• Title/Summary/Keyword: Hybrid Service

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A Study on Efficiency of the EPCIS using Altibase DBMS (Altibase DB를 활용한 EPCIS 효율화 방안 연구)

  • Piao, Xue-Hua;Lee, Doo-Yong;Song, Young-Keun;Kwon, Dae-Woo;Jho, Yong-Chul;Lee, Hee-Nam;Lee, Chang-Ho
    • Journal of the Korea Safety Management & Science
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    • v.12 no.2
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    • pp.167-172
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    • 2010
  • EPCIS(EPC Information Service) system is a core component of EPCglobal Architecture Framework offering information of the freights, the time of awareness and the location of awareness on the EPCglobal Network. EPCIS Repository continuously stores and manages mass EPCIS Event input data from a great number of RFID devices simultaneously. The Hybrid DBMS can deal efficiently mass necessary data. This study suggest the plan which can efficiently manage EPCIS Repository using Hybrid DBMS. We offer three schema and stores EPCIS Event data to Altibase DB that can efficiently manage EPCIS Repository using Hybrid DBMS and compare the performance about three schema through simulations.

Performance Analysis of GFSK Systems by Impulsive Electromagnetic Noise in Indoor Radio Fading Channel Environment (실내 무선 페이딩 채널 환경에서 임펄스성 전자간섭파에 의한 GFSK시스템의 성능 분석)

  • 이양선;김지웅;강희조
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.12 no.7
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    • pp.1115-1121
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    • 2001
  • In this paper, we analyzed the performance of GFSK system that presence fading effect in indoor radio communication environments and impulsive electromagnetic noise from electronic equipments then we applied the Truncated Type- II Hybrid ARQ scheme to make satisfied in data transmission service. As a result, the system was influenced by fading and impulsive electromagnetic noise. Especially, the system was much degraded by high occurrence frequency and amplitude of impulsive electromagnetic noise than fading which has direct frequency. By adopting the Truncated Type-II hybrid ARQ technique we can also obtained the performance improvement in the low signal power(20 dB) arid over 24 dB in strong impulsive electromagnetic noise environment which is occurred error floor and terribly influenced by the system.

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A Study on the Prediction Models of Used Car Prices Using Ensemble Model And SHAP Value: Focus on Feature of the Vehicle Type (앙상블 모델과 SHAP Value를 활용한 국내 중고차 가격 예측 모델에 관한 연구: 차종 특성을 중심으로)

  • Seungjun Yim;Joungho Lee;Choonho Ryu
    • Journal of Service Research and Studies
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    • v.14 no.1
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    • pp.27-43
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    • 2024
  • The market share of online platform services in the used car market continues to expand. And The used car online platform service provides service users with specifications of vehicles, accident history, inspection details, detailed options, and prices of used cars. SUV vehicle type's share in the domestic automobile market will be more than 50% in 2023, Sales of Hybrid vehicle type are doubled compared to last year. And these vehicle types are also gaining popularity in the used car market. Prior research has proposed a used car price prediction model by executing a Machine Learning model for all vehicles or vehicles by brand. On the other hand, the popularity of SUV and Hybrid vehicles in the domestic market continues to rise, but It was difficult to find a study that proposed a used car price prediction model for these vehicle type. This study selects a used car price prediction model by vehicle type using vehicle specifications and options for Sedans, SUV, and Hybrid vehicles produced by domestic brands. Accordingly, after selecting feature through the Lasso regression model, which is a feature selection, the ensemble model was sequentially executed with the same sampling, and the best model by vehicle type was selected. As a result, the best model for all models was selected as the CBR model, and the contribution and direction of the features were confirmed by visualizing Tree SHAP Value for the best model for each model. The implications of this study are expected to propose a used car price prediction model by vehicle type to sales officials using online platform services, confirm the attribution and direction of features, and help solve problems caused by asymmetry fo information between them.

Energy-Aware Traffic Engineering in Hybrid SDN/IP Backbone Networks

  • Wei, Yunkai;Zhang, Xiaoning;Xie, Lei;Leng, Supeng
    • Journal of Communications and Networks
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    • v.18 no.4
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    • pp.559-566
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    • 2016
  • Software defined network (SDN) can effectively improve the performance of traffic engineering and will be widely used in backbone networks. Therefore, new energy-saving schemes must take SDN into consideration; this action is extremely important owing to the rapidly increasing energy consumption in telecom and Internet service provider (ISP) networks. Meanwhile, the introduction of SDN in current networks must be incremental in most cases, for technical and economic reasons. During this period, operators must manage hybrid networks in which SDN and traditional protocols coexist. In this study, we investigate the energy-efficient traffic engineering problem in hybrid SDN/Internet protocol (IP) networks. First, we formulate the mathematical optimization model considering the SDN/IP hybrid routing mode. The problem is NP-hard; therefore, we propose a fast heuristic algorithm named hybrid energy-aware traffic engineering (HEATE) as a solution. In our proposed HEATE algorithm, the IP routers perform shortest-path routing by using distributed open shortest path first (OSPF) link weight optimization. The SDNs perform multipath routing with traffic-flow splitting managed by the global SDN controller. The HEATE algorithm determines the optimal setting for the OSPF link weight and the splitting ratio of SDNs. Thus, the traffic flow is aggregated onto partial links, and the underutilized links can be turned off to save energy. Based on computer simulation results, we demonstrate that our algorithm achieves a significant improvement in energy efficiency in hybrid SDN/IP networks.

A study on the Development of a Hybrid Library Model based on Information Commons (Information Commons기반 하이브리드(Hybrid)도서관 모형 개발에 관한 연구)

  • Chung, Jae-Young
    • Journal of the Korean BIBLIA Society for library and Information Science
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    • v.20 no.2
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    • pp.59-73
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    • 2009
  • The library could get infinite possibilities of the space, if people had recognized that the library was not only the space for the reading and collecting of the books but also a special space for accomplishment of the investigation, learning, communication, and culture. Also, it can be desirable way for implementing the hybrid library. It means that combine with the traditional library which is the most important thing is a real space and the digital library, in contrast, the which is that the most important thing is the cyberspace. The purpose of this study is to develop a practical model for hybrid library based on the concept of information commons which is cooperation of the space, information technology and information services. This study intends to figure out the core elements involved in operative aspect of hybrid library through comparative analysis of domestic and foreign cases applied Information commons concepts to the library.

Transmission Method and Simulator Development with Channel bonding for a Mass Broadcasting Service in HFC Networks (HFC 망에서 대용량 방송서비스를 위한 채널 결합 기반 전송 방식 및 시뮬레이터 개발)

  • Shin, Hyun-Chul;Lee, Dong-Yul;You, Woong-Shik;Choi, Dong-Joon;Lee, Chae-Woo
    • Journal of Broadcast Engineering
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    • v.16 no.5
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    • pp.834-845
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    • 2011
  • Massive broadcasting contents such as UHD(Ultra High Definition) TV which requires multi-channel capacity for transmission has been introduced in recent years. A transmission scheme with channel bonding has been considered for transmission of massive broadcasting contents. In HFC(Hybrid Fiber Coaxial) networks, DOCSIS 3.0(Data Over Cable Service Interface Specification 3.0) has already applied channel bonding schemes for up/downstream of data service. A method unlike DOCSIS 3.0 is required to introduce a channel bonding scheme in the broadcasting service having unidirectional transmission with a downstream. Since a massive broadcasting content requires several channels for transmission, VBR(Variable Bit Rate) transmission has been emerging for the bandwidth efficiency. In addition, research on channel allocation and resource scheduling is required to guarantee QoS(Quality of Service) for the broadcasting service based on VBR. In this paper, we propose a transmission method for mass broadcasting service in HFC network and show the UHD transmission simulator developed to evaluate the performance. In order to evaluate the performance, we define various scenarios. Using the simulator, we assess the possibility of channel bonding and VBR transmission for UHD broadcasting system to provide mass broadcasting service efficiently. The developed simulator is expected to contribute to the efficient transmission system development of mass broadcasting service.

The ASK_a Service Model for Public Library in Korea (우리나라 공공도서관의 ASK_a 서비스 모형 개발)

  • Nam, Young-Joon;Lee, Hyang-Sook
    • Journal of Information Management
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    • v.37 no.1
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    • pp.57-81
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    • 2006
  • The new service of Korean public library, ASK_a service model suggests a new management practice in collaborative digital reference services. The model has three functions: input transaction, process transaction, and output transaction. The best form for input is the web form. The best form for process is a model with a hybrid type of public libraries(hierarchical and lateral type). The output suggests the archiving policy for gathering the query-answer data. The core of this model is providing an advanced information service to its users through cooperation with public libraries and external manpower.

A Flexible Handover Scheme for Supporting Seamless Real-Time Services in Wireless Network (무선망에서 끊김 없는 실시간 서비스 제공을 위한 유연성 있는 핸드오버 기법)

  • Cho, Sung-Hyun;Pakr, Sung-Han
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.37 no.1
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    • pp.23-31
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    • 2000
  • In this paper, we propose an adaptive handover scheme in wireless network. The proposed handover scheme is a hybrid type of virtual path extension and rerouting. The proposed handover scheme chooses the virtual path management scheme according to the service QoS instead of the network topology which is used in the previous hybrid handover schemes. The proposed scheme supports the seamless service and small buffering during virtual path rerouting handover through the multicasting service. To evaluate the performance of the proposed scheme, we computed the number of signaling message used for handover and perform computer simulation. The simulation results show that the proposed scheme provides more efficiency in the handover delay and seamless service than the previous methods.

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Determination of the Optimal Location for Water Treatment Plants in the Decentralized Water Supply System (분산형 용수공급시스템 구축을 위한 정수처리시설 최적 위치 결정)

  • Chang, Dong-Eil;Ha, Keum-Ryul;Jun, Hwan-Don;Kim, Jeong-Hyun;Kang, Ki-Hoon
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.1
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    • pp.1-10
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    • 2013
  • Major issues in water supply service have changed from expansion of service area to improvement of service quality, i.e., water quality and safety, and early response to emergency situation. This change in the service concept triggers the perceptions of limitation with the current centralized water supply system and of necessities of decentralized (distributed) water supply system (DWSS), which can make up the limitations. DWSS can reduce the possibility of water supply outage by establishing multiple barriers such as emergency water supply system, and secure better water quality by locating treatment facilities neighboring consumers. On the other hand, fluctuation of water demand will be increased due to the reduced supply area, which makes difficult to promptly respond the fluctuating demand. In order to supplement this, hybrid water supply system was proposed, which combined DWSS with conventional water supply system using distributing reservoir to secure the stability of water supply. The Optimal connection point of DWSS to existing water supply network in urban area was determined by simulating a supply network using EPANET. Optimal location of decentralized water treatment plant (or connection point) is a nodal point where changes in pressure at other nodal points can be minimized. At the same time, the optimal point should be selected to minimize hydraulic retention time in supply network (water age) to secure proper water quality. In order to locate the point where these two criteria are satisfied optimally, Distance measure method, one of multi-criteria decision making was employed to integrate the two results having different dimensions. This methodology can be used as an efficient decision-support criterion for the location of treatment plant in decentralized water supply system.

Estimation of optimal position of a mobile robot using object recognition and hybrid thinning method (3차원 물체인식과 하이브리드 세선화 기법을 이용한 이동로봇의 최적위치 추정)

  • Lee, Woo-Jin;Yun, Sang-Seok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.6
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    • pp.785-791
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    • 2021
  • In this paper, we propose a methodology for estimating the optimal traversable destination from the location-based information of the object recognized by the mobile robot to perform the object delivery service. The location estimation process is to apply the generalized Voronoi graph to the grid map to create an initial topology map composed of nodes and links, recognize objects and extract location data using RGB-D sensors, and collect the shape and distance information of obstacles. Then, by applying the hybrid approach that combines the center of gravity and thinning method, the optimal moving position for the service robot to perform the task of grabbing is estimated. And then, the optimal node information for the robot's work destination is updated by comparing the geometric distance between the estimated position and the existing node according to the node update rule.