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Review Article : The effects of virtual reality-based physical therapy in stroke patients
( Char Yong Kim ),( Won Kyu Min ) 물리치료재활과학회 2013 Physical therapy rehabilitation science Vol.2 No.1
Objective: Final goal of nerve advancement therapy is to provide maximum ability to function independently in life to patients. This paper appraises and describes basic concepts of the virtual reality (VR) based exercise program to improve functional movement for neurologically impaired patients. Design: Review article. Methods: Stroke patients from the physical therapy department while wearing comfortable clothing receive therapy and also VR based motion therapy administered by the therapist in charge. After evaluation of stroke patients, therapy includes an exercise program that is suitable for use with stroke patients; stroke patients wear head-mounted display while in front of the computer, where the camera is located; they follow the action on the screen and the computer perceives the operation of the stroke patients according to subject accomplishment. Results: According to obstacle condition of stroke patients using the method, which is various environments after setting, in stroke patients, there is a possibility of presenting suitable therapeutic environments. The display presentation of the method, which is identical, causes difficulty for all stroke patients. According to subject accomplishment; stroke patients result in execution of repetition training and deepening study, which leads to mobility. Conclusions: The VR based rehabilitation training programs is a difference of the existing video training program, is immediate feedback and compensation method. It will provide rehabilitation training services for the family of the patient whose condition could be improved with rehabilitative therapy where it is a continuous circumstance as a matter of the social welfare facility therapy.
올레핀 촉진수송 분리막의 성능향상을 위한 Valine의 효과
Yong Soo Kang,Sang Wook Kang,Jong Hak Kim,Jongok Won,Kookheon Char 한국막학회 2003 멤브레인 Vol.13 No.2
은염이 함유된 고분자 전해질을 이용한 올리핀 촉진수송 분리막은 고체상에서 높은 올레핀/파라핀 분리 성능을 나타내었다 본 연구에서는, 프로필렌/프로판 분리 선택도와 투과도의 성능을 향상시키기 위해 아미노산의 일종인 valine을 고분자 전해질막에 첨가하였다. FT-lR 분광학을 통해 valine의 양이온과 은염의 음이온이 상호작용을 하고, 그 결과 valine은 은이온의 활성도를 증가시킴을 알 수 있었다. 따라서 valine을 포함하고 있는 촉진수송 분리막은 valine이 없을 때보다 더 높은 선택도와 투과도를 나타내었다. A remarkable separation performance of olefin/paraffin mixtures has been observed through facilitated olefin transport membranes consisting of silver ions dissolved in polymer matrices. In this research, valine, an amino acid, was introduced in poly (2-ethyl-2-oxazoline) (POZ)/AgBF4 membranes to increase the separation performance. FT-IR spectra show that the cationic sites (-NH3+) of valine interact with the counter anion of the silver salt, resulting in the enhanced activity of the silver ions and consequently improved separation perfornance. Therefore, the POZ/AgBF4 membranes containing valines exhibit the higher permeance as well as the higher selectivity of propylene/propane than those without valine.
Wooh, Sanghyuk,Kim, Tea-Yon,Song, Donghoon,Lee, Yong-Gun,Lee, Tae Kyung,Bergmann, Victor W.,Weber, Stefan A. L.,Bisquert, Juan,Kang, Yong Soo,Char, Kookheon American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.46
<P>Dye aggregation and electron recombination in TiO<SUB>2</SUB> photoanodes are the two major phenomena lowering the energy conversion efficiency of dye-sensitized solar cells (DSCs). Herein, we introduce a novel surface modification strategy of TiO<SUB>2</SUB> photoanodes by the fluorinated self-assembled monolayer (F-SAM) formation with 1<I>H</I>,1<I>H</I>,2<I>H</I>,2<I>H</I>-perfluorooctyltriethoxysilane (PFTS), blocking the vacant sites of the TiO<SUB>2</SUB> surface after dye adsorption. The F-SAM helps to efficiently lower the surface tension, resulting in efficient repelling ions, e.g., I<SUB>3</SUB><SUP>–</SUP>, in the electrolyte to decrease the electron recombination rate, and the role of F-SAM is characterized in detail by impedance spectroscopy using a diffusion–recombination model. In addition, the dye aggregates on the TiO<SUB>2</SUB> surface are relaxed by the F-SAM with large conformational perturbation (i.e., helix structure) seemingly because of steric hindrance developed during the SAM formation. Such multifunctional effects suppress the electron recombination as well as the intermolecular interactions of dye aggregates without the loss of adsorbed dyes, enhancing both the photocurrent density (11.9 → 13.5 mA cm<SUP>–2</SUP>) and open-circuit voltage (0.67 → 0.72 V). Moreover, the combined surface modification with the F-SAM and the classical coadsorbent further improves the photovoltaic performance in DSCs.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-46/acsami.5b07211/production/images/medium/am-2015-072114_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b07211'>ACS Electronic Supporting Info</A></P>
강용수(Kang, Yong-Soo),이용건(Lee, Yong-Gun),강문성(Kang, Moon-Sung),김종학(Kim, Jong-Hak),차국헌(Char, Kook-Chen) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
The solid state dye-sensitized saolrc cells (DSSCs) employing polymer electrolytes show high overall energy conversion efficiency as high as 4.5% at 1 sun conditions. The improved efficiency may be primarily due to the enlarged interfacial contact area between the electrolyte and dyes in addition to the increased ionic conductivity, which were done by utilizing liquid oligomers, followed by in situ self-solidification, to form the solid DSSCs Oligomer Approach. The effect of the charge transfer resistance at the counter electrode side on the effciency has also been investigated.
Kang, Sang-Wook,Char, Kook-Heon,Kim, Jong-Hak,Kang, Yong-Soo The Polymer Society of Korea 2007 Macromolecular Research Vol.15 No.2
The reduction behavior of silver ions to silver nanoparticles is an important topic in polymer/silver salt complex membranes to facilitate olefin transport, as this has a significant effect on the long-term performance stability of the membrane. In this study, the effects ofthe solvent type on the formation of silver nanoparticles, as well as the long-term membrane performance of a solid polymer/silver salt complex membrane were investigated. These effects were assessed for solid complexes of poly(N-vinyl pyrrolidone) $(PVP)/AgBF_4$, using either an ionic liquid (IL), acetonitrile (ACN) or water as the solvent for the membrane preparation. The membrane performance test showed that long-term stability was strongly dependent on the solvent type, which increased in the following order: IL > ACN >> water. The formation of silver nanoparticles was more favorable with the solvent type in the reverse order, as supported by UV-visible spectroscopy. The poor stability of the $(PVP)/AgBF_4$ membrane when water was used as the solvent might have been due to the small amount of water present in the silver-polymer complex membranes actively participating in the reduction reaction of the silver ions into silver nanoparticles. Conversely, the higher stability of the $(PVP)/AgBF_4$, membrane when an IL was used as the solvent was attributable to the cooperative coordination of silver ions with the IL, as well as with the polymer matrix, as confirmed by FTIR spectroscopy.
Hwang, Do Won,Kim, Han Young,Li, Fangyuan,Park, Ji Yong,Kim, Dohyun,Park, Jae Hyung,Han, Hwa Seung,Byun, Jung Woo,Lee, Yun-Sang,Jeong, Jae Min,Char, Kookheon,Lee, Dong Soo IPC Science and Technology Press 2017 Biomaterials Vol.121 No.-
<P><B>Abstract</B></P> <P>Oncogene-targeted nucleic acid therapy has been spotlighted as a new paradigm for cancer therapeutics. However, <I>in vivo</I> delivery issues and uncertainty of therapeutic antisense drug reactions remain critical hurdles for a successful targeted cancer therapy. In this study, we developed a fluorescence-switchable theranostic nanoplatform using hyaluronic acid (HA)-conjugated graphene oxide (GO), which is capable of both sensing oncogenic miR-21 and inhibiting its tumorigenicity simultaneously. Cy3-labeled antisense miR-21 peptide nucleic acid (PNA) probes loaded onto HA-GO (HGP21) specifically targeted CD44-positive MBA-MB231 cells and showed fluorescence recovery by interacting with endogenous miR-21 in the cytoplasm of the MBA-MB231 cells. Knockdown of endogenous miR-21 by HGP21 led to decreased proliferation and reduced migration of cancer cells, as well as the induction of apoptosis, with enhanced PTEN levels. Interestingly, <I>in vivo</I> fluorescence signals markedly recovered 3 h after the intravenous delivery of HGP21 and displayed signals more than 5-fold higher than those observed in the HGPscr-treated group of tumor-bearing mice. These findings demonstrate the possibility of using the HGP nanoplatform as a cancer theranostic tool in miRNA-targeted therapy.</P>