• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.298-301
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• 2011

Edge detection is an base research task in the field of image processing. Edge detection can be regarded as a technique for locating pixels of abrupt gray-level change. So with Gradient method, it can be computed easily. But it can't satisfy human naked eye. so in this paper, new algorithm based on the NLM(Non Local Means) is proposed for good performance for human naked eye.

• Journal of KIISE:Computing Practices and Letters
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• v.8 no.6
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• pp.778-786
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• 2002

Scene boundary detection is important in the understanding of semantic structure from video data. However, it is more difficult than shot change detection because scene boundary detection needs to understand semantics in video data well. In this paper, we propose a new approach to scene segmentation using contextual information in video data. The contextual information is divided into two categories: local and global contextual information. The local contextual information refers to the foreground regions' information, background and shot activity. The global contextual information refers to the video shot's environment or its relationship with other video shots. Coherence, interaction and the tempo of video shots are computed as global contextual information. Using the proposed contextual information, we detect scene boundaries. Our proposed approach consists of three consecutive steps: linking, verification, and adjusting. We experimented the proposed approach using TV dramas and movies. The detection accuracy of correct scene boundaries is over than 80%.

• Journal of the Korean Association of Geographic Information Studies
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• v.20 no.4
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• pp.15-23
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• 2017

The WGS conversion project of cadastral drawing (promoted by the Ministry of Land) is not able to reflect the cadastral registration due to subtle differences such as area and location. When converting the digital cadastral region to the world geodetic system, the boundary point coordinates must be changed to the legal coordinate units. However, there is a phenomenon that occurs in which the minute area changes do not coincide with the area registered in the cadastral registration when the coordinate unit is changed. In this study, we have developed a method to adjust many parcels collectively by applying a passive fine-tuning method used in cadastral resurvey project to solve these problems. Total 1, total 2+1, interval 1, interval 2+1, etc. were classified based on the number of parcels that need to be considered for the range of adjustment and the area condition. The analysis of the experimental area (after developing SW for comparison of each method) showed that the total 2+1 method is suitable for the location accuracy and the interval 2+1 method is suitable for the temporal efficiency.

• The Journal of the Convergence on Culture Technology
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• v.4 no.4
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• pp.361-366
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• 2018

For each character constituting learning data, different fonts are added in pixel unit to create MASK, and then pixel values belonging to the MASK are divided into three groups. The experimental data are modified into skeletal forms, and then regional boundary operation is used to create a boundary that distinguishes the background region adjacent to the skeleton of the character from the background of the modified experimental data. Discordance values between the modified experimental data and the MASKs are calculated, and then the MASK with the minimum value is found. This MASK is selected as a finally recognized result for the given experiment data. The recognition algorithm using skeleton of the character and the regional boundary operation can easily extend the learning data set by adding new fonts to the given learning data, and also it is simple to implement, and high character recognition rate can be obtained.

• Journal of the Korean Association of Geographic Information Studies
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• v.15 no.4
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• pp.42-54
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• 2012

The main purpose of this study is to suggest the spatial statistical approach suitable for the delimitation of Busan CBD. For this purpose, Getis-Ord $G_i^*$ and both of IDW (Inverse Distance Weight) and FDB(Fixed Distance Band) were applied to delimit the CBD boundary. And then, the results of the CBD boundary were compared and verified with the methodologies of the previous studies. The result of IDW accorded with the previous study relating to the delimitation of the boundary of CBD, and the result of FDB was reflecting the characteristics of the mixed-use residential of a transition zone. As a result of the land use quotient, the mixed land use of residential and commercial was highly specialized in the boundary of FDB. These results will be able to support the understanding of urban spatial structure and the effective CBD management.

• Journal of Korean Society for Geospatial Information Science
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• v.21 no.4
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• pp.83-93
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• 2013

Land Suitability Assessment can help to evaluate whether to preserve or to develop through analysis of various land characteristics. So, the evaluation index and method are very important for making the best result. The principle objective of this dissertation is to identify effective method that can make up for the distortion of land suitability value in the forest bordering the management area. The objective area of this study is comparative flat Jeungpyeong-gun. The procedures of the study are as follows. First, implement land suitability assessment as the normal index on Guideline. Second, verify land suitability grade about the forest bordering the management area. The third, redo land suitability assessment as two alternative index on $^*$Guideline. The fourth, identify effective method between normal index and alternative index. The results of this tests show that the development suitability value is higher than preservation suitability value in the forest bordering the management area near existing development area. For that reason, this study needed to use substitution index in order to make up for the weakness. The level of land price and distance from road were main considerations. Finally, the derivative model is as follows. The derivative model confirmed the best assessment method in the forest bordering the management area near existing development area.

• Journal of the Economic Geographical Society of Korea
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• v.20 no.3
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• pp.287-306
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• 2017

Since the 1990s, political geographers have focused on the study of the process of border construction. They have shifted from the old morphological and functional approaches to boundary that have focused on the types and functions of boundaries. Recent scholarship on border studies understand boundaries and the border regions as entities with overlapping and competing relationships not as manifestation of territoriality. There has been the emphasis on the multidimensional actors and the historical and cultural legacies inherent in the border region as well. Based on these recent discussions, this study examines how the border region has been constructed by various actors and strategies in Dandong China, the border city between North Korea and China. Several sanctions including UN Security Council have been resolved and implemented in accordance with North Korea's nuclear and missile development, which is a relevant example to examine the "border as relationships" in which strategies of various actors are competing. In addition, this paper has a significance as a case study on the construction process of border and the characteristics of its materiality, which is a way to overcome the limitation of discourse-oriented critical geopolitical research.

• Journal of KIISE:Software and Applications
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• v.32 no.1
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• pp.41-49
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• 2005

In this Paper, we Propose an automatic lung registration technique using local distance propagation for correcting the difference between two temporal images by a patient's movement in abdomen CT image obtained from the same patient to be taken at different time. The proposed method is composed of three steps. First, lung boundaries of two temporal volumes are extracted, and optimal bounding volumes including a lung are initially registered. Second, 3D distance map is generated from lung boundaries in the initially taken volume data by local distance propagation. Third, two images are registered where the distance between two surfaces is minimized by selective distance measure. In the experiment, we evaluate a speed and robustness using three patients' data by comparing chamfer-matching registration. Our proposed method shows that two volumes can be registered at optimal location rapidly. and robustly using selective distance measure on locally propagated 3D distance map.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.04a
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• pp.81-84
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• 2002

제주도 동부지역 구좌읍 한동리-송당리를 연결하는 직선상의 4개 지점에서 착정한 심부관측정에 대한 시추코어 지질검층과 심도별 수온ㆍ전기전도도 검층 결과, 제주도를 형성시킨 화산활동과 관련된 화산분출물(용암류 및 쇄설물)은 해수면하 136~170m 범위까지만 분포하고 있고, 그 하부에는 미교결의 U층(U Formation)이 분포하고 있는 것으로 밝혀졌다. 구좌읍 한동리에 소재한 둔지봉(해발 280m)을 경계로 해안지역의 U층 상부에는 용암이 바다속으로 흘러갈 때 생겨나는 베개용암(Pillow Lava)이 분포하고 있음이 최초로 확인되었으며, 이 베개용암층을 통해 고염분지하수가 내륙쪽으로 확산되는 것으로 밝혀졌다. 담수지하수체 하부에 존재하는 고염분 지하수체는 해안에서 내륙쪽으로 오면서 점진적으로 감소하고 기저지하수체(담ㆍ염수 혼합대를 형성하는 지하수체)는 해안으로부터 약 6~6km(해발 120~130m)지역까지 분포하고 있으며, 담수지하수 렌즈체의 두께는 이론적인 G-H비 보다 훨씬 얇은 것으로 나타났다.

• Proceedings of the KSRS Conference
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• 2001.03a
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• pp.116-121
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• 2001

경기만 지역은 세계최대 규모의 갯벌이 조성되어 해양생태계에서 중요한 역할을 수행하는 자연의 보고이나, 강한 조류운동, 한강 유역으로부터의 토사이동, 그리고 계속되는 연안 개발등 지속적인 영향을 받고 있다. 본 연구에서는 이러한 경기만 지역의 지리적·환경적 요인에 기인한 갯벌지역의 지난 30년 동안 공간적 변화를 분석하고자 한다. 해안선·조간대 지형의 변화 특성은 1972년부터 1999년까지 약 5년 간격으로 촬영된 Landsat MSS 와 TM 영상들을 이용하여 분석하였다. MSS와 TM의 공통적인 파장대이며, 물과 조간대의 경계가 뚜렷한 근적외선 파장대를 이용하여 간조시 갯벌의 경계선을 추출하였다. 각 시기의 수면, 갯벌, 육지를 나타내는 수치지도가 제작된 후, 이들을 중첩함으로써 시기별 변화유형을 구분하였고, 변화유형을 다시 원인에 따라 인공적인 요인과 자연적인 요인으로 나누었다. 의미있는 변화 유형은 크게 8가지로 나타났으며, 변화유형과 변화요인을 연계하여 경기만 지역의 변화특성을 도출하였다.