유비쿼터스 컨버젼스 IP 기반 대용량 네트워크에서 비용 절감형 리모트-서브스크립션 기법

신수영,윤영묵,박수현,Shin, Soo-Young,Yoon, Young-Muk,Park, Soo-Hyun 한국정보처리학회 2007 정보처리학회논문지 C : 정보통신,정보보안 Vol.14 No.1

TV, 비디오 스트림과 같은 이동성 멀티미디어 서비스는 3세대 이상의 이동통신(IMT-2000)에서 점차 중요한 위치를 차지하고 있다. 멀티미디어 통신은 해를 거듭할수록 그 수요가 늘어가고 IP 기술이 멀티미디어와 같은 대용량 트래픽의 효과적인 전송을 담당할 수 있는 방법으로 고려되면서 그 입지가 견고해 지고 있다. IP 기반의 IMT 네트워크 플랫폼은 IMT-2000으로부터 진화한 것이다. 유비쿼터스 플랫폼으로서의 IP 기반의 IMT 네트워크의 구조는 세 부분으로 나누어진다. 먼저 네트워크 제어 플랫폼(NCPF)과 서비스 제공 플랫폼(SSPF)을 포함한 미들웨어와 IP 백본(IB-BB), 마지막으로 센서 네트워크를 포함하는 접속 네트워크이다. 이동성관리(MM) 구조는 라우팅 정보와 지역정보를 따로 관리하기 위해 NCPF 내에 정의되었고 현재 IP 기반 IMT 네트워크에서 일반적으로 사용하고 있는 멀티캐스트 관리 기법은 리모트-서브스크립션이다. 하지만 리모트-서브스크립션은 멀티캐스트 트리의 송신자가 다른 네트워크 장소를 이동한 경우 모든 멀티캐스트 트리를 다시 생성해야 하는 문제를 가지고 있다. 이 문제를 해결하고자 본 논문에서는 NCPF 내부에 멀티캐스트 매니저를 두는 방안을 제안한다. Mobile multimedia services such as TV-call or video streaming are gradually becoming popular in the 3rd or more generation mobile network (IMT-2000). Multimedia traffic is expected to continue increasing into the coming years, and IP technology is considered to be the efficient way of transporting such huge volumes of multimedia traffic. IP-based IMT network platform represents an evolution from IMT-2000. The structure of IP-based IMT network as ubiquitous platform is three-layered model : Middleware including Network Control PlatForm (NCPF) and Service Support PlatForm (SSPF), IP-BackBone (IP-BB), access network including sensor network. Mobility Management (MM) architecture in NCPF is proposed for IP-based IMT network in order to manage routing information and location information separately. The generous existing method of multicast control in IP-based IMT network is Remote Subscription. But Remote Subscription has problem that should be reconstructed whole multicast tree when sender in multicast tree moves to another area. To solve this problem, we propose the way to put Multicast-manager in NCPF.

기혼가구의 생애 첫 주택 소유 과정

신수영,윤정숙,Shin, Soo-Young,Yoon, Chung-Sook 한국주거학회 2011 한국주거학회 논문집 Vol.22 No.1

The purpose of this study is to explore cohort changes in first-time homeownership in Korea. The study collected qualitative data from individual interviews to explore the housing trajectories of different birth cohorts. As a result, Individual interviews facilitated an exploration of the decision making process of first-time homeowner with in a cohort context. The cohorts born in the 1950s seek a sense of security through homeownership, and have strong Korean sentiments of ownership. They tried various means to buy a house, and real estate market boom at that time played a role in the driving force. The cohorts born in the 1960s have less insecurity of tenure than the previous cohorts, but they still feel the need for homeownership. Since the currency crisis in 1997 caused the fluctuation of housing price, the 1960s cohort experienced a dramatic decline and rebound of assets while the previous cohorts had experienced a steady rise in housing prices. Finally, the attitude towards housing in the group of 1970s cohorts has changed from ownershiporiented to use-oriented.

IP기반의 IMT망에서의 페이징기법연구

신수영,정병화,박수현,Shin, Soo-Young,Jung, Byeong-Hwa,Park, Soo-Hyun 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.4

[ $IP^2$ ] (IP-based IMT Network Platform) is a ubiquitous platform supporting mobility using two step If address IPha (IP host address) and IPra (IP routing address) - in a backbone network. MN (Mobile Node) in $IP^2$ maintains either Active or Dormant state, which is transferred to Active state through Paging process when communication is required. In this paper, we proposed a Paging method using proxy to resolve the problem of the conventional Paging method which transmits the Paging messages to all cells in LA (Location Area) resulting in the excessive use of network resources. Performanceevaluation of the proposed method using NS-2 showed that the usage of network resources becomes more efficient by reducing paging loads, especially under the condition of increased nodes.

Rosary : CDN 시스템을 위한 구조화된 토폴러지-인식 P2P 오버레이 네트워크

신수영,남궁정일,박수현,Shin Soo-Young,Namgoong Jung-ll,Park Soo-Hyun 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.12B

최근 CAN, Chord, Pastry와 Tapestry 등과 같이 안전한 분산 시스템기반의 P2P (Peer to Peer) 오버레이 네트워크가 일반화되고 있다. 이러한 시스템은 효율적이고 결함에 허용적인 라우팅과 개체의 위치추정 및 스스로 초기화시킬 수 있는 오버레이 네트워크가 갖는 로드 밸런싱을 제공한다. CDN (Contents Delivery Network)온 네트워크 하부구조의 중간 단계로서 궁극적으로 CP(Contents Provider)가 고객에게 전달하고자하는 멀터미디어 데이터를 포함한 컨텐츠의 효율적인 전송을 돕는다. 본 논문에서는 CDN에 적합한 토폴로지-인식 P2P 오버레이 네트워크를 새롭게 제안하였다. 제안된 기법인 Rosary에서 CDN 서버는 구조화된 오버레이 네트워크상에서 두 단계의 Inter-pastry와 Intra-pastry 라우팅을 수행한다. Rosary는 기존의 Pastry 기법을 CDN 환경에 맞도록 적응적으로 수정, 보완 및 추가하였으며 언급한 Intra-pastry 방식과 동적인 랜드마크 토폴로지 기법에 기반을 둔 세미-해싱방법을 제공하고 토폴로지-인식 오버레이 네트워크의 구성과 운용에 이용되었다. NS-2를 이용한 시뮬레이션에서 Rosary 기법은 네트워크 구성 후 안정화 된 컨텐츠 전송에서 보다 전송실패가 적고 효율적이며 견고한 것으로 증명되었다. Recently, Peer-to-Peer (P2P) overlay networks like CAN, Chord, Pastry and Tapestry offer a novel platform for scalable and decentralized distributed applications. These systems provide efficient and fault-tolerant routing, object location, and load balancing within a self-organizing overlay network. Content Delivery Network (CDN) is an intermediate layer of infrastructure that helps to efficiently deliver the multimedia content from content providers to clients. In this paper, We propose a topology-aware P2P overlay network for CDN, Rosary, in which CDN servers perform Intra-Pastry and Inter-Pastry routing based on a two-level structured overlay network. This proposed system extends pastry by adapting itself to CDN environments, where a semi-hashing based scheme for Intra-Pastry routing is introduced, and dynamic landmark technology is used to construct the topology-aware overlay network. Through simulations on NS-2, it is shown that Rosary is scalable, efficient, and flexible.

IEEE 무선랜에서 부분적인 큐 정보를 이용한 적응적인 MAC 스케쥴링 기법

신수영,장영민,Shin Soo-Young,Jang Yeong Min 한국통신학회 2004 韓國通信學會論文誌 Vol.29 No.11B

IEEE 802.l1b에서는 기본서비스인 DCF와 QoS를 제공하기 위한 무경쟁 서비스인 PCF가 제공된다. DCF는 CSMA/CA(충돌을 회피하는 매체 접속 기법) 접속 프로토콜을 사용한다. 본 논문에서는 PCF를 수정하여 트래픽의 부하가 많아진 채널에 가충치를 두어 서비스하는 기법을 제시하였다. 스테이션 측으로부터 부분적인 큐의 정보를 받아 가중치를 계산하였으며 NS-2 시뮬레이터를 사용하여 PCF 기법을 수정한 기법의 우수성을 검증하였다. In the IEEE 802.1 Ib, DCF provides contention based services and PCF provides contention free services for QoS suppof. DCF uses CSMA/CA (Carrier Sense Multiple Access/collision Avoidance) as an access protocol. In this paper, an enhanced PCF, which gives weights to channels with heavy traffic load, was proposed. The weight is depending on the partial queue length information from STAs. NS-2 simulation results show that the proposed scheme is an promising approach for enhancing the PCF.

IEEE 802.11x Wireless LAN에서 불균형한 트래픽 부하에 적응적인 폴링 기법

신수영,박수현,Shin Soo-Young,Park Soo-Hyun 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.3

Every MAC (Medium Access Control) sub-layers of IEEE 802.11x, including IEEE 802.11e, defines Connection-based and CF (Contention Free)-based service functions in common. In this paper, a New-CF method is proposed. In the proposed method, conventional Round Robin method, which is used as a polling method by IEEE 802.11x PCF (Point Coordination Function) or IEE 802.11e HCCA, is modified to give weights to channels with heavier traffic load and to provide those weighted channels with more services. Based on NS-2 simulations, it is verified the proposed method shows better throughput in general, particularly under unbalanced traffic load conditions. IEEE 802.11e를 포함한 IEEE 802.11x의 모든 매체접속제어 부계층은 형태는 다르지만 공통적으로 CP(Contention Period)와 CFP(Contention Free Period) 서비스 기능을 정의하고 있다. 본 논문에서는 현재 여러IEEE 802.11x PCF나 IEEE 802.11e HCCA 상에서 서비스되고 있는 기존 라운드로빈 방식의 폴링 기법을 수정하여 트래픽의 부하가 큰 채널을 선택하여 가중치를 주어 서비스할 수 있는 New-CF 방식을 제안하였다. NS-2로 기존 기법과의 비교를 수행한 시뮬레이션 결과 전체적인 통과율이 상승한 것을 검증하였다.

중국 동북부 제민족의 주거형태 및 주생활 특성

신수영,윤정숙,Shin Soo-Young,Yoon Chung-Sook 한국주거학회 2004 한국주거학회 논문집 Vol.15 No.6

In the North-eastern districts of China, Northern races inherited and developed their own cultural traditions. The housing of northeastern China has been changed under the influence of environment. Some tribes' housings has been developed, keeping their own peculiar style, while others have divested of their ethnic flavor. To understand these aspects of development, this study focused on the housings in Heilongjiang and Nei Monggol. As for the procedure, this study referred to the literature and carried out a field trip at the same time. The housing of northeastern China has undergone the process to fix their residence after the life of migration in common. In this process, northeastern hosing has changed variously and can be grouped into the several types by shape and material. From the point of view about living pattern, some important living features are extracted by the types.

IEEE 802.11b 무선랜에서 트래픽 부하에 따른 적응적인 PCF MAC 스케줄링 기법

신수영(Soo-Young Shin),장영민(Yeong-Min Jang),강신각(Shin-Gak Kang) 대한전자공학회 2003 대한전자공학회 학술대회 Vol.2003 No.11

구성원의 목표성향이 행동 및 성과에 미치는 영향

신수영(Soo Young Shin),박원우(Won Woo Park) 한국경영학회 2013 經營學硏究 Vol.42 No.1

Along with rapid changes in managerial environments, goal orientation has emerged as a theme in organizational research because of its self-regulating function. This study investigates how goal orientation influences task behavior and job performance, with a focus on the mechanisms of the sub-dimensions of goal orientation. While previous studies have emphasized the positive effect of learning orientation on academic and job performance, this paper examines the independent mechanisms of performance orientation based on VandeWalle`s 1997 study. Dividing performance orientation into performance-proving orientation and avoiding-failure orientation allows for a more detailed explanation of the mechanisms of goal orientation. This study examines how learning orientation and performance-proving orientation influence job performance. Particular emphasis is placed analyzing different types of task behavior, such as proactive behavior and self-presentation behavior. We expect that understanding these task behaviors will shed light on the relationship between mental characteristics and workplace outcomes. We investigate the following hypothesis: H1.1: Emlpoyees` learning orientation will be positively related to their proactive behavior. H1.2: Emlpoyees` performance-proving orientation will be positively related to their self-presentation behavior. H2.1: Emlpoyees` proactive behavior will be positively related to their job performance. H2.2: Emlpoyees` self-presentation behavior will be negatively related to their job performance. Data were collected using questionnaires distributed to employees and their coworkers within nine different organizations located in South Korea. A total of 155 supervisor-subordinate dyads were used for the statistical analysis. To examine the main effect, structural equation analysis(AMOS 18) was used. As predicted, results confirmed that member`s goal orientation positively influenced task behavior supporting hypothesis 1.1 and 1.2. Although not hypothesized, the cross relationship between learning orientation and self-presentation behavior, performance-proving orientation and proactive behavior was not significant. Furthermore, member`s proactive behavior positively influenced job performance, however, member`s self-presentation behavior was not associated with job performance. The results of this study have important theoretical and practical implications. First, the main effects of learning orientation were significant only through proactive behavior. That is, not only learning orientation but also presenting proactive behavior is important in job performance. In addition, performance-proving orientation can affect job performance itself, but induced self-present behavior has no relationship with job performance. These findings show that the mediating role of task behavior is relevant to understanding the goal orientation mechanism. The present study shows each mechanism of goal orientation independently. However, this study did not identify methods for enhancing performance-prove orientation on job performance. Future research needs to investigate the positive mechanism of performanceprove orientation, in addition to the learning orientation as considered in the present and previous studies.

수중음파통신을 위한 적응형 매체접속기법

신수영(Soo Young shin),박수현(Soo Hyun Park),김창화(Chang Hwa Kim) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.06