• 농촌계획
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• 제16권4호
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• pp.53-60
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• 2010

This study aims at suggesting the attributes and limitations of each methods through the evaluation of the verified analysis results, so that it will be possible to select an efficient method that may be applied to assess the green coverage ratio. Green coverage areas of each sites subject to this study were assessed utilizing the following four methods. First, assessment of green coverage area through direct planimetry of satellite images. Second, assessment of green coverage area using land cover map. Third, assessment of green coverage area utilizing the band value in satellite images. Forth, assessment of green coverage area using and land cover map and reference materials. For this study, four urban zones of the City of Seosan in Chungcheongnam-do. As a result, this study show that the best calculation method is the one that combines the merits of first and second methods. This method is expected to be suitable for application in research sites of middle size and above. It is also deemed that it will be possible to apply this method in researches of wide area, such as setting up master plans for parks and green zones established by each local self-government organizations.

• 한국정밀공학회지
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• 제26권7호
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• pp.73-80
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• 2009

This paper describes a path planning algorithm, which is the minimal turning path based on the shape and size of the cell to clean up the whole area with two cleaning robots. Our method divides the whole cleaning area with each cell by cellular decomposition, and then provides some path plans among of the robots to reduce the rate of energy consumption and cleaning time of it. In addition we suggest how to plan between the robots especially when they are cleaning in the same cell. Finally simulation results demonstrate the effectiveness of the algorithm in an unknown area with multiple robots. And then we compare the performance index of two algorithms such as total of turn, total of time.

• 대한방사선치료학회지
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• 제31권2호
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• pp.33-41
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• 2019

목 적: 용적변조회전 방사선치료(Volumetric Modulated Arc Therapy, VMAT)시, Planning Target Volume(PTV)을 중복 설정하여 손상위험장기(Organ At Risk, OAR)에 인접한 PTV Coverage 감소를 개선하기 위한 연구이다. 대상 및 방법: 본원에서 전뇌(Whole Brain), 담낭(Gall Bladder), 직장(Rectum) 방사선치료를 받은 환자를 대상으로 하였으며, PTV 내 Coverage가 부족한 부분에 PTV를 중복 적용한 치료계획과 적용하지 않은 치료계획으로 구성하여 Coverage 변화와 최대선량, 선량균질지수(Homogeneity Index, H.I.), 처방선량지수(Conformity Index, C.I.)를 비교하였으며, 손상위험장기(Organ At Risk, OAR)의 최대선량과 평균선량의 변화 또한 비교하였다. 결 과: 중복하여 적용한 PTV의 Coverage는 모든 환자에게서 증가하였고, 이에 따른 영향으로 전체 Coverage 또한 4명의 환자에게서 증가하였다. PTV의 최대선량은 5명의 환자에게서 증가하였으며, 모든 환자의 선량균질지수와 처방선량지수는 큰 차이를 나타내지 않았다. 수정체의 최대선량은 최대 1.12배 증가하였으나, 뇌줄기의 경우 2명의 환자에게서 최대선량이 감소하였다. 안구의 평균선량은 최대 1.15배 증가하였으며, 양측 이하선의 경우 큰 차이를 나타내지 않았다. 담낭암 환자의 경우 간과 결장의 평균선량은 각각 0.95배, 0.94배 감소하였으며, 십이지장의 평균선량은 큰 차이가 없었다. 직장암 환자의 경우 OAR로 설정한 양측 대퇴골두와 방광 모두 평균선량은 감소하였으며, 전체 MU는 1명을 제외한 4명의 환자에게서 비슷한 수준으로 나타났다. 결 론: OAR의 선량제한을 고려해가면서 적절하게 사용한다면, PTV의 Coverage 개선에 유용한 방법이라 생각한다.

• 대한예방한의학회지
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• 제21권3호
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• pp.29-42
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• 2017

Background : Efforts towards increasing insurance coverage for traditional Korean medicine (TKM) are being continued. However, various difficulties are faced in generating evidence for TKM due to limited financial support and the low quality of research methodology. Objectives : The objectives of this study were to review the Swiss evaluation program for complementary and alternative medicine (CAM) and assess the expansion in public health insurance coverage of complementary medicine as approved by referendum in Switzerland. Methods : The regulations of CAM in the European Union were assessed. Research articles, reports, government publications and websites which deal with the 'Programm Evaluation $Komplement{\ddot{a}}rmedizin$ (PEK)' and the referendum in Switzerland were searched for and analyzed. Results : The PEK was conducted from 1998 to 2005. The PEK evaluated the efficacy, utilization and cost-effectiveness of anthroposophical medicine, homeopathy, neural therapy, phytotherapy and traditional Chinese medicine. However, clear conclusions could not be drawn from the evaluation according to the PEK Report. Later, a referendum was implemented in which 5 therapies would be added to the Switzerland Constitution with the support of the public. The coverage of CAM was approved by Swiss a plebiscite with an approval rate of 67.0%. Conclusions : The reason for the successful referendum is suggested to be public support and the solidarity with CAM experts and politicians. It may be surmised that recognition of the political efforts and scientific aspects required to expand insurance coverage of TKM, and towards obtaining public support, is necessary.

• 한국태양에너지학회 논문집
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• 제29권3호
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• pp.19-27
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• 2009

In this study, Urban Climate Simulation was performed by 3-Dimensional Urban Canopy Model. The characteristics of urban climate were analyzed combining artificial land coverage, building size, heat production from the air conditioning and topographic conditions as physical variables which affects urban climate characteristics. The results are as follows. (1) The aspects of the urban climatal change is derived to be related to the combination of the building coverage ratio, building height and shading area. According to the building height, the highest temperature was increased by $2.1^{\circ}C$ from 2-story to 5-story building and the absolute humidity by 2.1g/kg maximum and the wind velocity by 1.0m/s was decreased from 2-story to 20-story building. (2) Whole heat generation was influenced by the convective sensible heat at the lower building height and by the artificial heat generation at the higher one over 20-story building influence to some extent of the building coverage ratio. The effect of the altitude is not more considerable than the other variables as below $1^{\circ}C$ of the air temperature. In the last, deriving the combination of building coverage and building height is needed to obtain effectiveness of the urban built environment planning at the point of the urban climate. These simulation results need to be constructed as DB which shows urban quantitative thermal characters by the urban physical structure. These can be quantitative base for suggesting combinations of the building and urban planning features at the point of the desirable urban thermal environment as well as analyzing urban climate phenomenon.

• Radiation Oncology Journal
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• 제34권4호
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• pp.313-321
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• 2016

Purpose: Total scalp irradiation (TSI) is a rare but challenging indication. We previously reported that non-coplanar intensity-modulated radiotherapy (IMRT) was superior to coplanar IMRT in organ-at-risk (OAR) protection and target dose distribution. This consecutive treatment planning study compared IMRT with volumetric-modulated arc therapy (VMAT). Materials and Methods: A retrospective treatment plan databank search was performed and 5 patient cases were randomly selected. Cranial imaging was restored from the initial planning computed tomography (CT) and target volumes and OAR were redelineated. For each patients, three treatment plans were calculated (coplanar/non-coplanar IMRT, VMAT; prescribed dose 50 Gy, single dose 2 Gy). Conformity, homogeneity and dose volume histograms were used for plan. Results: VMAT featured the lowest monitor units and the sharpest dose gradient (1.6 Gy/mm). Planning target volume (PTV) coverage and homogeneity was better in VMAT (coverage, 0.95; homogeneity index [HI], 0.118) compared to IMRT (coverage, 0.94; HI, 0.119) but coplanar IMRT produced the most conformal plans (conformity index [CI], 0.43). Minimum PTV dose range was 66.8%-88.4% in coplanar, 77.5%-88.2% in non-coplanar IMRT and 82.8%-90.3% in VMAT. Mean dose to the brain, brain stem, optic system (maximum dose) and lenses were 18.6, 13.2, 9.1, and 5.2 Gy for VMAT, 21.9, 13.4, 14.5, and 6.3 Gy for non-coplanar and 22.8, 16.5, 11.5, and 5.9 Gy for coplanar IMRT. Maximum optic chiasm dose was 7.7, 8.4, and 11.1 Gy (non-coplanar IMRT, VMAT, and coplanar IMRT). Conclusion: Target coverage, homogeneity and OAR protection, was slightly superior in VMAT plans which also produced the sharpest dose gradient towards healthy tissue.

• Asian Pacific Journal of Cancer Prevention
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• 제15권17호
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• pp.7401-7405
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• 2014

Background: Postoperative chemoradiotherapy is accepted as standard treatment for stage IB-IV, M0 gastric cancer. Radiotherapy (RT) planning of gastric cancer is important because of the low radiation tolerance of surrounding critical organs. The purpose of this study was to compare the dosimetric aspects of 2-dimensional (2D) and 3-dimensional (3D) treatment plans, with the twin aims of evaluating the adequacy of 2D planning fields on coverage of planning target volume (PTV) and 3D conformal plans for both covering PTV and reducing the normal tissue doses. Materials and Methods: Thirty-six patients with stage II-IV gastric adenocarcinoma were treated with adjuvant chemoradiotherapy using 3DRT. For each patient, a second 2D treatment plan was generated. The two techniques were compared for target volume coverage and dose to normal tissues using dose volume histogram (DVH) analysis. Results: 3DRT provides more adequate coverage of the target volume. Comparative DVHs for the left kidney and spinal cord demonstrate lower radiation doses with the 3D technique. Conclusions: 3DRT produced better dose distributions and reduced radiation doses to left kidney and spinal cord compared to the 2D technique. For this reason it can be predicted that 3DRT will result in better tumor control and less normal tissue complications.

• 한국통신학회논문지
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• 제25권10A호
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• pp.1461-1472
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• 2000

이동 통신 가입자의 수가 폭발적으로 증가하는 상황에서 좋은 품질을 갖는 서비스를 제공하기 위해서는 새로운 Cell Planning 기법이 필요하다. 따라서 차세대 이동통신 시스템인 IMT-2000 망에서 적절한 Cell Planning 기법을 이용하여 계층 셀 구조를 구성하여만 정상적인 IMT-2000 서비스 제공이 가능할 것이다. 본 논문에서는 향후 서비스 될 제 3세대 이동통신 시스템인 IMT-2000(3GPP)의 권고안을 분석하여 셀 설계에 필요한 여러 파라미터를 살펴본다. 또한 IMT-2000 무선링크 분석을 위한 모델을 설정하고 수직적으로 유도함으로써 순방향과 역방향 링크 버짓, 시스템의 용량, Call Blocking 확률, Erlang Capacity, 셀 커버리지를 분석한다. 분석을 수행하는데 있어서 계층 셀의 구조와 사용자 수, 서비스의 종류, 지역 등 여러 가지 환경의 변화에 따른 설계의 방향을 제시하였다. 본 논문을 통해 IMT-2000 상용화 시 효율적인 Cell Planning 기법 제시 및 용량 극대화를 이룰 수 있을 것이다.

• 한국의학물리학회지:의학물리
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• 제21권4호
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• pp.354-359
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• 2010

뇌하수체 종양의 치료 계획 시 다양한 영상 융합 프로토콜이 실제 PTV (planning target volume) coverage 및 OAR (organ at risk) 보호에 미치는 선량학적 영향을 확인하고자 하였다. 선량 체적 히스토그램(DVH, dose volume histogram)을 이용하여 각 프로토콜 별 실제 PTV의 coverage 및 그 변화 그리고 시각경로(optic pathway) 및 뇌간(brainstem)의 최대 흡수 선량과 임계 선량을 초과한 체적을 획득하였고 축상면(axial plane)과 관상면(coronal) 영상을 함께 사용하여 S-I (superior-inferior) 방향의 불확정도를 보정한 영상 융합 프로토콜이 축상면 만을 이용한 경우보다 시각경로 및 뇌간의 최대 흡수 선량과 임계 선량을 초과한 체적 모두 감소된 수치를 보임을 확인 하였다. 본 case에 한해 축상면 그리고 관상면 영상을 함께 사용하는 것이 OARs 보호에 가중치를 둔 방사선 수술 치료 계획 수립에 도움을 줄 수 있다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1099-1101
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• 2003

Change detection technology, which discovers the change information on the surface of the earth by comparing and analyzing multi-temporal satellite images, can be usefully applied to the various fields, such as environmental inspection, urban planning, forest policy, updating of geographical information and the military usage. In this paper, we introduce a change detection system that can extract and analyze change elements from high-resolution satellite imagery as well as low- or middle-resolution satellite imagery. The developed system provides not only 7 pixelbased methods that can be used to detect change from low- or middle-resolution satellite images but also a float window concept that can be used in manual change detection from highresolution satellite images. This system enables fast access to the very large image, because it is constituted by OGC grid coverage components. Also new change detection algorithms can be easily added into this system if once they are made into grid coverage components.