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Prognostic significance of tumor laterality in advanced ovarian cancer
( Yuki Yamada ),( Seiji Mabuchi ),( Naoki Kawahara ),( Ryuji Kawaguchi ) 대한산부인과학회 2021 Obstetrics & Gynecology Science Vol.64 No.6
Objective This study aimed to investigate the effect of incorporating tumor laterality into the International Federation of Gynecology and Obstetrics (FIGO) staging system for advanced ovarian cancer. Methods The clinical data of 131 patients with advanced ovarian cancer treated between 2008 and 2018 were retrospectively reviewed. To investigate the prognostic significance of tumor laterality, we divided the patients into unilateral and bilateral groups. The prognostic significance of tumor laterality (bilateral vs. unilateral) was evaluated using univariate and multivariate analyses. The effect of incorporating tumor laterality into the FIGO staging system to predict survival outcomes was evaluated using the Kaplan-Meier method. Results Both overall survival (OS) and progression-free survival (PFS) were longer in the unilateral group than in the bilateral group. Multivariate analysis demonstrated that tumor laterality was an independent predictor of OS (hazard ratio, 1.75; confidence interval, 1.05-2.92; P=0.032). In patients with stage III disease, the bilateral group had a shorter OS than the unilateral group, but it was comparable to the OS in stage IV patients (P=0.354). The incorporation of tumor laterality into the FIGO staging system improved the stratification of survival probabilities. Conclusion Tumor laterality can be an independent prognostic factor in patients with advanced ovarian cancer. The incorporation of tumor laterality may improve the predictive performance of the FIGO staging system in patients with advanced ovarian cancer.
Yuki Kato,Joverienne Chavez,Shin Yamada,Soichi Hattori,Shuzo Takazawa,Hiroshi Ohuchi 대한슬관절학회 2019 대한슬관절학회지 Vol.31 No.2
Purpose: This study aimed to investigate anterior knee symptoms in patients who underwent anterior cruciate ligament (ACL) reconstruction using bonepatellar tendonbone (BPTB) graft followed by implantation of a betatricalcium phosphate (βTCP) block as a bone void filler.Materials and Methods: We retrospectively reviewed 84 cases of synthetic bone grafting using a βTCP block for the patellar bone defect in ACL reconstruction with a BPTB autograft. Computed tomography of the operated knee was performed immediately after the surgery to evaluate whether the grafted βTCP block protruded forward from the anterior surface of the patella. On the basis of the results, the cases were divided into a protrusion group (n=31) and a nonprotrusion group (n=53). Anterior knee symptoms at 12 months postoperatively and absorption of the grafted βTCP block were compared between the two groups.Results: Except for patellofemoral crepitus, there was no significant difference in anterior knee symptoms between the two groups (p>0.05). The incidence of patellofemoral crepitus was significantly lower in the protrusion group than in the nonprotrusion group (p=0.027). The groups showed no significant difference in βTCP absorption.Conclusions: The present study demonstrated that the protrusion of βTCP that was used as a bone void filler had no adverse effects.
Association between Pelvic Parameters and Vaginal Delivery
Yamada Tomohiro,Yamato Yu,Hasegawa Tomohiko,Yoshida Go,Yasuda Tatsuya,Banno Tomohiro,Arima Hideyuki,Oe Shin,Mihara Yuki,Ushirozako Hiroki,Ide Koichiro,Watanabe Yuh,Hosino Hironobu,Matsuyama Yukihiro 대한척추외과학회 2022 Asian Spine Journal Vol.16 No.2
Study Design: Cross-sectional study. Purpose: To investigate the association between vaginal delivery and pelvic parameters and clarify the effect of parity on parameter fluctuations. Overview of Literature: During vaginal delivery, the sacroiliac joint widens and the sacrum nutates (nods). However, the association between these pelvic parameters and parity is unknown. Methods: As part of a 2016 health screening, 320 female volunteers underwent whole-spine radiographs. Age-matched healthy women were grouped according to the number of vaginal deliveries (0, 1–2, or ≥3). Demographic variables and spinopelvic parameters were compared among the three groups. Results: Of the 320 volunteers, 213 were enrolled (mean age, 71.1±7.2 years). The mean number of vaginal deliveries was 2.2. The average pelvic incidence (PI) was 55.6°±11.1° and was significantly higher in the 90 women with three or more vaginal deliveries than in the other two groups (p<0.001). The average sacral slope was 33.4°±11.1° and was significantly higher in the women with three or more vaginal deliveries than in the 18 who did not deliver vaginally (p<0.001). The 105 women with one or two vaginal deliveries had significantly higher PIs and sacral slopes than did those who did not deliver vaginally (p<0.001). Conclusions: This is the first study documenting an association between vaginal delivery and pelvic parameters. Bony birth canal realignment during vaginal delivery can affect postnatal PI. Our study helps in understanding the PI changes over a woman’s life span.
Stability Control and Pattern Generation for Biped Humanoid Robot
Yuki Kamogawa,Kouhei Yamada,Hiroyuki Masuta,Hun-ok Lim 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper describes stability control for a biped humanoid robot. The stability control consists of ZMP compensation control and inverted pendulum control for the robot to walk stably on the ground. The ZMP compensation control compensates the displacement of the waist according to ZMP, and the inverted pendulum control accelerates ZMP to the falling direction of the robot. Also, a whole motion pattern generation based on the preview control is developed. It enables the robot to walk with arm swings. According to the walking parameters, the angles of the whole body are calculated by inverse kinematics. In order to verify the effectiveness of the pattern generation and the control method, the simulation of the whole body motion is conducted by using Adams and MATLAB/Simulink.
Hiroyuki Kamei,Yuki Homma,Ippei Takeuchi,Genta Hajitsu,Kaori Tozawa,Masakazu Hatano,Aiko Fukui,Manako Hanya,Shigeki Yamada,Nakao Iwata 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.1
Objective: To improve poor medication adherence in schizophrenic patients, long-acting injectable (LAI) antipsychotics are used. However, it has not yet become common in Japan. Recently, aripiprazole LAI was approved for alternative injection into the deltoid muscle in addition to the gluteal muscle. The acceptance for the proposal to switch from gluteal to deltoid injections of aripiprazole LAI was investigated. Methods: The subjects were 32 outpatients with schizophrenia who had continuously received aripiprazole LAI administration into the gluteal muscle for ≥ 6 months. In the patients who had continued deltoid injection for 3 months after switching, the changes in the pain and shame in comparison with gluteal injections were evaluated. Results: Switching to the deltoid injection was chosen by 17 out of 32 patients. Three months later, 9 patients were still receiving deltoid injections with highly rated satisfaction. The main reasons for switching to deltoid injections included the pain and shame associated with gluteal injections. The main reason for returning to the gluteal injection was the pain experienced from the injection in the deltoid. Conclusion: The option to select the injected area was based on the amount of pain in the deltoid and gluteal sites, leading to the widespread use of aripiprazole LAI.
Senya Kiyasu,Yuki Yamada,Sueharu Miyahara 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
We propose a semi-supervised method of land cover classification for remotely sensed multi spectral data. The method is usefule specially when the number of training data is small and restricted. The method derives the additional training data out of the object image by using the results of two different types of classifiers. We extract the pixels in which the results of two classifiers were coincide with each other and use the mas the additional training data in the classifiction. By the results of experiments, in which we used maximum like lihood method and A da Boost for the two classifiers, we confirmed that the algorithm is effective to improved the accuracy of classification.
Fatigue Strength Improvement of Welded Joints of Existing Steel Bridges by Shot-Peening
Koji Kinoshita,Yuki Banno,Yuki Ono,Shohey Yamada,Mitsuru Handa 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.2
Shot-peening recently can be applied to existing steel bridges due to the development of new vacuuming techniques of shots after peening in the construction site. This study experimentally investigates eff ects of fatigue strength improvement of shot-peening on welded joints. Bending fatigue tests using out-of-plane gusset welded joints specimens were carried out and three type specimens were compared: as-welded, grit-blasted, and shot-peened. In addition, this paper examines diff erences of fatigue strength improvement eff ects in case of applying shot-peening to inside of scallop where shots might be diffi cult to hit perpendicularly to weld toe of welded joints because of narrow space, and the residual stress measurement in order to clarify introducing compressive residual stress were carried out. As a result, it may be concluded that shot-peening can improve fatigue strength of welded joints and its mechanism was identifi ed as extension of crack initiation life and delay crack propagation due to benefi cial compressive residual stress in the vicinity of surface layer.
Koji Kinoshita,Yuki Banno,Yuki Ono,Shohey Yamada,Mitsuru Handa 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.3
This study experimentally investigates eff ect of fatigue strength improvement of the Portable Pneumatic Needle-Peening treatment (PPP treatment) as a needle peening on out-of-plane gusset welded joints by using plate bending fatigue tests. This study also examined eff ect of the travel speed and the number of treatment passes of the PPP treatment with regards to its fatigue strength improvement. After the fatigue tests, the observation of the fracture surface with Scanning Electron Microscope was carried out in order to clarify the crack initiation. From those test results, it may be concluded that the eff ect of fatigue strength improvement might be governed by treatment passes with suffi cient travel speed. In addition, this study carried out additional fatigue tests that focus on fatigue crack closer by using the PPP treatment. As a result of additional fatigue tests for fatigue crack closure, it might be said that the eff ect of fatigue crack closure is eff ective when the distance between fatigue cracks and treatment area is less than 2.0 mm.