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Jin, Taewon,Kim, Oh Yoen,Shin, Min-Jeong,Choi, Eun Young,Lee, Sung Sook,Han, Ye Sun,Chung, Ji Hyung American Chemical Society 2014 Journal of agricultural and food chemistry Vol.62 No.43
<P>Adiponectin, an adipokine, has been described as showing physiological benefits against obesity-related malfunctions and vascular dysfunction. Several natural compounds that promote the expression and secretion of adipokines in adipocytes could be useful for treating metabolic disorders. This study investigated the effect of fisetin, a dietary flavonoid, on the regulation of adiponectin in adipocytes using 3T3-L1 preadipocytes. The expression and secretion of adiponectin increased in 3T3-L1 cells upon treatment with fisetin in a dose-dependent manner. Fisetin-induced adiponectin secretion was inhibited by peroxisome proliferator-activated receptor (PPAR) antagonists. It was also revealed that fisetin increased the activities of PPARs and silent mating type information regulation 2 homologue 1 (SIRT1) in a dose-dependent manner. Furthermore, the up-regulation of adiponectin and the activation of PPARs induced by fisetin were prevented by a SIRT1 inhibitor. Fisetin also promoted deacetylation of PPAR γ coactivator 1 (PGC-1) and its interaction with PPARs. SIRT knockdown by siRNA significantly decreased both adiponectin production and PPARs–PGC-1 interaction. These results provide evidence that fisetin promotes the gene expression of adiponectin through the activation of SIRT1 and PPARs in adipocytes.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2014/jafcau.2014.62.issue-43/jf502849j/production/images/medium/jf-2014-02849j_0007.gif'></P>
상지추출물의 단회/반복투여 독성 및 복귀돌연변이능 평가
한태원(Taewon Han),엄민영(Min Young Um),임영희(Young Hee Lim),김정근(Jeong-Keun Kim),김인호(In-Ho Kim) 한국식품영양과학회 2016 한국식품영양과학회지 Vol.45 No.10
상지추출물의 독성을 복귀돌연변이, 단회투여 및 반복투여독성 등 다각적으로 적용하여 평가하였다. 상지추출물의 복귀돌연변이 실험을 Salmonella Typhimurium의 히스티딘 요구성 균주 4종과 Escherichia coli의 트립토판 요구성 균주 1종을 이용하여 대사활성계 적용 및 비적용 하에서 Ames test를 실시하였다. 대사활성계 유무에 상관없이 5,000 μg/plate의 처리 농도까지 복귀돌연변이 콜로니 수는 증가되지 않았으므로 상지추출물은 복귀돌연변이를 유발하지 않는 것으로 판단하였다. SD rats 암수에 1,250, 2,500 및 5,000mg/kg의 농도로 단회 경구투여 하고 14일 동안 일반증상, 운동성, 식이섭취량, 사망 여부 및 체중 변화를 조사한 결과, 사망동물은 관찰되지 않았으며 대조군과 비교하여 실험동물의 암수 모두에서 시험물질 투여에 따른 일반적인 증상 변화는 나타나지 않았다. 대조군과 시험군은 모두 정상적인 체중 증가가 관찰되었고 대조군과 비교하여 상지추출물 투여군의 유의적인 체중 변화는 나타나지 않았으며, LD50은 암수 모두 5,000 mg/kg 이상인 것으로 판단하였다. 또한, 상지추출물을 500, 1,000 및 2,000 mg/kg/d의 용량으로 28일간 반복 경구투여 하면서 실험동물의 일반증상, 사망동물의 유무, 체중 변화, 식이섭취량, 혈액학적 및 혈액생화학적 변화, 부검 후 육안적 검사를 통한 병변의 유무를 관찰하였다. 시험기간 동안 암수 모든 군에서 반복 투여로 인한 사망동물이 없었으며 정상적인 체중 증가가 나타났다. 대조군과 비교하여 상지추출물의 투여에 따른 체중 변화는 통계학적으로 유의성이 없었으며 암수 모두 대조군과 비교하여 식이섭취량의 차이 및 유의할만한 일반증상도 관찰되지 않았다. 시험물질의 투여에 따른 장기 무게, 혈액학적 분석 결과 및 혈액생화학적 분석 결과 등에서도 독성 및 이상소견이 발견되지 않았다. This study was carried out to evaluate the toxicity of ethanolic extracts of Morus alba L. branch (ME). In the reverse mutation test, Salmonella Typhimurium TA98, TA100, TA1535, TA1357, and Escherichia coli WP2uvrA were used to estimate the mutagenic potential of ME. Sprague-Dawley rats were orally administered ME at levels of 1,250, 2,500, and 5,000 mg/kg for the single-dose toxicity test and 500, 1,000, and 2,000 mg/kg/d for the repeated-dose toxicity test for 28 consecutive days. As expected, reverse mutation was not detected at any concentration of ME, regardless of application of the metabolic activation system with or without S9 mix. In the single-dose toxicity test, ME caused neither significant visible signs of toxicity nor mortality in rats, and LD50 was estimated to be over 5,000 mg/kg. In the repeated-dose toxicity test, ME administration at 500, 1,000, and 2,000 mg/kg for 28 days to male or female rats did not result in mortality. Similarly, no toxicologically significant treatment-related changes in body weight, food intake, or organ weights were noted. Several hematological and biochemical parameters in both genders showed significant differences, but these were within normal ranges. These results support the safe use of ME.
Phosphorescence Color Tuning of Cyclometalated Iridium Complexes by <i>o</i>-Carborane Substitution
Kim, Taewon,Kim, Hyungjun,Lee, Kang Mun,Lee, Yoon Sup,Lee, Min Hyung American Chemical Society 2013 Inorganic Chemistry Vol.52 No.1
<P>Heteroleptic (<I>C</I><SUP>∧</SUP><I>N</I>)<SUB>2</SUB>Ir(acac) (<I>C</I><SUP>∧</SUP><I>N</I> = 4-<I>CBppy</I> (<B>1</B>); 5-<I>CBppy</I> (<B>2</B>), 4-<I>fppy</I> (<B>4</B>) <I>CB</I> = <I>ortho</I>-methylcarborane; <I>ppy</I> = 2-phenylpyridinato-C<SUP>2</SUP>,N, 4-<I>fppy =</I> 2-(4-fluorophenyl)pyridinato-C<SUP>2</SUP>,N, acac = acetylacetonate) complexes were prepared and characterized. While <B>1</B> exhibits a phosphorescence band centered at 531 nm, which is red-shifted compared to that of unsubstituted (<I>ppy</I>)<SUB>2</SUB>Ir(acac) (<B>3</B>) (λ<SUB>em</SUB> = 516 nm), the emission spectrum of <B>2</B> shows a blue-shifted band at 503 nm. Comparison with the emission band for the 4-fluoro-substituted <B>4</B> (λ<SUB>em</SUB> = 493 nm) indicates a substantial bathochromic shift in <B>1</B>. Electrochemical and theoretical studies suggest that while carborane substitution on the 4-position of the phenyl ring lowers the <SUP>3</SUP>MLCT energy by a large contribution to lowest unoccupied molecular orbital (LUMO) delocalization, which in turn assigns the lowest triplet state of <B>1</B> as [d<SUB>π</SUB>(Ir)→π*(<I>C</I><SUP>∧</SUP><I>N</I>)] <SUP>3</SUP>MLCT in character, the substitution on the 5-position raises the <SUP>3</SUP>MLCT energy by the effective stabilization of the highest occupied molecular orbital (HOMO) level because of the strong inductive effect of carborane. An electroluminescent device incorporating <B>1</B> as an emitter displayed overall good performance in terms of external quantum efficiency (6.6%) and power efficiency (10.7 lm/W) with green phosphorescence.</P><P>The introduction of an <I>o</I>-carborane to the 4- and 5-position of the phenyl ring of a <I>ppy</I> ligand in heteroleptic (<I>C</I><SUP>∧</SUP><I>N</I>)<SUB>2</SUB>Ir(acac) complexes gave rise to red and blue shifts of the phosphorescence band, respectively, compared to that of (<I>ppy</I>)<SUB>2</SUB>Ir(acac). PhOLED devices incorporating the 4-carborane substituted Ir(III) complex as a phosphorescent emitter displayed good performance with green phosphorescence.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/inocaj/2013/inocaj.2013.52.issue-1/ic3015699/production/images/medium/ic-2012-015699_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ic3015699'>ACS Electronic Supporting Info</A></P>
Bio-Multimedia Auto Control System의 구현
조민관(Min Gwan Jo),유형열(Hyoung-Yul Yu),오태원(Taewon Oh) 한국IT서비스학회 2009 한국IT서비스학회 학술대회 논문집 Vol.2009 No.3
본 논문에서는 운전자의 감성 정보를 이용하여 자동차를 제어하는 새로운 개념의 바이오 멀티미디어 오토 컨트롤시스템을 제안한다. 인간의 감성을 나타내는 생체신호로는 맥박, 혈압, 긴장도 등등이 될 수 있는데, 본 논문에서는 생체신호 중 하나인 적외선 맥박신호를 적용해 바이오 멀티미디어 오토 컨트롤시스템을 구성 하였다. 본 논문은 운전자의 맥박 정보를 자동차로 전송하여, 긴급 시에 자동으로 자동차를 제어하는 시스템 구현에 관한 연구이다.
Kim, Taewon,Lee, Junseong,Lee, Sang Uck,Lee, Min Hyung American Chemical Society 2015 Organometallics Vol.34 No.14
<P>Heteroleptic tris-cyclometalated Ir(III) complexes supported by the o-carboranyl-phosphine ligand (CBP), (C boolean AND N)(2)Ir(CBP) (C boolean AND N = ppy (1), dfppy (2)), have been synthesized and characterized. The PL spectra of 1 and 2 displayed substantially blue shifted phosphorescence relative to the corresponding Ir(C boolean AND N)(3) complexes. Electrochemical and theoretical studies showed that the CBP ligand functioned as a strong-field ancillary ligand, and the greater HOMO stabilization in comparison to that of the LUMO by the CBP ligand was responsible for the increase in band gap, leading to a large blue shift in phosphorescence.</P>
대규모 그리드 환경에서 고속 임무 재계획 가능한 다중 에이전트 트랜스포머 기반 커버리지 경로 계획 연구
김태원(Taewon Kim),민지홍(Jihong Min),김창익(Changick Kim) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
CPP(Coverage Path Planning) techniques have been studied for development of various applications such as surveillance, smart farming, photogrammetry, robot vaccum cleaning, etc. To make successful mssion planning for given tasks such as military operation or cleaning duties, applying CPP with multiple robots will be effective to clear the mission. However, in general, mCPP(Multi-Robot Coverage Path Planning) increases computational complexity as the number of robots increases and it becomes difficult to quickly find the optimal solution. We introduce a suboptimal, turn-minimizing transformer based mCPP algorithm that can be applicable to large scale gridworld and is capable of rapid mission replanning.