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2자유도 PI 제어기를 이용한 BLDC 전동기의 벡터제어에 관한 연구
이종현,성낙규,이상집,이승환,오봉환,이훈구,한경희 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
This paper describes the speed control method of BLDC Motor using TDOF PI ( Tow-degree of freedom PI ). PI control method generally used has difficulty in efficient speed control because speed response and load torque response interfere each other. It can't decrease the overshoot of motor speed w rm, and shorten the response time of load torque TL, at the same time according to the step alternation of speed reference w rm. Therefore TDOF PI is applied to BLDC Motor in order to supply these weak points of PI control method in this paper. TDOF PI can get the torque characteristic of short response time as well as stable and prompt speed adjustment by separate control for speed response and load torque response. The results from the tests of C program simulation and system construction show that TDOF PI is superior to PI control system in speed adjustment and load torque response.
( Nark Soon Park ),( Jae Hyun Choi ),( Dong Hun Lee ),( Young Jin Kim ),( Eun Sun Kim ),( Sung Woo Jung ),( Ja Seol Koo ),( Hong Sik Lee ),( Sang Woo Lee ) The Editorial Office of Gut and Liver 2007 Gut and Liver Vol.1 No.1
Colonoscopy is regarded as a relatively safe procedure and is widely performed. However, complications such as bleeding, perforation, and coagulation syndromes can occur during colonoscopy. Although bowel perforation is as rare as 0.4-1.9% of cases, it is the most serious and awful adverse event which can lead to a death. Colon perforation may occur as either intraperitoneal or extraperitoneal, or in combination. Right subdiaphragmatic free air suggests intraperitoneal perforation while pneumoretroperitoneum, pneumomediastinum, pneumopericardium, and subcutaneous emphysema suggest extraperitoneal perforation. Combined intraperitoneal and extraperitoneal perforation is very rare. Herein, we present a case of combined intraperitoneal and extraperitoneal colon perforation which manifested as pneumoretroperitoneum, pneumomediastinum, pneumopericardium, and subcutaneous emphysema. The lesion was closed with endoscopic clipping. (Gut and Liver 2007;1:79-81)
노낙경 ( Nark Kyoung Rho ),권용현 ( Yong Hyun Kwon ),이가영 ( Ga Young Lee ),김원석 ( Won Serk Kim ),김계정 ( Kea Jeung Kim ) 대한피부과학회 2007 대한피부과학회지 Vol.45 No.10
Background: Chilblain or pernio is a cold-induced, inflammatory skin problem which occurs usually on acral areas bilaterally. Because chilblain commonly develops in cold, damp climates, many soldiers may experience occupational chilblain during military service in Korea. Objective: The purpose of this study is to analyze the clinical characteristics of chilblain in Korean soldiers. Methods: We reviewed the clinical findings in 199 patients with chilblain who visited the department of dermatology, Armed Forces Capital Hospital during the 5-year period from 2002 to 2007. We investigated the epidemiology, aggravation factors, duration of the disease, clinical manifestations and treatment. Results: The results were as follows; The average age was 21.51±1.86 years old. The chilblain usually developed during winter and the duration of symptoms ranged from 1 day to 4 years. All patients developed skin lesions on acral areas. Erythematous skin lesions were observed in 133 patients and purpuric lesions were seen in 56 patients. The lesions were symmetrical in 171 patients 43 patients had history of recurrence. Treatment includes nifedipine and pentoxyfilline. The supportive treatment includes rest and keeping warm, topical corticosteroids or antibiotics and oral antihistamine, analgesics, or antibiotics. Conclusion: This investigation is expected to help understand and obtain more information on chilblain. (Korean J Dermatol 2007;45(10):996∼1003)
Survey on Resident Education for Surgical Dermatology in South Korea
Jo Seong Jin,Lee Hyun Mo,Rho Nark-Kyoung,Kim Min Sung,Ryu Hwa Jung,Kim Hoon-Soo,Park Byung Cheol,Roh Mi Ryung,Seo Suk Bae,Kim Hyojin,Seo Young-Joon,Li Kapsok,Huh Chang Hun,Song Ki Hoon,Seo Kyle K.,Seo 대한피부과학회 2024 Annals of Dermatology Vol.36 No.3
Background: With the increasing demand for surgical procedures in dermatology, resident education in surgical dermatology has become important for delivering high-quality treatment. However, it remains unclear if a sufficient number of residency programs with quality standards exist, as there has been little research on this subject in South Korea. Objective: To identif y the status of surgical dermatology education among residents and assess dermatologists’ perceptions of the subject. Methods: A 35-question sur vey was developed and distributed to all resident training hospitals and local clinics listed by the Korean Society of Dermatologic Surger y. Only third- and fourth- year residents were included and board-certified specialists from training hospitals and local clinics responded to the sur veys. Results: Sur vey participants included 88 residents and 120 specialists of whom one-quarter of the residents attended regular monthly educational sessions. Most residents (93%) participated in cosmetic procedures, and many performed laser therapy. However, the opportunity for toxin or filler injection was rare, with only 12% of the residents having experience with filler injec- tions. In response, 49% of residents and 32% of specialists said that more cosmetic training was required, whereas 28% of residents and 50% of specialists said that more training for both cosmetic and conventional surgeries was necessar y. Conclusion: The sur vey demonstrated a need for more training programs in surgical dermatol- ogy during residency and a perception gap between residents and specialists. Therefore, devel- oping educational residency programs that focus on basic dermatologic surger y principles and their applications in cosmetic procedures is essential.
김길동(Gil-Dong Kim),한영재(Young-Jae Han),박현준(Hyun-Jun Park),성낙규(Nark-Kuy Sung) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
In this paper, we studies VVVF inverter for 1C4M propulsion system of urban rail traction. This inverter is consisted of inverter stack, DB unit, and control unit. To prove performance of inverter carry out main track test. From test for VVVF inverter verifies excellent performance.
Twin converter를 이용한 전자식 안정기에 관한 연구
이상집(Sang-Chip Lee),한홍일(Hong-Il Han),성낙규(Nark-Kuy Sung),백동현(Dong-Hyun Baek),김성남(Sung-Nam Kim),한경희(Kyung-Hee Han) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
The rectifier circuit has been used in the various fields of inverter progress. This is simple and low price. Otherwise, it has many problems in harmonic, low power factor and etc.<br/> This paper use the twin converter of two jewel booster. It doesn't need the detection of voltage, current and control PWM. The twin converter has stably the rectification source. Also, the circuit is used a half-bridge inverter in the electronic ballast for lighting. Therefore, this method is confirmed in high efficiency.