• Journal of the Korean Statistical Society
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• 제4권2호
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• pp.139-151
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• 1975

Individual effect of genes controlling quantitative traits can not ordinarily be distinguised from one another. Consequently, it is not possible to determine the mode of inheritance for single genes. By studying their combined effectsin segregating generations, however, one can gain some insight into their behavior and can make statistical inferences about their average gene action. The investigation reported herein was to extend genetic variance components and variance and covariance analyses, special attention was given to the genetic statistics from which least square estimators of genetic parameters are obtained.

• 한국지능시스템학회:학술대회논문집
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• 한국퍼지및지능시스템학회 2003년도 ISIS 2003
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• pp.358-363
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• 2003

Optimal tuning plays an important role in operations or tuning of the complex process such as the main steam temperature of the thermal power plant. However, it is very difficult to maintain the steam temperature of power plant using conventional optimization methods, since these processes have the time delay and the change of the dynamic characteristics in the reheater. Up to the present time, the Pm controller has been used. However, it is not easy to achieve an optimal PID gain with no experience, since the gain of the PID controller has to be manually tuned by trial and error. This paper suggests immune algorithm based tuning technique for PID Controller on steam temperature process with long dead time and its results are compared with genetic algorithm based tuning technique.

• Design & Manufacturing
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• 제16권1호
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• pp.15-20
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• 2022

This paper is about elimination the situation in which gas sensor data becomes inaccurate due to temperature control when a semiconductor gas sensor is driven. Recently, interest in semiconductor gas sensors is high because semiconductor sensors can be driven with small and low power. Although semiconductor-type gas sensors have various advantages, there is a problem that they must operate at high temperatures. First temperature control was configured to adjust the temperature value of the heater mounted on the gas sensor. At that time, in controlling the heater temperature, gas sensor data are fluctuated despite supplying same gas concentration according to the temperature controlled. To resolve this problem, gas and temperature are extracted as a data. And then, a relation function is constructed between gas and temperature data. At this time, it is included low pass filter to get the stable data. In this paper, we can find optimal gain and parameters between gas and temperature data by using genetic algorithm.

• 한국초지조사료학회지
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• 제37권4호
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• pp.345-349
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• 2017

본 연구는 엘크 사슴의 사육방식에 따른 사료섭취량, 체중 변화 및 녹용생산성에 미치는 영향을 확인하기 위하여 실시하였다. 엘크 사슴 12두를 공시하여 사사사육과 방목사육 형태로 사육하였으며, 처리구 간에 섭취량은 유사하게 나타났다. 일당증체량과 녹용생산성의 경우 방목사육 형태가 높게 나타났는데, 일당증체량은 방목사육 시 약 39% 높은 경향을 보였는데 이는 발육 개선효과가 있을 것으로 생각된다. 녹용 생산성 역시 방목사육 시에 약 19% 높은 경향을 보였다. 그러나 녹용 생산성의 경우 개체 간 편차가 심하여 통계적 유의성은 인정되지 않았다. 본 시험에서 방목사육 시에 일당증체량과 녹용 생산성이 높게 나타난 것은 방목에 따른 조사료원의 영양적 성분이 높기 때문으로 생각된다. 이러한 결과는 사슴 방목의 효과에 대한 기초자료로서 충분이 활용될 수 있을 것이며, 앞으로 계절과 방목지의 초종에 따른 녹용의 생산성과 안정성에 대한 추가적인 연구가 수행되어야 할 것으로 생각된다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2000년도 춘계학술대회논문집 - 한국공작기계학회
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• pp.629-634
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• 2000

Generally, the accuracy of motion control systems is strongly influenced by both the mechanical characteristics and servo characteristics of feed drive systems. In the fed drive systems of machine tools that consist of mechanical parts and electrical parts, a torsional vibration is often generated because of its elastic elements in torque transmission. Especially, a torsional vibration caused by the elasticity of mechanical elements might deteriorate the quick movement of system and lead to shorten the life time of the mechanical transmission elements. So it is necessary to analyze the electromechanical system mathematically to optimize the dynamic characteristics of the feed drive system. In this paper, based on the simplifies feed drive system model, radius errors due to position gain mismatch and servo response characteristic have been developed and an optimal criterion for tuning the gain of speed controller is discussed. The proportional and integral parameter gain of the feed drive controller are optimal design variables for the gain tuning of PI speed controller. Through the optimization problem formulation, both proportional and integral parameter are optimally tuned so as to compensate the radius errors by using the genetic algorithm. As a result, higher performance on circular profile tests has been achieved than the one with standard parameters.

• 한국정보전자통신기술학회논문지
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• 제14권6호
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• pp.473-478
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• 2021

본 논문은 급증하는 무선통신, 자율주행자동차, 5G 무선통신 및 광대역 어플리케이션 등과 같이 다양한 방면에서 필요로 하는 광대역, 고이득 안테나 필요성에 따라 후면 주파수 선택 표면(FSS, Frequency Selective Surface)을 이용한 광대역 고이득 평면 사다리꼴 모노폴 안테나를 설계하였다. 제안된 안테나는 이중 금속층을 사용하여 기존의 주파수 선택 표면과 구조적인 차이점을 갖는다. 또한 기존의 안테나 설계에서 갖는 설계의 복잡함을 해결하기 위해 GA(Genetic Algorithms)과 HFSS(High Frequency Structure Simulator) 시뮬레이션을 사용하여 효율성을 증가시켰다. 이를 통해 3.52 GHz ~ 5.92 GHz의 넓은 대역폭과 전체 대역폭에서 10.5 dBi 이상의 이득을 유지하며, 5.1 GHz에서 11.8 dBi의 최고 이득을 갖는다. 기존 안테나와 비교하였을 경우 1.8 GHz의 36% 임피던스 대역폭이 2.4 GHz의 50% 임피던스 대역폭으로 향상되었으며, 이득의 경우 8.6 dBi 증가하는 것을 확인하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제24권11호
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• pp.1504-1513
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• 2011

It is important to identify genetic interactions related to human diseases or animal traits. Many linear statistical models have been reported but they did not consider genetic interactions. Genotype matrix mapping (GMM) has been developed to identify genetic interactions. This study uses the GMM method to detect superior SNP combinations of the CCDC158 gene that influences average daily gain, marbling score, cold carcass weight and longissimus muscle dorsi area traits in Hanwoo. We evaluated the statistical significance of the major SNP combinations selected by implementing the permutation test of the F-measure. The effect of g.34425+102 A>T (AA), g.8778G>A (GG) and g.4102+36T>G (GT) SNP combinations produced higher performance of average daily gain, marbling score, cold carcass weight and the longissimus muscle dorsi area traits than the effect of a single SNP. GMM is a fast and reliable method for multiple SNP analysis with potential application in marker-assisted selection. GMM may prospectively be used for genetic assessment of quantitative traits after further development.

• Journal of Animal Science and Technology
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• 제57권11호
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• pp.39.1-39.5
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• 2015

The effects of castration time on growth and carcass traits of elk bulls were investigated. Twelve bulls at 5 years old were raised and fed on concentrate with ad libitum hay. All animals were allocated randomly to each of four treatment groups (3 heads/group). Groups of each treatment were castrated surgically in March, April or June and managed together with non-castration (entire) treatment. All elk bulls in the trial were slaughtered at same time. Growth parameters, carcass yield and composition were recorded. The total gain and average daily gain was higher when castrated in April (p < 0.05). The entire elk produced heaviest and highest in saddle and brisket portions (p < 0.05). It is apparent that the castrate animals carried more total fat weight and percentages than the entire males (p < 0.05). It was found that loin muscles from non-castrated elk, in comparison with those from castrated one, had higher content of moisture and lower content of fat (p < 0.05). In this study, growth parameters, carcass yields and chemical composition were greatly affected by castration time.

• 한국소음진동공학회논문집
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• 제25권5호
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• pp.361-368
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• 2015

This paper deals with a robust fine seek controller design problem with multiple constraints using a genetic algorithm. A robust $H\infty$ constraint is introduced to attenuate effectively velocity disturbance caused by the eccentric rotation of the disk. A weighting function is optimally selected based on the estimation of velocity disturbance and the estimated minimum velocity loop gain. A robust velocity loop constraint is considered to minimize the variances of the velocity loop gain and bandwidth against the uncertainties of fine actuator. Finally, a robust fine seek controller is obtained by solving a genetic algorithm with an LMI condition and an appropriate objective function. The proposed controller design method is applied to the fine seek control system of a DVD recording device and is evaluated through the experimental results.

• 한국작물학회지
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• 제21권1호
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• pp.92-96
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• 1976

본 실험은 대두육종을 위한 유전자원으로서 우리나라 재래종 825계통을 대상으로 2년간 재배하면서 그 집단내의 유전적 변이성과 특성을 구명하고 이들을 이용한 다수확 품종의 육성에 필요한 정보를 획득하는데 목적이 있으며 그 결과는 다음과 같다. 1. 단위면적당 평균 수량은 1,004.1kg/ha이고 대부분의 계통이 795kg에서 1,245kg의 수량성을 보였으며 백립중은 8.6gr∼44.4gr의 범위에서 평균 23.0gr이였다. 성숙기는 평균 144.7일로써 대부분의 계통이 만숙성이였고 초장 및 주당협수의 변이폭은 비교적 컸다. 2. 단백질함량은 평균 42.83%이고 40.7%∼44.2%, 지방함량은 평균 17.46%로서 전체계통의 70%가 16.5%∼19.0% 범위에 속해 있어 저지방성임을 나타내었다. 3. 유전분산은 수량과 초장 및 주당협수가 컸고 백립중 및 성숙기도 비교적 컸으나 단백질과 지방함량은 적은 유전분산을 보였다. 4. 백립중, 초장 및 주당협수의 유전력과 선발에 대한 기대치는 비교적 높았으며 성숙기의 유전력은 높았으나 선발효율은 낮았는데 그 원인은 재래종 집단의 표현형분산이 적은데 있다고 할 수 있다.