• The Journal of the Korea Contents Association
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• v.8 no.12
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• pp.37-44
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• 2008

Data entered into RFID tags are used for saving costs and enhancing competitiveness in the development of applications in various industrial areas. RFID readers perform the identification and search of hundreds of objects, which are tags. RFID technology that identifies objects on request of dynamic linking and tracking is composed of application components supporting information infrastructure. Despite their many advantages, existing applications, which do not consider elements related to real.time data communication among remote RFID devices, cannot support connections among heterogeneous devices effectively. As different network devices are installed in applications separately and go through different query analysis processes, there happen the delays of monitoring or errors in data conversion. The present study implements a RFID database handling system in semantic Web environment for integrated management of information extracted from RFID tags regardless of application. Users’ RFID tags are identified by a RFID reader mounted on an application, and the data are sent to the RFID database processing system, and then the process converts the information into a semantic Web language. Data transmitted on the standardized semantic Web base are translated by a smart browser and displayed on the screen. The use of a semantic Web language enables reasoning on meaningful relations and this, in turn, makes it easy to expand the functions by adding modules.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.9
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• pp.17-26
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• 2011

Many types of services appear in a ubiquitous environment promulgated by the evolution of web service technology with the advances in wireless network technologies and mobile computing devices. These services differ according to their location environments, such as home, office, airport, and exhibition. It is required that a different set of services dynamically drops into the mobile user's device depending on their context and the distributed localized services are efficiently managed to seamlessly provide these localized services to the user. This paper proposes an Autonomic Service Composition System (ASCS) to provide useful services to the user with minimal or no effort for service selection. ASCS seamlessly installs the programs of localized services in the user's mobile device. It automatically provides localized services to users that are in the local service zone. Also ASCS can manage distributed localized services remotely and efficiently. ASCS is composed of a Remote Manager, Service Gateway, and Mobile Device. The prototype implementation uses 802.11b Wireless Network and Bundles using the OSGi Framework.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.12C
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• pp.1251-1264
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• 2002

Currently, audio streaming services such as on-demand service and live service support only a limited number of clients. They also suffer from a lack of stability and degradation of service quality due to their inefficient use of network resources. Futhermore, since the streaming services usually do not consider dynamic services, they are very inconvenience to use. In order to resolve these drawbacks, we propose a novel audio streaming system based on MPEG-2 AAC file format which are facilitated with the network bandwidths efficiently. The proposed system supports QoS for audio streaming as well as guarantees a stability while streaming service is undergoing. Moreover, the system provides a dynamic interface which enables us to use the streaming service more easily and to manage streaming servers with convenient manner. On the contrary, most of the current available static interface streaming services are mainly depending only on a single fixed web page between client and server, which in consequence lead us to use unflexible static service environment. Our implementation results show the proposed system improves the performance compared to those of the currently existing systems that use MP3 file format. It also provides some benefits such as a stability of service and a easy to management of streaming servers.

• Journal of Intelligence and Information Systems
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• v.17 no.2
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• pp.39-60
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• 2011

Since the introduction of web 2.0 technology, social network service has been recognized as the foundation of an important future information technology. The advent of web 2.0 has led to the change of content creators. In the existing web, content creators are service providers, whereas they have changed into service users in the recent web. Users share experiences with other users improving contents quality, thereby it has increased the importance of social network. As a result, diverse forms of social network service have been emerged from relations and experiences of users. Social network is a network to construct and express social relations among people who share interests and activities. Today's social network service has not merely confined itself to showing user interactions, but it has also developed into a level in which content generation and evaluation are interacting with each other. As the volume of contents generated from social network service and the number of connections between users have drastically increased, the social network extraction method becomes more complicated. Consequently the following problems for the social network extraction arise. First problem lies in insufficiency of representational power of object in the social network. Second problem is incapability of expressional power in the diverse connections among users. Third problem is the difficulty of creating dynamic change in the social network due to change in user interests. And lastly, lack of method capable of integrating and processing data efficiently in the heterogeneous distributed computing environment. The first and last problems can be solved by using FOAF, a tool for describing ontology-based user profiles for construction of social network. However, solving second and third problems require a novel technology to reflect dynamic change of user interests and relations. In this paper, we propose a novel method to overcome the above problems of existing social network extraction method by applying FOAF (a tool for describing user profiles) and RSS (a literary web work publishing mechanism) to OLAP system in order to dynamically innovate and manage FOAF. We employed data interoperability which is an important characteristic of FOAF in this paper. Next we used RSS to reflect such changes as time flow and user interests. RSS, a tool for literary web work, provides standard vocabulary for distribution at web sites and contents in the form of RDF/XML. In this paper, we collect personal information and relations of users by utilizing FOAF. We also collect user contents by utilizing RSS. Finally, collected data is inserted into the database by star schema. The system we proposed in this paper generates OLAP cube using data in the database. 'Dynamic FOAF Management Algorithm' processes generated OLAP cube. Dynamic FOAF Management Algorithm consists of two functions: one is find_id_interest() and the other is find_relation (). Find_id_interest() is used to extract user interests during the input period, and find-relation() extracts users matching user interests. Finally, the proposed system reconstructs FOAF by reflecting extracted relationships and interests of users. For the justification of the suggested idea, we showed the implemented result together with its analysis. We used C# language and MS-SQL database, and input FOAF and RSS as data collected from livejournal.com. The implemented result shows that foaf : interest of users has reached an average of 19 percent increase for four weeks. In proportion to the increased foaf : interest change, the number of foaf : knows of users has grown an average of 9 percent for four weeks. As we use FOAF and RSS as basic data which have a wide support in web 2.0 and social network service, we have a definite advantage in utilizing user data distributed in the diverse web sites and services regardless of language and types of computer. By using suggested method in this paper, we can provide better services coping with the rapid change of user interests with the automatic application of FOAF.

• Information and Communications Magazine
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• v.31 no.5
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• pp.39-45
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• 2014

기업활동에서 IT에 대한 의존도가 증가함에 따라 기업들은 다양한 소프트웨어 및 하드웨어 플랫폼에서 제공되는 서비스들을 운영하고 있다. 서비스들이 보급, 확대되는 과정에서 새로운 보안 취약점들이 나타나고, 이들 취약점을 악용한 기업정보의 유출 및 해킹 등 보안사고의 발생도 비례하여 증가하고 있다[1]. 특히 다양한 유형의 사업을 운영하는 지주회사 또는 대기업 그룹사의 경우, 사업영역별로 운영 중인 IT 인프라의 보안 취약점이 네트워크로 연결된 타 사업용 IT 인프라에 대한 사이버 침해의 통로로 악용될 가능성이 있다. 이 같은 문제의 해결을 위해 기업들은 사업영역 별로 보유한 IT 인프라의 보안 취약점 진단과 대응을 위한 솔루션들을 도입, 운영해 오고 있다. 하지만 기업의 보안 거버넌스 관점에서 보안 취약점 관리도 전사적인 보안 정책과의 연계 강화, 투자 중복의 방지, 효과적인 관리와 통제에 대한 필요성이 대두되기 시작했다. 보안 거버넌스 체계 강화에 대한 기업의 요구변화에 맞춰 보안 취약점의 통합관리를 지원하는 상용 솔루션들이 일부 출시되고 있으나 기업들이 기 운영하고 있는 개별 취약점 진단 솔루션과의 연동, 로그관리 및 기업이 요구하는 특화된 기능 구현 등의 어려움이 도입에 장애가 되고 있다. 따라서, 대기업을 중심으로 개별 보안 취약점 진단 솔루션들을 연동하여 기업보안 거버넌스를 효과적으로 지원할 수 있도록 취약점 관리업무 프로세스의 재설계와 함께 취약점 진단 통합관리 체계를 구축하고 있다[2][3][4]. 본고는 보안 취약점 관리업무의 문제점을 소개하고, 최근 대 기업을 중심으로 활발히 구축이 추진되고 있는 웹 기반의 취약 점 진단 통합관리 체계의 개념, 기능 및 운영 프로세스를 소개한다. 아울러, 기업 IT 인프라에 대한 보안 취약점 진단 데이터를 축적하여 기업 내부의 보안위험 요소를 사전예측하고, 정보보호의 투자 대비 효과(ROSI: Security Return on Investment)를 효과적으로 산정하는 인프라로서 활용 가치를 소개한다.

• Journal of Korea Multimedia Society
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• v.2 no.1
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• pp.1-8
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• 1999

To provide information service with time constraints, it is required to support real-time information system for retrieval and update of distributed information. In this paper, we propose an information retrieval system model for internet. We design and implement a Domain Administration-Oriented search engine for the regional information network. Accordingly, an intelligent robot gathering and updating distributed information is implemented. And, in order to improves the performance of the system, a realtime robot control policy based on the loads of network and web server is proposed.

• Proceedings of the Korean Information Science Society Conference
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• 2004.10c
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• pp.478-480
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• 2004

네트워크의 발달로 인하여 지역적으로 원거리에 위치한 다수의 사용자들이 공동 작업을 수행할 수 있는 다양한 기술들이 개발되었다. 공동작업을 지원하는 협업시스템은 HTTP 프로토콜을 사용하거나 또는 각자의 고유한 통신 프로토콜들을 정의하여 구현하였다. 이러한 방법은 협업시스템 간의 상호 운용성이 결여되는 문제를 발생시켰다. W3C의 IETF에서는 협업지원을 위한 WebDAV 명세가 발표되었다. WebDAV는 웹상의 공동 저작활동을 지원하기 위한 표준프로콜로서, 원거리에 있는 사용자들 간에 인터넷상의 파일을 편집하고 관리할 수 있도록 해주는 HTTP의 확장이다. 이를 이용하여 협업시스템을 구성하면 협업시스템 간의 상호 운용성을 높일 수 있을 것이 다. 협업시스템의 클라이언트는 협업지원 서버의 자원들을 효율적으로 이용할 수하고 팀원들 간의 상호작용이 원활 하게 이루어 져야한다. 이러한 요구 조건을 고려하여 본 논문에서는 WebDAV 프로토콜을 이용한 협업시스템의 클라이언트를 설계하였다. 고급기능으로 사용자가 협업지원 서버의 파일을 편집할 때 자동으로 저작프로그램을 연결하고 저작프로그램을 종료할 때 파일의 변화된 내용과 파일의 버전관리를 실시간으로 서버에 적용될 수 있게 디자인하였다. 또한 드래그앤드롭(Drag & Drop)을 통한 파일이동을 지원하고 파일의 읽기모드와 쓰기모드를 지원하는 기능을 설계하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.3
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• pp.781-793
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• 2010

Recently, owing to the development of ubiquitous sensor network and mobile communication technologies, many studies on healthcare system are being carried out. In this paper, we have designed and implemented a mobile u-Healthcare system based on sensor network. The u-Healthcare system is composed of three components: wireless sensor network at home, healthcare center located at remote site, and gateway which relays sensing physiological signals to healthcare center. In order to measure patient's physiological signal three sensors are used: three channel ECG sensor, pulse oximeter, and blood pressure sensor. Each sensor is mounted on a mote which can send gathered signal to the base node using Zigbee communication protocol. Once the base node receives physiological signal from each sensor, the client in the base node transfers the signal to the healthcare center. The received physiological signal at the healthcare center is analyzed and processed using various algorithms. The processed results are compared to the standard healthcare database and appropriate treatment including dietetics and exercise cure would be sent to the patient as feedback using SMS message or healthcare center web site. Each patient can check and manage one's health state every day using the healthcare system and gain a recovery under the treatments from minor health problems.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.8 no.6
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• pp.141-146
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• 2008

Recently, it is studying to provide to users through internet in the SensorWeb of OGC(Open Geospatial Consortium) saving and maintaining data and image information gathered from sensor network. It is necessary to study about data convergence as binding audio and video for delivering the sensing data and image information to users with real-time system. In this article, it suggests how to convergence sensing data and moving picture collected from the sensor network using index. This program indicates both of them that collected sensing data and information identified of moving picture in the integration index and based on this program provides sensing data moving picture at the same time referencing integration index, if the user asks. To verify suggested method designing real-time multimedia service structure using sensor network and image installation and implementing Ubiquitous realtime multimedia system integrating moving picture and sensing data based on index. As a result of this program, it is confirmed providing real-time multimedia service to request information of application service using integration index collected image and sensing data from wireless sensor network and image installation suggested data convergence method.

• The Journal of the Korea Contents Association
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• v.10 no.6
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• pp.106-114
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• 2010

Recently, with the development of network technology, the web-based remote control systems and the real time remote control systems that do not have any restrictions at any time and space are many developed in the several industry FA field. In this paper, we developed the graphic editor screen of the client PC (PDA) with wireless network and the real time remote control system that can access the industry's server and can control the transmission of data for the FA of iron and steel industry field. Implementation of this system brought on the several effects of the decrease of the worker's movement, the control of quick equipments, a step-up in production efficiency, and the decrease of maintenance expense and so on in administration side of industry field.