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자유형 수영 경기에서 유형별 킥 동작에 따른 출발구간 기록의 비교
김동기,홍관이 江原大學校 附設 體育科學硏究所 1998 江原大學校附設體育科學硏究所論文集 Vol.- No.22
The purpose of this study was to compare starting section records by kick action of different type on crawl swimming. The results were summarized as follows: (1) For elementary school. male swimmers had no difference of records both Dolphin Kick and Beat Kick. but female swimmers had a little superior on records with Dolphin Kick. It was showed that there was possibility to apply Dolphin Kick (2)For middle school. male swimmers had more superiority with Dolphin Kick than Beat Kick. The frequency of Dolphin Kick is three times enough. Statistically. Dolphin Kick was superiority more or less (3)For high school. male swimmers had more superiority with Dolphin Kick than Beat Kick. Dolphin Kick is five times enough. Female swimmers had also more superiority with Dolphin Kick than Beat Kick
이재형 ( Jae Hyoung Yi1 ),허남기 ( Nam Kee Heo ),최병곤 ( Byung Gon Choi ),박은희 ( Eun Hee Park ),권세영 ( Se Young Kwun ),김명동 ( Myoung Dong Kim ),홍운표 ( Wun Pyo Hong ),여수환 ( Soo Hwan Yeo ),백성열 ( Seong Yeol Baek ) 한국미생물생명공학회(구 한국산업미생물학회) 2014 한국미생물·생명공학회지 Vol.42 No.2
본 연구에서는 강원전통장류로부터 혈전용해 활성이 우수한 효모를 분리하였다. 된장에서 분리한 AFY-1 균주는 혈전용해 활성 측정결과 양성대조구인 plasmin 보다 약 1.75배 높은 활성을 나타내었다. 분리한 효모는 18S rRNA 염기서열 및 탄소원 이용 특성 분석을 통하여 Saccharomycetales sp.로동정되었으며, AFY-1 균주의 생육 최적온도는 32oC였다. 본 연구에서 분리된 혈전용해능이 우수한 효모균주는 안전성 검증 등 추가연구를 통해 발효식품 제조용 스타터로서 활용이 가능할 것으로 기대된다. Yeast strains demonstrating fibrinolytic activity were isolated from traditional fermented soybean in Gangwon province, Korea. The AFY-1 strain isolated from fermented soybean paste showed the highest fibrinolytic activity (3.5 U/mg protein) corresponding to a 1.75 fold higher fibrinolytic activity compared with the plasmin (2.0 U/mg protein). The optimum temperature for the growth of AFY-1 strain was 32oC. Analysis of 18S rRNA gene sequence and carbon source utilization pattern indicated that the AFY-1 strain shares the highest homology (99%) with Saccharomycetales sp.
Wavy polymer thin film fabrication using sintered monolayered colloids.
Yi, Dong Kee,Paik, Ungyu American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.8
<P>Thin films of polystyrene were prepared onto flexible prestrained substrates using a convective colloidal assembly in monolayer fashion followed by thermal annealing at 150, and 160 degrees C. The prestrained substrate was under a tensile stress which was subsequently released resulting in wavy polymer thin films. By controlling the prestrain, the released stress was varied and the geometry of the resulting wavy patterns was tuned. Wavelength and amplitude values showed strong correlation with theoretical expectations. In addition to the uniaxial mechanical strain, thermal strain was also present in the experimental conditions; however, the resulting wavy patterns show no evidence of being affected by the isotropic thermal strain in our experimental model.</P>
Recent progress in nanotechnology for stem cell differentiation, labeling, tracking and therapy
Yi, Dong Kee,Nanda, Sitansu Sekhar,Kim, Kwangmeyung,Tamil Selvan, Subramanian Royal Society of Chemistry 2017 Journal of Materials Chemistry B Vol. No.
<P>Stem cells offer great potential for regenerative medicine due to their excellent capability to differentiate into a specialized cell type of the human body. Recently, nanomaterial based scaffolds (<I>e.g.</I> graphene), biodegradable polymers (<I>e.g.</I> PLGA: poly-d,l-lactic-<I>co</I>-glycolic acid), and inorganic nanoparticles (NPs, <I>e.g.</I> metallic, magnetic, upconversion) have made considerable advances in controlling the differentiation of stem cells. Some of the notable advances include the development of a variety of NPs such as gold, silica, selenium and graphene quantum dots (QDs) for the controlled differentiation of stem cells - human mesenchymal stem cells (hMSCs), and magnetic core-shell NPs (<I>e.g.</I> ZnFe2O4-Au) for the control of neural stem cells (NSCs). Multimodal imaging (MR, optical, ultrasound, photoacoustic) of stem cells provides opportunities for probing the fate of implanted cells, thereby determining the therapeutic efficacy. Novel multifunctional NPs have been developed over the years, and probed using the aforementioned imaging techniques for stem cell research. This review article underscores the recent progress in nanotechnology for stem cell differentiation, labeling, tracking and therapy. Nano/biomaterial assisted stem cell therapies for bone, heart, and liver regeneration are also delineated.</P>
Vertical Pillar-Superlattice Array and Graphene Hybrid Light Emitting Diodes
Lee, Jung Min,Choung, Jae Woong,Yi, Jaeseok,Lee, Dong Hyun,Samal, Monica,Yi, Dong Kee,Lee, Chul-Ho,Yi, Gyu-Chul,Paik, Ungyu,Rogers, John A.,Park, Won Il American Chemical Society 2010 NANO LETTERS Vol.10 No.8
<P>We report a type of device that combines vertical arrays of one-dimensional (1D) pillar-superlattice (PSL) structures with 2D graphene sheets to yield a class of light emitting diode (LED) with interesting mechanical, optical, and electrical characteristics. In this application, graphene sheets coated with very thin metal layers exhibit good mechanical and electrical properties and an ability to mount, in a freely suspended configuration, on the PSL arrays as a top window electrode. Optical characterization demonstrates that graphene exhibits excellent optical transparency even after deposition of the thin metal films. Thermal annealing of the graphene/metal (Gr/M) contact to the GaAs decreases the contact resistance, to provide enhanced carrier injection. The resulting PSL-Gr/M LEDs exhibit bright light emission over large areas. The result suggests the utility of graphene-based materials as electrodes in devices with unusual, nonplanar 3D architectures.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-8/nl100648y/production/images/medium/nl-2010-00648y_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl100648y'>ACS Electronic Supporting Info</A></P>
Yi, Won-Jae,Lee, Jung-Ho,Lee, Hyuk-Gee,Ryu, Kee-Young,Kang, Dong-Gee,Kim, Sang-Chul The Korean Neurosurgical Society 2007 Journal of Korean neurosurgical society Vol.42 No.2
Objective : Kyphoplasty and vertebroplasty are two minimally invasive procedures for osteoporotic vertebral compression fractures. The purpose of this retrospective study was to compare the radiological findings and clinical outcomes between two procedures. Methods : Osteoporotic vertebral fractures were treated in 76 vertebrae, using kyphoplasty (n=35 vertebrae) and using vertebroplasty (n=41 vertebrae). Fractured vertebral bodies were diagnosed by correlating the clinical symptoms with radiologic study. The responses of pain symptoms were measured by a self-reported Visual Analog Scale (VAS) score. Plain X-rays were checked preoperatively and postoperatively at admission and 6 months. The vertebral body height and kyphotic angle were measured to assess the reduction of the sagittal alignment. Results : The mean pain scores were decreased significantly for both procedures postoperatively, but there were no significant differences between two groups. Kyphoplasty led to a significant reduction of the vertebral body height and improvement of kyphotic angle. There were no neurological deficits after kyphoplasty, but one patient experienced paraparesis after vertebroplasty. During the 6 months follow-up both procedures provided stabilization of the sagittal alignment. Conclusion : Kyphoplasty and vertebroplasty are considered effective minimally invasive techniques for the stabilization of osteoporotic vertebral body fractures, leading to a statistically significant reduction in pain. Kyphoplasty significantly restore sagittal alignment. Also, complications and the incidence of bone cement leakage are significantly lesser than vertebroplasty. Therefore, kyphoplasty seems to be reasonable procedure for osteoporotic vertebral body compression fractures when medical treatment fail.
Nonalcoholic Fatty Liver Disease and Progression of Coronary Artery Calcification: A Cohort Study
( Dong Hyun Sinn ),( Danbee Kang ),( Yoosoo Chang ),( Seungho Ryu ),( Seonhye Gu ),( Hyunkyoung Kim ),( Donghyeong Seong ),( Soo Jin Cho ),( Byoung-kee Yi ),( Hyung-doo Park ),( Seung Woon Paik ),( Yo 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Nonalcoholic fatty liver disease (NAFLD), a hepatic manifestationof the metabolic syndrome, was associated with subclinical atherosclerosis atherosclerosisin many crosssectional studies, but the prospective associationbetween NAFLD and the progression of atherosclerosis has not beenevaluated. This study was conducted to evaluate the association betweenNAFLD and the progression of coronary atherosclerosis.Methods: This cohort study included 4,731 adult men and womenwith no history of CVD, liver disease or cancer at baseline who participatedin a repeated regular health screening exam between 2004and 2013. Fatty liver was diagnosed by ultrasound based on standardcriteria, including parenchymal brightness, liver-to-kidney contrast,deep beam attenuation and bright vessel walls. Progression of coronaryartery calcium (CAC) scores was measured using multidetectorCT scanners.Results: The annual rate of CAC progression in participants with andwithout NAFLD were 22% (95% confidence interval 20 - 23%) and17% (16 - 18%), respectively (p<0.001). The multivariable ratio ofprogression rates comparing participants with NAFLD to those withoutNAFLD was 1.04 (1.02 - 1.05; p<0.001). The association betweenNAFLD and CAC progression was similar in most subgroups analyzed,including in participants with CAC 0 and in those with CAC > 0at baseline.Conclusions: In this large cohort study of adult men and womenwith no history of CVD, NAFLD was significantly associated with thedevelopment of CAC independently of cardiovascular and metabolicrisk factors. NAFLD may play a pathophysiologic role in atherosclerosisdevelopment and may be useful to identify subjects with a higherrisk of subclinical disease progression.