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유건성(Geon Sung Yoo),변재훈(Jae Hoon Byeon) 한국체육교육학회 2009 한국체육교육학회지 Vol.14 No.1
The purpose of this study was self-identity of individuals with physical disabilities participating in physical activity. Subjects included 198(male: 143 female: 58) with individuals with physical disabilities. The questionnaire that was developed by Park Ah-Chung(1996) was used self-identity scale of Korean. It was revised by Lee Sung-Guk(1999) which consisted of 6 factors, 48 items. Construct validity of the instrument was checked by Factor analysis. Reliability of questions was confirmed by Cronbach`s α value(.783). The data analysis were Independent t-test, one-way ANOVA, and multiple regression analysis. The results were as follows; First, job and incomes had significant effects on self-identity of individuals with physical disabilities. Second, physical instructors, mass media, and friends had significant effects on self-identity of individuals with physical disabilities. Third, physical activity period, group exercise, and athletes with disabilities had significant effects on self-identity of individuals with physical disabilities. Fourth, high understanding of disability traits significant difference than low understanding of disabilities traits on self-identity of individuals with physical disabilities. These results implied that individuals with physical disabilities participation in physical activity had significant effects on their self-identity according to socio-demographic variables, significant other, type of physical activity, participation type of physical activity, and understanding of disability traits.
Signed-DLMS 적응 알고리즘 이용한 무선 중계 간섭 제거기
유태훈(Tae-Hoon Yoo),우대호(Dae-Ho Woo),김주완(Dae-Ho Woo),하성희(Sung-Hee Ha),반지훈(Ji-Hun Van),이종현(Jong-Hyun Lee) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
In this paper, we study the signed- DLMS adaptive algorithm of wireless repeater for solving shadow region due to propagation between base station and mobile station. The the signed-DLMS algorithm reduces interference signals from multipath and solves the oscillation problem of repeater by estimation and cancellation. To efficiently reject interference signal. the signed-DLMS adaptive algorithm is applied. The computational complexities of the signed-DLMS are reduced verse standard LMS algorithm. Wireless ICS repeater based on signed-DLMS reduces the cost and is able to increase channel capacities.
Yoo, Dae Young,Chae, Junghyun,Jung, Hyo Young,Yim, Hee Sun,Kim, Jong Whi,Nam, Sung Min,Kim, Dae Won,Choi, Jung Hoon,Seong, Je Kyung,Yoon, Yeo Sung,Hwang, In Koo Butterworths [etc.] 2015 Neurological research Vol.37 No.8
<P>In the present study, we investigated the effects of treadmill exercise on microglial activation and the subsequent release of tumour necrosis factor-alpha (TNF-alpha), interleukin (IL)-6 and IL-1-beta in the hippocampus in a rat model of type 2 diabetes.</P>
Yoo, Sang-Hoon,Liu, Lichun,Cho, Sang Hyun,Park, Sungho Wiley (John WileySons) 2012 Chemistry - An Asian Journal Vol.7 No.12
<P>Here we demonstrate that, in the dealloying process of Au-Ag nanorods, temperature is the key parameter for producing porous Au nanorods with tunable ligament sizes. The vertically aligned Au-Ag alloy nanorods were first synthesized by the electrochemical co-deposition of Au and Ag onto anodic aluminum oxide (AAO) membrane templates. Porous Au nanorods were then obtained by selectively etching Ag away from the precursor Au-Ag alloy nanorods. Control of the ligament size was achieved by controlling the dealloying temperature. Pt deposited on the porous Au nanorods with smaller ligaments exhibited a higher catalytic activity during methanol electrooxidation than those deposited on nanorods with larger ligaments produced by dealloying at higher temperatures. The strong dependence of the catalytic activity on the ligament size of porous Au is principally due to different amounts of carbon monoxide (CO) generated during methanol electrooxidation. Less CO was generated as the ligament size decreased. This finding is of importance for developing highly efficient cathode materials for carrying out methanol electrooxidation in practical applications in which porous Au with a large surface area is used as a supporting substrate.</P>
Synthetic Peptide-conjugated Titanium Alloy for Enhanced Bone Formation In Vivo
Yoo, Jeong Joon,Park, Yoon-Jeong,Rhee, Sang-Hoon,Chun, Heung Jae,Kim, Hee Joong Informa Healthcare 2012 Connective tissue research Vol.53 No.5
<P>There are growing demands for bioactive titanium implants that could shorten the healing period, promote faster rehabilitation, and thereby increase the success rate of treating patients with poor bone quality. A synthetic receptor-binding peptide mimicking bone morphogenetic protein-2 (BMP-2) was covalently linked to a titanium alloy with two types of topography—machined (TiMA) and rough (TiGB)—by using a chemical conjugation process. In vivo osseointegration capacity was evaluated chronologically using histomorphometric analysis at 2, 4, and 8 weeks after implantation in the distal femurs of rabbits. In the histologic examinations, peri-implant bone formation was more active around TiGB than TiMA. Compared to the control groups (nonconjugated TiMA and TiGB) at 2, 4, and 8 weeks, the peptide-conjugated groups (TiMA-P and TiGB-P) had more mature new bone, thicker trabeculae, more rapid bone maturation, and higher affinity index (percentage of new bone contact length) in histomorphometric analysis. Particularly, differences in the affinity index between the peptide-conjugated and nonconjugated groups were more pronounced at the early phase of peri-implant healing (2 and 4 weeks). However, at 8 weeks, enhanced bone formation was less prominent according to peptide conjugation, especially in specimens with a rough surface. The titanium alloys in the rabbit femurs led to a significant increase of bone growth when modified with bioactive peptides, especially during the early phase of bone healing. These results confirm that biochemical modifications of titanium surfaces can enhance the rate of bone healing compared with that of untreated titanium surfaces.</P>
Real-time News Video Indexing with Multi-modal Features
Sung-Yul Yoo,Dong-Wook Kang,Ki-Doo Kim,Kyeong-Hoon Jung 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, an efficient real-time indexing algorithm for news video is presented. We adopted several multi-modal lowlevel features, which are selected after observing the audio-visual characteristics of news programs, in order to detect an anchor shots in news video. The overall structure of the proposed algorithm is composed of four stages: the pause detection, the fillin and throw-away processing, the audio classification, and the matching with motion activity stage. The simulation results show that the performance of the proposed algorithm is quite acceptable while satisfying the constraint of real-time.
Yoo, Seong Jeon,Hong, Sung Myun,Jung, Hye Seung,Ahn, Ji Hoon Japanese Society of Plant Physiologists 2013 Plant & cell physiology Vol.54 No.1
<P>In Arabidopsis, long-distance movement of FLOWERING LOCUS T (FT) protein from the leaf to the shoot apex triggers flower development. In wild-type Arabidopsis plants under long-day conditions, FT is mainly expressed in the cotyledon but is weakly expressed in the first true leaf prior to floral induction. To test the importance of the cotyledon in floral induction, we developed a cotyledon micrografting (Cot-grafting) method that, unlike other grafting methods, allows the FT protein from the graft to be transported via its native route from leaves to the shoot apex. By using Cot-grafting, we found that grafting a single wild-type cotyledon onto an ft-10 mutant strongly suppressed the ft-10 late flowering phenotype. Neither Y-grafting wild-type shoots nor butt-grafting wild-type roots to ft-10 plants resulted in comparably accelerated flowering in the ft-10 recipient plants. ft-10 mutants grafted with a 35S::FT cotyledon flowered as early as wild-type plants. When phloem-specific tracers were applied to a donor cotyledon, the tracers were detected in the vein of the true leaf of recipient plants 6 d after Cot-grafting. Also, macromolecule trafficking of an FT:yellow fluorescent protein:hemagglutinin fusion occurred across the graft junction 6 d after Cot-grafting. These results suggest that Cot-grafting, which allows protein movement in a manner consistent with the natural flow of FT protein from the leaf to the shoot apex, can efficiently suppress the late flowering of ft-10 mutants. Our results further suggest that in Arabidopsis, the cotyledon is an important organ for producing FT protein to induce flowering.</P>
Pt<sub>3</sub>Y electrocatalyst for oxygen reduction reaction in proton exchange membrane fuel cells
Yoo, Sung Jong,Lee, Kug-Seung,Hwang, Seung Jun,Cho, Yong-Hun,Kim, Soo-Kil,Yun, Jeong Woo,Sung, Yung-Eun,Lim, Tae-Hoon Elsevier 2012 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.37 No.12
<P><B>Abstract</B></P><P>We report here that significant electrocatalysis occurs during oxygen reduction reaction (ORR) at the Pt<SUB>3</SUB>Y alloy thin film electrodes. In addition, we synthesized Pt<SUB>3</SUB>Y alloy nanocatalysts for use in proton exchange membrane fuel cells, fabricated by using a high pressure sputtering technique in a gaseous mixture of Ar and He. Rather than the dense film deposited by conventional sputtering techniques, the resulting structure was comprised of a Pt<SUB>3</SUB> Y alloy nanocatalyst layer with an average particle size of 10–12 nm. The Pt<SUB>3</SUB>Y alloy nanocatalysts were characterized by scanning electron microscopy, transmission electron microscopy, high-resolution X-ray photoelectron spectroscopy, and X-ray absorption near edge spectroscopy. The cell performance of the membrane electrode assembly with multiple layers of sputter-deposited Pt<SUB>3</SUB>Y alloy nanoparticles and spray-deposited Nafion–carbon-ink improved dramatically compared to that obtained with the Pt only nanoparticles. The high performance of Pt<SUB>3</SUB>Y alloy nanocatalysts fabricated at a sputtering pressure of 200 mTorr (Ar/He = 1) was due to miniaturization of the Pt<SUB>3</SUB>Y alloy particles, formation of the porous catalyst layer, and enhancement of the kinetic activity for ORR.</P> <P><B>Highlights</B></P><P>► Significant electrocatalysis occurs during ORR at the Pt<SUB>3</SUB>Y alloy electrodes. ► The activity of the ORR is related to the d-band structures of the Pt<SUB>3</SUB>Y catalysts. ► Pt<SUB>3</SUB>Y nanocatalysts were synthesized by using a high pressure sputtering technique. ► The fuel cell performance of Pt<SUB>3</SUB>Y alloy nanocatalysts was improved dramatically.</P>
Magnetic Properties of Mn-Doped ZnO Films Prepared by Reactive Cosputtering
Sang Yoon Park,이영백,Jie Hoon Kang,Pill Jin Kim,김태희,Young Jun Yoo 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.3
Zn1¡xMnxO ¯lms with smooth surfaces were prepared Si(100) substrates by reactive cosputtering of high-purity Mn and ZnO targets in an oxygen ambient with partial pressures ranging from 2.2 £ 10¡7 to 1.2 £ 10¡5 Torr. The ¯lm deposited at an oxygen partial pressure of 2.2 £ 10¡7 Torr exhibited a ferromagnetic behavior with a Curie temperature above 350 K while the ¯lms for oxygen partial pressures higher than 1.2 £ 10¡6 Torr revealed nonmagnetic properties. Our results evidently show that the oxygen vacancy plays an important role in the magnetic ordering of Mn-doped ZnO ¯lm. Our experimental results show the possibility for applications of Mn-doped ZnO-based tunneling devices.