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Copper-Catalyzed Asymmetric Borylallylation of Vinyl Arenes
Kim, Namhyeon,Han, Jung Tae,Ryu, Do Hyun,Yun, Jaesook THE AMERICAN CHEMICAL SOCIETY 2017 ORGANIC LETTERS Vol.19 No.22
<P>A copper-catalyzed, enantioselective method for the borylallylation of vinyl arenes is reported. The reaction produces enantioenriched and functionalized organoboron compounds by sequentially incorporating boryl and allyl groups onto the CC bond of vinyl arenes. Copper-catalyzed borylative coupling of vinyl arenes with allyl phosphates successfully proceeds in a regio- and enantioselective manner in the absence of a palladium cocatalyst.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/orlef7/2017/orlef7.2017.19.issue-22/acs.orglett.7b03022/production/images/medium/ol-2017-03022r_0007.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ol7b03022'>ACS Electronic Supporting Info</A></P>
Scalable synthesis of the C14–C23 fragment of Eribulin and Halichondrin B
Kim U Bin,Samala Srinivas,Kim Namhyeon,Bogonda Ganganna,Lago‐Santomé Hugo,Jeong Youngdo,Kim Jin,Jung Jaehun,Jeon Sung‐Hyun,Lee Seung Jong,신현석 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.12
A novel, scalable approach to the C14–C23 fragment of eribulin mesylate is disclosed. Key 2,3-Wittig rearrangement is strategically effected via [Rh] mediated decomposition of 1,2,3-triazole intermediate to derive the 2,5-trans-tetrahydrofuran motif, enabling multi-kilogram access to the desired C14–C23 fragment.
Park, Namhyeon,Lee, Tae‐,Kyung,Nguyen, Thi Thanh Hanh,An, Eun‐,Bae,Kim, Nahyun M,You, Young‐,Hyun,Park, Tae‐,Sub,Kim, Doman John Wiley & Sons 2017 Journal of the Science of Food and Agriculture Vol.97 No.9
<P>CONCLUSIONFermented buckwheat as a feed additive has the potential to produce l-carnitine- and GABA-enriched designer eggs with enhanced nutrition and homeostasis. These designer eggs pose significant potential to be utilized in superfood production and supplement industries. (c) 2016 Society of Chemical Industry</P>
안드로이드 환경에서 자바 리플렉션과 동적 로딩을 이용한 코드 은닉법
김지윤(Jiyun Kim),고남현(Namhyeon Go),박용수(Yongsu Park) 한국정보보호학회 2015 정보보호학회논문지 Vol.25 No.1
본 논문은 기존에 널리 사용되는 바이트코드(bytecode) 중심의 안드로이드 어플리케이션 코드 난독화 방법과 달리 임의의 안드로이드 어플리케이션의 DEX 파일 자체를 추출하여 암호화하고, 암호화한 파일을 임의의 폴더에 저장한 후 코드를 수행하기 위한 로더 앱을 만드는 방법을 제시한다. 이벤트 처리 정보를 은닉하기 위하여, 로더 앱 내부의 암호화된 DEX 파일은 원본 코드와 Manifest 정보 일부를 포함한다. 로더 앱의 Manifest는 원본 앱의 Manifest 정보 중에서 암호화된 클래스에 포함되지 않은 정보만을 기재하였다. 제안기법을 사용시, 첫째로 공격자는 백신을 우회하기 위해 난독화된 코드를 포함한 악성코드 제작이 가능하고, 둘째로 프로그램 제작자의 입장에서는 제안기법을 이용하여 저작권 보호를 위해 핵심 알고리즘을 은폐하는 어플리케이션 제작이 가능하다. 안드로이드 버전 4.4.2(Kitkat)에서 프로토타입을 구현하고 바이러스 토탈을 이용하여 악성코드 난독화 능력을 점검해서 제안 기법의 실효성을 보였다. Unlike existing widely used bytecode-centric Android application code obfuscation methodology, our scheme in this paper makes encrypted file i.e. DEX file self-extracted arbitrary Android application. And then suggests a method regarding making the loader app to execute encrypted file"s code after saving the file in arbitrary folder. Encrypted DEX file in the loader app includes original code and some of Manifest information to conceal event treatment information. Loader app"s Manifest has original app"s Manifest information except included information at encrypted DEX. Using our scheme, an attacker can make malicious code including obfuscated code to avoid anti-virus software at first. Secondly, Software developer can make an application with hidden main algorithm to protect copyright using suggestion technology. We implement prototype in Android 4.4.2(Kitkat) and check obfuscation capacity of malicious code at VirusTotal to show effectiveness.
Effects of counter ions on electrochromic behaviors of asymmetrically substituted viologens
Pande, Gaurav K.,Kim, Namhyeon,Choi, Jin Hui,Balamurugan, Gopal,Moon, Hong Chul,Park, Jong S. North-Holland 2019 Solar Energy Materials and Solar Cells Vol. No.
<P><B>Abstract</B></P> <P>We present effects of counter anions on electrochromic behavior of asymmetrically substituted viologens, 1-hexyl-1′-nonafluorohexyl viologens (HERFVs). For this purpose, two anions, hexafluorophosphate ([PF<SUB>6</SUB>]<SUP>–</SUP>) and bis(trifluorosulfonyl)imide ([TFSI]<SUP>–</SUP>), were employed for both HERFVs and 1-butyl-3-methylimidazolium ([BMIM]<SUP>+</SUP>)-based ionic liquids. The HERFV-containing electrochromic devices (ECDs) exhibited apparent dependence on the counter ions in terms of optical contrast, switching speed, long-term cyclic stability, coloration efficiency, and memory effect. Specifically, the ECDs based on [HERFV][PF<SUB>6</SUB>]<SUB>2</SUB> showed a redox response at −1.0 V with a color change from colorless to blue. Meanwhile, the coloration of [HERFV][TFSI]<SUB>2</SUB> appeared at −3.0 V, and a significantly long optical memory effect was observed with unstable cyclic repeatability. We attributed this discrepancy to the nature of counter ions, such as size and electronegativity, which may influence the electron transfer process during redox reactions. These results demonstrated that counter anions can exert a significant impact on the EC behaviors of asymmetrically substituted viologens. The presented approach suggests a potential tool for controlling EC properties of viologen derivatives for applications in transmissive windows and eye wear.</P>