HYPER 빔창주위의 열유동 해석에 의한 안전성 평가에 관한 연구

송민근,최진호,주은선,송태영 경상대학교 생산기술연구소 2000 生産技術硏究所論文集 Vol.16 No.-

A spent fuel problem has prevented the nuclear power from claiming to be a completely clean energy source. The nuclear transmutation technology to incinerate the long lived radioactive nuclides and produce energy during the incineration process is believed to be one or the best solutions. HYPER(Hybrid Power Extraction Reactor)is the accelerator driven transmutation system which is being developed by KAERI(Korea Atomic Energy Research Institute). Some major feature of HYPER have been developed and employed. On-power fueling concepts are employed to keep system power constant with minimum variation of accelerator power. A hollow cylinder-type metal fuel is designed for the on-line refueling concept. Lead-bismuth(Pb-Bi) is adopted as a coolant and Spallation target material. One of the issues related to the HYPER target system is the thermal and mechanical loads imposed on the Pb-Bi and the beam window. FLUENT is used for thermal-hydraulic calculation, and finally stress calculation is performed by ANSYS. A beam condition such as current is varied. The initial velocity of Pb-Bi is also varied.

비글개에서 l-muscone의 급성독성 및 아급성독성시험 연구

유아선,권오경,성하정,곽형일,방명주,박대규,정규혁,윤효인,조명행 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

Single and 4 weeks oral administration of l-muscone, a major active ingredient of musk, to beagle dogs of both sexes were performed to investigate both acute and subacute toxicity. Beagle dogs(3 males and 3 females) in acute experiments were administered orally with single dosage of 2,000 ㎎/㎏ and groups of 9 male and 9 female beagle dogs in subacute experiments were given daily different dosage of l-muscone, 0.2㎎/㎏/day(low dosage group), 2 ㎎/㎏/day(middle dosage group), or 20 ㎎/㎏day(high dosage group) once a day for 4 weeks by oral route according to the Established Regulation of Korean Food and Drug Administration(1996.4.16). LD_50 value for beagle dogs was more than 2,000 ㎎/㎏ on oral route for both male and females. In animals administered with l-muscone, there were neither dead animals nor significant changes of body weights. In addition, no differences were found between control and treated groups in clinical signs, urinalysis, eye examination, hematology, serum chemistry, organ weight and other findings. No histolopathological lesions were observed in both control and treatment groups. Above data strongly suggest that l-muscone in beagle dogs is considered to be safe.

Differentially Expressed Genes under Cold Acclimation in Physcomitrella patens

( Ming Ming Sun ),( Lin Hui Li ),( Hua Xie ),( Rong Cai Ma ),( Yi Kun He ) 생화학분자생물학회 2007 BMB Reports Vol.40 No.6

Differentially Expressed Genes under Cold Acclimation in Physcomitrella patens

Sun, Ming-Ming,Li, Lin-Hui,Xie, Hua,Ma, Rong-Cai,He, Yi-Kun Korean Society for Biochemistry and Molecular Biol 2007 Journal of biochemistry and molecular biology Vol.40 No.6

Cold acclimation improves freezing tolerance in plants. In higher plants, many advances have been made toward identifying the signaling and regulatory pathways that direct the low-temperature stress response; however, similar insights have not yet been gained for simple nonvascular plants, such as bryophytes. To elucidate the pathways that regulate cold acclimation in bryophytes, we used two PCR-based differential screening techniques, cDNA amplified fragment length polymorphism (cDNA-AFLP) and suppression subtractive hybridization (SSH), to isolate 510 ESTs that are differentially expressed during cold acclimation in Physcomitrella patens. We used realtime RT-PCR to further analyze expression of 29 of these transcripts during cold acclimation. Our results show that cold acclimation in the bryophyte Physcomitrella patens is not only largely similar to higher plants but also displays distinct differences, suggests significant alteration during the evolution of land plants.

Overexpression of starch branching enzyme 1 gene improves eating quality in japonica rice

Ming-Mao Sun,이혜정,Sailila E Abdula,지무근,조용구 한국식물생명공학회 2013 식물생명공학회지 Vol.40 No.2

Eating quality of rice attracts more and more attention from rice-eating consumers in the recent years. Thus, improvement of eating quality of cooked rice has become one of the most important breeding goals in japonica rice. Here, the generation of transgenic japonica rice with improved eating quality and grain yield are reported. Overexpression of OsSbe1 gene encoding rice starch branching enzyme 1 was driven by 35S promoter. Eleven independent homozygous T3 transgenic lines were characterized and had shown higher palatability (71.2 ~ 72.6) than wild type Gopum (70.4). Moreover, transgenic rice lines showed an increase in 1000-grain weight and number of spikelets per panicle compared with the wild type. The yield of milled rice was 562.8 ~ 596.7 kg/10a in eight T3 lines, but 542.1 kg/10a in wild type. Gene expression analyses in mRNA transcription and enzyme activity levels suggest that improved eating quality is due to the up-regulation of OsSbe1 gene.

A Resonant Characteristics Analysis and Suppression Strategy for Multiple Parallel Grid-connected Inverters with LCL Filter

Sun, Jian-jun,Hu, Wei,Zhou, Hui,Jiang, Yi-ming,Zha, Xiao-ming The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4

Multiple parallel inverters have multiple resonant frequencies that are influenced by many factors. This often results in stability and power quality problems. This paper develops a multiple input multiple output model of grid-connected inverter systems using a closed-loop transfer function. The influence factors of the resonant characteristics are analyzed with the developed model. The analysis results show that the resonant frequency is closely related to the number, type and composition ratio of the parallel inverters. To suppress resonance, a scheme based on virtual impedance is presented, where the virtual impedance is emulated in the vicinity of the resonance frequency. The proposed scheme needs one inverter with virtual impedance control, which reduces the design complexity of the other inverter controllers. Simulation and experimental tests are carried out on two single phase converter-based setups. The results validate the correctness of the model, the analytical results and the resonant suppressing scheme.

Chemerin reverses the malignant phenotype and induces differentiation of human hepatoma SMMC7721 cells

Ming Li,Pengcheng Sun,Kaikai Dong,Ye Xin,Aslee TaiLulu,Qinyu Li,Jing Sun,Min Peng,Ping Shi 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.2

Chemerin exhibits an inhibitory eff ect on hepatocellularcarcinoma; however, the underlying mechanismis unclear. Here, low chemerin expression was confi rmedin samples of liver cancer patients and hepatoma cells. Chemerin altered hepatoma cell morphology but had noeff ect on normal hepatocytes. Chemerin inhibited proliferationof several human hepatoma cell lines. Real-time PCRdetection of hepatocellular carcinoma markers showed thatmRNA levels of albumin and A-type gamma-glutamyltransferase increased whereas those of alpha-fetoprotein,alkaline phosphatase, B-type gamma-glutamyl transferase,insulin-like growth factor II, and human telomerase reversetranscriptase decreased in chemerin-treated SMMC7721cells. Western blotting revealed that chemerin up-regulatedalbumin and vimentin expressions, and downregulated alpha-fetoprotein expression. Phosphorylated STAT3 wassignifi cantly up-regulated, whereas phosphorylated ERKand AKT were signifi cantly downregulated by chemerin. Chemerin decreased phosphorylated ERK and AKT expressionand the cell proliferation induced by PI3K activator 740Y-P but could not signifi cantly alter phosphorylated STAT3expression and the cell growth induced by STAT3 inhibitorNSC74859. In conclusion, chemerin reversed the malignantphenotype and induced SMMC7721 cell diff erentiation byinhibiting MAPK/ERK and PI3K/AKT signaling; growthinhibition by chemerin is not directly related to the JAK/STAT signaling pathway. Our study provides novel evidencethat chemerin could be utilized for liver cancer treatment.

마음의 휴식을 위한 공부 : 『팔자백선(八子百選)』과『팔가수권(八家手圈)』의 기(記)를 중심으로

Ming Sun Young 한국중국산문학회 2013 중국산문연구집간 Vol.3 No.-

本文就朝鮮第22代王正祖所編撰的『八子百選』、『八家手圈』中有關遊記的選擇理由來進行探討。『八子百選』、『八家手圈』是正祖將唐宋八大家作品中選擇自己所喜愛的文章圈出來而編成的選集。我們通過타可以了解到正祖喜歡나些文章及其選擇理由。正祖所選的文章竝不是最有名的,也不符合他的政治作風。他不喜歡奢侈放蕩的行爲,但是他所選的文章中有흔多描寫這種場面的。由此可見正祖編撰這些書竝不是爲了政治利益,而是爲了尋求精神上的和平。

Function of Global Regulator CodY in Bacillus thuringiensis BMB171 by Comparative Proteomic Analysis

( Ming Xia Qi ),( Fei Mei ),( Hui Wang ),( Ming Sun ),( Ge Jiao Wang ),( Ziniu Yu ),( Yeon Ho Je ),( Ming Shun Li ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.2

CodY is a highly conserved protein in low G+C gram-positive bacteria that regulates genes involved in sporulation and stationary-phase adaptation. Bacillus thuringiensis is a grampositive bacterium that forms spores and parasporal crystals during the stationary phase. To our knowledge, the regulatory mechanism of CodY in B. thuringiensis is unknown. To study the function of CodY protein in B. thuringiensis, BMB171codY- was constructed in a BMB171 strain. A shuttle vector containing the ORF of cry1Ac10 was transformed into BMB171 and BMB171codY-, named BMB171cry1Ac and BMB171codY-cry1Ac, respectively. Some morphological and physiological changes of codY mutant BMB171codY-cry1Ac were observed. A comparative proteomic analysis was conducted for both BMB171codY-cry1Ac and BMB171cry1Ac through two-dimensional gel electrophoresis and MALDI-TOF-MS/MS analysis. The results showed that the proteins regulated by CodY are involved in microbial metabolism, including branched-chain amino acid metabolism, carbohydrate metabolism, fatty acid metabolism, and energy metabolism. Furthermore, we found CodY to be involved in sporulation, biosynthesis of poly-β-hydroxybutyrate, growth, genetic competence, and translation. According to the analysis of differentially expressed proteins, and physiological characterization of the codY mutant, we performed bacterial one-hybrid and electrophoretic mobility shift assay experiments and confirmed the direct regulation of genes by CodY, specifically those involved in metabolism of branched-chain amino acids, ribosomal recycling factor FRR, and the late competence protein ComER. Our data establish the foundation for in-depth study of the regulation of CodY in B. thuringiensis, and also offer a potential biocatalyst for functions of CodY in other bacteria.

Interleukin 10 rs1800872 T>G Polymorphism was Associated with an Increased Risk of Esophageal Cancer in a Chinese Population

Sun, Jia-Ming,Li, Qiong,Gu, Hai-Yong,Chen, Yi-Jang,Wei, Ji-Shu,Zhu, Quan,Chen, Liang Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.6

Aim: Esophageal cancer is the eighth most common cancer and sixth leading cause of cancer associated death worldwide. The 5 year survival rate for esophageal cancer patients is very poor and accounts for only 12.3%. Besides environmental risk factors, genetic factors might play an important role in the esophageal cancer carcinogenesis. Methods: We conducted a hospital based case-control study to evaluate the genetic effects of functional single nucleotide polymorphisms (SNPs): interleukin 9 (IL9) rs31563 C>T, IL9 rs31564 G>T, IL10 rs1800872 T>G, IL12A rs2243115 T>G, IL12B rs3212227 T>G and IL13 rs1800925 C>T on the development of esophageal cancer. A total of 380 esophageal squamous cell carcinoma (ESCC) cases and 380 controls were recruited for this study. The genotypes were determined using a custom-by-design 48-Plex SNPscan$^{TM}$ Kit. Results: The IL10 rs1800872 T>G polymorphism was associated with an increased risk of ESCC. However, there were no significant links with the other five SNPs. Stratified analyses indicated no significant risk of ESCC associated with the IL10 rs1800872 T>G polymorphism evident among any subgroups. Conclusion: These findings indicated that functional polymorphism IL10 rs1800872 T>G might contribute to ESCC susceptibility. However, our results were obtained with a limited sample size, so that the power of our analysis was low. Future larger studies with more rigorous study designs of other ethnic populations are required to confirm the current findings.