2013 Feb IK Bulletin
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Optimal Rescue Ship Locations Using Image Processing and Clustering
S S symmetry Article Optimal Rescue Ship Locations Using Image Processing and Clustering Cho-Young Jung 1 and Sang-Lok Yoo 2,* 1 Department of Marine Science and Production, Kunsan National University, Gunsan 54150, Jeonbuk, Korea; [email protected] 2 Mokpo Maritime University, Mokpo 58628, Jeonnam, Korea * Correspondence: [email protected]; Tel.: +82-61-240-7175 Received: 15 October 2018; Accepted: 11 December 2018; Published: 2 January 2019 Abstract: Currently, globalization of the world economy has also resulted in a shipping volume increase. However, this growth in maritime traffic has led to increased risk of marine accidents. These accidents have a higher probability of occurring in regions where geographical features such as islands are present. Further, the positioning of rescue ships in a particular ocean region with a high level of maritime activity is critical for rescue operations. This paper proposes a method for determining an optimal set of locations for stationing rescue ships in an ocean region with numerous accident sites, such as in the Wando islands of South Korea. The computational challenge in this problem is identified as the positioning of numerous islands of varying sizes located in the region. Thus, the proposed method combines a clustering-based optimization method and an image processing approach that incorporates flood filling to calculate the shortest pixel value between two points in the ocean that detours around the islands. Experimental results indicate that the proposed method reduces the distance between rescue ships and each accident site by 5.0 km compared to the original rescue ship locations. Thus, rescue time is reduced. -
Spatial Variations in Fertility of South Korea: a Geographically Weighted Regression Approach
International Journal of Geo-Information Article Spatial Variations in Fertility of South Korea: A Geographically Weighted Regression Approach Myunggu Jung 1 , Woorim Ko 2, Yeohee Choi 3 and Youngtae Cho 2,* 1 Department of Population Health, London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK; [email protected] 2 Department of Public Health Science, Graduate School of Public Health, Seoul National University, Seoul 08826, Korea; [email protected] 3 Department of Social Welfare, Graduate School of Social Welfare, Ewha Womans University, Seoul 03760, Korea; [email protected] * Correspondence: [email protected]; Tel.: +82-2-880-2820 Received: 5 May 2019; Accepted: 4 June 2019; Published: 5 June 2019 Abstract: South Korea has witnessed a remarkable decline in birth rates in the last few decades. Although there has been a large volume of literature exploring the determinants of low fertility in South Korea, studies on spatial variations in fertility are scarce. This study compares the Ordinary Least Squares (OLS) and Geographically Weighted Regression (GWR) models to investigate the potential role of the spatially heterogeneous response of the total fertility rate (TFR) to sociodemographic factors. The study finds that the relationships between sociodemographic factors and TFRs in South Korea vary across 252 sub-administrative areas in terms of both magnitude and direction. This study therefore demonstrates the value of using spatial analysis for providing evidence-based local-population policy options in pursuit of a fertility rebound in South Korea. Keywords: low fertility; spatial analysis; GIS; regional fertility differentials; total fertility rate 1. Introduction In the last few decades, South Korea has witnessed a remarkable decline in birth rates. -
Ipv6 Deployment Experience Sharing and Current Strategy in Korea
___________________________________________________________________________ 2010/TEL41/DSG/WKSP2/010 Agenda Item: Panel Discussion 2 IPv6 Deployment Experience Sharing and Current Strategy in Korea Submitted by: Korea Workshop for IPv6: Transforming the Internet Chinese Taipei 8 May 2010 2010. 5. 8 APEC TEL41 IPv6 Workshop Inhye Kim IP policy & management team Korea Internet & Security Agency Contents 11 CurrentCurrent IPv6IPv6 StatusStatus inin KoreaKorea 22 ExperienceExperience SharingSharing 33 CurrentCurrent StrategyStrategy inin 20102010 1. Current IPv6 Status in Korea [Info.]A brief history of IPv6 in Korea ‘IPv6 Promotion plan I’ was announced 2003~ 2003~ ‘IPv6 strategy council (chairman: Minister)’ was established Phase1 R&D 2006.92006.9 IPv6 requirement was contained as one of provisions in EA law 2004~20072004~2007 KOREAv6 Trial Service (25 projects ) Korea government has invested about $26M for IPv6 R&D project since 2000 By reformation of government, Korea Communications Commission 2008.32008.3 (KCC) was key player for IPv6 promotion Phase2 Imple- KCC support 16 local governments and research institutions to mentat 20082008 build IPv6/IPv4 backbone network. -ion ISP’s backbone network will have been changing IPv4/IPv6 ready 20092009 network by 2011 Now, Korea have 5,202 blocks of /32 IPv6 address. Ranked 3th in Asian-Pacific area Current IPv6 status in Korea • Collaboration system – In 2009, to collaborate among stakeholders, ‘IPv6 Promotion council’ was established with ISPs, KCC(Korea Communication Commission), and several government departments. • Mainly focused on increasing a IPv6 readiness of network infrastructure. • Private & Public sector – Major ISPs now concerned IPv4/IPv6 dual stack product requirement mandatory. – In 2006, government conducted procurement policy regarding to IPv6-aware product. -
Development of the Korean Climate Change Vulnerability Assessment Tool (VESTAP) —Centered on Health Vulnerability to Heat Waves
Article Development of the Korean Climate Change Vulnerability Assessment Tool (VESTAP) —Centered on Health Vulnerability to Heat Waves Kwan-Young Oh 1, Moung-Jin Lee 1,* and Seong-Woo Jeon 2,* 1 Center for Environmental Assessment Monitoring, Korea Environment Institute (KEI); 370 Sicheong-daero, Sejong 30147, Korea; [email protected] 2 Divison of Environmental Science & Ecological Engineering, Korea University, 145 Anam-ro, Seongbuk- gu, Seoul 02841, Korea * Correspondence: [email protected] (M.-J.L.); [email protected] (S.-W.J.); Tel.: +82-44-415-7314 (M.-J.L.); +82-2-3290-3043 (S.-W.J.) Received: 2 May 2017; Accepted: 19 June 2017; Published: 24 June 2017 Abstract: The purpose of this study was to develop a Korean climate change vulnerability assessment tool, the Vulnerability Assessment Tool to build Climate Change Adaptation Plan (VESTAP). Based on Intergovernmental Panel on Climate Change methodology, VESTAP can be used to evaluate Korea’s vulnerability to major climate impacts (including 32 conditions in 8 categories). VESTAP is based on RCP 4.5/8.5 scenarios and can provide evaluation results in 10-year intervals from the 2010s to 2040s. In addition, this paper presents the results of a case study using VESTAP for targeted assessment of health vulnerability to heat waves under the RCP 8.5 scenario for the 2040s. Through vulnerability assessment at the province level in South Korea, Daegu Metropolitan City was identified as the most vulnerable region. The municipality and submunicipality levels of Daegu were also assessed in separate stages. The results indicated that Pyeongni 3-Dong in Seo-Gu was most vulnerable. -