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Search Results: 1 - 10 of 2796 matches for " Sik Yoon "
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An Ubiquitous Service Mobility Mechanism in the Cross Domain Service Framework  [PDF]
Jung-Sik Sung, Jongmoo Sohn, Yoon-Sik Yoo, Jaedoo Huh
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.531103
Abstract: Service mobility has become a new issue in the area of service convergence with the advent of versatile mobile devices. Hence, we propose an open service framework with support for service mobility that executes contents and applications in a dynamic environment. For the framework, the concept and role of a device and its application for a service are redefined into the new concepts of device, execution engine, and service. Mechanisms for device profiling, user preference learning, and profile-based service recommendation are designed to enable device-capability-aware service recommendation functionality. Furthermore, a seamless service syndication mechanism is added for continuity and synchronization of service upon change of terminal, network status, or personal preference. A prototype system integrates functionalities with proprietary protocol and a content transcoder to support multiple device platforms. The prototype shows the capability of the framework in service mobility support and its advancement into an open international application platform.
SIP-based Service and Device Portability Across OSGi Domains
Faisal Adeem Siddiqui,Won-Sik Yoon
Information Technology Journal , 2005,
Abstract: As Open Services Gateway Initiative (OSGi) is getting widespread industry support, there is a need for service and device portability across OSGi domains. This will enable the users in one OSGi environs to enjoy the same services when they locomote to other OSGi environs. Users will have access to services not only on their personal devices like mobile phones, PDAs, laptops etc. but also on any available device at the visiting location. We propose a novel architecture for this service and device portability across OSGi domains based on the Session Initiation Protocol (SIP). We outline the requirements and investigate how SIP meets these requirements while other solutions miscarry. Next, we present a lightweight SIP-Agent service in OSGi to enable service and device portability across OSGi domains of home, vehicle and mobile devices. We elaborate by giving example scenarios and SIP message flows based on OSGi reference architecture. Our OSGi enabled SIP-Agent service can either be the part of the framework or can be downloaded like any other OSGi service.
Data Aggregation with Error Correction for Wireless Sensor Networks
Qiang Ma,Won-Sik Yoon
Information Technology Journal , 2005,
Abstract: In-network aggregation as a power-efficient mechanism for collecting data in wireless sensor networks has been emphasized with the development of other WSN network protocols. In this study, we firstly propose a general architecture to seamlessly integrate data aggregation into wireless sensor networks and then present one error correction algorithm for data aggregation by exploiting the inherent correlations that exist between sensor nodes. This approach is orthogonal to other works and thus can work complementally to enhance the reliability of aggregation algorithms
Immunolocalization of Ephexin-1 in the Developing Canine Cerebellum  [PDF]
Hyun Sik Park, In Youb Chang, Han Yong Kim, Sang Pil Yoon
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51002
Abstract:

Ephexin-1 functions as guanine nucleotide exchange factors for the Rho-type GTPases which have important roles in neuronal development including axon guidance, migration, morphogenesis, and plasticity of neurons. As little is known about ephexin-1 in the cerebellum, we investigated the immunolocalization of ephexin-1 in the developing canine cerebellum. While the cellular maturation was followed by the temporal pattern, the calbindin D-28k and ephexin-1 immunoreactivities gradually increased in developing canine cerebellum. When compared to the calbindin D-28k immunoreactivities, belated ephexin-1 immunolocalization was observed in the Purkinje cells which aligned a single layer during cerebellar development. These results suggest that ephexin-1 might play an important role in the development of the Purkinje cells during the first two postnatal weeks based on its immunolocalization in the present study.

Multi-level Clustering Architecture for Wireless Sensor Networks
Yulin He,Won-Sik Yoon,Jai-Hoon Kim
Information Technology Journal , 2006,
Abstract: Recently wireless sensor networks have received increasing attention from the research community. One of the key design challenges in wireless sensor network is conserving the sensor nodes= energies, so as to maximize their lifetime. Clustering technique has proved to be a fundamental mechanism to increases network lifetime and scalability. This study was proposed a novel distributed clustering approach to organize the sensors in a wireless sensor network into clusters. Based on this algorithm, generate a multi-level clustering architecture in a top-down fashion and observe that the energy consumption decrease with the number of levels in the hierarchy. Numerical analysis was also given on the basis of the result from stochastic geometry.
The Study of Location Strategy for Bank through the Analysis of Inter-regional Financial Transaction Network
Hong Jae Weon,Hong Won Eui,Kwak Yoon Sik
International Journal of u- and e- Service, Science and Technology , 2010,
Abstract: In this paper, authors attempt to shed light on the factors that influence the locations of bank branches in establishing a bank’s branch network from the angle of the network analysis. For this purpose, authors studied location strategy for bank through the analysis of inter-regional network using financial transaction data in Korea. The previous studies analyzed the locations of bank branches on the basis of their geographical characteristics.But, the significance of this study rests upon the fact that it endeavors to explore the location factors from a new perspective of the movement path of financial customers. For this analysis, the network between administrative districts, which form the unit of a location, was analyzed based on the financial transactional data. The important findings of this study are as follows. First, we found the factors that the income level, the spending level, the number ofbusinesses, and the size of workforce in the pertinent region were influence to the size of a bank’s market. Second, the network centrality index was found to have a significant effect on the locations of bank branches. The degree centrality was revealed to have a greater influence on the size of a bank’s market than does the closeness centrality. The results of this study suggest the needs for a new approach from the perspective of network in furtherance of other factors that have been considered important in the previous studies of the branch location strategies.
Effects of High EGR Rate on Dimethyl Ether (DME) Combustion and Pollutant Emission Characteristics in a Direct Injection Diesel Engine
Seung Hyun Yoon,Seung Chul Han,Chang Sik Lee
Energies , 2013, DOI: 10.3390/en6105157
Abstract: This study investigated the effects of high exhaust gas recirculation (EGR) rates on dimethyl ether (DME) fuel combustion performance, exhaust emissions and particle emission characteristics in a small direct injection diesel engine under various injection timings. To examine the effect of EGR and injection timings, the experiment was performed under high EGR rates (0%, 30%, 50%) and injection timings were varied from 40° before top dead center (BTDC) to top dead center (TDC) of the crank angle to examine the effects of early injection of DME fuel. The combustion pressures and heat release rates for different EGR rates followed similar trends. As the injection timing was advanced, the indicated mean effective pressure (IMEP) differed little in response to EGR rate in the range from TDC to 25° BTDC, and more for crank angles beyond 25° BTDC. DME combustion exhibited very little soot emission, but soot emission increased slightly with EGR rate. The use of high EGR during combustion produced very low NO x concentrations but increased HC and CO emissions for advanced injection timings from 25° BTDC to 40° BTDC. The use of EGR increased both the emissions of total particle number and particle volume over the whole range of the injection timings; for all cases, total particle volume decreased as injection timing was advanced.
Observing photonic de Broglie waves without the NOON state
Osung Kwon,Young-Sik Ra,Yoon-Ho Kim
Physics , 2009, DOI: 10.1103/PhysRevA.81.063801
Abstract: The photonic de Broglie wave, in which an ensemble of $N$ identical photons with wavelength $\lambda$ reveals $\lambda/N$ interference fringes, has been known to be a unique feature exhibited by the photon number-path entangled state or the NOON state. Here, we report the observation of the photonic de Broglie wave for a pair of photons, generated by spontaneous parametric down-conversion, that are not photon number-path entangled. We also show that the photonic de Broglie wave can even be observed for a pair of photons that are completely separable (i.e., no entanglement in all degrees of freedom) and distinguishable. The experimental and theoretical results suggest that the photonic de Broglie wave is, in fact, not related to the entanglement of the photons, rather it is related to the indistinguishable pathways established by the measurement scheme.
Co-evolution of Selection and Influence in Social Networks
Yoon-Sik Cho,Greg Ver Steeg,Aram Galstyan
Computer Science , 2011,
Abstract: Many networks are complex dynamical systems, where both attributes of nodes and topology of the network (link structure) can change with time. We propose a model of co-evolving networks where both node at- tributes and network structure evolve under mutual influence. Specifically, we consider a mixed membership stochastic blockmodel, where the probability of observing a link between two nodes depends on their current membership vectors, while those membership vectors themselves evolve in the presence of a link between the nodes. Thus, the network is shaped by the interaction of stochastic processes describing the nodes, while the processes themselves are influenced by the changing network structure. We derive an efficient variational inference procedure for our model, and validate the model on both synthetic and real-world data.
Technical Report: A New Multi-Device Wireless Power Transfer Scheme Using an Intermediate Energy Storage Circuit
Changseok Yoon,Sung Sik Nam,Sung Ho Cho
Computer Science , 2013,
Abstract: A new multi-device wireless power transfer scheme that reduces the overall charging time is presented. The proposed scheme employs the intermediated energy storage (IES) circuit which consists of a constant power driving circuit and a super-capacitor. By utilizing the characteristic of high power density of the super-capacitor, the receiver can receive and store the energy in short duration and supply to the battery for long time. This enables the overlap of charging duration between all receivers. As a result, the overall charging time can be reduced.
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