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Iwatsuki, Keiji,Ohtsuka, Mikio,Matsui, Takashi,Yamamoto, Takenobu,Fujii, Kazuyasu,Yamasaki, Osamu,Tsuji, Kazuhide Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Erythrodermic actinic reticuloid (EAR) is a photosensitive disorder characterized by dense lymphocytic infiltration in the sun-exposed areas and an increased number of atypical lymphocytes in the peripheral blood. We have reported 2 patients with EAR with circulating atypical lymphocytes and photosensitivity to both ultraviolet (UV) B and A. Although no clonal proliferation of T-cells was observed in the peripheral blood, CD8+ cells were increased in number in an oligoclonal fashion. A number of proliferating CD8+ cells were small, but most cells expressed bcl-2. These findings suggest EAR is a photosensitivity dermatitis characterized by the overspill of oligoclonal CD8+ lymphocytes responsive to UV irradiation.
Relationships among Movement Reinvestment, Decision-Making Reinvestment, and Perceived Choking
Takehiro Iwatsuki,Perry Wright 한국코칭능력개발원 2016 International Journal of Coaching Science Vol.10 No.1
The purpose of this research was to examine the relationships among movement reinvestment, decision-making reinvestment, and perception of choking under pressure with individual and team sport athletes. Participants were 84 male varsity collegiate athletes on tennis, squash, soccer, volleyball, and basketball teams from the NCAA Division III in the United States. Participants completed the Movement Specific Reinvestment Scale (MSRS; Masters, Evans, & Maxwell, 2005), the Decision Specific Reinvestment Scale (DSRS; Kinrade, Jackson, Ashford, & Bishop, 2010a), and perception of choking under pressure. Results indicated that movement self-consciousness predicted athletes’ perception of choking under pressure. Results of MANOVA revealed that individual sport athletes had higher perception of choking under pressure than team sport athletes. Movement reinvestment and decision-making reinvestment may serve an important role in the choking under pressure process.
Nobuyuki Iwatsuki,Takanori Kotte,Koichi Morikawa 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
This paper describes the position and stiffness control of planar redundant link mechanisms with elastic elements in order to utilize the flexibility of robots. Assigning both of the two-dimensional position and stiffness of an output link as an output vector, the procedure of the forward kineto-static analysis for the planar redundant link mechanisms with elastic elements is formulated. The mechanisms have elastic linearactuators composed of a coil spring and linearactuator and rotary actuators and multi jointed links. An inverse kineto-static analysis to obtain the optimum input motions which can generate the desired position and stiffness of the output link while taking into account the motion range of the linearactuator is also conducted and applied to the optimum motion control of the mechanism. Several simulations and experiments with a prototype of a planar closed-loop manipulator with 5 DOF and 4 output show the effectiveness of the proposed method.
단세포 나팔벌레,Stentor coeruleus의 빛에 의한 ATP 합성
Chen, B.H.,허재욱,민태진,Iwatsuki, K,송필순 동국대학교 자연과학연구소 1986 자연과학연구 논문집 Vol.6 No.-
나팔벌레의 세포내 ATP 함량은 0.5~2초동안 40W/m₂백색광을 조사함에 따라 어두운 상태의 대조구에 비하여 급격히 증가하였고, 빛을 계속하여 조사하면 세포내 ATP 함량은 단계적으로 감소하였다. 광수용체 색소 Stentorin 을 포함하고 있는 색소 미립자를 나팔벌레 완전세포로부터 분리하여 이에 ADP와 pi를 가한 혼합물에 빛을 조사하여 ATP가 생성됨을 확인하였다. 나팔벌레 완전세포와 색소미립자주으이 ATP 함량은 변량울에 (fluence rate)의존하였다. 이들 결과로 생명체는 광양자를 ATP로 전이시킬 수 있고, ATP 생성은 나팔벌레 색소미립자의 특성으로 사려된다. The cellular ATP level in Stentor coeruleus jumped above the dark control level when stimulated by 0.5-2 second light pulses (40W/m₂white light). Continued, irradiation fo the cells caused a gradual decline of the cellular ATP level. Pigment granules containing the photoreceptor pigment stentorin isolated from whole cells also exhibited a light-induced ATP synthesis. The ATP level in both whole cells and pigment granules was dependent upon the fluence rate. These results suggest that the organism is capable of tranducing light quanta into ATP and that ATP synthesis is localized in the pigment granule.
Koshi Ninomiya,Koichi Iwatsuki,Yu-Ichiro Ohnishi,Toshika Ohkawa,Toshiki Yoshimine 대한척추외과학회 2015 Asian Spine Journal Vol.9 No.6
Study Design: Retrospective study. Purpose: To evaluate the initial fixation using the cortical bone trajectory (CBT) technique for posterior lumbar fusion through assessment of the clear zones around the screws and the risk factors involved. Overview of Literature: Postoperative radiolucent zones (clear zones) are an indicator of poor conventional pedicle screw fixation. Methods: Between January 2013 and April 2014, 19 patients (8 men and 11 women) underwent posterior lumbar interbody fusion or posterior lumbar fusion using the CBT technique. A total of 109 screws were used for evaluation with measurement of the maximum insertional torque of last two screw rotations. Clear zone-positivity on plain radiographs was investigated 6 months after surgery. The relation between intraoperative insertional torque and clear zone-positivity was investigated by one-way analysis of variance. In addition, the correlation between clear zone-positivity and gender, age (<75 years old or >75 years old), or operative stabilization level (<2 or >3 vertebral levels) was evaluated using the chi-square test. Results: Clear zones were observed around six screws (5.50%) in five patients (26.3%). The mean insertional torque (4.00±2.09 inlbs) of clear zone-positive screws was lower than that of clear zone-negative screws (8.12±0.50 in-lbs), but the difference was not significant. There was a significant correlation between clear zone-positivity and operative level of stabilization. Conclusions: The low incidence of clear zone-positive screws indicates good initial fixation using the CBT technique. Multilevel fusions may be risk factors for clear zone generation.
Koshi Ninomiya,Koichi Iwatsuki,Yu-Ichiro Ohnishi,Toshika Ohkawa,Toshiki Yoshimine 대한척추외과학회 2016 Asian Spine Journal Vol.10 No.5
Study Design: Retrospective study. Purpose: Cortical bone trajectory (CBT), a more medial-to-lateral and shorter path than the traditional one for spinal fusion, is thought to be effective for severely degenerated vertebrae because screws are primarily stabilized at the posterior elements. We evaluated the efficacy of this approach through in vivo insertional torque measurement. Overview of Literature: There has been only one prior in vivo study on CBT insertional torque. Methods: Between January 2013 and April 2014, a total of 22 patients underwent posterior lumbar fusion using the CBT technique. The maximum insertional torque, which covers the radial strength needed for insertion, was measured for 113 screws, 8 of which were inserted for L5 spondylolysis. The insertional torque for cases with (n=8) and without (n=31) spondylolysis of L5 were compared using one-way analysis of variance (ANOVA). To evaluate vertebral degeneration, we classified 53 vertebrae without spondylolysis by lumbar radiography using semiquantitative methods; the insertional torque for the 105 screws used was compared on the basis of this classification. Additionally, differences in insertional torque among cases grouped by age, sex, and lumbar level were evaluated for these 105 screws using ANOVA and the Tukey test. Results: The mean insertional torque was significantly lower for patients with spondylolysis than for those without spondylolysis (4.25 vs. 8.24 in-lb). There were no statistical differences in insertional torque according to vertebral grading or level. The only significant difference in insertional torque between age and sex groups was in men <75 years and women ≥75 years (10 vs. 5.5 in-lb). Conclusions: Although CBT should be used with great caution in patient with lysis who are ≥75 years, it is well suited for dealing with severely degenerated vertebrae because the pars interarticularis plays a very important role in the implementation of this technique.