• International Journal of Aeronautical and Space Sciences
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• v.13 no.3
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• pp.377-385
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• 2012

The Automatic Dependent Surveillance Broadcast (ADS-B) system is a key component of CNS/ATM recommended by the International Civil Aviation Organization (ICAO) as the next generation air traffic control system. ADS-B broadcasts identification, positional data, and operation information of an aircraft to other aircraft, ground vehicles and ground stations in the nearby region. This paper explores the ADS-B based trajectory prediction and the conflict detection algorithm. The multiple-model based trajectory prediction algorithm leads accurate predicted conflict probability at a future forecast time. We propose an efficient and accurate algorithm to calculate conflict probability based on approximation of the conflict zone by a set of blocks. The performance of proposed algorithms is demonstrated by a numerical simulation of two aircraft encounter scenarios.

• International Journal of Aeronautical and Space Sciences
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• v.10 no.1
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• pp.37-45
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• 2009

A method of conflict detection and resolution is described by using simple geometric approach. Two VAVs are dealt with and considered as point masses with constant velocity. This paper discusses en route aircraft which are assumed to be linked by real time data bases like ADS-B. With this data base, all DAVs share the information each other. Calculating PCA (Point of Closest Approach), we can evaluate the worst conflict condition between two VAVs. This paper proposes one resolution maneuvering logic, which can be called 'Vector Sharing Resolution'. In case of conflict, using miss distance vector in PCA, we can decide the directions for two VAVs to share the conflict region. With these directions, VAVs are going to maneuver cooperatively. First of all, this paper describes some '2-D' conflict scenarios and then extends to '3-D' conflict scenarios.

• Maritime Security
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• v.1 no.1
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• pp.273-310
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• 2020

This study aims at empirically analyzing the overall mechanism of the "Gray Zone Strategy", which has begun to be used as one of Chinese major maritime security strategies in maritime conflicts surrounding the South China Sea and East China Sea since early 2010, and comparing the resulting conflict patterns in those reg ions. To this end, I made the following two hypotheses about Chinese gray zone strategy. The hypotheses that I have argued in this study are the first, "The marine gray zone strategy used by China shows different structures of implementation in the South China Sea and the East China Sea, which are major conflict areas.", the second, "Therefore, the patterns of disputes in the South China Sea and the East China Sea also show a difference." In order to examine this, I will classify Chinese gray zone strategy mechanisms multi-dimensionally in large order, 1) conflict trends and frequency of strategy execution, 2) types and strengths of strategy, 3) actors of strategy execution, and 4) response methods of counterparts. So, I tried to collect data related to this based on quantitative modeling to test these. After that, about 10 years of data pertaining to this topic were processed, and a research model was designed with a new categorization and operational definition of gray zone strategies. Based on this, I was able to successfully test all the hypotheses by successfully comparing the comprehensive mechanisms of the gray zone strategy used by China and the conflict patterns between the South China Sea and the East China Sea. In the conclusion, the verified results were rementioned with emphasizing the need to overcome the security vulnerabilities in East Asia that could be caused by China's marine gray zone strategy. This study, which has never been attempted so far, is of great significance in that it clarified the intrinsic structure in which China's gray zone strategy was implemented using empirical case studies, and the correlation between this and maritime conflict patterns was investigated.

• The Korean Journal of Air & Space Law and Policy
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• v.30 no.1
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• pp.245-271
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• 2015

The downing of the MH17 reminds the world that the international civil aviation is not as safety and security as people expected. Such tragedy is partly due to the risk and danger of the armed conflict zones, but is more attributed to the ignorance to the international law by the responsible parties concerned. International laws applicable to the armed conflict zones shall be strictly followed, and the reparation shall be provided to the victims, otherwise such disaster could not be avoided in the future.

• 한국항공운항학회:학술대회논문집
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• 2016.05a
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• pp.221-224
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• 2016

2014.7.17. 암스테르담의 스키폴공항을 출발하여 쿠알라룸푸르공항으로 향하던 말레이시아항공 B777 항공기가 우크라이나의 도네츠크(Donetsk) 동쪽 약 60킬로미터 지점 상공에서 추락한 사고에 관련하여 ICAO가 유사사고를 방지하기 위한 노력의 일환으로 인터넷 웹에 기반을 둔 분쟁지역 운항위험정보 공유시스템(Conflict Zone Information Repository)을 개발하여 2015.4.2.부터 운영하고 있으나, 이 시스템에 현재까지 수록된 12개국의 42개 운항위험정보 중 10개에 대하여 당사국(운항위험 존재국)이 반대하는 것으로 나타나고 있어 이 시스템을 이용하는 국가들의 판단에 혼란이 생길 수 있는 것으로 분석되었으며, 이 문제 해소를 위해서는 ICAO가 국가들 간에 운항안전에 대한 관념의 차이가 발생하지 않도록 모든 국가들이 공감할 수 있는 판단기준을 수립하거나 또는 다른 적절한 대책을 수립할 필요가 있다.

• Korean small business review
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• v.43 no.4
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• pp.155-172
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• 2021

This research means that it analyzed the conflict structure of key stakeholders in the operation and management of the Regulation Free Zone. The analysis results are as follows. First, for the safety review related to the amendment of the law, the process of presenting a preliminary review opinion is additionally required. Second, institutional improvement is needed for the complicated preliminary preparation stage in the management system issue. Third, there is the issue of whether to provide an incentive structure to the local innovation ecosystem or to leave it to the autonomy of the participating companies and guarantee the choice in the post-management issue. In the future, this research suggests a method to systematically prepare a micro-policy demand identification process through continuous monitoring using the Q method.

• Journal of Korea Water Resources Association
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• v.56 no.5
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• pp.357-362
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• 2023

The conflict between upstream and downstream regions is a representative social conflict in Korea. It is important issues in the economic and environmental aspects related to interests of property rights and water quality conservation. however, it is insufficient for studies on the economic damage and benefits between upstream and downstream by policy. We studied validity for drinking water protect zone, one of the major water conflict in Korea, by comparison between social loss by property rights restriction in the upstream and social benefits in the downstream and we proposed integrated water management policy in basin level.

• Maritime Security
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• v.1 no.1
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• pp.149-173
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• 2020

While the United States and other Western states are in trouble with COVID-19 crisis, China is continuing its aggressive ocean expansion with its Gray-zone strategy. The Gray-zone strategy, which China uses around the South China Sea, refers to a strategy that promotes a change in international politics by creating an unclear state, neither war or peace. China, which is trying to expand its influence across East Asia, will also try to project a Gray zone strategy on the Korean Peninsula. The possible scenarios are as follows: 1) South Korea is accidentally involved in a dispute in the South China Sea, 2) Military conflicts between South Korea and China is caused by illegal fishing of Chinese boats in Yellow Sea, 3) China tries to interfere with Socotra Rock, 4) Unlikely, but possible in the future that China induce the military conflicts between Korea and Japan on the Dokdo issue. In order to cope with these scenarios, Korea should prepare the following measures from a long-term perspective: the creation of an Asian maritime safety fleet, the integ rated operation of the navy and the coast guard in the framework of the national fleet, and strengthening the conflict control system for China's provocations.

• Journal of the Korean association of regional geographers
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• v.7 no.4
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• pp.146-164
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• 2001

The purpose of this paper is to outline a research agenda for the evaluation of the sustainability of freshwater policies, especially as they relate to large cities in the Asia-Pacific region, and to co-work a comparative study on the cases of Seoul and Sydney on the basis of the research agenda. The overall long-tenn aim of the present research is to develop a framework for sustainable urban freshwater policy in the Asia-Pacific region. The nature of freshwater policies for a sample of 16 large cities in the Asia-Pacific region will be critically evaluated for 5 years in the future. For the purposes of this research agenda, four main types of urban water conflict have been evaluated - jurisdictional conflicts, conflicts related to accessibility, sectoral conflicts and environmental conflicts. Of course, in reality, aspects of these four types of conflict invariably overlap. In the case study, the environmental conflict over fresh water of Seoul can be seen as a jurisdictional, sectoral and accessibility-related conflict between the central government and Seoul local government which want to regulate the lan-use with the water conservation zone around the Paldang Dam located at a upstream of the Han River on the hand, and the Yangpyong local governmant and its population within the conservation zone which have struggled against such a regulation, on the other. In the case study on the Sydeny water crisis in 1998, the environmental conflict over fresh water of Sydney in Australia can be seen as a jurisdictional conflict between the State government and the Sydney local government and the corporatized Sydney Water which have been responsible to supply fresh water on the one hand, and the Sydney population who have been suffered from the contaminated water, on the other. Over the past ten years, both globally and in the Asia-Pacific region, including in S. Korea and Australia, the concept of sustainable development has taken on a growing role in the determination of environmental policy. The balance for sustainable policy would be between the requirement to augment water supply to cope with projected future demands and the need to improve efficiency of water use.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.3
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• pp.487-496
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• 2018

In route selection process of NIMBY facilities, many conflicts occur due to route selection procedure and NIMBY syndrome. Especially, the social conflicts surrounding the site selection and operation are frequent enough to account for 70% of the total conflict cases, causing significant losses. To resolve the conflict in route selection, social conflicts are considered. Therefore, this study proposes an improved process of selecting route considering social conflicts in the power transmission line. First, the analysis of previous research trends and interviews with experts revealed the improved exclusion zone criteria, the factors and priorities of NIMBY facilities. After selecting the candidate routes, the optimal route is selected by using Fuzzy-TOPSIS. Hence, 83.3% of six experts have verified that this model minimizes conflicts and has sufficient applicability. The proposed model is expected to be used as a tool to minimize social conflict in the selection process of the power transmission line in the early stage of the project.