• 수산해양교육연구
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• 제10권1호
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• pp.1-14
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• 1998

Transportation provides an infrastructure vital to economic growth, and it is also an integral part of production. As a port is regarded as the interface between the maritime transport and domestic transport sectors, it certainly play a key role in any economic development. Ship's delay caused by port congestion has recently has recently attracted attended with the analysis of overall operation in port. In order to analyse complicated port operation which contains large number of variable factors, queueing theory is needed to be adopted, which is applicable to a large scale transportation system in chiding ship's delay in Inchon port in relation to ship's delay problem. The overall findings are as follows ; 1. The stucture of queueing model in this port can be represented as a complex of multi-channel single-phase 2. Ship's arrival and service pattern were Poisson Input Erlangian Service. 3. The suitable formula to calculate the mean delay in this port, namely, $W_q={\frac{{\rho}}{{\lambda}(1-{\rho})}}{\frac{e{\small{N}}({\rho}{\cdot}N)}{D_{N-1}({\rho}{\cdot}N)}}$ Where, ${\lambda}$ : mean arrival rate ${\mu}$ : mean servicing rate N : number of servicing channel ${\rho}$ : utilization rate (l/Nm) $e{\small{N}}$ : the Poisson function $D_{(n-1)}$ : a function of the cumulative Poisson function 4. The utility rate is 95.0 percents in general piers, 75.39 percents in container piers, and watiting time 28.43 hours in general piers, 13.67 hours in container piers, and the length of queue is 6.17 ships in general piers, 0.93 ships in container piers, and the ship turnaround time is 107.03 hours in general piers, 51.93 hours in container piers.

• 농촌계획
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• 제12권2호
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• pp.87-96
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• 2006

The purpose of this study is to increase the utility in terms of the elderly's welfare. The data introduced in this paper were collected by the constructed interview method, and 192 aged interviewees were selected from 4 rural areas: Namhaegun, Uiryeong-gun Imsil-gun and Sunchang-gun. From the descriptive analysis of the data, the results derived are as follows: 1) The financial supports are needed to remodel rural village community facilities as senior centers. 2) It is expected that the facility be a center for the aged people's living in a village, and that have multiple functions of general care service network health care, meal support and making friendship spaces for them. 3) Share housing function is also added to the facility in emergency conditions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 A
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• pp.79-82
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• 2002

The addition of switches to a distribution feeder does, in general, increase reliability by decreasing the duration of the outage of many to the customers on the feeder. To cover its service area so that feeder-level delivery reaches sufficiently close to all customers, feeders typically split their routes many times, in what is often called a lateral feeder. It is interesting to note, however, that the effectiveness of a switch is very much dependent on the types of lateral feeder. The types of lateral are classified into two types. The first is loop lateral feeder that can connect its load to an adjacent feeder through a tie line in case that a fault occurs in its feeder and it is laid out so that every feeder has complete fault backup through re-switching of its loads to other sources like a main feeder. The second is the radial lateral feeder cannot connect its load to an adjacent line, no provision is made for contingency backup of feeders. There are no other circuits in the radial lateral feeder form which to restore power. In this study, we evaluate the effectiveness of a switch installation between on the radial and loop lateral feeders to increase reliability by decreasing the duration of the outage. These results can help power utility to design the switch layouts on the radial and loop lateral feeder system.

• 농촌지도와개발
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• 제4권1호
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• pp.201-209
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• 1997

The objective of this study were 1) to review concepts of user information satisfaction (UIS), 2) to analyze tools for measuring user information satisfaction, 3) to identify factors affecting information satisfaction. The study was carried out by the analysis of literatures related to information system. The construct of UIS has been operationalized in many different ways. Several studies employed single-item rating scales; such scales have been criticized as unreliable. Single-item scales also provide little information as to what the user finds dissatisfying(satisfying) and are thus of limited utility outside a research setting. Multiple-item UIS measures have become increasingly common. Generally, they are of two types. The first focuses on the information system product. With such diverse names as "system acceptance", "output quality", and "appreciation", these scales focus on the content of the information system and the manner in which the information is presented. The second type of multiple-item scale includes the organizational support for developing and maintaining the system as well as the system product itself. This type of instrument contains items concerned with training, documentation, development procedures, systems maintenance, etc., as well as items related to system content. Thus it provides an indicator of the overall quality of information services provided by an information service function. Generally, UIS measures have not been carefully validated. Recently, however, several rigorous attempts have been made to develop valid and reliable UIS measure.

• 한국철도학회논문집
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• 제14권3호
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• pp.276-284
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• 2011

본 연구는 철도 네트워크에서의 통행배정 모형에 관한 것이다. 기존의 통행배정모형은 주로 도로 혹은 도시 대중교통 네트워크에 초점을 둔 연구로서, 최적전략 기반 통행배정 모형을 비롯한 대부분의 통행배정 모형 이 지역간 철도 네트워크에 대해서는 비현실적인 수요를 생성한다고 알려져 있다. 특히 KTX개통 이후, KTX가 포함된 환승경로를 이용하는 승객이 점차 증가하는 추세이며, 이러한 KTX가 포함된 환승 경로 및 스케줄이 지속적으로 개선되고 있다. 본 연구는 환승을 고려한 새로운 다항로짓 기반 통행배정 모형을 제시한다. 특히 본 연구에서 제시하는 모형은, 통행 시간, 경로의 최소 운행횟수, 환승 저항 등 다양한 변수가 포함된 효용함수가 주어져 있을 때, K개의 최대 효용을 갖는 경로를 탐색하는 알고리즘을 포함하고 있다.

• 상하수도학회지
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• 제25권3호
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• pp.325-334
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• 2011

Market Environment around water work industry is rapidly changing. ISO, International Organization for Standardization, announced the international water work service standard for comparison and evaluation between nations and businesses. And developed countries in water work are introducing market principle for growth of nation's water industry and reinforcement of its competitiveness. Also, some local governments entrusted their water utilities for improvement of competitiveness of water work. However, as some failure cases from overseas came out with emphasis, there are many refuting perspective about entrusted operation achievements of domestic water market. Hence, this paper evaluated competitiveness of domestic local water utilities from the perspective of productivity. After evaluating productivity using Malmquist productivity index, the authors compared and analyzed whether there is a difference of productivity between two different operating types by using Mann-Whitney test. As a result of analysis, it has shown that local water utilities achieved higher productivity at entrusted operation type rather than direct operation type. The local water utilities which chose entrusted operation had increased the productivity 13.9% on total factor productivity(TFP) during experimenting period, while the local water utilities which chose direct operation had increased 0.2%. The background of achieving this high productivity in entrusted operation was analyzed as a result of the higher technological effectiveness of a special water company. The result of this study can be referred when local government needs to decide on what operating types they will use.

• 한국조명전기설비학회지:조명전기설비
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• 제10권5호
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• pp.75-82
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• 1996

전지전력저장시스템(BESS)은 날로 심화되어 가는 부화율의 하락현상을 보완해 줄 수 있으며, 순동예비력, 전압 및 주파수제어, 발전 및 송배전 설비의 투자지연 효과, 공급신뢰도 향상 등의 효과를 가지고 있다. 이러한 BESS를 개발완료하여 실용화하기 위해서 경제성 평가가 수반되어야 한다. 본 연구에서는 Sysplan Model을 국내 실정에 맞게 수정 보완하여 경제성 평가를 통한 투자가치를 분석하였다.

• 동아시아식생활학회지
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• 제26권4호
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• pp.285-296
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• 2016

This study was conducted to obtain a better understanding of American green tea consumers for increasing Korean green tea sales in the US market. In doing so, this study investigated green tea choice attributes of US consumers and segmented them based upon their perceptions about important attributes of green tea. A factor-cluster segmentation approach was used for this study. An exploratory factor analysis identified five green tea choice motives: 'Sensory', 'Diet', 'Price', 'Health', and 'Brand'. Based upon these five choice attributes, cluster analyses classified all respondents into four homogeneous subgroups: 'Highly motivated', 'Taste/Price oriented', 'Health oriented', and 'Brand oriented'. Cross-tab tests proved that green tea consumption and purchasing patterns were significantly different among the four clusters. In particular, two cluster groups representing 'Highly motivated' and 'Health oriented' groups were found to offer the most utility for further American green tea market segmentation research. Findings show that American green tea consumers include a wide range of age groups and they usually buy green tea at grocery markets. Managerial implications for all cluster groups based upon their unique characteristics are provided. Korean green tea companies can apply these findings in order to develop more effective and efficient marketing strategies to attract American consumers to buy more Korean green tea.

• Journal of the Korean Data and Information Science Society
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• 제26권1호
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• pp.41-53
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• 2015

기상분야에서는 다양한 미기상해석모듈 (micro scale weather analysis module)을 개발하여 초고분해능의 기상정보서비스를 실시간으로 제공하고자 노력하고 있다. 이와 같은 연구들은 최근 대도시의 양적인 팽창으로 인해 발생되는 도시 미기상 (micro meteorology)의 급격한 변화에 효과적으로 대처할 수 있는 경제적 사회적 활동을 가능케 한다. 따라서 미기상해석모듈의 정확성은 도시 미기상정보서비스의 품질 및 효용성에 직결된다. 본 논문은 미기상해석모듈이 생성하는 시-공간적인 특성을 가진 양적인 결과물의 정확성에 대한 평가체계를 설계하였다. 이와 더불어 평가체계의 구성에 사용될 평가도구로써 시계열평균의 동일성검정 알고리즘을 스펙트럼 분석기법으로 구축하였으며, 동일성 검정통계의 함수를 거리측도로 사용하는 시계열 군집분석법도 함께 개발하였다. 또한, 사례연구를 통해 제안된 군집분석법과 평가알고리즘의 유용성을 보였다.

• 사회복지연구
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• 제40권2호
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• pp.33-58
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• 2009

본 연구 목적은 기초 지방정부 사회복지예산의 구조적 특성과 그것의 변화에 영향을 미치는 관련 요인을 탐색하는 것이다. 서울시 구로구의 8개년도 예산서(2000년-2007년)를 사례로 선정하였고, 원 예산서를 사회복지의 내재적 특성에 따라 분석하기 위해 재분류할 수 있는 분석틀을 개발하였다. 원 예산서 사회복지비를 '대상', '성질', '재원츨처'에 따라 분류한 분석틀은 유용한 것으로 확인되었고, 시계열분석, 교차분석을 통해 다양한 특성이 기술분석 되었다. 기존 연구에서 주장되었던 중앙정부 정책 요인뿐만 아니라 광역정부 요인도 지방정부 사회복지비에 상당한 영향을 미치는 것으로 확인되었다. 반면 선행연구에서 주장되었던 점증주의 요인, 재정자립도 요인의 영향은 분명하지 않았다. 따라서 상위정부가 미치는 영향력은 타요인에 비해 상대적으로 크지만, 지방정부 자체 요인은 미흡하다. 본 연구는 비록 사례연구로서 일반화의 한계를 갖고 있지만, 지방정부 사회복지 예산서를 분석할 수 있는 방안을 마련하였고, 그것을 기반으로 다양한 후속 연구로 발전될 수 있는 지평을 확장하였다.