• Title/Summary/Keyword: Data transmisson

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A Study on Fault Location Using Wavelets in Transmission Line (송전선에서 Wavelets을 이용한 고장점 추정에 관한 연구)

  • Moon, Sung-Chall;Lee, Jong-Beom
    • Proceedings of the KIEE Conference
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    • 1999.07c
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    • pp.1360-1362
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    • 1999
  • This paper describes the fault location technique using wavelets in transmisson line. Estimation of fault location is performed using synchronized data sampled at two ends of line and travelling wave. The similar current wave modeled in PSCAD/EMTDC and MATLAB was applied to evaluate the accuracy of theory proposed in this paper. The results of fault location shown in this paper will be evaluated as an effective suggestion for fault location in real transmisson line

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AN ANALYSIS OF PARALLEL ROUTING ALGORITHM OF HYPERCUBE NETWORK BY EMPLOYING COVERING PROBLEM AND ASSIGNMENT PROBLEM

  • Chung, Il-Yong
    • Journal of applied mathematics & informatics
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    • v.4 no.2
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    • pp.535-543
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    • 1997
  • The application of Hadamard matrix to the paral-lel routings on the hypercube network was presented by Rabin. In this matrix every two rows differ from each other by exactly n/2 positions. A set of n disjoint paths on n-dimensional hypercube net-work was designed using this peculiar property of Hadamard ma-trix. Then the data is dispersed into n packets and these n packet are transmitted along these n disjoint paths. In this paper Rabin's routing algorithm is analyzed in terms of covering problem and as-signment problem. Finally we conclude that n packets dispersed are placed in well-distributed positions during transmisson and the ran-domly selected paths are almost a set of n edge-disjoint paths with high probability.

The Image Transmisson System Design using DSP and Wavelet (DSP와 웨이블릿을 이용한 영상 전송 시스템의 설계에 관한 연구)

  • 이명철;류광렬
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.205-208
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    • 2002
  • The stand-alone transmission system design on compressed still image using DSP processor and Wavelet is presented. The target system is based on 32bits DSP processor. The image is compressed with Wavelet. The system for NTSC format image signal is able to transmit still image data to be high speed and is applicable to a surveillance and inspection system independently.

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Analysis and Design of the Cylindrical-rectangular Patch Microstrip Resonator (원통면 사각패치 마이크로스트립 공진기 특성 해석 및 설계)

  • 이민수;이상설
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.16 no.10
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    • pp.925-933
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    • 1991
  • Caracteristics of cylindrical rectanyular patch microshtrip resonator are analyzed by cavity model. To minimize the error of resonant frequency due to fringing field, the resonant frequency is calcylated by the concept of effective dielectric constant. The transmisson type resonator operating at 3GHz is designed and manufactured. The measured data of the resonant frequency and reflection loss are 3.019Ghz and \ulcorner32.78dB respectively. These results nearly coincide with theoretical results.

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A study on the data transmission performance for the development of the telesounder based on LTE communication system (LTE 통신 시스템 기반의 원격 어군탐지기 개발을 위한 데이터 전송 성능에 관한 연구)

  • HEO, Gyeom;HWANG, Doo-Jin;KANG, Tae-Jong;SHIN, Hyeon-Ok
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.58 no.2
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    • pp.153-158
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    • 2022
  • A telesounder is a device that can monitor the appearance of fish in the sea on land and store fish detection data. This study was conducted to monitor the appearance of fish resources in coastal or near seas by using LTE communication for data transmission of the telesounder. The purpose of this study was to develop a prototype telesounder that can monitor the appearance of fish groups in the waters about 50 km away from the coast and store fish detection data. In this study, the prototype telesounder including a fish finder, communication device and battery for stable operation at sea was developed. The stability of telesounder buoy, data transmission/reception and expected use time were investigated. The expected use time of the telesounder using LTE communication with a lithium battery (12 V, 120 Ah) was about 274 hours under the conditions of 10 minutes off and 10 minutes on, about 520 hours under the conditions of 30 minutes off and 10 minutes on, and about 142 hours under continuous conditions. As a result of the sea test, it was found that the telesounder can be used in the sea area moved about 34 km from the land and the telesounder buoy was evaluated to have secured basic stability (buoyancy balance, waterproof, antenna strength, etc.) for operation in a marine environment.

Comparison of Driving Posture and Sensibility Differences between Transmission Modes and the Position of Pedals (차량의 변속형태에 의한 페달 위치에 따른 운전자세 비교 및 감성차이 분석 연구)

  • Jeon, Yong-Wook;Cha, Doo-Won;Park, Peom
    • Science of Emotion and Sensibility
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    • v.4 no.1
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    • pp.53-60
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    • 2001
  • As a part of HMS(Human-Machine System), the car is very important thing in common life. It is also a significant part to study on the controllers of car that is intentively related with all sensibilities during driving. There are lots of controllers on seating buck of the car. However, there are few study on the sensibility analysis of them. Most of all, the foot controller could be easily overlooked because it could be invisible. This study was based on relationship that the controllers fitted to the driving posture in the drivers' sensibility difference of two transmission modes, automatic and manual transmission. The results show the driver's preference driving posture and sensibility in two kinds of transmission cars. Consequently, it should be designed the seating buck for two different types respectively to be taken comfort driving posture and improve the safety for drivers. Also, it could reduce the fatigue and discomfort in the task of driving. The design of the controllers strongly effects on the drivers' response time. hereby this study was accessed to the sensibility of Korean with analyzing the relationship, quantitative data, and sensibility difference between two kinds of transmission cars.

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An Experimental Study on Power Transmission Characteristics Flow Rate in Fluid Couplings (유체커플링에서 유량과 동력전달특성에 관한 실험적 연구)

  • Pak, Yong-Ho;Moon, Dong-Cheol;Yum, Man-Oh
    • Journal of the Korean Society for Precision Engineering
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    • v.12 no.11
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    • pp.27-35
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    • 1995
  • The fluid coupling combined with a pump and a turbine have many merits compared with other couplings, their uses are increesing rapidly in various industrial fields at home and abroad in pursuit of high-speed more efficiency durability of various mechanic devices. The authorities concerned have recognized the improtance of the fluid coupling and supported its developement and now some trial products began to show up. As the structrue and characteristics of the fluid coupling have little similarity to other kinds of couplings and its fluid behavior is unique, so its characteristic analysis is expected to be difficult. Until now no satisfactory study on the characteristics of the fluid coupling seems to have been conducted at home, so a study on this field needs to be done urgently. The purpose of this research is to construct the experimental test set-ups and establish a series of performance test program for the domestically developed fluid couplings and to provide a software to store and utilize these experimental data which can be used to improve the performance of the fluid coupling and solve on the job problems confronted in operation. The performance test consists of taking measurment of torque, rpm and efficiency of the fluid coupling for three different amount of working fluid inside with various loads to the output shaft and finally infestigating the torque, rpm and efficiency characteristics of the fluid coupling with respect to these parameters. The results of this study can contribute valuable references to the development of variable speed fluid coupling and torque converter currently pursued by the domestic industry.

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