• 지능정보연구
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• 제12권1호
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• pp.75-93
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• 2006

화주의 선박 선정과정은 선박과 화물의 일정에 따른 1차 선정과 화물을 재선적하여 하나의 단위로 선복을 집중시키는 2차 선정으로 구분된다. 지금까지 3자 물류업체는 이러한 선적업무가 수작업으로 진행됨으로써 비효율성을 초래하였다. 그러므로 본 연구에서는 에이전트 협상을 통해 전체 물류비를 감소시킬 수 있는 방안을 제안하고자 한다. 화물의 집중과 배분을 통해 얻을 수 있는 물류비 절감을 최대화시키기 위해 재고비와 운송비간의 상관관계에 서 최적점을 찾아야 하며 이를 화주간 협상으로 해결할 수 있다. 실험에서는 현업에서 이루어지는 화물 선적방법인 EPDS(Earliest Possible Departure-Date Scheduling)와 LPDS(Latest Possible Departure-Date Scheduling)에 본 협상방법론을 접목하여 SBF(Scheduling Bundle Factor, 선적동시 처리량)에 따른 재고비, 운송비 그리고 물류비등을 도출하고 실험결과를 분석하였다. 분석결과, 에이전트 기반의 협상방법론이 EPDS와 사용될 경우 전체 물류비를 최소화시킬 수 있었다.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1998년도 추계학술대회 및 정기총회
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• pp.12-16
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• 1998

The purpose of this paper is to develop a knowledge-based real-time decision support system to support decision makers for efficient berth operation of Inchon Port. In these days, the efficient berth operation has been many studied. The berth operation rules differ from port to port and the problem is highly dependent on natural, geographical and operational environment of port. In Inchon Port, the ship's entrance into port and departure from port is extremely affected by the status of dock and berth because of capacity restriction. First, we analyzed the specific characteristics of Inchon Port such as dock based on the data of 1997. And then, we construct the database of experts knowledge for berth utilization. Finally, we build the real-time decision support system for the efficient berth operation of Inchon Port to make the better berth allocation in case of not only regular scheduling but also dynamic scheduling such as delay in berth operation and exchange of ship between berths. The DSS is developed with graphic user interface(GUI) concept to help the user determining user interactive updating of the port status. Then this DSS will be provide decision maker with an efficient and fast way to berth allocation, and reduce wastes of time, space, and manpower in Inchon Port operation.

• 한국자동차공학회논문집
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• 제20권6호
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• pp.39-45
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• 2012

More than 80 percent of traffic accidents related with lane departure believed to be the result of crossing the lane due to either negligence or drowsiness of the driver. Lane-departure related accident in the highway usually involve high fatality. Even though LDWS is believed to prevent accident 25% and reduce fatalities by 15% respectively, its effectiveness in performance is yet to be confirmed in many aspects. In this study, the vehicle lateral locations relative to warning zone envelop (earliest and latest warning zone) defined in ISO standard, ECE and NHTSA regulations are compared with respect to various factors including delays, vehicle speed and vehicle heading angle with respect to the lane. Since LDWS is designed to be activated at the speed over 60 km/h, vehicle speed range for the study is set to be from 60 to 100 km/h. The vehicle heading angle (yaw angle) is set to be up to 5 degree away from the lane (abrupt lane change) considering standard for lane change test using double lane-change test specification. The TLC is calculated using factors like vehicle speed, yaw angle and reaction time. In addition, the effect of vehicle type has been considered to assess LDWS safety.

• Journal of Multimedia Information System
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• 제5권1호
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• pp.9-14
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• 2018

A road recognition system or Lane departure warning system is an early stage technology that has been commercialized as early as 10 years but can be optional and used as an expensive premium vehicle, with a very small number of users. Since the system installed on a vehicle should not be error prone and operate reliably, the introduction of robust feature extraction and tracking techniques requires the development of algorithms that can provide reliable information. In this paper, we investigate and analyze various real-time road detection algorithms based on color information. Through these analyses, we would like to suggest the algorithms that are actually applicable.

• 대한교통학회지
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• 제13권4호
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• pp.79-103
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• 1995

The elasticity of a model is considered most important. Without showing the proper elasticity any model cannot provide useful information for decision making. This paper demonstrates a macro model which can generate dynamic transport informations every 15 minutes. Without the Wardrop principles and the monotonicity assumptions for the link travel time and link volume relationship, the basic elements of this new modeling approache are composed of link density simulation, stochastic incremental route choice, departure time choice, destination choice and mode choice. The elasticity of the proposed model is examined based on elasticity equations and simulation results. Also the transferability from a mega city like Seoul to a big city like Daejon is demonstrated for the choice model. The issues centering around the dynamic relations among density(k), speed(u), and flow rate(v) are also discussed for the modeling of highly congested situations.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권12호
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• pp.4489-4501
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• 2014

We propose a novel lane detection method based on classification in image sequences. Both structural and statistical features of the extracted bright shape are applied to the neural network for finding correct lane marks. The features used in this paper are shown to have strong discriminating power to locate correct traffic lanes. The traffic lanes detected in the current frame is also used to estimate the traffic lane if the lane detection fails in the next frame. The proposed method is fast enough to apply for real-time systems; the average processing time is less than 2msec. Also the scheme of the local illumination compensation allows robust lane detection at nighttime. Therefore, this method can be widely used in intelligence transportation systems such as driver assistance, lane change assistance, lane departure warning and autonomous vehicles.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2017년도 추계학술대회
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• pp.395-398
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• 2017

Smart Ship은 현재 많은 논의가 진행중인 주제 중 하나입니다. 그 이유는 유사한 연구의 양이 증가하고 가속화되고 있기 때문입니다. 그 증거로 빅 데이터, 클라우드 및 IoT 등의 첨단 기술을 활용하여 선박간의 이동, 안전, 데이터 교환, 감시 시스템 문제를 해결하고 있습니다. 해양 기술에서 위와 같은 기술을 활용하는 것은 바다 위 선박간의 발생 할 수 있는 다양한 문제뿐만 아니라 항만과 통신하는 것에도 중점을 둡니다. 본 논문에서는 선박 및 항구를 위한 IoT 기반의 지능형 보고 및 정박시스템을 제안합니다. 본 시스템은 선박이 정박할 경우 IoT 기술을 활용하여 자동으로 관리 시스템에 통보하며, 이후 정박을 원하는 다른 선박들에 대하여 빠르고 안전하게 남은 위치를 유도합니다. 시스템은 선박 계류 중에 시간, 노력 및 비용을 최소화 할 수있는 편의를 제공합니다. 이와 같은 시스템은 선박의 표류 시간, 비용을 최소화 할 수 있는 편의를 제공하게 됩니다.

• 대한교통학회지
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• 제21권4호
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• pp.17-27
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• 2003

공항여객 처리시설의 혼잡해소에 관한 연구는 주로 공항접근교통시스템의 확충이나 터미널의 확장 등 물리적인 방법에 집중되어 왔다. 물리적인 확장은 막대한 투자비용이 뒤따라야 하는 문제가 있기 때문에 공항운영과 같은 소프트웨어 측면에 대한 접근방식을 적극 도입하여 투자비용을 줄이고 효율적인 공항운영을 꾀하는 것이 필요하다. 본 연구는 공항운영의 효율성 증진을 위한 대안 중 하나로서 여객들이 공항에 도착하는 행태가 어떻게 나타나는 지를 분석하여. 향후 여객터미널 운영에 적용할 수 있는 유용한 정보를 제공하는데 그 목적이 있다. 서로 다른 접근소요 시간을 가진 여객들이 항공기 출발예정시간(STD:scheduled time of departure) 이전에 도착하는 확률함수를 도출하고, 이를 이용하여 STD 이전시간 임의구간에서 여객이 도착하는 확률을 구할 수 있는 모형을 개발코자 하였다. 또한 이 모형을 공항 여객터미널에 적용하여 운영시간대별 도착 여객수를 산출하는 과정을 제시하고자 하였다. 본 연구에서 분석된 공항접근시간에 따른 STD 이전시간대별 공항도착 확률모형은 공항운영자 및 항공사가 공항의 체크인 카운터 운영시간 및 수량 결정, 수하물 처리시스템, 검색보안서비스 등의 운영시점을 결정하는 도구로 이용될 수 있다. 이와 같이 분석된 결과를 토대로 공항운영 상 비효율성을 제거하고 보다 합리적인 인력 투입이나 시설 운영이 가능하게 되는 것이다.

• International Journal of Control, Automation, and Systems
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• 제3권3호
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• pp.502-507
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• 2005

The dual-mode strategy has been adopted in many constrained MPC (Model Predictive Control) methods. The size of stabilizable regions of states of MPC methods depends on the size of underlying feasible and positively invariant sets and the number of control moves. The results, however, may perhaps be conservative because the definition of positive invariance does not allow temporal departure of states from the set. In this paper, a concept of periodic invariance is introduced in which states are allowed to leave a set temporarily but return into the set in finite time steps. The periodic invariance can be defined with respect to sets of different state feedback gains. These facts make it possible for the periodically invariant sets to be considerably larger than ordinary invariant sets. The periodic invariance can be defined for systems with polyhedral model uncertainties. We derive a MPC method based on these periodically invariant sets. Some numerical examples are given to show that the use of periodic invariance yields considerably larger stabilizable sets than the case of using ordinary invariance.

• 한국항해학회지
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• 제24권4호
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• pp.219-226
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• 2000

Ship's position data obtaining method is one of the very important factor in navigation. Nowadays, GPS(Global Positioning System) using the earth orbiting satellites are equipped and operated for the position finding. Because it provides more precise position information than other equipments and is very convenient for navigator. In this study, it is designed to develop the GPS simulator for everybody being able to practise the GPS operating skill like as navigation planning, navigation calculating etc. And also, it can be operated with personal computer without real GPS receiver. This simulation system is based on the real GPS receiver and built by the visual basic 5.0 program. And it displays the ship's position and navigating information and plots the ship's moving track on the screen in real time according as initial setup data-main engine's rpm, rudder angle, departure position and waypoint.