• Spatial Information Research
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• v.23 no.6
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• pp.31-41
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• 2015

This research is primarily intended to explore a novel way to monitor desiccation of inland wetland by combining MNDWI (Modified Normalized Difference Water Index) and NDVI (Normalized Difference Vegetation Index). The changes for vegetation and water condition on Upo Wetland located at southeastern Korea were investigated by MNDWI and NDVI derived from 2002, 2010 and 2015 Landsat data. The integrated use of MNDWI and NDVI made it possible to identify area-wide vegetation cover changes and to assess water storage changes on multi-annual time scales simultaneously. Comparing MNDWI with NDVI reveals the quantitative evidences for anthropogenic and environmental influences (such as road, building, water) causing an accelerated wetland desiccation. In fact, our monitoring approach raises critical issues regarding the hydrological cycle and its inter-annual changes for inland wetland under threat of drying up and highlights the important role of MNDWI and NDVI integration for any urgent or long-term treatment plan. This research presents scientific and objective evidences to support integrated approach of NDVI and MNDWI in exploring drying up trends of wetlands.

• Proceedings of the Korea Water Resources Association Conference
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• 2023.05a
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• pp.199-199
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• 2023

최근 기후변화의 영향으로 가뭄, 홍수 등 재해의 발생 빈도 및 강도가 증가하고 있다. 미래에는 온실가스 배출량의 증가로 극한 기상현상은 더욱 심화될 전망이다. 이러한 위험에 효율적으로 대비하기 위해 기후변화 시나리오를 고려하여 미래를 전망하는 것은 매우 중요하며, 최근 연구자들은 불확실성을 고려하기 위해 다양한 시나리오를 적용하고 있는 추세이다. 다만, 기후변화 시나리오를 입력자료로 하여 분석을 수행하는 경우, 새로운 기후변화 시나리오가 생성될 때 기존 기후변화 영향 평가는 무의미해지며, 기존 결과의 신뢰도 또한 감소하게 된다. 지금까지 사용된 시나리오 기반 접근법의 한계를 보완하여 시나리오 중립(Scenario Neutral, SN) 접근법이 개발되었고, 이는 다양한 기후변화 시나리오에 대한 시스템의 반응을 평가하는데 유용하다. 본 연구에서는 시나리오 중립 접근법을 활용하여 가뭄 위험도를 분석하였으며, 이를 위해 금강 유역 내 용담댐 유역을 대상으로 분석을 수행하였다. 입력자료로는 용담댐 유역의 1966~2020년 일단위 강수량 자료를 사용하였고, 문헌 조사를 통해 미래 기후변화에 따른 강수량 변화 추이를 파악하였다. 연평균 강수량의 증가와 여름 강수량의 증가를 기준으로 삼아 증가 비율에 따른 노출 공간을 생성했으며, 목표 변화에 따른 교란된 시계열을 도출해냈다. 이후, 각각의 시계열에 대한 이변량 가뭄빈도분석을 수행하여 재현기간을 산정한 뒤, 목표 변화에 따른 위험도를 비교하였다. 그 결과, 연평균 강수량과 여름 강수량이 현재와 유사한 경우 100년 빈도 가뭄이 발생할 확률은 0.84, 연평균 강수량의 증가가 110%, 여름 강수량의 증가가 115%일 경우 100년 빈도 가뭄이 발생할 확률은 0.79이었다. 추후 실제 미래 기후변화 시나리오를 적용하여 기준치에 따른 만족도를 분석한다면, 가뭄 대응에 유용한 의사결정 도구로 활용될 수 있을 것이다.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.733-738
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• 2008

Serial Music, introduced by A. Sch nberg, is a one of the important composition techniques. This music style has features of pantonality and atonality, so it generates unique atmosphere of modern music. In this paper, we introduce an method of generating serial music using mathematical algorithm. This method generates music that satisfy the requirement that the number of pitches belonged to each pitch class are exactly same, though the requirement is less strict than Sch nberg's definition. To do this, our method uses space-filling curves traversing the twelve tone matrix, which is constructed by the serial series, its inversion and its transpose. Using these curves, we can generate a music that has all notes in the matrix exactly once and adequate repeatness because of the curve's locality. Result music, therefore, can be more suitable for people that are not familiar with modern music, while maintaining the features of pantonality and atonality. This paper also introduces a method of generating extended serial music that uses serialism of duration and dynamic of notes, using multi-dimensional space-filling curves.

• Journal of the Korean Institute of Landscape Architecture
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• v.38 no.2
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• pp.119-129
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• 2010

This study concerns the design strategy for the waterside of Gyeong-In Ara Waterway, Korea’s first constructed canal. This design focused on the creation of a new paradigm for waterway landscapes the major factors of which were geographical advantage, value of landscape and efficient approach. As the major space plan for the waterfront formed through the Gyeong-In Ara waterway from the Yellow Sea to the Han River, eight good views of the waterfront zone were designed by utilizing the waterway as a scenery viewpoint and, by constructing two traffic lanes for the scenic parkway connecting Incheon and the Gimpo terminal, both a linear greenway as well as various waterfront facilities were also designed. A boardwalk and bike path connecting the major theme parks were planned, and a waterfront pocket park was then organized based on the bike path. In this study, the result of the new waterfront result from the Gyeong-In Ara waterway was planned to have an identity as a new waterside culture space in order to achieve multiple functions including environmental, cultural, leisure, and tourism as well as management programs based on a variety of applied culture content and story-telling.

• Journal of Korea Multimedia Society
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• v.6 no.3
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• pp.384-396
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• 2003

Hybrid query processing method is used for preventing server overload that is created by heavy user connection in Web GIS. In Hybrid query processing method, both server and client participate in spatial query processing. But, Hybrid query processing method is restricted in scalability of server and it can't be fundamentally solution for server overload. So, it is necessary for Web GIS to be brought in web clustering technique. In this thesis, we propose load-balancing method that uses proximity of query region. In this paper, we create tile groups that have relation each tile in same group is very close, and forward client request to the server that can have maximum rate of buffer reuse with considering characteristic of spatial query. With out load balancing method, buffet in server is optimized for exploring spatial index tree and increase rate of buffer reuse, so it can be reduced amount of disk access and increase system performance.

• Journal of Korea Spatial Information System Society
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• v.2 no.1 s.3
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• pp.5-16
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• 2000

OGC(Open GIS Consortium) suggests the 'OpenGIS Simple Feature Specification for CORBA' which is the OpenGIS implementation specification for CORBA to specify standard interfaces for reuse and interoperation among distributed heterogeneous GIS resources in the CORBA distributed computing environment. An OpenGIS server that supports this implementation specification moat correctly implement all interfaces defined in the OpenGIS implementation specification to be interoperable with wrapped GISs efficiently. In this paper, we have designed and implemented an OpenGIS server based an object relational GIS, called GEUS that integrates GIS and database technologies to provide spatial data types and spatial operators from the DBMS engine level. In the CORBA distributed computing environment, clients can access geospatial data stored in GIS wrapped by the OpenGIS server through the standard interfaces defined in the OpenGIS implementation specification for CORBA. In addition, clients can use geospatial operation features provided by a back-end GIS and interoperate with other GISs.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.27 no.2
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• pp.201-212
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• 2017

As services using mobile devices increase, exposure of personal information, and secure threats increase. In this paper, we propose a location-based user authentication system used in mobile device for tightening security. Our authentication system is performed to authenticate two steps. The first authentication is location authentication to ensure that the user accesses an application in trustable space. This authentication method uses an Access Point's information. The second authentication is trustable space authentication to confirm the normal user. This method is carried out the authentication by using biometric information from the user.

• Journal of the Korean housing association
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• v.21 no.4
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• pp.1-9
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• 2010

Since the active enhancement of large-scale apartment development in 1970, apartment complexes in Korea have shown considerable changes throughout, with respect to its planning and design. Depending on the government legislations, and economical and social issues of its time, apartments have been designed to respond to varying demands of the society; from minimal unit design to overall masterplan. As existing researches regarding development of apartment planning are conducted in individual and distinct manner, not only is it difficult to find cases of an overall critical analysis of apartment complexes, it is also rare to look for research that deals with a greater urban context, nor the geographical location of the site. With specific focus on apartments in the metropolitan, the focus of this research lies in critically analyzing the qualities of outdoor spaces within an apartment complex, its generational change and interpreting the value it holds for the society. With regards to analyzing its outdoor features, the core of this study deals with applying space syntax, based on the configurational properties of spatial constituents. The results of this research have some implications that the accessibility change of apartment outdoor spaces was examined through quantitative analysis, and the changes of it by time were clarified in detail. And objective and quantitative approaches were employed for an alternative to the methods used in existing related researches.

• Journal of the Economic Geographical Society of Korea
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• v.5 no.1
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• pp.105-119
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• 2002

The purpose of the study is to examine the characteristic of recreation forest that has been rapidly developed and increased since late 1980's. Also, the process and spatial distribution of recreation forest is analyzed. For the analyses of the characteristic of recreation forest, the concept of recreation forest that has been researched and published is explored and examined. To explain the process and spatial distribution, recreation forest used by people at present is studied in terms of time and space. It is concluded that the characteristic of recreation forest serve as nature oriented forest as well as functions as recreational space and educational place on nature. The recreation forest also produces wood far economic purpose and gives owners economic benefit. Also the study leads us to the conclusion that the process of recreation forest is related to changes in leisure activity caused by shorter working hours and tourist behavior. Finally, from this study, we can conclude that natural and social conditions have an effect on spatial distribution as an important variable.

• The Journal of the Korea Contents Association
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• v.21 no.11
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• pp.193-202
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• 2021

Barrier-free is defined as inclusive design of built environments such as building and its facilities that can be approached, entered and used by persons with disabilities. The purpose of this paper develops the content that can identify the physical barriers in the way of movement and provide information associated with barrier-free by using both Geospatial Information and Virtual Reality technology. For this, we conducted literature reviews to find the tackling barriers in terms of barrier-free access and extracted main functions to construct the content. Then, the prototype model which composed of VR engine and 3D geospatial data was implemented, and finally the utilization of the prototype was checked in accordance with barrier-free scenario. The developed prototype model of this study would be contributed to design the barrier-free of public places and access to public buildings for the mobility-disabled people.