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박상구(Sang-Goo Park),손기동(Kidong Son),정지환(Ji Hawn Jeong),김윤수(Lyun-Su Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.3
The simulation of refrigeration cycle is important since the experimental approach is costly and time-consuming. The present paper focuses on the simulation of a refrigeration cycle equipped with a capillary tube-suction line heat exchanger(SLHX), which is widely used in small vapor compression refrigeration systems. The present simulation is based on fundamental conservation equations of mass, momentum, and energy. These equations are solved through an iterative process. The non-adiabatic capillary tube model is based on homogeneous two-phase flow model. This model is used to understand the refrigerant flow behavior inside the non-adiabatic capillary tube. The simulation results show that both of the location and length of heat exchange section influence the coefficient of performance (COP).
국내 사이버 대학 이러닝의 학습동기 영향요인에 관한 연구 : ARCS모형을 중심으로
하병환(Ha, Byung-Hawn),구본희(Goo, Bon-Hee),이헌철(Lee, Heon-Cheul) 한국인적자원관리학회 2009 인적자원관리연구 Vol.16 No.S
국내 이러닝 부문의 급속한 성장세를 배경으로 본 연구는 학습자의 학업성과는 학습동기 유발요인-학습동기-학업성과로 진행된다는 Noe(1986)와 Bruner(1997)등의 학습동기이론, Keller(1992)의 학습동기 유발전략 모형(ARCS모형), Keller와 Visser(1990)의 ARCS모형 적용사례 연구, 박수경(1998), 김용래(1993)의 연구 등에 근거, 사이버 대학의 이러닝을 대상으로 이러닝에 내재된 ARCS적 학습동기 유발요인들이 학습동기에 미치는 영향에 대한 실증연구를 진행하였다. 연구의 주요결과를 요약?정리하면 다음과 같다. 첫째, 이러닝의 학습동기 유발요인이 본질동기에 미치는 영향을 분석에서는 집중성, 적절성, 기대감, 주의성 등의 요인들이 유의한 영향변수로 분석되었다. 특히, 집중성과 적절성이 학습의 본질동기에 가장 영향력 있는 변수로 분석되었다. 둘째, 이러닝의 학습동기 유발요인이 수업동기에 미치는 영향분석에서는 기대감, 점검성 등의 요인이 유의한 영향변수로 분석되었다. 연구결과에 근거, 향후 이러닝 학습자들의 학습동기 및 학업성과 제고를 위한 몇가지 실무적 시사점을 제시하면, 이러닝 학습자들에게 수준별 ?목적별 맞춤형 학습기능 및 내용을 제공, 이러닝의 교수자와 학습자간 적극적?적시적 상호작용 강화, 이러닝 내용에 대한 시의 적절한 평가체계 및 피드백 등이 더욱 활성화되어 이루어진다면 이러닝 학습자의 성과와 참여에 긍정적인 영향을 줄 수 있을 것으로 본다. The main object of this study is to inspect the effects of learning motive factors inherent in e-learning classes on e-learners' learning motivation based on ARCS. 152 undergraduates in cyber university participated in this survey and filled out questionnaires related to this study. We conducted the regression analyses of the collected data and found following results. The summary of this test result is as the followings. First, Concentration, Appropriateness, Expectancy, and Attention have a significant effect on the intrinsic motivation of e-learners. Second, Expectancy and Study-Checking have a significant effect on the study motivation of e-learners. The meaningful implication of this study is that to improve e-learners' learning motive, we have to offer learners more customized learning plans, learning contents and curriculum. However, there are lots of limitations in the interpretation and generalization of this study. So, The further study considering more various and detailed variables such as the characteristics of e-learners, contents, and e-learning systems is needed.
강경훈,오국환,윤형구,전광표,정대은,조남길 대한골절학회 1994 대한골절학회지 Vol.7 No.1
In 1814, Monteggia first described a fracture of proximal third of the ulna with dislocation of radial head, and Bado classified and included all fracture of ulna at any level with a dislocation of radial head under the name of Monteggia lesion in 1967. In adults, the prognosis is poor due to many complications such as nerve injury, unreduced radial head, heterotrophic ossification, nonunion and maiunion. The most important factors in achieving good results in adult Monteggia lesions are early acrurate diagnosis, rigid internal fixation of the ulna and complete redurtion of the radial head as soon as possible. The authors reviewed 12 cases of Monteggia fracture in adults who were treated at department of orthopaedic surgery, Sung-Ae General Hospital from 1989 jan. to 1991 Dec, with 17 months mean follow-up. The results obtained were as follows: 1. Male was 10 cases and female 2 cases. 2. The rauses of injury were traffic accident in 9 cases, marhinery injury in 2, fall down in l. 3. Location of ulna fracture was as follows; metaphysis was 4, proximal 1/3 in 6 cases, proximal 1/3 junction in 1, metaphysis and proximal 1/3 in l. 4. According to Bado classification, type I was 58%, type II 25%, type lll 17%, type IV 0%. 5. Treatments of dislorated radial head were closed reduction in 9 cases open reduction in 1 case, and excision in 2 cases. 6. Fractures of ulna were all treated with open reduction an$lt;l internal fixation with plate in 9 cases. IM nailing in 1 case, tension band wiring in 2 cases. 7. Palsy of posterior interosseous nerve was in 2 cases with complete recovery within 6 months. 8. The results (Bruce, et. al) 17 month follow-up in average were 2 excellent, 5 good, 2 fair and 3 poor.
비단열 모세관의 형상 변경에 따른 소형 냉동 사이클 성능 해석
남기원(Ki-Won Nam),이대용(Dae Yong Yi),박상구(Sang-Goo Park),정지환(Ji Hawn Jeong),김윤수(Lyun-Su Kim) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
The present simulation focuses on the effect of the shape of capillary tube-suction line heat exchangers(SLHX), The results in the three cases of the SLHX types show that both of the location and length of heat exchange section influence the coefficient of performance(COP) and cooling capacity. Simulation shows the COP may be improved by 4.6% and the cooling capacity may be improved by 13.6% in the Lateral type.
소아 상완골 과상부 전위골절에 시행한 K강선 경피고정술에 대한 임상적인 고찰
김진일,김동준,오국환,윤형구,전광표 대한골절학회 1991 대한골절학회지 Vol.4 No.1
Supracondylar fracture of the humerus is the most common fracture of the. elbow in children and it is one of the most difficult fractures to manage because of accompanying complications. Of 69 cases of supracondylar fracture of the humerus in children. 41 cases of displaced supracondylar fracture have been treated and managed by percutaneous pinning after closed reduction at Department of Orthopaedic Surgery, Sung Ae Huspital from January, 1988 to December, 1989. The results obtained were as follows; 1. The advantages were stability of fracture, vascular safety, with any permissable position of the elbow, early ambulation and short hospital stay and low incidence of varus deformity in follow up. 2. The complications were median nerve palsy, pin migration and septic arthritis. 3. The results of percutaneous pinnimg were satisfactory in about 92.8%. The stability was satisfactory and there was no defoumity of the elbow. 4. The average duration of periosteal reaction was 18days and bony union was 41days. 5. The final result was associated with initial reduction rather than initial displacement. 6. Follow-up carryig angle was more influenced by postreduction Baumann angle rather than postreduction rotation.