• Title/Summary/Keyword: multi-device

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Hybrid Offloading Technique Based on Auction Theory and Reinforcement Learning in MEC Industrial IoT Environment (MEC 산업용 IoT 환경에서 경매 이론과 강화 학습 기반의 하이브리드 오프로딩 기법)

  • Bae Hyeon Ji;Kim Sung Wook
    • KIPS Transactions on Computer and Communication Systems
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    • v.12 no.9
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    • pp.263-272
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    • 2023
  • Industrial Internet of Things (IIoT) is an important factor in increasing production efficiency in industrial sectors, along with data collection, exchange and analysis through large-scale connectivity. However, as traffic increases explosively due to the recent spread of IIoT, an allocation method that can efficiently process traffic is required. In this thesis, I propose a two-stage task offloading decision method to increase successful task throughput in an IIoT environment. In addition, I consider a hybrid offloading system that can offload compute-intensive tasks to a mobile edge computing server via a cellular link or to a nearby IIoT device via a Device to Device (D2D) link. The first stage is to design an incentive mechanism to prevent devices participating in task offloading from acting selfishly and giving difficulties in improving task throughput. Among the mechanism design, McAfee's mechanism is used to control the selfish behavior of the devices that process the task and to increase the overall system throughput. After that, in stage 2, I propose a multi-armed bandit (MAB)-based task offloading decision method in a non-stationary environment by considering the irregular movement of the IIoT device. Experimental results show that the proposed method can obtain better performance in terms of overall system throughput, communication failure rate and regret compared to other existing methods.

The Effect of Online Multiple Channel Marketing by Device Type (디바이스 유형을 고려한 온라인 멀티 채널 마케팅 효과)

  • Hajung Shin;Kihwan Nam
    • Information Systems Review
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    • v.20 no.4
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    • pp.59-78
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    • 2018
  • With the advent of the various device types and marketing communication, customer's search and purchase behavior have become more complex and segmented. However, extant research on multichannel marketing effects of the purchase funnel has not reflected the specific features of device User Interface (UI) and User Experience (UX). In this study, we analyzed the marketing channel effects of multi-device shoppers using a unique click stream dataset from global online retailers. We examined device types that activate online shopping and compared the differences between marketing channels that promote visits. In addition, we estimated the direct and indirect effects on visits and purchase revenue through customer's accumulated experience and channel conversions. The findings indicate that the same customer selects a different marketing channel according to the device selection. These results can help retailers gain a better understanding of customers' decision-making process in multi-marketing channel environment and devise the optimal strategy taking into account various device types. Our empirical analyses yield business implications based on the significant results from global big data analytics and contribute academically meaningful theoretical framework using an economic model. We also provide strategic insights attributed to the practical value of an online marketing manager.

Implementation of a Multi-Protocol Baseband Modem for RFID Reader (RFID Reader용 멀티 프로토콜 모뎀 설계)

  • Moon, Jeon-Il;Ki, Tae-Hun;Bae, Gyu-Sung;Kim, Jong-Bae
    • The Journal of Korea Robotics Society
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    • v.4 no.1
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    • pp.1-9
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    • 2009
  • Radio Frequency Identification (RFID) is an automatic identification method. Information such as identification, logistics history, and specification of products are written and stored into the memory of RFID tags (that is, transponders), and retrieved through RF communication between RFID reader device and RFID tags. RFID systems have been applied to many fields of transportation, industry, logistics, environment, etc in order to improve business efficiency and reduce maintenance cost as well. Recently, some research results are announced in which RFID devices are combined with other sensors for mobile robot localization. In this paper, design of multi-protocol baseband for RFID reader device is proposed, and the baseband modem is implemented into SoC (System On a Chip). The baseband modem SoC for multi-protocol RFID reader is composed of several IP (Intellectual Property) blocks such as multi-protocol blocks, CPU, UART(Universal Asynchronous Receiver and Transmitter), memory, etc. As a result, the SoC implemented with FPGA(Field Programmable Gate Array) is applied to real product. It is shown that the size of RFID Reader module designed with the FPGA becomes smaller, and the SoC chip price for the same function becomes cheap. In addition, operation performance could be the same or better than that of the product with no SoC applied.

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A 13.56 MHz CMOS Multi-Stage Rectifier for Wireless Power Transfer in Biomedical Applications (바이오응용 무선전력전달을 위한 13.56 MHz CMOS 다단 정류기)

  • Cha, Hyouk-Kyu
    • Journal of the Institute of Electronics and Information Engineers
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    • v.50 no.3
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    • pp.35-41
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    • 2013
  • An efficient multi-stage rectifier for wireless power transfer in deep implant medical devices is implemented using $0.18-{\mu}m$ CMOS technology. The presented three-stage rectifier employs a cross-coupled topology to boost a small input AC signal from the external device to produce a 1.2-1.5 V output DC signal for the implant device. The designed rectifier achieves a maximum measured power conversion efficiency of 70% at 13.56 MHz under the conditions of a low 0.6-Vpp RF input signal with a $10-k{\Omega}$ output load resistance.

Study on the Electrical Characteristics of the Multi-RESURF SOI LDMOSFET as a Function of Epi-layer Concentration (에피층 농도 변화에 따른 Multi-RESURF SOI LDMOSFET의 전기적 특성 분석)

  • Kim, Hyoung-Woo;Seo, Kil-Soo;Bahng, Wook;Kim, Ki-Hyun;Kim, Nam-Kyun
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.9
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    • pp.813-817
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    • 2006
  • In this paper, we analyzed the breakdown voltage and on-resistance of the multi-RESURF SOI LDMOSFET as a function of epi-layer concentration. P-/n-epi layer thickness and doping concentration of the proposed structure are varied from $2{\sim}5{\mu}m\;and\;1\{times}10^{15}/cm^{3}^{\sim}9\{times}10^{15}/cm^{3}$ to find optimum breakdown voltage and on-resistance of the proposed structure. The maximum breakdown voltage of the proposed structure is $224\;V\;at\;R_{on}=0.2{\Omega}-mon^{2}\;with\;P_{epi}=3\{times}10^{15}/cm^{3},\;N_{epi}=7\{times}10^{15}/cm^{3}\;and\;L_{epi}=10{\mu}m$. Characteristics of the device are verified by two-dimensional process simulator ATHENA and device simulator ATLAS.

Stack-Structured Phase Change Memory Cell for Multi-State Storage (멀티비트 정보저장을 위한 적층 구조 상변화 메모리에 대한 연구)

  • Lee, Dong-Keun;Kim, Seung-Ju;Ryu, Sang-Ouk
    • Journal of the Semiconductor & Display Technology
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    • v.8 no.1
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    • pp.13-17
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    • 2009
  • In PRAM applications, the devices can be made for both binary and multi-state storage. The ability to attain intermediate stages comes either from the fact that some chalcogenide materials can exist in configurations that range from completely amorphous to completely crystalline or from designing device structure such a way that mimics multiple phase chase phenomena in single cell. We have designed stack-structured phase change memory cell which operates as multi-state storage. Amorphous $Ge_xTe_{100-x}$ chalcogenide materials were stacked and a diffusion barrier was chosen for each stack layers. The device is operated by crystallizing each chalcogenide material as sequential manner from the bottom layer to the top layer. The amplitude of current pulse and the duration of pulse width was fixed and number of pulses were controlled to change overall resistance of the phase change memory cell. To optimize operational performance the thickness of each chalcogenide was controlled based on simulation results.

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Human Activity Recognition using an Image Sensor and a 3-axis Accelerometer Sensor (이미지 센서와 3축 가속도 센서를 이용한 인간 행동 인식)

  • Nam, Yun-Young;Choi, Yoo-Joo;Cho, We-Duke
    • Journal of Internet Computing and Services
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    • v.11 no.1
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    • pp.129-141
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    • 2010
  • In this paper, we present a wearable intelligent device based on multi-sensor for monitoring human activity. In order to recognize multiple activities, we developed activity recognition algorithms utilizing an image sensor and a 3-axis accelerometer sensor. We proposed a grid?based optical flow method and used a SVM classifier to analyze data acquired from multi-sensor. We used the direction and the magnitude of motion vectors extracted from the image sensor. We computed the correlation between axes and the magnitude of the FFT with data extracted from the 3-axis accelerometer sensor. In the experimental results, we showed that the accuracy of activity recognition based on the only image sensor, the only 3-axis accelerometer sensor, and the proposed multi-sensor method was 55.57%, 89.97%, and 89.97% respectively.

Rotational Drive-Versus-Quality and Video Compression-Versus-Delay Analysis for Multi-Channel Video Streaming System on Ground Combat Vehicles (지상 전투 차량을 위한 다채널 영상 스트리밍 시스템의 회전 구동 대비 품질과 압축 대비 지연 분석)

  • Yun, Jihyeok;Cho, Younggeol;Chang, HyeMin
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.1
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    • pp.31-40
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    • 2021
  • The multi-channel video streaming system is an essential device for future ground combat vehicles. For the system, the application of digital interfaces is required instead of the direct analog method to support selectable multiple channels. However, due to the characteristics of the digital interfaces that require en/decoding and signal conversion, the system should support the ability to adapt to quality and delay requirements depending on how video data is utilized. To support addressed issue, this study designs and emulates the multi-channel compressed-video streaming system of ground combat vehicle's fire control system based on commercial standards. Using the system, this study analyzes the quality of video according to the rotational speed of the acquisition device and Glass-to-Glass (G2G) delay between video acquisition and display devices according to video compression rates. Through these experiments and analysis, this paper presents the design direction of the system having scalability on the latest technology while providing high-quality video data streaming flexibly.

Nanoscale Fabrication of Biomolecular Layer and Its Application to Biodevices

  • Park, Jeong-Woo;Nam, Yun-Suk;Masamichi Fujihira
    • Biotechnology and Bioprocess Engineering:BBE
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    • v.9 no.2
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    • pp.76-85
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    • 2004
  • Biodevices composed of biomolecular layer have been developed in various fields such as medical diagnosis, pharmaceutical screening, electronic device, photonic device, environmental pollution detection device, and etc. The biomolecules such as protein, DNA and pigment, and cells have been used to construct the biodevices such as biomolecular diode, biostorage device, bioelectroluminescence device, protein chip, DNA chip, and cell chip. Substantial interest has focused upon thin film fabrication or the formation of biomaterials mono- or multi-layers on the solid surfaces to construct the biodevices. Based on the development of nanotechnology, nanoscale fabrication technology for biofilm has been emerged and applied to biodevices due to the various advantages such as high density immobilization and orientation control of immoblized biomolecules. This review described the nanoscale fabrication of biomolecular film and its application to bioelectronic devices and biochips.

Implementation of Multi-motors driving system using DeviceNet (DeviceNet을 이용한 복수전동기 구동시스템 구현)

  • Choi Woong;Lee Hong-Hee;Jung Eui-Heon
    • Proceedings of the KIPE Conference
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    • 2006.06a
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    • pp.308-310
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    • 2006
  • DeviceNet은 Rockwell/Allen-Bradley에서 개발된 응용계층으로 CAN(controller area network)을 기반으로 한 저가의 통신 링크이며 단순한 산업용 디바이스(sensors, actuators)와 상위 디바이스(controller)를 연결하는 하위 레벨의 네트워크이다. 본 논문에서는 2대의 전동기를 마스터, 슬레이브 형식으로 실시간 동특성을 만족할 수 있는 동기제어 알고리즘을 개발하고 이를 DeviceNet을 이용하여 실시간으로 제어할수 있는 복수 전동기 구동시스템을 구현하고자 한다. DeviceNet 마스터는 Hilscher사(社)의 DeviceNet Card(CIF50-DNM)를 PC에 장착되어 구현하고 슬레이브는 Atmel사(社)의 AVR칩(AT90CAN128)을 이용하여 설계하였다.

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