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      • SCIESCOPUS

        A Hybrid Channel Access Scheme for Coexistence Mitigation in IEEE 802.15.4-Based WBAN

        Kim, Beomseok,Choi, Jong-Hyeon,Cho, Jinsung IEEE 2017 IEEE SENSORS JOURNAL Vol.17 No.21

        <P>Wireless body area network (WBAN) is a communication technology, which aims providing both medical and consumer electronics services through sensor devices in, on, or around a human body. Due to the absence of the IEEE802.15.6-based RF modules, the IEEE 802.15.4, a typical low-power communication technology of which requirements are similar, is considered to implement WBANs. In the case where a lot of WBANs coexist, meanwhile, collisions and signal attenuations may lead to their communication performance degradation. However, the IEEE 802.15.4 does not provide any solutions to solve coexistence problems, and thus, coexistence mitigation schemes for the IEEE 802.15.4-based WBANs are necessary. In this paper, we perform preliminary experiments to identify aspects of coexistence problem among the coexisting IEEE 802.15.4-based WBANs. Based on the results of preliminary experiments, we also propose a hybrid channel access scheme to mitigate coexistence problems in WBANs. The proposed scheme can be classified into two phases. In the first phase, the proposed scheme provides probabilistic collision avoidance on the contention-free period. When the pre-defined requirements of reliability cannot be satisfied with performing the first phase, the proposed scheme performs the second phase, which helps to mitigate collision or interference through changing channel access method. To evaluate the performance of the proposed scheme, we implement our scheme and perform experiments by comparing with an IEEE 802.15.4-based WBAN.</P>

      • SCISCIESCOPUS

        Active isochronous resource manager for intense dynamic resource allocation service with IEEE1394

        Jung, Gi-Hoon,Kang, Soon-Ju IEEE 2005 IEEE transactions on consumer electronics Vol.51 No.2

        With the increased use of various audio/video style digital consumer appliances in home networks, the concurrent support of multiple multimedia streaming services is also clearly required in a home network. Although the isochronous transaction of IEEE 1394 is the best solution for such streaming services, the current IEEE 1394 standard specifications do not consider the dynamic management of isochronous bandwidth resources or a dynamic allocation service for isochronous resources. Accordingly, this paper presents an architecture for an isochronous resource management service that can support an intense dynamic allocation service in an IEEE 1394-based home network environment. The proposed isochronous resource manager service is also implemented using an IEEE 1394 device driver for RTLinux.

      • SCISCIESCOPUS

        Design of Home Network Gateway for Real-Time A/V Streaming between IEEE1394 and Ethernet

        Hyo-Moon Jeong,Myung-Jin Lee,Dong-Kyu Lee,Soon-Ju Kang IEEE 2007 IEEE transactions on consumer electronics Vol.53 No.2

        <P>For practical multimedia streaming services in home networks, seamless binding between two stream formats (digital video (DV) and MPEG-4), on two heterogeneous protocols (IEEE 1394 and Ethernet), is required. IEEE 1394 is the best way for the real-time transmission of high bandwidth audio/video (A/V) content inside a home, and Ethernet provides a connection to anywhere, not only in homes, but also outside by using wired or wireless mobile solutions, however, because of differences between the two stream solutions (DV-IEEE 1394 and MPEG-4-Ethernet), an appropriate device or function is needed between the two parts. In this paper, the software and hardware architecture of a media gateway are suggested in order to solve the problems. First, hardware architecture was designed to support transcoding functions between DV and MPEG-4 in real-time. It also solves resource limitations between two protocols and related devices such as bandwidth and quality factors. Suggested software architecture coordinates the heterogeneity of transaction management and addressing mechanisms between two protocols. Based on the design requirements of the proposed system, we implemented a prototype media gateway based on the proposed architecture and the performance was evaluates being successful.</P>

      • SCISCIESCOPUS

        Notice of Violation of IEEE Publication Principles<br>Ontology-based semantic recommendation system in home network environment

        Jinhyung Kim,Dongwon Jeong,Doo-kwon Baik IEEE 2009 IEEE transactions on consumer electronics Vol.55 No.3

        <P>Home network is one of the predominant applications in ubiquitous computing. In home network environment, we need semantic recommendation system for exact and abundant information recommendation to users. For semantic recommendation system, we construct ontology for user profiles and home network services firstly in this paper. In addition to, we suggest recommendation method for ontology-based semantic recommendation. By using the suggested system, we can support more precise and richer information recommendation.</P><P>Notice of Violation of IEEE Publication Principles 'Ontology-based Semantic Recommendation System in Home Network Environment' by Jinhyung Kim, Dongwon Jeong and Doo-kwon Baik in the IEEE Transactions on Consumer Electronics, Vol 55, No. 3, August 2009, pp. 1178-1184 After careful and considered review of the content and authorship of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE's Publication Principles. This paper contains text and figures that have been copied from the paper cited below. The original text was copied without attribution (including appropriate references to the original author(s) and/or paper title) and without permission. Due to the nature of this violation, reasonable effort should be made to remove all past references to this paper, and future references should be made to the following article: 'Applying User Profile Ontology for Mining Web site Adaptation Recommendations' by Tarmo Robal and Ahto Kalja in the Proceedings of the 11th East-European Conference on Advances in Databases and Information Systems (ADBIS 2007), pp. 126-135 </P>

      • SCISCIESCOPUS

        Design and performance evaluation of in-home high throughput streaming service with ethernet and IEEE1394

        Gi-Hoon Jung,Soon-Ju Kang IEEE 2009 IEEE transactions on consumer electronics Vol.55 No.4

        <P>This paper introduces a design of the optimized in-home multi-session streaming server and presents a performance evaluation of high throughput multi-session streaming service with Ethernet and IEEE1394. The in-home streaming server is a kind of personal home server or residential gateway, however it is specialized for in-home multi-session streaming and distribution of multimedia contents. In order to realize this server, two specific features should be in harmony with each other: the multi-stream transcoder to support various presentation constraints of the multimedia client devices and the multi-session streaming interface to transfer multiple high-throughput streams concurrently. In particular, the network interface should absorb the throughput tolerance caused by the concurrent stream-converting processes to maximize the multi-streaming capability of the server with a limited transcoder performance. Hence, this paper evaluates the streaming performance of the two major network protocols, gigabit Ethernet and IEEE1394a, in order to understand their adequateness for the in-home multi-session streaming service.</P>

      • SCISCIESCOPUS

        Real-time bandwidth management middleware for multi-session isochronous streaming service in the IEEE1394-based home network

        Gi-Hoon Jung,Hwa-Young Chae,Soon-Ju Kang IEEE 2009 IEEE transactions on consumer electronics Vol.55 No.2

        <P>In order to support a multi-session multimedia streaming service in home networks, many critical problems must be considered. In particular, handling the shortage of network bandwidth is one of the most significant and complicated problems. In this paper, a real-time streaming management middleware named as RTSM middleware is suggested as a solution to the problem regarding the IEEE1394-based home network. In order to handle the shortage of network bandwidth and enhance the bus utilization rate, the proposed middleware combines two methods. First, the bandwidth management function measures the usage rate of network bandwidth and restores the residual bandwidth, which is excessively occupied by a streaming service, to free bandwidth. Second, the isochronous streaming (IS) scheduler manages all streaming services in a network according to a priority-based preemptive scheduling policy. This paper focuses on explaining the necessity of bandwidth management in home networks and describing the prototype architecture of the proposed middleware. Evaluation result will show the potential possibility of the proposed middleware.</P>

      • SCISCIESCOPUS

        A consumer transceiver for long-range IoT communications in emergency environments

        Kim, Minhyuk,Chang, Sekchin IEEE 2016 IEEE transactions on consumer electronics Vol.62 No.3

        <P>As an emerging technology, IoT enables a machine-to-machine connectivity without a network infrastructure. Therefore, IoT is strongly considered a technology for communications in emergency environments. Especially, a WiFi protocol is under standardization as IEEE802.11ah for IoT-based long-range communications. However, the service range is not enough to cover a communication area in emergency situations. This paper addresses a consumer transceiver for long range communications of IoT in emergency environments. The transceiver is based on IEEE802.11ah WiFi protocol which is under standardization for low-cost and low-power services. In this paper, a novel architecture for the transceiver is proposed in order to increase the service range of IEEE802.11ah, which is necessary for the long-range IoT communication of emergency messages in emergency situations. Experimental results show that the presented architecture is suitable for the long-range IoT communication of emergency alert messages(1).</P>

      • SCISCIESCOPUS

        Distributed Fair Scheduling for Wireless Mesh Networks Using IEEE 802.11

        Janghwan Lee,Hyunsoo Yoon,Ikjun Yeom IEEE 2010 IEEE Transactions on Vehicular Technology VT Vol.59 No.9

        <P>In IEEE-802.11-based wireless mesh networks (WMNs), unfair bandwidth sharing may arise, because the carrier sense multiple access with collision avoidance protocol is designed to provide per-station fairness only in one hop. As the hop count from a mobile client to the gateway node increases, the throughput of the node drastically decreases. In this paper, we propose a fair bandwidth allocation scheme for multiradio multichannel WMNs. This scheme provides fair bandwidth sharing among the nodes in a WMN, regardless of their hop distance from the gateway node. To achieve fairness, we first estimate the number of active nodes attached to each router and calculate the effective weights of routers based on the estimation. Then, we differentiate their contention window using their weights. For this method, we derive a multihop packet collision model. The proposed scheme is fully distributed and does not require any global information. Through an extensive simulation study, we show that our scheme ensures per-node fairness without loss of the total aggregate throughput.</P>

      • A Floating-Point Unit for 4D Vector Inner Product with Reduced Latency

        Kim, Donghyun,Kim, Lee-Sup IEEE 2009 IEEE Transactions on Computers Vol.58 No.7

        <P>This paper presents the algorithm and implementation of a new high-performance functional unit for floating-point four-dimensional vector inner product (4D dot product; DP4), which is most frequently performed in 3D graphics application. The proposed IEEE-compliant DP4 unit computes {\rm Z} = {\rm AB} + {\rm CD} + {\rm EF} + {\rm GH} in one path and keeps the intermediate rounding by IEEE-754 rounding to nearest even. The intermediate rounding is merged with shift alignment, and intermediate carry-propagated addition and normalization are omitted to reduce latency in the proposed architecture. The proposed DP4 unit is implemented with 0.18-\mu{\rm m} CMOS technology and has 12.8-ns critical path delay, which is reduced by 45.5 percent compared to a previous DP4 implementation using discrete multipliers and adders. The proposed DP4 unit also reduces the cycle time of 3D graphics applications by 12.4 percent on the average compared to the usual 3D graphics FPU based on four-way multiply-add-fused units.</P>

      • SCISCIESCOPUS

        Video streaming exploiting multiple-antenna techniques of wirelessMAN-advanced systems

        Jeongsik Yun,Sanghyun Bak,Nulibyul Kim,Kwanghoon Choi,Jaekwon Kim IEEE 2012 IEEE transactions on consumer electronics Vol.58 No.3

        <P>In this paper, a novel video streaming technique is proposed for the recently standardized IEEE802.16m system also known as the Wireless MAN-Advanced or WIMAX2 system. The antenna mode considered is single user spatially multiplexed (SUSM) transmission suitable for video streaming. In previous works, the linear signal detection method was used in order to achieve unequal error protection (UEP). In this paper, it is shown that a joint signal detection method can also be used to achieve UEP. Computer simulations demonstrate improved performance using the proposed method. In the simulations, H.264/AVC compressed video is used, and the PHY layer procedures such as resource unit allocation, convolutional turbo code (CTC), pilot tone insertion, and pre-coding are implemented in strict accordance with the IEEE 802.16m standard.</P>

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