• Preventive Nutrition and Food Science
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• 제11권1호
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• pp.78-83
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• 2006

A simplex-lattice mixture design was applied to blend three varieties of rice; Ilpum (IP), Goami2 (G2) and Baegjinju (BJJ) all of which have very different physicochemical properties from one another. G2 and BJJ are mutant rice developed from IP. Increasing G2 portions in a rice blend increases indigestible carbohydrate contents. Blending at least 33.3% of G2 to either IP or BJJ increased indigestible carbohydrates, which were approximately $3.55{\pm}1.31\;to\;4.57{\pm}0.37$(g/100 g), respectively. Consumers rated higher than 6.0 (=like slightly) for the IP alone and binary blends of IP and BJJ, whereas less than 5.0 (=dislike moderately) for the blends containing G2 rice, indicating that consumers would not accept rice blends containing higher G2 portions. However, although blends with G2 were given lower consumer ratings, a rice blend with G2 could have health benefits in terms of nutritional and functional properties due to the higher indigestible carbohydrate contents.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계 학술발표회 논문집(II)
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• pp.405-408
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• 2006

The purpose of this study was to determine the optimum length distribution of hybrid PVA(Poly vinyl alcohol) fiber. To produce blended PVA fiber length, first the length distribution of PVA fiber in the cement composites were identified in an experimental study based on simplex lattice design. Among the different length distributions investigated, fiber length was found to have statistically significant effect on plastic shrinkage cracking of cement composites. Subsequently, Complex analysis techniques were used to devise an experimental program that helped determine the optimum combinations of the selected fiber length distribution based on plastic shrinkage crack. The optimum blended PVA length ratio was 0.0146% 4mm fiber, 0.0060% 6-mm fiber, 0.0285% 8-mm fiber, and 0.0209% 12-mm fiber.

• 한국작물학회지
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• 제51권spc1호
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• pp.292-296
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• 2006

Three rice cultivars of Goami2 (G2), Ilpumbyeo (IP), and Baegjinju (BJJ) of which physicochemical properties are significantly different, were blended by a simplex-lattice mixture design. The effect of blending those rice cultivars on pasting and texture properties were observed. Rapid Visco Analysis (RVA) indicated that the onset gelatinization temperature of pure blend of G2 rice $(83.80{\pm}0.07^{\circ}C)$ was higher than that of IP $(68.08{\pm}0.01^{\circ}C)$ and BJJ $(68.08{\pm}0.04^{\circ}C)$. Increasing G2 rice resulted in lower peak and breakdown viscosity, and adhesiveness and cohesiveness, whereas higher setback viscosity and hardness. Pasting and texture properties of IP and BJJ indicated that G2 rice has quite different physical characteristics compared to IP and BJJ. Thus, it is expected that blending those three rice cultivars can be used to formulate a desirable rice blend on purpose, furthermore to promote the consumption of G2 rice, which has higher indigestible carbohydrate contents.

• 한국환경과학회지
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• 제29권8호
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• pp.793-800
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• 2020

The conventional development of multi-component electrodes is based on the researcher's experience and is based on trial and error. Therefore, there is a need for a scientific method to reduce the time and economic losses thereof and systematize the mixing of electrode components. In this study, we use design of mixture experiments (DOME)- in particular a simplex lattice design with Design Expert^Ⓡ program- to attempt to find an optimum mixing ratio for a three-component electrode for the high RNO degradation; RNO is an indictor of OH radical formation. The experiment included 12 experimental points with 2 center replicates for 3 different independent variables (with the molar ratio of Ru, Ti, Ir). As the Prob > F value of the 'Quadratic' model is 0.0026, the secondary model was found to be suitable. Applying the molar ratio of the electrode components to the corrected response model results is an RNO removal efficiency (%) = 59.89 × [Ru] + 9.78 × [Ti] + 67.03 × [Ir] + 66.38 × [Ru] × [Ir] + 132.86 × [Ti] × [Ir]. The R² value of the equation is 0.9374 after the error term is excluded. The optimized formulation of the ternary electrode for an high RNO degradation was acquired when the molar ratio of Ru 0.100, Ti 0.200, Ir 0.700 (desirability d value, 1).

• 산업식품공학
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• 제15권4호
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• pp.297-304
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• 2011

혼합물실험계획법(mixture experimental design)을 적용하여 라면 밀가루 혼합비를 최적화하였다. 밀가루 혼합비를 최적화하기 위하여 전체 기호도(overall palatability)의 최대화, 반죽 레올로지 특성의 특정 범위 유지를 최적화의 목적으로 설정하였다. 라면은 가장 보편적인 미국산 밀가루 중 강력분인 DNS, 중력분인 HRW, 박력분인 SW를 simplex-lattice 방식에 의해 혼합비를 달리하여 제조하였다. 각 시료는 Rapid Visco Analyser(RVA), 파리노그래프, 익스텐소그래프를 이용하여 반죽의 레올로지 특성치를 측정하였으며, 조리된 라면의 전체 기호도를 관능 검사 하였다. 정준상관분석(canonical correlation analysis)를 통하여 RVA의 최고점도(PV), 파리노그래프의 반죽형성시간(DT), 익스텐소그래프의 R/E 45 min을 주요 반죽 레올로지 특성치로 선발하였다. 최적화 목적으로 전체 기호도의 최대화와 최고점도(PV)(최대화), 반죽형성시간(DT)(최소화) 및 R/E45 min(최대화)를 지정하였다. 그 결과 최적화된 밀가루 혼합비는 DNS 33.3%, HRW 33.3% 및 SW 33.3% 이였으며, 이때 전체 기호도는 5.825, 최고점도(PV)는 587.9 cP, 반죽형성시간(DT)은 3.1 min, R/E 45 min는 2.339 BU/mm로 나타났다.

• 한국환경과학회지
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• 제25권5호
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• pp.737-744
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• 2016

For electrolysis process using an insoluble electrode, electrochemical performance was greatly affected by the manufacturing method and procedure, such as the firing temperature, pre-treatment, type of precursor solution, coating method, electrode material, etc. Components of the electrode therein is one of the most important factors in electrochemical reaction. To achieve such characteristics, a appropriate ratio of the electrode material should be carefully chosen. The aim of this research was to apply experimental design method in the optimization of electrode component for the maximum generation of oxidants in electrochemical oxidation process. Mixture design, especially expanded simplex lattice design, in DOME (design of mixture experiments) with Design Expert - commercial software - was used to analyze the data. Analysis of variance (ANOVA) showed a high coefficient of determination ($R^2$) value of 0.9470, thus ensuring a satisfactory adjustment of the $3^{rd}$ order special cubic regression model with the experimental data. The application of response surface methodology (RSM) yielded the following regression equation, which is an empirical relationship between the TRO generation concentration and independent variables(mol ratio of 3 electrode components) in a real unit: TRO generation concentration $(mg/L)=TRO\;conc.=98.25{\times}[Ir]+49.71{\times}[Sn]+95.29{\times}[Sb]-16.91{\times}[Ir]{\times}[Sn]-29.47{\times}[Ir]{\times}[Sb]-22.65{\times}[Sn]{\times}[Sb]+703.19{\times}[Ir]{\times}[Sn]{\times}[Sb]$. The optimized formulation of the 3 component electrode for an high TRO (total residual oxidants) generation was acquired at mol ratio of Ir 0.406, Sn 0.210, Sb 0.384 (desirability d value, 1).

• 한국기계가공학회지
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• 제21권8호
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• pp.79-86
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• 2022

With the recent increase in the demand for electric vehicles, it is necessary to identify the high current safety of automobile parts. Among the automobile parts, the EPDM parts required colored parts from the existing black; therefore, it was necessary to change the basic filler from carbon black to silica. The rubber used in automobile parts is flexible and exhibits basic characteristics of high strength and elongation. However, as the filler is changed to silica, its physical properties, such as tensile strength and elongation, are lower than those of the existing carbon black base. Therefore, it is necessary to evaluate the mechanical properties with the addition of the EPDM compound using silica as a base without degrading the physical properties of EPDM. In this study, an experiment based on the additive content was performed using the mixture experimental planning method to analyze the mechanical properties according to the additive type and mixing ratio of silica-based EPDM. The mixing ratio of the four additives was set using a simplex lattice design, and the tensile strength, elongation, modulus 300%, and permanent compression reduction rate were analyzed for mechanical characteristics, and rheometer experiments were performed for vulcanization characteristics. Through statistical analysis of the measured data, the main effects and interactions of the EPDM-blended rubber additives were analyzed. These results can be used to derive a mixing ratio of additives that satisfies the required characteristics of the EPDM compound.