Sang‐Ho Lee

Korea Research Institute of Chemical Technology

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Jin Chul Kim

Ulsan National Institute of Science and Technology

Young Il Park

Korea Research Institute of Chemical Technology

Ji‐Eun Jeong

Korea Research Institute of Chemical Technology

M.J.W. Rodwell

University of California, Santa Barbara

Yun Chan Kang

Korea University

Byeong‐Su Kim

Yonsei University

Hyocheol Jung

Korea Research Institute of Chemical Technology

A. C. Gossard

University of California, Santa Barbara

Seung Man Noh

Korea Research Institute of Chemical Technology

Won Bae Kim

Government of the Republic of Korea

Cooperative Institutions

Government of the Republic of Korea

114

Seoul National University

101

GP Batteries (China)

Robert Bosch (Germany)

University of California, Santa Barbara

Korea University

Korea Research Institute of Chemical Technology

Weatherford College

Laboratoire de Chimie Moléculaire et Thioorganique

Korea Advanced Institute of Science and Technology

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CCDC 640688: Experimental Crystal Structure Determination

The Cambridge Structural Database (2007)

Sung‐Gon Kim Sang‐Ho Lee Tae-Ho Park

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccphpc6

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Graphical Abstract: Angew. Chem. Int. Ed. 41/2021

Angewandte Chemie International Edition (2021)

Anna Hartmann Wei‐Hui Fang Alon Golubchik L. Lopes V. Singh

INT

10.1002/anie.202184111

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Preparation and Characterization of Organic Thin-Film Transparent Electrode using Conducting Polyaniline

Journal of the Korean Electrochemical Society (2010)

Sun-Joo Oh Ue-Jin Lee Jong-Jin Yoon Myung-Jo Jung Suck-Hyun Lee

전도성 폴리아닐린을 합성하여 용액 공정을 적용한 유기박막 투명전극을 제조, 그 특성을 조사하였다. 용액에 분산된 폴리아닐린을 스핀코팅하여 얻어진 박막 전극은 200 nm의 두께에서 $380{\Omega}/m^2$ 의 면저항을 보였고, 450 nm 이상의 파장에서 85% 이상의 균일한 광투과성을 나타내었다. 전극의 $130^{\circ}C$이상의 온도변화에서는 비교적 높은 저항변화율이 관찰되었다. The highly conductive polyaniline was synthesized and investigated on the properties of its thin film electrode fabricated by solution process. The transmittance and sheet resistance of the polyaniline thin film of 200 nm thickness were observed in 85% in absorption range above 450 nm and $380P{\Omega}/{\Box}$, respectively. The sheet resistance of the polyaniline was largely varied above $130^{\circ}C$ annealing temperature.

Polyaniline nanofibers

Characterization

10.5229/jkes.2010.13.3.175

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Identification and Characterization of Genes Involved in Cysteine Auxotrophy in Salmonella typhi

Journal of Life Science (2008)

Sang‐Ho Lee Sam-Woong Kim Jong-Earn Yu Ah-Young Yoo Young‐Hee Kim

In spite of long research period for Salmonella typhi, little information is known about the pathogenesis mechanism of human typhoid fever caused by S. typhi due to lack of infection model in animals. A wild-type of S. typhi Ty2 strain requires cysteine to grow on minimal media. We hypothesized that this cysteine requirement may restrict colonization of S. typhi in animals during infection process. Among the S. typhi strains carrying Salmonella typhimurium genomic library, we have isolated three S. typhi transformants growing on minimal media without cysteine. Although there were three ORFs in DNA of pBP71, the STM1490 ORF complemented cysteine auxotrophy of S. typhi. Analysis of the deduced amino acid sequence of the STM1490 homolog in S. typhi revealed that there are differences in two amino acids. Plasmids containing amino acid substitutions in STM1490 supported S. typhi growth on minimal media without cysteine, indicating irrelevance of these two amino acids to STM1490 function. These results tells us that there are other factors or systems involved in cysteine requirement of S. typhi.

Auxotrophy

Identification

10.5352/jls.2008.18.11.1507

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Design of Topology‐Controlled Polyethers toward Robust Cooperative Hydrogen Bonding

Advanced Functional Materials (2023)

Junhee Kim Soonyoung Choi Jinsu Baek Yong Il Park Jin Chul Kim

Abstract Topology control of polymers is critical for determining their physical properties and potential applications; in particular, topologies that incorporate numerous hydrogen bonding (H‐bonding) donors and acceptors along the polymer chains considerably influence the formation of different inter‐ and intramolecular H‐bonding motifs. In this study, the high‐level control of inter‐ and intramolecular H‐bonding is investigated in topology‐controlled poly(glycidoxy carbonyl benzoic acid)s (PGCs). Three types of topology‐controlled PGCs (i.e., linear, hyperbranched, and branched cyclic structures having a similar degree of polymerization) are prepared by introducing aromatic carboxylic acids into the corresponding polyglycidols (PGs) via quantitative post‐polymerization modification with phthalic anhydride. The obtained three types of PGCs demonstrated the high‐level interplay between the inter‐ and intramolecular H‐bonding in polymer chains by exhibiting the pH‐dependent self‐association properties in the solution state and the strong adhesion properties in the bulk state with high transparency. Interestingly, the dramatically enhanced adhesive property by 2.6‐fold is demonstrated by simple mixing of branched cyclic PGC and topology‐controlled PGs to promote the cooperative H‐bonding between polymer chains. The new class of cooperative H‐bonding is anticipated between topology‐controlled polymers to contribute to the development of advanced adhesive and the high potential in biological and biomedical applications due to its excellent biocompatibility.

10.1002/adfm.202302086

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5% 불화나트륨을 함유한 고분자 접착필름의 법랑질 재광화효과

Jih Myeong-kwan Sang‐Ho Lee Lee Nan Young

Source

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Effects of amide types DCCAs on the properties of Y2O3:Eu phosphor powders with spherical shape and fine size

Journal of the Ceramic Society of Japan (2008)

Hye Young Koo Sang‐Ho Lee Yun Chan Kang

The effects of amide types drying control chemical additives on the morphologies, BET surface areas, pore sizes, crystal structures, and photoluminescence intensities of the Y2O3:Eu phosphor powders prepared by spray pyrolysis were investigated. The phosphor powders obtained from the spray solutions with N,N-dimethylacetamide (DMA) and N,N-dimethylformamide (DMF) had filled inner structures, low surface areas and high photoluminescence intensities under vacuum ultraviolet illumination. The photoluminescence intensity of the phosphor powders obtained from the spray solution with DMA was 120% of that of the phosphor powders obtained from the spray solution without drying control chemical additive.

Dimethylacetamide

Spray pyrolysis

Amide

Ultraviolet

10.2109/jcersj2.116.955

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The effects of hotel employee’s perceived coaching leadership on constructive voice: Dual mediating effect of psychological empowerment and psychological ownership

Korean Journal of Hospitality & Tourism (2020)

Sang‐Ho Lee Hyung-Ryong Lee

본 연구는 인적자원관리가 중요한 호텔기업의 직원들을 대상으로 연구를 실시하였으며, 호텔상사의 코칭리더십으로 인한 건설적 발언행동을 향상시키기 위해 코칭리더십, 심리적 임파워먼트, 심리적 주인의식 및 건설적 발언행동 간의 구조적 관계를 실증적으로 검증하였다. 본 논문은 서울, 대구 및 부산 시내에 위치한 4성 호텔과 5성 호텔에서 1년 이상 재직 중인 정규직 직원을 대상으로 2020년 2월 6일부터 2020년 3월 20일까지 총 15개 호텔에 각각 30부씩 총 450부의 설문지를 배포 및 회수하였다. 설문지는 편의표본 추출방법으로 자료를 수집하였고 회수된 설문지 가운데 불성실 응답 및 결측치가 있는 설문 129부는 제외하고, 남은 321부의 표본만을 유효 표본으로 선정하여 자료분석에 활용하였다. 가설검증 전 측정항목의 타당성을 확보하기 위하여 확인적 요인분석 및 신뢰도 분석을 실시하였으며 매개효과모형에 적합한지 검증하였다. 가설검증 결과 첫째, 코칭리더십과 건설적 발언행동 간의 관계에서 심리적 임파워먼트와 심리적 주인의식의 매개역할을 확인하였으며 두 변수 각각 매개효과를 나타내는 것으로 검증되었다. 둘째, 코칭리더십과 건설적 발언행동 간의 관계에서 심리적 임파워먼트와 심리적 주인의식으로 이어지는 이중매개효과를 검증한 결과, 심리적 임파워먼트와 심리적 주인의식이 순차적으로 유의한 영향을 미치는 결과가 나왔다. 본 연구에서는 설정된 모형을 검증하고 코칭리더십과 건설적 발언행동 사이에서 심리적 임파워먼트와 심리적 주인의식의 효과분석을 위해 프로세스 매크로를 활용하였다. 그리고 각 개념 간의 관계에서 총효과, 직접효과 및 간접효과에 대하여 확인하였으며 연구모형에 대한 통계적 유의성을 제시하였다. 이러한 실증분석을 통해 호텔직원이 지각한 호텔상사의 코칭리더십, 심리적 임파워먼트, 심리적 주인의식 및 건설적 발언행동 간의 영향관계를 검증하고, 이를 바탕으로 학문적 시사점, 실무적 시사점 그리고 향후 연구방향을 제시하였다.

Constructive

10.24992/kjht.2020.10.29.07.79.

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Highly active cobalt(II) and copper(II) complexes supported by aminomethylquinoline mediating stereoselective ring‐opening polymerization of rac‐lactide

Bulletin of the Korean Chemical Society (2024)

J. S. Lee Saira Nayab Ameet Kumar Dongil Kim Hyewon Jung

Abstract Cobalt(II) and copper(II) complexes supported by 4‐(quinolin‐2‐ylmethyl)morpholine (L) were characterized, and their reactivity toward the ring‐opening polymerization (ROP) of rac ‐lactide ( rac ‐LA) was studied. The use of [LMCl 2 ]/LiO i Pr and [LMCl 2 ]/LiMe (M = Co, Cu) resulted in over 95% conversion within 10 min at 25 °C. The effect of the initiating group and geometry of the metal complexes steered the heterotactic enchainment of the resultant polylactide(PLA). The Co(II)/LiMe system represents the first example of the ROP of rac ‐LA with high heterotactic enchainment ( P r = 0.92) with 98% conversion at 0 °C.

Lactide

Reactivity

10.1002/bkcs.12828

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Eco-Friendly Cotton Dyeing: Breakthroughs with Azo-Azide Reactive Dyes in Supercritical Fluid Systems

Eun Jeong Seo Hung Eun Bae Jang Hye Kyeong Hyo Chul Jung Ji‐Eun Jeong

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Environmentally Friendly

10.2139/ssrn.4779159

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