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Effect of Patellar Taping on Quadriceps Muscle of Knee Joint
Sung Eun Lee,Shin Gyun Kim,Sung Hyoun Cho,Yoo Rim Choi,Chang Sook Kim,Sung Joon Kim,Ki San Nam,Gyung Kim 국제물리치료학회 2012 Journal of International Academy of Physical Ther Vol.3 No.1
This study aims to examine the effect of patellar taping common to patients with patellofemoral pain syndrome on the change of knee joint location. The total number of participants is 12 patients with no pain in their knee. There are three different experiments: no-taping, placebo taping, and patellar taping. After application, they squat on their hams. As a result, both the muscle activity of vastus medialis and that of vastus lateralis increased in placebo taping compared to no-taping, which wasn't statistically significant. However, the muscle activity of vastus medialis and that of vastus lateralis decreased in patellar taping compared to no-taping, which was statistically significant. This suggests that patellar taping causing the lateral attraction of knee joint is more influential to the dynamics of knee joint than skin afferent input in placebo taping. Therefore, patellar taping is effective to change the location of knee joint, affect the muscle activity of quadriceps muscle of thigh, and thus correct the misalignments of the knee joint.
A VR/AR Interface Design based on Unaligned Hand Position and Gaze Direction
Joon Young Ahn,Sang Yoon Han,Junho Jo,Sang Hwa Lee,Nam Ik Cho 대한전자공학회 2020 IEIE Transactions on Smart Processing & Computing Vol.9 No.2
In conventional natural user interface schemes that use hand gestures without holding a sensor device, users usually need to hold up their hands to align them to the gaze direction where the (virtual) object is displayed. Also, users need to move their hands in the designated space for quite a long time, which may cause fatigue and decrease the performance of gesture recognition. Hence, we propose a new interface scheme that alleviates this problem by freeing the hand position from the gaze direction such that users can even put their hands on a desk. For this, we need to have more robust hand detection and an effective gesture recognition scheme, because the hands can be placed anywhere in the space, and hand motion is not calibrated to the virtual space. For robust hand detection, we propose an algorithm based on a new hand pose model, which is implemented using a wide-angle camera. For efficient gaze calibration and tracking, we use a three-dimensional eyeball model from our previous work. Because the gaze and hand motion/positions are not aligned, we designed a finite state machine for robust gesture flow. Based on this scheme, we defined six interactive interfaces for the target object: click, double click, drag and drop, zoom in, zoom out, and return home. More complicated interactions can be implemented based on these six basic interfaces. The proposed interface scheme is implemented on a handheld mobile device, which is shown to work robustly for a wide range of hand positions.
Predictive factors of acute kidney injury in patients undergoing rectal surgery
( Sung Yoon Lim ),( Joon Yong Lee ),( Ji Hyun Yang ),( Young Joo Na ),( Myung Gyu Kim ),( Sang Kyung Jo ),( Won Yong Cho ) 대한신장학회 2016 Kidney Research and Clinical Practice Vol.35 No.3
Background: Despite major advance in surgical techniques from open surgery to robot-assisted surgery, acute kidney injury (AKI) is still major postoperative complication in rectal surgery. The purpose of this study is to compare the incidence of postoperative AKI according to different surgical techniques and also the risk factors, outcomes of AKI in patients undergoing rectal cancer surgery. Methods: A retrospective medical chart review was done in a total of 288 patients who received proctectomy because of rectal cancer from 2011 to 2013. Results: The mean patient age was 62 ± 12 years, and male was 64.2%. Preoperative creatinine was 0.91 ± 0.18 mg/dL. Open surgery was performed in 9%, and laparoscopy assisted surgery or robot assisted surgery were performed in 54.8% or 36.1% of patients, respectively. AKI developed in 11 patients (3.82%), 2 (18%) of them received acute hemodialysis. Incidence of AKI was not different according to the surgical technique, however, the presence of diabetes, intraoperative shock, and postoperative ileus was associated with the development of AKI. In addition, AKI patients showed significantly longer hospital stay and higher mortality than non- AKI patients. Conclusion: Our study demonstrated that despite advances in surgical techniques, incidence of postoperative AKI remains unchanged and also that postoperative AKI is associated with poor outcome. We also found that presence of diabetes, intraoperative shock and postoperative ileus are strongly associated with the development of AKI. More careful attention should be paid on high risk patients for the development of postoperative AKI regardless of surgical techniques.
Sang Mi Jeon,Young Hee Lee,Hyeong Joon Ji,Hye Joung Cho,Seo Jin Kim,Hye Eun Kim,SUN QIAOCHU,Kyu Hyeon Ahn,Hong Ran Choi,Ok Joon Kim 대한구강악안면병리학회 2016 대한구강악안면병리학회지 Vol.40 No.4
Composite resins are developed as restorative materials to improve esthetics and mechanical properties. To improve the physical properties of resin material, resin filler have to be added. However, no imaging method is adopted for resin filler distribution. Optical coherence tomography (OCT) is a optical imaging technique to delineate microscopic structures within biological tissue. The OCT application to dental composites resin and its filler is not described yet. So, this new and advanced optical method is needed for clinical application for evaluation of dental composite resin. To analyze the spatial distribution of dental composite resin and to evaluate the resin restoration in cavity, frequency domain optical coherence tomography (FD-OCT) was used for their analysis. Resin restored tooth was prepared. For morphological observation, serially sectioned teeth, conventional X-ray taking and micro computed-tomography (CT) images were compared with OCT images. The experiment has done to evaluate the success of the resin restoration using 3 dimensional structure OCT image. In this research, OCT is evaluated as a new technique to image resin restoration. The evaluation of resin restored tooth was performed by OCT. Inappropriate restoration such as marginal adaptation, large porosities, internal integrity and poor contour could be detected. Resin filler also could be checked by OCT. The distribution, number, regularity and size of resin filler can be differentiated from several commercial products. Considering the characteristics of the OCT, it can be used to evaluate the defects of resin restoration, resin filler distribution, and internal integrity between resin material and tooth structure. The OCT can be considered to be a new and advanced method for the evaluation of resin restorations.
Thermorheologic Properties of Aqueous Solutions and Gels of Poloxamer 407
Cho, Cheong Weon,Shin, Sang Chul,Oh, In Joon 전남대학교 약품개발연구소 1997 약품개발연구지 Vol.6 No.1
A rheological study of poloxamer 407 aqueous solution of 10-25% (w/w) concentrations was carried out at temperatures ranging from 27℃ to 45℃ and at various shear rates. An exponential relationship was found between viscosity and temperature, with curve slopes dependant upon poloxamer concentration. The viscosity of 25% poloxamer 407 aqueous solution showed a Newtonian fluid at 4℃ and linearly increased on increasing temperature. The viscosity of 25% poloxamer 407 aqueous solution was sharply increased at about 72℃ and maintained highly constant. During such a desolvation process, the closer approach of polymer chains, which gave rise to an increase in the number of interactions among the chains, gave an increase in the solution viscosity with temperature. The gelling concentration was examined using an interfacial tensiometer. The results showed that the first inflection point appeared at the 0.003% (w/w) concentration and the second point appeared at the 17.5% (w/w) concentration. It implied that poloxamer solutions formed monomolecular micelles at low concentration; as the concentration was increased, multimolecular aggregates were formed.
포스터전시 : 자발성 진균성 복막염의 임상 양상 분석: 자발성 세균성 복막염과의 비교 (초)
( Sang Youn Hwang ),( Jeong Hoon Lee ),( Eun Ju Cho ),( Min Sun Kwak ),( Eun Sun Jang ),( Joon Suk Kim ),( Su Jong You ),( Yoon Jun Kim ),( Jung Hwan Yoon ),( Eui Chong Kim ),( Hyo Suk Lee ) 대한간학회 2010 Clinical and Molecular Hepatology(대한간학회지) Vol.16 No.3(S)
Sung, Je-Hong,Lee, Joon-Hyung,Kim, Jeong-Joo,Lee, Hee-Young,Cho, Sang-Hee The Korean Ceramic Society 2003 한국세라믹학회지 Vol.40 No.4
The phase development process of $Ba_2$ $Ti_{9}$ $O_{20}$ ceramics is not clearly known and frequently accompanies second phases which deteriorate dielectric properties. In synthesizing $Ba_2$ $Ti_{9}$ $O_{20}$ ceramics, in order to trace the reaction sequence during conventional solid-state reaction in BaO-Ti $O_2$ system, different barium sources of BaC0$_3$ and BaTi0$_3$ precursor were used as starting materials. From the analysis of XRD patterns, different secondary phases could be identified depending on the barium source used, which might mean that the equilibrium phases in BaO-Ti $O_2$ system are very difficult to be synthesized. Because the BaTi0$_3$ precursor provides short diffusion paths of ions, the system revealed less secondary phases during solid state reaction. In synthesizing BaO-xSm$_2$0$_3$-4.5Ti0$_2$ system using different barium sources, different secondary phases were developed also. Microstructure and dielectric properties were examined and discussed in terms of secondary phase development.
Cho, Il-Hoon,Park, Guen-Il,Kim, Joon-Hyung,Hwang, Taek-Sung,Lee, Mi-Kyoung 한국탄소학회 2001 Carbon Letters Vol.2 No.2
The advanced method for $CO_2$capture is currently one of the most important environmental issues in worldwide and it is therefore necessary to have available technologies, which minimize the discharge of $CO_2$ including Carbon-14 from nuclear facilities into the atmosphere. A key aspect of this work is to provide the technically principal data required to improve a $CO_2$ removal system for the utilization of regenerative sorbent use, specifically include suggestions regarding its modified column design (parallel dual-bed assembly), stop-restart operation and the economic feasibility of sorbent use. The removal performance of soda lime and the effects of relative humidity (RH) and packing bed-depth (BD) on $CO_2$ removal were investigated. In a single-bed, it revealed that the utilization of soda lime for $CO_2$ removal at line velocity of 13 cm/sec and bed depth of 12 cm increased with the increased relative humidity up to 85%. However, in the parallel dual-bed assembly applied with the stop-restart operation, a maximum utilization rate of soda lime for $CO_2$ removal was obtained even at 55% of RH and 8 cm of BD, specifically the utilization rate of soda lime by using this $CO_2$ removal assembly was about two-fold superior to that in a single-bed.