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      • KCI등재

        의학교육에의 교육순환모델(Learning Cycle)의 적용과 쟁점

        김보현,김상현,Kim, Bo-Hyun,Kim, Sang-Hyun 연세대학교 의과대학 2008 의학교육논단 Vol.10 No.2

        Purpose: The 'learning cycle' proposed by Guilbert in 1981 has been accredited as an effective and useful model for curriculum design. Three components of learning cycle, learning objective, instructional method, and assessment are connected organically and form basic structure of curriculum. In this study, we intend to analyze how the learning cycle and its three components are applied to present medical curriculum and examine the points at issue of the learning cycle in medical education. Also, we try to identify the educational significance of the leaning cycle in medical education. Results: First, concerning the learning objective, it was identified that impractical and abstract expressions are major controversial points. Also, there is a need to make learning objectives covering entire medical curriculum. Second, because of various structural problems, it is hard to practice new and various instructional methods. Third, even though there is a growing need for medical curriculum to develop and utilize more various and detailed assessment and evaluation, it was revealed that only are standardized and traditional assessments mainly used. Conclusion: Synthetically, we have some suggestions as follows. First, it is necessary to specify and actualize the learning objectives. Also, instructional methods and assessments should be diversified. And finally, there is a need to build organic and delicate medical curriculum by applying the learning cycle to medical education more actively.

      • KCI등재

        플라즈마 산화방법을 이용한 질소가 첨가된 실리콘 산화막의 제조와 산화막 내의 질소가 박막트랜지스터의 특성에 미치는 영향

        김보현,이승렬,안경민,강승모,양용호,안병태,Kim, Bo-Hyun,Lee, Seung-Ryul,Ahn, Kyung-Min,Kang, Seung-Mo,Yang, Yong-Ho,Ahn, Byung-Tae 한국재료학회 2009 한국재료학회지 Vol.19 No.1

        Silicon dioxide as gate dielectrics was grown at $400^{\circ}C$ on a polycrystalline Si substrate by inductively coupled plasma oxidation using a mixture of $O_2$ and $N_2O$ to improve the performance of polycrystalline Si thin film transistors. In conventional high-temperature $N_2O$ annealing, nitrogen can be supplied to the $Si/SiO_2$ interface because a NO molecule can diffuse through the oxide. However, it was found that nitrogen cannot be supplied to the Si/$SiO_2$ interface by plasma oxidation as the $N_2O$ molecule is broken in the plasma and because a dense Si-N bond is formed at the $SiO_2$ surface, preventing further diffusion of nitrogen into the oxide. Nitrogen was added to the $Si/SiO_2$ interface by the plasma oxidation of mixtures of $O_2/N_2O$ gas, leading to an enhancement of the field effect mobility of polycrystalline Si TFTs due to the reduction in the number of trap densities at the interface and at the Si grain boundaries due to nitrogen passivation.

      • 반월상연골 파열에 대한 관절경적 inside to out 봉합술의 결과

        김보현,황인성,윤태봉,변재용,Kim, Bo-Hyun,Hwang, In-Sung,Yun, Tae-Bong,Byun, Jae-Yong 대한관절경학회 2004 대한관절경학회지 Vol.8 No.1

        목적: 반월상 연골 파열에 대한 비흡수성 봉합사를 이용한 관절경적 inside to out봉합술후 임상적 치유와 환자의 만족도를 결과에 영향을 주는 인자에 따라 분석하였다. 대상 및 방법: 1999년 8월부터 2002년 6월까지 반월상 연골 파열에 대한 관절경적 Inside to out 봉합술을 비흡수성 봉합사를 이용하여 시행 후 12개월이상 추시가 가능하였던 95명 110례를 대상으로 하였다. 결과는 임상적 치유와 주관적 만족도로 평가 하였으며 이들 결과에 대한 나이, 수상 후 수술까지의 기간, 파열의 부위, 파열 길이, 파열의 종류, 관절 연골의 손상 정도, 동반된 전방 십자인대 수술이 미치는 영향을 분석하였다. 결과: 임상적 치유는 84례(76%)이었으며, 환자의 주관적 만족도는 98례(89%)이었다. 전방십자인대 파열을 동반한 경우에, 파열 길이가 2cm이하인 경우가 2cm이상인 경우보다. 관절 연골의 퇴행성 정도가 심하지 않은 경우가 심한 경우보다 임상적 치유율과 환자의 만족도가 유의하게 높았다. 내측 반월상 연골 파열의 경우에, 수상후 수술까지의 기간이 짧을수록, 파열의 종류가 종 파열인 경우 임상적 치유율이 높았다. 복잡 또는 퇴행성 파열의 경우 낮은 임상적 치유율에 비해 환자의 만족도는 높았다. 결론: 비흡수성 봉합사를 이용한 관절경적 반월상 연골 Inside to out 봉합술은 다양한 봉합이 가능하고 사용이 쉬운 술식이다. 반월상 연골의 봉합 여부 결정에 있어 환자의 연령은 절대적인 고려 대상이 아니며, 퇴행성 또는 복잡파열, 관절연골의 손상이 동반된 파열의 경우 환자선택과 수술에 신중을 기해야 할 것으로 사료 된다.증을 줄일수 있으며, PASTA 병변을 포함해서 후상방 파열과 동반되지 않은 견갑하건의 부분 파열은 매우 적합한 관절경하복원술의 적응증이 될 수 있다고 사료된다. Purpose: This study examined clinical cure and patients' satisfaction degrees by factors influencing surgical operation results, after arthroscopic inside to out repair as a nonabsorbable suture material, in case of meniscal rupture. Materials and Methods: Materials were 110 cases of 95 patients who could make paces for over 12 months from August 1999 to June 2002. Results were evaluated by clinical cure and subjective satisfaction degrees. This study, concerning those results, analyzed age, term from taking pictures to taking surgical operation, rupture section, rupture length, rupture types, lesion of articular-cartilage, and effects of anterior cruciate ligament operation accompanied. Results: 84 cases(76%) were clinically cured, 98 cases(89%) were subjectively satisfied. In case of accompanying anterior cruciate ligament rupture, and in case that rupture length was below 2 cm, rates of clinical cure and patients subjective satisfaction were significantly high. In case of complex or degenerative rupture, patients satisfaction rates were higher when comparing with clinical cure rates. Conclusion: Various sutures are possible as well as available in case of arthroscopic meniscal inside to out repair using nonabsorbable suture material. It can be concluded that patients age is not absolte consideration in determining the suture of meniscus. In cases of complex rupture, degenerative rupture, ruptures companied by joint-cartilage injuries, considerate consideratin need be paid to choose patients and operations.

      • KCI등재후보

        신경 및 위장관 증세를 동반한 Erythropoietic Protoporphyria 환아 1예

        김보현,박영년,정기섭,Kim, Bo Hyun,Park, Young Nyun,Chung, Ki Sup 대한소아소화기영양학회 2005 Pediatric gastroenterology, hepatology & nutrition Vol.8 No.2

        본 저자들은 심한 간 부전과 함께 복통, 구토, 의식 변화, 사지 마비, 배뇨 장애 및 호흡부전을 동반한 EPP 예를 경험하였기에 보고하는 바이다. Erythropoietic protoporphyria is a genetic disorder due to a deficiency of ferrochelatase resulting in excessive accumulation and excretion of protoporphyrin. The predominant clinical feature is photosensitivity. Severe hepatic failure occurs in a small percentage of patients, and neurological symptoms are very rare. We report a case of erythropoietic protoporphyria associated with severe hepatic dysfunction and neurological symptoms. A 9-year-old girl presented with severe abdominal pain, nausea, weakness and pain of extremities, and urinary retention. Ultrasonogram and abdominal CT scanning revealed a diffuse infiltrated and enlarged liver. Liver biopsy showed deposition of dense dark brown pigment within the bile, hepatocytes and Kupffer cells. Plus, dense dark brown deposits gave a red birefringent under polarize light. Porphyrin studies demonstrated markedly elevated serum free erythrocyte protoporphyrin. This girl was diagnosed as erythropoietic protoporphyria with severe liver dysfunction and neurological symptoms.

      • KCI등재

        CO<sub>2</sub>냉매용 제어밸브의 응답 특성

        김보현,장지성,Kim, Bo Hyun,Jang, Ji Seong 유공압건설기계학회 2018 드라이브·컨트롤 Vol.15 No.4

        Pilot operated control valve for $CO_2$ refrigerant is a valve that can perform various functions according to the user's intention by replacing pilot units, widely used for flow rate, pressure, and temperature control of refrigeration and air conditioning systems. In addition, $CO_2$ refrigerant, that requires high pressure and low critical temperature, can be installed and used in all positions of the refrigeration system, regardless of high or low pressure. In this paper, response characteristics are modeled and analyzed based on behavior of the main piston of the pilot-operated control valve. Although various factors influence operation of the main piston, this paper analyzes the effect of equilibrium pressure depending on valve installation position and application, and inlet and outlet orifice size of the load pressure feedback chamber to determine feedback characteristics of the main piston. As a result, it was possible to quantitatively analyze the effect of change in equilibrium and load pressure feedback chamber flow path size on the change in main piston dynamic and static characteristics.

      • KCI등재
      • KCI등재
      • KCI등재

        무등산도립공원 시간대별 탐방객 이동패턴에 따른 관리방안 연구

        김보현 ( Bo Hyun Kim ),오구귤 ( Koo Kyoon Oh ) 한국환경생태학회 2012 한국환경생태학회지 Vol.26 No.6

        무등산도립공원 주요 거점의 시간대별 탐방객 이동패턴을 파악하여 관리방안을 제안하기 위해 증심사지구, 원효사지구, 중머리재 등 주요 지점에서 계절별로 3일씩, 오전 7시부터 오후 7시까지 출입하는 탐방객 수를 조사하였다. 조사결과 무등산도립공원 주요 출입구인 증심사지구와 원효사지구에서는 대부분 오전 9시부터 오후 2시 사이에 입장하였고, 오전 10시에서 11시 사이에 입장객 수가 가장 많았다. 퇴장시간은 대부분 오전 12시부터 오후 5시 사이였으며, 피크시간은 오후 2시부터 4시 사이었다. 중머리재를 방문하는 탐방객들은 대부분 오전 11시에서 오후 3시 사이에 중머리재를 경유하여 장불재나 중봉방향으로 등산하거나 증심사지구나 원효사지구로 하산하였는데 오전 11시부터 오후 1시까지가 피크시간 이였다. 한편, 요일과 계절에 따른 시간대별 이동 패턴에는 뚜렷한 경향이 나타나지 않았다. 공원자원 보전과 탐방만족도 증진을 위해서 탐방객이 집중되는 장소와 시간을 중심으로 탐방안내, 캠페인, 훼손지복원 등 집중관리가 필요하다. This study aims to understand the time-based moving pattern and suggest management strategies through surveying the number of visitors from 7 a.m. to 7 p.m. for 3 days of each season in 3 key sites (Jeungsimsa district, Wonhyosa district and Jungmeorijae) of Mudeungsan Provincial Park. Majority of visitors who entered through Jeungsimsa district and Wonhyosa district visited the Mudeungsan provincial park from 9 a.m. to 2 p.m., and the number of enterers reached the peak from 10 to 11 in the morning. Majority of the visitors left the Mudeungsan provincial park from noon to 5 p.m.. The number of leavers showed the peak between 2 and 4 in the afternoon. Most of visitors who moved via Jungmeorijae from 11 a.m. to 3 p.m. climbed toward Jangbuljae or Jungbong or came down to Jeungsimsa district or Wonhyosa district. The number of enterers hit the highest from 11 a.m. to 1p.m, However, there was no stark difference in the time-based moving pattern of each season and days of week, The special intensive management such as providing visitor service, conducting a campaign and restoring the damaged land in concentrated site and time is needed for conserving natural resources and improving visitors satisfaction.

      • KCI등재
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