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Fundamental Study of High Step-down Non-isolated Multicellular DC-DC Converter for Future DC Distribution Systems

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Journal of Energy and Power Engineering 2017年第9期11卷 605-613页

作者： yusuke hayashi Yoshikatsu Matsugaki Tamotsu Ninomiya Green Electronics Research Institute Kitakyusyu Fulmoka 808-0135 Japan

A novel high step-down non-isolated DC-DC converter has been proposed. The proposed converter consists of highly efficient non-isolated cell converters using bidirectional semiconductor power devices, and these cell converters are connected in ISOP （input series and output parallel）. The non-isolated ISOP converter achieves high step-down ratio of D/N, operating N cell converters under the duty ratio olD. Availability of the proposed converter has been shown by developing the 48 V-12 V laboratory prototype using two 24 V-12 V cell converters. Design consideration for the 48 V-3 V multicellular converter using four 12 V-3 V cell converters has been also conducted, and the potential to approach the efficiency of 97% has been discussed. The proposed topology is suitable for the POL （point of load） converters in the highly efficient next generation DC distribution system for data centers.

关键词： DC-DC converter high step-down ratio ISOP GaN (gallium nitride).

Design Consideration for High Power Density GaN Buck-Rectifier in ISOP-IPOS Converter based dc Distribution, System

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Journal of Energy and Power Engineering 2015年第6期9卷 574-584页

作者： yusuke hayashi Hiroshi Iso Daisuke Hara Akira Matsumoto Division of Electrical Electronic and Information Engineering Graduate School of Engineering Osaka University Osaka5650871 Japan Research and Department Headquarters NTT (Nippon Telegraph and Telephone) Facilities lnc. (Incorporated) Tokyo 1700004Japan

GaN （gallium nitride） buck-rectifier has been proposed to realize high power density ISOP （input series and output parallel）-IPOS （input parallel and output series） converter-based dc distribution system. The ultra-low loss bi-directional switch can be developed by the GaN power device because of the low on-resistance, the high-speed switching behavior and its own device structure. The buck-rectifier using the GaN bi-directional switches has the potential to achieve higher power density than the commonly utilized boost-rectifier. Availability of the GaN-HEMT （high electron mobility transistor） for the buck rectifier has been verified taking the theoretical limit of the on-resistance and the switching loss energy into account. Design consideration for a high power density buck-rectifier has been also conducted and the application effect of the GaN bidirectional switches has been evaluated quantitatively. The ISOP-IPOS converter-based dc （direct current） distribution system takes full advantage of the buck-rectifier and the rectifier using GaN devices contributes to realizing higher power density dc distribution system.

关键词： ac (alternate current)-dc converter GaN (gallium nitride) power device power density dc distribution ISOP-IPOStopology.

Esophagotracheal fistula caused by gastroesophageal reflux 9 years after esophagectomy

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World Journal of Gastroenterology 2007年第5期13卷 801-803页

作者： Kiyotomi Maruyama Satoru Motoyama Manabu Okuyama yusuke Sato Kaori hayashi Yoshihiro Minamiya Jun-ichi Ogawa Department of Surgery Akita University School of Medicine 1-1-1 Hondo Akita Japan

Fistula between digestive tract and airway is one of the complications after esophagectomy with lymph node dissection. A case of esophagotracheal fistula secondary to esophagitis 9 years after esophagectomy and gastric pull-up for treatment of esophageal carcinoma is described. It was successfully treated with transposition of a pedicled pectoralis major muscle flap.

关键词： Esophagus Fistula Surgery Complications Esophagitis Reflux

Clinical impact of surveillance for head and neck cancer in patients with esophageal squamous cell carcinoma

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World Journal of Gastroenterology 2017年第6期23卷 1051-1058页

作者： Hiroyuki Morimoto Tomonori Yano yusuke Yoda Yasuhiro Oono Hiroaki Ikematsu Ryuichi hayashi Atsushi Ohtsu Kazuhiro Kaneko Department of Gastroenterology and Endoscopy National Cancer Center Hospital East Course of Advanced Clinical Research of Cancer Juntendo University Graduate School of Medicine Department of Head and Neck Surgery National Cancer Center Hospital East National Cancer Center Hospital East Division of Science and Technology for Endoscopy National Cancer Center Hospital East

To evaluate the clinical impact of surveillance for head and neck (HN) region with narrow band imaging (NBI) in patients with esophageal squamous cell carcinoma (ESCC).METHODSSince 2006, we introduced the surveillance for HN region using NBI for all patients with ESCC before treatment, and each follow-up. The patients with newly diagnosed stage I to III ESCC were enrolled and classified into two groups as follows: Group A (no surveillance for HN region); between 1992 and 2000), and Group B (surveillance for HN region with NBI; between 2006 and 2008). We comparatively evaluated the detection rate of superficial head and neck squamous cell carcinoma (HNSCC), and the serious events due to metachronous advanced HNSCC during the *** total 561 patients (group A: 254, group B: 307) were enrolled. Synchronous superficial HNSCC was detected in 1 patient (0.3%) in group A, and in 12 (3.9%) in group B (P = 0.008). During the follow up period, metachronous HNSCC were detected in 10 patients (3.9%) in group A and in 30 patients (9.8%) in group B (P = 0.008). All metachronous lesions in group B were early stage, and 26 patients underwent local resection, however, 6 of 10 patients (60%) in group A lost their laryngeal function and died with metachronous *** for the HN region by using NBI endoscopy increase the detection rate of early HNSCC in patients with ESCC, and led to decrease serious events related to advanced metachronous HNSCC.

关键词： esophageal squamous cell carcinoma head and neck squamous cell carcinoma Narrow band imaging endoscopic resection surveillance metachronous cancer

Advanced Reactive Power Control at Individual Residences to Smooth Energy Loss Fluctuation for a Clustered Grid-Interconnected PV System

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Journal of Energy and Power Engineering 2013年第8期7卷 1539-1552页

作者： yusuke Miyamoto Yasuhiro hayashi Research & Development Department Technology Research & Development Institute Kandenko Co. Ltd. Tokyo 108-8533Japan Department of Electrical Engineering and Bioscience Faculty of Science and Engineering Waseda University Tokyo 169-8555Japan

Reactive power control can control voltage within the proper range from the power network side or from the distribution generation （PV （photovoltaic）） side. Reactive power control from the power network side is simpler because little controlled object apparatus, such as STATCOM, is required. However, it is difficult to optimize the individual voltages of residential consumers because few data have been obtained by the power network side as compared with the power generation side. Energy loss at each residence with PV is different due to the difference in the grid-interconnection condition, such as distribution line impedance when the same operating voltage is set at all residences. Therefore, in this paper, the authors propose an advanced reactive power control method for residential PV systems in order to optimally control the voltage at individual residences so as to minimize energy loss fluctuation. The effectiveness of the proposed reactive power control is demonstrated by numerical simulation.

关键词： Distribution line grid-interconnection output suppression photovoltaic power systems reactive power sending voltage voltage control voltage increase.

Effectiveness of Optimal Arrangement of the Residences Operated by Reactive Power Control for a Clustered Grid-Interconnected PV System

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Journal of Energy and Power Engineering 2013年第7期7卷 1415-1422页

作者： yusuke Miyamoto Yasuhiro hayashi Research & Development Department Technology Research & Development Institute Kandenko Co. Ltd. Tokyo 108-8533 Japan Department of Electrical Engineering and Bioscience Faculty of Science and Engineering Waseda University Tokyo 169-8555 Japan

There is a danger of power generation efficiency decreasing due to voltage increase when clustered residential PV systems are grid-interconnected to a single distribution line. As a countermeasure, installation of the reactive power control of an inverter at each residence has been considered. However, there are not many types of inverters that can operate reactive power control because there are insufficient effects on a low voltage distribution line with low penetration PV with reactive power control. Therefore, it is necessary to consider how to increase generation efficiency with a lower number of inverters. In this paper, four Japanese standard distribution line structures, for example of a residential area on ＂C1＂, where 2,160 residential PV systems are grid-interconnected, are selected. The optimal setting of reactive power control at each residence is computed on the distribution lines with a greedy method.

关键词： Distribution line grid-interconnection photovoltaic power systems reactive power control voltage increase.

Factors Affecting Catecholamines in Caregivers of Patients with Dementia

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Journal of Geriatric Medicine 2021年第1期3卷 32-37页

作者： Akemi Hirano yusuke Suzuki Toshio hayashi Koichiro Ina Joji Onishi Department of Adult Nursing Shubun University6 Nikko-choIchinomiyaAichi 491-0938Japan Centre for Community Liaison and Patient Consultations Nagoya University Hospital65 TsurumaShowaNagoyaAichi 466-8550Japan Department of Community and In-Home Nursing Nagoya University Graduate School of MedicineSchool of Health SciencesDaiko-MinamiHigashi-kuNagoyaAichi 461-8673Japan Department of Internal Medicine Ina Clinic3-111 HirabariTenpakuNagoyaAichi 468-0011Japan Department of Community Healthcare&Geriatrics Nagoya University Graduate School of Medicine65 TsurumaShowaNagoyaAichi 466-8550Japan

Background:Caregivers of dementia patients have significantly higher levels of serum IL-6 and CRP compared to non-caregivers,and the accumulation of everyday stressors reportedly promotes the induction of inflammatory ***,few studies have identified factors that affect catecholamine levels in caregivers who experience a combination of physical and mental stress from ***:This study aimed to identify physical factors that impact catecholamine levels in caregivers of dementia ***:Participants were elderly caregivers living together with elderly Alzheimer’s-type dementia *** performed logistic regression analysis,with levels of adrenaline,noradrenaline,and dopamine(indicators of catecholamine)as dependent ***:Caregiver BMI had a significant impact on adrenaline levels(OR:0.792;95%CI:0.654-0.960)and noradrenaline levels(OR:1.210;95%CI:1.009-1.451),whereas age had a significant impact on dopamine levels(OR:1.162;95%CI:1.019-1.324).Discussion:While caregiver BMI significantly impacted adrenaline and noradrenaline levels,the mechanism underlying these relationships is *** possibility is that obesity(BMI)and a rise in sympathetic nerve activity contributed to *** findings suggest that chronic stress in elderly caregivers may potentially impair the dopaminergic activation system in the ***:There is a need to identify factors which increase BMI in *** studies aimed at gaining a better understanding of the lifestyle habits of caregivers and intervention studies aimed at reducing their BMI are warranted.

关键词： Age BMI Caregiver burden Catecholamine Dementia

Effects of Free Time on Quality of Life in Elderly Caregivers

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Journal of Geriatric Medicine 2021年第1期3卷 26-31页

Caregivers who contribute to health care of their patients are significantly more likely to experience emotional difficulty,physical difficulty,and financial difficulty,than caregivers who do not *** study aimed to examine the effects of free time on health-related quality of life among elderly caregivers of dementia *** the intervention group,caregivers set aside free time every 30 minutes three times a week,while continuing to care for *** the free time,caregivers were free to spend time at home and do whatever they *** control group received only usual *** intervention period was six *** Vitality subscale score of the SF-36 decreased significantly in the intervention group,despite more than half(57.1%)of participants showing improvements or no change in the rank of this subscale relative to baseline,as assessed by the Wilcoxon signed-rank test(not significant).Caregivers indicated that daily caregiving resulted in an accumulation of physical fatigue,and they continued to have little mental *** also had difficulty securing free time,which may have hindered improvements to their *** is a need to develop a home-based program that can alleviate caregiver stress and improve their quality of life.

关键词： Free time Dementia Elderly caregiver Quality of life

Two-dimensional self-assembly of melem and melemium cations at pH-controlled aqueous solution-Au（111） interfaces under electrochemical control

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Frontiers of Chemical Science and Engineering 2016年第2期10卷 294-300页

作者： Shinobu Uemura Kenki Sakata Masashi Aono yusuke Nakamura Masashi Kunitake Department of Advanced Materials Sciences Faculty of Engineering Kagawa University Kagawa 761-0396 Japan Graduate School of Science and Technology Kumamoto University Kumamoto 860-8555 Japan

Two-dimensional self-assembly of melem at pH-controlled aqueous solution-Au（111） interfaces has been investigated by electrochemical scanning tunneling microscopy. In the solutions with pH 〉 pKbl of melem, two ordered self-assembled structures （honeycomb and close-packed structures） and one disordered fibrillar structure were observed as a function of the surface coverage ofmelem controlled by the electrode potential. In contrast, in the acidic solution with pH 〈 pKbl of melem, only the self-assembled honeycomb network was observed in a relatively wide potential range probably due to the presence of monoprotonated melem cations. Dots attrib- uted to counteranions were frequently observed in the pores of the honeycomb network. The lack of close-packed and fibrillar structures at low pH （〈 pKbl） is attributed to ionic repulsion of melemium cations.

关键词： self-assembly scanning tunneling micro-scopy electrochemistry structural phase transition melem