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安重守 忠州大學校 1998 한국교통대학교 논문집 Vol.33 No.2
This paper proposes the frequency diversity for a phase-coherent frequency-hopping spread spectrum system. The frequency band of the communicator is partitioned into L disjoint subbands on which L replicas of the communicator signal are simultaneously transmitted ; each signal replica hops independently in its subband. Therefore, both phase continuity and coherent optimal combining of the received replicas are possible. Optimum diversity is thus at least 6[dB] better than the noncoherent FH/SS system.
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Microprocessor로 제어되는 Thyristor 스위치
安重守 충주대학교 1984 한국교통대학교 논문집 Vol.18 No.1
Using μ- processor for digitol waveform control of power inverters Such as PWM inverters makes it possible to provide flexible waveform control. This includes selective control or elimination of higher harmonics to solve the wave form problems, thereby providing a flexible control system design that is almost impossible with conventional analog control systems. It has Varions merits, eogo, different characteristics can readly be realized by simply replacing the memory or changing the software program. Development of thyristor circuits has evolved around each circuit function or more often in accordance with the application field. The basic componento of most actine circuits canbe represented by the three - terminal switch (fig.12) This type of three - terminal switch designed To be turned on or off by μ- Processor software has superior general applicability as a thyristor circuit Elemint. Including the control circuit this will be called "Thyristor switch"
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安重守 충주대학교 1977 한국교통대학교 논문집 Vol.10 No.1
It was important to study on dynamic voltage distribution on contaminated insulator surfase as the basis of insulator design. Dynamic voltage distribution on an insulator unit was investigated before and during Scintillation activity. A symple method for measurments of voltage distribution was successfully developed. It was observed that some parts of the leakage distance do not function during scintillations, and there-fore the Concept of "effective leakage distance" was introduced. A good Correlationship between "effective leakage distance" and flashover voltage was found. This work is only a first step in determining the relationship between insulator design and performance at all voltage levels.
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부분대역 재밍하에서 자동검파를 이용한 FH/CPFSK 시스템의 성능분석
安重守,鄭根烈 충주대 산업과학기술연구소 1995 産業科學論文集 Vol.3 No.-
In this paper, the performances of FH/CPFSK system have been analyzed for thermal noise, partial-band jamming noise and adjacent interference of all eight bit pattern. The parameters to anlalize performances of FH/CPFSK system have been used the bit rate, modulation index and performances of FH/CPFSK system with the differential detector and with limiter-discriminator have been presented with optimum correlation function. In result, we can find that bit error probability of the approximation equation and the exact equation is nearly accorded in the high signal-to-noise ratio. And, ibis proved that FH/CPFSK system with differential detection according to jamming fraction γ was worst to 3dB than FH/CPFSK system with limiter-discriminator.
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AWGN하에서 DS/SS-QPSK 초기동기 시스템 성능 분석
안중수,홍성원 충주대 산업과학기술연구소 1997 産業科學論文集 Vol.5 No.-
It is important that to search the phases of the between received code and local code in spread spectrum communication system is decided the performance of system. In this paper, the morkovian chain property is used for the synchronization phase acquisition of DS/SS-QPSK system on the AWGN using the serial search fixed in low SNR and the PN codes which have large process gain. In result, We was analysis the SNR, detector threshold, chip false alarm probability, detection probability, mean acquisition time.
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安重守 忠州大學校 1999 한국교통대학교 논문집 Vol.34 No.2
This paper proposed the transmission of information symbols over an additive white Gaussian noise (AWGN) channel in the presence of band-limited Gaussian interference Performance improvement of FD/SS system using a suboptimum receiver with respect to the uncoded DS/SS system increase linearly with Jo/NO and with the jammer power J. The bit error probability of the FD/SS system is less than that of the FH/SS system using PSK modulation, the FD/SS system also outperforms FH/SS system that uses FSK modulation. In the presence of worst jammer in both FD/SS and FH/SS systems, a comparison shows the superiority of the FD/SS system.
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安重守 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2
Spread Spectrum,direct sequence, or Pseudonoise (PN) modulation is employed in digital communication system to reduce the effect of interference due to other users and intenional jamming. The interference immunity of a spread spectrum communication system corrupted by narrowband interference can be further improved by filtering the signal prior to cross-correlation of the received signal with the possible transmitted reference signals. This paper treats methods for excising narrowband interference in direct sequence spread spectrum system. Excision methods based on linear perdiction and linear filtering algorithms are shown to be particulary effective for DS/SS system corrupted by narrowband interference. Numerial results are presented on the performance of DS/BPSK with pulse jamming and rate 1/2 convolutional codes with soft -decision Viterbi decoding BPSK with optimal pulse jamming.
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安重守 忠州大學校 1994 한국교통대학교 논문집 Vol.29 No.2
The performance of cellular direct sequence code division multiple system is for both reverse and forward link situations. The results of analysed showed that the user capacity of both the reverse link and the forward link increased as the processing gain(G) increased and the voice activity(a) decreased. It was also found that the user capacity decreased for showed environments; the capacity was the greatest equaled to O (σ=O(dB)) and capacity decreased drastically when the values of σincreased, such as σ=2(dB),4(dB) ... Especially, It has been shown proved as I without any influnce from the parameter G and a.
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安重守 忠州大學校 1984 한국교통대학교 논문집 Vol.17 No.2
There are numerous industrial operations which require the delivery of a variable and controlled amount of electrical power. The SCR is small and relatively inexpensive, needs no maintenance, and wastes very little power. Some modern SCR can control currents of several hundred ampers in circuits operating at voltages high than 1000V. For these reasons, SCR are very important in the field of modern industrial control. In this paper, I studied on elimination the torque pulsation by the current instantaneorse value control method in squirrel cage induction motor fed with controlled current type inverter.
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