• Title/Summary/Keyword: Transmission Source

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Analysis on the Vibration Transmission Characteristics of the Standard Test Building by Using Standard Impact Source (경량 및 중량 충격원에 의한 표준 실험동의 진동전달 특성 분석)

  • Jin, Pil-Hwa;Kim, Heung-Sik;Kim, Do-Heong
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2006.11a
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    • pp.371-371
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    • 2006
  • The purpose of this study is to provide a fundamental data for efficient and economical reduction method and predict ion method of floor impact noise. In order to get the useful results, the measurement on the vibration transmission characteristics of standard test building with four rooms by using heavy and light-weighed impact source were carried out. In this measurement various conditions such as the change of test structure construction, the pick-up sensor location, the excitation posit ion, and the resilient material types were applied to get the vibration characteristics transmitted from excitation room to adjacent rooms.

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Energy-efficient data transmission technique for wireless sensor networks based on DSC and virtual MIMO

  • Singh, Manish Kumar;Amin, Syed Intekhab
    • ETRI Journal
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    • v.42 no.3
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    • pp.341-350
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    • 2020
  • In a wireless sensor network (WSN), the data transmission technique based on the cooperative multiple-input multiple-output (CMIMO) scheme reduces the energy consumption of sensor nodes quite effectively by utilizing the space-time block coding scheme. However, in networks with high node density, the scheme is ineffective due to the high degree of correlated data. Therefore, to enhance the energy efficiency in high node density WSNs, we implemented the distributed source coding (DSC) with the virtual multiple-input multiple-output (MIMO) data transmission technique in the WSNs. The DSC-MIMO first compresses redundant source data using the DSC and then sends it to a virtual MIMO link. The results reveal that, in the DSC-MIMO scheme, energy consumption is lower than that in the CMIMO technique; it is also lower in the DSC single-input single-output (SISO) scheme, compared to that in the SISO technique at various code rates, compression rates, and training overhead factors. The results also indicate that the energy consumption per bit is directly proportional to the velocity and training overhead factor in all the energy saving schemes.

Study on the characteristics of multi-wavelength source using phase-shifted fiber Bragg grating (위상천이 광섬유 브래그 격자를 이용한 다파장 광원 특성 연구)

  • Lee, Yong-Kyu;Min, Sung-Sik;Chae, Tae-Il;No, Young-Wook;Yoo, Hak;Min, Hyun-Dong;Yang, Mi-Sung;Ko, Je-Soo;Won, Yong-Hyub;Lee, Jong-Hyun
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.02a
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    • pp.76-77
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    • 2000
  • Very narrow transmission peaks are generated by the phase-shifted fiber Bragg grating with phase-shift region. The width of the transmission peaks are about ~0.5nm. The characteristics of multi-wavelength source using the phase-shifted fiber Bragg grating are designed and analyzed. The source with two and three transmission peaks is analyzed (omitted)

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Experimental Study on Performance Tests of Vibration Source for Helical Gears (헬리컬 기어계의 가진원 성능 평가에 대한 실험적 연구)

  • Park, Gwang-Min;Kim, Chan-Jung;Lee, Jae-won;Lee, Bong-Hyun;Kim, Wan-soo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.602-603
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    • 2014
  • A gearbox can be regarded as a self-exciting dynamic system, which has a vibration source. Transmission error (TE) is considered to be an main excitation source for gear noise and vibration. The TE excitation is transmitted through the gears, shafts, bearings, and housings. Thus, an experimental approach to each mechanical parts is useful in order to understand and evaluate the dynamic behaviour of a gearbox. This study is focused on the transmission and vibration characteristics of a helical gear system in development stage. In addition, by considering the tolerance factors and resonance characteristics, the vibration response of actual dynamic system is analysed.

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Secure Transmission for Two-Way Vehicle-to-Vehicle Networks with an Untrusted Relay

  • Gao, Zhenzhen
    • IEIE Transactions on Smart Processing and Computing
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    • v.4 no.6
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    • pp.443-449
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    • 2015
  • This paper considers the physical layer security problem for a two-way vehicle-to-vehicle network, where the two source vehicles can only exchange information through an untrusted relay vehicle. The relay vehicle helps the two-way transmission but also acts as a potential eavesdropper. Each vehicle has a random velocity. By exploiting the random carrier frequency offsets (CFOs) caused by random motions, a secure double-differential two-way relay scheme is proposed. While achieving successful two-way transmission for the source vehicles, the proposed scheme guarantees a high decoding error floor at the untrusted relay vehicle. Average symbol error rate (SER) performance for the source vehicles and the untrusted relay vehicle is analyzed. Simulation results are provided to verify the proposed scheme.

Equivalent Optical Bandwidth of Reflective Electro-Absorption Modulator Based Optical Source with a Broadband Seed Light for a 2.5 Gb/s and Beyond Signal Transmission

  • Kim, Chul Han
    • Journal of the Optical Society of Korea
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    • v.19 no.4
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    • pp.371-375
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    • 2015
  • The impact of equivalent optical bandwidth on the performance of a system using a reflective electroabsorption modulator (R-EAM) based optical source has been experimentally evaluated with signals operating at 2.5 Gb/s and beyond. The equivalent optical bandwidth of our source with a broadband seed light was simply adjusted by using a bandwidth tunable optical filter. From the measurements, we have estimated the required equivalent optical bandwidth of our source for an error-free transmission (@ bit-error-rate of $10^{-12}$) and a forward error correction (FEC) threshold of $2{\times}10^{-4}$.

Development and Evaluation of Multi-Wavelength Excitation light Source for Fluorescence Imaging to Diagnose Malignancies (악성종양의 형광영상 진단을 위한 다파장 여기광원장치의 개발과 평가)

  • Lim, Hyun-Soo
    • Journal of Biomedical Engineering Research
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    • v.30 no.2
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    • pp.113-121
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    • 2009
  • This study aims at designing and evaluating light source devices that can stably generate light with various wavelengths in order to make possible PDD using a photosensitizer and diagnosis using auto-fluorescence. The light source was a Xenon lamp and filter wheel, composed of an optical output control through Iris and filters with several wavelength bands. It also makes the inducement of auto-fluorescence possible because it is designed to generate a wavelength band of 380-420nm, 430-480nm, and 480-560nm. The transmission part of the light source was developed to enhance the efficiency of light transmission. To evaluate this light source, the characteristics of light output and wavelength band were verified. To validate the capability of this device as PDD, the detection of auto-fluorescence using mouse models was performed.

Transmission Line Fault Location Algorithm Using Estimated Local Source Impedance (자기단 전원임피던스 추정을 이용한 송전선 고장점표정 알고리즘)

  • Kwon, Young-Jin;Kim, Su-Hwan;Kang, Sang-Hee
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.58 no.5
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    • pp.885-890
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    • 2009
  • A fault location algorithm using estimated local source impedance after a fault is proposed in this paper. The method uses after fault data only at the local end. It uses the negative sequence current distribution factor for more accurate estimation. The proposed algorithm can keep up with the variation of the local source impedance. Therefore, the proposed algorithm especially is valid for a transmission line interconnected to a wind farm that the equivalent source impedance changes continuously. The performance of the proposed algorithm was verified under various fault conditions using the Simpowersystem of MATLAB Simulink. The proposed algorithm is largely insensitive to the variation in fault distance and fault resistance. The test results show a very high accurate performance.

Static Stability Analysis Using Voltage Source Converter HVDC (전압형 컨버터 HVDC를 이용한 정적 안정도 해석)

  • Chae, Byung-Ha;Oh, Sae-Shung;Jang, Gil-Soo;Lee, Byung-Jun;Han, Byung-Mun;Cha, Jun-Min;Kim, Chan-Ki
    • Proceedings of the KIEE Conference
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    • 2004.11b
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    • pp.66-68
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    • 2004
  • The current source HVDC using thyristor valves requires the reactive power compensator, the increasement of short circuit ratio(SCR) by AC source, and the harmonic filter in power transmission. The voltage source HVDC that controls active power and reactive power independently can minimize the requirements and also can be used as a reactive power source without additional reactive power compensators. In this paper, the solution of supplying active power using direct current transmission and compensating additional reactive power at the heavy load zone in metropolitan area is proposed and verified by simulations.

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Transmission Loss Prediction of KHST′s Wall (KHST 차량 벽면의 투과손실값 예측)

  • Kim, Kwanju;Taejung Yoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2002.11a
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    • pp.317.2-317
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    • 2002
  • Transmission loss of KHST passenger vehicle was calculated using measured acoustic data: In order to verify the transmission loss results for KHST case, similar experiment was carried out in laboratory condition, which result was compared those by geometric acoustic method. The computational results shows good agreement with the transmission loss magnitude from experiments. This paper also mentions items to obtain more accurate transmission loss values, i. e. how to assure reverberant field condition, the selection of source speaker' location.

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