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서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-
The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.
Yang, Jaemoon,Lee, Choong-Hwan,Ko, Hyun-Ju,Suh, Jin-Suck,Yoon, Ho-Geun,Lee, Kwangyeol,Huh, Yong-Min,Haam, Seungjoo WILEY-VCH Verlag 2007 Angewandte Chemie Vol.46 No.46
<B>Graphic Abstract</B> <P>Diagnosis and treatment all in one: Multifunctional magneto-polymeric nanohybrids (MMPNs) have been synthesized using ultrasensitive MnFe<SUB>2</SUB>O<SUB>4</SUB> nanocrystals, chemotherapeutic agents, and encapsulating amphiphilic block copolymers for targeted detection by MRI and treatment of breast cancer. See the TEM image (left) of an MMPN and T<SUB>2</SUB>-weighted MR images (top row) and color map (bottom row) of the relaxivity R<SUB>2</SUB> for NIH3T6.7 and MDA-MB-231 cells. <img src='wiley_img/14337851-2007-46-46-ANIE200703554-content.gif' alt='wiley_img/14337851-2007-46-46-ANIE200703554-content'> </P>
Yang Seung-Hyun,Jeong Kiyoung,Yang Jaemoon,Son Hye Young,Suh Jin-Suck,Huh Yong-Min,Oh Seung Jae 한국물리학회 2023 Current Applied Physics Vol.45 No.-
This study used magnetic resonance (MR) thermometry to investigate the temperature increases and thermal transfer that occur during plasmonic photothermal therapy (PTT) with gold nanorods (GNRs). An artificial tumor phantom made of agarose gel containing GNRs was heated by irradiation with an 808 nm laser. The MR thermometry visualized the conditions: a well-localized temperature distribution with suppressed thermal diffusion that depended on laser power and irradiation time. A tumor phantom model was implanted in mice, and MR thermometry evaluated the temperature change in the presence and absence of GNRs and the thermal transfer into the surrounding tissues. That experiment showed that MR thermometry can be a useful tool for monitoring PTT. These results suggest that MR temperature measurement could help to establish ideal laser irradiation conditions in GNR-mediated PTT, and that it has great potential for visualizing local photothermal induction and evaluating therapeutic effects.
Yang, Seung-Hyun,Heo, Dan,Park, Jinsung,Na, Sungsoo,Suh, Jin-Suck,Haam, Seungjoo,Wook Park, Sahng,Huh, Yong-Min,Yang, Jaemoon IOP Pub 2012 Nanotechnology Vol.23 No.50
<P>Amphiphilic surfactants have been used to disperse magnetic nanoparticles in biological media, because they exhibit a dual hydrophobic/hydrophilic affinity that facilitates the formation of a nanoemulsion, within which nanoparticle surfaces can be modified to achieve different physicochemical properties. For the investigation of the interactions of cells with charged magnetic nanoparticles in a biological medium, we selected the nanoemulsion method to prepare water-soluble magnetic nanoparticles using amphiphilic surfactant (polysorbate 80). The hydroxyl groups of polysorbate 80 were modified to carboxyl or amine groups. The chemical structures of carboxylated and aminated polysorbate 80 were confirmed, and water-soluble manganese ferrite nanoparticles (MFNPs) were synthesized with three types of polysorbate 80. Colloidal size, morphology, monodispersity, solubility and T2 relaxivity were found to be similar between the three types of MFNP. However, cationic MFNPs exhibited greater cytotoxicity in macrophages (RAW264.7 cells) and lower cellular membrane effective stiffness than anionic and non-ionic MFNPs. Moreover, cationic MFNPs exhibited large uptake efficiency for RAW264.7 cells compared with anionic or non-ionic MFNPs under the same conditions. Therefore, we propose that surface charge should be a key consideration factor in the design of magnetic nanoparticles for theragnostic applications. </P>
Yang, Jaemoon,Lee, Jaewon,Kang, Jinyoung,Oh, Seung Jae,Ko, Hyun-Ju,Son, Joo-Hiuk,Lee, Kwangyeol,Suh, Jin-Suck,Huh, Yong-Min,Haam, Seungjoo WILEY-VCH Verlag 2009 Advanced Materials Vol.21 No.43
<B>Graphic Abstract</B> <P>Near-infrared-light-sensitive multifunctional smart drug-loaded polymer gold nanoshells are fabricated as advanced prototypes, composed of chemotherapeutic agents (therapeutic antibody and anticancer drug-loaded polymeric nanoparticles) for systemic chemotherapy of human epithelial cancer and a polymer-based gold nanoshell for localized photothermal treatment by NIR light. <img src='wiley_img/09359648-2009-21-43-ADMA200900334-content.gif' alt='wiley_img/09359648-2009-21-43-ADMA200900334-content'> </P>
A Noncoherent UWB Communication System for Low Power Applications
Yang, Suck-Chel,Park, Jung-Wan,Moon, Yong,Lee, Won-Cheol,Shin, Yo-An The Institute of Electronics and Information Engin 2004 Journal of semiconductor technology and science Vol.4 No.3
In this paper, we propose a noncoherent On-Off Keying (OOK) Ultra Wide Band (UWB) system based on power detection with noise power calibration for low power applications. The proposed UWB system achieves good bit error rate performance which is favorably comparable to that of the system using the ideal adaptive threshold, while maintaining simple receiver structure, In addition, low power Analog Front-End (AFE) blocks for the proposed noncoherent UWB transceiver are proposed and verified using CMOS technology. Simulation results on the pulse generator, delay time generator and 1-bit Analog-to-Digital (AID) converter show feasibility of the proposed UWB AFE system.
Yang, Jaemoon,Cho, Eun-Jin,Seo, Sungbaek,Lee, Jae-Won,Yoon, Ho-Geun,Suh, Jin-Suck,Huh, Yong-Min,Haam, Seungjoo Wiley Publishers 2008 Journal of Biomedical Materials Research Part A Vol. No.
<P>Folate (FA) conjugated tri-block copolymers were prepared by bioconjugation of poly ϵ-caprolactonediol and various molecular weights of diamine polyethylene glycol. The synthetic tri-block copolymers were characterized by <SUP>1</SUP>H-NMR. Three types of nanoparticles were prepared by nanoprecipitation. Their size and morphology were verified by laser scattering and transmission electron microscopy, respectively. The colloidal stability of the nanoparticles was evaluated by turbidity test. The anticancer drug doxorubicin (DOX) was encapsulated in the nanoparticles during preparation. Drug loading amounts and release behavior from prepared nanoparticles were investigated. Fluorescent-activated cell sorting analysis and epi-fluorescencic microscopic imaging of prepared nanoparticles exhibited good cellular uptake against target cells. FA receptor expressed OVCAR3 cells that showed higher mean fluorescence intensity than FA receptor defect A549 cells at specific polyethylene glycol chain lengths. The cell cytotoxicity of prepared nanoparticles was evaluated for receptor mediated drug delivery. © 2007 Wiley Periodicals, Inc. J Biomed Mater Res, 2008</P>