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Wavelength Dependence of Photochemical Surface Modication of Silicone Rubber
Masayuki Okoshi,Minako Iyono,Narumi Inoue,Tsugito Yamashita 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
Photochemical surface modifications of silicone ([SiO(CH3)2]n) rubber have been successfully demonstrated by using various UV pulsed lasers; a 157-nm F2 laser and a 193-nm ArF and by using the 266-nm fourth harmonic of a Nd:YAG laser. The F2 laser modified silicone into transparent silica (SiO2). By switching the light source from a F2 laser to an ArF excimer laser or to the fourth harmonic of a Nd:YAG laser, we could modify the surface of the silicone rubber into a photoluminescent material or into amorphous carbon, respectively. Based on the photochemical modifications, micron-sized silica optical waveguides and white light sources could be integrated into a silicone rubber chip. Photochemical surface modifications of silicone ([SiO(CH3)2]n) rubber have been successfully demonstrated by using various UV pulsed lasers; a 157-nm F2 laser and a 193-nm ArF and by using the 266-nm fourth harmonic of a Nd:YAG laser. The F2 laser modified silicone into transparent silica (SiO2). By switching the light source from a F2 laser to an ArF excimer laser or to the fourth harmonic of a Nd:YAG laser, we could modify the surface of the silicone rubber into a photoluminescent material or into amorphous carbon, respectively. Based on the photochemical modifications, micron-sized silica optical waveguides and white light sources could be integrated into a silicone rubber chip.
Yasunobu Yamashita,Masayuki Kitano 대한소화기내시경학회 2024 Clinical Endoscopy Vol.57 No.2
Pancreatic cancers have a poor prognosis, and their incident rates have risen. Endoscopic ultrasonography (EUS) is an efficient and reliable diagnostic modality for pancreatic lesions, providing high spatial resolution. However, while EUS helps to detect minor pancreatic lesions, nearly all solid pancreatic lesions are hypoechoic, which creates difficulty in making differential diagnoses of pancreatic lesions. When diagnosing pancreatic lesions, the performance of image-enhanced EUS techniques is essential, such as EUS elastography or contrast-enhanced harmonic EUS (CH-EUS). CH-EUS diagnosis is based on assessing the vascularity of lesions, whereas tissue elasticity is measured via EUS elastography. Elastography is either strain or shear-wave, depending on the different mechanical properties being evaluated. The usefulness of enhanced EUS techniques is demonstrated in this review for the differential diagnosis of pancreatic lesions, including solid and cystic lesions, and pancreatic cancer staging.
Yasunobu Yamashita,Kensuke Tanioka,Yuki Kawaji,Takashi Tamura,Junya Nuta,Keiichi Hatamaru,Masahiro Itonaga,Takeichi Yoshida,Yoshiyuki Ida,Takao Maekita,Mikitaka Iguchi,Masayuki Kitano 거트앤리버 소화기연관학회협의회 2020 Gut and Liver Vol.14 No.5
Background/Aims: Rosemont classification (RC) with endoscopic ultrasonography (EUS) is important for diagnosing chronic pancreatitis (CP) but is based only on subjective judgement. EUS shear wave measurement (EUS-SWM) is a precise modality based on objective judgment, but its usefulness has not been extensively studied yet. This study evaluated the utility of EUS-SWM for diagnosing CP and estimating CP severity by determining the presence of endocrine dysfunction along with diabetes mellitus (DM). Methods: Between June 2018 and December 2018, 52 patients who underwent EUS and EUS-SWM were classified into two groups according to RC: non-CP (indeterminate CP and normal) and CP (consistent and suggestive of CP). The EUSSWM value by shear wave velocity was evaluated with a median value. The EUS-SWM value was compared with RC and the number of EUS features. The diagnostic accuracy and cutoff value of EUS-SWM for CP and DM and its sensitivity and specificity were calculated. Results: The EUS-SWM value significantly positively correlated with the RC and the number of EUS features. The EUS-SWM values that were consistent and suggestive of CP were significantly higher than that of normal. The area under the receiver operating characteristic (AUROC) curve for the diagnostic accuracy of EUS-SWM for CP was 0.97. The cutoff value of 2.19 had 100% sensitivity and 94% specificity. For endocrine dysfunction in CP, the AUROC was 0.75. The cutoff value of 2.78 had 70% sensitivity and 56% specificity. Conclusions: EUS-SWM provides an objective assessment and can be an alternative diagnostic tool for diagnosing CP. EUS-SWM may also be useful for predicting the presence of endocrine dysfunction.
A Study of Diversity Analysis Model Based on Embeddings for Cooking Recipes
Koutarou Yamashita,Fumiyo Ito,Kyosuke Hasumoto,Masayuki Goto 대한산업공학회 2023 Industrial Engineeering & Management Systems Vol.22 No.3
Recently, a large number of cooking recipes have been posted and shared on the Internet. Various machine learning techniques have been proposed to analyze those recipes. Those include a method to discover alternative ingredients by obtaining distributed representations from cooking procedures and ingredient names, or a method to extract basic procedures from common features in cooking procedures. Such methods utilize the constructed semantic space to calculate the distances among cooking procedures and ingredients for recipes, and demonstrate effectiveness by evaluating similarity of recipes. Using a similar semantic space, we can analyze not only the similarities among reci-pes but also their diversity. Even for the same dish name, there could be a variety of recipes, depending on the con-tributor. The diversity of recipes varies from dish to dish. By taking this diversity into account, it is possible to perform various analyses such as extracting recipes that are suitable for each user. In this study, we propose a method to ana-lyze the diversity of recipes using distributed representation. In addition, we apply the proposed method to the posted data on an actual recipe site and show its usefulness
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.
Tagawa, Hiroyuki,Miyamura, Tomoshi,Yamashita, Takuzo,Kohiyama, Masayuki,Ohsaki, Makoto Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.1
Detailed finite element (FE) analyses of a full-scale four-story steel frame structure, subjected to consecutive 60% and 100% excitations from the JR Takatori records during the 1995 Hyogoken-Nanbu earthquake, are conducted using E-Simulator. The four-story frame was tested at the largest shake-table facility in the world, E-Defense, in 2007. E-Simulator is a parallel FE analysis software package developed to accurately simulate structural behavior up to collapse by using a fine mesh of solid elements. To reduce computational time in consecutive dynamic time history analyses, static analysis with gravity force is introduced to terminate the vibration of the structure during the analysis of 60% excitation. An overall sway mechanism when subjected to 60% excitation and a story mechanism resulting from local buckling of the first-story columns when subjected to 100% excitation are simulated by using E-Simulator. The story drift response to the consecutive 60% and 100% excitations is slightly smaller than that for the single 100% excitation.
Seiji Ohtori,Masaomi Yamashita,Yasuaki Murata,Yawara Eguchi,Yasuchika Aoki,Hiromi Ataka,Jiro Hirayama,Tomoyuki Ozawa,Tatsuo Morinaga,Hajime Arai,Masaya Mimura,Hiroto Kamoda,Sumihisa Orita,Masayuki Miy 연세대학교의과대학 2014 Yonsei medical journal Vol.55 No.3
Purpose: To examine the effects of conservative and surgical treatments for nocturnalleg cramps in patients with lumbar spinal stenosis (LSS). Nocturnal leg cramps is frequently observed in patients with peripheral neuropathy. However, there have been few reports on the relationship between nocturnal leg cramps and LSS, and it remains unknown whether conservative or surgical intervention has an impact on leg cramps in patients with LSS. Materials and Methods: The subjects were 130 LSS patients with low back and leg pain. Conservative treatment such as exercise, medication, and epidural block was used in 66 patients and surgical treatmentsuch as decompression or decompression and fusion was performed in 64 patients. Pain scores and frequency of nocturnal leg cramps were evaluated based on self-reported questionnaires completed before and 3 months after treatment. Results: The severity of low back and leg pain was higher and the incidence of nocturnal leg cramps was significantly higher before treatment in the surgically treated group compared with the conservatively treated group. Pain scores improvedin both groups after the intervention. The incidence of nocturnal leg cramps was significantly improved by surgical treatment (p=0.027), but not by conservative treatment (p=0.122). Conclusion: The findings of this prospective study indicate that the prevalence of nocturnal leg cramps is associated with LSS and severity of symptoms. Pain symptoms were improved by conservative or surgicaltreatment, but only surgery improved nocturnal leg cramps in patients with LSS. Thus, these results indicate that the prevalence of nocturnal leg cramps is associatedwith spinal nerve compression by LSS.