• Title/Summary/Keyword: Wave verification

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Development of WAVE Networking Service Protocol for RSU(Road-side Unit) (RSU를 위한 WAVE 네트워킹 서비스 프로토콜 개발)

  • Ju, Hong-Taek;Ko, Kang-Min;Kwon, Dong-Woo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37 no.5B
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    • pp.395-404
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    • 2012
  • In this paper, we analyze and develop standard protocols for WAVE Networking Services described by IEEE 1609.3 which is one of standards for Intelligent Transportation Systems. In particular, we develop 'WAVE Management Entity(WME)' and 'WAVE Short Message Protocol(WSMP)'. For verification of development, we also develop Traffic Management System and RSU Manager, then we present results of verification by Traffic Management System in the car accident scenario.

Modeling of Wave Breaking in Spectral Wave Evolution Equation (스펙트럼 파랑모형에서의 쇄파모형)

  • Cho, Yong-Jun;Ryu, Ha-Sang
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.19 no.4
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    • pp.303-312
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    • 2007
  • There is still a controversy going on about how to model energy dissipation due to breaking over frequency domain. In this study, we unveil the exact structure of energy dissipation using stochastic wave breaking model. It turns out that contrary to our present understanding, energy dissipation is cubically distributed over frequency domain. The verification of proposed model is conducted using the acquired data during SUPERTANK Laboratory Data Collection Project (Krauss et al., 1992). For further verification, we numerically simulate the nonlinear shoaling process of Conoidal wave over a beach of uniform slope, and obtain very promising results from the viewpoint of a skewness and asymmetry of wave field, usually regarded as the most fastidious parameter to satisfy.

Channel Modeling and RF Performance Verification in mmWave Bands Based on NS-3 (NS-3 기반의 mmWave 대역 채널 모델링 및 RF 성능 검증)

  • Seung-Min Lee;Jun-Seok Seo;Hong-Je Jang;Myung-Ryul Choi
    • Journal of IKEEE
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    • v.27 no.4
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    • pp.650-656
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    • 2023
  • This paper implements a channel model for mmWave bands using an NS-3-based 5G system-level simulator and analyzes the reliability and validity of the implemented model through RF performance verification. The channel model for RF performance verification in the mmWave bands consider parameters such as characteristics defined in 3GPP TR 38.901, beam-forming, antenna configuration, scenarios, among others. Furthermore, the simulation results verify compliance within the ranges permitted by the 3GPP standards and verify reliability in indoor environmental scenarios by exploiting the Radio Environment Map (REM). Therefore, the channel model implemented in this study is applicable to the actual design and establishment of 5G networks, presenting a method to evaluate and validate RF performance by adjusting various parameters.

Experimental Verification on the Stability and Sound Pressure Transmission Coefficient of Surface SH-Wave (표면 SH파의 음압 통과율과 에코 안정성에 관한 실험적 검증)

  • 이명호
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.2
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    • pp.23-30
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    • 2003
  • It is very important to detect and evaluate the surface or subsurface flaws because of their influences on mechanical properties of materials. Rayleigh wave and creeping wave are commonly used for the detection of surface and subsurface flaws. These techniques, however, have following problems. Each amplitudes are remarkably affected by the surface condition and evaluation of echo pattern is usually difficult because shear wave mode propagate in the material at the same time. On the other hand, surface SH-wave which is horizontally polarized shear wave traveling along near surface layer is an attractive technique for the surface or subsurface material characterization and this technique is useful to solve the problems mentioned above. In this paper, The stability and transmission coefficient of SH waves through a viscous fluid layer is theoretically studied and simulated. Its results agreed well with the theoretical expectation for the experimental verification. These experimental results show that viscosity of couplants, thickness of couplant and surface roughness are closely related to transfer efficiency in surface SH angle beam method.

3-Dimensional Analysis for Nonlinear Wave Forces Acting on Dual Vertical Columns and Their Nonlinear Wave Transformations (복수 연직 주상구조물에 작용하는 비선형파력과 구조물에 의한 비선형파랑변형의 3차원해석)

  • Lee, Kwang-Ho;Lee, Sang-Ki;Shiin, Dong-Hoon;Kim, Do-Sam
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.20 no.1
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    • pp.1-13
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    • 2008
  • In the present work, wave transformation by vertical columns and its wave forces acting on them are discussed using a direct 3-D numerical model based on the VOF (Volume Of Fluid) method. The numerical results for wave transformations and wave forces are critically compared to an advanced experimental data, and provide the verification of the numerical model used in the present study. Overall model-data comparisons are good. After verification of the numerical model, it is used to simulate wave fields around dual vertical columns with arbitrary cross section, and the characteristics of nonlinear wave forces and wave transformations according to the variations of different cross section types of vertical columns, an interval of vertical columns and incident wave angle are discussed.

Adaptive Re-reflecting Wave Control In Plunger Type Wave Maker System: Experiments In Two Dimensional Wave Basin

  • Park, Gun-Il;Kim, Ki-Jung;Park, Jae-Woong;Lee, Jin-Ho
    • Journal of Ship and Ocean Technology
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    • v.7 no.1
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    • pp.13-18
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    • 2003
  • The control performances for active re-reflecting wave control suggested in the previous paper have been verified in cases of regular and irregular waves in a real two dimensional wave basin. For regular waves, the control performances are investigated in terms of reflection coefficients, expected amplitudes of propagating waves and wave absorbing capabilities after cessation of wave generation, compared with those of no-control cases. For irregular waves similar verification procedures were adopted. Though there are certain constraints due to the geometrical non-linearity of wave maker and certain nonlinear characteristics due to the near field and gravity waves these experiments show that the control logic could be useful in realizing re-reflecting wave control in conditions of real wave basin.

Design and Verification of a Wave Gauge Using Digital Images (디지털 영상을 이용한 파고계 개발 및 검증)

  • Kim Taerim
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.16 no.3
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    • pp.171-177
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    • 2004
  • A new wave gauge using digital image of waves is developed and the performances are tested by wave tank experiments. This wave gauge uses frame frequency of 1/15 sec, conversion of analog images to digital images, and large capacity of hard disk. This wave gauge measures wave heights by detecting the buoy movement automatically from the image, where the buoy moves with the same phase of water surface. The comparison of automatic measurements of wave heights to the true data is reasonable. The wave gauge can be improved to measure wave heights on shallow waters near shorelines.

The Implementation of Hardware Verification System Using Fault Injection Method (결함 주입 방법을 이용한 하드웨어 검증시스템 구현)

  • Yoon, Kyung-Shub;Song, Myoung-Gyu;Lee, Jae-Heung
    • Journal of IKEEE
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    • v.15 no.4
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    • pp.267-273
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    • 2011
  • In hardware design, its stability and reliability are important, because a hardware error can cause serious damages or disaster. To improve stability and reliability, this paper presents the implementation of the hardware verification system using the fault injection method in PC environment. This paper presents a verification platform that can verify hardware system reliably and effectively, through a process to generate faults as well as insert input signals into the actual running system environment. The verification system is configured to connect a PC with a digital I/O card, and it can transmit or receive signals from the target system, as a verifier's intention. In addition, it can generate faults and inject them into the target system. And it can be monitored by displaying the received signals from the target system to the graphical wave signals. We can evaluate its reliability by analyzing the graphical wave signals. In this paper, the proposed verification system has been applied to the FPGA firmware of a nuclear power plant control system. As a result, we found its usefulness and reliability.

Experimental Study in Kinematics of Rogue Wave

  • Choi, Hae-Jin;Jung, Kwang-Hyo;Suh, Sung-Bu;Lee, Seung-Jae;Jo, Hyo-Jae;Choi, Han-Suk
    • Journal of Ocean Engineering and Technology
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    • v.25 no.3
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    • pp.11-18
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    • 2011
  • The rogue wave was generated in a two-dimensional wave tank the rogue wave kinematics was investigated including local and convective accelerations of the water particle and verification of existing prediction methods. PIV technique was applied to measure the wave kinematics near the wave crest which extended to compute the local and convective accelerations. The experimental results were compared with several analytical predictions. The convective acceleration under the crest of rogue wave has a similar magnitude with the local acceleration.

Study on active vibration control based on wave viewpoint using the longitudinal wave separation method (종파 분리 방법을 이용한 파동 관점의 능동 진동 제어)

  • Jung, Byung-Bo;Park, Young-Jin;Park, Youn-Sik
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2007.05a
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    • pp.928-933
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    • 2007
  • In this research, we investigated active vibration control based on wave-viewpoint using the longitudinal wave separation method. The control strategy is the one of active vibration control technique for generating vibration reduced zone and uses wave information including the directivity as the cost function. In order to get the wave information from the measured values, we proposed and examined the time-domain longitudinal wave separation method proper to real time application like active vibration control. Using the proposed method, we examine the performance and feasibility of active vibration control based wave view-point through the simulation. The related experimental verification and application is going to be expected in a near future.

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