• 제목/요약/키워드: Device Twin

검색결과 55건 처리시간 0.024초

쌍둥이 인접구조물의 진동 제어를 위한 비대칭 지진격리 연결 제어시스템의 매개변수연구 (Parametric Study of Asymmetric Base-Isolation Coupling Control System for Vibration Control of Adjacent Twin Buildings)

  • 김다위;박원석;옥승용
    • 한국안전학회지
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    • 제37권3호
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    • pp.45-51
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    • 2022
  • This paper focuses on a recently proposed asymmetric base-isolation coupling control system (ABiCS) for the vibration control of adjacent twin buildings. The ABiCS consists of inter-story diagonal dampers, a connecting damper between the two buildings, and a seismic isolation device at the base floor of one building. To investigate the control characteristics of ABiCS, a parametric study was performed by numerically simulating the 20-story twin buildings. In the parametric study, the control capacities of the inter-story diagonal dampers, connecting damper, and seismic isolation device were considered as varying parameters. The parametric study results indicate that the connecting damper between the two buildings reduces the responses of both buildings only at optimal or near-optimal capacity. In addition, adjusting the stiffness of the base isolation is found to be the most effective method for improving seismic performance and achieving cost-effectiveness. Accordingly, we presented a scenario-based performance improvement approach in which reducing the stiffness of the base isolation device could be an effective technique to improve the seismic performance of both buildings. However, note that checking the maximum allowable displacement of the base isolation device is essential.

A study of an Architecture of Digital Twin Ship with Mixed Reality

  • Lee, Eun-Joo;Kim, Geo-Hwa;Jang, Hwa-Sup
    • 한국항해항만학회지
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    • 제46권5호
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    • pp.458-470
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    • 2022
  • As the 4th industrial revolution progresses, the application of several cutting-edge technologies such as the Internet of Things, big data, and mixed reality (MR) in relation to autonomous ships is being considered in the maritime logistics field. The aim of this study was to apply the concept of a digital twin model based on Human Machine Interaction (HMI) including a digital twin model and the role of an operator to a ship. The role of the digital twin is divided into information provision, support, decision, and implementation. The role of the operator is divided into operation, decision-making, supervision, and standby. The system constituting the ship was investigated. The digital twin system that could be applied to the ship was also investigated. The cloud-based digital twin system architecture that could apply investigated applications was divided into ship data collection (part 1), cloud system (part 2), analysis system/ application (part 3), and MR/mobile system (part 4). A Mixed Reality device HoloLens was used as an HMI equipment to perform a simulation test of a digital twin system of an 8 m battery-based electric propulsion ship.

이중 박동성 인공심폐기(Twin-Pulse Life Support, T-PLS)를 이용한 심폐순환보조 (Extracorporeal Life Support with a Twin-pulse Life Support (T-PLS) System)

  • 이동협;이장훈;정태은
    • Journal of Chest Surgery
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    • 제40권7호
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    • pp.512-516
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    • 2007
  • 기계적인 순환보조장치는 급성호흡부전이나 심부전에서 생명을 구할 수 있는 방편의 하나이다. 현재 여러 가지 형태의 순환 보조장치가 있으며 Twin-Pulse Life Support (T-PLS) system은 박동형 펌퍼의 한 종류다. 3예의 심한 심폐기능부전 상태 환자에게 순환보조장치로 T-PLS system을 사용하였다. 적응증은 인공호흡기와 강심제를 최대한 사용함에도 불구하고 지속되는 호흡부전이나 심부전이었다. 감염에 의한 호흡부전환자가 2예, 심근염에 의한 심부전 환자가 1예였다. 각각 한 명의 호흡부전환자와 신부전 환자가 생존하였는데 보조장치의 사용시간은 각각 3일과 5일이었다. T-PLS system은 순환보조장치로 유용하게 사용할 수 있으며 다발성 장기부전이 오기 전에 적용하여야 할 것으로 생각된다.

재난 감시 디지털 트윈을 위한 UWB 실내 측위 및 실시간 원격제어 시스템 구현 (Implementation of UWB Indoor Positioning and Real-time Remote Control System for Disaster Monitoring based on Digital Twin)

  • 유다송;김원석
    • 한국멀티미디어학회논문지
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    • 제24권12호
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    • pp.1682-1692
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    • 2021
  • Digital Twin, one of the core technologies of the Fourth Industrial Revolution, is attracting attention as a very suitable technology for disaster monitoring such as fires and earthquakes. In this paper, we implement a system equipped with UWB RTLS(Ultra-Wideband Real Time Location System), real-time remote control, and video streaming, which are element technologies for disaster monitoring digital twin. Since the proposed system structure is based on a cloud server, the actual location of the UWB indoor positioning-based client is transmitted to the user device in real time and stored on the cloud server for statistical and data analysis. In addition, we demonstrate through experiments that outliers occurs when the value of RSSI(Received Signal Strength Indicator) decreases due to communication collisions between UWB Tags, and propose an RSSI outlier correction algorithm to solve this problem.

상황 인지 기술과 모바일 단말 관리 기술을 이용한 비인가 단말 탐지 및 차단 기법 (A Scheme for Detecting and Preventing an Unauthorized Device Using Context Awareness and Mobile Device Management)

  • 문지만;정수환
    • 한국통신학회논문지
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    • 제39C권1호
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    • pp.1-8
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    • 2014
  • 본 논문에서는 AP와 모바일 단말을 이용하여 내부 네트워크의 정보 유출 및 변조를 방지하고 비인가 단말의 탐지 및 접속 차단을 하는 방법을 제안한다. 기존의 비인가 단말 탐지 및 차단 기법은 Evil Twin과 같은 형태의 탐지 기법이 주를 이루고 있다. 그러나 기존의 연구들은 다양한 형태로 발생하는 보안 사고를 모두 해결할 수 없으며 다양한 환경의 네트워크에서 효과적으로 대응하는데 문제가 있다. 이러한 문제를 해결하기 위해 기업에서는 다양한 정책과 가이드라인을 통해 대비를 하지만 꾸준히 늘어나는 보안 문제로 인해 모든 것을 대비하기는 어려운 상황이다. 본 논문에서는 위의 문제를 해결하기 위해 상황 인지 기술과 모바일 단말 관리 기술 기반의 비인가 단말 탐지 및 차단 기법을 제안한다. 먼저, 모바일 단말이 내부 네트워크의 진입을 시도할 때 모바일 단말의 상황정보를 인지하여 모바일 단말의 접속 허가 여부 및 권한을 판별하고 이 결과 값을 이용하여 모바일 단말에게 알맞은 관리 기술을 적용하여 내부 데이터 유출 및 침해를 방지한다.

Deep Submicron급 CMOS 디바이스에서 Triple Well 형성과 래치업 면역 향상에 관한 연구 (A Study on Improvement Latch-up immunity and Triple Well formation in Deep Submicron CMOS devices)

  • 홍성표;전현성;강효영;윤석범;오환술
    • 전자공학회논문지D
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    • 제35D권9호
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    • pp.54-61
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    • 1998
  • Deep submicron급 CMOS디바이스에서 래치업 면역특성을 향상시키기 위한 새로운 Triple well구조를 제안하였다. Triple well에서 이온주입 에너지와 도즈량 변화에 따른 최적인 래치업 면역을 위한 공정조건을 확립하고 이것을 기존의 Twin well구조와 비교분석하였다. 공정은 공정시뮬레이터인 ATHENA로 소자를 제작하여 도핑프로파일과 구조를 해석하고 래치업 특성은 소자시뮬레이터인 ATLAS를 사용하였다. Triple well과 Twin well의 구조에서 공정상의 차이가 도핑프로파일에 미치는 영향과 프로파일 형태가 래치업 특성에 미치는 영향을 규명하였다. Triple well구조에서 p-well이온주입에너지 2.5MeV, 도즈량 1×10/sup 14/[cm/sup -2/]일 때 트리거 전류가 2.5[mA/${\mu}{m}$]로 매우 큰 래치업 면역특성을 얻었다.

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강체전차선로 이행구간 Heavy Simple Catenary 적용을 위한 압상량 고찰 (A Study on the Uplift for Applying of Heavy Simple Catenary System in a Overhead Rigid Conductor Rail Transition Section)

  • 김완일;박원찬;이재봉;김재문
    • 전기학회논문지
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    • 제67권5호
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    • pp.688-694
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    • 2018
  • The transition section of the overhead rigid conductor rail (ORCR) consists of a direct induction device and a limit point to prevent the power supply failure and failure of the electric railway vehicle pantograph due to the difference of the uplift in the catenary line. In T-Bar transition section, a twin simple catenary is mostly installed between the overhead catenary system (OCS) in the ground section and the ORCR in the underground section. In this paper, we compare and analyze the possibility of replacing the twin simple catenary with heavy simple catenary. The reliability of numerical analysis results was confirmed by comparing field test with numerical results. Comparing the numerical results of the twin simple catenary with the heavy simple catenary in the transition section, the difference uplift is 5.9[mm] on average. When applying heavy simple catenary instead of twin simple catenary, the slight difference of uplift can be compensated by adjusting the height of hanger-ear or support bracket.

이유체 노즐 미립화 특성이 요소 열분해에 미치는 영향 (Effect of Atomization Characteristics of Twin Fluid Nozzle on Urea Pyrolysis)

  • 구건우;정경열;윤현진;석지권;홍정구
    • 한국분무공학회지
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    • 제20권3호
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    • pp.162-167
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    • 2015
  • Recently, there has been rising interest in applying urea-SCR systems to large marine diesel engines because the International Maritime Organization (IMO) has decided to enforce NOx reduction regulations. Generally, in the case of urea-SCR of the marine diesel engine, a type of twin fluid atomizer has been using for injection of the urea solution. This study conducted to investigate an effect of the atomization of external-mixing twin fluid nozzle on the conversion efficiency of reductant. The lab-scaled experiment device was installed to mimic the urea-SCR system of the marine diesel engine for this study. In a low temperature inflow gas condition which is similar with the exhaust temperature of large marine diesel engine, this study found that the conversion efficiency of reductant of when relative big size urea solution droplets are injected into exhaust gas stream can be larger than that of when small size urea solution droplets are injected. According to results of this study, the reason was associated with decrease of reaction rate constant caused from temperature drop of inflow gas by assist air of twin fluid atomizer.

소프트웨어 개발 방법론에 따른 양배수장 디지털 트윈 시스템 개발과정 고찰 (Exploration of Water Pumping Station Digital Twin System Development Process According to Software Development Methodologies)

  • 이병준;김난영;윤성수
    • 한국농공학회논문집
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    • 제66권3호
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    • pp.53-62
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    • 2024
  • The purpose of this study is to examine the methodology for applying digital twin technology to pumping station, identify the factors to be determined at each stage, and present its applicability. When analyzing the requirements for developing a digital twin for pumping station, they were categorized into service requirements, IoT device requirements, and gateway requirements, with a total of 39 requirements established. In system design, it was structured according to the principles of modularity, abstraction, stepwise decomposition, and information hiding, allowing the implementation of planned items for diagnosis and operational management. There are difficulties in setting communication-related protocols and applying them in the field due to the complexity of overseeing the entire system with data. Therefore, it is necessary to clarify the purpose of the system, and there are challenges in identifying the characteristics of individual facilities, such as pumps in pumping station, and fully incorporating them into the system process. Thus, the framework of the initial design is crucial for implementing a digital twin.

대규모 디바이스의 자율제어를 위한 EdgeCPS 기술 동향 (EdgeCPS Technology Trend for Massive Autonomous Things)

  • 전인걸;강성주;나갑주
    • 전자통신동향분석
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    • 제37권1호
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    • pp.32-41
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    • 2022
  • With the development of computing technology, the convergence of ICT with existing traditional industries is being attempted. In particular, with the recent advent of 5G, connectivity with numerous AuT (autonomous Things) in the real world as well as simple mobile terminals has increased. As more devices are deployed in the real world, the need for technology for devices to learn and act autonomously to communicate with humans has begun to emerge. This article introduces "Device to the Edge," a new computing paradigm that enables various devices in smart spaces (e.g., factories, metaverse, shipyards, and city centers) to perform ultra-reliable, low-latency and high-speed processing regardless of the limitations of capability and performance. The proposed technology, referred to as EdgeCPS, can link devices to augmented virtual resources of edge servers to support complex artificial intelligence tasks and ultra-proximity services from low-specification/low-resource devices to high-performance devices.