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李한배,李庸揆,吳世汎,片宗根 명지대학교 공학기술연구소 1988 공학기술연구소 논문집 Vol.3 No.-
In harbor design, it is a necessary condition to retain calmness inside a harbor. For this purpose, breakwaters are disposed as exterior structures against incident waves. There are cases that necessitate main and auxiliary breakwaters according to frequent directions of incident waves. In these cases, harbor entrances have various geometric shapes in horizontal plane. In the program developed here, harbor entrances are classified into six different cases by the disposition of breakwaters and the attack angle of incident waves. For each case, the diffraction phenomena inside and around harbor entrance are analysed by superposing the solutions of Sommerfeld's. The method gives fairly good results compared with those reported before, and also is proved to be computationally very efficient. Therefore, the method may be applicable to the preliminary design of breakwater dispositions, and also the program can be used as the basic subroutine in the calculation of wave height distributions inside a harbor with reflected waves.
김인호,맹학영,한규범 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
연속적 미생물 성장 측정을 위해 배양 세포의 형광을 이용하는 방법에 대하여 가능성과 문제점들을 알아보고 computer를 연결시켜 발효조 내의 미생물 농도를 on-line으로 측정할 수 있는 시스템을 구성하였다. 실험 결과 세포의 형광을 이용한 미생물 성장의 연속 측정 방법은 배지 조성물의 영향을 배제한다면 실용화 가능성이 좋은 방법임을 알 수 있었다. 높은 세포 농도에서도 희석없이 미생물 농도의 측정이 가능하며 특히, 발효조의 기존 sampling line을 이용하여 배양액을 순환시켜 fluorometer로 형광을 측정하는 방법을 간단히 발효조에 적용하여 사용할 수 있는 장점이 있다. Fluorometer에서 나오는 신호를 computer로 처리한 결과 효과적으로 발효조의 미생물 성장을 관찰할 수 있었다. Culture Fluorescence was measured to follow the cell growth in a fermentor. Signals from a fluorometer were connected to an Apple computer via A/D converter and operational amplifier. Medium composition should be considered to avoid a high background fluorescence originated from fluorophores in the medium. Measuring fluorescence has an advantage over the O.D. measurement since no dilution is needed at a high cell concentration. Cell broth circulated through a flow cell in the fluorometer provides us with monitoring cell growth in the fermentor.
Environmental factors affecting development of Aspergillus nidulans
Han, Kap-Hoon,Lee, Dong-Beom,Kim, Jong-Hak,Kim, Min-Su,Han, Kyu-Yong,Kim, Won-Shin,Park, Young-Soon,Kim, Heui-Baik,Han, Dong-Min The Microbiological Society of Korea 2003 The journal of microbiology Vol.41 No.1
Aspergillus nidulans, a homothalic ascomycete, has a complete sexual reproductive cycle as well as an asexual one. Both sexual and asexual development are known to be genetically programmed, but are also strongly affected by environmental factors including nutrients, light, temperature and osmolarity. We have examined these factors to define favored conditions for fruiting body (cleistothecium) formation. In general, fruiting body formation was enhanced where carbon and nitrogen sources were sufficient. Limitation of C-source caused predominant asexual development while inhibiting sexual development. When higher concentrations of glucose were supplied, more cleistothecia were formed. Other carbon sources including lactose, galactose and glycerol made the fungus develop cleistothecia very well, whereas acetate caused asexual sporulation only. Organic nitrogen sources like casein hydrolysate and glycine, and an increase in nitrate or ammonium concentration also enhanced sexual development. In addition to nutrient effects, low levels of aerobic respiration, caused either by platesealing or treatment with various chemicals, favored sexual development. Carbon limitation, light exposure and a high concentration of salts promoted asexual development preferentially, suggesting that stress conditions may drive the cell to develop asexual sporulation while comfortable and wellnourished growth conditions favored sexual development.
Enhanced SMAD1 Signaling Contributes to Impairments of Early Development in CFC-iPSCs.
Han, Kyu-Min,Kim, Seung-Kyoon,Kim, Dongkyu,Choi, Jung-Yun,Im, Ilkyun,Hwang, Kyu-Seok,Kim, Cheol-Hee,Lee, Beom Hee,Yoo, Han-Wook,Han, Yong-Mahn AlphaMed Press 2015 Stem Cells Vol.33 No.5
<P>Cardio-facio-cutaneous (CFC) syndrome is a developmental disorder caused by constitutively active ERK signaling manifesting mainly from BRAF mutations. Little is known about the role of elevated ERK signaling in CFC syndrome during early development. Here, we show that both SMAD1 and ERK signaling pathways may contribute to the developmental defects in CFC syndrome. Induced pluripotent stem cells (iPSCs) derived from dermal fibroblasts of a CFC syndrome patient (CFC-iPSCs) revealed early developmental defects in embryoid body (EB) development, β-catenin localization, and neuronal differentiation. Both SMAD1 and ERK signalings were significantly activated in CFC-iPSCs during EB formation. Most of the β-catenin was dissociated from the membrane and preferentially localized into the nucleus in CFC-EBs. Furthermore, activation of SMAD1 signaling recapitulated early developmental defects in wild-type iPSCs. Intriguingly, inhibition of SMAD1 signaling in CFC-iPSCs rescued aberrant EB morphology, impaired neuronal differentiation, and altered β-catenin localization. These results suggest that SMAD1 signaling may be a key pathway contributing the pathogenesis of CFC syndrome during early development.</P>
Regulation of nsdD Expression in Aspergillus nidulans
Han, Kap-Hoon,Han, Kyu-Yong,Kim, Min-Su,Lee, Dong-Beom,Kim, Jong-Hak,Chae, Suhn-Kee,Chae, Keon-Sang,Han, Dong-Min The Microbiological Society of Korea 2003 The journal of microbiology Vol.41 No.3
The nsdD gene has been predicted to encode a GATA type transcription factor with the type IVb zinc finger DNA binding domain functions in activating sexual development of A. nidulans. In several allelic mutants of nsdD producing truncated NsdD polypeptides lacking the C-terminal zinc finger, the transcription level of nsdD gene was greatly increased. Also in an over-expressed mutant, the transcription under its own promoter was reduced. These results suggest that the expression of nsdD is negatively autoregulated. When the nsdD gene was over-expressed, cleistothecia were formed in excess amounts even in the presence of 0.6 M KC1 that inhibited sexual development of the wild type. Northern blot analysis revealed that the expression of nsdD was repressed by 0.6 M KC1. These results strongly suggest that the inhibition of sexual development by salts was carried out via the nsdD involved regulatory network.