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Tatsuya Fujii,Seiji Ohtori,Koshi Takana,Sumihisa Orita,Gen Inoue,Nobuyasu Ochiai,Kazuki Kuniyoshi,Yasuchika Aoki,Tetsuhiro Ishikawa,Masayuki Miyagi,Hiroto Kamoda,Miyako Suzuki,Yoshihiro Sakuma,Gou Kub 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.5
Purpose: Opioids improve pain from knee and hip osteoarthritis (OA) and decreasethe functional impairment of patients. However, there is a possibility that opioids induce analgesia and suppress the physiological pain of OA in patients, thereby inducing the progression of OA changes in these patients. The purpose of the current study was to investigate the possibility of progressive changes in OA among patients using opioids. Materials and Methods: Two hundred knee or hip OA patients were evaluated in the current prospective, randomized, active-controlledstudy. Patients were randomized 1:1:1 into three parallel treatment groups: loxoprofen, tramadol/acetaminophen, and transdermal fentanyl groups. Medicationwas administered for 12 weeks. Pain scores and progressive OA changes on X-ray films were evaluated. Results: Overall, pain relief was obtained by all three groups. Most patients did not show progressive OA changes; however, 3 patients in the transdermal fentanyl group showed progressive OA changes during the 12 weeks of treatment. These 3 patients used significantly higher doses than others in the transdermal fentanyl group. Additionally, the average pain score for these 3 patientswas significantly lower than the average pain score for the other patients in the transdermal fentanyl group. Conclusion: Fentanyl may induce progressive changes in knee or hip OA during a relatively short period, compared with oral Non-Steroidal Anti-Inflammatory Drugs or tramadol.
Cathodic Reaction of Perovskite Oxide Electrodes on a Proton Conducting Electrolyte
Suzuki, Kota,Hashimoto, Shin-ichi,Yashiro, Keiji,Amezawa, Koji,Kawada, Tatsuya The Electrochemical Society 2013 ECS transactions Vol.57 No.1
<P>Cathodic reaction of protonic ceramic fuel cells (PCFCs) using SrZrO<SUB>3</SUB> based proton conducting electrolyte with perovskite oxide cathode is studied. A dense La<SUB>0.6</SUB>Sr<SUB>0.4</SUB>CoO<SUB>3</SUB> (LSC) film is fabricated on 10mol% Y-doped SrZrO<SUB>3</SUB> (SZY) electrolyte using pulsed laser deposition (PLD) method as a cathode. Cathodic performance of the dense LSC electrode is evaluated using AC impedance measurement and Secondary Ion Mass Spectroscopy (SIMS) analysis. Impedance spectra suggest that LSC dense film play a role as proton blocking electrode. SIMS analysis reveals that proton concentration in LSC dense film is higher than bulk of LSC, and there is no concentration gradient in LSC and SZY. Therefore, it is suggested that proton surface exchange rate of LSC is very low.</P>
Evaluation of dose effects of two types of tomotherapy couch and examination of its optimization
Suzuki Shunsuke,Inoue Tatsuya,Yamano Akihiro,Nagata Hironori 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.12
This study aims to evaluate the couch modeling accuracy of two types of TomoTherapy devices, namely Radixact and Hi-Art. First, we performed chamber measurement using A1SL and Cheese phantom for beams from the posterior direction to evaluate the couch modeling accuracy of the both tomotherapy units. Next, the couch model was corrected to achieve optimal dose delivery. Subsequently, patient dose verifcation for ten TomoDirect plans with only the posterior beams and ten TomoHelical plans was performed using Delta4. The gamma passing rate (γ-index) with 3 mm/3% and 2 mm/2% of Radixact (before and after couch correction modeling (CCM)) and Hi-Art (before and after CCM) were evaluated and statistically compared. Dose diferences between the measurement and calculation in Radixact ranged from−3.3% to 0%, whereas the dose diferences in Hi-Art ranged from−2.2% to 0.9%. Considerable diferences were observed in the γ-index of TomoDirect plans between Radixact before and after CCM (P<0.05) for both gamma criteria; however, these were not considerably diferent between Hi-Art before and after CCM. Moreover, no considerable diferences were noted in the γ-index of TomoHelical plans in both units. After optimizing the couch model, the γ-index for TomoDirect plans signifcantly improved for the patient dose verifcation of Radixact with Delta4. In addition, the γ-index for TomoDirect and TomoHelical plans for Hi-Art were improved after CCM despite no statistically signifcant diferences. These fndings can serve as a reference data when considering the efects of couch modeling on irradiation during TomoTherapy in clinical practice.
Tatsuya SAKURAI,Takeru SUZUKI,Misato YOSHIOKA 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.1
This study aims to evaluate the performance of the Air Quality Model (AQM) for the seasonal and spatial distribution of the NH3 concentration in the atmosphere. To obtain observational data for the model validation, observations based on biweekly sampling have been conducted using passive samplers since April 2015 at multiple monitoring sites in the Tokyo metropolitan area. AQM, built based on WRF/CMAQ, was applied to predict the NH3 concentration observed from April 2015 to March 2016. The simulation domain includes the Kanto region, which is the most densely populated area in Japan. Because the area also contains large amount of livestock, especially in its northern part, the density of the NH3 emissions derived from human activities and agriculture there are estimated to be the highest in Japan. In the model validation, the model overestimated the observed NH3 concentration in the summer season and underestimated it in the winter season. In particular, the overestimation in the summer was remarkable at a rural site (Komae) in Tokyo. It was found that the overestimation at Komae was caused by the transportation of NH3 emitted in the northern part of the Kanto region during the night. It is suggested that the emission input used in this study overestimated the NH3 emission from human sources around the Tokyo suburbs and agricultural sources in the northern part of the Kanto region in the summer season. In addition, the current emission inventories might overestimate the difference of the agricultural NH3 emissions among seasons. Because the overestimation of NH3 in the summer causes an overestimation of NO3 - in PM2.5 in the AQM simulation, further investigation is necessary for the seasonal variation in the NH3 emissions.
Optimization of TomoTherapy couch density in the RayStation treatment-planning system
Suzuki Shunsuke,Inoue Tatsuya,Yagihashi Takayuki,Nagata Hironori 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.83 No.12
The aim of this study is to establish the treatment couch model of TomoTherapy in a RayStation treatment-planning system. Point-dose measurements using a cylindrical solid phantom and ionizing chamber were performed to determine the optimal mass densities of the couch components by minimizing the discrepancy between the measured and calculated attenuations. To validate the efcacy of the determined mass densities, patient-specifc delivery quality assurance (DQA) of the TomoDirect plans for eight palliative spine radiotherapy (PSR), fve postmastectomy radiotherapy (PMRT), and TomoHelical plans for ten treatment sites were performed using an ionizing chamber, EBT3 flm, and Delta4 diode detector with the default couch model (DCM) and corrected couch model (CCM). The dose diferences and global gamma statistics at 3 mm/3% and at 2 mm/2% were evaluated and statistically compared between the DQA plans of DCM and CCM. When applying the default and optimal couch models for treatment planning, the mean dose diferences between the measured and calculated attenuations were − 4.8% and − 0.1%, respectively. In all DQA for PSR cases using the CCM, the dose diference and gamma statistics were statistically improved compared to those using the DCM (P<0.05). However, there was no signifcant diference in the dose diferences and gamma statistics between the PMRT and TomoHelical cases, except for the flm DQA for PMRT. The results demonstrated that the couch model in RayStation should be commissioned for TomoTherapy treatment planning when a greater dose contribution is expected from the posterior direction.
Tatsuya Fukushi,Hisashi Yamamoto,Atsushi Suzuki,Yasuhiro Tsujimura 대한산업공학회 2009 Industrial Engineeering & Management Systems Vol.8 No.1
We consider facility layout problems, where mn facility units are assigned into mn cells. These cells are arranged into a rectangular pattern with m rows and n columns. In order to solve this cell type facility layout problem, many approximation algorithms with improved local search methods were studied because it was quite difficult to find exact optimum of such problem in case of large size problem. In this paper, new algorithms based on Simulated Annealing (SA) method with two neighborhood generation methods are proposed. The new neighborhood generation method adopts the exchanging operation of facility units in accordance with adjacent preference. For evaluating the performance of the neighborhood generation method, three algorithms, previous SA algorithm with random 2-opt neighborhood generation method, the SA-based algorithm with the new neighborhood generation method (SA1) and the SA-based algorithm with probabilistic selection of random 2-opt and the new neighborhood generation method (SA2), are developed and compared by experiment of solving same example problem. In case of numeric examples with problem type 1 (the optimum layout is given), SA1 algorithm could find excellent layout than other algorithms. However, in case of problem type 2 (randomprepared and optimum-unknown problem), SA2 was excellent more than other algorithms.
Fukushi, Tatsuya,Yamamoto, Hisashi,Suzuki, Atsushi,Tsujimura, Yasuhiro Korean Institute of Industrial Engineers 2009 Industrial Engineeering & Management Systems Vol.8 No.1
We consider facility layout problems, where mn facility units are assigned into mn cells. These cells are arranged into a rectangular pattern with m rows and n columns. In order to solve this cell type facility layout problem, many approximation algorithms with improved local search methods were studied because it was quite difficult to find exact optimum of such problem in case of large size problem. In this paper, new algorithms based on Simulated Annealing (SA) method with two neighborhood generation methods are proposed. The new neighborhood generation method adopts the exchanging operation of facility units in accordance with adjacent preference. For evaluating the performance of the neighborhood generation method, three algorithms, previous SA algorithm with random 2-opt neighborhood generation method, the SA-based algorithm with the new neighborhood generation method (SA1) and the SA-based algorithm with probabilistic selection of random 2-opt and the new neighborhood generation method (SA2), are developed and compared by experiment of solving same example problem. In case of numeric examples with problem type 1 (the optimum layout is given), SA1 algorithm could find excellent layout than other algorithms. However, in case of problem type 2 (random-prepared and optimum-unknown problem), SA2 was excellent more than other algorithms.