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( Hirofumi Nakayama ),( Yasuyuki Kimura ),( Takayuki Shimaoka ),( Ryoichi Furuta ),( Ichiro Hiura ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Radioactive materials were widely spread as a result of a nuclear accident at the Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Plant initiated by the 2011 Tohoku Earthquake, which occurred on March 11. Radioactive decontamination work for the same is still underway. At the temporary storage sites, decontamination wastes are stored in flexible containers and gas-permeable waterproof sheets are used for capping to cover the waste. However, currently, 6 years after the accident, several capping sheets are being reported as damaged, raising concerns about the contamination of surrounding environment because of rain leaking through the capping sheet. Large puddles formed on top of the capping sheets are the main cause for their damage. The reported damages include tears in the capping sheet materials and separation of joints caused by the tension generated by the puddles. More than 1000 temporary storage sites have been constructed and more than 100,000 mountains have been built. At these sites, it is necessary to monitor the puddles formed on the capping sheets and inspect the resulting damages. Although visual inspection of temporary storage sites is currently being conducted approximately once a month, the number of temporary storage sites is vast and conducting inspection by climbing on degraded capping sheets involves a risk in terms of the safety of the workers. Therefore, this study investigates a monitoring method to locate a site with a high probability of damages on the capping sheets via measurement of the strain generated by the puddles on the sheets and using a drone to photograph and analyze the temporary storage sites. This study generated 3D models via SfM analysis of the images photographed by drones and aimed to develop a method to estimate the damage endangered area by estimating the stress and strain distribution with FEM using the coordinate data of the point groups forming the 3D models as the input data. The results of this study are as follows: Strain and stress generated by the puddles are concentrated at the edges of the puddles. For mock temporary storage site, we were able to confirm a strain of approximately 20% and stress of 9 MPa measured by adhering a strain gauge to the capping sheet. This is five times greater than 1.75 MPa, the self-standard value of the capping sheet strength set by the Japan Water Sealing Association, and therefore, monitoring of the sheet is considered to be of utmost importance. There was an increase in the strain and stress values near the vicinity of the puddle center; however, they were only about half of the values at the edges. Strain and stress distribution for mock temporary storage sites were calculated via FEM analysis. Because the measured results and the analytically calculated values were consistent in terms of the location and the degree of strain, we can infer that there is a constant validity and believe that it is possible to apply this to an actual site. The method developed in this study was applied for the detection of damage endangered area at an actual temporary storage site for decontamination waste in Fukushima. Concentration of the strain and stress near the top of the slope at the edge of the temporary storage site was confirmed and the strain value was recorded up to a maximum of 4%, while a maximum of 1.8 MPa was attained for the stress. These values slightly exceed 1.75 MPa, which is the self-standard tensile strength set by the Japan Water Sealing Association.
Sachin Ashok Bhor,Kaname Nakayama,Hirofumi Ono,Toshiko Iwashita,Koichi Kinoshita The Korean Society for Reproductive Medicine 2023 Clinical and Experimental Reproductive Medicine Vol.50 No.2
Objective: This study aimed to determine the effect of ovarian stimulation regimens on the top-quality blastocyst development rate and perinatal outcomes with the freeze-all strategy. Methods: A retrospective comparative cohort analysis of 149 in vitro fertilization (IVF) cycles using the freeze-all strategy was conducted. The IVF cycles were stimulated with either a gonadotropin-releasing hormone antagonist or clomiphene citrate along with gonadotropin based on the patient's serum anti-Müllerian hormone level. Oocyte retrieval, fertilization, and embryo culture were performed following standard procedures. All good-quality blastocysts were cryopreserved and used for frozen-thawed embryo transfer (FET) in subsequent cycles. The fertilization, blastulation, and top-quality blastocyst development rates were calculated. The perinatal outcomes of FET cycles, gestational period, and birth weight were assessed. Results: The main outcome of this study was the top-quality blastocyst development rate, and the secondary outcomes were perinatal parameters (e.g., gestational period and birth weight) between the stimulation regimens. Despite the higher number of usable-quality embryos in the antagonist group, the blastocyst development rate remained comparable (p=0.105). Similarly, perinatal outcomes were comparable in subsequent FET cycles (p=0.538). Conclusion: These findings suggest that the choice between antagonist and clomiphene citrate with gonadotropin as stimulation in controlled ovarian stimulation regimens may not affect the top-quality blastocyst development rate. The IVF outcomes (e.g., clinical pregnancy, miscarriage, and live birth rates) remained unaffected in subsequent FET cycles. Unlike fresh embryo transfer, the birth weight and gestational length were not associated with prior controlled ovarian stimulation regimens when the freeze-all strategy was used.
( Teppei Komiya ),( Takuma Maeda ),( Yuki Kajino ),( Hirofumi Nakayama ),( Takayuki Shimaoka ),( Takayuki Hirao ),( Shuji Watanabe ),( Makoto Takemoto ),( Naoya Maeda ),( Akiyuki Ukai ),( Fumihiro Kas 한국폐기물자원순환학회(구 한국폐기물학회) 2019 한국폐기물자원순환학회 심포지움 Vol.2019 No.1
Approximately 20% of solid waste in Japan is disposed of at coastal landfill sites. It is an issue that it takes long-term to stabilize coastal landfill sites. Municipal solid waste incineration bottom ash (BA) is one of main wastes landfilled at coastal landfill sites. It is known that finer particles contain more contaminants in BA1), and it was demonstrated that the removal of finer particles from BA produced the lowering pH of leachate as well as the increase of permeability of the landfilled waste layer2). In this study, open channel (OC) classification was focused on as a feasible technique to remove finer particles from BA on a coastal landfill site, and its demonstrational experiment was carried out in order to clarify if the fine particle fraction (d<0.425mm) (FPF) could be removed from BA by OC classification and the settling characteristics of BA in OC. Fig. 1 shows the experimental apparatus. The sea water in a coastal landfill site was pumped up and flowed in OC, and BA is supplied on the surface of the flowing water. After completions of the settling and outflow of BA, saucers on the bottom of OC was collected, and the dry weight and particle size distribution of the BA sediment in each saucer were measured. Table 1 shows the experimental condition. The settling section means the part of OC from the BA supply point to the end of OC. Fig. 2 shows the removal ratio of FPF by OC classification, which is the ratio of the dry weight of FPF in the BA sediment to that in the BA supplied. The largest removal ratio was 61% in Case 3 with the largest water flow velocity and the shortest length of settling section. Fig. 3 shows the median of the settling velocity of BA in OC (MSV) compared with the theoretical settling velocity by Allen’s and Newton’s laws (TSV). The MSV of BA particles greater than 3mm was almost 50% of TSV, and MSV became closer to TSV as BA’s particle size became smaller. The MSV of BA particles with a diameter of 0.425mm was approximately 80% of TSV.
Norio Yasui-Furukori,Hiroshi Murakami,Hideyuki Otaka,Jutaro Tanabe,Miyuki Yanagimachi,Masaya Murabayashi,Koki Matsumura,Yuki Matsuhashi,Hirofumi Nakayama 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.1
Objective: Glycemic control varies based on lifestyle factors and stress coping mechanisms, which are influenced by personality. The psychological factors associated with glycemic control have not yet been established in patients with type 2 diabetes mellitus (T2DM). The relationship between a 5-factor model of personality and glycemic control was evaluated in individuals with T2DM. Methods: The subjects were 503 Japanese outpatients with T2DM. Glycated hemoglobin A1c (HbA1c) levels, depressive status, insomnia and personality traits were assessed. Lifestyle factors of the patients, such as habitual alcohol consumption and smoking, were also included in the analyses. ResultsBecause the influence of insulin therapy on HbA1c is so strong, we stratified the patients according to : insulin use. Simple regression analysis showed a significant correlation between HbA1c and neuroticism in patients who did not use insulin. After adjustment for confounders, multiple regression analyses revealed that none of the personality factors, including neuroticism, were found to be associated with HbA1c. Conclusion: These findings suggest that personality traits do not have a large impact on glycemic control. Further studies are required to confirm the relationships between psychological factors and glycemic control using a longitudinal study design.