• Structural Engineering and Mechanics
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• 제78권5호
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• pp.573-583
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• 2021

This paper presents a theoretical approach of the structures reinforced with bonded FRP composites, taking into account loading model, shear lag effect and the thermal effect. These composites are used, in particular, for rehabilitation of structures by stopping the propagation of the cracks. They improve rigidity and resistance, and prolong their lifespan. In this paper, an original model is presented to predict and to determine the stresses concentration at the FRP end, with the new theory analysis approach. The model is based on equilibrium and deformations compatibility requirements in and all parts of the strengthened beam, i.e., the concrete beam, the FRP plate and the adhesive layer. The theoretical predictions are compared with other existing solutions. The numerical resolution was finalized by taking into account the physical and geometric properties of materials that may play an important role in reducing the stress values. This solution is general in nature and may be applicable to all kinds of materials.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1479-1485
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• 2008

본 논문은 철도차량분야에 적용할 소프트웨어 Escrow의 상세 적용 절차에 대하여 논의하고자 한다. 철도차량 발주자는 차량의 소프트웨어 포함 장치에 대한 하자보증 기간(warranty period) 이후의 소프트웨어 변경 및 유지보수성 확보를 위하여 소스코드, 핵심적인 기술 원천정보 등을 요구하고 있다. 한편, 소프트웨어 개발 업체는 소스코드 등이 업체의 지적 재산권에 해당하는 사안이기 때문에 시행청의 요구사항을 만족하기 어려운 실정이다. 그러므로, 주 계약자인 철도차량 제작자는 소프트웨어 개발자와 사용자 간의 다른 입장을 조율하기 위하여, 소프트웨어 Escrow 서비스 제도를 도입해야 할 필요성이 있다. 소프트웨어 Escrow는 소프트웨어 Escrow 패키지(소프트웨어 소스코드, 소프트웨어 개발 툴, 빌드 프로세스, 독점권을 가진 정보, 저작권 등)의 거래 시, Escrow 계약 문서에 대한 서명을 통한 Escrow 계약 조건을 상호 합의한 후 신뢰성 있는 제3의 기관에 관련 기술 자료 등을 예치해 두는 양자 간 상생협력을 위한 제도이다. 본 논문에서는 다음의 Escrow 진행 절차에 대한 상세 내역을 연구하고, 향후 프로젝트 적용 방안을 제안하고자 한다.

• 간호행정학회지
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• 제16권3호
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• pp.219-228
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• 2010

Purpose: The purpose of this study was to explore the degree of delay in waiting time, and the relationships of waiting time, patient satisfaction, and revisiting intention of outpatient in general hospitals. Methods: The data were collected from June 22 to July 4, 2009. A total of 536 outpatients who visited 21 clinics of a general hospital were subjected to evaluate the waiting time. The survey tools used were the Korea Health Industry Development Institutes (2008) tool for patient satisfaction and Reichheld & Sasser (1990) for revisiting intention. The data were analyzed by SAS version 9.1, descriptive statistics, t-test, ANOVA, and Pearson correlation coefficient. Results: The mean patient's waiting time was $28.3{\pm}30.7\;min$, the revealed mean score of patient's satisfaction was 2.92, and the revisiting intention showed was 4.56. The waiting time was negatively correlated with patient's satisfaction (r=-.10, p<.019). Patient's satisfaction was positively correlated with revisiting intention (r=-.51, p<.001). Conclusion: Waiting time management is an important factor of increasing patient's satisfaction and revisiting intention in general hospitals. It is mandatory that reservation management systems take into account the patient's characteristics of visiting outpatient department in order to shorten the real waiting time.

• Advances in nano research
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• 제14권6호
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• pp.541-555
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• 2023

The extensive use of polymeric matrix composites in the athletic sector may be attributed to its high strength-to-weight ratio, production economy, and a longer lifespan than conventional materials. This study explored the impact of carbon nanotubes on the properties of different composite field sports equipment components. The test specimens were fabricated using the compression molding technique. The insertion of carbon nanotubes increases mechanical properties related to the process parameters to account for an improvement in the stick sections' overall performance. The dynamic response of functionally graded reinforced nanocomposite wire structure is examined in this paper on the bases of high-order hyperbolic beam theory lined to the size-dependent nonclassical nonlocal theory under the external mechanical load due to the physical activities. Finally, the impact of different parameters on the stability of nanocomposite structures is discussed in detail.

• Journal of Preventive Medicine and Public Health
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• 제24권3호
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• pp.400-413
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• 1991

The purpose of this paper is to identify factors affecting the optimum mix of required inputs and other relevant factors which account for the variation in physician's productivity in general hospitals, and to find out their implications for the efficient health planning and management. An extended version of Cobb-Douglas production function and cross sectional data of one day patient census from all general hospitals in Korea in 1988 were used in the analysis. Main results of the analysis and their implications could be summarized as follows : (1) The production function for physician's inpatient service shows the evidence of economies of scale, but the production function for physician's outpatient and adjusted-patient service, which combines both out- and in-patient service, shows that of dis-economies of scale. (2) The physician's role for production for all service is smaller than auxiliary personnel's, which imply that more intensive utilization of nurses, nursing aides and other auxiliary personnel is desirable for improving general hospital productivity (3) In case of physician's inpatient and adjusted-patient service, nurses' role is greater than nursing aides'. Therefore, more extensive utilization of nurses is recommended for the efficient operation of general hospitals. (4) The factor of hospital beds plays the leading role among required inputs in the production for physician's in- and adjusted-patient service. (5) The physician's productivity of general hospitals in rural area is lower than that in urban area. And the productivity of teaching hospitals is lower than that of the other hospitals. Further analysis was made in physician production function based upon the size of hospitals, namely those hospitals below 250 beds and those above. Explained variances by the factor of hospital beds was significantly increased in the case of those hospitals above 250. A more detailed and thorough investigation is needed for verifying factors influencing physician's productivity in general hospitals in Korea.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1255-1258
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• 1998

Hidden Markov Model (HMM) is the most widely used method in speech recognition. In general, HMM parameters are trained to have maximum likelihood (ML) for training data. This method doesn't take account of discrimination to other words. To complement this problem, this paper proposes a word verification method by re-recognition of the recognized word and its similar word using the discriminative function between two words. The similar word is selected by calculating the probability of other words to each HMM. The recognizer haveing discrimination to each word is realized using the weighting to each state and the weighting is calculated by genetic algorithm.

• Journal of Photoscience
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• 제1권1호
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• pp.75-82
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• 1994

General features of the fluorescence depolarization are briefly reviewed. Molecular rotations and electronic excitation transports are considered to account for the fluorescence depolarization. Various molecular systems studied by the fluorescence depolarization are described. The FiSrster theory which forms a basis for the energy transfer is revisited. Several theoretical treatments for the fluorescence depolarization in liquid and solid phases such as classical hydrodynamics, probability distribution function, Green's function formalism, molecular dynamics simulation and Monte Carlo methods are introduced.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 춘계학술대회 논문집
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• pp.921-926
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• 2004

In this paper, a nonlinear structural damage identification algorithm is derived by taking into account the non-linearity of damage. The structural damage identification analyses are conducted by using the direct method and the Newton-Raphson method. It is found that, the Newton-Raphson method in general provides the better damage identification results when compared with the results obtained by the direct method.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2002년도 ICCAS
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• pp.40.3-40
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• 2002

Unmanned Aerial Vehicle(UAV) needs autonomous flight capability to accomplish various mission objectives. For this objective, the autopilot is a key element in the UAV system design. The principal goal of autopilot is to guide the aircraft under varying external disturbances throughout the mission phases. The external disturbances include gravity effect, wind gust, and other unexpected obstacles. The gust affects the aircraft flight performance to a significant extent. UAV's low speed, light weight, and the absence of human judgment makes un predictable gust more dangerous. Autopilot design in general takes the gust effect into account to satisfy flight performance requirement. In this study..

• Journal of the Korean Data and Information Science Society
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• 제16권4호
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• pp.1079-1086
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• 2005

Most discussions of single imputation methods and the EM algorithm concern point estimation of population quantities with missing values. A second concern is how to get standard errors of the point estimates obtained from the filled-in data by single imputation methods and EM algorithm. Now we focus on how to estimate standard errors with incorporating the additional uncertainty due to nonresponse. There are some approaches to account for the additional uncertainty. The general two possible approaches are considered. One is the jackknife method of resampling methods. The other is multiple imputation(MI). These two approaches are reviewed and compared through simulation studies.