• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
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• pp.1781-1784
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• 2007

The increase of repetition rate, the dithering of laser optics, and the extension of pulse duration time are major approaches in improving the picture quality of AMOLEDs fabricated by excimer laser crystallization (ELC). Advanced solid phase crystallization (ASPC) has been developed to improve the uniformity and the process cost. Even though the mobility of ASPC-TFT is lower than that of ELC-TFT, it is high enough to drive AMOLED pixels.

• 간호행정학회지
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• 제18권4호
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• pp.414-423
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• 2012

Purpose: The purpose of this study was to investigate the impact of the unit-level nurse practice environment on nurse turnover intention in the small and medium sized hospitals. Methods: A cross-sectional study was conducted using a questionnaire survey with 308 nurses in 38 nursing units of 6 small and medium sized hospitals, having over 200 beds and under 300 beds and located in B metropolitan city. Data were collected from July 20 to August 10, 2011. Data were analyzed using hierarchical multiple regression. Results: The mean turnover intention in nurses of small and medium sized hospitals was $3.52{\pm}0.53$. Factors affecting turnover intention in the nurses included age, work unit, monthly income, number of night-duties, work hours per day and unit-level nurse practice environment. The unit-level nurse practice environment accounted for 15% of turnover intention when other variables were controlled. Conclusion: The results of the study indicate that nurse turnover intention is associated with the nurse practice environment at the unit level. Small and medium sized hospitals can improve nurse retention and lower turnover intention by changing the nurse practice environment of unit, such as creating better support services and nurse participation in hospital affairs.

• 한국수자원학회논문집
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• 제43권7호
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• pp.635-643
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• 2010

작은 규모 유역의 홍수 유출량을 산출하기 위해서 유역을 대표하는 하나의 단위유량도를 많이 적용해 왔다. 이 때 단위유량도의 첨두유량과 첨두 발생시간은 단위유량도를 결정하는 특성치로 취급된다. 본 연구에서는 국내에서 $8.5\;km^2$ 정도의 소규모 유역에서도 강우 사상별로 단위유량도의 첨두유량과 발생시간은 상당히 변동되는 것을 보이고 분석하였다. 그리고 동일 소유역에서 단위유량도 변동의 주요인으로 강우 사상별 평균 강우강도라고 보고 강우 사상별 강우강도와 단위유량도의 첨두유량 및 발생시간의 관계를 각각 지수함수식으로 제시하였다. 결과적으로 사용 자료상의 제약 등으로 단위유량도 첨두치에상당한 분산을 동반하는 한계는있지만 연구된 대로 단위유량도의첨두유량 및 첨두 발생시간과 강우의 평균적인 회귀 관계는 단위유량도 이론의 보완적 측면에서 수문학적 가치를 갖는다.

• 물과 미래
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• 제19권2호
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• pp.157-166
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• 1986

미측측 소하천 유역에 적용할만한 합성단위도를 찾아내기 위하여 대표유역의 관측자료로부터 각 소하천의 실측단위도를 유도하였다. 소하천 유역의 특성인자와 단위도의 특성치를 분석하여 Snyder, S.C.S, Nash, Clark에서 이용되는 식을 유도하였다. 이들 식을 이용하여 대표유역의 유역특성치로서 각 방법에 의한 합성단위도를 유도하고 이들 합성단위도와 실측단위도를 비교 분석한 결과 다음과 같은 특성을 발견하였다. Snyder 방법에 의한 첨두유량과 근사하였으나 첨두유량의 25,50,75%되는 단위도의 좌표만으로는 단위도의 형을 결정하기엔 미흡함이 남아있다. Clark 방법에 의하여 합성단위도를 정확하게 유도하기 위하여 그 유역의 시간-면적도의 기저장과 등유달시간면적을 정확하게 구할 수 있는 방법이 모색되어야 한다고 생각한다. Nash 방법에 의한 합성단위도의 첨두유량과 기저시간은 저장상수와 Gamma 함수인자만의 함수이기 때문에 정확한 저장상수와 Gamma 함수인자의 결정이 선행되어야만 신빙성있고 정도가 높은 단위도 유도가 가능하리라 판단된다. S.C.S 방법에서 첨두유량은 유역면적에 비례하고 첨두유량 발성시간에 반비례하기 때문에 첨두유량 발생이 빠른 소유역에서는 다소 큰 첨두유량 값을 갖음을 알았다.

• 한국농공학회논문집
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• 제53권2호
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• pp.53-60
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• 2011

This study was conducted to investigate the effect of hydropower factors (watershed, gross head), operation ratio and unit electricity cost on the benefit-cost ratio (B/C ratio) of small hydropower using agricultural reservoirs. The equation of B/C ratio was expressed as a function of watershed area, gross head, operation ratio and unit electricity cost. The benefit increased with watershed area, gross head and unit electricity cost, while the cost increased with watershed area and gross head but decreased with operation ratio. The B/C ratio increased with watershed area, gross head, operation ratio and unit electricity cost. While the effect of gross head on the B/C ratio decreased with watershed area, the effect of operation ratio and unit electricity cost on the B/C ratio increased with watershed area. The operation ratio is an important factor to affect the B/C ratio and therefore we need to develop hydropower for the heightened dams to expect high operation ratio due to continuous water release. The unit electricity cost is also an important factor to affect the B/C ratio and the B/C ratio was always below 1 unless unit electricity cost is over 60 Won/kWh under given conditions. The reservoirs with economic feasibility for small hydropower development were three in 21 when the equation of B/C ratio was appled to the study reservoirs. The results can be used to choose the appropriate reservoir with economic feasibility for development of small hydropower.

• 한국정밀공학회지
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• 제17권2호
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• pp.201-210
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• 2000

The large deflection of plate is analyzed by co-rotational formulations using small local displacements and rotating unit vectors on the nodal points. The rotational degrees of the freedom are represent ed by the unit vectors1 In the nodal points, and the equilibrium equations are formulated by using small deflection theories of the plates by assuming that the directions of the unit vectors of the nodal points are known apriori. The translational degrees of freedom are independently solved from the rotational degrees of freedom in the equilibrium equations, and the correct directions of the unit vectors are computed by the iterative scheme by imposing the moment equilibrium constraint. The equilibrium equations and the associated solution procedure are explained, and the verification problems are solved.

• 한국실내디자인학회논문집
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• 제16권4호
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• pp.54-61
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• 2007

The purpose of this study was to investigate the spatial characteristics of residential and nursing units in large skilled nursing facilities for the elderly that were located in city areas, and to discuss the way for efficient unit care. For collecting the data, the researcher visited 6 facilities to make explorations and to interview the staff concerned. Most of the research facilities had systematic residential units that each unit basically had elderly private rooms and the spaces for small group. The number of elderly residents per unit was appropriate for the limit which was suggested by Kwon(2002), but the sizes of small group spaces were smaller than the standard limit($1.62m^{2}$ per resident). The nursing units were made up of nursing station, 2-4 residential units, spaces for large group of residents, hair dressing, nurse, living assistants, bathing, storage and etc. Some of them had problem in efficiency of space use because they did not have distinct usage. In conclusion, this study suggests that each floor has one nursing unit including 40 residents maximum and each nursing unit consists of 2-3 residential units that have 20 residents maximum per unit. In each residential unit, the furniture and spaces for efficient unit-care should be arranged, such as TV, dining table, kitchenette, bathroom, and rooms for living assistants. The hall type is better for the small group so that it has a transitional characteristic leading to the public spaces. The large group space needs to have clear usage such as conducting program differentiated from small group, and various furniture such as sofa, TV, table, and etc which encourage the elderly voluntary use.

• 한국농공학회지
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• 제23권3호
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• pp.78-87
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• 1981

This study was attempted to get dimensionless unit hydrograph by linear model which can be used to the estimation of flood for the development of Agricultural water resources and laid emphasis on the application of dimensionless unit hydrographs for the ungaged watersheds by applying linear model. The results summarized through this study are as follows. 1.Peak discharge is found to be Qp= CAR (C =0. 895A-o.145) having high significance between peak discharge, Qp and effective rainfall, R within the range of small watershed area, 84 to 470km2. consequently, linearity was acknowledged between rainfall and runoff. Reasonability is confirmed for the derivation of dimensionless unit hydrograph by linear model. 2.Through mathematical analysis, formula for the derivation of dimensionless unit hydrograph was derived. qp--p=(tp--t)n-1[e-(n-1)](tp--t-1) 3.Moment method was used for the evaluation of storage constant, K and shape parameter, n for the derivation of dimensionless unit hydrograph. Storage constant, K is more closely related with the such watershed characteristics as length of main stream and slopes. On the other hand, the shape parameter, n was derived with such watershed characteristics as watershed area, river length, centroid distance of the basin and slopes. 4.Time to peak discharge, Tp could be expressed as Tp=1. 25 (√s/L)0.76 having a high significance. 5.Dimensionless unit hydrographs by linear model stood more closely to the observe dimensionless unit hydrographs On the contrary, dimensionless unit hydrographs by S.C. S. method has much difference in comparison with linear model at the falling limb of hydrographs. 6.Relative errors in the q/qp at the point of 0.8 and 1.2 for the dimensionles ratio by linear model and S. C. S. method showed to be 2.41, 1.57 and 4.0, 3.19 percent respectively to the q/qp of observed dimensionless unit hydrographs. 7.Derivation of dimensionless unit hydrograph by linear model can be accomplished by linking the two empirical formulars for storage constant, K, and shape parameter, n with derivation formular for dimensionless unit hydrograph for the ungaged small watersheds.

• 대한토목학회논문집
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• 제34권1호
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• pp.293-303
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• 2014

현재 실적공사비 단가는 한국건설기술연구원에 의해 발표되고 있으며, 대규모 공사에서 수집된 공사비 자료를 분석하여 작성되고 있다. 따라서 소규모 공사의 경우 현행 실적공사비 단가를 적용함에 있어 불합리한 문제점이 발생하고 있다. 이러한 문제점을 분석하기 위해, 본 연구에서는 대 소규모 토목, 건축, 기계설비공사에 대한 실적공사비를 상호 비교하였다. 그 결과, 소규모 공사의 실적공사비는 대규모 공사에 비해 평균적으로 26.6%가 높음을 확인할 수 있었다. 한편, 노무비에 의한 대 소규모 공사의 실적공사비 차이는 18.4%이고, 재료비 경비에 의한 차이는 8.18%인 것으로 분석되었다. 또한 본 연구에서는 이를 시정하기 위한 소규모 공사의 실적공사비 보정방안을 제안하였다.

• 품질경영학회지
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• 제42권4호
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• pp.591-606
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• 2014

Purpose: The purpose of this study is to design an experimental simulation model for evaluating the UGV(Unmanned Ground Vehicle) effectiveness in a small unit combat scenario. Methods: We design and build a simulation model to evaluate the combat effectiveness of UGV in a small unit combat scenario. In order to build a simulation model, we used AnyLogic software tool which has functional advantages to describe agent-based simulation model. As for the combat scenario, we applied the typical engagement of mechanized unit equal or lower than battalion level. Analysis process follows the three phases. 1) Design an agent based conceptual medel in a small unit combat scenario. 2) Build a simulation medel using AnyLogic tool. 3) Analyze the simulation results and evaluate the UGV effectiveness. Results: The UGV effectiveness was measured and presented as a numeric values. Those numeric values were represented as a MOE(Measure of Effectiveness) which was the blue survival ratio. Conclusion: We developed an agent based simulation model which can provide a pattern of change how UGV effectiveness varied depending upon the number of UGV in a small unit combat scenario. We also found that the UGV effectiveness grows in the given scenario as the number of UGV increases.