http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Yuji Yamada,Yoshihiro Kai,Noriyuki Kida,Hitoshi Koda,Minoru Takeshima,Kenji Hoshi,Kazuyoshi Gamada,Toru Morihara 대한견주관절의학회 2022 대한견주관절의학회지 Vol.25 No.4
Background: Massive rotator cuff tears (MRCTs) with subscapularis (SSC) tears cause severe shoulder dysfunction. In the present study, the influence of SSC tears on three-dimensional (3D) shoulder kinematics during scapular plane abduction in patients with MRCTs was examined. Methods: This study included 15 patients who were divided into two groups: supraspinatus (SSP) and infraspinatus (ISP) tears with SSC tear (torn SSC group: 10 shoulders) or without SSC tear (intact SSC group: 5 shoulders). Single-plane fluoroscopic images during scapular plane elevation and computed tomography (CT)-derived 3D bone models were matched to the fluoroscopic images using two-dimensional (2D)/3D registration techniques. Changes in 3D kinematic results were compared. Results: The humeral head center at the beginning of arm elevation was significantly higher in the torn SSC group than in the intact SSC group (1.8±3.4 ㎜ vs. −1.1±1.6 ㎜, p<0.05). In the torn SSC group, the center of the humeral head migrated superiorly, then significantly downward at 60° arm elevation (p<0.05). In the intact SSC group, significant difference was not observed in the superior-inferior translation of the humeral head between the elevation angles. Conclusions: In cases of MRCTs with a torn SSC, the center of the humeral head showed a superior translation at the initial phase of scapular plane abduction followed by inferior translation. These findings indicate the SSC muscle plays an important role in determining the dynamic stability of the glenohumeral joint in a superior-inferior direction in patients with MRCTs.
Nakamae Toshio,Kamei Naosuke,Fujimoto Yoshinori,Yamada Kiyotaka,Tamura Takayuki,Tsuchikawa Yuji,Morisako Taiki,Harada Takahiro,Maruyama Toshiaki,Adachi Nobuo 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.2
Study Design: Cross-sectional study. Purpose: We aimed to quantitatively assess bone marrow edema (BME) on magnetic resonance imaging (MRI) for patients with degenerative lumbar diseases. Overview of Literature: BME adjacent to a sclerotic endplate of the lumbar spine, detected using T2-weighted fat-saturated MRI, is closely associated with low back pain in patients with degenerative lumbar diseases. However, currently, there no quantitative evaluation methods for BME adjacent to the vertebral endplate. Methods: Patients with degenerative lumbar diseases, whose MRIs detected BME, were enrolled. On a T2-weighted fat-saturated MRI, BME appeared as a high-intensity region adjacent to the vertebral endplate. We calculated the contrast ratios (CRs) of BME and normal bone marrow using the signal intensities of BME, normal bone marrow, and the spinal cord. On computed tomography, we calculated Hounsfield unit (HU) values in the same area as BME, the sclerotic endplate, and normal bone marrow to assess bone density. Results: There were 16 men and 14 women, with an average age of 73.5 years. The mean CRs of BME and normal bone marrow were −0.015±0.056 and −0.407±0.023, respectively. BME’s CR was significantly higher than that of normal bone marrow (p<0.01). The HU values in the same area as BME, the sclerotic endplate, and normal bone marrow were 251.9±24.6, 828.3±35.6, and 98.1±9.3, respectively; these values were significantly different from each other (p<0.01). Conclusions: The CR on MRI is a useful quantitative assessment tool for BME in patients with degenerative lumbar diseases.
Evaluation of operational characteristics of vertical type incinerator
( Kohei Yamanaka ),( In-hee Hwang ),( Takayuki Matsuo ),( Yasumasa Tojo ),( Toshihiko Matsuto ),( Yuji Yamada ),( Ryoji Sameshima ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Vertical type incinerator is one of unique incinerators. Wastes are fed at the hopper of upper side of reactor and slowly flow the bottom where the bottom ash is withdrawn. Combustion air less than theoretical one is injected through the bottom of furnace. In their downward movement, the wastes undergo the following process such as drying, pyrolysis, and combustion. Combustible gas that is generated in pyrolysis zone and moves to upward which is burned efficiently in the combustion chamber by supplying sufficient secondary combustion air. As advantages of vertical type incinerator, there are high responsiveness to diverse wastes, high combustion efficiency, and less generation of exhaust gas compared with a conventional stoker type incinerator. However, the utilization record of the vertical type incinerator is few, so there is not enough information to evaluate its operation performance from the engineering point of view. In this work, it aimed at elucidating the material and energy balance, combustion stability, and environmental safety for operating two vertical type incinerators. Annual discharge amounts of exhaust gas and ash, consumption amounts of fuel and electric power, and utilization amounts of chemicals such as slaked lime and activated carbon of per ton of waste were determined based on annual reports obtained from two facilities in Nagayo (54t/d) and Ito (42t/d) respectively. These values were compared with statistical data obtained from questionnaire survey on conventional incinerators performed in 2012 and 2015. For confirmation of combustion characteristics of waste in furnace, vertical distributions of gas concentration and total carbon in the waste layer were measured. To evaluate whether the waste incineration is done stable or not, continuous monitoring data of carbon monoxide concentration in flue gas was obtained. Moreover, bottom ashes were sampled for three days to measure ignition loss. On the other hand, daily average concentrations of harmful substances in exhaust gas such as NOx, SOx, CO, HCl, DXN at stack was also obtained. In the evaluation of discharge of exhaust gas and ash, consumption of fuel and electric power, and chemicals utilization, the surveyed two vertical incinerators showed above-average operational performance compared to conventional incinerators. From the variation of gas concentrations such as H<sub>2</sub>, CO, CO<sub>2</sub>, hydrocarbons in furnace, the vertical distribution of dry, pyrolysis, and char combustion zone was confirmed from the top to bottom of waste layer. Though it was found that 1 h moving average concentration of CO instantaneously sometimes exceeded 100 ppm in flue gas, its frequency was lower than that of conventional stoker type incinerator. However, there were relatively high Pb leaching samples in the leaching test of Pb and Cd of bottom ash. It is necessary to investigate whether it is the influence of the combustion characteristics of the vertical type incinerator.