• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2004년도 춘계학술발표회
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• pp.799-806
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• 2004

Recently, as the forerunner in establishing the Northeast Asia's logistics base, a lot of marine engineering works such as new ports and container terminals, extension of old ports, new bridges, land reclamation etc. have been progressed. Parallel to it, there is also an increasing demand for improving the safety of construction. In this situation, high resolution seismic reflection profiling can be well used, attempting to classify rocks and sediments under water, if possible, to delineate the distribution of grain sizes in sediments not only for calculating the cost of removing sediments from harbour's channels, but also for estimating the bearing capacities for bridge or port construction. However, the results from the corresponding reflection survey that has been in operation in our country can not be effectively used for engineering purposes mostly due to the insufficient resolution. Thus. in this paper, two innovative strategies are introduced to enhance resolution. The one deals with a newly designed exploration barge that will help reduce several kinds of noises encountered electrically or operationally. The other is associated with an establishment of optimum measuring system comprising e.g. a specially devised hydrophone with a combination of 7 piezoelectric elements. Field experiments performed at Busan harbour are illustrated. The quality of acquired data was thereby fundamentally improved in comparison with that obtained at the same time in a conventional way.

• 품질경영학회지
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• 제34권2호
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• pp.129-135
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• 2006

In the advance of computer technology, it is possible to keep all the related informations for monitoring equipments in control and huge amount of real time manufacturing data in a data base. Thus, the statistical analysis of large data sets with hundreds of thousands observations and hundred of independent variables whose some of values are missing at many observations is needed even though it is a formidable computational task. A tree structured approach to classification is capable of screening important independent variables and their interactions. In a Six Sigma project handling large amount of manufacturing data, one of the goals is to screen vital few variables among trivial many variables. In this paper we have reviewed and summarized CART, C4.5 and CHAID algorithms and proposed a simple method of screening vital few variables by selecting common variables screened by all the three algorithms. Also how to develop a logistics regression model on a large data set is discussed and illustrated through a large finance data set collected by a credit bureau for th purpose of predicting the bankruptcy of the company.

• 경영과학
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• 제34권2호
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• pp.115-123
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• 2017

IS audit has been regarded as contributing to the improvement of the quality of information Systems, recently, it has been argued that it is not possible to expect a effectiveness, because it can offset the schedule burden due to the preparation of additional documents for Audit and it affect to the project schedule. The effectiveness and quality criteria of IS audit are different between groups, because IS audit is responsible for checking the results and process of the developer company. In this study, we modeled between IS effectiveness and auditor competence, audit firm competence, IS audit standards. As a result, it was concluded that auditor competence, audit firm competence, IS audit standards have a positive effect on IS audit effectiveness. However, according to the result of comparing between interest groups, audit firm competence and audit standards were significant in auditor group, but audit standard was significant in requesting organization and developing company thought that auditor was a important factor to audit effectiveness.

• 품질경영학회지
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• 제35권3호
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• pp.107-117
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• 2007

The fatigue has been considered the most failure mode of metal, ceramic, and composite materials. In this paper, numerical experiments to asses the usefulness of two Dixon's methods(small and large samples) and 14 S-N methods on assumptions of lognormal fatigue limit distribution under RFL(Random Fatigue Limit) model are conducted for staircase(or up-and-down) test and compared by MSE(Mean Squared Error) and bias for estimates of mean log-fatigue limit. Also, guidelines for staircase test plans to choose initial stress level and step size are recommended from numerical experiments including sensitivity analyses. In addition, the parametric bootstrap method to construct a confidence interval for the mean of log-fatigue limit by the percentile method using a transition probability matrix of Markov chain is presented and illustrated with an example.

• 품질경영학회지
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• 제41권1호
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• pp.39-52
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• 2013

Purpose: The purpose of this study was to investigate if purchasing companies' efforts of supplier development activities to supplier companies have positive impacts on the purchasing companies' performance as the first step. In the second step, we tried to confirm if the concept of Supply Chain Corporate Social Responsibility activities and Coexistence activities take the roles of moderate variable on relationship between supplier development and three performances respectively. Methods: The collected data through survey were analysed using multiple regression for the first step of the study and moderate regression for the second one of it. Results: The results of this study are as follows; supplier development efforts effect on all three performances positively. Moreover, Supply Chain CSR has significant moderate effect on relationship between supplier management and corporate performances, while Coexistence does between supplier management and logistics performances. In the case of relationship between supplier management and production performances, both Supply Chain CSR and Coexistence show significant moderate effect. Conclusion: Manufacturing companies in Korea need to make effort of supplier development in selective way when they want to practice Supply Chain CSR and Coexistence concurrently considering strategies and objectives.

• 한국항해항만학회지
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• 제27권1호
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• pp.1-8
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• 2003

본 연구는 우리나라 해운 ㆍ항만 분야에 등록된 341개의 규제를 대상으로 보다 바람직한 규제체계의 방향을 설정하는 것이 목적이다. 이를 위해 이 연구에서는 현재 우리나 해운 ㆍ항만분야의 규제 수준이 OECD가 규정한 규제 3단계 가운데 초기수준인 규제 1단께에 있음을 지적하고, 규제의 복잡성등 OECD(1993)가 제시한 제 8조 규제순응 저하요인을 적용한 2단계 조사기준에 따라 우선순위를 선정하였다. 이 결과에 따르면 314개의 등록규제 가운데 규제순응도 조사가 필요한 28개 규제하였으며, 완화 또는 폐지해야할 규제는 9개, 새로운 규제로 바뀌어야 할 규제는 5개인 것으로 밝혀졌다.

• ETRI Journal
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• 제34권3호
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• pp.341-351
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• 2012

We deal with a resource allocation problem for multimedia service discrimination in wireless networks. We assume that a service provider allocates network resources to users who can choose and access one of the discriminated services. To express the rational service selection of users, the utility function of users is devised to reflect both service quality and cost. Regarding the utility function of a service provider, total profit and efficiency of resource usage have been considered. The proposed service discrimination framework is composed of two game models. An outer model is a repeated Stackelberg game between a service provider and a user group, while an inner model is a service selection game among users, which is solved by adopting the Kalai-Smorodinsky bargaining solution. Through simulation experiments, we compare the proposed framework with existing resource allocation methods according to user cost sensitivity. The proposed framework performed better than existing frameworks in terms of total profit and fairness.

• 한국병원경영학회지
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• 제16권1호
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• pp.124-141
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• 2011

The purpose of this study was to analyze of hospital administrator based on the DACUM(Developing A Curriculum) method. The contents of this study were to extract the duties, tasks consisting of job of hospital administrator and to investigate levels of importance, difficulty, frequency and entry level on each task, and to make out a job model of hospital administrator. A DACUM committee was composed to analyze job of hospital administrator and the committee members were total 9, a facilitator, 7 hospital administrator and a recorder. The major findings of this study were as the followings; first, duties in job of hospital administrator were total 13, which were organization of hospital administration affairs, health insurance review & assessment, general affairs, personnel management, hospital planning & management, medical quality improvement, hospital financial affairs, logistics management, facilities management, computerized system management, education & study supports, medical staffs' perceptions of service quality both directly and indirectly through their perceptions of patient orientation. These findings implied that HPWS would be a way of survival in drastically changing hospital environments.

• 한국IT서비스학회지
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• 제18권4호
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• pp.23-38
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• 2019

With the development of information and communication technology, logistics distribution systems and services have been improved, new types of services have been provided, and consumption patterns in consumer markets have also changed. In the domestic distribution market, the development of ICT technology, the spread of smart devices, and the growth of the e-commerce market have led to Omni-channel, a service that integrates offline channels and online channels. Omni-channel service aims to provide consumers with consistent and convenient service by integrating offline and online domain into one. Consumers can get integrated service on and offline. In this study, consumers' intention to use Omni-channel was examined by Self Determination Theory and SERVQUAL. The survey was conducted on Omni-channel user and the research model was composed of 2^nd order factor model considering the characteristics of Omni-channel which provides integrated service based on the prior literature and PLS-SEM (partial least squares structural equation modeling).

• 한국철도학회논문집
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• 제19권4호
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• pp.547-554
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• 2016

본 연구는 궤도 틀림을 관리하기 위한 궤도 품질 지수(TQI)의 진전율 추정에 관한 것이다. 이와 관련한 기존 연구 대부분은 시간에 따른 TQI 값의 선형 회귀분석을 통해 구해진 기울기를 기준으로 상수 진전율을 제시하는 데 그치고 있다. 본 연구는 과거 데이터 혹은 전문가의 식견으로부터 도출되는 파라미터의 사전 분포를 효과적으로 반영할 수 있으며, 파라미터값의 확률 분포를 유도해 낼 수 있는 베이지안 방법론에 기초한 진전율 추정 모델을 제안하고, 기존의 전통적인 회귀분석 모형과의 비교 연구를 통해, 베이지안 방법론의 활용 가능성을 검토해 보았다.