모바일용 White-LED Driver IC에 관한 연구

고영석,박시홍,Ko, Young-Seok,Park, Shi-Hong 한국전기전자재료학회 2009 전기전자재료학회논문지 Vol.22 No.7

In this study, we proposed WLED(White-Light Emitting Diode) driver IC for mobile applications. This IC drove WLED for mobile applications with low input voltage and high efficiency by using boost converter. The device was designed by using boost converter applied current-mode control algorithm and provided PWM(Pulse Width Modulation) & analog dimming. Designed IC consisted of bias block, drive block, control block, protection block. We confirmed this device worked well through a application PCB (Printed Circuit Board) test.

분양가 자율화이후 공동주택 단위평면의 변화경향에 관한 연구

고영석(Ko Young-Seok),이승조(Lee Seung-Jo),이경훈(Lee Kyoung-Hun),김용성(Kim Yong-Seong) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

After the enforcement of price deregulation of Apartments, Apartment houses get down to originality products. The housing market have been reorganized by the user and have demanding the development for discriminative unit plan. The purpose of this study is to study unit plans which have changed after price decontrol of apartment and to search for transformation factor and analyze into the tendency of the distinction plan of housing products. Apartment unit have analyzed from 85㎡ till 152㎡ private area; from the ten major construction corporations unit in Seoul metropolitan area From the chosen samples, first, unit plan is normalized from the ratio of front to side wall, bay, a room organization and a kind of room, number, and for examples of unit plan of apartment, the examples were analyzed with respect to change of a room organization, the number of a rooms, and the ratio of front wall to side wall have been investigated. Execute numerical analysis for quantification through Space Syntax theory. Finally, transformation tendency of an apartment unit plan after enforcement of price deregulation have been searched and analyzed by numerous factors. The results of the study are follows: after enforcement of price deregulation, unit plans of apartment lead to changes by layout to secure family's amenity and privacy, to secure feeling for open spacious tendency of flexibility.

바이오의약품 정제용 크로마토그래피 컬럼의 고효율 흐름 분배기 개발

고영석(Young-Seok Ko),이화정(HwaJung Ri),최수림(Su-lim Choi),김동일(Dong-Il Kim),박진호(Jean-Ho Park),이준철(Joon-Chul Lee) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.5

We developed a flow distributor for high-performance chromatographic processes during the purification of biopharmaceuticals. Twelve distributor candidates are provided, including four types of distributors with different-shaped holes, and three sub-types with different number of holes. We evaluated the flow distributor candidates by spreading bromophenol blue dye on the membrane , and selected the most suitable distributor Arc 45 deg. type. Using 10 ml columns with three different length-to-diamter (L/D) ratios (4.33, 0.92, and 0.34) of column, we measured peak asymmetry (As) values. The 10 ml column with 0.92 L/D ratio showed best As value. We also carried out flow experiments on the three sub-types of Arc 45 deg. distributors on the 0.92 L/D ratio 50 ml column and Arc 45 deg. 1:8 distributor showed best performance. The As values of this optimal flow distributor are 1.2 or less. In summary, this study provides optimal distributor values for chromatographic purification of biopharmaceuticals.

동통을 동반한 양측성 발음성 견갑골

신성룡(Sung-Ryong Shin),고영석(Young-Seok Ko),박용욱(Yong-Wook Park),이상수(Sang-Soo Lee),정운섭(Un-Seob Jeong),김도영(Do-Young Kim) 대한견주관절의학회 2005 대한견주관절학회지 Vol.8 No.2

ATmega128과 LabVIEW를 이용한 자동 온실시스템 구현

김제성(Je-Sung Kim),김승희(Seoung-Hee Kim),고영석(Young-Seok KO),이남길(Nal-Gil Lee),이성용(Seoung-Yong Lee),한새론(Sae-Ron Han),최관순(Kwan-Sun Choi) 한국정보기술학회 2012 Proceedings of KIIT Conference Vol.2012 No.11

본 논문은 ATmage128과 LabVIEW를 사용하여 온실내의 내부 환경을 자동으로 유지해주는 시스템이다. 온/습도 센서를 이용하여 온/습도를 측정하고 ATmage128에서 수치화여 블루투스를 통해 PC로 보내 LabVIEW에서 사용자에게 현재 온실내의 온/습도 상태를 알려주고, LabVIEW에서 설정한 조건에 따라 DAQ에서 신호를 보내 Fan과 DC펌프를 동작시켜 온실 내의 환경을 조절한다. In this paper, we implemented a system using ATmega128 and LabVIEW which automatically maintains the internal environment within a greenhouse. The system is acquired date form temperature/humidity sensor and transferred to PC using bluetooth. It can be controled by oprating a fan and DC pump according to condition the LabVIEW setup configuration and DAQ signal.

Occurrences of Pyogenic Arthritis of the Knee in Korea

Sung Il Shin(신성일),Kyung Won Song(송경원),Jin Young Lee(이진영),Seung Yong Lee(이승용),Gab Lae Kim(김갑래),Young Seok Ko(고영석),Hyung Seok Oh(오형석),Kun Ho Shin(신건호) 대한정형외과학회 2005 대한정형외과학회지 Vol.40 No.8

목적: 한국에서 슬관절 화농성 관절염의 원인을 분석한다. 대상 및 방법: 1994년 1월 1일부터 2005년 3월 31일까지 슬관절의 화농성 관절염으로 치료하였던 149예 가운데 균 검사에서 양성을 보였던 72예에 대하여 발생 빈도와 원인을 분석하였고. 환자의 평균 연령은 63세(46세부터 82세까지)였으며 70세 이상의 환자가 약 47% (34예)를 차지하였다. 결과: 정형외과에서 입원 치료 받은 총 환자 수에 대한 발생 비율은 입원 환자 1,000명당 7.4명(p<0.05)이었으며, 균 검사에서 양성으로 판명되는 비율이 약 48%를 보였다. 총 72예의 분석에서 슬관절에 선행 질환은 61예에서 확인할 수 있었는데 그 중 퇴행성관절염 41예, 류마티스관절염 20예로 대부분관절 질환을 갖고 있었다. 과거에 스테로이드나 HA의 관절 내 주사 요법의 경험이 있거나 혹은 침구 치료 등의 전통 요법을 받은 경우가 48예로서 약 67%의 환자가 슬관절에 대한 직접 치료를 받은 경험이 있었다. 주사를 시행한 횟수는 37예를 분석하였을 때 주사 약제와 관계없이 1회 내지 5회가 9예, 6회 내지 10회가 17예, 10회 내지 15회가 9예, 그밖에 16회에서 20회가 2예이었다. 결론: 슬관절의 화농성 관절염은 주로 관절강내 또는 관절주위 치료나 침술과 같은 의원성 원인 때문인 경우가 많다. Purpose: To analyze recent causes of the pyogenic arthritis of knee in patients in Korea. Materials and Methods: Among 149 cases of pyogenic arthritis of the knee treated in the Orthopedic Department of the University Hospital from 1 January 1994 to 31 March 2005, we identified the causative bacteria in 72 cases. The mean patient age was 63 years old (range, 46 to 82 years) and 47% (34 cases) were greater than 70 years of age. Results: The incidence of pyogenic arthritis of the knee in patients who had been discharged from the Orthopaedic Department was 7.4 per 1,000 patients (p<0.05), and 48% of them had positive bacteriological studies. We noted 61 patients who had preexisting conditions of the knee: 41 with degenerative arthritis, and 20 with rheumatoid arthritis. Forty-eight (67%) patients had received previous intra-articular or periarticular steroid or hyaluronic acid (HA) injections, or acupuncture treatments. The medications that were injected were: steroids (12 cases), HA (10 cases), steroids plus HA (9 cases), and 6 cases were unidentified. The frequency of the injections, regardless of the medication used, was 1 to 5 times in 9 cases, 6 to 10 times in 17 cases, 10 to 15 times in 9 cases, and 16 to 20 times in 2 cases. We identified the medical specialties that were involved in the performance of the intra-articular injections in 29 cases: Orthopaedics (14 cases), Pain Management (5 cases), Rheumatology (3 cases), Rehabilitation Medicine (2 cases), Family Medicine (2 cases), Internal Medicine (1 cases), and others (2 cases). Conclusion: Pyogenic arthritis of the knee may be due frequently to iatrogenic causes, such as intra-articular or peri-articular injections and acupuncture treatments. This has been influenced mainly by changes in the types of injection materials, increased of frequency of injections, frequency and the expansion of injection clinics.

Translaminar Facet Screw Fixation in Lumbar Spine Fusion

Kee-Haeng Lee(이기행),Kee-Yong Ha(하기용),Youn-Soo Kim(김윤수),Young-Seok Ko(고영석) 대한정형외과학회 1998 대한정형외과학회지 Vol.33 No.6

정맥피판에서 Plasmatic Imbibition의 영향을 배제한 새로운 실험모델

고영석,강윤제,김인중,임풍 大韓成形外科學會 1996 Archives of Plastic Surgery Vol.23 No.4

The venous flap is a skin flap in which the nutrient and oxygen are supplied only by the venous pedicle without arterial inflow. It has not yet known how the venous flaps can survive, but it is well known that the plasmatic imbibition is one of the most important contributing factor to the survival of the venous flaps. Many experiments has been being performed to establish the survival mechanism of the venous flaps but the experimental model in which the plasmatic imbibition can be excluded effectively from the venous flap, was not established yet. The purpose of this study was to establish a new experimental model in which the influence of plasmatic imbibition can be excluded effectively from the venous flap, and in addition to this, the effect of arterialization was evaluated in this model. We designed experimental surgery on the auricles of rabbits. The plasmatic imbibition was excluded by the orthotopic autogenous conchal cartilage and strip excision of the surrounding tissue, and the experimental groups were divided as follows: group Ⅰ (simple flow-through venous flap), group Ⅱ (flow through venous flap with plasmatic imbibition blocked), group Ⅲ (arterialized flow-through venous flap), group Ⅳ (arterialized venous flap with plasmatic imbibition blocked). We elevated 17 flaps in each group and compared the survival areas. The results were as follows: In the group Ⅰ and Ⅱ, the mean survival areas of the flaps were 56.53% and 26.21% respectively, and in the group Ⅲ and Ⅳ, 54.70% 25.78% respectively. The mean survival areas were significantly low in the groups where the plasmatic imbibition was blocked whether the flaps were arterialized or not. The arterialized flaps showed no significant increase of survival area compared with that of the non -arterialized flaps. These findings suggest that plasmatic imbibition in the venous flap plays more critical role in increasing the survival area than arterialization.

안면부 손상환자에서 삼차신경 제성감각 유발전위 (Trigeminal Somatosensory Evoked Potential)를 이용한 삼차신경손상의 진단

임 풍,고영석,이석기,한기택 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.6

Trigeminal somatosensory evoked potential is an electrophysiologic diagnostic method for the lesions of trigeminal nerve. In facial traumas such as lacerations, contusions, or fractures etc, the injury of the branches of trigeminal nerve is common. For the evaluation of this injury, however, most surgeons have so far depended on the patient's history and physical examinations, only such as pin-prick test and two-point discrimination test. We performed trigeminal somatosensory evoked potential for the evaluation of the trigeminal nerve in 20 patients whose branches of trigeminal nerves were suspected to be injured by facial trauma. The results were as follows; The trigeminal SSEP showed abnormal findings in 16 out 20 patients. After 2 months, 15 out of 16 patients whose the findings of trigeminal SSEP had been abnormal showed no sensory improvement, but 3 cases of 4 patients with normal SSEP findings improved their symptoms. These results suggest that the trigeminal SSEP is a reliable electrophysiologic method not only for diagnosis but also for predicting prognosis of the injuries of trigeminal nerves.