Enumerating typical abelian prime-fold coverings of a circulant graph

Feng, R.,Kwak, J.H.,Kwon, Y.S. North-Holland Pub. Co ; Elsevier Science Ltd 2009 Discrete mathematics Vol.309 No.8

Enumerating the isomorphism classes of several types of graph coverings is one of the central research topics in enumerative topological graph theory (see [R. Feng, J.H. Kwak, J. Kim, J. Lee, Isomorphism classes of concrete graph coverings, SIAM J. Discrete Math. 11 (1998) 265-272; R. Feng, J.H. Kwak, Typical circulant double coverings of a circulant graph, Discrete Math. 277 (2004) 73-85; R. Feng, J.H. Kwak, Y.S. Kwon, Enumerating typical circulant covering projections onto a circulant graph, SIAM J. Discrete Math. 19 (2005) 196-207; SIAM J. Discrete Math. 21 (2007) 548-550 (erratum); M. Hofmeister, Graph covering projections arising from finite vector spaces over finite fields, Discrete Math. 143 (1995) 87-97; M. Hofmeister, Enumeration of concrete regular covering projections, SIAM J. Discrete Math. 8 (1995) 51-61; M. Hofmeister, A note on counting connected graph covering projections, SIAM J. Discrete Math. 11 (1998) 286-292; J.H. Kwak, J. Chun, J. Lee, Enumeration of regular graph coverings having finite abelian covering transformation groups, SIAM J. Discrete Math. 11 (1998) 273-285; J.H. Kwak, J. Lee, Isomorphism classes of graph bundles, Canad. J. Math. XLII (1990) 747-761]). A covering is called abelian (or circulant, respectively) if its covering graph is a Cayley graph on an abelian (or a cyclic, respectively) group. A covering p from a Cayley graph Cay(A,X) onto another Cay (Q,Y) is called typical if the map p:A->Q on the vertex sets is a group epimorphism. Recently, the isomorphism classes of connected typical circulant r-fold coverings of a circulant graph are enumerated in [R. Feng, J.H. Kwak, Typical circulant double coverings of a circulant graph, Discrete Math. 277 (2004) 73-85] for r=2 and in [R. Feng, J.H. Kwak, Y.S. Kwon, Enumerating typical circulant covering projections onto a circulant graph, SIAM J. Discrete Math. 19 (2005) 196-207; SIAM J. Discrete Math. 21 (2007) 548-550 (erratum)] for any r. As a continuation of these works, we enumerate in this paper the isomorphism classes of typical abelian prime-fold coverings of a circulant graph.

전기영동에 의한 한우,젖소 및 수입육의 근육단백다형에 관한 연구

권덕신,박강희,김정학,이제훈 전북대학교 농업과학기술연구소 1999 農大論文集 Vol.30 No.1

The muscle protein polymorphisms in korean native cattle, holstein, and imported beefs from Australia and U.S.A. was investigated to identify breed-specific muscle proteins, especially korean native cattle specific proteins. Muscle proteins was divided into three fractions; fraction A which contained mainly blood proteins, fraction B which contained mainly enzyme and soluble proteins and fraction C which contained mainly structural proteins. On the analysis of fraction A by SDS-polyacrylamide gel electrophoresis, the molecular weight (mw) 218k of protein band was appeared in only imported beefs from Australia not in korean native cattle, holstein, and imported beefs from U.S.A. Similarly, the mw 117k of protein band was appeared in only imported beefs from U.S.A. not in korean native cattle, holstein, and imported beefs from Australia. But the mw 35k of protein band was appeared in korean native cattle, holstein and imported beefs from Australia not in U.S.A. In fraction B, the mw 92k of protein band was appeared in only imported beefs from U.S.A. not in korean native cattle, holstein, and imported beefs from Australia. However, the mw 33k of protein band was appeared in korean native cattle, holstein and imported beefs from Australia not in U.S.A. In fraction C, the mw 155k of protein band was appeared in korean native cattle, holstein and imported beefs from Australia not in U.S.A. However the mw 120k of protein band was appeared in only imported beefs from U.S.A. not in korean native cattle, holstein, and imported beefs from Australia. Similarly the mw 110k of protein band was appeared in only imported beefs from Australia not. in korean native cattle, holstein, and imported beefs from U.S.A. Furthermore, the mw 54k and 28.5K of protein bands were not appeared in only imported beefs from Australia but in korean native cattle, holstein, and imported beefs from U.S.A on the analysis of muscle proteins by secondary electrophoresis, lot of breed-specific muscle proteins were identified. Therefore, the results of this study suggested that the breed-specific beefs can lie identified by the analysis of muscle proteins.

The microRNA miR-124 inhibits vascular smooth muscle cell proliferation by targeting S100 calcium-binding protein A4 (S100A4)

Choe, N.,Kwon, D. H.,Shin, S.,Kim, Y. S.,Kim, Y. K.,Kim, J.,Ahn, Y.,Eom, G. H.,Kook, H. Elsevier Science B.V., Amsterdam. 2017 FEBS letters Vol.591 No.7

<P>S100 calcium-binding protein A4 (S100A4) induces proliferation and migration of vascular smooth muscle cells (VSMCs). We aimed to find the microRNA regulating S100A4 expression. S100A4 transcripts are abruptly increased in the acute phase of carotid arterial injury 1 day later (at day 1) but gradually decreases at days 7 and 14. Bioinformatics analysis reveals that miR-124 targets S100A4. VSMC survival is attenuated by miR-124 mimic but increased by miR-124 inhibitor. miR-124 decreases immediately after carotid arterial injury but dramatically increases at days 7 and 14. miR-124 inhibitor-induced cell proliferation is blocked by S100A4 siRNA, whereas miR-124-induced cell death is recovered by S100A4. Our findings suggest that miR-124 is a novel regulator of VSMC proliferation and may play a role in the development of neointimal proliferation.</P>

Experimental Approach to Explosive Nucloeosynthesis with RI Beams

S. Kubono,Y. Yamaguchi,G. Amadio,S. Hayakawa,Y. Wakabayashi,Y. Kurihara,J. J. He,A. Saito,H. Fujikawa,Le Hong Khiem,M. Niikura,T. Teranishi,N. Iwasa,S. Kato,S. Nishimura,C. S. Lee,Y. K. Kwon,I. S. Hah 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1

Experimental efforts to investigate stellar reactions under high-temperature and high density conditions have been made as a major program using the RI beams from the Center for Nuclear Study (CNS) low-energy in-flight RI beam separator (CRIB) at University of Tokyo in order to understand the evolution of the universe, as well as various stellar phenomena. Specically, two subjects of hydrogen burning are discussed here. One is a reaction study of the pp-chain and the second is of the explosive hydrogen burning, the rp-process. Some s-wave resonances have been identified by the thick target method in the crucial reaction processes in the hydrogen burning. The resonant scattering with the thick target method also succeeded in identifying inelastic resonant scattering, giving proton widths for the first excited state of the target nucleus. This provided very efficiently the reaction rate estimate for the process under high-temperature equilibrium conditions. Possibilities of the CRIB facility in near future are also briey discussed. Experimental efforts to investigate stellar reactions under high-temperature and high density conditions have been made as a major program using the RI beams from the Center for Nuclear Study (CNS) low-energy in-flight RI beam separator (CRIB) at University of Tokyo in order to understand the evolution of the universe, as well as various stellar phenomena. Specically, two subjects of hydrogen burning are discussed here. One is a reaction study of the pp-chain and the second is of the explosive hydrogen burning, the rp-process. Some s-wave resonances have been identified by the thick target method in the crucial reaction processes in the hydrogen burning. The resonant scattering with the thick target method also succeeded in identifying inelastic resonant scattering, giving proton widths for the first excited state of the target nucleus. This provided very efficiently the reaction rate estimate for the process under high-temperature equilibrium conditions. Possibilities of the CRIB facility in near future are also briey discussed.

Involvement of S6K1 in mitochondria function and structure in HeLa cells

Park, J.,Tran, Q.,Mun, K.,Masuda, K.,Kwon, S.H.,Kim, S.H.,Kim, D.H.,Thomas, G.,Park, J. Pergamon Press ; Elsevier Science Ltd 2016 Cellular signalling Vol.28 No.12

The major biological function of mitochondria is to generate cellular energy through oxidative phosphorylation. Apart from cellular respiration, mitochondria also play a key role in signaling processes, including aging and cancer metabolism. It has been shown that S6K1-knockout mice are resistant to obesity due to enhanced beta-oxidation, with an increased number of large mitochondria. Therefore, in this report, the possible involvement of S6K1 in regulating mitochondria dynamics and function has been investigated in stable lenti-shS6K1-HeLa cells. Interestingly, S6K1-stably depleted HeLa cells showed phenotypical changes in mitochondria morphology. This observation was further confirmed by detailed image analysis of mitochondria shape. Corresponding molecular changes were also observed in these cells, such as the induction of mitochondrial fission proteins (Drp1 and Fis1). Oxygen consumption is elevated in S6K1-depeleted HeLa cells and FL5.12 cells. In addition, S6K1 depletion leads to enhancement of ATP production in cytoplasm and mitochondria. However, the relative ratio of mitochondrial ATP to cytoplasmic ATP is actually decreased in lenti-shS6K1-HeLa cells compared to control cells. Lastly, induction of mitophagy was found in lenti-shS6K1-HeLa cells with corresponding changes of mitochondria shape on electron microscope analysis. Taken together, our results indicate that S6K1 is involved in the regulation of mitochondria morphology and function in HeLa cells. This study will provide novel insights into S6K1 function in mitochondria-mediated cellular signaling.

Gd₂O₂S:Tb의 동시 계수 도플러 양전자 소멸법에 의한 결함 특성

이종용,배석환,김재홍,권준현,Lee, C.Y.,Bae, S.H.,Kim, J.H.,Kwon, J.H. 한국재료학회 2006 한국재료학회지 Vol.16 No.7

Coincidence Doppler Broadening (CDB) of positron annihilation spectroscopy was applied to analyze defects in the chemical state of Department of Physics, $Gd_2O_2S$:Tb intensifying screens. The screen samples were irradiated by 80 MV X-rays in hospital and were used for 0, 2, 4, and 6 years respectively. There was a positive relationship between the S-parameter values and time of exposure to X-rays. Most of the defects were indicated to have been generated by X-rays. A 1D CDB was developed in order to reduce the background noise, and the S-parameter values of the $Gd_2O_2S$:Tb intensifying screens, using the 1D CDB, varied between 0.4974 and 0.4991.

간호대학생의 이론・실습 성적과 임상수행능력의 관련성 : 성인간호학 교과목을 중심으로

권현진,김다영,김민정,김소현,박예담,박지원,왕서현,유영주,이재현,주가은,신수진 이화여자대학교간호학회 2020 이화간호학회지 Vol.- No.54

Purpose: This study aimed to explore the relationship among score of theory course, score of practicum course and clinical practice ability by the course, Adult Health Nursing. Methods: A descriptive research was conducted using questionaries. Data were collected from September 25 to October 2, 2019. Participants were 67 nursing students at one university in Seoul on their junior year who have experienced clinical settings. The collected data were analyzed by t-test, ANOVA, Cohen’s Kappa, and Scheffe’s test using SPSS 25.0 version program. Results: Participants were given a quartile number from 1 to 4 respectively according to their scores of theory course those of practicum course. The total mean score of clinical practice ability was 3.61, with a perfect score of 5. The scores of theory course and practicum course showed slight correlation(Cohen’s Kappa=.168). However, significant correlation did not existed among score of theory course, score of practicum course and clinical practice ability. Conclusion: The result showed that score of theory course, score of practicum course and clinical practice ability have no significant correlation. However, its finding suggests the necessity of further research about various approach and new evaluation methods needed in order to improve nursing students’ competency.

Oxide-free Sb₂S₃ sensitized solar cells fabricated by spin and heat-treatment of Sb(III)(thioacetamide)₂Cl₃

You, M.S.,Lim, C.S.,Kwon, D.H.,Heo, J.H.,Im, S.H.,Chae, K.J. Elsevier Science 2015 ORGANIC ELECTRONICS Vol.21 No.-

Pure Sb<SUB>2</SUB>S<SUB>3</SUB> without oxide impurities was formed by thermal decomposition of Sb(thioacetamide: TA)<SUB>2</SUB>Cl<SUB>3</SUB> precursor. From the analysis of thermal properties of Sb(TA)<SUB>2</SUB>Cl<SUB>3</SUB>, we developed a spin-coating and heat-treatment process to form pure Sb<SUB>2</SUB>S<SUB>3</SUB> thin-films with controllable thickness due to the formation of insoluble Sb<SUB>2</SUB>S<SUB>3</SUB> by heat-treatment. Through the spin-coating and heat-treatment process, we could fabricate oxide-free Sb<SUB>2</SUB>S<SUB>3</SUB> planar type sensitized solar cell with 8.12mA/cm<SUP>2</SUP> of short circuit current density (J<SUB>sc</SUB>), 0.616V of open circuit voltage (V<SUB>oc</SUB>), 45.9% of fill factor (F.F), and overall power conversion efficiency (η) of 2.3% at 1 sun condition.

이종 마찰용접 강봉재의 기계적 특성(2. PWHT)

권상우(S. W. Kwon),정원택(W. T. Jeong),공유식(Y. S. Kong),김영식(Y. S. Kim),김선진(S. J. Kim) 한국동력기계공학회 2004 한국동력기계공학회 학술대회 논문집 Vol.- No.-

Dissimilar friction welding were produced using 15㎜ diameter solid bar in chrome molybedenum steel(KS SCM440) to carbon steel(KS S45C) to investigate their mechanical properties. The main friction welding parameters were selected to endure good quality welds on the basis of visual examination, tensile tests, Virkers hardness surveys of the bond of area and HAZ and macrostructure investigations. The specimens were tested as-welded and post-weld heat-treated. The tensile strength of the friction welded steel bars was increased up to 100% of the S45C base metal under the condition of all heating time. Optimal welding conditions were n=2,000(rpm), P₁=60(MPa), P₂=100(MPa), t₁=4(s), t₂=5(s) when the total upset length is 5.4(㎜).

Bifidobacterium bifidum ATCC 11863 에 의한 우유의 발효에 관한 연구 - 발효에 의한 유성분의 변화 -

고준수(J . S . Goh),권일경(I . K . Kwon),안종건(J . K . Ahn),윤영호(Y . H . Yoon) 한국축산학회 1988 한국축산학회지 Vol.30 No.10

This research was performed to get the informations needed to manufacture fermented milk products using bifidobacteria as starter culture. The conversion of constituents in the whole milk fermented by Bifidobacterium bifidum ATCC 11863 was investigated, and the results were compared with those by several lactic acid bacteria generally used for the fermented milk products. 1. The use of lactose varied according to the kinds of bacteria, such as B. bifidum, L. acidophilus, L. casei and S. thermophilus. When the whole milk was fermented by B. bifidum, the glucose reached 480 mg per 100 ml; while galactose reached 661 mg per 100 ml when S. thermophilus was grown in whole milk. 2. B. bifidum and L. acidophilus raised the, soluble nitrogenous compounds in whole milk after 24 hours at 37℃, however, there was little change soluble nitrogenous compounds content of whole milk by L. casei and S. thermophilus. 3. The content of free amino acids was increased by B. bifidum and L. acidophilus after 24 hours at 37℃; whereas decreased when L. casei and S. thermophilus were grown. 4. The polyacrylamide gel electrophoresis evidenced no significant change of casein but distinct changes of whey protein were observed by B. bifidum, L. acidophilus, L. casei and S. thermophilus at 37℃ after 24 hours. The change of whey protein was more noticeable when whole milk was fermented by L. acidophilus and L. casei than by B. bifidum and S. thermophilus. 5. The pyruvic acid content was decreased in whole milk after 24 hours at 37℃ by B. bifidum, L. acidophilus, L. casei and S. thermophilus. Lactic and succinic acid were produced during the fermentation of whole milk by B. bifidum, L. acidophilus and L. casei but B. bifidum produced less lactic acid than other bacteria. 6. Acetic acid was increased in the whole milk by B. bifidum, L. acidophilus and L. casei after 24 hours at 37℃. It was increased more rapidly by B. bifidum than by other bacteria; however, it was decreased during the fermentation by S. thermophilus. When B. bifidum was grown in whole milk, volatile organic acids such as propionic, isobutyric, butyric, isovaleric, valeric and caproic acids were decreased.