• 한국컴퓨터정보학회논문지
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• 제15권8호
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• pp.163-171
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• 2010

본 연구는 제품 디자인 프로세스로 각광받고 있는 알랜 쿠퍼의 사용자 중심 디자인에 근거한 페르소나모델 설정의 실제 과정을 담고 있다. 이를 위해 심층 인터뷰와 FGI를 진행하여 사용자 집단의 내비게이션 사용 특성과 동기를 추출하고, 사용자 집단의 분석을 진행하였다. 분석 내용을 기반으로 페르소나 모델을 설정하기 위한 사용자 집단을 내비게이션을 사용하는 빈도와 내비게이션의 기능 이해도에 따라 3가지 타입의 사용자층으로 나누었다. 이 3가지 유형은 활용도가 낮고 기능이해도가 낮은 모델, 활용도가 중간이고 기능이해도가 높은 모델, 활용도가 높고 기능 이해도가 높은 모델의 3가지 유형의 페르소나를 설정하는 기반이 되었다. 본 연구를 통하여 추출된 3가지 유형의 페르소나는 추후 진행된 사용자 중심 정보구조의 설계에 기반을 제공하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권7호
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• pp.3319-3338
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• 2016

Cloud storage is becoming more and more popular because of its elasticity and pay-as-you-go storage service manner. In some cloud storage scenarios, the data that are stored in the cloud may be shared by a group of users. To verify the integrity of cloud data in this kind of applications, many auditing schemes for shared cloud data have been proposed. However, all of these schemes do not consider the access authorization problem for users, which makes the revoked users still able to access the shared cloud data belonging to the group. In order to deal with this problem, we propose a novel public auditing scheme for shared cloud data in this paper. Different from previous work, in our scheme, the user in a group cannot any longer access the shared cloud data belonging to this group once this user is revoked. In addition, we propose a new random masking technique to make our scheme preserve both data privacy and identity privacy. Furthermore, our scheme supports to enroll a new user in a group and revoke an old user from a group. We analyze the security of the proposed scheme and justify its performance by concrete implementations.

• Journal of Information Processing Systems
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• 제10권4호
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• pp.568-580
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• 2014

To enhance the utilization of the traffic channels of a network (instead of allocating radio channel to an individual user), a channel or a group of channels are allocated to a user group. The idea behind this is the statistical distribution of traffic arrival rates and the service time for an individual user or a group of users. In this paper, we derive the blocking probability and throughput of a subscriber station of Worldwide Interoperability for Microwave Access (WiMAX) by considering both the connection level and packet-level traffic under a complete partition scheme. The main contribution of the paper is to incorporate the traffic shaping scheme onto the incoming turbulent traffic. Hence, we have also analyzed the impact of the drain rate of the buffer on the blocking probability and throughput.

• Journal of Multimedia Information System
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• 제4권3호
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• pp.145-150
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• 2017

Recently, game companies are having difficulties in exactly figuring out the right consumer groups for their games. To solve this problem, a system algorithm which recommends user-customized games based on the user information entered has been proposed in this study. Game developers will be able to clearly determine the consumer group(s) of both on and off-line games through accumulated data while consumers can find the game they desire. It is expected that the gaming culture will advance further with the proposed algorithm.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2006년도 춘계학술대회
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• pp.344-353
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• 2006

Nowadays many people participate in online communities for information sharing. But most recommender systems are designed for personalization of individual user, so it is necessary to develop a recommendation procedure for group users, such as participants in online communities. This paper proposes a group recommender system to recommend books for group users in online communities. For such a purpose, we suggest a group recommendation procedure consisting of two phases. The first phase is to generate recommendation list for 'big user' using collaborative filtering, and the second phase is to remove irrelevant books among previous list reflecting the preference of each individual user. The procedure is explained step by step with an illustrative example. And this procedure can potentially be applied to other domains, such as music, movies and etc.

• Annals of Clinical Neurophysiology
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• 제5권1호
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• pp.16-20
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• 2003

Background: Mobile phone has become a very popular device used in everyday our lives. However, the possible hazard to human body such as brain tumor has been proposed intermittently. This unwanted possibility was calmed down due to the absence of definite evidence of hazard. This study was performed to see the effect of mobile phone use on the brain temperature. Methods: In 20 volunteers, we performed 4 steps of temperature measuring procedure. Four steps are pre-use (S1, basal state), wire-phone (S2, conventional telephone), PCS phone (S3, using 1,750~1,900 MHz), cellular phone (S4, using 820 MHz) states. Brain temperatures were measured by radiothermometer at 10 sites (5 sites in each hemisphere) of the brain after 5minutes of telecommunication through the phones. The final data were compared using paired t-test. Results: In PCS phone user group (Average; $35.73708^{\circ}C$), brain temperature decreased (with statistical significance, p<0.05), compared to those of non-user group (Average; $35.9527^{\circ}C$) or conventional wire phone user group. In cellular phone user group (Average; $35.82155^{\circ}C$), brain temperature decreased slightly (without statistical significance, p>0.05) compared to those of non-user group (Average; $35.9527^{\circ}C$) or conventional wire phone user group (Average; $35.922^{\circ}C$). The temperature change was not limited to the mobile phone applied side but on both hemisphere of the brain. Conclusion: In conclusion, mobile phone (especially PCS phone) decreased brain temperature in both hemispheres without side-to-side temperature difference. In addition, this study suggests possibility of radiothermometer application to the study of electromagnetic wave effect and protection method research in the future.

• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.65-72
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• 2016

Vehicle and marine navigation which are currently being commercialized provide route guidance service by specifying a fixed position as a destination. In the route guidance service of existing navigation, if the destination has to be changed in the middle, a new destination must be designated again to obtain the navigation service. However, if the destination can't be designated, it is difficult to clearly use it. In this paper, in order to overcome the difficulties of directions in the existing navigation, a new navigation specifying moving targets as the destination has been developed to get the directions. A proposed system is that a group is made and a group manager is appointed as a destination and then a user can get the route guidance based on location of the group manager. In the service way, relationship between the group manager and user is one-to-many and relationship between the user and group manager is one-to-one. The proposed technology is able to provide services that the user can easily find the moving targets such as the positioning surrogate drivers, tracking routes and location among travelers and finding children.

• 정보교육학회논문지
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• 제18권2호
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• pp.203-212
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• 2014

최근 증대한 성인 및 청소년의 스마트폰 중독 문제에 대해 본 연구에서는 기존에 다소 소홀히 다루어졌던 초등 고학년생들의 스마트폰 중독 실태를 다양한 인구통계학적 요소에 따라 조사하였다. 설문 조사는 경기도 소재 학교의 4~6학년생 1570명을 대상으로 실시되었고, 조사 결과, 첫째, 스마트폰 평균보유율은 약 66%이었다. 둘째, 약 1%의 학생들이 고위험 사용자군에 속하였고, 잠재위험군 5.7%, 일반 사용자군은 93.3%이었다. 셋째, 인구통계학적 요소에서 학년, 학업성적 각각과 중독 사용자군의 상관이 유의하였다. 즉, 부진한 성적일수록, 또는 학년이 오를수록 중독 가능성이 매우 높았다. 넷째, 잠재위험군과 일반군 학생들 모두 대도시, 남학생, 6학년, 맞벌이 부모의 경우에 더욱 중독 점수가 높았다. 반대로 가정경제와 학업성적 측면에서는 잠재위험군은 풍족한 가정과 우수한 성적인 경우 중독성이 더욱 높았으나, 일반군은 빈곤 기정, 부진한 성적인 경우에 더욱 높은 점수를 나타내었다.

• 교육시설 논문지
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• 제20권3호
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• pp.3-12
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• 2013

The study explored empirically user participatory design methods for realizing user demand efficiently and evaluating alternatives systematically by using design indicators such as the design quality indicators system of the UK. In the empirical exploratory process utilizing design indicators, the study selected design indicators, and conducted a survey of design realization methods, evaluation methods, and user participatory design utilizing design indicators. Also, concerning the empirical exploratory process, it can be classified into a preliminary survey aimed at those majoring in architecture; a user group survey aimed at elementary school students, parents, and teachers; and a professional group survey aimed at professionals in architecture. In particular, the study carried out the survey for the empirical exploratory process of user participatory design by combining on-line and off-line methods.

• 한국컴퓨터정보학회논문지
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• 제8권4호
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• pp.57-62
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• 2003

디자인 프로세스의 초기단계에서 컨셉 디자인은 창의적인 아이디어 발상이 요구되는 단계로 제품의 성공과 실패여부를 조기에 판가름 할 정도로 중요한 일이다. 이를 위해 개발된 웹 기반 창의적 발상 시스템(Creative Group Thinking System:이하 CGTS)은 이와 같은 컨셉디자인 단계에서 아이디어 발상을 지원하기위해 개발된 것이다. 따라서 본 연구는 HCI(Human Computer Interface)와 UI(User Interface)에 대하여 알아보고 이를 토대로 하나의 웹 기반 발상시스템(CGTS)의 UserInterface(이하 UI)를 개선하여 사용성을 높이는데 목적을 둔다.