• Journal of the Korean Data and Information Science Society
• /
• v.27 no.5
• /
• pp.1241-1251
• /
• 2016

We consider a correlated discrete-time random walk in which the current jump size depends on the previous jump size and a noncorrelated discrete-time random walk where the jump size is determined independently. By using the strong law of large numbers of Markov chains we derive the formula for the asymptotic means of the random mixture and the periodic pattern of these two random walks and then we show that there exists Parrondo's paradox where each random walk has mean 0 but their random mixture and periodic pattern have negative or positive means. We describe the parameter sets at which Parrondo's paradox holds in each case.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.7 no.2
• /
• pp.93-106
• /
• 1997

Summation generator is a real adder generator with maximum period, near maximum linear complexity and maximum order of correlation immunity. But this generator has been analyzed by a correlation attack(a kind of known-plaintext attack), which confers carry bits from output sequences of consecutive 0's or 1's. As methods of immunizing carry-output correlation, an immunized summation generator which exclusively-ORed summation generator output with output of a stage of LFSR was proposed. But the immunized generator reuses the output of LFSR by k-bit later and does not garantees maximum period in special case. In this paper we proposed an improved summation generator with 2-bit memory and analyzed it.

• Journal of the Korean Society of Manufacturing Technology Engineers
• /
• v.9 no.5
• /
• pp.144-149
• /
• 2000

The demands for robotic and automatic system are continually increasing in manufacturing fields. There have been many studies to monitor and predict the system, but they have mainly focused upon measuring cutting force, and current of motor spindle, and upon using acoustic sensor, etc. In this study, time series sequence of cutting force was acquired by taking advantage of piezoelectric type tool dynamometer. Radial cutting force was obtained from it and was available for useful observation data. The parameter was estimated using PAA(parameter adaptation algorithm) from observation data. ARMA(auto regressive moving average) model was selected for system model and second order was decided according to parameter estimation. Uncorrelation test was also carried out to verify convergence of parameter.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
• /
• 1999.10a
• /
• pp.40-45
• /
• 1999

The demands for robotic and automatic system are continually increasing in manufacturing fields. There have been many studies to monitor and predict the system, but they have mainly focused upon measuring cutting force, and current of motor spindle, and upon using acoustic sensor, etc.In this study, time series sequence of cutting force was acquired by taking advantage of piezoelectric type tool dynamometer. Radial cutting force was obtained from it and was available for useful observation data. The parameter was estimated using PAA (parameter adaptation algorithm) from observation data. ARMA(auto regressive moving average) model was selected for system model and second order was decided according to parameter estimation. Uncorrelation test was also carried out to verify convergence of parameter.

• The KIPS Transactions:PartC
• /
• v.10C no.7
• /
• pp.851-856
• /
• 2003

The LM generator is an improved summation generator with maximum period, near maximum linear complexity and maximum order of correlation immunity, and it has a property with the input-output correlation immunity In this paper, we propose the high-speed m-parallel LM-BSG and 8-parallel LM-BSG for detail as a design example. When compared with a conventional stream cipher, the properties of the proposed cipher exhibited the same crypto-degree (security) with a rt times faster processing.

• Journal of the Economic Geographical Society of Korea
• /
• v.14 no.3
• /
• pp.307-324
• /
• 2011

The culture industry is viewed as a driving industry in the 21th century. Korea has experienced the rapid growth rate of the cultural industry in terms of sale amounts for the period of 2004-2009. The purposes of this study are to analyze the spatial pattern of the cultural industry and to empirically examine the effect of municipalities' cultural industries on regional economy using SUR model. The major findings are as follows: First, cultural industries are concentrated in the capital region and several metropolitan areas. Secondly, the estimated result of SUR model shows that there is inter-relationship between cultural industry and regional economy. The effect of the cultural industry on GRDP is that the cultural industry increased 1%, GRDP increased by 0.46%. In turn, GRDP increased 1%, cultural industry increased by 0.75%. Thirdly, the elasticity of the cultural industry on GRDP is much higher than that of labor or capital stock, showing that the cultural industry has a more powerful influence on its regional economy. Fourth, the elasticity of the cultural industry on GRDP of Gun is higher than that of shi, indicating that it is rational for Gun to develop strategies to promote competitive power of the cultural Industry for regional economic growth.

• Proceedings of the Technology Innovation Conference
• /
• 2005.08a
• /
• pp.168-188
• /
• 2005

본 연구는 R&D가 경영성과에 미치는 영향에 대해 전기$\cdot$전자산업에 속한 중소기업과 벤처기업을 대상으로, 패널 데이터 (2001$\~$2003년)를 이용하여 실증분석하고, 중소기업과 벤처기업을 비교분석하였다. 실증분석 모델은 기업의 총매출액을 종속변수로 하고, R&D 투자액, 연구원 수, 자본금 총액, 종업원 수, 연구원 수를 제외한 종업원 수를 독립변수로 한 1차 선형함수를 설정하였다. 실증분석모델로는 패널분석 (임의효과모델, Random Effect Model)을 이용하였다. 실증분석 결과 중소기업과 벤처기업의 공통점은 첫째, R&D 인력과 그것을 제외한 종업원수가 경영성과에 대한 영향이 긍정적이라는 점 둘째, R&D 투자액 및 자본금이 기업의 경영성과에 긍정적인 영향을 주고 있다는 점을 들 수 있다. 실증분석 곁과의 차이점은 첫째, 중소기업의 경우 연구소 설립 연수와 기업 설립 연수가 기업의 경영성과와 무상관으로 나타났으나, 벤처기업의 경우 추정결과 1을 제외하면 모두 긍정적이고 유효했으며 둘째, 중소기업의 경우 자산효과와 자본금 효과가 긍정적이고 유효한 것으로 나타났으나, 벤처기업은 자산효과가 유효한 부정으로 나타났다. 따라서 기업은 인적자원의 확보, 육성, 활용 등의 전락에 의해 기업 경영성과가 크게 달라질 수 있고, 중소기업이나 벤처기업의 경우 자산의 팽창보다는 시장 경쟁력 향상을 위한 R&D투자에 좀 더 힘써야 할 것이다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
• /
• v.8 no.4
• /
• pp.275-280
• /
• 2015

In this paper, we studied for modified MUSIC algorithm of direction of arrival (DOA)estimation. Modified MUSIC algorithm search optimal covariance matrix using singular value decomposition and Bayes method, and desired signals are estimated by updating weight. In order to estimation of desired signals, we used sub spatial method of MUSIC algorithm. General MUSIC algorithm can estimate a desired signal in case of non-correlation signal. But, general MUSIC algorithm in case of correlation signal can not estimate a desired signals and resolution is decreased. Though simulation in case of correlation signal, we analyze to compare proposed MUSIC algorithm with general MUSIC algorithm.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.2 no.2
• /
• pp.241-248
• /
• 1998

The accurate measurement of the room sound level is required in environment noise control. However, it has been found that the measurement system noise always corrupts the actual noise from the sound source. In this study, a new sound level measurement technique in which the system noise is eliminated from the measured signal by the cross spectrum method, is proposed. The received signals of two measuring microphones are recorded to DAT through the pre-amplifier and digitized by A/D converter. The cross spectrum calculated from the digitized signals gives the accurate sound level since the system noise is uncorrelated with the sound source noise which we want to measure. The performance of the proposed technique is verified experimentally to be effective and the technique is found to be economic since the low cost general purpose microphone could be used in this technique.

• Proceedings of the Korean Institute of Interior Design Conference
• /
• 2007.05a
• /
• pp.77-78
• /
• 2007

This project has been designed for people to experience and understand the process, importance and benefit of coal fire plants. As the biggest and first typical Korean fire plant using coal, Boryeong fire plant has had important roll for the Korean industries. Even so, people has had wrong prejudice for the fire plant in terms of environmental protection. To do these kind of rolls, this museum has been designed with theme, "Boryeong fire plant mating symbiotic relationship between nature, human and technologies." The space was zoned with five major themes: i. circulation of energy in nature, ii. electric power and eco-fire plant, iii. future energy, iv roll for future of environment, v. Korea as the leading energy industry. The design has been developed focused on spatial experiences to make 'Design Sequence' with linear circulations haying several important destinations. The interior has been finished with minimal color and materials projected by big sized movie and various LED movie system. Concept of appordance has been used to make interactive experiences between exhibits and visitors.