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Xanthophyllomyces dendrorhous 변이군주에 의한 Carotenoids 생산 발효의 특성 연구
박기문,김영준,송민우,강석진,이재흥,Park, Ki-Moon,Kim, Young-Jun,Song, Min-Woo,Kang, Seog-Jin,Lee, Jae-Heung 한국생물공학회 2006 KSBB Journal Vol.21 No.4
Various ${\beta}$-ionone resistant mutants were isolated from the wild-type red yeast Xanthophyllomyces dendrorhous KCTC 7704. Although the growth of X. dendrorhous KCTC 7704 was strongly inhibited at 0.025 mM ${\beta}$-ionone, one of the ${\beta}$-ionone resistant mutants isolated at 0.1 mM ${\beta}$-ionone by NTG mutagenesis showed rather 70% of relative survival at 0.15 mM ${\beta}$-ionone. Fermentation kinetics study with the mutant was carried out at $20^{\circ}C$ for 4 days in 300-mL baffled flasks. The mutant yielded up to 2.3-fold higher carotenoids content(viz. $1.2{\mu}g$ of total carotenoids per mg of dry cells) compared with the wild-type strain. The production of metabolites such as organic acids could be neglected. Studies on the kinetics with various carbon substrates revealed both an increase in final dry cell mass and a higher total carotenoids content in cell mass with glucose when compared to fructose or sucrose. As a further part of study, the effect of pH on the fermentation kinetics was investigated in glucose-limited chemostat at a dilution rate of $0.04h^{-1}$. When compared to steady-state kinetic parameters obtained at pH 4.0, a significant reduction in cell concentration at pH 3.0 and a lower carotenoids content at pH 5.2 were evident. 본 연구에서는 적효모 X. dendrorhous KCTC 7704로부터 여러 ${\beta}$-ionone 내성 변이균주를 선별하였다. 야생균 KCTC 7704는 ${\beta}$-ionone 0.021 mM 농도에서 생육이 현저히 저하되었지만, NTG처리 후 ${\beta}$-ionone 0.1 mM 농도에서 선별된 변이균주는 ${\beta}$-ionone 0.15 mM에서도 70% 이상의 상대 생육율을 나타내는 매우 강한 ${\beta}$-ionone 내성을 갖고 있었다. 여러 ${\beta}$-ionone 농도에서 선별한 변이균주들을 $20^{\circ}C$에서 4일간 회분식 발효로 배양하여 그 특성을 조사하였다. 선별된 가장 우수한 변이균주는 야생균주보다 카로티노이드 생성능이 2.3배 향상(즉 $1.2{\mu}g$ of total carotenoids per mg of dry cells)되었으며 유기산과 같은 대사산물은 거의 생성하지 않았다. 여러 탄소원 들에 대한 비교 발효특성 연구 결과 과당이나 자당을 사용했을 때봐 비교하여 포도당 배지에서 최종 균체농도 및 총 카로티노이드 생성량이 많았다. 포도당이 제한되는 연속발효(dilution rate $0.04h^{-1}$) 실험을 통하여 pH의 영향을 조사한 결과 균체농도 및 총 카로티노이드 생성은 pH 4.0 조건하에서 최적인 것을 알 수 있었다.
박기문,Park, Ki Moon 한국버섯학회 2008 한국버섯학회지 Vol.6 No.1
Mushroom is well known for a safe food for a long time and, what is more, has a lot of useful characteristics related on the pharmacological activities. It is expected to be one of the most important functional food due to its diverse bioactive compounds. Especially, medical potentiality on immunomodulator and antitumor continues to be focused. Recent research trend and commercialization of functional healthy food using mushroom and its bioactive compounds will be herein introduced. Industrialization of mushroom functional substances will be also discussed.
박기문(Ki-Moon Park),김정현(Jung-Hyun Kim),고태조(Tae Jo Ko) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.3
A dental ultrasonic surgical instrument, commercially known as a scaler, is a high-value-added advanced technology that is used for tartar removal, implant operations, and gum and jaw bone surgery. In this study, the piezoelectric phenomenon for making linear motion associated with input electrical signals was studied, and the behavior of the ultrasonic vibrator was investigated by using the commercially available finite element program ANSYS® for the purpose of designing dental surgery tools. Modal analysis was carried out, and the optimal frequency range was calculated from the analyzed results. The ultrasonic vibrator was then redesigned based on the calculated optimal frequency range. The performance of the system was tested, and consequently, the proposed methodology was proven useful in vibrator design.
발명영재학급 담당교사의 요구에 터한 발명영재교육의 연구영역 조사 연구
박기문(Ki Moon Park) 한국실과교육학회 2013 한국실과교육학회지 Vol.26 No.3
이 연구의 목적은 발명영재 연구 분야에서의 발명영재학급 담당교사가 인식하는 연구과제와 실제 요구도 간의 차이를 규명하고 앞으로 발명영재교육 분야의 연구방향을 제시하고자 한다. 연구방법은 발명영재교육 교사연수에 참여하고 있는 교사 140여명 대상으로 설문조사를 실시하였다. 설문조사지에 의한 요구도 분석 결과는 교원연수 체제구축과 지원(6.34)→발명영재의 선발과 지원 (6.30)→발명영재 교육기관 지원체제 구축(6.00)→발명영재의 진로 설정과 상담(5.70)→발명영재교원, 학부모 교육프로그램 개발(5.17)→발명영재 기초연구(4.95)→발명영재교육 정책연구(4.84)”순으로 나타났다. 타 영재 분야의 연구원은 기초 및 정책 연구가 20%가 넘으며, 과학, 수학, 예술 등과 같이 대학에서 학과 등 학문 분야로 분류된 경우에 기초 연구까지 포함하면 기초연구가 상당히 많은 편이다. 현재 발명영재교육과 발명교육에 있어서 위기는 발명교육의 학문적 기초가 부족하다는데 있다. 학교 교육과정에서 발명교육의 정의나 공교육 차원에서 발명교육이 정규 교과로서의 역할이 가능한가라는 문제가 항시 대두되고 있는 상황에서 앞으로의 발명영재교육의 방향이 기존과 같이 어느한 쪽으로 치중하게 된다면, 발명영재교육의 미래는 학술적 기초를 잃고 만다. 따라서 현장교사들이 인식하고 있는 연구 분야의 요구도도 충족시키면서 기초 및 정책연구를 병행해야 한다. 이 연구의 결과에서 추출한 8개 대항목, 28개 세부 항목의 발명영재교육 연구 분야의 중요도가 4.0 이상으로 높게 현장 교사가 인식하고 있다는 점이다. 그렇기 때문에 8개 대항목에 대하여 상대적 가중치를 두어 장단기별로 연구 과제를 추진할 필요가 있다. This investigation aims to (1) identify the differences between the research projects recognized by the teachers and those of actual demands for the gifted in invention and (2) present a future pathway for the research of education for the gifted in invention. Analysis of the needs based on the surveys shows the following priorities: system establishment and support for training of the teachers (6.34), selection and support of the gifted in invention (6.30), establishing support system for the education institute of the gifted in invention (6.00), counseling career plans for the gifted in invention (5.70), developing education programs for teachers and parents of the gifted in invention (5.17), basic research of invention (4.95) → policy research for the gifted in invention (4.84). More than 20% of research activities of other research institutes for the gifted are basic and policy research and there is even much more if academic disciplines of college such as science, mathematics, and art are included. Current crisis in education for the gifted in invention and education of invention lies in the lack of academic foundation in education of invention. The definition of education in invention in school curriculum and the possibility of the education in invention in public education system as a general course have been asked continually. In this situation, if the education for the gifted in invention is unbalanced, its future would lose its academic foundation. Thus, the needs for the research areas which are recognized by the teachers in the field should be satisfied while conducting basic and policy research. Eight big items and 28 specific items collected from this investigation are recognized significant (> 4.0 in significance in the research area of education for the gifted in invention) by the teachers in the field. Therefore, both long-term and short-term research projects should be conducted for the 8 big items, while considering its relative significance.
공구 형상에 따른 CFRP의 가공결함 제거에 관한 연구
박기문(Ki Moon Park),고태조(Tae Jo Ko),위전(Zhen Yu),띠루말라이 쿠마란(Thirumalai Kumaran S) 한국기계가공학회 2017 한국기계가공학회지 Vol.16 No.4
CFRP(Carbon Fiber Reinforced Plastics) has many industrial applications due to its low weight and high strength properties. Due to its superior properties, for example, excellent resistance to fatigue wear, corrosion, and breakage from fatigue, it has been widely applicable to aircraft, automotive, and medical industries and so on. The main machining for CFRP is drilling, and route milling. In case of drilling, the machining defects such as the delamination of each layer, uncut fiber, resin burning, spalling, and exit burrs are inevitable. The issue to remove such kind of defects is necessary to make CFRP parts successful. From this point of view, this paper investigates the removal effectiveness of machining defects existing at exit region with different type of tool geometries. Consequently, based on the experiments, the tool geometry is most impact factor to remove uncut fiber or resin.