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Jongkook Jung,Seungtae Kim,Sooyeon Lee,Hunsung Kim,Myeong-Pyo Jung,Sejin Kim,Chang-Kyu Park,Eunhee Lee,Joon-Ho Lee 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.05
This study was conducted to explore if the ground beetle (Coleoptera: Carabidae) can be used as an indicator classifying habitat types. Thirteen land use types were selected as survey sites in Jeonju. Ground beetles were collected by 3 pitfall traps (15 cm diameter) for each site from June 20 to September 22, 2008. Pitfall traps were replaced at one month interval. Total 919 ground beetles of 31 species belonging to 17 genera were collected. Land use types were classified and ordinated by two-way indicator species analysis and detrended correspondence analysis. Land use types were classified and ordinated into two major groups, forest and non-forest, by Synuchus nitidus and Dolichus halensis. Two major groups were subdivided into 4 end groups; forest, riverside, upland and other sites. Other sites group including 4 sites; levee, public garden, outfield and manufacturing area were not coincided with land use types. Nevertheless, ground beetles appear to be used as indicators of habitat types.
Lee, Ji Hyun,Jung, Aeran,Park, Han Na,Lee, Changhee,Mandava, Suresh,Lim, Sung-jun,Lim, Byoung-bok,Park, Sung-Kwan,Lee, Jongkook,Kang, Hoil Elsevier 2018 Forensic Science International Vol.291 No.-
<P><B>Abstract</B></P> <P>Illicit psychoactive substances have threatened public health worldwide. An active metabolite of ADB-CHMINACA and MDMB-CHMINACA was identified for the first time in a powder-type product found in an airmail package. The structure of compound 1 was elucidated by a combination of gas chromatography-mass spectrometry (GC–MS), liquid chromatography-high resolution mass spectrometry (LC-HRMS), infrared (IR) spectroscopy, and nuclear magnetic resonance (NMR) spectroscopy. Compound 1 was proven to be an analogue of MDMB-CHMINACA, an indazole-based synthetic cannabinoid. The methyl ester group in MDMB-CHMINACA was replaced with a carboxylic acid group in compound 1. Compound 1 was determined as 2-[1-(cyclohexylmethyl)-1<I>H</I>-indazole-3-carboxamido]-3,3-dimethylbutanoic acid and named as DMBA-CHMINACA.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new indazole-3-carboxamide class synthetic cannabinoid was identified. </LI> <LI> Compound 1 was named as DMBA-CHMINACA according to the EMCDDA guideline. </LI> <LI> DMBA-CHMINACA is a hydrolysed form of MDMB-CHMINACA. </LI> <LI> DMBA-CHMINACA is a potential CB1 and CB2 agonist. </LI> <LI> DMBA-CHMINACA can work as a synthetic precursor of several synthetic cannabinoids. </LI> </UL> </P>
An, Sunhyung,Park, Jung-Hyun,Shin, Chae-Ho,Joo, Jin,Ramasamy, Easwaramoorthi,Hwang, Jongkook,Lee, Jinwoo Elsevier 2011 Carbon Vol.49 No.4
<P><B>Abstract</B></P><P>Oxygen reduction reaction (ORR) catalysts, Pd<SUB>3</SUB>Pt<SUB>1</SUB> nanoparticles with methanol tolerance, are supported on various carbon supports: mesocellular carbon foam (MSU-F-C), CMK-3, and Vulcan XC-72. The particle size of Pd<SUB>3</SUB>Pt<SUB>1</SUB> (∼5nm) is larger than the pore size of CMK-3 (∼3nm), resulting in the agglomeration of Pd<SUB>3</SUB>Pt<SUB>1</SUB> nanoparticles on the external surface of the CMK-3. The large surface area and large pore size of MSU-F-C allows a high degree of dispersion of Pd<SUB>3</SUB>Pt<SUB>1</SUB> nanoparticles inside the pores. Due to its highly dispersed state, the Pd<SUB>3</SUB>Pt<SUB>1</SUB>/MSU-F-C shows higher ORR activity than Pd<SUB>3</SUB>Pt<SUB>1</SUB>/Vulcan XC-72 and Pd<SUB>3</SUB>Pt<SUB>1</SUB>/CMK-3. The charge transfer resistance (<I>R</I><SUB>ct</SUB>), as measured by electrochemical impedance spectroscopy, increases in the order of Pd<SUB>3</SUB>Pt<SUB>1</SUB>/CMK-3>Pd<SUB>3</SUB>Pt<SUB>1</SUB>/Vulcan XC-72>Pd<SUB>3</SUB>Pt<SUB>1</SUB>/MSU-F-C. Pd<SUB>3</SUB>Pt<SUB>1</SUB>/MSU-F-C is methanol tolerant at 400rpm in the presence of 0.5M CH<SUB>3</SUB>OH, while methanol oxidation peaks are observed in the case of Pd<SUB>3</SUB>Pt<SUB>1</SUB>/Vulcan XC-72 and Pd<SUB>3</SUB>Pt<SUB>1</SUB>/CMK-3.</P>
Jeong, Inyoung,Jo, Changshin,Anthonysamy, Arockiam,Kim, Jung-Min,Kang, Eunae,Hwang, Jongkook,Ramasamy, Easwaramoorthi,Rhee, Shi-Woo,Kim, Jin Kon,Ha, Kyoung-Su,Jun, Ki-Won,Lee, Jinwoo Wiley-VCH 2013 ChemSusChem Vol.6 No.2
<P>A disulfide/thiolate (T(2)/T(-)) redox-couple electrolyte, which is a promising iodine-free electrolyte owing to its transparent and noncorrosive properties, requires alternative counter-electrode materials because conventional Pt shows poor catalytic activity in such an electrolyte. Herein, ordered mesoporous tungsten suboxide (m-WO(3-x)), synthesized by using KIT-6 silica as a hard template followed by a partial reduction, is used as a catalyst for a counter electrode in T(2)/T(-)-electrolyte-based dye-sensitized solar cells (DSCs). The mesoporous tungsten suboxide, which possesses interconnected pores of 4 and 20 nm, provides a large surface area and efficient electrolyte penetration into the m-WO(3-x) pores. In addition to the advantages conferred by the mesoporous structure, partial reduction of tungsten oxide creates oxygen vacancies that can function as active catalytic sites, which causes a high electrical conductivity because of intervalence charge transfer between the W(5+) and W(6+) ions. m-WO(3-x) shows a superior photovoltaic performance (79 % improvement in the power conversion efficiency) over Pt in the T(2)/T(-) electrolyte. The superior catalytic activity of m-WO(3-x) is investigated by using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curve analysis.</P>
Chun, Jinyoung,Jo, Changshin,Sahgong, Sunhye,Kim, Min Gyu,Lim, Eunho,Kim, Dong Hyeon,Hwang, Jongkook,Kang, Eunae,Ryu, Keun Ah,Jung, Yoon Seok,Kim, Youngsik,Lee, Jinwoo American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.51
<P>Metal fluorides (MFx) are one of the most attractive cathode candidates for Li ion batteries (LIBs) due to their high conversion potentials with large capacities. However, only a limited number of synthetic methods, generally involving highly toxic or inaccessible reagents, currently exist, which has made it difficult to produce well-designed nanostructures suitable for cathodes; consequently, harnessing their potential cathodic properties has been a challenge. Herein, we report a new bottom-up synthetic method utilizing ammonium fluoride (NH4F) for the preparation of anhydrous MFx (CuF2, FeF3, and CoF2)/mesoporous carbon (MSU-F-C) nanocomposites, whereby a series of metal precursor nanoparticles preconfined in mesoporous carbon were readily converted to anhydrous MFx through simple heat treatment with NH4F under solventless conditions. We demonstrate the versatility, lower toxicity, and efficiency of this synthetic method and, using XRD analysis, propose a mechanism for the reaction. All MFx/MSU-F-C prepared in this study exhibited superior electrochemical performances, through conversion reactions, as the cathode for LIBs. In particular, FeF3/MSU-F-C maintained a capacity of 650 mAh g(FeF3)(-1) across 50 cycles, which is similar to 90% of its initial capacity. We expect that this facile synthesis method will trigger further research into the development of various nanostructured MFx for use in energy storage and other applications.</P>