• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 가을 학술발표회 논문집
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• pp.441-448
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• 1999

The load distribution in a ground anchor is very complex because it involves three different materials(soil, grout, and steel), which sometimes act as composite sections (bonded length) or separately (unbounded length). Therefore it is very hard to understand load transfer mechanism on the anchor. In order to understand the load transfer, it is essential to consider the load distribution In the three different materials. On these purposes, full scale anchor test is planned on the geotechnical site at Sunkyunkwan University Prior to the test, modeling and analyses of the load transfer mechanism were performed on the data from the case histories.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2002년도 봄 학술발표회 논문집
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• pp.589-596
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• 2002

In this study, static pile load tests with load transfer measurement were accomplished in the field. Yield pile capacity (or ultimate pile capacity) determined by load-settlement-time relationship was determined and axial load transfer behavior was analyzed. In the test for the four test piles were behaved as end bearing pile but ratios of skin friction to total pile capacity were 27%∼33%.

• Journal of Magnetics
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• 제12권2호
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• pp.72-76
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• 2007

We investigate the spin transfer torque in metallic multilayer system by employing Keldysh non-equilibrium Green function method. We study the dependences of the spin transfer torque on the detailed energy configuration of ferromagnetic, spacer, and lead layers. With Keldysh non-equilibrium Green function method applied to a single band model, we explore spin transfer torque effect in various layer structures and for various material parameters.

• 설비공학논문집
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• 제5권4호
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• pp.257-264
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• 1993

This is the second report of a three part study on the absorption and heat transfer characteristics of absorber, the correlation of refrigerating capacity and heating capacity. The 2nd report deals with the heat transfer characteristics of a vertical falling film type absorber of inner copper tube. The solute is LiBr-Water solution(60wt%) and the solvent is water vapor. The film Reynoles numbers are varied in the range of 35~130. The states of LiBr solution at the top of absorber are supercooled liquid and superheated liquid. The results are summarized as follows ; Heat transfer results reveal that for the absorption of falling film, the state of LiBr solution appears to be influential in determining the heat transfer. Thus, for the state of supercooled liquid, heat transfer coefficient decreases with increasing the film Reynolds number, but in the condition of superheated liquid, it increases conversely. The mass transfer coefficients that were presented in the 1st.report and heat transfer coefficients of this paper are presented as the dimensionless correlation. The optimum water flowrate which brings about maximum value of heat flux in the film exists, and that increases with increasing the cooling water temperature.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제17권1호
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• pp.1-16
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• 2014

본 연구는 유추 거리 및 수학적 지식과 학습의 전이 사이의 관계를 규명하기 위해 수행되었다. 구체적으로 유추적 거리에 따라 구분된 세 가지 전이 문제 해결에서 차이를 보이는지, 그리고 각 전이 문제를 성공적으로 해결하는데 기여하는 수학적 지식은 무엇인지를 분석하였다. 분석 결과 세 가지 종류의 전이 문제 해결에서 통계적으로 유의한 차이를 보였으며 유추 거리가 증가할수록 성공률은 점차적으로 감소하였다. 또한 사실 지식 보다는 개념적 지식이 전이 문제를 해결하는데 긍정적으로 기여하였다. 이상의 결과를 토대로 본 연구는 학습의 전이를 위해 수학 수업은 어떠한 점에 초점을 맞추어야 하는지, 그리고 유추 거리라는 새로운 구인을 찾고 그것이 전이에 미치는 영향을 실증적으로 규명했다는 점에서 의의를 찾을 수 있었다.

• 기술혁신연구
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• 제18권1호
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• pp.21-51
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• 2010

본 연구는 한국 벤처부문의 지식이전 효과를 실증적으로 분석했다. 구체적으로, 지식을 창출하는 단계에서부터 어떤 지식창조기관(주로 대학 출연연구소 기업R&D센터)에서 어떤 유형의 지식이 공급되는지 또한 그 성과는 어떠한지를 규명했다. 종속변수의 유형에 따라 3가지 분석방법인, ‘위계회귀분석’, ‘로지스틱 회귀분석’ 및 ‘생존분석’을 사용했다. 분석 대상은 벤처인증기업 중 1,862개를 분석했으며, 데이터의 원천은 2008년도 STEPI 혁신조사를 비롯해서 정부부처에서 공표되는 객관적 데이터들을 사용했다. 주요 분석결과는 지식원천과 산업유형이 정렬될수록 그 지식이전은 특허를 높이고 성장성을 높였으며, 정부지원은 재무성과에 부정적 영향을 미쳤으나 지식이전에 대한 영향은 없었다. 또한 각 벤처기업의 흡수능력에 따라 지식이전 효과가 차별화되었다. 한국 벤처부문에서 발생하는 정부와 벤처캐피탈 시장의 역할에 대한 이론적 및 실무적 시사점을 토론했다.

• 의료법학
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• 제13권1호
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• pp.249-293
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• 2012

Inter-hospital transfer, depending on its medical and legal appropriateness, affect the prognosis of patients and can even lead to legal disputes. As Emergency Medical Service Act, any physician shall, in case where deemed that pertinent medical service is unavailable for such patient with the capacities of the relevant medical institution, transfer without delay such patient to another medical institution where a pertinent medical service is available. For medico-legally appropriate inter-hospital transfer, the head of a medical institution shall, in case where he transfers an emergency patient provide medical instruments and manpower required for a safe transfer of the emergency patient, and furnish the medical records necessary for a medical examination at the medical institution in receipt of such patient. And transfer process must comply with the requirements prescribed by executive rule such as attachment of the referral, provision of ambulance, fellow riders and informed consent of transfer. Those engaged in emergency medical service shall explain an emergency medical service to an emergency patient and secure his consent. In addition to the duty to inform about emergency medical service to the patient and his or her legally representative, there is also a duty for doctors to sufficiently explain to the patient and his or her legally representative during inter-hospital transfer that the need for the transfer, the medical conditions of the patient to be transferred and emergency treatment that will be provided by the hospital from which the patient is going to transferred. Likewise, the hospital to which the patient is transferred must be thoroughly informed about matters such as the patient's conditions, the treatment the patient was given and reasons for transfer by transferring doctors.

• 대한기계학회논문집B
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• 제24권11호
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• pp.1470-1477
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• 2000

Due to the ozone depletion and global warming potentials, some refrigerants(CFx and HCFCs) have been rapidly substituted. R410A is considered as the alternative refrigerant of R22 for the air-conditioners used a home and in industry. Experiments on the condensation heat transfer characteristics inside a smooth or a micro-fin tube with R410A are performed in this study. The test tubes 7/9.52 mm in outer diameters and 3 m in length are used. Varying the mass flux of the refrigerant and the condensation temperatures, the average heat transfer coefficients and pressure drop are investigated. It is shown that the heat transfer is enhanced and the amount of pressure drops are larger in the microfin tube than the smooth tube. From the heat transfer enhancement coefficient and the pressure penalty factor, it is found that the high heat transfer enhancement coefficients are obtained in the range of small mass flux while the penalty factors are almost equal.

• 대한기계학회논문집B
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• 제24권4호
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• pp.570-577
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• 2000

Local heat transfer characteristics inside a hard disk driver(HDD) are investigated in this study. The investigation is considered between disks co-rotating in a cylindrical enclosure. The gap spacing, rotating speed and head-arm positions are mainly considered to understand the flow and heat transfer in the co-rotating disks. The naphthalene sublimation technique is used to determine local heat/mass transfer coefficients on the rotating disk. Flow patterns inside the co-rotating disks are investigated using a Laser Doppler Anemometer (LDA) and also analyzed numerically. The results show that the heat transfer coefficients on the disk changed little with the gap spacing between disks. Heat transfer rates in the outer region increases with increasing rotating Renolds number, but the values normalized by that on a free rotating disk give a similar pattern for the tested cases. The head-arm inserted between the rotating disks destroys the inner region resulting in enhancement of heat transfer in that region.

• Smart Structures and Systems
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• 제17권4호
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• pp.577-591
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• 2016

In this study, the transfer length of 2400 MPa, seven-wire high-strength steel strands with a 15.2 mm diameter in pretensioned prestressed concrete (PSC) beams utilizing high strength concrete over 58 MPa at prestress release was evaluated experimentally. 32 specimens, which have the variables of concrete compressive strength, concrete cover depth, and the number of PS strands, were fabricated and corresponding transfer lengths were measured. The strands were released gradually by slowly reducing the pressure in the hydraulic stressing rams. The measured results of transfer length showed that the transfer length decreased as the concrete compressive strength and concrete cover depth increased. The number of strands had a very small effect, and the effect varied with both the concrete cover depth and concrete strength. The results were compared to current design codes and transfer lengths predicted by other researchers. The comparison results showed that the current transfer length prediction models in design codes may be conservatively used for 2400 MPa high-strength strands in high-strength concrete beams exceeding 58 MPa at prestress release.