• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1996년도 한국자동제어학술회의논문집(국내학술편); 포항공과대학교, 포항; 24-26 Oct. 1996
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• pp.956-959
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• 1996

In this study, we propose a neuro-genetic controller combined with a linear controller in parallel to improve the tracking performance of the Line of Sight(LOS) stabilization system and reject the effect of disturbances. A Genetic Algorithm(GA) is used to optimize weights of the neuro-genetic controller since this algorithm can search a global minimum without derivatives or other auxiliary knowledge. The LOS system is very complex and has limited measurable output data. Under these specific circumstances GA solves many problems that other training methods have. Computer simulation results show that the, proposed controller makes better tracking response and rejection of disturbance than a linear controller.

• International Journal of Advanced Culture Technology
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• 제6권3호
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• pp.142-150
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• 2018

This paper describes the algorithm that lowers the dimension, maintains the object recognition and significantly reduces the eigenspace configuration time by combining the edge orientation histogram and principle component analysis. By using the detected object region as a recognition input image, in this paper the object recognition method combined with principle component analysis and the multi-layer network which is one of the intelligent classification was suggested and its performance was evaluated. As a pre-processing algorithm of input object image, this method computes the eigenspace through principle component analysis and expresses the training images with it as a fundamental vector. Each image takes the set of weights for the fundamental vector as a feature vector and it reduces the dimension of image at the same time, and then the object recognition is performed by inputting the multi-layer neural network.

• 대한조선학회지
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• 제20권2호
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• pp.21-26
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• 1983

In this light of economical engineering, the optimal configurations of ship structure that can save weights, production costs and operation costs should be investigated. This paper presents the general method of optimization based on non-linear programming and its application to weight and/or cost minimization of ship structure. Oil tanker is chosen as a ship type because of simple layout and easy calculation of stress. With the data of 16,200 DWT oil tanker built by KSEC 1980, this paper shows the procedure mentioned above by means of SUMT combined with two selected search methods. Then the differences between original and redesigned tanker structures are discussed.

• ETRI Journal
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• 제37권5호
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• pp.906-916
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• 2015

High-speed I/O channels require adaptive techniques to optimize the settings for filter tap weights at decision feedback equalization (DFE) read channels to compensate for channel inter-symbol interference (ISI) and crosstalk from multiple adjacent channels. Both ISI and crosstalk tend to vary with channel length, process, and temperature variations. Individually optimizing parameters such as those just mentioned leads to suboptimal solutions. We propose a joint optimization technique for crosstalk cancellation (XTC) at DFE to compensate for both ISI and XTC in high-speed I/O channels. The technique is used to compensate for between 15.7 dB and 19.7 dB of channel loss combined with a variety of crosstalk strengths from $60mV_{p-p}$ to $180mV_{p-p}$ adaptively, where the transmit non-return-to-zero signal amplitude is a constant $500mV_{p-p}$.

• Journal of Information Processing Systems
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• 제16권1호
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• pp.184-200
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• 2020

Similarity searching is a basic issue in information processing because of the large size of formal contexts and their complicated derivation operators. Recently, some researchers have focused on knowledge reduction methods by using granular computing. In this process, suitable information granules are vital to characterizing the quantities of attributes and objects. To address this problem, a novel approach to obtain an entropy-weighted concept lattice with inclusion degree and similarity distance (ECLisd) has been proposed. The approach aims to compute the combined weights by merging the inclusion degree and entropy degree between two concepts. In addition, another method is utilized to measure the hierarchical distance by considering the different degrees of importance of each attribute. Finally, the rationality of the ECLisd is validated via a comparative analysis.

• 소음진동
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• 제10권1호
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• pp.97-106
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• 2000

The dynamic behavior of crankshaft-bearing system in scroll compressor has been investigated using the combined methodologies of finite elements and transfer matrices. The finite element formulation is proposed including the field element for a shaft section and the point element at balancer weight locations, bearing locations, etc., whereas the conventional method is used with the elements. The Houbolt method is used to consider the time march for the integration of the system equations. The linear stiffness and damping coefficients are calculated for a finite cylindrical fluid-film bearing by solving the Reynolds equation, using finite difference method. The orbital response of crankshaft supported on the linear bearing model is obtained, considering balancer weights of motor rotor. And, the steady state displacement of crankshaft are compared with a variation in balancer weight. The loci of crankshaft at bearing locations are composed of the synchronous whirl component and the non-synchronous whirl component.

• Journal of the Korean Wood Science and Technology
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• 제30권3호
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• pp.66-74
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• 2002

The effects of phenol during ethylene carbonate (EC) liquefaction of pine bark in the presence of methanesulfonic acid (MSA) as a catalyst were investigated. Liquefaction of pine bark using EC in the presence of acid catalyst was very difficult in comparison to wood. Mixing ethylene glycol (EG) with EC improved the liquefaction process, but the maximum liquefaction yield did not exceed 78%. Mixing 20~30% phenol with EC was very effective for the liquefaction and the residue was remarkably decreased. More than 95% of liquefaction was achieved when about 30% phenol was mixed with EC. The reaction conditions, such as catalyst concentration, liquefaction temperature and time, type of catalyst and liquefying agent, had a great influence on the liquefaction process. The results of the average molecular weights and the amount of combined phenols for the liquefied products indicated that sulfuric acid (SA) causes high condensation reactions compared to MSA.

• Journal of Korean Neurosurgical Society
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• 제66권3호
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• pp.289-297
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• 2023

Technological advances in neonatology led to the improvement of the survival rate in preterm babies with very low birth weights. However, intraventricular hemorrhage (IVH) has been one of the major complications of prematurity. IVH is relevant to neurodevelopmental disorders, such as cerebral palsy, language and cognitive impairments, and neurosensory and psychiatric problems, especially when combined with brain parenchymal injuries. Additionally, severe IVH requiring shunt insertion is associated with a higher risk of adverse neurodevelopmental outcomes. Multidisciplinary and longitudinal rehabilitation should be provided for these children based on the patients' life cycles. During the infantile period, it is essential to detect high-risk infants based on neuromotor examinations and provide early intervention as soon as possible. As babies grow up, close monitoring of language and cognitive development is needed. Moreover, providing continuous rehabilitation with task-specific and intensive repetitive training could improve functional outcomes in children with mild-to-moderate disabilities. After school age, maintaining the level of physical activity and managing complications are also needed.

• 한국가금학회지
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• 제12권2호
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• pp.53-57
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• 1985

본 연구는 서울대학교 농과대학 실험목장에서 사육되었던. Broiler 종계 3계통에 대하여 이면교잡을 실시하고 여기에서 작출된 9개 교배조합의 자료를 이용하였다. 총 32수의 부가계와 209수의 모가계에서 생산된 1,109수의 암ㆍ수탉을 공시하여 얻어진 결과는 다음과 같다. 1. 교배조합, 집구, 성별에 대한 분산분석은 모두 고도의 유의성 (P〈0.01)이 인정되었다. 2. 부모 결합분산성분에 의한 유전력은 2, 4, 6 및 8주령 체중에서 각각 0.32, 0.31, 0.35 및 0.29로 추정되었다. 3. 2, 4, 6 및 8주령의 체중에 대한 상관분석에서 2주령과 8주령에서는 0.72의 유전상관과 0.35의 낮은 표현형-상관을 보였으며, 4주령과 8주령에서는 0.91 및 0.61의 유전상관과 표현형상관을 보였다. 또한 6주령과 8주영에서 0.94의 높은 유전상관 및 0.78의 표현형상관이 추정된 결과 broiler종계 교잡시험에 있어서 4주령 및 6주령 체중을 이용하여 8주영 체중에 대한 조기판정의 가능성을 보였다. 4. 2주령부터 8주령까지 broiler 성장을 다항회귀에 적합시킨 결과 전체평균에 의한 것이 W=-141.13＋30.575 D＋G.161D$^2$ (단 14$\leq$D$\leq$56), 암컷은 W=-228.42＋29.886D＋0.126 D$^2$(단, 14$\leq$D$\leq$56), 수컷은 W=-257.14＋3l.474 D＋0.202ㅇ$^2$(단, 14$\leq$D$\leq$56)으로 추정되었다 (W: body weight, D: days of age). 이들 모두 $R^2$가 0.99이상 고도의 적합도를 보였으며, 2적령시 8.36g의 암수 체중차리에서 적령이 경통함에 따라 68.08g(4주령), 169.99g(6주령), 293.19g(8주령)의 성에 의한 차이가 크게 나타났다. 따라서 암수 혼합사육시에는 성에 대한 효과가 적은 계통의 조합으로 선발이 고려되어야 하며, 또한 출하시 체중에 따라 분리사육하는 것이 바람직하다.

• 원예과학기술지
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• 제30권6호
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• pp.657-663
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• 2012

국내에서 육성된 '설향' 딸기에서 칼슘결핍 증상이 빈번하게 발생하고 육묘 시 모주의 생육 저하, 자묘 채취량 감소 및 자묘 품질저하의 원인이 되어왔다. 따라서 단일 비료를 조합하여 K, Ca 및 Mg이 4:2:1의 비율이 되도록 조절한 비료 또는 상업용으로 시판되는 Azuro-Calma를 0.6dS ${\cdot}m^{-1}$ 또는 1.0dS ${\cdot}m^{-1}$로 조절하여 토양에 관주처리할 경우 모주 생육 및 자묘 발생에 미치는 영향을 구명하기 위하여 본 연구를 수행하였다. 정식 후 120일 동안 무처리구에 비해 모든 칼슘 비료 시비구에서 칼슘 결핍증상이 발현된 모주 수가 뚜렷하게 감소하였으며 본 연구의 조합비료보다 Azuro-Calma의 효과가 우수하였다. 무처리구에 비해 모든 칼슘 비료 시비구에서 모주의 생체중과 건물중이 무거웠다. 또한 두 종류 비료 모두 0.6dS ${\cdot}m^{-1}$ 처리보다 1.0dS ${\cdot}m^{-1}$로 시비 농도를 높일 경우 지상부 생장량이 많았고, 본 연구의 혼합 비료가 Azuro-Calma보다 지상부 생체중과 건물중 증가에 더 효과적이었다. 혼합비료 1.0dS ${\cdot}m^{-1}$ 처리에서 가장 긴 런너 길이를 보였고, Azuro-Calma 0.6dS ${\cdot}m^{-1}$ 처리는 무처리구와 비슷한 경향을 보였다. 런너의 생체중과 건물중 역시 혼합비료 1.0dS ${\cdot}m^{-1}$ 처리에서 가장 무거웠으며 Azuro-Calma 1.0dS ${\cdot}m^{-1}$ 처리에서도 생육이 우수하였다. 무처리구보다 칼슘 시비구에서 자묘의 생체중이 더 무거웠지만 칼슘을 시비한 처리중에는 Azuro-Calma 0.6dS ${\cdot}m^{-1}$ 처리가 가장 가벼웠다. 이상과 같은 결과는 Ca와 Mg이 주요 구성 성분인 Azuro-Calma가 칼슘 결핍 증상을 감소시키기에는 더 효과적이지만 K:Ca:Mg의 비율을 조절하여 세 종류 비료를 동시에 시비하는 것이 칼슘 결핍증상 억제와 모주 및 자묘의 생장량 증가에 효과적이라고 판단한다.