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Study on Metal Detection with an Electromagnetic Induction Probe Utilizing a Rotating Magnetic Field

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Journal of Mechanics Engineering and Automation 2022年第3期12卷 65-76页

作者： Kiyoshi koyama College of Industrial Technology Nihon UniversityNarashino Chiba 275-8575Japan

The present paper describes an investigation conducted on metal detectors installed with a scanning *** authors applied a rotating magnetic field probe to metal *** rotating magnetic field probe is comprised of two vertically placed rectangular exciting coils and a circular detecting *** experimental results confirmed that the probe can detect metal objects and provide more information about their shape,direction,and electromagnetic characteristics than conventional metal detector probes.A two-dimensional signal display shows a low-resolution image of the metal object and the signal phase indicates the object’s direction and electromagnetic *** experimental results show that excellent reconstruction of the surface shapes of metal objects can be obtained for both magnetic and nonmagnetic metals under present *** is also the potential for the approximate shape of a metal object to be estimated from the reconstructed image.

关键词： Metal detection rotating magnetic field MD(metal detector) image reconstruction metal shape restoration.

Study of 41 Cases of Pregnancy after Uterine Leiomyoma Treatment by Uterine Artery Embolization (UAE)

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Open Journal of Obstetrics and Gynecology 2018年第13期8卷 1255-1259页

作者： Takahisa Kojima Hidefumi Fujisawa Kumiko koyama Amor Clinic Yokohama Japan Department of Radiology Showa University Northern Yokohama Hospital Yokohama Japan

Uterine leiomyoma, a benign tumor, may be treated with hormone therapy, conventional surgical resection and uterine artery embolization (UAE): this paper reports the study on safety after UAE treatment. Pregnancy processes and prognoses of a total of 41 cases from 39 patients (two women were pregnant twice) who succeeded to pregnancy after UAE treatment in our clinic were studied. The average age of patients was 34.5 (29 - 40). Patients included 24 cases of multiple uterine leiomyoma and 14 cases of solitary leiomyoma;the average size of leiomyoma was 388.3 cm3 (15 - 1059 cm3) and the average period between UAE operation and pregnancy was 26.5 months (1 - 120). Causes of pregnancy were 29 cases of natural pregnancy and 12 cases of infertility treatment: 28 cases succeeded in delivery, 7 cases resulted in spontaneous abortion, and 6 cases are ongoing. Premature birth, placental abnormality and low-weight babies were observed in 3, 3, and 1 cases, respectively;the latter 1 case was of triplets. Although the incidence of placental abnormality was a little high, no other serious complications were observed, suggesting that pregnancy after UAE has no problem from the obstetric point of view. In the future, UAE is considered to be worthwhile if carefully done for cases who want to become pregnant.

关键词： Embolization Gelatin Sponge Particles Leiomyoma Pumping Method Uterine Artery Embolization (UAE) Uterine Leiomyoma Pregnancy Risk

Numerical modeling for the coupled thermo-mechanical processes and spalling phenomena in sp Pillar Stability Experiment (APSE)

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Journal of Rock Mechanics and Geotechnical Engineering 2013年第1期5卷 58-72页

作者： T.koyama M.Chijimatsu H.Shimizu S.Nakama T.Fujita A.Kobayashi Y.Ohnishi Department of Urban Management Kyoto University Hazama Corporation Institute of Fluid Science Tohoku University Japan Atomic Energy Agency (JAEA) Faculty of Environmental and Urban Engineering Kansai University Kyoto University

In this paper, the coupled thermo-mechanical （TM） processes in the AEspoe Pillar Stability Experiment （APSE） carried out by the Swedish Nuclear Fuel and Waste Management Company （SKB） were simulated using both continuum and discontinuum based numerical methods. Two-dimensional （2D） and three- dimensional （3D） finite element method （FEM） and 2D distinct element method （DEM） with particles were used. The main objective for the large scale in situ experiment is to investigate the yielding strength of crystalline rock and the formation of the excavation disturbed/damaged zone （EDZ） during excavation of two boreholes, pressurizing of one of the boreholes and heating. For the DEM simulations, the heat flow algorithm was newly introduced into the original code. The calculated stress, displacement and temperature distributions were compared with the ones obtained from in situ measurements and FEM simulations. A parametric study for initial microcracks was also performed to reproduce the spalling phenomena observed in the APSE.

关键词： Coupled thermo-mechanical (TM)processesAspoe Pillar Stability Experiment (APSE)Excavation disturbed/damaged zone (EDZ)Finite element method (FEM)Distinct element method (DEM)

Evaluation of TlOH Effect for Pd0-Mediated Cross-Coupling of Methyl Iodide and Excess Boronic Acid Ester toward Fabrication of [11C]CH3-Incorporated PET Tracer

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International Journal of Organic Chemistry 2013年第3期3卷 220-223页

作者： Hiroko koyama Hisashi Doi Masaaki Suzuki Department of Clinical and Experimental Neuroimaging Center for Development of Advanced Medicine for Dementia National Center for Geriatrics and Gerontology Obu-shi Japan Division of Bio-function Dynamics Imaging Riken Center for Life Science Technologies (CLST) 6-7-3 Minatojima Minamimachi Kobe Japan Division of Regeneration and Advanced Medical Science Gifu University Graduated School of Medicine Gifu University Gifu Japan

The use of thallium(I) hydroxide (TlOH) as a base is known to extremely accelerate the Suzuki-Miyaura cross-coupling reaction using organoboronic acid or organoboronic acid ester as a substrate. Here, we investigated the effects of TlOH by comparing with other conventional bases such as KOH, K2CO3, and CsF for Pd0-mediated rapid cross-coupling reactions between CH3I and organoborane reagents, such as phenyl-, (Z)-4-benzyloxy-2-butenyl-, and benzylboronic acid pinacol esters under the conditions CH3I/borane/Pd0/base (1:40:1:3) in THF/H2O or DMF/H2O for 5 min with an aim to fabricate a PET tracer efficiently. Consequently, however, the use of TlOH was much less efficient than the other bases for the acceleration of cross-coupling reactions. Thus, it was reconfirmed that the milder and non-toxic conditions using K2CO3 or CsF so far developed by our group were most appropriate for the rapid C-methylations.

关键词： Synthesis of Short-Lived Positron Emission Tomography Probes Suzuki-Miyaura-Type Rapid Cross-Coupling Rapid C-Methylation TlOH

Classification of Emphysema Subtypes: Comparative Assessment of Local Binary Patterns and Related Texture Features

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Advances in Computed Tomography 2015年第3期4卷 47-55页

作者： Mizuho Nishio Hisanobu koyama Yoshiharu Ohno Kazuro Sugimura Division of Functional and Diagnostic Imaging Research Department of Radiology Kobe University Graduate School of Medicine Kobe Japan Advanced Biomedical Imaging Research Center Kobe University Graduate School of Medicine Kobe Japan Division of Radiology Department of Radiology Kobe University Graduate School of Medicine Kobe Japan

The purpose of this study was to assess usefulness of local binary patterns (LBP) and related texture features, namely completed local binary patterns (CLBP) and local ternary patterns (LTP), for the classification of emphysema subtypes on low-dose CT images. Fifty patients (34 men and 16 women;age, 67.5 ± 10.1 years) who underwent low-dose CT (60 mAs) were included. They were comprised of 17 never smokers, 13 smokers without COPD, and 20 smokers with COPD. By consensus reading of low-dose CT images from these patients, two radiologists selected 3681 nonoverlapping regions of interest (ROIs) and annotated them as one of the following three classes: normal tissue, centrilobular emphysema, and paraseptal emphysema. From these ROIs, histogram of CT densities, LBP, CLBP, and LTP were calculated, and the 3 types of texture histograms were concatenated with the CT density histogram. These 3 types of histograms (referred to as combined LBP, combined CLBP, and combined LTP) were used to classify ROI using linear support vector machine. For each type of the combined histogram, the accuracy of classification was determined by patient-based 10-fold cross validation. The best accuracy of combined LBP, combined CLBP, and combined LTP were 81.36%, 82.99%, and 83.29%, respectively. Compared to the classification accuracies obtained with combined LBP, those with combined LTP or combined CLBP were consistently improved. In conclusion, the results of this study suggest that, on low-dose CT, LTP and CLBP were more useful for the classification of emphysema subtypes than LBP.

关键词： Emphysema COPD Texture Analysis Low-Dose CT

A Loop Thermosyphon Type Cooling System for High Heat Flux

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Journal of Electronics Cooling and Thermal Control 2014年第4期4卷 128-137页

作者： Jiwon Yeo Seiya Yamashita Mizuki Hayashida Shigeru koyama Interdisciplinary Graduate School of Engineering Sciences Kyushu University Fukuoka Japan Faculty of Engineering Sciences Kyushu University Fukuoka Japan International Institute for Carbon-Neutral Energy Research (WPI-I2CNER) Kyushu University Fukuoka Japan

With rapid development of the semiconductor technology, more efficient cooling systems for electronic devices are needed. In this situation, in the present study, a loop thermosyphon type cooling system, which is composed mainly of a heating block, an evaporator and an air-cooled condenser, is investigated experimentally in order to evaluate the cooling performance. At first, it is examined that the optimum volume filling rate of this cooling system is approximately 40%. Next, four kinds of working fluids, R1234ze(E), R1234ze(Z), R134a and ethanol, are tested using a blasted heat transfer surface of the evaporator. In cases of R1234ze(E), R1234ze(Z), R134a and ethanol, the effective heat flux, at which the heating block surface temperature reaches 70°C, is 116 W/cm2, 106 W/cm2, 104 W/cm2 and 60 W/cm2, respectively. This result indicates that R1234ze(E) is the most suitable for the present cooling system. The minimum boiling thermal resistance of R1234ze(E) is 0.05 (cm2·K)/W around the effective heat flux of 100 W/cm2. Finally, four kinds of heat transfer surfaces of the evaporator, smooth, blasted, copper-plated and finned surfaces, are tested using R1234ze(E) as working fluid. The boiling thermal resistance of the blasted surface is the smallest among tested heat transfer surfaces up to 116 W/cm2 in effective heat flux. However, it increases drastically due to the appearance of dry-patch if the effective heat flux exceeds 116 W/cm2. On the other hand, in cases of copper-plated and finned surfaces, the dry-patch does not appear up to 150 W/cm2 in effective heat flux, and the boiling thermal resistances of those surfaces keep 0.1 (cm2·K)/W.

关键词： Cooling Boiling Loop Thermosyphon Grobal Warming Potential Thermal Resistance

An anomaly in persistent right umbilical vein of portal vein diagnosed by ultrasonography

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World Journal of Gastroenterology 2005年第8期11卷 1179-1181页

作者： Shigeo Nakanishi Katsuya Shiraki Kouji Yamamoto Mutsumi koyama Takeshi Nakano First Department of Internal Medicine Matsusaka Central General Hospital of Medicine

AIM: To detect the anomaly in the persistent right umbilical vein (PRUV) of portal vein (PV) with deviation of the ligamentum tere and left-sided ***: A total of 5783 candidates for routine analysis were evaluated for hepatic vascular abnormalities by ***: Ten candidates (0.17%) had a portal vein anomaly with a rightward-deviated ligamentum *** blood-flow velocity in the PRUV of the portal vein (17.7±3.0 cm/s) of the 10 cases was similar to that of the right anterior portal trunk (17.6±4.1 cm/s). However,the vessel diameter of the PRUV (ψ12.4±4.4 mm) was larger than the right anterior portal trunk (ψ6.1±0.9 mm).Therefore, flow volume in the anomalous portion (0.97±0.30 L/min) was more than that in the right anterior portal trunk (0.18±0.05 L/min).CONCLUSION: The anomaly plays an important role in intra-hepatic PV flow.

关键词：脐带血管超声检查肝门静脉胆囊韧带

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HLA与梅尼埃病相关性研究

国际耳鼻咽喉头颈外科杂志 1994年第4期18卷 230-231页

作者： koyama-S 刘巨波

Pseudo-Glaucoma after Hypertensive Retinopathy

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Open Journal of Ophthalmology 2013年第2期3卷 43-45页

作者： Katsunori Hara Masaki Tanito Yasurou koyama Akihiro Ohira Department of Ophthalmolgy Faculty of Medicine Shimane University Izumo Japan.

A 35-year-old Japanese woman showed the typical fundus appearance of acute hypertensive retinopathy, including multiple cotton-wool spots, retinal hemorrhages, star exudates, and disc edema bilaterally. Her systemic blood pressure was high (246/158 mmHg). Nephrologists diagnosed her with secondary hypertension due to immunoglobulin A nephropathy. After 2 years, all signs of acute retinopathy resolved and only multiple striated or sectorial darkening of the fundus (retinal nerve fiber layer defects [NFLD]) remained. Computerized analysis of the macular thickness measurement by optical coherence tomography alerted the risk of glaucoma. NFLD is a hallmark of early glaucoma that is more reliable than IOP elevations since normal tension glaucoma is popular in Japan. To differentiate this case from true glaucoma, information regarding her past history is critical for her future ophthalmologists.

关键词： Hypertensive Retinopathy Pseudo-Glaucoma Retinal Nerve Fiber Layer Defects (NFLD) Spectral-Domain Optical Coherence Tomography (SD-OCT)