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An Explanatory Study Approach,Using Machine Learning to Forecast Solar Energy Outcome

Journal of Energy and Power Engineering 2022年第2期16卷 81-89页

作者： Agada Ihuoma Nkechi nagata yasunori Department of Electrical and Electronics Engineering University of the RyukyusOkinawa 903-0213Japan

AI(artificial intelligence)techniques play a crucially important role in predicting the expected energy outcome and its performance,analysis,modeling and control of renewable *** energy usage has grown exponentially over the *** the face of global energy consumption and increased depletion of most fossil fuel,the world is faced with the challenges of meeting the ever-increasing energy demands,also utility companies who provide solar energy have a challenge of unstable input of solar energy to the grid due to its intermittent nature,unlike other sources,hence the difference between expected generation and actual generation,demand and supply can lead to an unbalanced ***,incorporating accurately machine learning technology to predict the expected outcome of solar energy from the intermittent solar radiation will be crucial to keep a balance grid operation between supply and demand,production planning and energy management especially during installations of a photovoltaic power ***,one of the major problems of forecasting is the algorithms used to control,model,and predict performances of the energy systems which are complicated and involve large computer power,differential equations,and time *** having unreliable data(poor quality)for solar radiation over a geographical location as well as insufficient long series can be a bottleneck to *** overcome these problems,we employ the Anaconda Navigator(Jupyter Notebook)for machine learning which can combine large amounts of data with fast,iterative processing and intelligent algorithms allowing the software to learn automatically from patterns or features to predict the performance and outcome of Solar Energy which in turn enables the balance between supply and demand on loads,efficient operation of the utility company as well as enhances power production planning and management.

关键词： AI backward elimination data mining machine learning linear regression solar energy.

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Application of the Modified Force-Coupling Method of Tracing the Trajectories of Spherical Bubbles with Solid-Like and Slip Surfaces

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Open Journal of Fluid Dynamics 2017年第4期7卷 657-672页

作者： Chao Guan Shinichiro Yanase Koji Matsuura Toshinori Kouchi yasunori nagata Graduate School of Natural Science and Technology Okayama University Okayama Japan Department of Biomedical Engineering Faculty of Engineering Okayama University of Science Okayama Japan

The force-coupling method (FCM) developed by Maxey and Patel (2001) was modified and applied to trace the trajectories of spherical bubbles with solid-like and slip surfaces. Careful comparison was made to the experimental results of Takemura et al. (2000, 2002a, 2002b). First, the result obtained by use of the original version of the FCM was compared to the experimental results. It was found that the original FCM was not feasible for tracing spherical bubble trajectories. Then, a correction was made to the FCM calculation of the bubble velocity by renormalization in terms of the bubble Reynolds number, which could very well trace the trajectory of the bubble with a solid-like, no-slip surface, but not that of a bubble with a slip surface. Finally, a substantial correction was made to the monopole term of the FCM, which could trace the trajectory of a bubble with a solid-like or slip surface very well even for the Reynolds number up to 20.

关键词： Force-Coupling Method Vertical Wall Spherical Bubble Multiphase Flow

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Numerical Study of the Lift Force, Velocities and Pressure Distribution of a Single Air Bubble and Two Interacting Air Bubbles Rising in Quiescent Liquid

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Open Journal of Fluid Dynamics 2020年第1期10卷 31-51页

The study of multiphase flow consisting of liquid and air bubbles has been attracting the interest of many researchers. Numerical methods for such a system are, however, facing difficulty in numerical accuracy and a heavy computational load. In this paper, we made corrections to the modified force-coupling method in our previous papers and applied it to the numerical studies of a single air bubble rising near a vertical wall and two interacting air bubbles rising in line in quiescent liquid. Corrections were made to the effective ranges of the force-coupling method. The calculation results showed that the lift force acting on an air bubble obtained by the experimental data was more accurately reproduced than those by our previous method. We accurately calculated the time evolution of the velocities of interacting two air bubbles rising in line obtained in the previous experiments and resolved the physical mechanism of the relative movement of two bubbles. We also found the present method is much quicker and needs much smaller memory capacity than other methods, such as the volume of fluid method.

关键词： Force-Coupling Method Multiphase Flow Bubble Motion Two Bubble Interaction

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Epidemiological impact of revoking mask-wearing recommendation on COVID-19 transmission in Tokyo,Japan

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Infectious Disease Modelling 2024年第4期9卷 1289-1300页

作者： Mayu nagata Yuta Okada Hiroshi Nishiura Kyoto University School of Public Health Yoshida-KonoeSakyoKyoto606-8601Japan

Despite the global implementation of COVID-19 mitigation measures,the disease continues to maintain *** mask wearing became one of the key measures for preventing the transmission of COVID-19 early in the pandemic period,many countries have relaxed the mandatory or recommended wearing of *** objective of the present study was to estimate the epidemiological impact of removing the mask-wearing recommendation in *** developed a model to assess the consequences of declining mask-wearing coverage after the government revoked its recommendation in February *** declining mask-wearing coverage was estimated using serial cross-sectional data,and a mathematical model was devised to determine the age-specific incidence of COVID-19 using the observed case count in Tokyo from week of October 3,2022 to October 30,*** explored model-based counterfactual scenarios to measure hypothetical situations in which the mask-wearing coverage decreases or increases relative to the observed *** results show that mask-wearing coverage declined from 97%to 69%by the week of October 30,2023,and that if the mask-wearing recommendation had continued,427 lives could have been saved in *** the mask-wearing coverage had declined to 25%of the observed level,the model suggests there might have been 1587 additional ***,revoking the mask-wearing recommendation had a substantial epidemiological *** future pandemics,our proposed approach could provide a realtime quantification of the effects of relaxing countermeasures.

关键词： COVID-19 Mask wearing recommendation Health policy Counterfactual Mathematical model

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Bell Operator Method to Classify Local Realistic Theories

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Chinese Physics Letters 2010年第3期27卷 29-32页

作者： Koji nagata Department of Agriculture and of Veterinary Medicine National Research Center for Protozoan Diseases University of Obihiro West 2-13 Inada Obihiro Hokkaido 080-8555 Japan

We review the historical fact of multipartite Bell inequalities with an arbitrary number of settings. An explicit local realistic model for the values of a correlation function, given in a two-setting Bell experiment （two-setting model）, works only for the specific set of settings in the given experiment, but cannot construct a local realistic model for the values of a correlation function, given in a continuous-infinite settings Bell experiment （infinite-setting model）, even though there exist two-setting models for all directions in space. Hence, the two-setting model does not have the property that the infinite-setting model has. Here, we show that an explicit two-setting model cannot construct a local realistic model for the values of a correlation function, given in an M-setting Bell experiment （M-setting model）, even though there exist two-setting models for the M measurement directions chosen in the given M-setting experiment. Hence, the two-setting model does not have the property that the M-setting model has.

关键词： Quantum information and quantum mechanics

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Advances in traction methods for endoscopic submucosal dissection:What is the best traction method and traction direction?

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World Journal of Gastroenterology 2022年第1期28卷 1-22页

作者： Mitsuru nagata Department of Endoscopy Shonan Fujisawa Tokushukai HospitalKanagawa 251-0041Japan

Endoscopic submucosal dissection(ESD)has been developed as a treatment for superficial gastrointestinal neoplasms,which can achieve en bloc resection regardless of the lesion ***,ESD is technically difficult because endoscopists cannot bring their hand into the gastrointestinal tract,unlike surgeons in regular *** is difficult to obtain sufficient tension in the dissection plane and a good field of ***,ESD is associated with a long procedure time and a high risk of adverse events in comparison with endoscopic mucosal *** methods have been developed to provide sufficient tension for the dissection plane and a good field of vision during the ESD ***,traction direction is limited in most traction methods,resulting in insufficient effect in some *** traction direction is considered important,there have been few investigations of its *** the first half of this review,important traction methods are discussed,including traction *** second half,appropriate traction methods for each organ are *** important considerations for traction method,such as ability to adjust traction strength,interference between traction device and endoscope,and the need for specialized devices are also discussed.

关键词： Endoscopic submucosal dissection Traction method Countertraction Traction direction Vertical traction

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Granulocyte colony-stimulating factor-producing hepatocellular carcinoma with abrupt changes

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World Journal of Clinical Oncology 2016年第5期7卷 380-386页

作者： Hiroaki nagata Shuhei Komatsu Wataru Takaki Tokunari Okayama yasunori Sawabe Michiaki Ishii Mitsuo Kishimoto Eigo Otsuji Hiroshi Konosu Division of Digestive Surgery Department of Surgery Kyoto Prefectural University of Medicine Department of Surgery Ayabe City Hospital Department of Gastroenterology Ayabe City Hospital Department of Surgical Pathology Kyoto Prefectural University of Medicine

Granulocyte colony-stimulating factor(G-CSF)-producing tumor is one of the rare types of cancer clinically characterized by an elevated fever and white blood cell(WBC) increment. Although G-CSF producing tumors have been reported in several types of cancer including those of the lungs, cervix and bladder, G-CSF producing hepatocellular carcinoma is extremely rare. Here, we report the case of a rapidly growing and poorly differentiated hepatocellular carcinoma producing G-CSF. The patient showed symptoms of continuous high fever, stomach pain and cough, and high serum WBC counts, C-reactive protein(CRP) and G-CSF levels were found in laboratory tests. After a radical hepatectomy, the patient completely recovered from the above symptoms and inflammatory state. The serum levels of G-CSF were reduced to normal levels after radical surgery. An immunohistochemical analysis revealed the overexpression of G-CSF in the cytoplasm of certain hepatocellular carcinoma(HCC) cell. The patient's serum WBC, CRP and G-CSF levels remained within normal levels in the six months after surgery without recurrence. This is the 9^(th) case report of G-CSF producing hepatocellular carcinoma in English literature. We review the clinical characteristics of the G-CSF producing HCC and discuss a possible treatment strategy.

关键词： Granulocyte colony stimulating factor Granulocyte colony-stimulating factor producing tumor Hepatocellular carcinoma Immunohistochemistry Sarcomatous changes

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Experimental Study on Load Characteristics in a Floating Type Pendulum Wave Energy Converter

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Journal of Thermal Science 2014年第5期23卷 465-471页

作者： Tengen Murakami Yasutaka Imai Shuichi nagata Institute of Ocean Energy Saga University

A floating type pendulum wave energy converter(FPWEC) with a rotary vane pump as the power take-off system was proposed by Watabe et *** *** showed that this device had high energy conversion *** the previous research,the authors conducted 2D wave tank tests in regular waves to evaluate the generating efficiency of FPWEC with a power take-off system composed of pulleys,belts and a *** a result,the influence of the electrical load on the generating efficiency was ***,the load characteristics of FPWEC are pursued experimentally by using the servo motors to change the damping coefficient in this *** a later part of this paper,the motions of the model with the servo motors are compared with that of the case with the same power take-off system as the previous *** the above experiment,it may be concluded that the maximum primary conversion efficiency is achieved as high as 98%at the optimal load.

关键词： pendulum wave energy converter floating type load characteristics primary conversion efficiency

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Adaptive Learning with Large Variability of Teaching Signals for Neural Networks and Its Application to Motion Control of an Industrial Robot

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International Journal of Automation and computing 2011年第1期8卷 54-61页

作者： Fusaomi nagata Keigo Watanabe Department of Mechanical Engineering Faculty of Engineering Tokyo University of Science Department of Intelligent Mechanical Systems Graduate School of Natural Science and Technology Okayama University

Recently, various control methods represented by proportional-integral-derivative （PID） control are used for robotic control. To cope with the requirements for high response and precision, advanced feedforward controllers such as gravity compensator, Coriolis/centrifugal force compensator and friction compensators have been built in the controller. Generally, it causes heavy computational load when calculating the compensating value within a short sampling period. In this paper, integrated recurrent neural networks are applied as a feedforward controller for PUMA560 manipulator. The feedforward controller works instead of gravity and Coriolis/centrifugal force compensators. In the learning process of the neural network by using back propagation algorithm, the learning coefficient and gain of sigmoid function are tuned intuitively and empirically according to teaching signals. The tuning is complicated because it is being conducted by trial and error. Especially, when the scale of teaching signal is large, the problem becomes crucial. To cope with the problem which concerns the learning performance, a simple and adaptive learning technique for large scale teaching signals is proposed. The learning techniques and control effectiveness are evaluated through simulations using the dynamic model of PUMA560 manipulator.

关键词： Neural networks large-scale teaching signal sigmoid function adaptive learning servo system PUMA560 manipulator trajectory following control nonlinear control.

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Protein and non-protein sulfhydryls and disulfides in gastric mucosa and liver after gastrotoxic chemicals and sucralfate: Possible new targets of pharmacologic agents

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World Journal of Gastroenterology 2007年第14期13卷 2053-2060页

作者： Lajos Nagy Miki nagata Sandor Szabo Departments of Pathology Brigham & Women's Hospital Harvard Medical SchoolBostonMassachusetts 02115and Pathology and Laboratory Medicine ServiceDiagnostic & Molecular Medicine HCGVA Medical Center9901 East 7th St. Long BeachCA 90822United States Depts. of 3rd Internal Medicine and Family MedicineFaculty of MedicineUniversity of PecsH-7632 PecsHungary Departments of Pathology Brigham & Women's Hospital Harvard Medical SchoolBostonMassachusetts 02115and Pathology and Laboratory Medicine ServiceDiagnostic & Molecular Medicine HCGVA Medical Center9901 East 7th St. Long BeachCA 90822United States

AIM： To investigate the role of major non-protein and protein sulfhydryls and disulfides in chemically induced gastric hemorrhagic mucosal lesions （HML） and the mechanism of gastroprotective effect of sucralfate.METHODS： Rats were given 1 mL of 75% ethanol, 25%NaCl, 0.6 mol/L HCI, 0.2 mol/L NaOH or 1% ammonia solutions intragastrically （i.g.） and sacrificed 1, 3, 6 or 12 min later. Total （reduced and oxidized） glutathione （GSH ＋ GSSG）, glutathione disulfide （GSSG）, protein free sulfhydryls （PSH）, protein-glutathione mixed disulfides （PSSG） and protein cystine disulfides （PSSP） were measured in gastric mucosa and liver.RESULTS： Reduced glutathione （GSH） was depleted in the gastric mucosa after ethanol, HCI or NaCl exposure,while oxidized glutathione （GSSG） concentrations increased, except by HCI and NaOH exposure. Decreased levels of PSH after exposure to ethanol were observed,NaCl or NaOH while the total protein disulfides were increased. Ratios of reduced to oxidized glutathione or sulfhydrils to disulfides were decreased by all *** changes in thiol homeostasis were detected in the liver after i.g. abbreviation should be spelled out the first time here administration of ethanol. Sucralfate increased the concentrations of GSH and PSH and prevented the ethanol-induced changes in gastric mucosal thiol concentrations.CONCLUSION： Our modified methods are now suitable for direct measurements of major protein and nonprotein thiols/disulfides in the gastric mucosa or liver.A common element in the pathogenesis of chemically induced HML and in the mechanism of gastroprotective drugs seems to be the decreased ratios of reduced and oxidized glutathione as well as protein sulfhydryls and disulfides.

关键词： Non-protein and protein thiol Gastricmucosal injury Gastroprotection Sucralfate

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