• Title/Summary/Keyword: 다중계층

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Distributed data deduplication technique using similarity based clustering and multi-layer bloom filter (SDS 환경의 유사도 기반 클러스터링 및 다중 계층 블룸필터를 활용한 분산 중복제거 기법)

  • Yoon, Dabin;Kim, Deok-Hwan
    • The Journal of Korean Institute of Next Generation Computing
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    • v.14 no.5
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    • pp.60-70
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    • 2018
  • A software defined storage (SDS) is being deployed in cloud environment to allow multiple users to virtualize physical servers, but a solution for optimizing space efficiency with limited physical resources is needed. In the conventional data deduplication system, it is difficult to deduplicate redundant data uploaded to distributed storages. In this paper, we propose a distributed deduplication method using similarity-based clustering and multi-layer bloom filter. Rabin hash is applied to determine the degree of similarity between virtual machine servers and cluster similar virtual machines. Therefore, it improves the performance compared to deduplication efficiency for individual storage nodes. In addition, a multi-layer bloom filter incorporated into the deduplication process to shorten processing time by reducing the number of the false positives. Experimental results show that the proposed method improves the deduplication ratio by 9% compared to deduplication method using IP address based clusters without any difference in processing time.

Partial Offloading System of Multi-branch Structures in Fog/Edge Computing Environment (FEC 환경에서 다중 분기구조의 부분 오프로딩 시스템)

  • Lee, YonSik;Ding, Wei;Nam, KwangWoo;Jang, MinSeok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.26 no.10
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    • pp.1551-1558
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    • 2022
  • We propose a two-tier cooperative computing system comprised of a mobile device and an edge server for partial offloading of multi-branch structures in Fog/Edge Computing environments in this paper. The proposed system includes an algorithm for splitting up application service processing by using reconstructive linearization techniques for multi-branch structures, as well as an optimal collaboration algorithm based on partial offloading between mobile device and edge server. Furthermore, we formulate computation offloading and CNN layer scheduling as latency minimization problems and simulate the effectiveness of the proposed system. As a result of the experiment, the proposed algorithm is suitable for both DAG and chain topology, adapts well to different network conditions, and provides efficient task processing strategies and processing time when compared to local or edge-only executions. Furthermore, the proposed system can be used to conduct research on the optimization of the model for the optimal execution of application services on mobile devices and the efficient distribution of edge resource workloads.

Stability Analysis of Multi-motor Controller based on Hierarchical Network (계층적 네트워크 기반 다중 모터 제어기의 안정도 분석)

  • Chanwoo Moon
    • The Journal of the Convergence on Culture Technology
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    • v.9 no.3
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    • pp.677-682
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    • 2023
  • A large number of motors and sensors are used to drive a humanoid robot. In order to solve the wiring problem that occurs when connecting multiple actuators, a controller based on a communication network has been used, and CAN, which is advantageous in terms of cost and a highly reliable communication protocol, was mainly used. In terms of the structure of the controller, a torque control type structure that is easy to implement an advanced algorithm into the upper controller is preferred. In this case, the low communication bandwidth of CAN becomes a problem, and in order to obtain sufficient communication bandwidth, a communication network is configured by separating into a plurality of CAN networks. In this study, a stability analysis on transmission time delay is performed for a multi-motor control system in which high-speed FlexRay and low-speed CAN communication networks are hierarchically connected in order to obtain a high communication bandwidth, and sensor information and driving signals are delivered within the allowed transmission time. The proposed hierarchical network-based control system is expected to improve control performance because it can implement multiple motor control systems with a single network.

Performance Analysis of Optical CDMA System with Cross-Layer Concept (계층간 교차 개념을 적용한 광 부호분할 다중접속 시스템의 성능 분석)

  • Kim, Jin-Young;Kim, Eun-Cheol
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.46 no.7
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    • pp.13-23
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    • 2009
  • In this paper, the network performance of a turbo coded optical code division multiple access (CDMA) system with cross-layer, which is between physical and network layers, concept is analyzed and simulated. We consider physical and MAC layers in a cross-layer concept. An intensity-modulated/direct-detection (IM/DD) optical system employing pulse position modulation (PPM) is considered. In order to increase the system performance, turbo codes composed of parallel concatenated convolutional codes (PCCCs) is utilized. The network performance is evaluated in terms of bit error probability (BEP). From the simulation results, it is demonstrated that turbo coding offers considerable coding gain with reasonable encoding and decoding complexity. Also, it is confirmed that the performance of such an optical CDMA network can be substantially improved by increasing e interleaver length and e number of iterations in e decoding process. The results of this paper can be applied to implement the indoor optical wireless LANs.

The Layered Receiver Employing Whitening Process for Multiple Space-Time Codes (다중 시공간 부호를 위한 백색화 과정을 이용한 계층화 수신기)

  • Yim Eun Jeong;Kim Dong Ku
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.42 no.3 s.333
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    • pp.15-18
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    • 2005
  • Multiple space-time codes (M-STTC) is composed of several space-time codes. That provides high transmission rate as well as diversity and coding gain without bandwidth expansion. In this paper, the layered receiver structures employing whitening process for M-STTC is proposed. The proposed receiver is composed of the decoding order decision block and the layered detection block. The whitening process in the latter is utilized to maximize the receive diversity gain in the layered detection. The layered receiver employing whitening process has more diversity gain and advantage of the required number of receive antenna over the layered detection with MMSE nulling. The proposed scheme achieves a 5dB gain compared to the coded layered space-time processing at the FER of $10^{-2}$.

Throughput enhancement for large file delivery using overlay multicast with multiple virtual sources (대용량 파일 전송의 성능 향상을 위한 다중 가상 소스 응용계층 멀티캐스트)

  • 이수전;강경란;이동만
    • Proceedings of the Korean Information Science Society Conference
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    • 2004.10c
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    • pp.598-600
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    • 2004
  • 다자간 데이터 송수신을 필요로 하는 다자간 화상 회의, 일대다 스트리밍, 일대다 파일 전송 등의 응용에서는 멀티캐스트를 사용하여 데이터 전송 부담을 줄일 수 있다. 그러나 IP 멀티캐스트가 인터넷 상에서 널리 지원되지 않고 있기 때문에, 멀티캐스트를 응용 계층에 구현하려는 연구가 활발히 진행되고 있다. 본 논문에서는 일대다 대용량 파일 전송에서 효과적으로 전송시간을 단축할 수 있는 응용계층 멀티캐스트 기법을 제시한다. 신뢰적 전송을 위하여 Forward Error Correction (FEC)를 사용하여, 전송시간 단축을 위해 데이터 소스 외에 수신자들이 가상적으로 소스의 역할을 수행하도록 한다. 즉, 임의의 수신자는 데이터 소스뿐만 아니라, 다중 가상 소스로부터도 데이터를 수신할 수 있으므로 파일 수신 시간을 단축시킬 수 있다.

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A Study on Group-Role Based Access Control System for the Integrated Access Control in Muti-Applicational Computing Environment (다중 응용 환경에서 통합 접근통제가 가능한 그룹-역할기반 접근통제 시스템에 관한 연구)

  • 권태형;남길현
    • Proceedings of the Korean Information Science Society Conference
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    • 2001.10a
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    • pp.622-624
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    • 2001
  • 역할기반 접근통제(RBAC)는 사용자의 역할에 기반을 둔 접근통제 방법으로 Ravi S. Sandhu가 제안한 기본 모델 이후로 다양한 모델들이 제안되어졌다. 하지만, 이 모델들은 다중 응용 환경에 적합한 통합접근통제 시스템 설계에 실제 적용하기 위해서는 보완되어야 할점이 많다. 본 논문에서는 이 모델들의 주요 구성요소를 근간으로 하여 그룹-역할기반접근통제 시스템을 제안하고자 한다. 제안된 시스템은 사용자와 역할지정에 그룹 계층을 사용하고, 조직내의 직위와 직능을 바탕으로 역할 계층을 만들며, 만들어진 역할 계층을 통한 허가의 상속을 허용한다. 또한, 시스템이 가진 접근통제 데이터베이스를 세가지 부분으로 나누어 관리하게 함으로써, 조직의 접근통제 정책의 투명성을 보장한다.

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Intra Prediction Using Multiple Models Based on Fully Connected Layer (완전연결계층 기반의 다중 모델을 이용한 화면내 예측)

  • Kim, Minjae;Moon, Gihwa;Park, Dohyeon;Kwon, Hyoungjin;Kim, Jae-Gon
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2021.06a
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    • pp.355-356
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    • 2021
  • 딥러닝 기술과 하드웨어의 발전으로 다양한 분야에서 인공신경망과 관련한 연구가 활발히 진행되고 있다. 비디오 코덱 부분에서도 딥러닝 기술을 적용하는 부호화 기술이 많이 연구되고 있다. 본 논문은 최근 완료된 VVC 에 채택된 신경망 기반의 기술인 MIP(Matrix Weighted Intra Prediction)를 확장하여 보다 깊은 계층의 모델로 학습된 새로운 화면내 예측 모델을 제안한다. 기존 VVC 의 MIP 의 성능과 비교하기 위하여 기존 MIP 모델과 제안하는 다중완전연결계층(Fully Connected Layer) 화면내 예측 모델을 HEVC(High Efficiency Video Coding)에 적용하여 그 성능을 비교하였다. 실험결과 제안기법은 VVC MIP 대비 0.08 BD-rate 성능 향상을 보였다.

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Performance Analysis of IEEE 802.11n System adapting Frame Aggregation Methods (Frame Aggregation 기법을 적용한 IEEE 802.11n 시스템 성능 분석)

  • Lee, Yun-Ho;Kim, Joo-Seok;Kim, Kyung-Seok
    • The Journal of the Korea Contents Association
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    • v.9 no.12
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    • pp.515-527
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    • 2009
  • IEEE 802.11n is an ongoing next-generation WLAN(Wireless Local Area Network) standard that supports a very high-speed connection with more than 100Mb/s data throughput measured at the MAC(Medium Access Control) layer. Study trends of IEEE 802.11n show two aspects, enhanced data throughput using aggregation among packets in MAC layer, and better data rates adapting MIMO(Multiple-Input Multiple-Output) in PHY(Physical) layer. But, the former doesn't consider wireless channel and the latter doesn't consider aggregation among packets for reality. Therefore, this paper analyzes data throughput for IEEE 802.11n considering MAC and PHY connection. A-MPDU(Aggregation-MAC Protocol Data Unit) and A-MSDU(Aggregation-MAC Service Unit) is adapted considering multi-service in MAC layer, WLAN MIMO TGn channel using SVD(Singular Value Decomposition) is adapted considering MIMO and wireless channel in PHY layer. Consequently, Simulation results shows throughput between A-MPDU and A-MSDU. Also, We use Ns-2(Network simulator-2) for reality.

A Converged Study on the Influence of Subjective Social Class on Suicide Ideation of Middle Aged Adults: Double Mediating Effect of Social Support and Self-esteem (중년성인의 주관적 사회계층과 자살생각에 대한 융합연구: 사회적 지지와 자아존중감의 다중매개 효과)

  • Ko, Young;Kim, Ji-Youn
    • Journal of Convergence for Information Technology
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    • v.10 no.7
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    • pp.108-115
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    • 2020
  • The purpose of this study is to identify the double mediating the effects of social support and self-esteem in the relationship between the subjective social class and the suicide thoughts of middle aged men and women. The subjective social class was analyzed in a parallel double-mediated model to check the mediating effect of self-esteem and social support on the idea of suicide. Social support and self-respect, which are mediating variables of subjective social class on suicide idea, both were a statistically significant. Putting the results of this study together, it is essential to establish a living-based social support system for middle-aged adults. This will contribute to improving self-esteem among middle-aged adults.