위성영상자료를 이용한 서울시 도시녹지의 평가기법 연구: 북한산 국립공원 주연부 탐지

박종화 ( Chong Hwa Park ) 대한원격탐사학회 1995 대한원격탐사학회지 Vol.11 No.3

The purposes of this research were to find ways to detect ecotone between the Mt. Pukhansan National Park and adjacent urban residential areas, to measure the width and size of ecotone around the park, and to investigate temporal change of ecotone around the park. Normalized Difference Vegetation Index(NDVI) derived from TM data (May of 1985, 1987, and 1993) and the analytical capabilities of GIS were used to investigate the impacts of human activities inside of and outside of the bounadry of the park. Major findings of the study can be summarized as follows: First, ecotone around the boundary of the national park could be identified from NDVI-distance curves derived by a series of buffering operations with a GIS. Second, average width of ecotone around the park was nearly doubled during 1985-1993 period. Third, NDVI values of the park were about 14 percent higher than those of surrounding areas. Finally, it seems that the expansion of the ecotone of the park is related to heavy trampling of visitors and various types of environmental pollution of the adjacent urban areas.

설악산국립공원내 산양(Nemorhaedus Caudatus Raddeanus)의 잠재 서식지 적합성 모형; 다기준평가기법(MCE)과 퍼지집합(Fuzzy Set)의 도입을 통하여

최태영,박종화,Choi Tae-Young,Park Chong-Hwa 한국조경학회 2004 韓國造景學會誌 Vol.32 No.4

Korean goral (Nemorhaedus caudatus raddeanus) is one of the endangered species in Korea, and the rugged terrain of the Soraksan National Park (373㎢) is a critical habitat for the species. But the goral population is threatened by habitat fragmentation caused by roads and hiking trails. The objective of this study was to develop a potential habitat suitability model for Korean goral in the park, and the model was based on the concepts of fuzzy set theory and multi-criteria evaluation. The process of the suitability modeling could be divided into three steps. First, data for the modeling was collected by using field work and a literature survey. Collected data included 204 points of GPS data obtained through a goral trace survey and through the number of daily visitors to each hiking trail during the peak season of the park. Second, fuzzy set theory was employed for building a GIS data base related to environmental factors affecting the suitability of the goral habitat. Finally, a multiple-criteria evaluation was performed as the final step towards a goral habitat suitability model. The results of the study were as follows. First, characteristics of suitable habitats were the proximity to rock cliffs, scattered pine (Pinus densiflora) patches, ridges, the elevation of 700∼800m, and the aspect of south and southeast. Second, the habitat suitability model had a high classification accuracy of 93.9% for the analysis site, and 95.7% for the validation site at a cut off value of 0.5. Finally, 11.7% of habitatwith more than 0.5 of habitat suitability index was affected by roads and hiking trails in the park.

지리산 반달가슴곰 상사리 입지와 조망 특성

유재심 ( Jae Shim Yu ),박종화 ( Chong Hwa Park ),우동걸 ( Dong Gul Woo ) 한국환경복원기술학회 2012 한국환경복원기술학회지 Vol.15 No.4

The objective of this study is to investigate the characteristics of the location and prospects of the bear shelves built by Asiatic black bears in the Jirisan National Park. Previous researchers have been analyzed bear shelves in terms of places for resting and eating, but we are going to analyze based on the prospect-and-refuge theory. Characteristics of the sites of bear shelves are measured through field survey and topographic analysis by using digital elevation model (DEM). The normalized difference vegetation index (NDVI) is used to evaluate the optimum location of bear shelves in terms of crown density. Man-made objects are identified by viewshed analysis based on geographical information system (GIS). Findings of this paper can be summarized as follows. First, most bear trees are located deep inside of the mountainous national park, slopes of 30~40 degrees, altitude of 400~1,200m, and relatively low vegetation density with NDVI value of 0.4~0.6 compared to the average NDVI of the park. Second, the average height of bear shelves is 12.44m, or 74% of the average height of bear trees.They are located at suitable places to observe nearby trails and other park facilities. Third, man-made objects within the 100m radius of bear trees include lodge, bear training center, beekeeping camp, and hiking trails. Thus we may temporarily conclude that one of the main criteria of the bear tree selection in the park has been to identify optimum places for the monitoring of human activities in their habitat.

보호지역 경계조정을 위한 공간의사결정지원모델 연구 -지리산 국립공원을 사례로-

성혜정 ( Hye Jung Sung ),권혁수 ( Hyuk Soo Kwon ),서창완 ( Chang Wan Seo ),박종화 ( Chong Hwa Park ) 한국환경복원기술학회 2011 한국환경복원기술학회지 Vol.14 No.3

The purpose of this study are to develop a SDSS (Spatial Decision Support System) that can incorporate diverse opinions of stakeholders related the designation of protected areas (PA), and to employ the model for the readjustment of the boundary line of the Jirisan National Park of Korea. The SDSS would lead to more rational and less controversial decision-making during the expansion or removal of PA in Korea. Research methods are as follows. Firstly, to select evaluation criteria for SDSS for PA designation by using expert interview and literature survey. Secondly, to measure their preferences on the designation of additional PA or the removal of a part of PA based on the opinions of various stakeholders such as local residents, environmental groups, or public officials. Thirdly, to produce conservation priority maps based on a multi-criteria decision making technique. The SDSS would be used to rational decision making for the expansion of PA or the release of a certain part of PA by reflecting diverse preferences on biodiversity conservation and economic interest of residents. The visualization of conservation priority maps would also increase the efficiency of such decision making processes. The evaluation criteria for the expansion of PA for biodiversity conservation includes vegetation conservation value, wildlife conservation value, and the habitats of key species. The evaluation criteria for the removal of PA includes the proximity to roads and the boundary of PA, land use types, and conservation zoning of the PA. Preference weights are based on data collected from the Jirisan National Park. Both the conservation priority and removal priority maps are based on land parcels so that property rights of all parcels would be correctly represented.

OSI-분산 시스템에서의 Biba Security 모델의 구현

박종화,Park, Chong-Hwa 한국정보기술전략혁신학회 2002 情報學硏究 Vol.5 No.2

This paper discusses a distributed implementation of the Biba security policy model. Implementation of an service in the OSI-RM is not sufficient for enforcing the Biba model. Also confidentiality services are necessary. Public Key Systems(PKSs) are considered for the realization of these security services. In this paper symmetric & asymmetric cryptographic systems are considered for the realization of these security service. It is investigated how key-distributions can be found resulting in a minimum number of key.

인증서를 이용한 역할기반 접근제어방안

박종화,김지홍,Park, Chong-Hwa,Kim, Ji-Hong 한국정보기술전략혁신학회 2003 情報學硏究 Vol.6 No.1

With the development of Information Communication Technique, electronic commerce using PKIs is widely used over the Internet. The goal of access control is to counter the threat of unauthorized operations involving Web-server or data base systems. The RBAC(Role-Based Access Control) has recently received considerable attention as a promising alternative to traditional discretionary and mandatory access controls. In this paper we propose two methods, the RBAC system using attribute certificates and the RBAC system using SPKI certificates. And we analyze and compare the two methods.

속성인증서와 신분인증서 사이의 바인딩 메카니즘에 관한 연구

박종화,Park Chong-Hwa 한국정보기술전략혁신학회 2002 情報學硏究 Vol.5 No.4

An ID certificate is digitally signed by a certificate authority for authentication and a attribute certificate is digitally signed by an attribute certificate authority for authorization. In many applications in web, there should be a mechanism to bind attributes to proper identities. So we analyzed some known binding methods, selective revocation methods and cryptographic binding methods and we proposed the new mechanism in order to solve their problems.

프라이버시 보호를 갖는 확장된 역할기반 접근제어 모델

박종화(Chong-Hwa Park),김동규(Dong-Kyoo Kim) 한국통신학회 2004 한국통신학회논문지 Vol.29 No.8C

최근 프라이버시 적용이 IT 분야의 가장 중요한 문제의 하나로 대두되고 있다. 프라이버시 보호는 조직의 데이터 처리 시스템의 프라이버시 정책을 적용함으로써 달성 될 수 있다. 전통적인 보안 모델은 다소간 프라이버시 비인딩과 같은 기본적인 프라이버시 요구를 적용하기에 제안한다. 이 모델은 RBAC과 도메인-타입 적용, 그리고 프라이버시 정책을 결합 힘으로써 프라이버시 보호와 함께 문맥기반 접근제어를 제공한다. 프라이버시 정책은 역할에 프라이버시 등급을, 데이터에 고객의 프라이버시 신호에 따른 데이터 프라이버시 등급을 부여하는 데이터 사용 정책을 적용함으로써 달성한다. 또 이 모델을 응용에 적용하기 위하여 작은 병원 모델이 사용되었다.

일회성 속성인증서의 바인딩 메커니즘

박종화(Chong-Hwa Park),이상하(Sang-Ha Lee),김동규(Dong-Kyoo Kim) 한국통신학회 2004 한국통신학회논문지 Vol.29 No.2C

공개키 기반구조에서 공개키인증서는 신분확인을 위한 인증서로서 인증기관(Certificate Authority : CA)에서 전자적으로 서명되어 진다. 또 속성인증서(Attribute Certificate : AC)는 사용자의 속성 정보를 저장 관리하는 인증서로서 속성인증기관(Attribute Certificate Authority: ACA)에 의해 전자적으로 서명된다. 웹 상의 많은 응용에서 이들이 사용되기 위해서는 속성인증서를 적절한 신분인증서에 결합하는 바인딩 메커니즘이 필요하며, 이 인증서들간에 종속성이 유지되어야 한다. 본 논문에서 잘 알려진 바인딩 메커니즘인 선택적 철회 방식과 암호적 바인딩 방식을 분석하고, 위의 방식들이 갖고 있는 문제점을 해결하기 위한 하나의 대안으로 일회성 속성인증서를 사용하는 새로운 방식을 제안한다.

확장된 역할기반 접근제어 모델에서 GRBAC을 이용한 프라이버시 제어

박종화(Chong hwa Park),김지홍(Ji hong Kim),김동규(Dong kyoo Kim) 한국통신학회 2005 한국통신학회논문지 Vol.30 No.3C

최근 프라이버시 적용이 IT분야의 가장 중요한 문제의 하나로 대두되고 있다. 프라이버시 보호는 조직의 데이터 처리 시스템에 프라이버시 정책을 적용함으로써 달성될 수 있다. 전통적인 보안 모델은 목적 결합(purpose binding)과 같은 프라이버시의 기본적인 요구사항을 적용하기에 부적절하다. 본 논문은 기존의 보안모델에 통합하여 쉽게 적용할 수 있는 프라이버시 제어 모델을 제안한다. 이를 위하여 기존의 보안모델로 RBAC과 도메인-타입을 적용하여 문맥기반 접근제어를 제공하는 하나의 확장된 역할기반 접근제어 모델이 사용되었고, 프라이버시 제어 모델에서는 프라이버시 선호로 표현되는 목적 결합을 적용하기위해 GRBAC이 사용되었다. 또 이 모델의 응용을 위하여 작은 병원 모델이 고려되었다.