• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2004년도 춘계학술대회 논문집
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• pp.413-419
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• 2004

해상 구간에서의 선박 운항과 관련된 단위 비용이 선박 대형화에 비례하여 감소한다는 규모의 경제에 근거하여 최근 8,000 TEU급 선박이 운항을 개시하였고, 10,000 TEU급 이상 초대형선(mega ship)이 설계 단계에 있다. 기존 연구들은 대형항만에서 대형항만까지의 총운항비 관점에서 연구가 진행되어졌으나, 본 연구에서는 운항비, 항만비용(하역비 포함), 피더비용 등 총비용적 관점에서 허브항으로 선택된 항만별 경제성 평가를 하는데 목적이 있다.

• 교육시설
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• 제16권2호
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• pp.27-36
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• 2009

The Korean government has recently implemented the public policy, so-called the Dormitory-based Public High-School Operation. The policy aims at providing the community-based high-quality education for the high-school students in the regional areas including agricultural, sea-side, and mountainous territories. Since the schools will be open for 24 hours a day during a whole year, they need to develop educational programs after regular school hours and violence prevention systems to maintain stable surroundings for study. In doing so, it is required for the schools to set up a systematic dormitory operation & administration program reflecting the demands of the dormitory users. Most of the schools, however, have not experienced operating a dormitory, thereby do not have any clues to successfully build the dormitory system. The main objective of this research is not only to provide the information on the demands of the dormitory users and their concerns with the demands but also to suggest guidelines to better build the system through conducting questionnaire survey to the students in a currently operated dormitory-based high-school.

• 한국통신학회논문지
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• 제41권12호
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• pp.1721-1735
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• 2016

Power-efficient base station (BS) operation is one of the important issues in future green cellular networks. Previously well-known BS operation schemes, the cell zooming scheme and the cell wilting and blossoming scheme, require tight cooperation between cells in cellular networks. With the previous schemes, the non-cooperative BSs of a serving cell and neighboring cells could cause coverage holes between the cells, thereby seriously degrading the quality of service as well as the power saving efficiency of the cellular networks. In this paper, we propose a novel power-efficient BS operation scheme for green downlink heterogeneous cellular networks, in which the networks virtually adjust the coverage of a serving macrocell (SM) and neighboring macrocells (NMs) without adjusting the transmission power of the BSs when the SM is lightly loaded, and the networks turn off the BS of the SM when none of active users are associated with the SM. Simulation results show that our proposed scheme significantly improves the power saving efficiency without degrading the quality of service (e.g., system throughput) of a downlink heterogeneous LTE network and outperforms the previous schemes in terms of system throughput and power saving efficiency. In particular, with the proposed scheme, macrocells are able to operate independently without the cooperation of a SM and NMs for green heterogeneous cellular networks.

• 한국동물위생학회지
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• 제33권3호
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• pp.309-312
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• 2010

This was conducted to determine the effects of body weight, organ weight, hematological values and biochemical parameters by L-carnitine in the ovariectomized (OVX) rats. The animals were divided into 4 groups. Intact group (n=10) received no treatment and operation. Sham group (n=10) received only sham operation and no treatment. OVX group (n=10) received operation and no treatment. OVX+Carn group (n=10) received operation and L-carnitine. Body weight was significantly lower in OVX+Carn group than in all other groups. Also, organ weight such as heart, liver, spleen and kidney was measured. The heart and spleen weight were significantly lower in the OVX+Carn group than in the Intact and Sham group. The liver weight in the OVX+Carn group was significantly differences in comparison with those in the other groups. Also, there was significantly differences in the organ weight of kidney between in the OVX+Carn group and in the other groups. The hematological values of WBC, RBC, MCV, MCH and MCHC were no significant differences in any other groups. The total cholesterol, triglyceride and high density lipoprotein decreased significantly in the OVX+Carn group as compared to those in the OVX group. But, there were no significant differences in low density lipoprotein in any other groups. We conclude that L-carnitine enhanced the body weight in the ovariectomized rats. Our findings suggest that L-carnitine may influence the process of absorption of fat in the ovariectomized rats.

• International Journal of Knowledge Content Development & Technology
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• 제14권1호
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• pp.111-136
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• 2024

In this study, we collaborated with the National Library of Korea's Library Education Institute to pilot the operation of a librarian learning community and aimed to measure its effectiveness based on the improvement of librarian competencies. A total of 28 participants attended four programs, and the research results are as follows: First, when analyzing competencies in terms of community capacity, attitude competency was the highest, followed by knowledge and skills competencies in that order. The correlation analysis among competencies showed that there were mutual correlations among the three competencies. Second, in the pre-post analysis of the three competencies and their sub-competencies, it was found that all competencies, including sub-competencies, improved. Based on the research results, it was confirmed that through the operation of the librarian learning community, the average competencies of librarians can be improved, which can directly impact the enhancement of the library's service capabilities. Therefore, it is believed that there is a need to activate the operation of librarian learning communities and explore nationwide dissemination strategies for the operating model.

• 디지털융복합연구
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• 제15권8호
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• pp.45-58
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• 2017

한국의 포워딩산업에서의 업체 간 경쟁은 현재 매우 치열하다. 그러나 포워딩산업의 서비스품질에 관한 연구가 한국과 전 세계적으로 아직 매우 적다. 본 연구는 포워딩산업의 특성을 반영한 포워더의 서비스품질 요인들을 도출하는 것을 연구의 목적으로 하였다. 서비스품질의 측정항목들을 선행연구와 면접조사를 통해 정리한 후, 한국의 수출입업자들을 대상으로 설문조사를 하였으며, 수집된 자료들에 대해 탐색적 요인분석을 실시하였다. 연구결과, 포워더의 서비스품질요인은 정확성, 신속 정시성, 안정성으로 정의되는 운영특성과, 전문성과 공감성으로 정의되는 고객지향성의 두 요인으로 도출되었다. 본 연구의 중요한 기여는 선행연구들과 달리 포워딩산업의 특성을 반영한 서비스품질요인을 제시하였다는 점이다. 향후의 연구과제는 두 요인 중 어느 것이 고객충성도에 더 많은 영향을 미치는 지를 분석하는 것이다.

• 인터넷정보학회논문지
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• 제19권2호
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• pp.17-26
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• 2018

최근 사물인터넷 서비스의 등장 및 융합으로 통합 사물인터넷 서비스 플랫폼에 관한 다양한 연구가 진행되었다. 현재 사물인터넷 서비스는 서비스 제공자의 목적에 따라 독립적인 시스템으로 구축되어 유사한 서비스를 제공하는 서비스 간의 정보 교환 및 모듈 재사용이 불가능 하였다. 이에 본 연구에서는 통합 사물인터넷 플랫폼 환경을 제공하기 위하여 다양한 서비스들의 세부 동작 기반 서비스 분류 알고리즘을 제안한다. 구현을 통하여 상용화된 100여개의 사물인터넷 서비스를 분류 및 군집화를 진행하였으며 이를 기반으로 K-means알고리즘과 비교하여 제안하는 알고리즘의 성능을 평가하였다. 또한 표본 집단의 부족으로 발생하는 단일 클러스터를 방지하기 위하여 K-means 알고리즘을 활용하여 재 군집화를 진행하였다. 향후 연구로 기존의 서비스 표본 집단을 확대하고 현재 구현한 분류 시스템을 보다 빠르고 대량의 데이터 처리를 위하여 스파크를 활용할 예정이다.

• 대한지역사회영양학회지
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• 제17권2호
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• pp.194-204
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• 2012

The purpose of this study was to investigate school dietitians' satisfaction with and needs for School Meal Service Support Centers. A web-based on-line survey was conducted with 1,102 nutrition teachers or school dietitians using four School Meal Service Support Centers during the summer of 2011. The data from 578 respondents (52.5%), consisting of 165 (44.4%), 334 (53.4%), 41 (67.2%), and 38 (86.4%) dietitians using Seoul, Gyeonggi, Suncheon and Gyeongju centers, respectively, were analyzed. The main reason for using the centers was subsidies from local governments. The dietitians using the metropolitan centers, which were Seoul and Gyeonggi centers, tended to buy agricultural products through the centers only, and those using local centers, which were Suncehon and Gyeongju centers, bought those products from the private suppliers as well as from the centers. The dietitians' overall level of satisfaction with the centers was not high showing 3.3 out of 5 points; it was significantly associated with the operating system and services of the centers such as system efficiency, delivery accuracy, communication, and information provision rather than the agricultural products provided by the centers. The dietitians preferred joint operation of the centers by local governments and producers' groups. They wanted School Meal Service Support Centers to be evaluated every year. It was suggested that efforts should be made to improve the operation system and service of School Meal Service Support Centers for improving dietitians' satisfaction with the centers. In addition, an evaluation system for School Meal Service Support Centers should be implemented soon based on school dietitians' needs.

• 한국시뮬레이션학회논문지
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• 제20권3호
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• pp.89-100
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• 2011

새로운 교통수단으로서 실용화가 진행 중인 자기부상열차 시스템은 무인자동운전으로 운영되며, 사전에 면밀한 열차운행 계획의 수립과 검증이 요구된다. 일반적으로 열차운행 계획을 수립할 때는, 노선계획에 따른 통계화된 수송수요 예측자료를 활용하지만, 실제 열차 운행 시에는 수송 파동이 생길 수 있으며, 이를 고려하여 열차 운행 계획과 서비스 품질을 사전에 검토할 수 있는 수요기반 시뮬레이션 기술이 요구된다. 본 연구에서는 연속적인 수요파동을 반영할 수 있는 자기부상열차 운행 시뮬레이션 방법 및 모델을 제시하였다. 이를 위해, 열차 운행에 따른 승객 수송과정을 가장 효과적으로 모사할 수 있는 이산사건 모델을 적용하였으며, DEVS 형식론을 이용하여 시스템을 체계적으로 모델링 하였다. 또한, DEVSim++시뮬레이션 환경을 이용한 구현과 실험을 통해, 제안한 모델에 대한 구현 가능성을 검증하였고, 이러한 수요기반 시뮬레이션을 이용하면 운행계획과 전략에 대한 효과적인 사전 검토가 가능함을 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.342-348
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• 2009

Many rail operators have developed ticketing systems for the use of rail service and the increase of operation revenue by AIM, E-ticket and mobile tickets. Also they have operated rail pass for rail revenue by foreign tourists. Russian railways (RZD) has similar rail systems with CIS countries and sometimes same tickets. A few years ago, RZD introduced and operated E-ticketing system for the increase of passenger's convenience and operation revenue, and CIS countries have adopted and widely used this system. This study will introduce the revenue business by E-ticketing system of RZD, and forecast Russian railroad business in the future.