• 한국식품과학회지
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• 제6권3호
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• pp.169-176
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• 1974

국내의 변질미(變質米)에서 분리 동정(同定)된 Aspergillus flavus 7균주의 aflatoxin 생성능(生成能)을 조사하기 위하여 쌀에 인위적으로 배양후 추출, 분리, 정량한 결과 모든 균주가 aflatoxin 특히 $B_1$을 많이 생성하였고 $G_1$은 생성하지 못하였다. 이들 균주의 aflatoxin 생성능(生成能)은 배양기의 변색과정 및 chloroform 추출액의 색깔과 밀접한 관계가 있었다. Aflatoxin을 가장 많이 생성한 균주는 A. flavus var. columnaris로서 쌀에서 최고 1ppm의 aflatoxin $B_1$을 생성하였으며 정제된 aflatoxin $B_1$은 자외선 흡수(吸收) 스펙트럼과 water 및 acetate adduct에 의한 유도체(誘導體)형성에 의하여 동정(同定)하였다.

• 품질경영학회지
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• 제45권2호
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• pp.175-189
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• 2017

Purpose: This study aims to built the manual for quality assurance at development stages based on the system engineering to prevent the lack of mass product capability in advance. Methods: This study have proposed quality baseline and review guidelines of outputs in system development stages for R&D quality assurance of Domestic weapons systems Results: We apply the this method to 21 projects of military area in 2016, and we present 1,291 supplementary requirements such as adding the missing test items. Conclusion: This method contribute to minimize the gap between the quality of development and production and reduce the configuration management effort during the initial production.

• Journal of Periodontal and Implant Science
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• 제21권1호
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• pp.176-176
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• 1991

• 미생물학회지
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• 제3권2호
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• pp.9-14
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• 1965

The enzyme-producing potentials of industrially important strains of Aspergillus spp. were studied. Irradiation of three original isolates of Aspergillus oryzae to ultra-violet rays resulted in the production of mutants which differed from the parent riboflavin and vitamin $B_{12}$ in culture media. 1. Irradition three strains of Aspergillus oryzae to ultraviolet light produced mutants and two strains of them were selected for soy sauce brewing. 2. The two strains are the physiological mutants of Aspergillus oryzae. Both were found to have superior enzyme activity to their relatives. 3. Aspergillus oryzae UV-induced mutant 172-722 and 569-713 were more powerful than others in the production of riboflavin and vitamin $B_{12}$. The enzyme activity of these strain were high and decreased only slightly even in 20 percent solution of NaCl. 4. Aspergillus oryzae UV-induced mutant 172-722 had more powerful protease producibility in wheat bran media than in modified Czapek's solution. On the contrary, Aspergillus oryzae UV-induced mutant 569-713 had more powerful producibility of saccharogenic and dextrinogenic amylase in modified Czapek's solution than in mold bran. 5. Aspergillus oryzae UV-induced mutant 172-722 formed the spore rapidly and Aspergillus oryzae UV-induced mutant 569-713 did ordinarily. 6. It is found from the results that Aspergillus oryzae UV-induced mutant 172-722 is valuable material for the manufacture of soy sauce because of its high protease activity in 20 percent solution of NaCl. Aspergillus oryzae UV-induced mutant 569-713 is suitable for soy bean mash and for fermented red pepper sauce for its high saccharogenic and dextrinogenic amylase activity in 20 percent solution of sodium chloride.

• 한국식품과학회지
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• 제10권1호
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• pp.46-51
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• 1978

황변미독(黃變米毒)의 일종인 luteoskyrin의 동정(同定) 및 정량법(定量法)을 검토한 후 변질미에서 분리된 Pen. islandicum의 luteoskyrin 생성능(生成能)을 추구한 결과는 다음과 같다. 1) Luteoskyrin은 0.5 N oxalic acid impregnated silicagel G plate로서 acetone : n-hexane : water(6:3:1.5, upper layer)를 전개용매로하는 TLC방법에서 분리(分離)가 가장 좋았다. 분리된 황색물질의 최대흡수파장(吸收波長)은 426, 448nm이었으며 chromatogram을 태양광선에 $2{\sim}3$시간 노출시 자색(紫色)으로 변하였다. 2) Luteoskyrin의 정량법으로서 TLC전개(展開)후 용출비색법(溶出比色法)에서는 4 ppm, densitometry에서는 0.1 ppm이 검출한계(檢出限界)이었다. 미곡 중의 허용량(許容量)을 3.68 ppm이하로 정설할 경우 곡류시료 중 luteoskyrin의 검색(檢索)에는 densitometry가 적합할 것이다. 3) Pen. islandicum에 의한 luteoskyrin 생성능은 Czapek 액체배지에서는 균계체(菌系體) 1g당 11mg, 가압살균한 쌀에서는 1g당 40mg이었다.

• 품질경영학회지
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• 제33권3호
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• pp.91-104
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• 2005

Tolerance analysis plays an important role in design and manufacturing stages for reducing manufacturing cost by improving producibility. In most production processes encountered in practice, a process mean may shift or drift in the long run although process is in control. This study discusses the feasibility of three most common inflation factors(Bender, Gilson and Six Sigma) as a correction to Root Sum of Squares(RSS) method to compensate heuristically for a shift of process mean and nonnormal component distributions from simulation experiments and proposes the guidelines for choosing the inflation factor.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 봄 학술발표회 논문집(I)
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• pp.37-44
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• 1998

The objective of this study is development of high strength lightweight concrete and application or structural use. For this, mix proportions for each strength level were selected from lab tests, and adapted to producing ready-mixed concrete in batcher plant. It was very important to prewet the lightweight aggregates sufficiently for producibility and also workability. Splitting tensile strength of high-strength lightweight concrete produced has lower values than that of normal weight concrete, but modulus of rupture and modulus of elasticity are not less than normal weight concrete. The strength reduction factor ($\lambda$) for sand-lightweight concrete make higher than 0.85 present in structures using high-strength lightweight concrete. And it was showed that not parabola distribution but triangular distribution of stress in compression zone.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.189-192
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• 2002

The autoclave process is frequently utilized in the manufacturing of aircraft parts because of the low void content and high fiber volume fraction. However, due to the slow curing process (5∼8 hours per part) and it's limited producibility for complicated shape, this process is very expensive and applied to the relatively simple geometry structures. RTM is considered as an alternative process to overcome the limitation of autoclave process. In this study, the idea of RTM application on the secondary Fairing structure of aircraft has been proved to be technically feasible and very cost effective by changing the multiple part of subassembly into one integral composite structure.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.5-9
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• 2002

This paper presents a method and procedure for stress analysis and sizing in development of structures of a large composite wind turbine blade. Structural requirement of IEC standard was reviewed to set up appropriate analysis method and procedure. Several structural layouts were examined in a viewpoint of a large scale wind turbine blade. For the critical load cases, stress analysis were performed using finite element method. Stacking sequence and thickness of a laminate for each part and location were determined considering stress levels and producibility. Nonlinear geometric analysis was performed to check stability problem due to local buckling of a skin structures.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1842-1846
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• 2008

This work reports development of novel liquid-level sensors based on the $3{\omega}$ method. The sensors determine the liquid level by measuring the thermal response as in the conventional hot-wire technique. However the sensors employ an AC heating method to enhance the sensitivity, noise resistance and time response. Also, the microfabricated thin-film structure of the sensor provides mass-producibility as well as improved sensor performance owing to the increase in the surface-volume ratio of the sensor. Two different types of the sensor are developed: one for point detection of the fluid phase and the other for monitoring continuous variation of liquid level. Notable is that the performance of the sensor is not considerably affected by the liquid flow.