• 전자공학회논문지A
• /
• 제33A권7호
• /
• pp.15-22
• /
• 1996

In the soliton transmission system for a long-length and high bit rate data transmission systme using the nonlinear/dispersive optical fibers, the improtant problem is the loss characteristics and is the limited transmission rate by interaction forces. In this paper, It is explained the reasons of moved time position for the soliton peak value due to interaction force sof adjacent solitons. And for the analysis of interaction force affection level in the losslessmedia, we define the percent parameter of error rate due to the interaction forces and propose the optimum time distance of adjacent solitons by peak value tracking methods. With the results, initial percent of error is approximately 50% when itme difference between adjacent solitons is 5 times of funddametnal soliton pulse width. And it is confirmed that maximum transmission length of th esolitons is approximately 38 times of fundamental soliton period, which the maximum allowable percoent of error is 50%.

• 한국통신학회논문지
• /
• 제28권4A호
• /
• pp.232-237
• /
• 2003

이 논문에서는 부하가 걸려 있는 전송 선로의 길이가 변화할 경우 입력반사 계수가 스미스차트 상에서 그리는 쾌적의 방정식을 유도한다. 결과에 따르면, 전송 선로의 특성 임피던스가 정규화 임피던스와 다를 경우 쾌적은 원을 그리게 되며, 그 원의 중심과 반지름은 부하의 임피던스와 전송 선로의 특성 임피던스에 의해 결정된다. 이 결과는 마이크로스트립 선로를 사용하여 정합 회롤를 설계할 때 선로의 길이와 너비를 조정할 필요가 있을 경우 유용하게 사용될 수 있다.

• 한국기계가공학회지
• /
• 제11권2호
• /
• pp.40-46
• /
• 2012

In this study, numerical analysis was conducted to understand the flow characteristics of lubrication system in a manual transmission installed in a commercial vehicle. Also, the analysis was conducted with the purpose of improving the heat and lubricative condition of the transmission. Discharging flow rates on each oil hole outlet according to various engine rotating speed and the length of oil hole branch was calculated. In conclusion, as engine rotating speed is high and the length of oil hole branch is long, the discharging flow rate is high by virtue of the centrifugal force. In addition, this study proposed data for optimal design of lubrication system in manual transmission for a commercial vehicle.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1997년도 하계학술대회 논문집 E
• /
• pp.1731-1733
• /
• 1997

The first 150lkV underground transmission line of Korea was installed between Danginri and Yongsan substation in 1974. Since then, the underground transmission lines of about 720 circuit-km had been installed up to 1995. As the national economy has been enlarged and the population of city has been rapidly increased, the demand of an electric power has been very increased. Therefore the first 345kV long-length transmission line of Korea was installed between Mikyum and Sungdong substation on Jan., 1997. This paper describes the design of the 345kV oil-filled cable and its accessories, the design of the system, the methods of installation, field tests, and the future trends of the underground transmission line in Korea.

• Journal of the Optical Society of Korea
• /
• 제16권2호
• /
• pp.95-100
• /
• 2012

We show that the minimum EOP (eye-opening penalty) obtained by tunable dispersion compensation is a function of a figure of merit for a nonlinear process, $I_0L_{eff}$, where $I_0$ is the optical intensity and $L_{eff}$ is the effective length of the interaction region. Using this rule, we do not need to conduct nonlinear simulations in all the cases of signal power and transmission length to obtain the signal distortion in dispersion-managed optical transmission. Instead, we need to conduct a simulation in only one case of a signal power and find the functional relation, and then we can obtain the values of the signal distortion in other cases using the discovered functional relation. This technique can reduce the number of nonlinear simulations to less than 10%.

• 전기학회논문지
• /
• 제59권2호
• /
• pp.262-266
• /
• 2010

During the restoration process of primary restorative transmission system, the over voltage may happen due to nonlinear interaction between the unloaded transformer and the transmission system. This over voltage is caused by harmonic resonance and can be prevented by damping loads that are connected before restoration process of primary restorative transmission system. But it is very difficult to predict the occurrence possibility of the harmonic resonance previously. This paper analyzes the relationship between the harmonic resonance and the amount of damping loads to prevent the harmonic resonance. This paper calculates the minimum amount of damping loads to prevent harmonic resonance while changing the length of primary restorative transmission line. And this paper confirmed that the amount of damping loads is not proportional to length of transmission line. The result of this paper will be used as important experiment data to predict the occurrence possibility of harmonic resonance previously.

• 한국컴퓨터산업학회논문지
• /
• 제2권2호
• /
• pp.131-140
• /
• 2001

본 논문은 지상회선과 위성회선의 파일 전송을 위하여 CSDN 접속의 지상회선 모델인 SARA(System ARchitec’ Apprentice)모델에 위성회선을 추가하여 확장된 시뮬레이터를 제안하고 두 회선의 파일전송 효율에 대하여 해석하였다. 위성전송에서 파일전송의 효율을 평가하기 위하여 해석적 방법과 제안된 시뮬레이터로서 파일전송의 시뮬레이션을 수행하였다. 이때 적용된 전송파라미터는 단위 메시지 길이와 파일의 전송시간, 체인 레코드 수와 전송시간으로 하여 위성회선의 최적 메시지 길이를 평가하였다. 평가 결과는 위성회선에서 단위 메시지 길이를 512바이트 보다 짧게 하면 파일 전송시간은 극단적으로 길게 되며,1024바이트로 했을 때 최소로 되고 2048바이트부터 급격하게 증가되었다. 이 결과에서 최적 단위 메시지길이는 1024바이트 부근이라는 것을 확인할 수 있었다.

• 대한전기학회논문지:전기물성ㆍ응용부문C
• /
• 제52권9호
• /
• pp.383-387
• /
• 2003

In this paper, we have studied about optimal transmission efficiency characteristics of pulse energy in a coal plant for removing environmental polluted gas. The electrical efficiency of pulse power systems depends on impedance of the reactor. To obtain high efficiency, we used MPC(Magnetic pulse compressor) as the power switch and tested their characteristics as electrode length of the reactor and charging voltage of capacitor, As results, we obtained a compressed pulse such as pulse voltage of 10㎸, rising time 200ns and pulse width of 500ns. With increasing electrode length, the load impedance was decreased but the electrical efficiency was increased.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
• /
• pp.398-402
• /
• 2008

Cyclic prefix (CP) is one of the most important technique to OFDM system and is reducing inter-symbol interference (ISI) effects in high speed wireless mobile communication system. At the time varying channel condition, however, fixed CP length is not only increasing power consumption but also reducing data transmission rate. So in this paper, we propose the system that has adaptive CP length for high speed data transmission system. We don't control CP length of every symbol but adjust symbol interval depending on channel condition to CP reconstruction.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2000년도 ITC-CSCC -1
• /
• pp.458-461
• /
• 2000

Variable length codes are often used in entropy coding, but are very vulnerable in noisy environments. Reversible variable length codes, however, muse possible to decode instantaneously in both forward and backward directions, so that more usable data can be retrieved when bit errors occur via transmission. Furthermore, partial decodability is desirable to introduce in the reversible variable length code because ROI (Region Of Interest) decoding function is sometimes required in recent image information systems such as the medical imaging, the digital museum and so on. In this paper, we propose a partially decodable and reversible variable length code by modifying Golomb-Rice code.