Search Results:　 1-20 of 140

  • 1

    Sensor Network Topology Estimation Using Weighted Directed Graph  [in Japanese]

    Tatsuya Midorikawa , Tomoji Kishi

    近年,情報処理技術の発展とともにセンサデバイスの高機能化が進んでいる.これにより,大量のセンサを配置し環境中の情報を収集することで,実世界に於ける人間の行動を支援するアプリケーションが数多く提案されている.それに伴いセンサ機器やセンサネットワークを用いた行動推定の研究が数多く行われており,詳細な行動予測が日常生活の快適化等を実現することが期待されている.本研究では,赤外線センサを想定したセンサネッ …

    IPSJ SIG Notes 2012-SE-178(16), 1-5, 2012-10-25

    CiNii Link1

  • 2

    Dynamic Active Period Control Method achieving Low Latency and Low Energy in Multi-hop Wireless Sensor Networks  [in Japanese]

    KAI Narumi , SAKATA Shiro , KOMURO Nobuyoshi

    無線センサネットワークにおいて,省電力化は重要な課題である,センサネットワーク向けの標準通信プロトコルであるIEEE802.15.4ビーコンモードでは,BO,SOというDuty Cycleに関するパラメータを用い,同期とスリープ制御を行なっている.しかし,アプリケーションやトポロジによりトラフィック負荷が異なるため,Duty Cycleが適切でない場合,電力浪費,遅延増大が問題となる.そこで本稿で …

    IEICE technical report 112(31), 33-38, 2012-05-10

    CiNii Fulltext PDF - Limited 

  • 3

    Surface-wave analysis for identifying unfrozen zones in subglacial sediments

    Tsuji Takeshi , Johansen Tor Arne , Bent Ole Ruud , Ikeda Tatsunori , Matsuoka Toshifumi

    … We used active-source multichannel seismic data originally acquired for reflection analysis along a glacier at Spitsbergen in the Norwegian Arctic and proposed an effective approach of multichannel analysis of surface waves (MASW) in a glacier environment. … Common-midpoint crosscorrelation gathers were used for the MASW to improve lateral resolution because the glacier bed has a rough topology. …

    GEOPHYSICS 77(3), EN17-EN27, 2012-04-00

    IR CrossRef

  • 4

    Noise Canceling Balun-LNA with Enhanced IIP2 and IIP3 for Digital TV Applications

    SAEEDI Saeed , ATARODI Mgjtaba

    … An inductorless low noise amplifier (LNA) with active balun for digital TV (DTV) applications is presented. … The matching and amplifier stages in the LNA topology perform single-ended to differential signal conversion with balanced output. …

    IEICE Transactions on Electronics 95(1), 146-154, 2012-01-01

    J-STAGE CrossRef References (9)

  • 5

    A Single-phase-to-three-phase Power Converter with an Active Buffer and a Charge Circuit

    Ohnuma Yoshiya , Itoh Jun-ichi

    … The proposed topology is constructed based on an indirect matrix converter with an active buffer to decouple the power ripple. …

    IEEJ Journal of Industry Applications 1(1), 46-54, 2012

    J-STAGE CrossRef

  • 6

    Parametric Design of Five-Level Active NPC Inverter  [in Japanese]

    KASHIHARA Yugo , ITOH Jun-ichi

    … This paper describes the loss analysis and capacitor designing method for an active neutral-point-clamped (ANPC) multilevel inverter. … The ANPC circuit topology is a combination of a neutral-point-clamp circuit and flying capacitor circuit topologies. …

    IEEJ Transactions on Industry Applications 131(12), 1383-1392, 2011-12-01

    J-STAGE CrossRef References (12) Cited by (1)

  • 7

    Distribution Method of In-network Guidance Information for Inter-AS Content-Oriented Network Topology  [in Japanese]

    KAKIDA Masayuki , TANIGAWA Yosuke , TODE Hideki

    … いる.また,筆者らは,特定状況下でクエリがルータ間をループするという本方式の問題を解決した方式Breadcrumbs+(BC+)および,近隣のユーザが提供するキャッシュスペース上のキャッシュ利用を促進するための方式Active Breadcrumbs(ABC)を提案している.しかし,これらの方式は誘導経路長を制御できないため,コンテンツ到達までのホップ数が増大するクエリが発生する.本稿では,ネットワークトポロジの階層構造を利用して従来のBC …

    IEICE technical report 111(232), 115-120, 2011-10-06

    CiNii Fulltext PDF - Limited  References (14)

  • 8

    Designing a Low-phase-noise, Low-power-dissipation CMOS-Ring VOC according to a New Figure of Merit

    MOMMA Akio , OGURA Jun , NISHIMORI Eiji

    … Using the proposed FOM, we analyze the phase noise and power dissipation in an inverter-based ring oscillator, since it has a simple topology and few noise sources. … A prototype inverter-based quadrature-ring VCO was fabricated by using 0.18-μm CMOS technology with an active die area of 0.018 mm2. …

    IEEJ Transactions on Electronics, Information and Systems 131(8), 1397-1402, 2011-08-01

    J-STAGE CrossRef References (7)

  • 9

    A 0.5-6 MHz Active-RC LPF with Fine Gain Steps Using Binary Interpolated Resistor Banks

    BECK Sungho , JEONG Seongheon , MIN Sunki , HWANG Myung-Woon , KIM Stephen T. , LIM Kyutae , TENTZERIS Emmanouil M.

    … This paper proposes an active-RC filter that achieves a wide pseudo-continuous bandwidth-tuning range and a wide gain range with fine steps using a novel switched resistor architecture. … A channel-selection filter with the proposed resistor bank is designed for a multi-mode mobile-TV receiver with the 6th order Chebyshev-I topology. …

    IEICE Transactions on Electronics 94(8), 1328-1331, 2011-08-01

    J-STAGE CrossRef References (6)

  • 10

    Topology for Current Balancer with Half-Bridge Inverters in Single-Phase Three-Wire Distribution Systems with DC-Capacitor-Voltage Balancer  [in Japanese]

    BABA Yusuke , SUGAHARA Kazuya , OKAMOTO Masayuki , HIRAKI Eiji , TANAKA Toshihiko

    … This paper proposes a new topology for a current balancer with half-bridge inverters in single-phase three-wire distribution systems with a three-leg inverter. … The two half-bridge inverters perform a current balancer for single-phase three-wire distribution systems by exchanging the active and reactive power on the each feeder through the two DC-capacitors. …

    IEEJ Transactions on Industry Applications 131(7), 880-887, 2011-07-01

    J-STAGE CrossRef References (6) Cited by (1)

  • 11

    Adaptive Sensor Management Based on Spatial Correlation in Wireless Sensor Networks

    ZOGHI Mohammad Reza , KAHAEI Mohammad Hossein

    … Then, a new adaptive algorithm is proposed in which the number of active sensors is adaptively determined and the best topology of the active set is selected based on the add-one-sensor-node-at-a-time method. … Simulations results show that the active sensors selected using the proposed cost function have less event distortion. …

    IEICE Transactions on Communications 94(6), 1598-1605, 2011-06-01

    J-STAGE CrossRef References (19)

  • 12

    A Soft-Switching Active Rectifier that Uses a Magnetic Energy Recovery Switch  [in Japanese]

    ISOBE Takanori , MIYAJI Yoshitsugu , USUKI Kazuhiro , MATSUKAWA Tatsuya , SHIMADA Ryuichi

    … Converters using active switches can improve the harmonic components of input current and the power factor. … In this study, we propose a new active rectifier circuit topology that can reduce the switching losses and EMI by soft-switching operation. …

    IEEJ Transactions on Industry Applications 131(6), 793-800, 2011-06-01

    J-STAGE CrossRef References (6)

  • 13

    Proposal on ECO-friendly Distributed Routing Protocol Considering Route Redundancy  [in Japanese]

    ARAI Daisuek , MOTEGI Shinji , DOKI Suguru , YOSHIHARA Kiyohito

    インターネットのトラヒック量増大に伴い,ルータやスイッチ等,ネットワーク機器による電力消費量が増加している.特に,多数のネットワーク機器を含むISPのネットワークに注目した場合,ルータによる電力消費量が大きく,その削減は重要な課題となる.この課題を解決するため,著者らは既に,ネットワークを流れるトラヒック量の変化に応じてレイヤ3トポロジを動的に変更し,トポロジ変更によりトラヒック転送に不要となった …

    IEICE technical report. Information networks 111(9), 29-34, 2011-04-14

    CiNii Fulltext PDF - Subscription  References (17)

  • 14

    Science of Quantum Phase Transitions and Quantum Criticalities  [in Japanese]

    Imada Masatoshi

    熱ゆらぎによって生じるお馴染みの相転移と対照的に,量子ゆらぎが生む量子相転移には特有の機構があり,臨界現象に反映する.量子相転移には熱ゆらぎによる相転移と共通な機構-自発的な対称性の破れ-に起因するものもあるが,その場合でも量子力学固有のゆらぎを伴い新たな様相も生じる.一方,量子相転移にはそれだけでなく,トポロジーの変化に起因するものがあり,固有な性格を持つ.さらにこの両者が結びつく機構が最近見出 …

    Butsuri 66(2), 88-96, 2011-02-05

    CiNii Fulltext PDF - Open Access  References (57)

  • 15

    A Low-Noise and Highly-Linear Transmitter with Envelope Injection Pre-Power Amplifier for Multi-Mode Radio

    KOUSAI Shouhei , MIYASHITA Daisuke , WADATSUMI Junji , ITO Rui , SEKIGUCHI Takahiro , HAMADA Mototsugu , OKADA Kenichi

    … Active matching technique with doubly terminated LPF topology is also presented to realize wide bandwidth, low power consumption, and to eliminate off-chip components without increasing die area. … A multi-mode transmitter is implemented in a 0.13µm CMOS technology with an active area of 1.13mm2. …

    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences 94(2), 592-602, 2011-02-01

    J-STAGE CrossRef References (24)

  • 16

    Routing-based Channel Assignment in Cognitive Radio Networks  [in Japanese]

    FUJITA Norihito , UEDA Hirofumi , YAGYU Tomohiko

    コグニティブ無線ネットワークは、各ノードに割り当てる通信周波数(チャネル)を自由に変えられることが特徴であり、各ノードに割り当てたチャネルに応じて異なるトポロジが構成される。従来、ルーティングはチャネル割り当てによるトポロジ決定後に行われていたため、ルーティングの結果、アクティブなリンクを作るためには使用されないチャネルが発生し、アクティブなリンクのキャパシティが小さくなるという問題があった。筆者 …

    IEICE technical report 110(372), 19-24, 2011-01-13

    CiNii Fulltext PDF - Subscription  References (8)

  • 17

    Design of Small Area Active-Feedback Low-Noise Amplifier  [in Japanese]

    KANEMARU Masaki , SAITO Noriaki

    近年の無線端末の多機能化や利用周波数帯の増加に伴い、無線ブロックの小型化が強く望まれている。これに対する動きとして、複数の周波数帯を共通の回路で実現するリコンフィギュアラブル化が進んでいる。一方で無線受信回路の初段に置かれる低雑音増幅器(Low Noise Amplifier, LNA)は、要求される性能からリコンフィギュアラブル化が難しく、またチップ面積が大きいという課題も抱えている。本稿では、 …

    IEICE technical report. Microwaves 110(343), 41-46, 2010-12-09

    CiNii Fulltext PDF - Subscription  References (8)

  • 18

    ESMO : An Energy-Efficient Mobile Node Scheduling Scheme for Sound Sensing

    HAO Tian , IWAI Masayuki , TOBE Yoshito , SEZAKI Kaoru

    … By applying this scheme, optimized sensing schedules (ACTIVE/SLEEP duty cycles) will be periodically generated at each node. … Furthermore, this is the first scheme that is adaptable to large-scale mobile sensor networks where topology dynamically changes. …

    IEICE Transactions on Communications 93(11), 2912-2924, 2010-11-01

    J-STAGE CrossRef References (26)

  • 19

    EE2010-14 Investigations on Output/Input Voltage Gain of Soft Switching PWM Boost DC-DC Converter with Switched Capatitor Snubber  [in Japanese]

    TAKEUCHI Yujiro , MISHIMA Tomokazu , NAKAOKA Mutsuo

    新エネルギー発電や自動車電源を中心にニーズが高まる昇圧形DC-DCコンバータの高性能化として,損失や電磁ノイズの低減化とともに,昇圧率(入出力電圧ゲイン)の向上が要求されている.ソフトスイッチング動作とともに高い入出力電圧ゲインが得られる回路方式として,筆者らはスイッチトキャパシタスナバをもつ不連続モードソフトスイッチング昇圧形DC-DCコンバータを提案している.本稿では,この提案回路のもつ電圧ゲ …

    Technical report of IEICE. Energy engineering in electronics and communications 110(151), 111-115, 2010-07-22

    CiNii Fulltext PDF - Subscription  References (7) Cited by (1)

  • 20

    Practical Evaluations of a Novel Asymmetrical ZCS-PWM DC-DC Converter with High-Frequency Transformer-Link  [in Japanese]

    MISHIMA Tomokazu , HIRAKI Eiji , NAKAOKA Mutsuo

    … In order to attain the wide range of soft-commutation under the condition of constant switching frequency, the single Active Edge-Resonant Cell (AERC) that is composed of a lossless inductor and a switched resonant capacitor is originally employed for the half-bridge inverter arm, providing and assisting ZCS operations in the switching power devices. … Finally, the feasibility of the DC-DC converter topology is discussed from the view points of the high efficiency and high power density. …

    IEEJ Transactions on Industry Applications 130(5), 605-613, 2010-05-01

    J-STAGE CrossRef References (14)