• 터널과지하공간
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• 제25권3호
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• pp.221-230
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• 2015

본 연구에서는 국내외에서 개발된 광산관리 소프트웨어들을 조사하고 그 특징을 분석하였다. 해외에서는 다수의 기업들이 Dispatch, $Cat^{(R)}$ $MineStar^{TM}$, FARA 등과 같은 광산관리 소프트웨어를 개발하고 상용화하였다. 이 소프트웨어들은 실시간 장비 추적, 장비 할당 최적화, 생산량 관리, 장비 상태 모니터링, 원격조종과 같은 기능을 제공한다. 국내에서는 현재까지 상용화된 광산관리 소프트웨어는 없다. 일부 연구자들에 의해 GEMISIMS, Truck-Shovel fleet optimization 등의 소프트웨어가 개발되었으나, 다소 제한적인 기능만을 제공하고 있다. 추가적으로 본 논문에서는 보츠와나 Jwaneng 광산과 미국 Robinson 광산에서 광산관리 소프트웨어를 도입하여 활용한 사례를 조사하여 그 결과를 제시하였다.

• 한국항행학회논문지
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• 제27권6호
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• pp.716-723
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• 2023

최근 보다 혁신적인 모빌리티 산업의 패러다임을 변화시키기 위해 도심항공교통 (UAM; urban air mobility) 도입에 관한 논의가 전 세계적으로 활발히 진행되고 있다. 한국형 UAM의 성공을 위해 공역, 버티포트, 항법, 통신 등과 관련된 연구는 관련 연구기관 주도하에 활발히 이루어지고 있으나, UAM 운항사의 운항 관리 개념 정립, 통제절차 개념 수립 등에 대한 연구는 거의 이루어지지 않고 있다. UAM의 상용화를 위해서는 복수의 UAM 운항자의 개별 시스템 개발의 기준이 될 수 있는 표준화된 운항 관리 개념 정립이 필요한 시점이다. 이에 본 논문에서는 UAM 특별법 미적용 사항을 살펴본 후 이로부터 운항사가 준비해야 할 사항과 기존 민항기 및 회전익 항공기의 관련 규정에 대해서 분석하고, 국내 저밀도 운항 관리 및 통제절차 개념 수립을 위한 적합한 방안을 제시하였다. 본 논문에서 제시한 초기 저밀도 환경에서의 UAM 운항 관리 및 통제절차 개념 수립 방안을 착안하여 추후 시범 운영 및 UAM 대중화에 기여할 수 있을 것으로 기대한다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.171-178
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• 2002

At the present time, container transportation plays a key role in the international logistics and the efforts to increase the productivity of container logistics become essential for Korean trucking companies to survive in the domestic as well as global competition. This study suggests an approach for determining fleet size for container road transportation with dynamic demand. Usually the vehicles operated by the transportation trucking companies in Korea can be classified into three types depending on the ways how their expenses occur; company-owned truck, mandated truck which is owned by outsider who entrust the company with its operation, and rented vehicle (outsourcing). Armually the trucking companies should decide how many company-owned and mandated trucks will be operated considering vehicle types and the transportation demands. With the forecasted monthly data for the volume of containers to be transported a year, a heuristic algorithm using tabu search is developed to determine the number of company-owned trucks, mandated trucks, and rented trucks in order to minimize the expected annual operating cost The idea of the algorithm is based on both the aggregate production planning (APP) and the pickup-and-delivery problem (PDP). Finally the algorithm is tested for the problem how the trucking company determines the fleet size for transporting containers.

• International Journal of Computer Science & Network Security
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• 제23권1호
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• pp.64-70
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• 2023

Maritime transport is dominant in the overall volume of all international transportation. Existence and overcoming of problems, which cause pressure on shipping safety, remain actual and fully concern both maritime and inland transport. Increasing speed and cargo capacity of the ships along with the reduction of crew members lead to the automation of a growing number of work processes, which indicates the need to actively introduce appropriate measures in the security system of sea-going ships and commercial ports and to develop modern approaches to minimize negative events and incidents in the process of ship operation. Advantages in use of modern methods of monitoring the safety of ship operations, management of possible events and incidents, including investigation of accidents, first, aimed at prevention of negative occurrences and ways of prevention on this basis. Considering statistics on incidents increase, this work presents analysis of general ship accident rate, study of major accidental events growth annually, and investigation of causes of incidents, which most frequently occur in port waters and at open sea. A survey of current approaches to ensuring the safety of shipping by implementing effective tools, such as event and incident management, has been conducted.

• Strategy21
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• 통권42호
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• pp.258-292
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• 2017

This paper is designed to make a national strategic concept for the ROK's maritime security and to explore cooperation directions for the ROK Navy and Coast Guard in order to implement the newly-made maritime security strategic concept. As strategy is composed of three main categories(goals, ways, means), the goal of the ROK's maritime security strategy is 'Safe and Affluent Sea' and the way to realize the goal is the principle of cooperative leverage, and the means as tasks to implement the strategic concept are maritime safety, maritime security, and maritime stewardship. The concept of national fleet as used in the US is applied to promoting the cooperation between the ROK Navy and Coast Guard. Thus, under the newly-established maritime security strategic concept along with the national fleet model, followings are suggested as policy proposals for facilitating mutual cooperation between the ROK Navy and Coast Guard in dealing with not only traditional threats but also non-traditional treats at sea and from the sea as well. First, the ROK Navy and Coast Guard has been making efforts to enhance interoperability between the two sea services. However, the mutual cooperations have been focused mainly on areas on operational level rather than policy level. Therefore, the two sea services are recommended to enlarge exchanges and cooperation in policy areas. Second, there are still demands for further cooperation areas between the two sea services in command and communications. The interoperability in C2 between the two needs to be upgraded even to the areas of anti-terrorist activities ar sea, ASUW, ASW, maritime interdiction, etc. Third, mutual comparability between the two needs to be reflected in the maritime forces development to ensure the comparability in UNREP and other logistics areas. Fourth, the standardization of logistical materials and equipments is needed as a way of sustaining operational capability and logistical capacity for the ROK Navy and Coast Guard as well. Fifth, the ROK Navy and Coast Guard are recommended to participate more actively in international maritime cooperation activities such as PASSEX. Sixth, Complementary laws and regulations need further to be revised and to be newly made for collectively managing swiftly maritime accidents and natural disasters at sea.

• 한국항해항만학회지
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• 제37권6호
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• pp.647-653
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• 2013

Energy acquisition due to the increase of oil price is one of the most important issues and policy for most countries. Various tankers have been built in the world and sent to the trade market. It is necessary to build the port infrastructure and facilities to give them proper services such as mooring, packing, storing, and transshipment, etc. However, the domestic guidelines or standards for design and construction for the dolphin berth among these facilities are out of date and do not meet the recent trend of tanker types. Therefore, it requires amendment on the guidelines or standards. In this study, a detailed analysis of the tanker fleet, covering 8,000 ships under operation and order to build, is made to estimate the proper PBL(Parallel Body Length) of each tanker class. After discussion and comparison on the dolphin berth design and construction codes of various countries, those are the leading countries of tanker operation and management, suggestion was made to amend on the design code. The referred codes are of Korea, Japan, UK, USA, and Canada. The analysis of tanker fleet shows the PBL as 0.45L under the normal ballast condition. In order to verify the deduced amendment on the domestic design code for dolphin berth, it was selected one of the domestic dolphin berth, located at the Yeosu oil terminal, which is almost completed to construct. The design criteria and expected tankers to moor in that terminal were analyzed and the appropriateness and countermeasure for deficiency were summarized.

• 대한토목학회논문집
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• 제37권6호
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• pp.1063-1076
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• 2017

토공의 생산성을 향상시키기 위하여 선행 연구에서 건설장비 플릿관리 시스템이 제시되었다. 그러나 이론과 실제 사이에 차이가 존재하였다. 이러한 문제점을 극복하기 위하여 전문가와 엔지니어들의 의견을 구하여 네 가지 개선사항을 제시하고 기존의 시스템에 적용을 하였다. 첫 번째로, 기존의 시스템은 하나의 하드웨어로 구성되어 있어서 오피스와 건설장비에 동시에 설치하여 사용을 할 수 없었다. 따라서 오피스와 건설장비에 별도로 탑재하여 사용할 수 있도록 서버모듈과 모바일 모듈로 분리하여 개발을 하였다. 두 번째로, 기존의 시스템에 사용된 수송모델 알고리즘은 토량배분시 최소의 이동거리를 제시하지만 성토구역이 모여 있지 않게 계획이 됨으로써 생산성 저하를 가져오는 문제점이 있었다. 이러한 문제점을 해결하기 위한 개선된 알고리즘을 제시하였다. 세 번째로, 자동화된 좌표변환이 가능하게 함으로써 토공현장의 3D 지형도상에 실시간으로 건설장비의 위치가 나타나도록 개선하였다. 네 번째로, 토공작업 초반에 장비그룹이 형성되고 작업상태나 현장상황에 따라서 장비의 수가 변화해야 하는데 기존의 시스템에서는 이러한 기능이 적절하게 작동하지 않았다. 개선된 시스템에서는 이러한 문제점이 수정되었다. 이러한 개선사항들은 제시된 시스템을 더욱 현실적으로 적용 가능한 시스템으로 만들게 되며 궁극적으로 토공작업의 생산성 향상을 도모할 수 있게 할 것이다.

• 한국항해항만학회지
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• 제35권9호
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• pp.765-776
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• 2011

For container shipping company, fuel oil prise is a considerable expense. Since 2008, fuel oil prises have risen dramatically. An increasing fuel oil price in container shipping, in the short term, is only partially compensated through surcharges and may affect earnings negatively. This study discusses the impact of an increasing fuel oil price and capital costs for vessels on the Asia-Europe trade of 'H' Shipping Company. According to the result of 'H' carrier's operation in 2008, there were no cost differences between 8 and 9 vessels operations in case of fuel oil price with USD 169/tons while adopting USD 31,818 as a fixed cost. We can expect that the fuel oil price will not go lower than USD 200/Ton on the basis of current high oil price phenomenon. When the fuel oil price is over USD 200/ton, 9 vessel operation is more economic than 8 vessel operation even if the fixed cost is over USD 35,000.

• Nuclear Engineering and Technology
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• 제40권6호
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• pp.517-526
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• 2008

The widespread concern regarding the management of spent fuel that mainly contributes to nuclear waste has led to the development of the sodium-cooled fast reactor (SFR) as one of the most promising future types of reactors at both national and international levels. Various reactor deployment scenarios with SFR introductions with different conversion ratios in the existing PWR-dominant nuclear fleet have been assessed to optimize the SFR deployment strategy to replace PWRs with the view toward a reduction in the level of spent fuel as well as efficient uranium utilization through its reuse in a closed fuel cycle. An efficient reactor deployment strategy with the SFR introduction starting in 2040 has been drawn based on an SFR deployment strategy in which burners are deployed prior to breakeven reactors to reduce the amount of PWR spent fuel substantially at the early deployment stage. The PWR spent fuel disposal is reduced in this way by 98% and the cumulative uranium demand for PWRs to 2100 is projected to be 445 ktU, implying a uranium savings of 115 ktU. The SFR mix ratio in the nuclear fleet near the year 2100 is estimated to be approximately 35-40%. PWRs will remain as a main power reactor type until 2100 and SFRs will support waste minimization and fuel utilization.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1998년도 창립기념 춘계학술대회 논문집
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• pp.172-183
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• 1998

The purpose of this study is to reduce the number of employees hired by Seoul Metropolitan Subway Corporation(SMSC) as a way of responding to deteriorating financial deficit problem. For the reduction, the personnel structure of Seoul Metro Rapid Transit Subway(SMRTS) newly founded in 1995 is benchmarked. Several assumptions are set for seeking the persuasive alternative; 1) no compulsory reduction of existing personnel, 2) raising the salary of SMSC to the same level of SMRTS for compensating intensified work burden, 3) hiring new employees to the amount of one-third of the reduced workforce for minimizing the problems associated with the reduction. The study suggests that the personnel reduction in relevant parts be planned in the following ways; 1) passenger transport part: from daily 3 shifts of 4 group to 2 shifts of 3 group, 2) fleet inspection, civil d: electric engineering, railtrack maintenance, signal parts: from 12 day-off to 10day-off, 3) architecture, AFC parts: from 2 shifts of 3 group to daily work, 4) fleet maintenance, architecture parts: expanding out-sourcing ＆ automation, and 5) headquarter part: 10% reduction of the total of office workers. The study finds, by implementing the plan, that 1,270 employee can be reduced, and that aggregate 106.8 billion won will be saved for the next 10 years.