• Title/Summary/Keyword: 사용자 관심

Search Result 2,456, Processing Time 0.028 seconds

kNN Query Processing Algorithm based on the Encrypted Index for Hiding Data Access Patterns (데이터 접근 패턴 은닉을 지원하는 암호화 인덱스 기반 kNN 질의처리 알고리즘)

  • Kim, Hyeong-Il;Kim, Hyeong-Jin;Shin, Youngsung;Chang, Jae-woo
    • Journal of KIISE
    • /
    • v.43 no.12
    • /
    • pp.1437-1457
    • /
    • 2016
  • In outsourced databases, the cloud provides an authorized user with querying services on the outsourced database. However, sensitive data, such as financial or medical records, should be encrypted before being outsourced to the cloud. Meanwhile, k-Nearest Neighbor (kNN) query is the typical query type which is widely used in many fields and the result of the kNN query is closely related to the interest and preference of the user. Therefore, studies on secure kNN query processing algorithms that preserve both the data privacy and the query privacy have been proposed. However, existing algorithms either suffer from high computation cost or leak data access patterns because retrieved index nodes and query results are disclosed. To solve these problems, in this paper we propose a new kNN query processing algorithm on the encrypted database. Our algorithm preserves both data privacy and query privacy. It also hides data access patterns while supporting efficient query processing. To achieve this, we devise an encrypted index search scheme which can perform data filtering without revealing data access patterns. Through the performance analysis, we verify that our proposed algorithm shows better performance than the existing algorithms in terms of query processing times.

The Influence of an Aesthetically Appealing Product on the Using Time, Flow, and Recall Memory (제품의 심미성이 제품의 사용시간, 몰입도, 정보 기억도에 미치는 영향)

  • Lee, Jae-Hwa;Suk, Hyeon-Jeong
    • Science of Emotion and Sensibility
    • /
    • v.11 no.2
    • /
    • pp.257-270
    • /
    • 2008
  • Three experiments were carried out in order to determine whether users have longer using time, better recall of product information, and flow in an aesthetically appealing product (media player) in products offering good usability. For the experiment, fourteen emotional words were employed which were made up of 8 aesthetic and 6 usability words. In a preliminary experiment, the subjects freely used three media players and selected emotional words by a 7-point likert scale to distinguish a group of similar usability value and another group contrary to the other in aesthetic and usability value. (N=18) In the main experiment, it was hypothesized that users use more and have more flow and recalled information in the case of the aesthetically appealing product. Therefore, in the main experiment, we measured how much time subjects spent using the product and asked them to make an assumption regarding the time spent by the group that has the same usability value. We then examined the time they spent and the gap between the actual and estimated time. We also calculated the amount of menu information recalled via a questionnaire. In the last experiment, we selected the group of products contrary to each other in aesthetic and usability value and assessed the differences in using time, recall of product information, and flow. (N=18) The empirical results provide evidence that aesthetically appealing products are associated with greater flow and recall of product information than other products, thus supporting the hypothesis. In addition, it was found that there is a positive correlation between the aesthetically appealing product and flow index as well as with recalled information.

  • PDF

Design and Implementation of an Embedded Spatial MMDBMS for Spatial Mobile Devices (공간 모바일 장치를 위한 내장형 공간 MMDBMS의 설계 및 구현)

  • Park, Ji-Woong;Kim, Joung-Joon;Yun, Jae-Kwan;Han, Ki-Joon
    • Journal of Korea Spatial Information System Society
    • /
    • v.7 no.1 s.13
    • /
    • pp.25-37
    • /
    • 2005
  • Recently, with the development of wireless communications and mobile computing, interest about mobile computing is rising. Mobile computing can be regarded as an environment where a user carries mobile devices, such as a PDA or a notebook, and shares resources with a server computer via wireless communications. A mobile database refers to a database which is used in these mobile devices. The mobile database can be used in the fields of insurance business, banking business, medical treatment, and so on. Especially, LBS(Location Based Service) which utilizes location information of users becomes an essential field of mobile computing. In order to support LBS in the mobile environment, there must be an Embedded Spatial MMDBMS(Main-Memory Database Management System) that can efficiently manage large spatial data in spatial mobile devices. Therefore, in this paper, we designed and implemented the Embedded Spatial MMDBMS, extended from the HSQLDB which is an existing MMDBMS for PC, to manage spatial data efficiently in spatial mobile devices. The Embedded Spatial MMDBMS adopted the spatial data model proposed by ISO(International Organization for Standardization), provided the arithmetic coding method that is suitable for spatial data, and supported the efficient spatial index which uses the MBR compression and hashing method suitable for spatial mobile devices. In addition, the system offered the spatial data display capability in low-performance processors of spatial mobile devices and supported the data caching and synchronization capability for performance improvement of spatial data import/export between the Embedded Spatial MMDBMS and the GIS server.

  • PDF

Study on the Use of SNS(Social Network Service) for Tasks :Focus on the Task-Media Fit (과업수행을 위한 소셜네트워크서비스(SNS)의 활용에 대한 연구: 과업-매체적합성을 중심으로)

  • Park, Kyung-Ja;Park, Seong-Joon;Jang, HeeYoung
    • Journal of Digital Convergence
    • /
    • v.12 no.2
    • /
    • pp.577-586
    • /
    • 2014
  • As SNS has increased its influence on the society as a whole, companies also have started to consider how to take advantage of the new service paying specific attention to its characteristics of immediacy, sharability and interactivity. This study aims to circumstantiate the relationship between a task support tool of SNS and task-media fit, user characteristics and performance by focusing on its usage in work field. To address this issue, a Task-Technology Fit model is used to propose a research model considering the characteristics of SNS as a social element, information technology as well as its user characteristics. The outcome shows that job characteristics, virtual competence and media characteristics have a significant influence on task-media fit, whereas virtual competence and SNS characteristics variables have a significant influence on SNS usage. Besides, task-media fit has a significant influence on SNS usage and work performance while SNS usage has a significant influence on work performance. The study suggests that strategic use of SNS helps improve work performance and these individual characteristics should be considered in planning of SNS utilizing strategy.

Application of Real Option based Life Cycle Cost Analysis for Reflecting Operational Flexibility in Solar Heating Systems (실물옵션 기반의 LCC분석을 통한 태양열난방시스템의 운영유연성 반영 방안)

  • Choi, Ju-Yeong;Kim, Hyeong-Bin;Son, Myung-Jin;Hyun, Chang-Taek
    • Korean Journal of Construction Engineering and Management
    • /
    • v.16 no.4
    • /
    • pp.70-79
    • /
    • 2015
  • With the rise of the interest in a renewable system, the importance of the Life Cycle Cost Analysis(LCCA), an economic evaluation tool, has been increasing. However, there is an inevitable gap between a real cost and an estimation from LCCA because of the uncertainty of the external environment in real world. As the input variables in an analysis, such as a real discount rate and an energy cost, ares subject to change as time goes by, strategic decision on the current operating system is made depending on the real cost. Current economic evaluation approaches have treated only the fluctuation of input variables without consideration of the flexibility in operation, which has consequently led to the impairment on the reliability of LCCA. Therefore, new approach needs to be proposed to consider both the uncertainty of input variables and operational flexibility. To address this issue, the application of the Real Option to LCCA is presented in this study. Through a case analysis of LCCA of a solar heating system, the limits and current status of LCCA are identified. As a result, quantitative presentation of strategic decisions has been added in the new approach to implement the traditional approach.

Current Status of Elementary Students' Internet Addition: Differences according to Students' Gender and Grade (초등학생의 인터넷 중독 실태: 성과 학년별 차이를 중심으로)

  • Kim, Hyeong-Man;Lee, Bo-Ram;Jo, Mi-Heon
    • 한국정보교육학회:학술대회논문집
    • /
    • 2010.08a
    • /
    • pp.1-8
    • /
    • 2010
  • With recent surge of Internet use, many people become concerned with side effects of Internet. Especially Internet addiction has become a significant issue. As the rate of teenagers' Internet use is higher than the rates of other age groups, and Internet takes an important part in teenagers' everyday lives, many people become concerned with Internet addition. Internet addiction is salient even among elementary school students. The purpose of this study is to grasp the realities of elementary students' Internet addiction using an evaluation tool developed for elementary school students, and to analyze differences in the addiction rate according to students' gender and grade. A survey was conducted to 989 5th and 6th graders selected from nationwide schools. The results of this study show that 5.0% of the students are in the stage of serious addiction, and 15.7% in the stage of early addiction. In addition, significant differences are found between boys and girls and between 5th graders and 6th graders.

  • PDF

An Experimental Research on the Usability of Indirect Control using Finger Gesture Interaction in Three Dimensional Space (3차원 공간에서 손가락 제스쳐 인터랙션을 이용한 간접제어의 사용성에 관한 실험연구)

  • Ham, Kyung Sun;Lee, Dahye;Hong, Hee Jung;Park, Sungjae;Kim, Jinwoo
    • The Journal of the Korea Contents Association
    • /
    • v.14 no.11
    • /
    • pp.519-532
    • /
    • 2014
  • The emerging technologies for the natural computer interaction can give manufacturers new opportunities of product innovation. This paper is the study on a method of human communication about a finger gestures interaction. As technological advance has been so rapid over the last few decades, the utilizing products or services will be soon popular. The purpose of this experiment are as follows; What is the usefulness of gesture interaction? What is the cognitive impact on gesture interaction users. The finger gestures interaction consist of poking, picking and grasping. By measuring each usability in 2D and 3D space, this study shows the effect of finger gestures interaction. The 2D and 3D experimental tool is developed by using LeapMotion technology. As a results, the experiments involved 48 subjects shows that there is no difference in usability between the gestures in 2D space but in 3D space, the meaningful difference has been found. In addition, all gestures express good usability in 2D space rather than 3D space. Especially, there are the attractive interest that using uni-finger is better than multi-fingers.

HTTP Adaptive Streaming Method for Service-compatible 3D Contents Based on MPEG DASH (MPEG DASH 기반 service-compatible 3D 콘텐츠 대상 HTTP adaptive streaming 적용방안)

  • Park, Gi-Jun;Lee, Gil-Bok;Lee, Jang-Won;Kim, Kyu-Heon
    • Journal of Broadcast Engineering
    • /
    • v.17 no.2
    • /
    • pp.207-222
    • /
    • 2012
  • Recently, many consumer electronics manufacturers have produced 3D devices such as 3DTVs and 3D monitors as interests in a stereoscopic video service are getting increased. However, most of 3D services are focused on local storage or bandwidth guaranteed service since 3D stereoscopic video service require bandwidth more stable and larger. This property causes difficulties in seamless stereoscopic video streaming services under IP based open network environment that cannot guarantee quality of services. In order to achieve a seamless video streaming service the international standard organization MPEG (Moving Pictures Experts Group) has developed the adaptive HTTP streaming technology called as DASH (Dynamic Adaptive Streaming over HTTP). However, the DASH doesn't have obvious scheme which can express the two elementary video streams based service-compatible stereoscopic contents in one segment. Therefore, this paper proposes a scheme of efficient 3D adaptive streaming service based on the DASH, which covers not only frame-packing stereoscopic contents but also service-compatible ones. The 3D adaptive HTTP streaming scheme introduced in this paper is able to provide 3D contents with various qualities to user and also has benefit that single 3D content can be applied to a variety of devices.

A Study on Principle for Use of Multimedia in order to have Effective Communication in Information Design (정보디자인에서 효과적 커뮤니케이션을 위한 멀티미디어 사용원리에 관한 연구)

  • Lee, Il-Soon
    • Cartoon and Animation Studies
    • /
    • s.13
    • /
    • pp.255-267
    • /
    • 2008
  • Recently in the field of information design use of multimedia Including animation has been rapidly increased. And its application is expanding in the field of design nevertheless relevant research in this field is scant. In particular research on which characteristics contribute to improvement for effect of information communication is negligible. Until now designers' interest was mainly focused on visual perfection of screen such as diversity and originality. Actually the aspect of recognition of design was mostly overlooked. But considering ultimate purpose of Information design is accurate communication of information thus there should be more endeavor for research on man's visual recognitive faculty and memory in order to Improve power of communication of information for the purpose of reducing confusion of user before its originality and diversity. For this reason this author in this treatise attempted to examine possible impact of multimedia in information design on recognition of user and communication based on theory of effectiveness of media and also attempted to identify how maximize its effect under different circumstances. Theories on effectiveness of media can be summed up as that well- advanced information of multimedia should be analysed from diverse standpoints on relevancy to tasks and recognitive relevancy rather than its simplification from the standpoint of richness of media. For optimal interface design unnecessary recognitive load should be eliminated and information should be structured by laking maximum advantage of working memory of limited quantity. Also there will be need for selection of proper media and suggestion of expressive method to enable building accurate and successful mental image. In this treatise this author attempted to contribute to designer's decision making in future through examining theories on effectiveness of media in connection with the question of which information technology should be used in order to heighten effect of information communication appropriate to information design.

  • PDF

An Emotion Scanning System on Text Documents (텍스트 문서 기반의 감성 인식 시스템)

  • Kim, Myung-Kyu;Kim, Jung-Ho;Cha, Myung-Hoon;Chae, Soo-Hoan
    • Science of Emotion and Sensibility
    • /
    • v.12 no.4
    • /
    • pp.433-442
    • /
    • 2009
  • People are tending to buy products through the Internet rather than purchasing them from the store. Some of the consumers give their feedback on line such as reviews, replies, comments, and blogs after they purchased the products. People are also likely to get some information through the Internet. Therefore, companies and public institutes have been facing this situation where they need to collect and analyze reviews or public opinions for them because many consumers are interested in other's opinions when they are about to make a purchase. However, most of the people's reviews on web site are too numerous, short and redundant. Under these circumstances, the emotion scanning system of text documents on the web is rising to the surface. Extracting writer's opinions or subjective ideas from text exists labeled words like GI(General Inquirer) and LKB(Lexical Knowledge base of near synonym difference) in English, however Korean language is not provided yet. In this paper, we labeled positive, negative, and neutral attribute at 4 POS(part of speech) which are noun, adjective, verb, and adverb in Korean dictionary. We extract construction patterns of emotional words and relationships among words in sentences from a large training set, and learned them. Based on this knowledge, comments and reviews regarding products are classified into two classes polarities with positive and negative using SO-PMI, which found the optimal condition from a combination of 4 POS. Lastly, in the design of the system, a flexible user interface is designed to add or edit the emotional words, the construction patterns related to emotions, and relationships among the words.

  • PDF