• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제15권9호
• /
• pp.3274-3297
• /
• 2021

Permission delegation is an important research issue in access control. It allows a user to delegate some of his permissions to others to reduce his workload, or enables others to complete some tasks on his behalf when he is unavailable to do so. As an ideal solution for controlling read access on outsourced data objects on the cloud, Ciphertext-Policy Attribute-Based Encryption (CP-ABE) has attracted much attention. Some existing CP-ABE schemes handle the read permission delegation through the delegation of the user's private key to others. Still, these schemes lack the further consideration of granularity and traceability of the permission delegation. To this end, this article proposes a flexible and fine-grained CP-ABE key delegation approach that supports white-box traceability. In this approach, the key delegator first examines the relations between the data objects, read permission thereof that he intends to delegate, and the attributes associated with the access policies of these data objects. Then he chooses a minimal attribute set from his attributes according to the principle of least privilege. He constructs the delegation key with the minimal attribute set. Thus, we can achieve the shortest delegation key and minimize the time of key delegation under the premise of guaranteeing the delegator's access control requirement. The Key Generation Center (KGC) then embeds the delegatee's identity into the key to trace the route of the delegation key. Our approach prevents the delegatee from combining his existing key with the new delegation key to access unauthorized data objects. Theoretical analysis and test results show that our approach helps the KGC transfer some of its burdensome key generation tasks to regular users (delegators) to accommodate more users.

• 한국산학기술학회논문지
• /
• 제12권2호
• /
• pp.581-587
• /
• 2011

계수형 데이터를 이용하여 신뢰도를 추정하는 방법은 원자력 설비, 의약품, 우주발사체 등과 같은 다양한 시스템의 신뢰도 평가에 사용되고 있다. 본 논문은 모수 추정법을 포함하여 문헌에 공개된 신뢰도 추정방법에 대한 샘플 수 및 샘플링 시점 수 변화에 대한 정확성의 민감도를 분석하고 비교한 결과를 제시한다. 또한 민감도 분석 결과를 이용하여 각 추정 방법의 정확성을 향상시키기 위한 방안을 제시하였다.

• International Journal of Computer Science & Network Security
• /
• 제22권5호
• /
• pp.97-102
• /
• 2022

Network intrusion detection is becoming an increasing necessity for both organizations and individuals alike. Detecting intrusions is one of the major components that aims to prevent information compromise. Automated systems have been put to use due to the voluminous nature of the domain. The major challenge for automated models is the noise and data imbalance components contained in the network transactions. This work proposes an ensemble model, Attribute Subset Selector Bagging (ASUB) that can be used to effectively handle noise and data imbalance. The proposed model performs attribute subset based bag creation, leading to reduction of the influence of the noise factor. The constructed bagging model is heterogeneous in nature, hence leading to effective imbalance handling. Experiments were conducted on the standard intrusion detection datasets KDD CUP 99, Koyoto 2006 and NSL KDD. Results show effective performances, showing the high performance of the model.

• 대한공간정보학회지
• /
• 제8권2호
• /
• pp.71-78
• /
• 2000

현재 지적도 전산화에 기록된 속성자료는 도형자료와의 연계를 고려하여 작성된 것이 아니고 형식면에서 자료가 기재된 상태로 사용되고 있다 따라서 다양한 공간정보의 분석과 종합도형정보의 기초 자료로 활용하기 위해서는 속성자료와 지적도가 연계되어 수치정보화가 이루어져야 한다. 본 연구는 도해지적도와의 관련 사항들을 기준으로 도형 및 속성정보를 연계하여 지적정보를 효율적으로 구축하여 활용하고자 하였다. 속성정보는 데이터 모델링을 이용하여 개체-관계 다이어그램으로 표현하므로써 관계형 데이터베이스의 형태로 구축하였다. 그리고 다양한 공간분석 및 응용방법을 제시함으로써 지적정보를 효율적으로 관리하고 지적도면의 전산화 방안을 비롯하여 각종 공공계획을 수립, 설계하는데 기초자료로 제시하고자 한다.

• 한국측량학회지
• /
• 제30권6_1호
• /
• pp.559-565
• /
• 2012

본 연구에서는 BIM과 GIS간 공간정보 상호 운용성을 위해 BIM과 GIS의 대표적인 중립 모델인 IFC와 CityGML간의 상호 운용성을 위한 속성 정보 맵핑을 위한 규칙 정의 메타 데이터를 제안하고 구현 한다. 이를 위해 IFC와 CityGML의 맵핑을 위한 구조를 분석하고 이를 바탕으로 BIM과 GIS간 정보 상호 운용성을 위한 속성 정보 맵핑을 위한 메타 데이터를 제안한다. 메타 데이터는 BIM 모델과 GIS 모델 간의 연결을 위한 연결 정보, 관점 별 맵핑 규칙, 맵핑 규칙을 정의한 연산자와 속성 정의로 구성된다. 이 구조를 설계하고 XML로 표현하였으며, 이를 이용해 속성 정보를 자동 맵핑하는 시스템을 구현하였다.

• 한국통신학회논문지
• /
• 제37권4B호
• /
• pp.288-299
• /
• 2012

최근 모바일 클라우드 환경에서 공유되는 데이터의 기밀성과 유연성있는 접근제어를 보장하기 위해서 KP-ABE(Key Policy-Attribute Based Encryption)와 PRE(Proxy Re-Encryption)를 활용한 시스템 모델이 제안되었다. 그러나 기존 방식은 철회된 사용자와 클라우드 서버간의 공모 공격으로 데이터 기밀성을 침해하게 된다. 이러한 문제를 해결하기 위해서 제안 방식은 클라우드 서버에 저장되는 데이터 파일(data file)을 분산 저장하여 데이터 기밀성을 보장하고 비밀분산(Secret Sharing)를 통해서 프록시 재암호화키에 대한 변조 공격을 방지한다. 그리고 제안방식을 의료 환경에 적용한 프로토콜 모델을 구성한다.

• 동아시아식생활학회지
• /
• 제18권2호
• /
• pp.165-171
• /
• 2008

The purpose of this study was to measure tourists' preference for alternative restaurants with different combinations of attribute levels: grown area logo, origin description, traditional food, fusion food, national food, and price. A total of 210 questionnaires were completed. A conjoint experimental method was used to develop hypothetical restaurants, and an ordinal probit model was used to measure the effects of the attribute levels on tourists' preference. The ordinal probit model analysis results for the data indicated an excellent model fit. The effects of the attribute levels on tourists' preferences were statistically significant. As expected, estimates of the marginal willingness to pay were statistically significant Moreover, the tourists were more willing to pay for grown area logo as compared to the other attribute levels. The tourists also considered the grown area logo as a very important attribute. Withe regard to developing and testing conjoint models in the design of choice experiments involving multifactor alternatives, this study may approach a deeper understanding of the conjoint experiment. Greater understanding of the conjoint experiment can improve the managerial diagnoses of the problems as well as the opportunities for different marketing strategies including local branding programs and menu development and marketing communications.

• 한국의류학회지
• /
• 제24권8호
• /
• pp.1197-1208
• /
• 2000

The purpose of this study was to find out the effects of the accord between consumers benefit factors and attribute factors of brand image on brand attitude. This study was based on Kellers conceptualizing model of brand image. The subjects were 605 working women in their twenties living in Seoul, Korea. The data were analyzed by Euclidian distance model, ANOVA of repeated measures, regression, F-test by Extra Sum of Squares Principle. The results were as follows. 1. There were significant differences among the brands and among the segmented groups in the accord between benefit factors and attribute factors of brand image and in the brand preference. Moreover there were significant interactions between the brands and the segmented groups in the accord between benefit factors and attribute factors of brand image and in the brand preference. 2. There were significant effects of the accord between benefit factors and attribute factor of brand image on brand attitude. 3. There were significantly different effects of the accord between benefit factors and attribute factors of brand image on brand attitude among the segmented groups.

• Journal of Information Technology Applications and Management
• /
• 제16권4호
• /
• pp.93-107
• /
• 2009

This study investigated consumer preferences for Internet medical information service in China using the multi-attribute utility theory. The multi-attribute utility theory is a compositional approach for modeling consumer preferences wherein researchers calculate the overall service utility by summing up the evaluation results for each attribute. We found that Chinese Internet medical information users consider the availability of information and quick response to be the most important attributes. Further, they think that the comment feature is less important as compared to other attributes such as costs and updates. In addition, we found that the Internet users having more Internet experience consider these attributes to be more important as compared to the people who are just beginning to surf the Internet. For any successful Internet business, Internet marketers should assess individual-level preference and accordingly organize a fresh campaign. As of now, Internet marketers need estimation methods to predict the market performance of new services in many different business environments. We believe that the multi-attribute utility theory is a useful approach in this regard.

• 대한안전경영과학회지
• /
• 제14권3호
• /
• pp.283-289
• /
• 2012

In the future, smartphone convergences are not only based on the on/offline integration, but also with the integration between mobile communications and broadcasts. Therefore, there is a need to search for new direction of mobile device that enables variety user applications that are different from the existing size and application issue. The aim of this research is to improve user interface of smartphone's functional attribute. We study on the analysis of smartphone's functional attribute by AHP. The survey results in this paper showed that the most preferable attribute of smartphone among the 8 was the wireless internet 25.3%, followed by messaging 20% and application 19.8%, which totaled to 62.5%. But the samples used were mostly limited to those aged 20 through 30. So the results are not considered as a representative preference of all smartphone users, and should be considered otherwise before materializing them to a product. Therefore, for the more liable results the further research should be conducted to gather data from a variety of users of all ages, and the functional attribute should be analysed through QFD.