• Title, Summary, Keyword: Multiple Connectivity Function

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Implementation of Multiple Connectivity using CANopen in IEEE 1451.0-based Smart Sensor (IEEE 1451.0 기반 스마트 센서에서 CANopen을 이용한 다중 접속 기능의 구현)

  • Park, Jee-Hun;Lee, Suk;Song, Young-Hun;Lee, Kyung-Chang
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.4
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    • pp.436-445
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    • 2011
  • As automation systems become intelligent and autonomous for productibility, industrial networks (fieldbuses) and network-based devices are essential components of intelligent manufacturing systems. However, there are obstacles for the wide acceptance of the network-based devices such as smart sensor and network-based actuator. First, there exist numerous fieldbus protocols that a network-based device should be able to support. Second, the whole network-based device has to be replaced when only the sensor of the module fails. In order to overcome these obstacles, a smart sensor/actuator is implemented as two units; one responsible for network communication and the other for sensor/actuator operations using IEEE 1451.0 standard. This paper presents a structure of the 1451.0-based smart sensor with multiple connectivity function designed by CANopen.

Graph-Based framework for Global Registration (그래프에 기반한 전역적 정합 방법)

  • 김현우;홍기상
    • Proceedings of the IEEK Conference
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    • pp.671-674
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    • 2000
  • In this paper, we present a robust global registration algorithm for multi-frame image mosaics. When we perform a pair-wise registration recovering a projective transformation between two consecutive frames, severe mis-registration among multiple frames, which are not consecutive, can be detected. It is because the concatenation of those pair-wise transformations leads to global alignment errors. To overcome those mis-registrations, we propose a new algorithm using multiple frames for constructing image mosaics. We use a graph to represent the temporal and spatial connectivity and show that global registration can be obtained through the search for an optimal path in the constructed graph. The definition of an adequate objective function characterizing the global registration provides a direct manipulation of the graph. In the presence of moving objects, especially large ones compared with low texture backgrounds, by using the likelihood ratio as the objective function, we can deal with some of the most challenging videos like basketball or soccer Moreover, the algorithm can be parallelized so it can be more efficiently implemented. Finally, we give some experimental results from real videos.

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Corridor and Network Analyses of Forest Bird Habitats in a Metropolitan Area of South Korea (수도권 지역 산림성 조류 서식지의 통로와 연결망 분석)

  • Kang, Wanmo;Park, Chan-Ryul
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.17 no.3
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    • pp.191-201
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    • 2015
  • Measuring and mapping connectivity among habitats is a key component of sustainable urban planning and design process. In this study, we examined how functional corridors connect forest bird habitats in a metropolitan area of Korea using graph theory-based techniques. High-quality forest habitat was defined as a function of forest cover, presence of residential areas, and road networks. We then constructed a network of high-quality forest habitats using the FunConn (functional connectivity) tools, and computed metrics ($T_i$) of patch importance based on the minimum ($Q_1$) and the 25th percentile ($Q_{25}$) rank least-cost distance values. We investigated the relative influence of two values of patch importance on forest bird species richness. As a result, the patch importance index based on the $Q_{25}$ effective distance threshold was most positively correlated with species richness (P < 0.001) after controlling for the area effect. Thus, using the $Q_{25}$ effective distance threshold, we mapped not only the locations of important habitat patches and functional corridors, but also the network backbone of forest bird habitats. The network developed in this study can help guide urban planning for biodiversity conservation.

Smartphone-based O2 Deficiency Monitoring Device (스마트폰 기반 산소 결핍 모니터링 장치)

  • Loh, Byoung Gook
    • Journal of the Korean Society of Safety
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    • v.30 no.6
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    • pp.117-121
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    • 2015
  • $O_2$-deficiency related accidents occur every year and the most effective way to prevent them is to measure $O_2$ concentration in air with a properly-calibrated $O_2$ monitoring device before entering low-$O_2$ areas. An electro-chemical sensor, Texas Instrument gas platform, and iPhone are used to construct a smartphone-based $O_2$ monitoring device. The smartphone based $O_2$ measuring approach offers advantages of small size, accessibility, internet-connectivity, and programmability in comparison to conventional $O_2$ measuring devices. Multiple gas sensors can be conveniently interfaced to single smartphone, allowing for creating a network of gas sensors distributed across workplaces and remote monitoring via existing mobile communication network. To check proper function of the $O_2$ monitoring device the sensor was exposed to shallow and deep human breaths. The readings decreased immediately after being exposed to exhalation and recovered during inhalation to a calibrated level of 20.9%. When readings decreased below a preset warning value of 19.5%, a low $O_2$ warning was successfully activated on the smartphone.

Implementation of Multi-encoder Management System based on CANopen Protocol (CANopen 표준 기반 멀티 엔코더 관리 시스템의 구현)

  • Ahn, Hyosung;Kim, Taehyoun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.6
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    • pp.533-541
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    • 2017
  • Recently, with the adoption of modern computing and communication technologies, manufacturing systems have become more autonomous and intelligent. Thus, as the number of field devices with smart sensors also increase, the need for an integrated management of such devices becomes essential. This paper proposes a smart encoder architecture that integrates the position sensing function with CANopen connectivity. In addition, an integrated system is proposed to simultaneously control and monitor multiple encoders over the Controller Area Network (CAN) fieldbus network. We evaluated the performance and functionalities of the proposed system by comparative experiments with commercial CANopen smart encoders using a CANopen conformance test.

PLC and Arduino Interaction Based on Modbus Protocol

  • Jeong, Yunju;Ansari, Md Israfil;Shin, WooHyeon;Kang, Bonggu;Lim, JinSeop;Moon, HyeonSik;Shim, Jaechang
    • Journal of Korea Multimedia Society
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    • v.20 no.3
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    • pp.511-519
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    • 2017
  • This Paper introduces the design and communication method between PLC (Programmable Logic Controller) and Arduino based on MODBUS Protocol. MODBUS connection can be established in a new or existing system very easily, therefore we used this protocol in our proposed system. In the field of automatic devices, multi-function serial port such as RS232, RS422, RS485, and so on creates a great convenience to the developer. This proposed system used RS485 as a key mediator for data exchanging on a connected network. We also believe that it will reduce the development cost in various automated industry because this system can be reused or can be implemented any such PLC installed machines. RS485 is used as a communication interface between PLC (as a slave) and Arduino (as a master), through which a reliable network is created for safe and fast communication. Furthermore, RS485 allows multiple devices(up to 32) to communicate at half duplex on a single pair of wires and provides a long connectivity area (up to 1200 meters) as compare to other device, which makes it a user-friendly for various devices in the automated industry. Moreover, Arduino can play as a mediator by connecting third party device and setup a communication network with PLC.

Distributed Construction of the Multiple-Ring Topology of the Connected Dominating Set for the Mobile Ad Hoc Networks: Boltzmann Machine Approach (무선 애드혹 망을 위한 연결 지배 집합 다중-링 위상의 분산적 구성-볼츠만 기계적 접근)

  • Park, Jae-Hyun
    • Journal of KIISE:Information Networking
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    • v.34 no.3
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    • pp.226-238
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    • 2007
  • In this paper, we present a novel fully distributed topology control protocol that can construct the multiple-ring topology of Minimal Connected Dominating Set (MCDS) as the transport backbone for mobile ad hoc networks. It makes a topology from the minimal nodes that are chosen from all the nodes, and the constructed topology is comprised of the minimal physical links while preserving connectivity. This topology reduces the interference. The all nodes work as the nodes of the distributed parallel Boltzmann machine, of which the objective function is consisted of two Boltzmann factors: the link degree and the connection domination degree. To define these Boltzmann factors, we extend the Connected Dominating Set into a fuzzy set, and also define the fuzzy set of nodes by which the multiple-ring topology can be constructed. To construct the transport backbone of the mobile ad hoc network, the proposed protocol chooses the nodes that are the strong members of these two fuzzy sets as the clusterheads. We also ran simulations to provide the quantitative comparison against the related works in terms of the packet loss rate and the energy consumption rate. As a result, we show that the network that is constructed by the proposed protocol has far better than the other ones with respect to the packet loss rate and the energy consumption rate.

Neuropeptide Regulation of Signaling and Behavior in the BNST

  • Kash, Thomas L.;Pleil, Kristen E.;Marcinkiewcz, Catherine A.;Lowery-Gionta, Emily G.;Crowley, Nicole;Mazzone, Christopher;Sugam, Jonathan;Hardaway, J. Andrew;McElligott, Zoe A.
    • Molecules and Cells
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    • v.38 no.1
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    • pp.1-13
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    • 2015
  • Recent technical developments have transformed how neuroscientists can probe brain function. What was once thought to be difficult and perhaps impossible, stimulating a single set of long range inputs among many, is now relatively straight-forward using optogenetic approaches. This has provided an avalanche of data demonstrating causal roles for circuits in a variety of behaviors. However, despite the critical role that neuropeptide signaling plays in the regulation of behavior and physiology of the brain, there have been remarkably few studies demonstrating how peptide release is causally linked to behaviors. This is likely due to both the different time scale by which peptides act on and the modulatory nature of their actions. For example, while glutamate release can effectively transmit information between synapses in milliseconds, peptide release is potentially slower [See the excellent review by Van Den Pol on the time scales and mechanisms of release (van den Pol, 2012)] and it can only tune the existing signals via modulation. And while there have been some studies exploring mechanisms of release, it is still not as clearly known what is required for efficient peptide release. Furthermore, this analysis could be complicated by the fact that there are multiple peptides released, some of which may act in contrast. Despite these limitations, there are a number of groups making progress in this area. The goal of this review is to explore the role of peptide signaling in one specific structure, the bed nucleus of the stria terminalis, that has proven to be a fertile ground for peptide action.