• 한국항공운항학회지
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• 제7권1호
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• pp.77-89
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• 1999

The atmosphere condition at Kimpo International Airport occasionally prevents the aircraft from landing and forces them to fly to an alternate airport, especially in October and November during a year. Many airlines designated foreign airports instead of Korean airports as alternate airports in the case of the bad weather condition preventing use of Kimpo Airport. This paper addresses 1) economic comparison of candidates for the alternate airport, 2) what are the criteria for the alternate airport selection and the relative importance among the criteria and 3) evaluation of candidates for alternate airport using Brown and Gibson's pair-wise comparison method. It is found to be possible to reduce costs related alternate flight by 36% using Korean airports rather than using Japan's Hukuoka Airport. However, airlines weigh more on the factors such as service level of ground handling, accommodation for passengers and ground access convenience than costs. Among Korean airports, Kimhae International Airport is found the most favorable airport as the alternate airport for Kimpo International Airport.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권10호
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• pp.4680-4697
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• 2017

In future, since the user experience plays a more and more important role in the development of today's communication systems, quality of experience (QoE) becomes a widely used metric, which reflects the subjective experience of end users for wireless service. In addition, the energy efficiency is an increasingly important problem with the explosive growth in the amount of wireless terminals and nodes. Hence, a QoE-aware energy efficiency maximization based joint user access selection and power allocation approach is proposed to solve the problem. We transform the joint allocation process to an optimization of energy efficiency by establishing an energy efficiency model, and then the optimization problem is solved by chaotic clone immune algorithm (CCIA). Numerical simulation results indicate that the proposed algorithm can efficiently and reliably improve the QoE and ensure high energy efficiency of networks.

• 한국응용곤충학회지
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• 제28권4호
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• pp.237-243
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• 1989

점박이응애(Tetranychus urticae Koch)의 感受性系統에 대하여 有機燐系 殺婢劑인 ethion, 有機濾素系인 dicofol과 有機朱錫系인 cyhexatin 및 合成pyrethroid系인 biphenthrin 등으로 交互累代潔凉를 實施하여 각 殺婢劑의 抵抗性發遠 差異와 複合抵抗性의 有努 및 程度를 試驗.調宜하었다. Ethion/dicofol(13-13世代) 洵流系統은 ethion에 대하여 49.4浩, dice$\ulcorner$o떼 대하여 18.1倍의 抵抗營,이, othiohjcyhexatin(9-9世代) 洵淪系統은 ethion에 대해서 28.1倍, cyhexatin에 대해서 5借의 抵抗性이, ethionjbiphenthrin(10-10世代) 海治系統은 ethion에 대하여 39,8倍, thrin 에 대하여 19.2倍의 抵抗性이, ficofoljcyhexatin(9-9世代) 海流系統은 dicofo떼 대해서 11.3倍,cyhexatin에 대해서 4.9倍의 抵抗性이, ficofoljbiphenthrin(12-12世代) 海流系統은 dice$\ulcorner$of 에 대하여 11.2借, biphenthrin에 대하여 9.4倍의 氣抗性이, oyhexatinjbiphenthrin(9-9代代) 海流系統은 cyhexatin에 대하여 3.7倍, biphenthrin에 대해서 7.7倍의 抵抗性이 發達하여 海流親婢劑의 組合에 따라 抵抗性發連 水準의 差異가 있었다. Ethion/dicofol 抵抗性系統은 洵流에 駱與하지 않은 biphenthrin에 대하여 率度의 複合抵抗性을 나타내었고, jcyhexatin, ethionjbiphenthrin 抵枕性系統들은 각각 biphenthrin과 dicofe떼 대해서 비교적 낮은 水準의 複음抵抗性을 보펄으며, Oicofaljcyhexatin, Oicofoljbiphenthr운 그리고 cyh訓stinjbiphenthrin 海社系統들은 모두 ethion에 대하여 각각 高虜의 複合抵抗性을 나타내었다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권5호
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• pp.2177-2193
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• 2018

This paper studies resource allocation schemes for the relay-aided cooperative system consisting of multiple source-destination pairs and decode-forward (DF) relays. Specially, relaying selection, multisubcarrier pairing and assignment, and power allocation are investigated jointly. We consider a combinatorial optimization problem on quality of experience (QoE) and energy consumption based on relay-aided cooperative system. For providing better QoE and lower energy consumption we formulate a multi-objective optimization problem to maximize the total mean opinion score (MOS) value and minimize the total power consumption. To this end, we employ the nondominated sorting genetic algorithm version II (NSGA-II) and obtain sets of Pareto optimal solutions. Specially, two formulas are devised for the optimal solutions of the multi-objective optimization problems with and without a service priority constraint. Moreover, simulation results show that the proposed schemes are superior to the existing ones.

• 스마트미디어저널
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• 제4권1호
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• pp.52-57
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• 2015

최근 게임과 무관한 분야에 게임적인 요소를 가미한 게임화 마케팅 기법이 등장하고 현실과 가상의 경계가 허물어지는 대체 현실 게임이 출현하는 등 기존 게임의 범위를 넘어서는 새로운 차원의 게임이 나타나고 있다. 이러한 가능성이 온라인 야구 시뮬레이션 장르의 게임에 도입되고 있다. 본 연구는 최근 인기 있는 프로야구 매니저 게임을 대상으로 3명의 피험자를 통해 GOMS 모형을 구축하는 탐색적 연구이다. 이를 위해 피험자를 대상으로 게임을 플레이한 후에 게임을 통해서 경험한 내용을 녹취하고 녹취된 어휘들을 분석하여 프로야구매니저 게임에 대한 GOMS의 목표(Goal)에 대한 위계적 구조를 개발하였다. 이를 통해 가상과 실제의 경계를 허물고 둘 간의 상호작용으로 대체현실게임의 게임화 가능성을 모색하였다.

• International journal of advanced smart convergence
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• 제10권1호
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• pp.56-61
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• 2021

Neighbor path selection is to pre-select alternate routes in case geographically correlated failures occur simultaneously on the communication network. Conventional heuristic-based algorithms no longer improve solutions because they cannot sufficiently utilize historical failure information. We present a novel solution model for neighbor path selection by using machine learning technique. Our proposed machine learning neighbor path selection (ML-NPS) model is composed of five modules- random graph generation, data set creation, machine learning modeling, neighbor path prediction, and path information acquisition. It is implemented by Python with Keras on Tensorflow and executed on the tiny computer, Raspberry PI 4B. Performance evaluations via numerical simulation show that the neighbor path communication success probability of our model is better than that of the conventional heuristic by 26% on the average.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전력기술부문
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• pp.316-318
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• 2001

Occasionally, equipment in a distribution system fails due to damage from weather, vandalism, or other causes. In addition, it is recommended practice to have some way in which maintenance or replacement of every element in a system can be performed without causing lengthy interruption of electrical service to the customers it feeds. Thus, alternate sources, paths, and configurations of service must be planned so that both failures and maintenance do not affect customer service beyond a reasonable amount. In some cases, planning for alternate routes of service during equipment outages or emergencies -- will be the major aspect influencing selection of a feeder's capacity, type of route, or layout. We want to know the relationship between molt-dividing multi-connection and distribution reliability for contingency support considerations.

• International journal of advanced smart convergence
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• 제12권3호
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• pp.13-18
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• 2023

This paper aims to investigate data features for neighbor path selection (NPS) in computer network with regional failures. It is necessary to find an available alternate communication path in advance when regional failures due to earthquakes or forest fires occur simultaneously. We describe previous general heuristics and simulation heuristic to solve the NPS problem in the regional fault network. The data features of general heuristics using proximity and sharing factor and the data features of simulation heuristic using machine learning are explained through examples. Simulation heuristic may be better than general heuristics in terms of communication success. However, additional data features are necessary in order to apply the simulation heuristic to the real environment. We propose novel data features for NPS in computer network with regional failures and Keras modeling for computing the communication success probability of candidate neighbor path.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권11호
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• pp.1116-1120
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• 2010

본 논문에서 우리는 추천 시스템을 위한 두 개의 정제된 이웃선정 알고리즘을 제시하고, 또한 아이템의 속성정보가 어떻게 고품질의 예측을 위해 사용될 수 있는지를 보인다. 정제된 이웃선정 알고리즘은 가상 이웃과 대체 이웃을 각각 사용하여 이행적 유사도를 기반으로 한 이웃선정 방법을 적용한다. 실험 결과는 본 논문에서 제안한 알고리즘을 적용한 추천 시스템이 다른 시스템에 비해 보다 우수한 성능을 가짐을 보여준다. 이러한 제안 시스템은 예측 품질의 저하 없이 대규모 데이터셋 문제 및 초기 참여자 문제를 극복할 수 있게 한다.

• 대한산업공학회지
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• 제18권1호
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• pp.47-62
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• 1992

This paper describes a procedure for optimizing the route selection and production conditions in alternate process plans under a cellular manufacturing environment. The type of production is mainly production-to-order which deals with unexpected products as the changes factor. The flexible cellular manufacturing can be viewed as a complete unification of both flexible manufacturing process and flexible production management. The integrated problem for designing flexible cellular manufacturing associated with determining the optimal values of the machining speeds, overtime, and intercell flow is formulated as Nonlinear Mixed Integer Programming(NMIP) in order to minimize total production change cost. This is achieved by introducing the marginal cost analysis into the NMIP, which will compute the optimal machining speed, overtime, intercell flow, and routing. The application of this procedure offers greater flexibility to take advantage of the cellular manufacturing due to the optimum use of resources. A solution procedure for this problem was developed and a numerical example is included.