• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.7
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• pp.1621-1630
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• 2009

There is a lot of recent research to provide services of dynamic distributed contents in P2P-based distributed environment. Distributed services of contents objects, however, have problems in QoS and dynamic management of segments. This paper proposed a new segment management method for the service of P2P-based distributed contents. The proposed method manages groups by the SGM(Segment Group Manager). The SGM manages streaming efficiently by the grouping of segments to be served in P2P environment. The segments in the same group cooperate for improved QoS using the management structure based on the distance and relationship. The distance-based management structure is for the improvement of retrieval efficiency while the relationship-based management structure is for the improvement of service ratio. The simulation results of the proposed method showed improvements in average transmission efficiency and average service rate. The improvement is 8% - 30% in average transmission efficiency and 10% - 30% in average service rate.

• Proceedings of the Korean Information Science Society Conference
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• 2003.10a
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• pp.805-807
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• 2003

인터넷 환경의 발달이 기업 내부까지 깊숙이 파고들어 기업 내의 각종 시스템 환경에 새로운 패러다임을 만들고 있다. 이러한 시스템의 활용적인 측면 뿐 아니라 보안적 관리도 중요해지면서 다양한 보안 시스템과 서비스가 내부 네트워크에서 운영되고 있다. 그래서 이 논문에서는 대기업을 모델로 하여 DNS(Domain Name System), 방화벽(Firewall), 침입 탐지 시스템(IDS)에 대하여 현 이용 실태를 파악해 보고, 각각의 개선 방향을 찾아본다.

• Journal of Korean Society of Forest Science
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• v.100 no.4
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• pp.650-663
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• 2011

The purpose of this study was to investigate the satisfaction of service quality for seasonal visitors of Korea National Arboretum using Importance-performance analysis. Data were obtained from visitors of Korea National Arboretum on spring, summer, autumn. Results of analysis showed that all season visitor's satisfaction was high. The IPA was undertaken with total 24 variables about service quality of arboretum. Results of IPA was founded that summer visitors want to improve some services (information facilities, forest museum, conveniences, etc). Autumn visitors, on the other hand, thought that some services (kindness, active responsiveness, variety of plant, etc) are overinvested. As a results, there is differences between importance and satisfaction about seasonal service quality.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2007.02a
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• pp.97-100
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• 2007

본 논문은 유비쿼터스 센서 네트워크와 텔레매틱스 서비스에 사용되는 무선 환경 프로토콜 표준 중 UHF 대역 프로토콜인 EPCglobal의 Class 1 Gen 1, Class 1 Gen 2의 에어인터페이스를 분석하고 각 프로토콜에서 규정된 충돌방지 알고리즘을 구현하였다. 그리고 각 프로토콜에서 규정하는 충돌방지 알고리즘의 성능을 개선한 알고리즘을 제안하고 성능을 비교하였다. 개선된 알고리즘과 표준 알고리즘의 성능 시뮬레이션 결과 개선된 Class 1 Gen 1 알고리즘은 태그 수 100개 일 때 54.5%, 태그 수 1000개 일 때 63.4% 감소하였다. 개선된 Class 1 Gen 2 알고리즘은 태그 수 100개 일 때 7.9%, 태그 수 1000개 일 때 11.7% 감소하였다. 개선된 충돌방지 알고리즘은 표준 알고리즘보다 태그 인식 성능이 상당히 개선됨을 알 수 있다. 따라서 개선된 충돌방지 알고리즘은 유비쿼터스 센서 네트워크와 텔레매틱스 서비스 등에 사용되는 무선인식 시스템의 성능 개선방안으로 적용될 수 있다.

• Journal of Digital Convergence
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• v.11 no.10
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• pp.217-224
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• 2013

Due to the development of mobile technologies, the carrier (telecommunications) billing service market is rapidly growing. carrier (telecommunications) billing service allows users to make on-line purchases through mobile-billing. Users find this particularly convenient because the payment acts as a credit transaction. Furthermore, the system is commonly believed to be secure through its use of SMS (Short Message Service) authentication and a real-time transaction history to confirm the transaction. Unfortunately, there is a growing number of fraudulent transactions threaten the future of this system. The more well documented types of security breaches involves hackers intercepting the authentication process. By contaminating the device with security breaching applications, hackers can secretly make transactions without notifying users until the end of month phone bill. This study sheds light on the importance of this societal threat and suggests solutions. In particular, "secure" systems need to be more proactive in addressing the methods hackers use to make fraudulent transactions. Our research partially covers specific methods to prevent fraudulent transactions on carrier billing service providers' systems. We discuss about the proposed improvements such as complement of electronic payment systems, active promotion for fraudulent transactions enhanced monitoring, fraud detection and introduce a new authentication service. This research supports a future of secure communications billing services, which is essential to expanding new markets.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2014.10a
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• pp.387-389
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• 2014

It is preferred to the popularization of smart device business processes through mobile. The ratio of Internet access via mobile devices is reached 30% of PC in September 2012. It is reproduced in a mobile environment that security threats arising from the Internet. that is the characteristics of cyber security threats appearing on the mobile era. Web Application Service security research firm OWASP (The Open Web Application Security Project) issued Session Management threat. That threat will be reproduced in the mobile environment. But Mobile is significantly different from Desktop Computer about Session Management environment. This proceeding proposes a improved Session Management method in Mobile environment.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.5
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• pp.1249-1259
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• 1998

This paper proposes an efficient channel assignment method for real-time service in the IEEE 802.11 Wireless LAN system, and analyzes the supportability to real-time service and the channel utilzation of that through computer simulations. The improved MAC(Medium Access Control) protocol employing the proposed channel assignment method achieved good throughput over contention period as well as contention-free period by making real-time terminals transmit the information about their desiring value before starts of data transmissions. For performance evaluation of the proposed method, a simulation analyzing the variation of allocated bandwidths to terminals using real-time service and their buffer sizes wasexecuted. Real-time data traffics was modeled s 7-stae transition VBR sources, and asynchronous data traffics modeled as Poisson processes. In the simulation, the proposed method showed smaller variation of the bandwidth of each terminal and samller buffer size than the existing method, and also recorded good throughput over contention period.

• The KIPS Transactions:PartA
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• v.10A no.4
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• pp.419-424
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• 2003

Every CP has its own contents classification system for charging. Currently most classification system is based on the CPID and Service ID of the WAP. An service ID from a common CPID pool is provided to CP for each service. Then charges are computed for each service ID. But in this system CPID range must be changed whenever the CP adds a new service. Therefore all CPIDs of the existing services must be updated. Another problem is that when a CP provides several services, it has multiple CPIDS. Therefore with increasing number of services CPID would be exhausted in the future. In this paper, we proposes a new contents ,classification system. We remove CPID range and instead we propose a new CPID composed of a system n, service classification ID and a serial number. The new CPID is assigned to each service. By this scheme we improve the contents classification system.

• Journal of Convergence for Information Technology
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• v.9 no.1
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• pp.74-85
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• 2019

The purpose of this study was to analyze the vocational rehabilitation service environment of the mentally facilities. Focus group interview (FGI) was conducted for obtain the data. According to the interview results, first, in providing vocational rehabilitation services for people with mental illness, comprehensive services should be provided considering various needs. Second, the facilities are not recognized as vocational rehabilitation facilities for people with disabilities. Therefore, it is operated according to the regulations on mental rehabilitation facilities in the Mental Health Welfare Act. Third, they need management supports. Finally, It raised the necessity of revising laws and systems that are not systematized without reflecting reality. Based on the results of this study, some suggestions are presented.

• Proceedings of the Korea Contents Association Conference
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• 2019.05a
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• pp.327-328
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• 2019

에어비앤비, 우버택시 등과 같이 공유경제 패러다임을 반영한 새로운 차원의 서비스 비즈니스의 확산은 IT기술을 기반으로 하는 스마트 네트워크 보급에 다른 제품의 서비스화가 일반화되었기 때문이다. 공유경제라는 새로운 패러다임 하에서 제품 공유와 관련된 서비스 시스템의 디자인 응용을 연구하는 것은 갈수록 중요해지고 있으며, 공유경제를 기반으로 하는 서비스 디자인이 스마트 네트워크와 융합을 통해 자원 활용을 높이고 낭비를 줄이며, 사용자의 다양한 생활 체험과 가치 있는 수요를 보장해줄 수 있기 때문이다. 본 연구는 기존의 서비스 디자인에 관한 문헌 정리와 디자인 실무를 통해 고찰한 서비스 디자인 개념을 바탕으로, 부산을 방문하는 외국인 고객을 대상으로, 예측하기 힘든 특수한 날씨환경에서 우산 사용에 대한 사용자의 니즈와 수요를 조사하고 분석하여, 보다 개선되고 창의적인 "공유우산 서비스 디자인 모형"을 구축하고자 하였다. 이를 위하여 서비스 디자인 방법과 원칙에 따라 우산을 공유하는 서비스 시스템의 목표고객, 접점을 분석한 후, 외국인 관광객을 위한 서비스 시스템의 서비스 청사진을 만들고 우산공유 시스템 구축과 실무적용을 위한 서비스 전략을 제시할 계획이다.