• 한국건설관리학회논문집
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• 제6권1호
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• pp.186-194
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• 2005

본 연구는 건설공사 하도급계약의 당사자인 수급인과 하수급인간의 하도급계약금액 조정과 관련하여 발생하는 원인을 검토하고, 분쟁을 예방하기 위한 하도급대금조정 관련 법규의 개선방안을 제시하는 것을 목적으로 한다. 본 연구는 문헌연구, 하도급계약 법규에 관한 구조와 맥락의 분석 그리고 설문조사의 방법에 의하여 진행되었으며, 주요한 연구결과는 다음과 같다. (1) 발주자와 수급인의 계약금액 조정이 이루어지는 경우 그 내용을 하수급인에게 통지하도록 하는 절차에 관한 조항을 하도급법과 건설표준하도급계약조건에 규정하여야 한다. (2) 하수급인이 하도급계약 내용의 변경 및 그에 수반되는 하도급대금 조정을 청구할 수 있도록 하는 절차를 건설표준하도 급계약조건에 규정하여야 한다. (3) 하도급대금 조정에 관한 기준을 명확히 하기 위하여 건설표준하도급계약조건에서 사용되고 있는 불확정 개념인 단가, 낙찰률 등 용어의 정의를 명확히 하였다. (4) 수급인의 귀책으로 인해 발생하는 연장비용의 부담은 수급인이 부담하도록 하여 부담의 주체를 명확히 하고 연장비용의 산정기준으로 재정 경제부 제정 실비산정규정을 적용하여야 한다.

• Industrial Engineering and Management Systems
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• 제12권3호
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• pp.207-223
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• 2013

Revenue management (RM) has been widely used to model products characterized as perishable. Classical RM model assumed that price is the sole factor in the model. Thus price adjustment becomes a crucial and costly factor in business. In this paper, an optimal pricing model is developed based on minimization of soft customer cost, one kind of price adjustment cost and is solved by Lagrange multiplier method. It is formed by expected discounted revenue/bid price integrating quantity-based RM and pricing-based RM. Quantity-based RM consists of two capacity models, namely, booking limit and overbooking. Booking limit, built by assuming uncertain customer arrival, decides the optimal capacity allocation for two market segments. Overbooking determines the level of accepted order exceeding capacity to anticipate probability of cancellation. Furthermore, pricing-based RM models occupancy/demand rate influenced by internal and competitor price changes. In this paper, a mathematical model based on game theoretic approach is developed for two conditions of deterministic and stochastic demand. Based on the equilibrium point, the best strategy for both hotels can be determined.

• 산업융합연구
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• 제20권12호
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• pp.251-259
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• 2022

최근 평생학습 요구 증가와 간호직의 높은 취업률로 간호학과를 지원하는 만학도의 수가 증가하고 있다. 본 연구는 간호학과 만학도 학생들의 자기효능감, 전공만족도, 대학생활 적응을 확인하고, 대학생활 적응에 영향을 미치는 요인을 파악하기 위해 시도되었다. 연구대상은 30세 이상 간호 대학생 148명으로, 2021년 10월부터 12월까지 자료 수집을 실시하였으며, 수집된 자료는 IBM SPSS 25.0 프로그램을 이용하여 분석하였다. 분석 결과 자기효능감은 3.69±0.51점, 전공 만족도는 4.07±0.50점, 대학생활 적응은 3.42±0.50점으로 나타났다. 간호학과 만학도 학생들의 대학생활 적응에 학년(β=.20, p=.001)과 자기효능감(β=.43, p<.001) 그리고 전공만족도(β=.37, p<.001)가 유의한 영향이 있었으며, 설명력은 54%였다. 간호학과 만학도 학생들은 앞으로 더 증가할 것으로 예측되며, 이상의 연구 결과를 바탕으로 자기효능감과 전공만족도를 높일 수 있는 중재 프로그램을 제공하여 간호학과 만학도 학생들의 대학생활 적응을 향상시킬 것을 제언한다.

• Communications for Statistical Applications and Methods
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• 제16권6호
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• pp.1031-1036
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• 2009

Under recent dramatic declines in response rates, various procedures have been considered among survey practitioners to reduce nonresponse in order to avoid its potential impairment to the inference. In the random digit dialing telephone surveys, substantial efforts are often required to obtain the initial contact for the screener interview. To reduce a burden with higher data collection costs, refusal conversion can be administered only to a random portion of the sample, reducing nonresponse (bias) with an expense of sample variability increment due to the associated weight adjustment. In this paper, we provide ways to determine the optimal subsampling rate using a linear cost model. Our approach for refusal subsampling is to predetermine a random portion from the full sample and to apply refusal conversion efforts if needed only to the subsample.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권2호
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• pp.138-153
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• 2010

The interactions between people who do not know each other have been greatly increased with the on-going increase of people's cyberspace activities. In this situation, there exist potential risk factors such as the possibility of fraud, so we need a method to reduce or eliminate those risk factors. Concerning this necessity, rating systems are widely used, and many trust metrics calculated from rate values that people give to each other are proposed to help them make decisions. However, the trust metrics decrease the accuracy, and this is caused by the different rating scales and ranges of each person. So, we propose a fuzzy adjustment method to solve this problem. It is possible to catch the exact meaning of the trust value that each person selects through applying fuzzy sets, which improve the accuracy of the trust metric calculated from the trust values. We have applied our fuzzy adjustment method to the TidalTrust algorithm, a representative algorithm for calculating the local scalar trust metric, and we performed an experimental evaluation with four data sets and three evaluation methods.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1995년도 학술대회
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• pp.109-112
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• 1995

A rate control strategy in the MPEG is critical to the quality of the reconstructed image sequence. In this paper, were propose a rate control algorithm which can improve the coding performance for a given bit constraint. The proposed algorithm use the distortion-rate curve for the fine adjustment of the quantization scaling factor of each region. This algorithm can also handle the problem due to scene change effectively. It can be easily applicable to existing MPEG coders. Simulation results show that the performance for the algorithm is better than the rate control algorithm in the MPEG-2 TM5.

• 한국농공학회지
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• 제17권1호
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• pp.3627-3641
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• 1975

The Government is trying to increase total food grain yield to meet national self sufficiency by means of increasing unit yield as well as extending crop land, and this year he set the target of 321,000 hectare of forest to clear for cropping. This study was carried to investigate the most efficient method of clearing hillock by bulldozer, and successful method to develope yielding potential of newly cleared land in short term. Since the conventional land clearing method is just earth leveling and root removing neglecting top soil treatment, the growth of crop was poor and farmer tends not to care the land. The top-soil-furrowing method is applied through out this study, that is advantageous especially for the land having shallow top soil and low fertility like Korean forest. In this study, various operating method were tried to find out most efficient method separately in connection with the land slope less than 25 percent and over, and several fertilizing methods to develop yielding potential. The results are as follows; 1) For the natural land slope utilization method, applicable to the land having less than 25 percent slope, reverse operating was more efficient than using forward gear of bulldozer. The operating time was 3 hour 32 minutes and 36 seconds using forward gear was 2 hour 32 minutes and 30 seconds for reverse gear operation per 1,000 square meter. 2) Bulldozer having angle blade adjustment needed 7hr 15min. for constructing of terrace per 10a compaire with the one having angle & tilt adjustment needed 6hr 4min for same operations. Specially there is significant difference for operation time of first period (earth cutting) such as bulldozer having angle blade adjustment needed 3hr 56min compaired with the one having angle & tilt adjustment 3hr 59min. In construction of terrace, the bull-dozer having tilting and angle blade adjustment was most suitable and performed efficiently. 3) For the fertilizer application treatment, the grass (Ladino clover) yield in first year was almost same as ordinary field's in the plot applied(N.P.K+lime+manure) while none fertilizer plot showed one tenth of it, and (N.P.K.+lime) applied plot yielded on third. 4) The effect of different land clearing method to yield showed significant difference between each treatment especially in the first year, and the conventional method was the lowest. In the second year, still conventional terracing plot yielded only half of ordinary field while the other plots showed as same as ordinary field's. 5) The downward top soil treatment plot showed most rapid improvement in soil structure during one year physio chemically, it showed increase in pH rate and organic composition, and the soil changed gradually from loam to sand-loam and the moisture content increased against the pF rate, and it gives good condition to grow hay due to the increase of field water capacity with higher available water content. 6) Since the soil of tested area was granite, the rate of soil errosion was increased about 2 to 5 percent influencing in soil structure more sand reducing clay content, and an optimum contour farming method should be prepared as a counter measure of errosion.

• Journal of Preventive Medicine and Public Health
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• 제34권4호
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• pp.337-346
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• 2001

Objective : To determine the clinical risk factors associated with the mode of delivery decision and to compare cesarean section rates after adjusting for risk factors identified among Korean hospitals. Methods Data were collected from 9 general hospitals in two provincial regions by medical record abstraction during February 2000. A total of 3,467 cases were enrolled and analyzed by stepwise logistic regression. Performance of the risk-adjustment model (discrimination and calibration) was evaluated by the C statistic and the Hosmer-Lemeshow test. Crude rates, predicted rates with 95% confidence intervals, and adjusted rates of cesarean section were calculated and compared among the hospitals. Results : The average crude cesarean section rate was 53.2%, ranging from 39.4% to 65.7%. Several risk factors such as maternal age, previous history of cesarean section, placenta previa, placental abruption, malpresentation, amniotic fluid abnormality, gestational anemia, infant body weight, pregnancy-induced hypertension, and chorioamnionitis were found to have statistically significant effects on the mode of delivery. It was confirmed that information about most of these risk factors was able to be collected through the national health insurance claims database in Korea. Performance of the risk-adjustment model was good (c statistic=0.815, Hosmer-Lemeshow test=0.0621). Risk factor adjustment did lead to some change in the rank of hospital cesarean section rates. The crude rates of three hospitals were beyond 95% confidence intervals of the predicted rates. Conclusions : Considering that cesarean section rates in Korean hospitals are too high, it is apparent that some policy interventions need to be introduced. The concept and methodology of risk adjustment should be used in the process of health policy development to lower the cesarean section rate in Korea.

• 한국건축시공학회지
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• 제13권3호
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• pp.282-290
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• 2013

본 연구는 혼화재의 다량 치환 시 배합 요인의 조정 범위를 검토하기 위한 목적으로 일반 콘크리트에서 혼화재 다량 치환 콘크리트로의 배합변경 데이터를 확보하고자 하였다. 실험결과를 요약하면, 일반 범용적 배합내에서 혼화재 다량 치환 콘크리트로 배합을 변경 시 적정 품질을 확보하기 위한 단위수량의 경우 $20{\sim}30kg/m^3$ 하향 조정, 잔골재율은 W/B 5 % 하향조정 시 약 1 %, 총 치환율 5 % 증가 시약 0.12 %로 중복 하향 조정, AE제는 FA 치환율 5 % 증가 시 컨벤셔널 대비 약 20~30 % 정도 상향 조정, W/B는 FA 및 BS의 치환율이 5 % 상향 시 W/B를 약 1~4 % 정도 하향 조정함으로써 콘크리트의 기본 물성을 확보할 수 있는 것으로 나타났다.

• 한국산학기술학회논문지
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• 제22권4호
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• pp.183-194
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• 2021

본 연구에서는 SGR 모형과 AR 모형으로 부터 개발된 유형별 외래 및 입원 환산지수 분리 모형을 바탕으로 실제 건강보험 진료비 자료를 사용하여 2020년도 환산지수를 추정하였다. 또한 유형별 환산지수 계약 하에서 병원의 단일 환산지수 조정률과 외래 및 입원으로 분리된 복수의 환산지수 조정률을 산출하였다. 마지막으로 환산지수 분리 모형이 의료전달체계를 확립하기 위한 수단의 하나로 효과적으로 사용되기 위한 정책적 방안을 제안하였다. 본 연구의 주요 결론은 다음과 같다. 첫째, r=0.1에서 2020년도 병원의 단일 환산지수 조정률은 2.0%이며 병원의 환산지수를 분리하는 경우 외래 및 입원 환산지수 조정률은 각 각 2.2%, 2.3%로 나타났다. 그리고 조정계수를 활용하여 외래 및 입원 환산지수를 결합하는 방안을 제시하였다. 둘째, 의료전달체계 확립을 위한 조치의 하나로 제안된 가산율 조정 방식 대신에 가산율과 환산지수를 연동하여 운영하는 방안을 제안하였다. 셋째, 병원⦁의원 등 유형별로 외래환산지수, 입원환산지수, 조정계수를 도입하는 것에 추가해 진료량에 대한 목표관리를 가능하게 하는 모형 개발이 필요하다.