• Composites Research
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• v.16 no.4
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• pp.74-79
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• 2003

Comparison of interfacial properties and microfailure mechanisms of oxygen-plasma treated poly(p-phenylene-2,6-benzobisoxazole(PBO. Zylon) and poly(p-phenylene terephthalamide)(PPTA, Kevlar) fibers/ epoxy composites were investigated using micromechanical technique and nondestructive acoustic emission(AE). Interfacial shear strength(IFSS) and work of adhesion, Wa of PBO or Kevlar fibers/epoxy composites increased by oxygen-plasma treatment. Plasma-treated Kevlar fiber shooed the maximum critical surface tension and polar term, whereas the untreated PBO fiber showed the minimum value. Microfibril fracture pattern of plasma-treated Kevlar fiber appeared obviously. Based on the propagation of microfibril failure toward core region. the number of AE events for plasma-treated PBO and Kevlar fibers increased significantly. The results oi nondestructive AE were consistent well with microfailure modes by optical observation in microdroplet and two-fiber composites tests.

• Conservation Science in Museum
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• v.28
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• pp.1-16
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• 2022

Treatment was performed to conserve the Underwood Typewriter (Hangi 6863) from the collection of the National Hangeul Museum. Since the typewriter was presumably manufactured in the modern or contemporary era and bore patterns of damage such as component loss, corrosion, and paint loss, as well as being made of multiple materials, a condition survey and a scientific analysis were conducted ahead of the conservation treatment in order to carry out appropriate treatments for each material. The analysis confirmed that the typewriter was made of various materials including metal, paint, and rubber, and the conservation treatment was performed in the sequence of removal of contamination, reinforcement, and restoration under conditions where each material was stable. Conservation treatment was completed in a stable state by strengthening the layer of damaged paint and restoring the lost leg. These processes have enabled a better understanding of the materials and characteristics of typewriters manufactured in the early modern era, which is expected to provide basic data for typewriter conservation research to be conducted in the future.

• The Bulletin of The Korean Astronomical Society
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• v.35 no.1
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• pp.31.2-31.2
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• 2010

본 연구의 목적은 태양 코로나 구조를 분석하기에 적합한 영상처리 기법을 찾는 것이다. 이를 위하여 우리는 IDL(Interactive Data Language)에 내장된 여러 가지 영상처리방법을 SOHO EIT 영상에 적용하였다. 우리는 영상처리를 위하여 단일 영상처리 방법과 2단계 영상 처리 방법을 사용하였다. 단일 영상처리 방법으로 히스토그램 평활화(Equalization), 주파수 필터링, 경계선 강화기법(Sobel, Robert) 등을 사용하였다. 2단계 영상처리 방법은 단일 영상 처리 방법에서 효과적이었던 방법들을 두 가지 이상 순차적으로 적용하는 것이다. 본 연구를 통하여 우리는 2단계 영상처리 방법(예, 저주파 필터 + Sobel + 히스토그램 평활화)이 단일 영상처리 방법 보다 코로나 루프 구조를 잘 보여주는 것을 확인하였다. 이 연구 결과가 태양 코로나 구조 연구에 유용하게 사용될 수 있을 것으로 기대된다.

• Proceedings of the Korea Water Resources Association Conference
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• 2004.02a
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• pp.113-197
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• 2004

우리나라에서는 수질개선을 위하여 하수처리분야에 1993년부터 1997년까지 총 7조 7,705억원을 투자하였으며, 방류수 수질기준 강화 측면에서는 1996년 1월 1일부터 총인(T-P)과 총질소(T-N)의 방류수 수질기준을 수질환경보전법에 명시하여 규제하기 시작하여, 2008년 1월 1일부터 BOD 및 SS 10mg/L, T-N 20mg/L, T-P 2mg/L로 전국적으로 강화할 계획이다. 그러나, 수질개선을 위한 투자액 중 서울 등 대도시의 하수처리시설이나 하수관거 투자액이 절대적으로 많은 부분을 차지하고 있으므로, 상수원수의 뚜렷한 개선효과는 미미한 실정이다. (중략)

• The Journal of Korean Academy of Sensory Integration
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• v.19 no.3
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• pp.1-12
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• 2021

Objective : The purpose of this study was to investigate the effect of the environmental enrichment therapy (EET) program on the task performance and sensory processing of children with delayed development. Methods : This study was conducted with a single-subject ABA research design for two children with developmental delay findings, and intervention was conducted 7 times a week for 4 weeks. Both children confirmed changes in task performance and sensory processing after intervention. Results : After intervention, task performance improved from an average of 200% to a maximum of 354% compared to the baseline period, and the score in the sensory processing area, which affects tactile processing, emotional response, and activity level, was improved to the normal category. Conclusion : Through this study, it was confirmed that the EET program was effective in performing tasks and sensory processing for children with developmental delays, and its usefulness was confirmed as a program that can be implemented at home.

• Journal of Conservation Science
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• v.25 no.3
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• pp.245-256
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• 2009

Stereo-Microscope observation, ultrasonic velocity, shore hardness and standard color measurement performed for studies of physical characterization of Namsan granite after treated with consolidants. The consolidants used in experiment are 35wt% Silicate Nonparticle/100%1T1G (Nonparticle), 3%POSS-SO1455/97%1T1G(3%POSS1455), POSS-SO1458/97%1T1G (3%POSS1458), 3%7nm/97%1T1G(3%7nm), 3%16nm/97%1T1G(3%16nm), 3% 40nm/97%1T1G(3%40nm) develop with Sejong university, and Wacker Silres BS OH-100, Unil Sandsteinfestiger OH-100. The color of rock surface is darker than original one but similar to original samples with time, and ultrasonic velocity and shore hardness increased with after consolidant treatment.

• Journal of Conservation Science
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• v.31 no.4
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• pp.351-360
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• 2015

This is the result of the study on the temporary fortifier using sublimation type Consolidate is Cyclododecane to prepare plan for reinforcement of the surface part that can be damaged during the dismantling of stone cultural heritages. To supplement the disadvantages of the existing reinforcement methods using intumescent urethane foam, Cyclododecane was diluted in solvent to reinforce the surface and inside desquamation, and after dismantling the framework, it sublimated by imposing heat of about $60^{\circ}C$. Such method can guarantee the strength needed for reinforcement of the damaged surface with outstanding reversibility of Cyclododecane being entirely sublimated. But, it shows big difference of effect according to the solvent, so it shall be diluted in petroleum ether or heated in a double boiler. Therefore, considering the working conditions at the site, it seems the most appropriate to use petroleum ether double boiler heating method for injection and filling of the desquamation part and temporary reinforcement processing with Cyclododecane diluted in petroleum ether for surface spraying.

• Korean Journal of Poultry Science
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• v.34 no.4
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• pp.245-251
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• 2007

This study was conducted to investigate the effects of modification of a herbal recipe(Herb $Mix^{(R)}$) on the growth of pullet and laying performance of hens. The formula of Herb $Mix^{(R)}$, a mixture of Rehmannia glutinosa, Angelica gigas, Discorea japonica, Glycyrrhiza uralensis, Schisandra chinensis and Ligusticum jeholense, was modified in mixing ratio. A total of 1,120 pullets(Hy-Line Brown) of 14 wks old were assigned to seven treatments; control, Herb $Mix^{(R)}$(HM), R. glutinosa fortified HM, A. gigas fortified HM, D. japonica fortified HM, G. uralensis fortified HM, S. chinensis fortified HM, L. jeholense fortified HM and Flavomycin supplemented diet. Each treatment had 8 replicates of 20 birds each housed in 2 birds cages. Body weight at 10% egg production was significantly(P<0.05) influenced by treatments. Birds fed A. gigas fortified HM diet were heaviest followed by L. jeholense fortified HM, HM-original and D. japonica fortified HM, Flavomycin supplemented diet and R. glutinosa while those fed control diet were lightest. Also, age reaching 50% egg production and peak production was earliest in A. gigas fortified HM and latest in the control. Egg production, feed intake, feed conversion and egg weight were significantly influenced by treatments. Significant improvement in egg production and feed intake was shown in A. gigas fortified HM treatment. Feed conversion ratio was lowest in antibiotic(Flavomycin) treatment and egg weight was heaviest in L. jeholense fortified HM treatment. There were no significant differences among treatments in intestinal microflora but cfu of Cl. perfringnes and E. coli tended to be lower in HM treatments than the control. Among the leucocytes of blood, the HM treatments were lower than the control in counts of white blood cell and heterophils. It was concluded that modification of Herb $Mix^{(R)}$ fortifying with A. gigas, D. japonica and L. jeholense significantly influence growth and laying performance of birds.

• KIPS Transactions on Software and Data Engineering
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• v.10 no.7
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• pp.263-270
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• 2021

Reinforcement learning(RL) is the method to find an optimal policy through training. and it is one of popular methods for solving lifesaving and disaster response problems effectively. However, the conventional reinforcement learning method for disaster response utilizes either simple environment such as. grid and graph or a self-developed environment that are hard to verify the practical effectiveness. In this paper, we propose the design of a disaster response RL environment which utilizes the detailed property information of the disaster simulation in order to utilize the reinforcement learning method in the real world. For the RL environment, we design and build the reinforcement learning communication as well as the interface between the RL agent and the disaster simulation. Also, we apply the dimension reduction method for converting non-image feature vectors into image format which is effectively utilized with convolution layer to utilize the high-dimensional and detailed property of the disaster simulation. To verify the effectiveness of our proposed method, we conducted empirical evaluations and it shows that our proposed method outperformed conventional methods in the building fire damage.

• Proceedings of the KSAR Conference
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• 2004.06a
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• pp.265-265
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• 2004

한우번식우 사육농가와 사육규모가 확대와 소 값 상승으로 인하며 인공수정 및 수정란 이식에 대한 수태율 향상에 많은 관심이 집중되고 있다. 이러한 수태율 향상을 위하여 한우 암소에 배란동기화 처리 후 인공수정 시 황체기능 강화제인 등을 투여하여 황체기능을 강화시키고, 투여시기에 따라 개체에 대한 신체충실지수(BCS)와 혈중요소태질소화합물(BUN)을 분석하였으며, 또한 투여시기에 따른 혈중 Progesteroner의 변화를 조사하였다. 황체기능강화제의 투여 방법은 HCG 투여구는 배란동기화 처리 후 6일째와 7일째에 각각 1500 IU와 3000 IU를 투여하였고, 투여 후 14일째에 혈액을 채취하여 혈중 P4 분석하였다. (중략)