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Yun Soo Choi,,Park, SeHee,Park, Yong Sun Wiley-VCH 2016 EUROPEAN JOURNAL OF ORGANIC CHEMISTRY Vol.14 No.-
<P>We developed a highly stereoselective C-N and C-C bond-forming reaction by carrying out a crystallization-induced dynamic resolution (CIDR) of alpha-bromo arylacetates followed by a stereoselective substitution reaction with an amine or azlactone nucleophile. Applications of this synthetic method to the preparation of highly enantioenriched nitrogen-containing six-membered heterocycles and alpha,beta-disubstituted aspartates are also presented.</P>
지식공유와 성과간의 인과구조 : 구조방정식을 활용한 지식공유의 결정모형과 성과에 대한 영향 분석
윤창근(Yun, Changgeun),최정인(Choe, Jungin),정세희(Jung, Sehee) 한국지방정부학회 2017 지방정부연구 Vol.21 No.2
지식정보화 사회에서 지식은 조직의 필수자원이며, 조직 내 지식공유는 지식의 활용가능성과 부가가치 창출능력 을 극대화하는 중요한 관리전략으로 부각되고 있다. 그러나 지식공유는 서로의 필요에 의한 지식의 교환보다는 전 달-습득의 일방적 관계에 의해 진행되는 경우가 많으며, 실제 현장에서는 지식공유가 그 중요성만큼 활발하지 못하 다. 본 연구는 지식공유를 활성화시키는 구조적 요인(공식화, 집단/합리 문화, 거래적 리더십)과 관계적 요인(조직 신뢰, 의사소통)을 검증하였다. 지식공유의 결정모형 외에 본 연구는 성과를 조직성과와 개인성과로 구분하여 지식 공유와의 관계를 분석하였다. 본 연구의 분석에 따르면, 지식공유는 조직성과에 긍정적 영향을 미치지만, 개인성과 에는 유의한 영향력을 갖고 있지 않다. 지식공유가 항상 상호 호혜적이지 않음을 고려하면, 참여자 간의 성과향상에 대한 기대 차이가 발생한다. 즉, 지식습득자는 전달받은 지식을 활용하여 개인성과를 증진시키지만, 지식전달자에 게는 새롭게 습득한 지식이 없기 때문에 당장의 개인성과 향상을 기대할 수 없다. 이러한 연구결과는 지식공유의 활 성화를 위한 제도적 지원의 필요성을 시사한다. Knowledge is considered as the core resource in the age of knowledge information society. Therefore, knowledge sharing within organization is being emphasized as an important management strategy that maximizes the capacity to create added value and utilize knowledge. However, the level of knowledge sharing is not on par with its importance within public organizations. This study analyzes the relationship between performance and knowledge sharing by looking at organizational performance and individual performance separately. According to the analysis, knowledge sharing has a positive impact on organizational performance, whereas it has no significant impact on individual performance. Knowledge sharing is not always a reciprocal exchange for all participants. Individuals who acquire new knowledge may enhance their performance by utilizing the new knowledge. However, individuals who deliver knowledge cannot expect to immediately improve their performance, since they did not acquire new knowledge. Such results of the study imply the necessity of systematic support for facilitating sharing in public organizations.
Jeong, Sehee,Kim, Min Woo,Jo, Yong-Ryun,Kim, Tae-Yun,Leem, Young-Chul,Kim, Sang-Woo,Kim, Bong-Joong,Park, Seong-Ju American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.34
<P>We report the crystal-structure-dependent piezotronic and piezo-phototronic effects of ZnO/ZnS core/shell nanowires (CS NWs) having different shell layer crystalline structures. The wurtzite (WZ) ZnO/WZ ZnS CS NWs showed higher electrical transport and photosensing properties under external strain than the WZ ZnO/zinc blende (ZB) ZnS CS NWs. The WZ ZnO/WZ ZnS CS NWs under a compressive strain of −0.24% showed 4.4 and 8.67 times larger increase in the output current (1.93 × 10<SUP>-4</SUP> A) and photoresponsivity (8.76 × 10<SUP>-1</SUP> A/W) than those under no strain. However, the WZ ZnO/ZB ZnS CS NWs under the same strain condition showed 3.2 and 2.16 times larger increase in the output current (1.13 × 10<SUP>-4</SUP> A) and photoresponsivity (2.16 × 10<SUP>-1</SUP> A/W) than those under no strain. This improvement is ascribed to strain-induced piezopolarization charges at both the WZ ZnO NWs and the grains of the WZ ZnS shell layer in WZ ZnO/WZ ZnS CS NWs, whereas piezopolarization charges are induced only in the ZnO core region of the WZ ZnO/ZB ZnS CS NWs. These charges can change the type-II band alignment in the ZnO and ZnS interfacial region as well as the Schottky barrier height at the junction between the semiconductor and the metal, thus facilitating electrical transport and reducing the recombination probability of charge carriers under UV irradiation.</P> [FIG OMISSION]</BR>
국내산 프로폴리스 추출물의 기능성 플라보노이드 성분 및 함량 비교 연구
윤찬건(Yun, Chan-Gun),조세희(Cho, Sehee),김성준(Kim, Seong-Jun),이중헌(Lee, Jung-Heon),정강현(Jung, Gang-Hyeon),김지인(Kim, Jee-In),소인섭(So, In-Seop),박영현(Park, Young-Hyeon),임재환(Lim, Jae-Hwan) 한국과학영재교육학회 2021 과학영재교육 Vol.13 No.3
프로폴리스에 함유된 다양한 플라보노이드 성분은 생산 지역에 따라 함량이 다르기 때문에 그 표준화가 어렵다. 본 연구에서는 먼저 프로폴리스의 추출방법을 최적화하고, 두 번째로 프로폴리스 추출물의 지역별 플라보노이드 함량의 차이를 비교하고 주요 성분의 효능을 비교하였다. 지역별 프로폴리스의 총 폴리페놀 함량을 측정하고 DPPH assay를 통해 항산화 효능을 확인하였다. HPLC 분석을 통하여, 주요 플라보노이드 성분인 quercetin, caffeic acid, p-coumaric acid, pinocembrin, kaempferol, galangin 및 chrysin의 프로폴리스 내 함유량을 정량하였다. 마지막으로 β-hexosaminidase release assay를 통해 quercetin의 항알레르기 효능을 확인하였다. 경상북도 안동, 봉화, 군위에서 생산된 프로폴리스 추출물의 항산화 효과는 각각 80.2%, 72.4%, 54.5%였다. 프로폴리스 추출물의 플라보노이드 함량은 지역별로 차이가 있었으며 quercetin, pinocembrin, galangin, chrysin의 함량이 공통적으로 가장 높았다. Quercetin의 β-hexosaminidase 방출이 양성대조군의 약 25%로 나타나 알레르기 억제 효능을 확인하였다. 본 연구에서 프로폴리스 추출법의 표준화와 더불어 지역별 프로폴리스 추출물의 플라보노이드 함량과 각 성분별 효능을 비교하였으며, 플라보노이드에 의한 천연 항알레르기제의 활용 가능성을 제시하였다. Standardization of the various flavonoid components contained in propolis is very difficult because the contents vary depending on the production regions. In this study, first, the extraction method of propolis was optimized, secondly, the differences in flavonoids contents by region of propolis extract were compared and the biological effects of major components were compared. The total polyphenol contents of propolis from different regions were measured and the antioxidant effects were confirmed by DPPH assay. Through HPLC analysis, the contents of major flavonoids including quercetin, caffeic acid, p-coumaric acid, pinocembrin, kaempferol, galangin, and chrysin in propolis were quantified. Finally, the antiallergic effect of quercetin was confirmed through a beta-hexosaminidase release assay. The antioxidant effects of propolis extracts produced in Andong, Bonghwa, and Gunwi in Gyeongsangbuk-do were 80.2%, 72.4%, and 54.5%, respectively. The contents of flavonoids in the propolis extract varied by production region, and quercetin, pinocembrin, galangin, and chrysin were the highest contents in common. Inhibition activity of beta-hexosaminidase release by quercetin showed about 75% reduction efficacy compared to the positive control group. In this study, we compared the contents of flavonoids in propolis extracts from various regions and the effects of each component and thus we suggest the semi-standardization of the propolis extraction method and the possibility of a natural antiallergic agent by flavonoids.
구강 미생물 7종에 대한 멘톨과 불소치약의 항균 활성 비교 연구
조세희(Cho, Sehee),안태규(Ahn, Tae-Kyu),윤찬건(Yun, Chan-Gun),김지우(Kim, Jiwoo),전예담(Jeon, Yedam),황진서(Hwang, Jinseo),김지인(Kim, Jee-In),이현경(Lee, Hyeongyeong),임재환(Lim, Jae-Hwan) 한국과학영재교육학회 2020 과학영재교육 Vol.12 No.3
구강에는 600종 이상의 미생물이 존재하는 것으로 보고되고 있다. 알코올과 항생제 제품을 대체하여 천연물을 사용한 구강 위생 제제의 개발연구가 보고되고 있으나, 특정 성분들의 균주별 항균 활성 등에 관한 연구는 부족하다. 본 연구에서는 멘톨, 녹차 추출물, 불소치약, 플루오린화나트륨을 사용하여 구강 미생물 7종 -S. mutans, E. coli, B. subtilis, S. aureus, B. cereus, P. aeruginosa, L. brevis- 에 대한 항균효능을 확인하고자 하였다. 디스크 확산법을 통해 멘톨(200 mg/mL)은 구강 미생물 7종, 치약의 경우는 2종의 균주 -S. mutans, B. cereus- 에서 10.4~ 21.9 mm의 clear zone이 형성되는 것을 확인하였다. 불소치약과 멘톨의 복합 처리 시에는 구강 미생물 4종에서 증가된 항균 활성을 확인하였다. 또한 MIC 분석을 통해, 멘톨은 200~500 ㎍/mL의 농도에서 모든 균주에 대한 최소억제농도를 확인할 수 있었고 플루오린화나트륨의 경우 E. coli에서 40 ㎍/mL의 억제농도를 확인할 수 있었다. 결과적으로, 구강청결제 및 구강질환 항생물질의 대체소재로서 멘톨의 활용 가능성을 제시하고자 한다. More than 600 kinds of microorganisms exist in the oral cavity. Studies on the development of oral hygiene preparations using natural products as a substitute for alcohol and antibiotic products have been reported, but studies on the antibacterial activity of specific ingredients by strain are insufficient. In this study, menthol, green tea extract, fluoride toothpaste, and sodium fluoride were used against 7 kinds of oral microorganisms, S. mutans, E. coli, B. subtilis, S. aureus, B. cereus, P. aeruginosa, L. brevis. Using the disk diffusion method, It was confirmed that clear zones of 10.4 to 21.9 mm are formed in 7 types of oral microorganisms when menthol (200 mg/mL) is treated and 2 strains, S. mutans and B. cereus, when treated with fluoride toothpaste. When combined treatment with fluoride toothpaste and menthol, increased antibacterial activity was observed in four oral microbes. Through the MIC analysis, the minimum inhibitory concentration of menthol for all strains was confirmed at a concentration of 200-500 ㎍/mL, and the inhibitory concentration of sodium fluoride was confirmed at 40 ㎍/mL in E. coli. As a result, we suggest that the possibility of using menthol as a substitute for oral cleansers and antibiotics for oral diseases.
Sumoylation of histone deacetylase 1 regulates MyoD signaling during myogenesis
Joung, Hosouk,Kwon, Sehee,Kim, Kyoung-Hoon,Lee, Yun-Gyeong,Shin, Sera,Kwon, Duk-Hwa,Lee, Yeong-Un,Kook, Taewon,Choe, Nakwon,Kim, Jeong Chul,Kim, Young-Kook,Eom, Gwang Hyeon,Kook, Hyun Nature Publishing Group 2018 Experimental and molecular medicine Vol.50 No.1
<P>Sumoylation, the conjugation of a small ubiquitin-like modifier (SUMO) protein to a target, has diverse cellular effects. However, the functional roles of the SUMO modification during myogenesis have not been fully elucidated. Here, we report that basal sumoylation of histone deacetylase 1 (HDAC1) enhances the deacetylation of MyoD in undifferentiated myoblasts, whereas further sumoylation of HDAC1 contributes to switching its binding partners from MyoD to Rb to induce myocyte differentiation. Differentiation in C2C12 skeletal myoblasts induced new immunoblot bands above HDAC1 that were gradually enhanced during differentiation. Using SUMO inhibitors and sumoylation assays, we showed that the upper band was caused by sumoylation of HDAC1 during differentiation. Basal deacetylase activity was not altered in the SUMO modification-resistant mutant HDAC1 K444/476R (HDAC1 2R). Either differentiation or transfection of SUMO1 increased HDAC1 activity that was attenuated in HDAC1 2R. Furthermore, HDAC1 2R failed to deacetylate MyoD. Binding of HDAC1 to MyoD was attenuated by K444/476R. Binding of HDAC1 to MyoD was gradually reduced after 2 days of differentiation. Transfection of SUMO1 induced dissociation of HDAC1 from MyoD but potentiated its binding to Rb. SUMO1 transfection further attenuated HDAC1-induced inhibition of muscle creatine kinase luciferase activity that was reversed in HDAC1 2R. HDAC1 2R failed to inhibit myogenesis and muscle gene expression. In conclusion, HDAC1 sumoylation plays a dual role in MyoD signaling: enhancement of HDAC1 deacetylation of MyoD in the basally sumoylated state of undifferentiated myoblasts and dissociation of HDAC1 from MyoD during myogenesis.</P>
물체 감지센서와 폰트 라이브러리를 이용한 지능형 레이저 마킹 시스템에 관한 연구
안성혁(Sunghyuk Ahn),강동은(Dongeun Kang),오세훈(Sehoon Lee),박세희(Sehee Park),이윤(Yun Yi) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The laser marking system is the representative factory automation system that records the manufacturer's information on the case of products. According to the strengthen of the law of PL(Product Liability), the needs for laser marking system are increased more and more. But, the conventional laser marking system has some critical drawbacks in terms of the operation such as the compatibility with the used production line and the difficulty of adopting the various language and font. In this study, we are proposed the method that adopts various language and font without changing of used production line using the object detection sensor and font library. we expect that Suggested method will be contributed in increase adoptability and productivity of the laser marking system.