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펠티어 소자를 사용한 Low Drift Flux Meter의 기초연구
김철한,허진,신광호,사공건,Kim, Chul-Han,Heo, Jin,Shin, kwang-Ho,Sa-Gong, Geon 한국전기전자재료학회 2001 전기전자재료학회논문지 Vol.14 No.11
Fluxmeter is a measuring instrument the magnetic flux intensity by means of an integration of the voltage induced to a search coil to unit time. It also is required to a precise integrator since the voltage induced to a search coil has a differential value of the flux ${\Phi}$ to unit time. In this study, a bias current which is a main problem of the integrator in a drift troublesome depending on the temperature of a FET is investigated. We have confirmed that the temperature dependence of both the bias current of a integrator using the FET and the reversal saturated current of the minor carrier in a P-N junction of a semiconductor were the same. The property of a commercial integrator goes rapidly down with increasing temperature. The bias current of a FET is increased twice as much with 10$^{\circ}C$ increment. As a result, the low drift integrator could be developed by setting the lower temperature up with a pottier device.
김철한,김현성,Kim, Chul-Han,Kim, Hyun-Sung 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.6
Purpose: Ganglion cysts of peripheral nerve are uncommon. Ganglion cysts located within the nerve and extraneural ganglia that cause symptomatic nerve compression have been reported. We report an unusual case of epineural ganglion cyst confined to the epineurium of the sural nerve at the foot. Methods: A 45-year-old woman was referred because of a mass on the foot. She had six months' history of pain and numbness in the right small toe. During the examination of the lesion, multinodular cystic mass was identified arising from the epineurium of the sural nerve. The nerve fascicles were compressed by the cyst, but the cyst wall clearly did not invade the fascicle. With the aid of surgical microscope, the epineural cyst was completely excised along with epineural tissue to which it was attached, and the sural nerve was decompressed. There was no relationship between the cyst and either the joint capsule or tendon sheath. Since the cyst was on the periphery of the nerve it was possible to remove the cyst intact without damaging the underlying fascicles. Results: The postoperative course was uneventful. Pathologic examination showed a ganglion cyst with a degenerated collagen fibers and contained a yellowish, jelly-like mucinous substance. No neural elements were identified within the cystic wall. Her sensory impairment improved progressively. At the 15 months follow-up, she was asymptomatic with no neurological deficits. Conclusion: Rarely, ganglion cysts can involve peripheral nerves, leading to varing degrees of neurological deficits. Intraneural intrafascicular ganglion may be difficult to separate from the neural elements without nerve injury. Epineural ganglion, subcategorized as intraneural extrafascicular ganglion, can be removed without damage to the underlying nerve.
김철한(Chul-Han Kim),이정태(Jung-Tae Lee) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1A
최근 컴퓨터 및 통신 기술의 발전으로 인터넷 전화 서비스가 증가하고 있다. 지금까지의 인터넷 전화 서비스는 1:1 방식의 서비스가 주류를 이루었으나, 점차 다자간 음성 채팅, 원격 강의 등과 같은 N:N 방식의 음성 멀티캐스팅 서비스에 대한 수요가 급증하고 있다. 그러나 기존의 음성 멀티캐스팅 시스템은 별도의 멀티캐스팅 서버 구축, 부하 집중, 사용자 수의 증가에 따른 음성 트래픽 증가 등의 문제로 일정한 통화품질을 유지하기 어렵다는 단점이 있다. 따라서, 본 논문에서는 이와 같은 문제를 개선하기 위한 링 방식의 음성 멀티캐스팅 시스템을 제안하고, 이 시스템의 성능 분석을 통하여 최소 4명의 참여자까지 일정한 음성품질이 보장됨을 확인함으로써 타당성을 검증하였다.
김철한 ( Chul Han Kim ),석기태 ( Ki Tae Suk ),김재우 ( Jae Woo Kim ) 대한소화기학회 2008 대한소화기학회지 Vol.52 No.2
Salmonella infection can cause an asymptomatic intestinal carrier state or clinical diseases such as enterocolitis presenting abdominal pain, fever, vomiting, or diarrhea. Salmonella usually invades Peyer`s patch of terminal ileum or ascending colon. Sepsis is not common and acute renal failure secondary to rhabdomyolysis is rare. The causes of rhabdomyolysis are trauma, excessive exercise, alcohol, seizure, metabolic abnormality, and infection. Infections account for less than 5% of the reported causes of rhabdomyolysis and resulting acute renal failure. The mechanisms underlying rhabdomyolysis due to infection are direct muscle invasion, toxin production, and nonspecific effects that can occur with infections such as fever, dehydration, acidosis, and electrolyte imbalance. We report a case of sepsis and acute renal failure secondary to rhabdomyolysis associated with Salmonella infection. (Korean J Gastroenterol 2008;52:110-114)
김철한 ( Cheol Han Kim ),김윤진 ( Yun Jin Kim ),전계록 ( Gye Rok Jeon ),노정훈 ( Jung Hoon Ro ),유주연 ( Ju Yeon Yoo ),박근철 ( Geun Chul Park ),전아영 ( Ah Young Jeon ) 한국센서학회 2011 센서학회지 Vol.20 No.2
In this study, a compact wireless vibration measurement system was developed using a 3-axial accelerometer in order to evaluate the vibration stimulation system. A low power microprocessor chip integrated with 2.4 GHz RF transceiver was used for the wireless data communication. To evaluate the system, the frequencies and accelerations from the vibration stimulation system were measured using an LVDT sensor and a vibration measurement system. The average frequency difference by the measurement system was less than 0.1 Hz, and the standard deviation of frequencies estimated by the LVDT sensor and the accelerometer was below 0.08 Hz. The developed system was applied to access a vibration stimulation system for the future study. The average acceleration difference of the central and peripheral point of the stimulation system was less than 0.0005 g(1 g=9.8 m/s2), and the standard deviation of the acceleration was below 0.004 g, which shows the usefulness of the wireless vibration measurement system.
Micro - Elisa 검사와 뇌전산화단층촬영으로 진단한 뇌실질 스파르가늠증 1 예
김철한(Chul Han Kim),박진현(Jin Hyun Park),김원천(Won Tsen Kim),이성수(Sung Soo Lee),한용표(Yong Pyo Han),한은경(Eun Kyung Han),최일생(Il Saing Choi) 대한내과학회 1989 대한내과학회지 Vol.37 No.5
N/A We report a case of intracerebral sparganosis diagnosed by micro-ELISA test and brain C-T scan. This 45-year-old male who had a history of having eaten frogs frequently, had suffered from uncontrolled headache with medication far about 1 year. Brain CT scan revealed a migrated low density lesion from Rt. temporo-parietal to Rt, frontal lobe. In cerebrospinal fluid, micro-ELISA test to sparganum was positive. Right frontal osteoplastic craniotomy was performed and a live sparganum mansoni was successfully removed from intracerebral region.
비틀림 테이프에 의한 이중관형 열교환기의 성능에 관한 연구
김두천,김철한,Kim, Doo-Chun,Kim, Chul-Han 대한설비공학회 1982 설비저널 Vol.11 No.2
Friction losses and heat transfer characteristics were studied experimentally for fully developed tubulent flow in tubes with twisted tape swirl generators. Data were obtained for pitch- to-diameter ratios from 8.10 to 25.71 with water under forced convection cool ins conditions. The experimental results of this and that of previous swirl flow investigation by Smithberg and Landis were compared. Nusselt number and friction data are combined in a constant pumping power comparision for swirl and straight flow, which indicates that improvement of 2.0 times in the best performance can be obtained with twisted tape-insert tube. A twisted tape-insert tube is recommended in the case of low temperature difference in heat-exchanger.