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Hiroyuki Sugiyama,Kohei Araki,Yoshihiro Suda 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
An on-line and off-line hybrid contact algorithm for modeling wheel/rail contact problems is developed based on the elastic contact formulation. In the hybrid algorithm developed in this investigation, the off-line tabular search is used for predicting the location of tread contact points, while the on-line iterative search is used for predicting flange contact points. By so doing, a computationally efficient procedure is achieved while keeping accurate predictions of contact points for severe contact scenarios such as sharp curve and turnout negotiations. The use of the proposed hybrid algorithm can eliminate the time-consuming on-line iterative search for the second points of contact. Since the location of the second point of contact is pre-computed by the contact geometry analysis, the occurrence of two-point contact can be predicted by using the look-up table at the one-point contact configuration. A flange climb simulation demonstrates that the proposed hybrid contact search algorithm can be effectively used for modeling wheel/rail contacts in the analysis of general multibody railroad vehicle systems.
Preoperative Pain Control in Arthroscopic Rotator Cuff Repair: Does It Matter?
Hisahiro Tonotsuka,Hiroyuki Sugaya,Norimasa Takahashi,Nobuaki Kawai,Hajime Sugiyama,Keishi Marumo 대한정형외과학회 2019 Clinics in Orthopedic Surgery Vol.11 No.2
Background: The purpose of this study was to clarify the importance of preoperative pain control using corticosteroid injections in patients with persistent rest pain (RP) before arthroscopic rotator cuff repair (ARCR). Methods: A total of 360 patients (374 shoulders) who underwent primary ARCR and were followed up for at least 2 years were enrolled. After one-to-one propensity score matching, 266 patients (145 men and 128 women, 273 shoulders) were included in the study. Their mean age was 65.2 ± 7.7 years (range, 42 to 88 years) at the time of surgery. The patients were divided into three groups: those who required several intra-articular or subacromial bursa corticosteroid injections preoperatively for refractory RP (group A+), those in whom RP was resolved preoperatively (group A−), and those who had no RP and did not require any injections (group B). The incidence of postoperative RP and preoperative and final follow-up American Shoulder and Elbow Surgeons (ASES) scores were compared among the three groups. Results: The incidence of postoperative RP was significantly higher in group A+ (35/91 cases, 38.5%) than in group A− (10/91, 11.0%) and group B (7/91, 7.7%, p < 0.001 for both). The preoperative ASES score was significantly lower in group A+ (33.2 ± 14.2) than in group A− (53.9 ± 11.9) and group B (62.3 ± 11.2, p < 0.001 for both), and it was significantly lower in group A− than in group B (p = 0.000). The final follow-up ASES score was significantly lower in group A+ (92.1 ± 8.4) than in group A− (97.6 ± 5.4) and group B (99.0 ± 2.5, p < 0.001 for both). There was no significant difference in the final follow-up ASES score between group A− and group B (p = 0.242). Conclusions: Patients in whom preoperative RP could be resolved before surgery achieved postoperative outcomes comparable to those in patients who had no RP before surgery, whereas the outcomes in patients with refractory preoperative RP were inferior. The results suggest that preoperative pain control is important in patients undergoing ARCR.
Giedre Zablackaite,Hiroyuki Shiotsu,Kentaro Kido,Tomoyuki Sugiyama Korean Nuclear Society 2024 Nuclear Engineering and Technology Vol.56 No.2
Radioactive iodine is a representative fission product to be quantified for the safety assessment of nuclear facilities. In integral severe accident analysis codes, the iodine behavior is usually described by a multi-physical model of iodine chemistry in aqueous phase under radiation field and mass transfer through gas-liquid interface. The focus of studies on iodine source term evaluations using the combination approach is usually put on the chemical aspect, but each contribution to the iodine amount released to the environment has not been decomposed so far. In this study, we attempted the decomposition by revising the two-film theory of molecular-iodine mass transfer. The model involves an effective overall mass transfer coefficient to consider the iodine chemistry. The decomposition was performed by regarding the coefficient as a product of two functions of pH and the overall mass transfer coefficient for molecular iodine. The procedure was applied to the EPICUR experiment and suppression chamber in BWR.
Takashi Motohashi,Akira Yabuno,Hiroshi Michimae,Tetsuro Ohishi,Miwa Nonaka,Masashi Takano,Shin Nishio,Hiroyuki Fujiwara,Keiichi Fujiwara,Eiji Kondo,Toru Sugiyama,Tsutomu Tabata 대한부인종양학회 2021 Journal of Gynecologic Oncology Vol.32 No.1
Objective: The standard dose for pegylated liposomal doxorubicin (PLD) is 50 mg/m2every 4weeks. While 40 mg/m2has recently been used in clinical practice, evidence supporting thisuse remains lacking. Methods: This phase III randomized, non-inferiority study compared progression free survival (PFS) for patients with platinum-resistant ovarian carcinoma between anexperimental arm (40 mg/m2PLD) and a standard arm (50 mg/m2PLD) until 10 courses,disease progression or unacceptable toxicity. Eligible patients had received ≤2 prior lines. Stratification was by performance status and PFS of prior chemotherapy (<3 months versus ≥3months). The primary endpoint was PFS and secondary endpoints were overall survival (OS),toxicity profile, clinical response and tolerability. The total number of patients was 470. Results: The trial was prematurely closed due to slow recruitment, with 272 patients randomizedto the experimental arm (n=137) and standard arm (n=135). Final analysis was performed with234 deaths and 269 events for PFS. In the experimental arm vs. standard arm, median PFS was4.0 months vs. 4.0 months (hazard ratio [HR]=1.065; 95% confidence interval [CI]=0.830–1.366)and median OS was 14.0 months vs. 14.0 months (HR=1.078; 95% CI=0.831–1.397). Hematologictoxicity and oral cavity mucositis (≥grade 2) were more frequent in the standard arm than in theexperimental arm, but no difference was seen in ≥grade 2 hand-foot skin reaction. Conclusion: Non-inferiority of 2 PLD dosing schedule was not confirmed because the trialwas closed prematurely. However, recommendation of dose reduction of PLD should bebased both on efficacy and safety. Trial Registration: UMIN Clinical Trials Registry Identifier: UMIN000003130