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        • SCOPUSKCI등재

          Metarrhizium anisopliae(Metschn.) Sorok이 생산하는 Biopolymer YU-122의 생산과 그 특성

          최용석,옥승호,유주현,배동현 한국산업미생물학회 1997 한국미생물·생명공학회지 Vol.25 No.1

          토양으로부터 분리한 Metarrhizium anisopliae (Metschn.) Sorok이 생산하는 biopolymer를 정제하여 분석하고, 그의 생산조건을 검토하였다. 탄소원으로 mannitol, 질소원으로는 polypepton을 사용했을 때 가장 많은 biopolymer를 생산하였고 K_2HPO_4 및 CaCl_2를 첨가함으로서 생산량이 더욱 증가하였다. 또한 이 biopolymer를 정제하여 그 분자량과 구성성분을 검토한 결과 Metarrhizium anisopliae(Metschn.) Sorok이 생산하는 Biopolymer YU-122는 분자량이 1.7×10 exp (6)이고, C, H의 구성비가 1:2이며 미량의 N이 검출되었으나, 주 구성성분은 glucose와 galactose의 환원당으로 이루어져있는 전혀 새로운 biopolymer인 것으로 나타났다. To produce biopolymer, Metarrhizium anisopliae (Metschn.) Sorok was cultured in a medium containing glucose 1.0%, sucrose 2.0%, soluble starch 1.0%, yeast extract 0.5%, polypeptone 0.5%, K_2HPO_4 0.1%, MgSO_4·7H_2O 0.02%. The culture broth was centrifuged and the polymer was harvested by adding methanol to the culture supernatant. When three times of methanol was added, the polymer was coagulated and precipitated. Then it was further purifued through successive SK-1B, SA-20P, HP-20 column chromatographies. This polymer was designated as Biopolymer YU-122. C:H ratio of this Biopolymer YU-122 was 1:2 and small amount of N is detected by CHN analyzer. Glucose and galactose are main components of this polymer. Average molecular weight of this biopolymer was 1.7×10 exp (6) by Sepharose 4B gel permeation chromatography. Optimal condition for biopolymer production was investigated. When 5% of mannitol was used as a carbon source, and polypepton as a N source, highest productivity of biopolymer was achieved. C/N ratio as nutrient was also a major factor in polymer production and its optimal ratio was 3.

        • SCOPUSKCI등재
        • SCIESCOPUSKCI등재
        • HAND POSTURE RECOGNITION BASED ON SVM USING ON MOBILE PHONE

          Bai yu,Sang-Yun Park,Eung-Joo Lee 한국멀티미디어학회 2009 한국멀티미디어학회 학술발표논문집 Vol.2009 No.2

          In this paper, we present a novel method of hand posture recognition using on telephone. In this algorithm, we first detect the hand areas by used YCbCr skin-color likelihood algorithm. It is based the nature of skin color clustering in the distribution of CbCr and the maximum likelihood principle. Secondly we correct 300 hundred hand posture pictures which are transform to gray level to training the system by using Support Vector Machines (SVM) algorithm. And we will get the characteristic vectors of hand postures which are saved in hand-gesture.xml file. Thirdly we use the characteristic vectors compare with the detected hand areas by SVM to recognize hand postures. Finally we carried out a simulation experiment on a Windows XP system to evaluate the efficiency of the proposed algorithm. It can be seen from the experimentation that the system can achieve good recognition results.

        • SCISCIE

          Formation of bioceramic coatings containing hydroxyapatite on the titanium substrate by micro-arc oxidation coupled with electrophoretic deposition

          Bai, Yu,Park, Il Song,Park, Hyeoung Ho,Bae, Tae Sung,Lee, Min Ho Wiley Subscription Services, Inc., A Wiley Company 2010 JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B Vol.b95 No.2

          <P>Bioactive ceramic coatings on titanium substrates were prepared successfully by micro-arc oxidation coupled with electrophoretic deposition (MAO and EPD) in NaOH electrolyte solution containing hydroxyapatite (HA) particles. The HA suspensions with various NaOH concentrations were prepared by ultrasonic dispersion. The microstructure, as well as the elemental and phase composition of the coatings was examined by scanning electron microscopy, energy dispersive spectrometry, and X-ray diffraction. X-ray diffraction showed that the coatings were composed mainly of rutile, Na<SUB>2</SUB>Ti<SUB>6</SUB>O<SUB>13</SUB>, and HA phases. The composition and surface morphologies are strongly dependent on the NaOH electrolyte concentration. The corrosion behavior of the coating layers in simulated body fluids was evaluated using a potentiodynamic polarization test. The corrosion resistance of the coated sample was increased compared with the untreated titanium sample. The in vitro bioactivity assessment showed that the MAO and EPD-treated titanium substrate possesses higher apatite-forming ability than the only MAO-treated titanium substrate. In addition, the cell behavior was also examined using cell proliferation assay, cell morphology, and alkaline phosphatase activity. They obtained an agreement with the result of apatite-forming ability. The results clearly show that combining the MAO and EPD techniques provides an optimal surface for cell differentiation and osseointegration. © 2010 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2010.</P>

        • The Hand Mouse: Hand Detection and Hand Tracking

          Bai yu,Jae-Ho Shin,Eung-Joo Lee 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-

          In this paper, we present a novel method of hand detection and improve the CAMSHIFT algorithm for hand tracking. We first detect the hand by using YCbCr hand-color likelihood. It is based the nature of skin color clustering in the distribution of CbCr and the maximum likelihood principle. Then, the detect result is applied to hand tracking by using CAMSHIFT algorithm. We have improved the formula of the search window to suitable for hand. Finally we carried out experiments on a Windows XP system and achieved good tracking results.

        • KCI등재

          Influence of Korean Celebrity Endorsement on Chinese Consumers' Purchase Intention towards Fashion Goods

          ( Yu Hua Cui ),( Yu Ling Bai ) 한국패션비즈니스학회 2020 패션 비즈니스 Vol.24 No.6

          Korean celebrity endorsement is a common practice adopted by companies in China. This study assessed the impact of celebrity endorsement (trustworthiness, attractiveness, congruency, and expertise) on Chinese consumers’ intention to purchase clothes endorsed by Korean celebrities. This study used reliability and validity tests and structural equation model analysis to explore the relationship between variables using SPSS 22.0 and AMOS 22.0. This study conducted an online survey (www.sojump.com) from August 10, 2020 to August 20, 2020 and collected 370 respondents. Results show that all constructs of celebrity endorsement positively affected purchase intention and that celebrity expertise had the strongest impact. With respect to the influence of demographic variables on the constructs, gender, age, and education had a significant effect on trustworthiness; gender and age had a significant effect on attractiveness; and income had an effect on purchase intention. Marketing executives should consider using Korean celebrities for different purposes in brand advertising. Particularly, celebrity expertise, such as experience, knowledge, and skills, should receive attention while publicizing to Chinese consumers. This study contributes to the academic and practical implications of Korean celebrity endorsement.

        • SCISCIESCOPUS

          The effect of annealing temperatures on surface properties, hydroxyapatite growth and cell behaviors of TiO<sub>2</sub> nanotubes

          Bai, Yu,Park, Il Song,Park, Hyeoung Ho,Lee, Min Ho,Bae, Tae Sung,Duncan, Warwick,Swain, Michael John Wiley Sons, Ltd. 2011 Surface and interface analysis Vol.43 No.6

          <P><B>Abstract</B></P><P>Well‐ordered TiO<SUB>2</SUB> nanotubes were prepared by the electrochemical anodization of titanium in an ethylene glycol electrolyte containing 1 wt% NH<SUB>4</SUB>F and 10 wt% H<SUB>2</SUB>O at 20 V for 20 min, followed by annealing. The surface morphology and crystal structure of the samples were examined as a function of the annealing temperature by field emission scanning electron microscopy (FE‐SEM) and X‐ray diffraction (XRD), respectively. Crystallization of the nanotubes to the anatase phase occurred at 450 °C, while rutile formation was observed at 600 °C. Disintegration of the nanotubes was observed at 600 °C and the structure vanished completely at 750 °C. Electrochemical corrosion studies showed that the annealed nanotubes exhibited higher corrosion resistance than the as‐formed nanotubes. The growth of hydroxyapatite on the different TiO<SUB>2</SUB> nanotubes was also investigated by soaking them in simulated body fluid (SBF). The results indicated that the tubes annealed to a mixture of anatase and rutile was clearly more efficient than that in their amorphous or plain anatase state. The <I>in vitro</I> cell response in terms of cell morphology and proliferation was evaluated using osteoblast cells. The highest cell activity was observed on the TiO<SUB>2</SUB> nanotubes annealed at 600 °C. Copyright © 2010 John Wiley & Sons, Ltd.</P>

        • KCI등재후보

          Possible Applications for Fascial Anatomy and Fasciaology in Traditional Chinese Medicine

          Yu Bai,소광섭,Byung-Cheon Lee,Yong Huang,Chun-lei Wang,Jun Wang,Jin-peng Wu,Jing-xing Dai,Janos Palhalmi,Ou Sha,David Tai Wai Yew,Lin Yuan 사단법인약침학회 2010 Journal of Acupuncture & Meridian Studies Vol.3 No.2

          Research using medical imaging instruments such as computed tomography and magnetic resonance imaging has led to the proposal that the fascial network distributed over the human body is the anatomical basis for the acupoints and meridians of traditional Chinese medicine. Therefore, we put forward a new theory of anatomy called fascial anatomy. In fascial anatomy, a human body is divided into two major systems. One is the supporting-storing system of unspecialized connective tissues. The other is a functional system. An undifferentiated non-specific connective tissue network, with the participation of the nervous and the immune systems, constitutes the supporting-storing system of the human body. The various differentiated functional cells in the body that are supported and surrounded by the supporting-storing system constitute the functional system. The discipline that studies the supporting-storing system and the mutual relationship between this system and the functional system in a living human body is called fasciaology. The establishment of fascial anatomy and fasciaology opens a new research field in anatomy; consequently, fasciaology will play a significant role in biological medicine and traditional Chinese medical research, as well as future clinical practice.

        • SCIESCOPUSKCI등재

          Optimization of Siderophore Production by Bacillus sp. PZ-1 and Its Potential Enhancement of Phytoextration of Pb from Soil

          Yu, Sumei,Teng, Chunying,Bai, Xin,Liang, Jinsong,Song, Tao,Dong, Liying,Jin, Yu,Qu, Juanjuan The Korean Society for Microbiology and Biotechnol 2017 Journal of microbiology and biotechnology Vol.27 No.8

          In this study, the siderophore-producing characteristics and conditions of Bacillus sp. PZ-1 were investigated and the enhancement of siderophores on Pb uptake and translocation in Brassica juncea were determined. Results of single factor experiment showed that glucose, pH, and $Pb(NO_3)_2$ could stimulate PZ-1 growth and siderophore production. The maximum siderophore production of 90.52% siderophore units was obtained by response surface methodology optimization at the glucose concentration of 21.84 g/l, pH 6.18, and $Pb(NO_3)_2$ concentration of $245.04{\mu}mol/l$. The type of siderophore was hydroxamate and its concentration in the fermentation broth amounted to $32.24{\mu}g/ml$. Results of pot experiments indicated that the siderophores enhanced B. juncea to assimilate more Pb from soil with the uptake ratio from 1.04 to 2.74, and to translocate more Pb from underground to overground with the TF values from 1.21 to 1.48. The results revealed that Bacillus sp. PZ-1 could produce abundant siderophores and might be potentially used to augment the phytoextraction of Pb from soil.

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