• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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• pp.315-318
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• 1995

The optimum design problem of a coat-hanger die is solved by the inverse formulation. The flow in the die is analyzed using three-dimensional model. The new model for the manifold geometry is developed for the inverse formulation. The inverse problem for the optimum die geometry is formed as the optimization problem whose objective function is the linear combination of the square sum of pressure gradient deviation at die exit and the penalty function relating to the measure of non-smoothness of solution. From the several iterative solutions of the optimization problem, the optimum solution can be obtained automatically while producing the uniform flow rate distribution at die exit.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 추계학술대회 논문집(I)
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• pp.690-695
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• 2002

Two plate girders bridge has an advantage for execution of works and quality control because of its simplicity of super-structure caused by decreasing in amount of members and also is distinguished as aesthetic bridge type. Recently this has been adopted for structure of highway as well railway and introduced into domestic. In order to plan or design two plate girders bridge more rationably, it is necessary to comprehend its structural behavior as well as to consider the critical resign factors. Thus, in this study the formulation of optimum design for two plate girders bridge is proposed and the critical resign variables ani restraints are considered and founded by caring out optimum design. The objective function of optimization is formulated as a minimum cost design problem. And the thickness and length of I-shaped section are decided as resign variables. The design constraints are formulated based on Design Criteria for Railroad(Bridges). By comparing the optimum results with those of the conventional resign, the effectiveness of proposed optimum design formulation is investigated. From the results, the way to do optimum design of two plate girders bridge is suggested.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2007년도 춘계학술발표논문집
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• pp.267-269
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• 2007

콘크리트 중의 철근이 염분에 의해 부식되는 것을 억제 또는 예방하고, 각종 부식 환경으로부터 구조물의 수명을 연장할 목적으로 사용되는 방청혼화제의 최적 formulation과 그에 대한 물성 및 성능 시험을 실시하였다. 철근 부식에 대한 방청 메카니즘의 이해와 방청 혼화제의 formulation에 따른 물성시험과 성능평가를 실시하여 최적 조건을 확립하였다. 성능평가는 콘크리트 공시체의 Slump, 공기량, 압축강도(3일, 7일, 28일) 측정과 함께 염수침지시험 동의 방청성능 평가를 실시하였다.

• Journal of Pharmaceutical Investigation
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• 제28권4호
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• pp.267-274
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• 1998

Biphenyl dimethyl dicarboxylate (DDB) has been used for the treatment of acute and chronic hepatitis. However, its poor solubility in water, $2.5\;{\mu}g/ml$, caused low bioavailability of the drug after its oral administration. In order to increase the dissolution of DDB in gastrointestinal tracts, consequently to increase the bioavailability of the drug, DDB tablet was prepared with solid dispersion of DDB with poloxamer 338 or 407 using a direct compression method. To improve the flowability of the solid dispersion, Aerosil was used as an adsorbent. The effect of formulation variables (poloxamer and Aerosil contents) on the dissolution rate of DDB from tablets was investigated using an analysis of variance. The dissolution rate of DDB from tablets was evaluated with KP II (paddle) method. The dissolution patterns of the drug from the tablet prepared with poloxamer 407 were affected significantly by the contents of poloxamers and Aerosil over the range employed, but those of the drug from the tablet prepared with poloxamer 338 were not. The optimum formulation of the DDB tablet, showed the same dissolution pattern as that of the reference, was obtained after polynomial equations of drug dissolution profiles for each formula were fitted to contour plots. The optimum formulation ratios of DDB:poloxamer 407:Aerosil were 1:2.5:2.5 and 1:5:5.

• 한국조리학회지
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• 제23권5호
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• pp.67-76
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• 2017

This study investigated the quality characteristics of melon jam with RSM. The melon jam was prepared with 50~65% sugar, 0.5~2.0% pectin, and 0.1~0.5% citric acid. Sugar and pectin caused the increase in sweetness, Hunter's colorimetric characteristics (a, b), and firmness. Citric acid caused decrease in pH, sweetness, firmness. Sensory evaluation results showed that preferences for the melon jam increased as sugar, pectin, and citric acid approached their optimum values and then decreased as they exceeded optimum levels. Consequently, the proposed optimum levels in the ingredient formulation for manufacture of the standard melon jam were 59.0% sugar, 1.4% pectin, and 14.9% citric acid, as based on both numerical and graphic statistical analyses. Ultimately, this study was expected to contribute to the commercialization of melon jams of high quality.

• 한국수산과학회지
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• 제32권5호
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• pp.556-562
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• 1999

전분은 종류에 관계없이 첨가량을 증가시킴에 따라 gel 강도는 저하하였으며, RA급 냉동 surimi은 전분의 종류에 큰 영향을 받지 않은 반면, A급은 감자전분 및 수식 옥수수전분이 농도 증가에 따른 gel 강도 감소에 가장 적은 영향을 미치는 것으로 나타났다. WPC, DEW 및 SPI는 첨가량이 증가함에 따라 gel 강도는 감소하였으나, BPP는 gel 강도를 증가시키는 것으로 나타났으며, 이 같은 효과는 RA급에서 현저하였다. BPP의 gel 강도 증가 효과는 낮은 변성온도와 열 변성에 따른 구조 변화가 어육 gel의 matrix 강화에 영향을 미치는 것으로 판단된다. RA급을 이용한 어육 gel 제조시 백색도에 큰 영향을 미치지 않는 $2\%$ 범위 내에서 gel 강도 강화를 위해 사용할 수 있는 것으로 나타났다. Gel 강도 1000$\times$g를 제한 인자로 하였을 때, 냉동 surimi의 소모량이 가장 적은 formulation은 A급에서는 A급 surimi $37.8\%$ DEW $6.6\%$, 전분 $3.4\%$ 였으며, RA급에서는 RA급 surimi $40.9\%$, DEW $9.1\%$, 전분 $0.9\%$이었다.

• 공업화학
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• 제16권6호
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• pp.827-833
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• 2005

본 연구에서는 폴리아미드계 수지를 이용하여 최적의 핫멜트 접착제 배합설계를 접착제 합성, 물성평가 및 철에 대한 접착력 평가를 통해 구축하고자 하였다. 최적 배합설계를 위해 앞선 연구결과에 따라 CM831과 843P의 기본 수지에 점착부여수지로 테르펜수지의 무게비를 각각 75/25/10으로 고정한 후 왁스, 충전제 등이 사용되었으며 이들의 종류와 첨가량이 접착제의 흐름 특성과 접착력에 미치는 영향을 조사하였다. 결과에 따르면 왁스의 경우 폴리에틸렌 왁스의 첨가량이 증가함에 따라 용융점도는 다소 감소하였지만 철과의 최적 접착력은 5 wt%에서 나타났다. 이는 접착제 자체의 기계적 물성과 밀접한 관계가 있음을 알 수 있었다. 충전제의 경우는 탈크가 10 wt% 첨가되었을 때 다소 높은 용융점도에 비해 우수한 접착성능을 나타내었다.

• 산업기술연구
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• 제22권A호
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• pp.83-87
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• 2002

Many industrial products such as paints, ink and adhesives are composed of the ingredients of a mixture. In mixture experiments, the characteristics of quality(response) depends only on the proportions of the ingredients and does not depend on the total amount of the mixture. This article discusses the constrained mixture experimental design, the data analysis, and the optimum formulation of ingredients based on the two quality characteristics - taste and flavor. It IS shown that efficient designs can be constructed from D-optimal criterion. Special cubic models were selected as the final mixture response surfaces for both reponses. The desirability function was used for the optimization of the two responses.

• Structural Engineering and Mechanics
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• 제35권5호
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• pp.539-554
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• 2010

Light weight superstructure is beneficial for bridges in remote areas and in emergency erection. In such weight sensitive applications, combination of fibre reinforced plastics (FRP) as material and box-girders as a structural system have great scope. This combination offers various options to tailor structure and its elements but this flexibility poses greater challenge in optimum design. In this paper a procedure is derived for a generalised optimum design of FRP box-girder bridges, using genetic algorithms (GA). The formulation of the optimum design problem in the form of objective function and constraints is presented. Size, configuration and topology optimization are done simultaneously. A few optimum design studies are carried out to check the performance of the developed procedure and to get trends in the optimum design which will be helpful to the new designers.

• Steel and Composite Structures
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• 제9권6호
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• pp.535-555
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• 2009

The harmony search method based optimum design algorithm is presented for geometrically non-linear semi-rigid steel frames. Harmony search method is recently developed metaheuristic algorithm which simulates the process of producing a musical performance. The optimum design algorithm aims at obtaining minimum weight steel frames by selecting from standard set of steel sections such as European wide flange beams (HE sections). Strength constraints of Turkish Building Code for Steel Structures (TS648) specification and displacement constraints were used in the optimum design formulation. The optimum design algorithm takes into account both the geometric non-linearity of the frame members and the semi-rigid behaviour of the beam-to-column connections. The Frye-Morris polynomial model is used to calculate the moment-rotation relation of beam-to-column connections. The robustness of harmony search algorithm, in comparison with genetic algorithms, is verified with two benchmark examples. The comparisons revealed that the harmony search algorithm yielded not only minimum weight steel frames but also required less computational effort for the presented examples.