• 제목/요약/키워드: Context Information Service

검색결과 958건 처리시간 0.034초

동질적 특징추출을 이용한 상황예측 구조의 설계 (A Design of Context Prediction Structure using Homogeneous Feature Extraction)

  • 김형선;임경미;임재현
    • 인터넷정보학회논문지
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    • 제11권4호
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    • pp.85-94
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    • 2010
  • 본 논문은 사용자가 이동하려는 위치를 사전에 예측하고 예측된 정보를 이용하여 사용자 서비스를 미리 제공할 수 있도록 하는 위치예측 구조를 제안한다. 제안한 구조는 7개의 단계를 거쳐 사용자의 위치예측 및 지능화된 서비스를 제공하도록 한다. 물리적 센서와 히스토리 데이터베이스로부터 수집된 상황정보는 이질적인 데이터 형태를 갖기 때문에 이로 인한 데이터의 중요도 및 추상화 과정에 어려움이 있다. 이에 본 논문은 데이터의 유형을 동질적인 형태로 바꾸어 특징 추출을 하는 위치 예측구조를 제안한다. 추출된 값은 SOFM을 통해 군집화하고 ARIMA를 통해 미리 사용자의 위치 정보를 얻으며, 추론 엔진을 거쳐 최종 서비스를 실현한다. 제안된 위치예측 구조의 검증을 위해 테스트베드를 구축하고 시나리오에 따라 실험한다.

태그의 문맥 정보를 이용한 웹 자원 추천 시스템 (Tag Based Web Resource Recommendation System)

  • 송제인;정옥란
    • 인터넷정보학회논문지
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    • 제17권6호
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    • pp.133-141
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    • 2016
  • 최근의 여러 웹서비스에서는 태깅 기능을 제공함으로써 사용자가 작성하는 게시물의 주제를 표현하도록 유도하고 있다. 태그를 이용하면 글이나 사진에 대한 글쓴이의 감정과 같은 문맥적인 정보의 효과적인 추출이 가능하기 때문에, 기계적인 방식보다 글의 내용에 대해서 더 나은 의미 파악이 가능하다. 따라서 이를 추천시스템에 적용한다면 사용자의 만족도를 높일 수 있는 추천이 가능할 것이다. 본 논문에서는 게시글에 속한 태그들 간의 관계를 계산하고, 효율적인 유사도 측정 알고리즘을 통해 게시글과 사용자등의 웹 자원을 추천하는 방법을 제안한다. 마지막으로, 실험을 통해 제안한 방법의 유효성을 검증하고, 사용자의 만족도를 측정하였다.

공공도서관에서의 에듀넷을 이용한 교육정보봉사 (The EDUNET in Public Libraries: Educational Information Services)

  • 김달곤
    • 한국비블리아학회지
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    • 제8권1호
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    • pp.97-116
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    • 1997
  • In the so-called “information society,”the information service function of public libraries is gaining an increasing importance. In order to meet the growing demand for educational information, the Korean government established the Center for Educational Multimedia Research and Development and opened in 1996 the EDUNET as a comprchensive educational information network. In this context, public libraries as social education institutions are expected to provide educational information services by utilizing the EDUNET information resources. The availability of EDUNET will even increase when the librarians assist users with systematic information search services, and digitalize printed materials in the library. For this purpose, it is necessary for them to accommodate new information technologies and, thereby, to raise the level of information services up to that of their users’needs by enhancing the librarians’expertise in helping users search information effectively. In this end, we suggest a financial decision be made to build an oversea educational information exchange system.

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A Framework for measuring query privacy in Location-based Service

  • Zhang, Xuejun;Gui, Xiaolin;Tian, Feng
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제9권5호
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    • pp.1717-1732
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    • 2015
  • The widespread use of location-based services (LBSs), which allows untrusted service provider to collect large number of user request records, leads to serious privacy concerns. In response to these issues, a number of LBS privacy protection mechanisms (LPPMs) have been recently proposed. However, the evaluation of these LPPMs usually disregards the background knowledge that the adversary may possess about users' contextual information, which runs the risk of wrongly evaluating users' query privacy. In this paper, we address these issues by proposing a generic formal quantification framework,which comprehensively contemplate the various elements that influence the query privacy of users and explicitly states the knowledge that an adversary might have in the context of query privacy. Moreover, a way to model the adversary's attack on query privacy is proposed, which allows us to show the insufficiency of the existing query privacy metrics, e.g., k-anonymity. Thus we propose two new metrics: entropy anonymity and mutual information anonymity. Lastly, we run a set of experiments on datasets generated by network based generator of moving objects proposed by Thomas Brinkhoff. The results show the effectiveness and efficient of our framework to measure the LPPM.

U-마켓에서의 사용자 정보보호를 위한 매장 추천방법 (A Store Recommendation Procedure in Ubiquitous Market for User Privacy)

  • 김재경;채경희;구자철
    • Asia pacific journal of information systems
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    • 제18권3호
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    • pp.123-145
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    • 2008
  • Recently, as the information communication technology develops, the discussion regarding the ubiquitous environment is occurring in diverse perspectives. Ubiquitous environment is an environment that could transfer data through networks regardless of the physical space, virtual space, time or location. In order to realize the ubiquitous environment, the Pervasive Sensing technology that enables the recognition of users' data without the border between physical and virtual space is required. In addition, the latest and diversified technologies such as Context-Awareness technology are necessary to construct the context around the user by sharing the data accessed through the Pervasive Sensing technology and linkage technology that is to prevent information loss through the wired, wireless networking and database. Especially, Pervasive Sensing technology is taken as an essential technology that enables user oriented services by recognizing the needs of the users even before the users inquire. There are lots of characteristics of ubiquitous environment through the technologies mentioned above such as ubiquity, abundance of data, mutuality, high information density, individualization and customization. Among them, information density directs the accessible amount and quality of the information and it is stored in bulk with ensured quality through Pervasive Sensing technology. Using this, in the companies, the personalized contents(or information) providing became possible for a target customer. Most of all, there are an increasing number of researches with respect to recommender systems that provide what customers need even when the customers do not explicitly ask something for their needs. Recommender systems are well renowned for its affirmative effect that enlarges the selling opportunities and reduces the searching cost of customers since it finds and provides information according to the customers' traits and preference in advance, in a commerce environment. Recommender systems have proved its usability through several methodologies and experiments conducted upon many different fields from the mid-1990s. Most of the researches related with the recommender systems until now take the products or information of internet or mobile context as its object, but there is not enough research concerned with recommending adequate store to customers in a ubiquitous environment. It is possible to track customers' behaviors in a ubiquitous environment, the same way it is implemented in an online market space even when customers are purchasing in an offline marketplace. Unlike existing internet space, in ubiquitous environment, the interest toward the stores is increasing that provides information according to the traffic line of the customers. In other words, the same product can be purchased in several different stores and the preferred store can be different from the customers by personal preference such as traffic line between stores, location, atmosphere, quality, and price. Krulwich(1997) has developed Lifestyle Finder which recommends a product and a store by using the demographical information and purchasing information generated in the internet commerce. Also, Fano(1998) has created a Shopper's Eye which is an information proving system. The information regarding the closest store from the customers' present location is shown when the customer has sent a to-buy list, Sadeh(2003) developed MyCampus that recommends appropriate information and a store in accordance with the schedule saved in a customers' mobile. Moreover, Keegan and O'Hare(2004) came up with EasiShop that provides the suitable tore information including price, after service, and accessibility after analyzing the to-buy list and the current location of customers. However, Krulwich(1997) does not indicate the characteristics of physical space based on the online commerce context and Keegan and O'Hare(2004) only provides information about store related to a product, while Fano(1998) does not fully consider the relationship between the preference toward the stores and the store itself. The most recent research by Sedah(2003), experimented on campus by suggesting recommender systems that reflect situation and preference information besides the characteristics of the physical space. Yet, there is a potential problem since the researches are based on location and preference information of customers which is connected to the invasion of privacy. The primary beginning point of controversy is an invasion of privacy and individual information in a ubiquitous environment according to researches conducted by Al-Muhtadi(2002), Beresford and Stajano(2003), and Ren(2006). Additionally, individuals want to be left anonymous to protect their own personal information, mentioned in Srivastava(2000). Therefore, in this paper, we suggest a methodology to recommend stores in U-market on the basis of ubiquitous environment not using personal information in order to protect individual information and privacy. The main idea behind our suggested methodology is based on Feature Matrices model (FM model, Shahabi and Banaei-Kashani, 2003) that uses clusters of customers' similar transaction data, which is similar to the Collaborative Filtering. However unlike Collaborative Filtering, this methodology overcomes the problems of personal information and privacy since it is not aware of the customer, exactly who they are, The methodology is compared with single trait model(vector model) such as visitor logs, while looking at the actual improvements of the recommendation when the context information is used. It is not easy to find real U-market data, so we experimented with factual data from a real department store with context information. The recommendation procedure of U-market proposed in this paper is divided into four major phases. First phase is collecting and preprocessing data for analysis of shopping patterns of customers. The traits of shopping patterns are expressed as feature matrices of N dimension. On second phase, the similar shopping patterns are grouped into clusters and the representative pattern of each cluster is derived. The distance between shopping patterns is calculated by Projected Pure Euclidean Distance (Shahabi and Banaei-Kashani, 2003). Third phase finds a representative pattern that is similar to a target customer, and at the same time, the shopping information of the customer is traced and saved dynamically. Fourth, the next store is recommended based on the physical distance between stores of representative patterns and the present location of target customer. In this research, we have evaluated the accuracy of recommendation method based on a factual data derived from a department store. There are technological difficulties of tracking on a real-time basis so we extracted purchasing related information and we added on context information on each transaction. As a result, recommendation based on FM model that applies purchasing and context information is more stable and accurate compared to that of vector model. Additionally, we could find more precise recommendation result as more shopping information is accumulated. Realistically, because of the limitation of ubiquitous environment realization, we were not able to reflect on all different kinds of context but more explicit analysis is expected to be attainable in the future after practical system is embodied.

OSGi 프레임워크 기반 상황인지형 스마트 철도 건널목 안전관리시스템 (Context-Aware Smart Railroad Crossing Safety Management System based on OSGi Framework)

  • 이승현;장경수;류상환;신동렬
    • 한국인터넷방송통신학회논문지
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    • 제10권6호
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    • pp.169-177
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    • 2010
  • 철도는 다양한 분야에서 이용되며, 현재 많은 인원과 물류를 운송할 수 있는 효과적이고 친환경적인 교통수단이다. 근래에 들어 지하철을 비롯한 철도에 사고는 인명피해 및 물적 사고로 대부분 인재에 속하며, 이를 방지하기위한 안전 대책을 강구하는 방안이 추진 중이다. 본 논문에서는 철도 건널목 사고 예방을 위한 시스템의 개발을 목적으로 열차의 상황정보를 기반으로 기본적인 철도 건널목 안전관리시스템의 확장뿐만 아니라, 시스템 측면에서도 유연성을 제공할 수 있는 OSGi 프레임워크 기반 상황인지형 스마트 철도 건널목 안전 관리시스템을 구현하는 것을 목적으로 한다.

동일한 주파수 대역을 사용하는 무선기기가 측위 정확도에 미치는 영향 (A Study on Effects of Wireless Devices using Similar Frequency for Location Determination Precision)

  • 장정환;장청윤;권혁철;이광수;이창호
    • 대한안전경영과학회지
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    • 제16권4호
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    • pp.305-311
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    • 2014
  • Recently, though it was developed several services using the context-awareness technology of IoT, there exist also obstacles for high quality service. Specifically it is short the study for uncertainty of context-awareness. This study focused on understanding the effect of frequency interference among several environmental factors for location determination to increase precision of location determination. It was found that frequency interference between devices using 2.4Ghz frequency effect on the location determination precision. It was resulted that frequency interference increase the error of location determination precision. Then, we confirmed that it was required the suitable compensation method corresponding to frequency interference.

u-Home 환경에서 멀티센서 기반 u-Care System 구현 (Implementation of u-Care System Based on Multi-Sensor in u-Home Environment)

  • 이희정;강신재;장형근;정창원;주수종
    • 인터넷정보학회논문지
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    • 제12권2호
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    • pp.135-147
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    • 2011
  • 최근 독거노인의 수가 점차 증가함에 따라, 독거노인들의 안전을 위한 시스템이 요구되며, 현재 일부 관련 서비스가 시범운영중이다. 이러한 시스템은 다양한 센서를 이용한 실내위치추적기술을 기반으로 독거노인의 행위에 대한 모니터링 서비스를 제공한다. 그러나 대부분의 시스템들이 고가의 인프라가 요구되는 독거노인에게 부착된 태그나 모바일 디바이스를 통해서 서비스가 제공되고 있다. 따라서 본 논문에서는 이러한 문제점을 개선한 홈 환경의 저가의 센서들로 부터 수집된 이벤트 데이터를 기반으로 하는 시스템을 제시하고자 한다. 본 시스템의 주요 특징으로 서비스 수행 결과를 웹 브라우저를 통해 실시간 모니터링하고, 관련 상황정보를 휴대폰 문자메시지를 통해 보호자 및 헬스케어 관련자에게 제공한다.

단말기간 직접통신(Device-to-Device) 기반 4G 이동통신 서비스 발굴 및 비즈니스 모델 개발 방법론 (Development of Service Use Cases and Business Models for 4G Mobile Communications Based on Device-to-Device Communications)

  • 오슬기;류승완;박세권;신동천;김이강
    • 한국IT서비스학회지
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    • 제11권2호
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    • pp.339-353
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    • 2012
  • Mobile communication technology is advancing forward to deliver more connected devices and richer content and applications. The number of subscriptions continues to grow along with an explosive increase in the mobile data traffic demand. Thereby, it creates a significant network capacity shortage concerns for mobile network operators. In order to address this problem, it is essential to increase the network capacity at a low additional cost. The device-to-device (D2D) communication based proximity service is believed to have a promising future mobile communication technology that is capable to create new mobile service opportunities and offload traffic to the eNB. In addition, it is also required to develop new mobile communication services and its business models not only to accommodate the increasing mobile traffic demand but also to foster profitability of mobile business service providers such as the network providers, contents providers and platform providers. In this article, we first analyze current mobile business eco-system in the context of CPNT based value chain. Then, propose service development framework and business model creation methodologies for the device-to-device communication based services in the beyond LTE/LTE-Advanced systems.

국가기록원 기록정보센터의 열람서비스 제공 절차 및 특징에 관한 질적 연구 (A Qualitative Study on the Procedures and Characteristics of reading service Provision at Center of Archival Information of National Archives of Korea)

  • 남윤아;임진희
    • 기록학연구
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    • 제50호
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    • pp.177-229
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    • 2016
  • 기록정보 서비스는 기록관리의 궁극적인 목적이자 결과이며, 기록의 수요와 기록물을 연결시키는 일련의 활동들을 의미한다. 기록물의 지적요구를 정보공개 절차를 통해 제공하는 것은 국민의 알 권리 보장과 기록정보 수요에 능동적으로 대응하기 위함이다. 이를 위해서 열람프로세스의 원활한 수행을 위해 청구인 기록물 검색도구 및 열람제공자라는 속성들의 조화로운 순환이 선행되어야 정보공개의 질적 향상을 기대할 수 있다. 이에 따라 본 연구는 첫째, '열람서비스'에 영향을 미치는 요인과 특징에 관한 현상을 밝힘으로써 열람서비스 프로세스의 현안과 실제를 내부적 관점에서 제시하고 둘째, 기록물 청구 및 검색과 제공의 과정에서 열람제공자-청구인-검색도구-기록물 간의 긴밀한 상호작용에 관한 현상을 보여주며 셋째, 국가기록원 열람 프로세스 현안을 중심으로 총체적인 통합 검색도구에 관한 필요성을 제안하며 넷째, 열람제공자에게 실무적 측면에서의 기록정보 활용에 대한 이해를 제공하고 다섯째, 열람제공자의 인식과 태도에 따라 정보제공 품질에 주요한 차이를 보인다는 것을 시사하는 데 있다.