• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.2
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• pp.683-688
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• 2018

In this study, we analyzed the heat generation state of a flat heating element by using image processing technology in conjunction with carbon fiber. The flat heating element is manufactured by chopping the carbon fiber to a small size and bonding it again using a dispersing agent. The solution of carbon fiber, bound together using the dispersant, is then filtered onto the nonwoven fabric. The last step is to obtain flat carbon fibers in the form of nonwoven fabrics for the purpose of drying the filtered carbon fibers. In the flat heating element, electricity may be applied to the carbon fiber on the surface produced in this manner. In this study, the flat heating element was analyzed by four methods. The analysis of the heat generation characteristics and heating rate of the flat heating element confirmed that the fabricated sheet heating element corresponds to a normal army. The analysis of the insulation coating and flat heating element module, which can be used for actual product manufacturing, involves two dimensional image analysis using image processing technology. The thermal image analysis of the flat heating element is a programming technique that not only analyzes the heat generation state in both two and three dimensions, but also displays the upper and lower 15 to 20% ranges of temperature corresponding to the heat generation in the image. In the final analysis, it is possible to easily find the erroneous part in the manufacturing process by directly showing the state of the fabricated flat heating element on the screen. By combining this image analysis method of the flat heating element with the existing method, we were able to more accurately analyze the heat generation state.

• Korean Journal of Cognitive Science
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• v.16 no.4
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• pp.369-386
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• 2005

Although Intelligent Tutoring System(ITS) offers individualized learning environment that overcome limited function of existent CAI, and consider many learners' variable, there is little development to be using at the sites of schools because of inefficiency of investment and absence of pedagogical content knowledge representation techniques. To solve these problem, we should study a method, which represents knowledge for ITS, and which reuses knowledge base. On the pedagogical content knowledge, the knowledge in education differs from knowledge in a general sense. In this paper, we shall primarily address the multi-complex structure of knowledge and explanation of learning vein using multi-complex structure. Multi-Complex, which is organized into nodes, clusters and uses by knowledge base. In addition, it grows a adaptive knowledge base by self-learning. Therefore, in this paper, we propose the 'Extended Neural Logic Network(X-Neuronet)', which is based on Neural Logic Network with logical inference and topological inflexibility in cognition structure, and includes pedagogical content knowledge and object-oriented conception, verify validity. X-Neuronet defines that a knowledge is directive combination with inertia and weights, and offers basic conceptions for expression, logic operator for operation and processing, node value and connection weight, propagation rule, learning algorithm.

• Applied Chemistry for Engineering
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• v.29 no.2
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• pp.201-208
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• 2018

The ortho- and iso- type unsaturated polyester resins were synthesized and used as a polymer binder of the polymer mortar composite. Styrene monomer and acrylonitrile were used as a diluent for the unsaturated polyester resin. Methyl ethyl ketone peroxide (MEKPO) and cobalt octoate (CoOc) were used as a curing agent and an accelerator, respectively. Four kinds of unsaturated polyester resins were prepared according to types of the resin and diluent, and used as a polymer binder in the preparation of the specimen. A total of 16 polymer mortar specimens were prepared according to the added amount of the polymer binder and subjected to a hot water resistance test, followed by compressive and flexural strength tests, and pore and SEM analyses. As a result, it was found that the strength of the specimen using the iso-type unsaturated polyester resin as the polymer binder was better than that of using the ortho-type unsaturated polyester resin. The total pore volume and diameter measured after the hot water resistance test were reduced compared to the values before the test. In the micrographs observed before the hot water resistance test, the polymer binder, filler and fine aggregate were firmly combined to the co-matrix, but the polymer binder was mostly decomposed in the micrographs observed after the test.

• Reproductive and Developmental Biology
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• v.31 no.1
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• pp.15-20
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• 2007

To search of a new porcine pheromonal odorant for biostimulation control system technologies to offer a potentially useful and practical way to improve reproductive efficiency in livestock species, the two dimensional quantitative structure-activity relationship (QSAR) models between physicochemical parameters as descriptors of 2-cyclohexyloxytetrahydrofurane (A), 2-phenoxytetrahydrofurane (B) analogues and binding affinity constant ($p[Od.]_{50}$) for porcine odorant-binding protein (pOBP) as receptor of pig pheromones were derived and disscused. The statistical quality of the optimized 2D-QSAR model is good ($r^{2}=0.964$) and accounts for 96.4% of the variance in the binding affinity constants. It was found that the binding affinity constants were dependent upon the optimal value, $(SL)_{opt.}=1.418$ of substituent lipole (SL) in molecules. Therefore, the SL constant was very important factor for binding affinity.

• Journal of Life Science
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• v.21 no.5
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• pp.706-712
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• 2011

Metabolism of $^3H$-castasterone in the presence of $^{32}P$-ATP was examined by an enzyme solution prepared from A. thaliana after a reversed phased HPLC, after which a polar metabolite labeled by both $^3H$ and $^{32}P$ was obtained, suggesting that $^3H$-CS is phosphorylated by $^{32}P$-ATP. To elucidate the structure of the phosphorylated CS, the same enzyme assay was carried out with non-isotopes labeled CS and ATP. In GC-MS analysis the metabolite gave a molecular ion at m/z 664 as a bismethanboronate, suggesting the metabolite is a CS phosphate. Treatment of wheat germ acid phosphatase that hydrolyzed phosphoester bond gave the same mass spectrum and GC retention time in GC-MS analyses, confirming that the metabolite is phosphorylated CS. This is the first example of phosphorylated conjugates of CS in plants.

• Korean Journal of Cognitive Science
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• v.3 no.1
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• pp.25-39
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• 1991

When an ending which begins with 'a/a'combines to a stem,'a/a'can be deleted.Especially when ot combines to an h-irregular verb,it is represented as a variant like '-a-','-e-','-ia-',or'-ie-'.In order to analyze the variants of 'a/a',we suggest the format of a grammatical morpheme dictionary which is represented as a binary tree and several procedures which process the variants so that the unexpected errors can be removed which occur frequently when we analyze Korean worl phrase.

• Korean Journal of Medicinal Crop Science
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• v.13 no.4
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• pp.178-181
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• 2005

Methanolic extracts of fifteen Chinese medicinal plants were screened for platelet-activating factor (PAF) receptor binding inhibitory activity using rabbit platelet. Campsis grandiflora, Dalbergia odorifera, Vaccaria segetalis and Zanthoxylum nitidum showed significant inhibitory effects on the platelet-activating factor (PAF) receptor binding. Campsis grandiflora, Dalbergia odorifera, Vaccaria segetalis and Zanthoxylum nitidum inhibited 52%, 56%, 70%, and 66% respectively at the concentration of 0.2 mg/ml.

• Journal of Sensor Science and Technology
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• v.7 no.1
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• pp.9-16
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• 1998

This paper describes how the directivity pattern of the scattered sound pressure is distributed when a plane acoustic wave is incident on a rigid or soft spherical shell underwater. A coupled Finite Element-Boundary Element method is developed as a numerical technique. The result of the coupled FE-BE method is agreed with theoretical solution for algorithmic confirmation.

• Proceedings of the Korean Aquaculture Society Conference
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• 2003.10a
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• pp.25-25
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• 2003

어류의 번식활동은 뇌-뇌하수체-생식소로 이어지는 내분비기관이 주로 담당하고 있으며, 그 중에서 뇌하수체에서 만들어지는 생식선자극호르몬 (GTH)은 생식소 발달에 매우 중요한 역할을 한다. 한편, GTH는 생식소에서 생성되는 스테로이드호르몬에 의해 유전자의 발현이 조절된다. 본 연구에서는 산천어 (Oncorhynchus masou)의 GTH 유전자발현에 미치는 estradiol-17$\beta$ (E2)의 영향을 생체내에서 먼저 조사하고, 유전자발현조절의 메카니즘을 구명하기 위하여 에스트로젠 수용체 (ER)의 cDNA를 cloning하였다. 또한 내분비교란물질로 알려져 있으며 에스트로젠 수용체와의 유사결합작용이 알려진 노닐페놀 (NP)의 영향도 아울러 조사하였다. 미성숙 산천어를 E2 및 NP (각각 5 mg/kg 및 10 mg/kg 체중)로 처리하면 72 시간째에 뇌하수체내의 $\beta$-actin mRNA에 비해 GTH (FSH$\beta$, LH$\beta$) mRNA가 상대적으로 증가하는 경향을 나타내었다. 뇌하수체에서 분리한 ER의 기본적인 구조는 DNA결합도메인 (Zf-C4), 호르몬결합도메인 (hormone_rec), 기타 전사활성화도메인으로 구성되어 있었으며 (그림 1), 기존에 보고된 에스트로젠 수용체중에서 무지개송어 및 대서양연어의 ER과 각각 98%, 96%의 높은 상동성이 관찰되었다. 향후, 준비된 ER을 재료로 하여 GTH 유전자발현의 호르몬의존성을 조사할 예정이다.

• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.218-218
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• 2016

실린더 형태의 유전체 관에 나선형으로 도전체 안테나를 설치하는 타입의 유도 결합 플라즈마원은 간단한 구조로 화학 조성 분석용부터 나노 분말 제조, 반도체용 식각/증착, 표면 처리, 자동차 및 일반 산업 부품용 증착 보조원등으로 널리 사용되고 있다. 고밀도 라디칼/이온의 공급을 위해서 투입 전력을 증가시키는 경우 높은 전력 밀도로 인해서 유전체 관에 인가되는 열응력이 대기압 및 관 고정용 구조물에 의한 구조 응력에 더해져서 파손에 이르는 경우가 발생될 수 있다. 실제 실린더 길이 전체를 안테나 코일로 감는 경우에도 플라즈마 발생 밀도가 높은 지역은 중심 일부 영역에 국한 되는 공정 영역도 있어서 이에 대한 분석이 필요하다. CFD-ACE+를 이용하여 플라즈마의 생성, 냉각수의 열전도, 외부 공냉식 팬의 역할등에 대해서 수치 모델을 작성하여 검토하였다. 나선형 냉각코일의 경우 냉각수량을 일정값 이상으로 증가시키는 경우 유속이 지나치게 빨라져서 열원이 있는 내경쪽 표면에서 열전도가 유속에 비례해서 증가하지 못하는 단점이 발생할 수 있으며 냉각팬의 경우 일반적으로 장치 내부에 대해서만 모델링을 하는 데 실제로 전체 시스템의 주변에서 공기의 흐름을 넓게 해석해야 실제 냉각 효과를 파악할 수 있다. 심한 경우 냉각용 공기 흡입구와 토출구의 간격이 좁아서 열원에 의해서 가열된 공기의 상당량이 다시 냉각용 공기 흡입구로 재순환 되는 경우도 발생하기 쉽다.