• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.1201-1204
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• 2005

Whereas conveniences deriving from the development of information and telecommunication technology increase, information outflow and illegal data use are also rapidly on the rise. Consequently, many studies to prevent illegal information outflow are currently under way, and the use of Smart Card is in steep jump. Recently, Java Card is diffused fast as an alternative to complement the technical problems of the Smart Card. This paper designed and materialized the system for multi-users authentication and file access control by user through designing a Java Card applet that is used for information protection and in various application fields. For allowing a file access competence, each user's file access competence is processed via drawing up the access condition table in the applet. Therefore, illegal correction, exposure and destruction of information, which become the concerns when multi-users have an access, can be prevented. In addition, its application becomes possible in the system requiring multi-users certifications.

• 재활복지공학회논문지
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• 제8권1호
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• pp.47-55
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• 2014

컴퓨터 대체접근 기기는 장애로 인해 컴퓨터 사용이 힘든 장애인들이 컴퓨터를 사용할 수 있도록 보조하는 기기이며, 이러한 기기들은 대부분 컴퓨터에 유선으로 연결하거나 S/W 프로그램을 설치하여 사용하게 된다. 대부분의 이러한 기기들은 공간적인 제한이 존재하게 되기 때문에 장애인들에게 다양하고 자유로운 컴퓨터 접근을 보장할 수 없으며 다소 불편함을 감수하게 된다. 본 논문에서는 지체장애인 및 뇌병변장애인이 언제, 어디서든 상지의 소근육 운동만으로 컴퓨터에 접근 가능한 안드로이드 기반의 컴퓨터 대체접근 마우스를 개발하였다. 개발된 마우스는 스마트기기에 사용자가 입력하는 포인트를 인식하여 이를 마우스 커서 위치로 변환하고 이를 스마트기기에 내장된 블루투스 통신을 이용하여 컴퓨터로 전달하게 된다. 또한 사용자의 피로도를 줄여 줄 수 있는 그룹스캐닝 방식을 이용하여 가벼운 터치를 이용해서 원하는 버튼을 선택하도록 함으로써 클릭, 더불클릭 및 드래그 앤 드롭 기능을 사용할 수 있도록 하였다. 개발된 컴퓨터 대체 접근 마우스는 지체 및 뇌병변장애인이 간단한 터치 한번으로 컴퓨터 사용이 가능하고, 휴대성이 좋아 시간적, 공간적 제약 없는 장애인의 컴퓨터에 접근에 이용될 것이다.

• Journal of Information Processing Systems
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• 제2권1호
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• pp.28-33
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• 2006

The initial research of Task Computing in the ubiquitous computing (UbiComp) environment revealed the need for access control of services. Context-awareness of service requests in ubiquitous computing necessitates a well-designed model to enable effective and adaptive invocation. However, nowadays little work is being undertaken on service access control under the UbiComp environment, which makes the exposed service suffer from the problem of ill-use. One of the research focuses is how to handle the access to the resources over the network. Policy-Based Access Control is an access control method. It adopts a security policy to evaluate requests for resources but has a light-weight combination of the resources. Motivated by the problem above, we propose a universal model and an algorithm to enhance service access control in UbiComp. We detail the architecture of the model and present the access control implementation.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권1호
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• pp.18-38
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• 2017

Infrastructure-as-a-Service (IaaS) clouds provide infrastructure as a pool of virtual resources, and the public IaaS clouds, e.g. Amazon Web Service (AWS) and private IaaS cloud toolkits, e.g. OpenStack, CloudStack, etc. provide their own application programming interfaces (APIs) for managing the cloud resources they offer. The heterogeneity of the APIs, however, makes it difficult to access and use the multiple cloud services concurrently and collectively. In this paper, we explore previous efforts to solve this problem and present our own implementation of an integrated cloud API, which can make it possible to access and use multiple clouds collectively in a uniform way. The implemented API provides a RESTful access and hides underlying cloud infrastructures from users or applications. We show the implementation details of the integrated API and performance evaluation of it comparing the proprietary APIs based on our cloud testbed. From the evaluation results, we could conclude that the overhead imposed by our interface is negligibly small and can be successfully used for multi-cloud access.

• 한국컴퓨터정보학회논문지
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• 제5권3호
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• pp.84-90
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• 2000

본 논문은 인터넷 환경에서 접근제어 요구 사항의 복잡한 문제를 해결하기 위한 접근제어 메커니즘의 설계 방안을 제시한다. 본 논문에서는 자원의 기밀성, 무결성 및 가용성의 공통적 목적을 달성하기 위한 접근제어 메커니즘을 제안하고, 신분-기반, 규칙-기반 및 직무-기반의 관점에서 각 관련된 정책과 규칙을 정의하였으며, 필요한 접근제어 오퍼레이션들을 구현하였다. 제안된 접근제어 메커니즘은 보안 레이블, 무결성 등급, 직무 및 소유권 등의 다단계 보안 정책을 기반으로 하여 자원에 대한 불법적인 접근을 방어 할 수 있다.

• International Journal of Computer Science & Network Security
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• 제22권5호
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• pp.89-96
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• 2022

Security is still a great concern to this day, albeit we have come a long way to mitigate its numerous threats. No-SQL databases are rapidly becoming the new database de-facto, as more and more apps are being developed every day. However, No-SQL databases security could be improved. In this paper, we discuss a way to improve the security of XML-based databases with the use of trust labels to be used as an access control model.

• International Journal of Knowledge Content Development & Technology
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• 제11권2호
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• pp.37-54
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• 2021

The study determined the access, skills and constraints towards the usage of ICT among barangay officials. A complete enumeration technique was used due to the small size of the population. A total of 121 barangay secretaries and barangay treasurers comprised the study respondents. The findings revealed that most of barangay officials have access to personal computer at home and in the office using their own mobile data and office internet connectivity. With the support from the Local Government Unit (LGU), it was found that most of the respondents are advance and proficient in computer usage. As constraints to ICT usage, the study respondents still experienced slow internet bandwidth that makes connection and communication weak along with the low income status. Consequently, it was found that there were no significant differences in terms of skills and constraints among barangay secretaries and barangay treasurers towards using ICT. It can be concluded that study respondents prefer to use office computer to access the information they need due to the convenience and availability of resources. The study respondents were competent enough to handle their job well but listed slow internet and low financial resources may hamper their ICT usage. Research implications were also offered.

• ETRI Journal
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• 제32권1호
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• pp.112-119
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• 2010

We present a useful design for a free access mat which supports two frequency bands of 2.4 GHz and 5 GHz. The free access mat is a sheet-shaped waveguide which consists of a tightly coupled double-layered microstrip resonator array. It provides easy access for devices in short-range wireless communications. Interference is a common problem with conventional applications which use free space transmission. Our proposed wireless access system uses a subsidiary waveguide, the free access mat. Wireless devices are proximately coupled to the free access mat through which the coupled electromagnetic (EM) wave transmits. The arrival domain of the EM wave of an application is therefore limited to an area close to the free access mat. Wireless devices can be coupled to the free access mat at an arbitrary position without contact. We previously presented a free access mat for a single frequency band. This paper presents a free access mat for the two frequency bands of 2.4 GHz and 5 GHz. The free access mat uses a ring patch resonator array which is easily excited by typical antennas and is resistant to interference. These characteristics are demonstrated by numerical simulation and confirmed by experiment.

• International Journal of Computer Science & Network Security
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• 제23권6호
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• pp.13-16
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• 2023

This study aims to explore the status of e-learning in the public sector institutes of the Sukkur region in Pakistan. A survey was conducted to collect data from students and teachers regarding their awareness, access, and use of e-learning resources. The results showed that although there is a widespread use of the internet and mobile devices for accessing information, there is a lack of awareness and access to e-learning resources. Barriers to accessing e-learning content and a lack of familiarity with e-learning content development technologies were also identified. The study concludes that there is a need for improved e-learning facilities and curriculum in the public sector institutes of the Sukkur region in Pakistan. Recommendations are provided for developing a correctness-centered e-learning based curriculum that is tailored to the specific needs of the students in the region. It is hoped that the findings of this study will inform efforts to improve the teaching and learning process in the region and provide students with greater flexibility and access to study materials.

• 재활복지공학회논문지
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• 제1권1호
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• pp.1-6
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• 2007

자이로센서기술을 적용하여, 헤드마우스는 웹에 접근하기위한 마우스의 좌 클릭, 우 클릭, 더블 클릭, 드래그와 드롭, 휠 기능까지 시현할 수 있도록 개발되었다. 이 기기는 USB케이블을 사용하여 PC와 매킨토시 환경에서 동작할 수 있도록 설계되었다. 이 장비를 처음 사용할 때, 손을 자유롭게 사용하지 못하는 사람에게 이 장비가 얼마나 큰 자유를 줄 수 있는지 알게 될 것이다. 컴퓨터에 얽매이는 것 대신, 음파센서에 공기를 부는 것 같은 간단한 조작은 휠 기능까지 포함한 일반 마우스의 모든 기능들을 수행할 수 있다. 또한 매크로인터페이스(macro-interface) 도 개발되었다. 반복적 작업을 메모리에 저장함으로써, 버튼 한번 클릭하는 것만으로 반복되는 작업들을 수행할 수 있다.