http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kaoru Yamashita,Minoru Noda,Tomoya Yoshizaki,Masanori Okuyama 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
Sensitivity changes in piezoelectric-type ultrasonic microsensors have been investigated for variations in the layered structures in their diaphragms. The structure variations have been designed for sensitivity improvement in sensors having statically downward-deflected diaphragms to reduce lateral strain cancellation on their piezoelectric layer by enhancing the strain of the structural expansion component and by suppressing the strain of the bending component. The piezoelectric layer on the front side of the diaphragm has been removed around the top electrode to make slits with various widths. Silicon-dioxide and silicon layers on the rear side of the diaphragm have been removed entirely. These two variations in the structures have been analyzed for their effectiveness in sensitivity improvement, the modified sensor structures have been fabricated, and their sensitivity have been evaluated. Sensitivity changes in piezoelectric-type ultrasonic microsensors have been investigated for variations in the layered structures in their diaphragms. The structure variations have been designed for sensitivity improvement in sensors having statically downward-deflected diaphragms to reduce lateral strain cancellation on their piezoelectric layer by enhancing the strain of the structural expansion component and by suppressing the strain of the bending component. The piezoelectric layer on the front side of the diaphragm has been removed around the top electrode to make slits with various widths. Silicon-dioxide and silicon layers on the rear side of the diaphragm have been removed entirely. These two variations in the structures have been analyzed for their effectiveness in sensitivity improvement, the modified sensor structures have been fabricated, and their sensitivity have been evaluated.
Kaoru Yamashita,Akira Tsuchitani,Hideyuki Murakami,Masanori Okuyama,Shigeru Arita,Tsunehisa Tanaka,Yaowu Mo,Yoshihiko Suzuki 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.IV
Arrayed ultrasonic microsensors using piezoelectric PZT (Pb(Zr,Ti)O3) thin lms on micromachined silicon diaphragms have been fabricated and combined with BBD (Backet Brigade Device) for signal processing. The ultrasonic sensors are designed to compose an electrical phased array for three-dimensional object detection in air. The resonant frequencies of the elements were scattered in the error range of 12 % and the objects could not be detected due to the beat in the sum of delayed element waveforms. Each element has been tuned by adequate poling less than 10 V to make its resonant frequency equal to a center value. The frequency scattering was reduced within the range of 2 % and the tuned array could give the objects by summing up of the delayed signals. Three-dimensional object detection has been demonstrated using the tuned sensor combined with the BBD delay circuit.4
Kaoru Yamashita,M Okuyama,N Shimizu 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
Piezoelectric-type ultrasonic array sensors have been fabricated on micromachined diaphragm structures. A vibrating piezoelectric diaphragm has an inhomogeneity in induced charge distribution; charges in the central region and in the surroundings have opposite signs. These two charge signals can be summed up effectively by putting two kinds of electrodes for the regions and connecting the capacitors complementarily. Moreover, statically deflected diaphragms cause a larger lateral strain in piezoelectric layer than flat ones do. Combining these two effects, new sensors have been designed to have optimum electrodes for a complementary configuration on statically deflected diaphragms. The new sensor has shown sensitivity over five times higher than that of a conventional sensor.
Kaoru Suseki,Masaomi Yamashita,Yoshiaki Kojima,Yojiro Minegishi,Koichiro Komiya,Masashi Takaso 대한골다공증학회 2022 Osteoporosis and Sarcopenia Vol.8 No.4
Objectives: Many patients with osteoporotic fragile fracture often suffer from dysphagia that results in malnutrition, further deterioration of physical strength, and rehabilitation difficulties. This study aims to investigate the risk factors for dysphagia in hospitalized patients with osteoporotic vertebral and/or hip fractures. Methods: Between January 2020 and December 2021, 569 inpatients were managed for osteoporotic vertebral or hip fractures. Of these, 503 patients were analyzed and 66 were excluded as the required data could not be obtained or dysphagia with causative diseases such as cerebrovascular disease. The patients were divided into 2 groups: patients with dysphagia (P-group) and patients without dysphagia (N-group). We investigated gender, fracture site, age, systemic skeletal muscle mass index (SMI), bone mineral density (BMD), and body mass index (BMI) in early stage of hospitalization and studied their relationship with dysphagia. Results: There were no significant differences in gender and fracture site between the 2 groups. A significant difference was observed in age, SMI, BMD, and BMI (P < 0.01). We performed a logistic regression analysis with the P-group as the objective variable and age, SMI, BMD, and BMI as explanatory variables. We divided objective groups into all patients, patients with vertebral fracture, patients with hip fracture, men, and women. SMI was an independent risk factor in all groups. Conclusions: Lower SMI was a risk factor for dysphagia in hospitalized patients with osteoporotic vertebral and hip fractures. We carefully observed swallowing function of patients with decreased SMI to maintain the nutritional status and prevent rehabilitation difficulties.
Miniature Ultrasonic and Tactile Sensors for Dexterous Robot
Masanori Okuyama,Kaoru Yamashita,Minoru Noda,Masayuki Sohgawa,Takeshi Kanashima,Haruo Noma 한국전기전자재료학회 2012 Transactions on Electrical and Electronic Material Vol.13 No.5
Miniature ultrasonic and tactile sensors on Si substrate have been proposed, fabricated and characterized to detect objects for a dexterous robot. The ultrasonic sensor consists of piezoelectric PZT thin film on a Pt/Ti/SiO2 and/or Si diaphragm fabricated using a micromachining technique; the ultrasonic sensor detects the piezoelectric voltage as an ultrasonic wave. The sensitivity has been enhanced by improving the device structure, and the resonant frequency in the array sensor has been equalized. Position detection has been carried out by using a sensor array with high sensitivity and uniform resonant frequency. The tactile sensor consists of four or three warped cantilevers which have NiCr or Si:B+ piezoresistive layer for stress detection. Normal and shear stresses can be estimated by calculation using resistance changes of the piezoresitive layers on the cantilevers. Gripping state has been identified by using the tactile sensor which is installed on finger of a robot hand, and friction of objects has been measured by slipping the sensor.
Miniature Ultrasonic and Tactile Sensors for Dexterous Robot
Okuyama, Masanori,Yamashita, Kaoru,Noda, Minoru,Sohgawa, Masayuki,Kanashima, Takeshi,Noma, Haruo The Korean Institute of Electrical and Electronic 2012 Transactions on Electrical and Electronic Material Vol.13 No.5
Miniature ultrasonic and tactile sensors on Si substrate have been proposed, fabricated and characterized to detect objects for a dexterous robot. The ultrasonic sensor consists of piezoelectric PZT thin film on a Pt/Ti/$SiO_2$ and/or Si diaphragm fabricated using a micromachining technique; the ultrasonic sensor detects the piezoelectric voltage as an ultrasonic wave. The sensitivity has been enhanced by improving the device structure, and the resonant frequency in the array sensor has been equalized. Position detection has been carried out by using a sensor array with high sensitivity and uniform resonant frequency. The tactile sensor consists of four or three warped cantilevers which have NiCr or $Si:B^+$ piezoresistive layer for stress detection. Normal and shear stresses can be estimated by calculation using resistance changes of the piezoresitive layers on the cantilevers. Gripping state has been identified by using the tactile sensor which is installed on finger of a robot hand, and friction of objects has been measured by slipping the sensor.
Anti-tumor Immunity and Radioprotection Effect by Fuscoporia oblique
Yeunhwa Gu,Yuka Itokawa,Toshihiro Maenaka,Takenori Yamashita,Kenichiro Tanaka,Koru Tano,Hiroyo Kondo,Insuk Choi,Torao Ishida,Takashi Nakamura,Kiyoto Saito,Kaoru Terai,Hajime Monzen,Masami Oshima,Tetsu 한의병리학회 2005 대한동의병리학회 학술대회논문집 Vol.2005 No.8