• 융합보안논문지
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• 제6권4호
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• pp.1-9
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• 2006

역할 기반 접근제어 모델은 접근 권한이 역할(role)에 부여되고 사용자는 적절한 역할에 소속됨으로서 역할의 수행에 필요한 최소 자원만을 접근할 수 있도록 한다. 본 논문에서는 RBAC의 중요한 논점 중에 하나인 위임의 문제를 권한 위임, 관리, 감독에 있어 실제 기업에서 이루어지는 사용자 수준에서 기능단위로 적용하는 새로운 모델을 제안한다. 위임을 기능단위로 하면 역할을 직접 위임하는 기존의 방식보다 위임으로 인한 권한 적용 오류를 최소화된다. 또한 위임에 따른 보안문제를 감독하기 위해 승인부분을 추가하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2465-2467
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• 2004

In this paper we present the guideline to evaluate the easiness of using personal robots and their learning abilities based on the analysis of their built-in commands, user interfaces, and intelligences. Recently, we are breathing with robots that can be able to do lots of roles. cleaning, security, pets and education in real life. They can be classified as home robots, guide robots, service robots, robot pets, and so on. There are, however, no standards to evaluate their ability, so it is not easy to select an appropriate robot when a user wants to buy it. Thus, we present, as a guideline that can be a standard for the evaluation of the personal robots, the standards by means of analyzing existing personal robots and results of the recent research works. We will, also, describe how to apply the evaluation method th the personal robot.

• ETRI Journal
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• 제42권3호
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• pp.333-340
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• 2020

We consider a hybrid combiner design for downlink massive multiple-input multiple-output systems when there is residual inter-user interference and each user is equipped with a limited number of radio frequency (RF) chains (less than the number of receive antennas). We propose a hybrid combiner that minimizes the mean-squared error (MSE) between the information symbols and the ones estimated with a constant amplitude constraint on the RF combiner. In the proposed scheme, an iterative alternating optimization method is utilized. At each iteration, one of the analog RF and digital baseband combining matrices is updated to minimize the MSE by fixing the other matrix without considering the constant amplitude constraint. Then, the other matrix is updated by changing the roles of the two matrices. Each element in the RF combining matrix is obtained from the phase component of the solution matrix of the optimization problem for the RF combining matrix. Simulation results show that the proposed scheme performs better than conventional matrix-decomposition schemes.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1991년도 봄 학술발표회 논문집
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• pp.50-55
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• 1991

This paper presents database technique for an computer-integrated structural design system of buildings. Network database designed to support all the processes of structural design, such as, planning, modelling, analysis, member design and redesign processes etc. stores all information from user input and system results effectively and so provides centeral communication area between applications. The user interface wi th interactive and batch modes plays roles of building modeler including conventional pre-processor and post-processor. The concepts of 'Planar Surface Modeling' and 'Geometry Zoning' are defined for easy construction of building model. The concept presented in this paper will save the time and memory required for model generation and contribute to data consistency, thus leave a designer more time actually performing the analyses and interpreting the results. The formulation of automating the process of bulilding model ins and structural analysis is the key to study.

• 한국농공학회지
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• 제44권7호
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• pp.74-82
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• 2002

There are two major operation and management (O & M) systems in Korea, one by the Korea Agricultural and Rural Infrastructure Corporation (KARICO), a government corporation, and the other by non-KARICO, which includes Irrigation associations (IAs) and individual farmers under the supervision of city or county authorities. Main issues and constraints in the irrigation facility management are: (1) The dual system of the irrigation water management system; management by KARICO and that by IAs, and (2) From the commencement of KAICO in 2000, farmers were exempted from water charge. This is opposite to the international trend, which follows' user pay principle: Main specific strategies to improve irrigation management system are: (1) Introduction of water metering for water charge as well as water conservation, (2) Adoption of demand-oriented irrigation rather than supply-oriented to reduce waste of water, (3) To augment farmer's participation by forming water user associations, (4) To maintain consistency of government policy, (5) To promote roles of local governments, and (6) To reestablish the role of KARICO.

• 한국산업정보학회논문지
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• 제7권4호
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• pp.74-82
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• 2002

인터넷의 폭발적인 성장과 함께 많은 웹사이트 평가 방법론이 제안되어 왔지만 웹사이트의 다양한 측면을 모두 고려하지는 못하고 있다. 따라서, 본 논문은 웹사이트에 대한 다양한 시각을 통합적인 관점에서 평가하기 위한 방법론을 제시한다. 제안된 방법론은 다음과 같은 네 가지의 관점을 포함하고 있다: 사용자-판단 관점, 사용자-성과 관점, 전문가-판단 관점, 전문가-성과 관점. 각 관점별로 방법론을 구성하는 절차 및 기법이 설명되어지고 끝으로 방법론이 갖는 시사점이 논의된다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권3호
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• pp.1722-1737
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• 2019

We developed an insider threat detection model to be used by organizations that repeat tasks at regular intervals. The model identifies the best combination of different feature selection algorithms, unsupervised learning algorithms, and standard scores. We derive a model specifically optimized for the organization by evaluating each combination in terms of accuracy, AUC (Area Under the Curve), and TPR (True Positive Rate). In order to validate this model, a four-year log was applied to the system handling sensitive information from public institutions. In the research target system, the user log was analyzed monthly based on the fact that the business process is processed at a cycle of one year, and the roles are determined for each person in charge. In order to classify the behavior of a user as abnormal, the standard scores of each organization were calculated and classified as abnormal when they exceeded certain thresholds. Using this method, we proposed an optimized model for the organization and verified it.

• Journal of Information Processing Systems
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• 제20권3호
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• pp.360-374
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• 2024

A personalized course recommendation algorithm based on deep learning in an online education cloud platform is proposed to address the challenges associated with effective information extraction and insufficient feature extraction. First, the user potential preferences are obtained through the course summary, course review information, user course history, and other data. Second, by embedding, the word vector is turned into a low-dimensional and dense real-valued vector, which is then fed into the compressed interaction network-deep neural network model. Finally, considering that learners and different interactive courses play different roles in the final recommendation and prediction results, an attention mechanism is introduced. The accuracy, recall rate, and F1 value of the proposed method are 0.851, 0.856, and 0.853, respectively, when the length of the recommendation list K is 35. Consequently, the proposed strategy outperforms the comparison model in terms of recommending customized course resources.

• 정보보호학회논문지
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• 제28권5호
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• pp.1035-1045
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• 2018

최근 IT 기술이 발전함에 따라 클라우드 서비스를 이용하는 사용자의 인증 방법이 다양화 되고 있다. 그러나, 클라우드 서비스를 이용하는 사용자의 인증 정보를 권한에 따라 안전하게 제공하는 연구는 현재까지 미비하다. 본 논문은 Intra 클라우드 환경에서 사용자의 역할 권한에 따라 비밀키와 접근 제어키를 사용하는 분할 인증이 가능한 키 설립 프로토콜을 제안한다. 제안 프로토콜은 사용자의 속성과 생성된 랜덤수($t_1$, $t_2$)를 함께 이용하여 사용자의 접근제어 키와 비밀키를 생성하고, 키 생성 후 사용자의 권한에 따라 사용자의 역할을 분류하기 때문에 사용자의 인증 절차에 사용되는 불필요한 동작과정을 줄일 수 있다. 성능평가 결과 제안 프로토콜은 사용자의 접근제어 키와 비밀키를 분할하여 사용자를 인증하기 때문에 클라우드 환경에서 발생할 수 있는 다양한 공격 유형에 대한 안전성이 보장이 되었고, 키 설립에 이용된 암호문의 크기는 기존 프로토콜보다 ${\sum}+1$ 만큼 줄였다.

• 한국실내디자인학회논문집
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• 제24권4호
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• pp.80-90
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• 2015

This study aims to improve plans by analyzing spatial compositions of cohousing common houses, their role depending on the types of users and spaces, and satisfaction from the user-oriented design perspective. For this study, a basic concept was examined based on previous studies and literature reviews. So-Haeng-Ju(Happy House with Communication) Houses 1, 2, and 3 in Seongmisan Village was analyzed. As well, interviews with residents of these houses were conducted to analyze the role of user behavior in common house depending on the types of users and spaces. As a result, it was found that there were common characteristics of roles in an exchange with neighbors, cooperative child-care, and residents' meetings. The time and behavioral types were different depending on the living patterns, characteristics, and family members of residents. User satisfaction with the locations of community facilities including communal kitchen and communal living room, the composition of rooms, communication with residents, and the connection between communal living space and personal living space, was above the average. However, user satisfaction with storage facilities, or defect repair and facility maintenance was low. Most of cohousing common house users were satisfied with the use and size of spaces, and a sense of community, including communication with neighbors beyond the environment and Seongmisan Village. In conclusion, a realistic alternative is required for future cohousing by developing a system regarding human resources networks and cost bearing issues.