (Internet Printing Protocol), a standard that makes network setup for printers potentially much easier and, not so incidentally, also user can print over the Internet and specifies an implementation of IPP client/server system. It allows the system administrator and operators to control IPP system users and printer devices. The focus of this effort is optimized capabilities the security features for authentication, authorization, and policies, also improved compatibility with existing WP devices. Finally this paper presents conclusions and further researches. 본 연구에서는 인터넷 망을 기반으로 하는 인쇄 표준인 인터넷 인쇄 프로토콜(WP)에 대하여 소개하고 UP 클라이언트/서버 시스템 구현을 위하여 각 클라이언트와 서버의 기능에 대해 자세히 논의하였다. 특히 효율적인 IPP 클라이언트/서버 시스템 활용을 위하여 사용자그룹, 프린터그룹 등의 관리기법을 채택하여 시스템 운영자와 관리자의 기능을 강화하고 효과적으로 IPP 시스템 사용자나 프린터를 관리할 수 있도록 구현하였다. 또한 IPP 표준옳 사용하는 타 회사 제품과의 호환성을 최대한 확보하는데 노력하였다. 그리고 마지막으로 앞으로의 연구 방향을 제시하였다.
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자동혈압계 점검을 위한 액추에이터 기반의 혈압 시뮬레이터 개발
김수홍,이승준,임문혁,박혜민,강민석,김건호,남경원,Soo Hong Kim,Seung Jun Lee,Mun Hyeok Lim,Hye Min Park,Min Seok Gang,Gun Ho Kim,Kyoung Won Nam 대한의용생체공학회 2024 의공학회지 Vol.45 No.1
Accurate measurement of blood pressure is essential for classifying an individual's disease, identifying blood pressure-related risks, and managing health. Due to the environmental and health hazards of mercury sphygmomanometers, automatic sphygmomanometers using the oscillometric method are widely used in hospitals as well as in general homes, and have established themselves as a practical standard sphygmomanometer. In this study, we developed a blood pressure simulator using an actuator that provides simulated pressure to an automatic blood pressure cuff. The developed blood pressure simulator adopts an arm-shaped cylindrical shape similar to the situation in which a person measures blood pressure with an automatic blood pressure monitor, and implements a method of transmitting pressure to the cuff using a pressure plate. Accuracy was evaluated through the mean and standard deviation of the difference with the commercialized blood pressure simulator BP PUMP 2, and reproducibility was confirmed using two automatic blood pressure monitors. The developed blood pressure simulator enables automatic blood pressure monitoring in a simple manner and also meets the evaluation standards for accuracy and reproducibility. In the future, as a standardized blood pressure simulator, it is expected to be of great help in evaluating and verifying the performance of automatic blood pressure monitors by supplementing precise hardware and software and building a blood pressure database.
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