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Hiroki Tanaka,Shimpei Matsusaki,Youichirou Baba,Yoshiaki Isono,Tomohiro Sase,Hiroshi Okano,Tomonori Saito,Katsumi Mukai,Tetsuya Murata,Hiroki Taoka 대한소화기내시경학회 2018 Clinical Endoscopy Vol.51 No.2
Background/Aims: It is sometimes difficult to distinguish between malignant and benign biliary strictures using imaging studiesalone, and pathological diagnosis is necessary. The aim of this study was to determine the usefulness of endoscopic transpapillary tissuesampling and factors predictive of diagnostic accuracy. Methods: From April 2008 to December 2014, 136 patients underwent endoscopic transpapillary tissue sampling for malignantbiliary strictures. The cytological and histological findings were reported as negative, suspicious, or positive. Suspicious and positivefindings were defined as pathologically positive. Results: The sensitivity was 65.0% for forceps biopsy, 49.5% for brush cytology, 46.2% for bile aspiration cytology, and 21.9% forendoscopic nasobiliary drainage cytology. The combination of these procedures improved the sensitivity (72.8%). Endoscopictranspapillary tissue sampling was more sensitive for lesions of biliary origin (91.4%) than for extrabiliary lesions (66.3%). In surgicalcases, the sensitivity for tumors with an infiltrative growth pattern (53.3%) was significantly lower than for a tumor with an expandingor intermediate growth pattern (87.5%). Conclusions: Combining procedures can improve diagnostic accuracy. It may be possible to predict the sensitivity of endoscopictranspapillary tissue sampling by evaluating the etiology and tumor growth pattern using preoperative imaging studies.
Oki, Yuichi,Tanaka, Toru,Takamiya, Koichi,Osada, Naoyuki,Nitta, Shinnosuke,Ishi, Yoshihiro,Uesugi, Tomonori,Kuriyama, Yasutoshi,Sakamoto, Masaaki,Ohtsuki, Tsutomu The Korean Association for Radiation Protection 2016 방사선방어학회지 Vol.41 No.3
Background: Very fine radiation-induced aerosol particles are produced in intense radiation fields, such as high-intensity accelerator rooms and containment vessels such as those in the Fukushima Daiichi nuclear power plant (FDNPP). Size measurement of the aerosol particles is very important for understanding the behavior of radioactive aerosols released in the FDNPP accident and radiation safety in high-energy accelerators. Materials and Methods: A combined technique using wire screens and imaging plates was developed for size measurement of fine radioactive aerosol particles smaller than 100 nm in diameter. This technique was applied to the radiation field of a proton accelerator room, in which radioactive atoms produced in air during machine operation are incorporated into radiation-induced aerosol particles. The size of $^{11}C$-bearing aerosol particles was analyzed using the wire screen technique in distinction from other positron emitters in combination with a radioactive decay analysis. Results and Discussion: The size distribution for $^{11}C$-bearing aerosol particles was found to be ca. $70{\mu}m$ in geometric mean diameter. The size was similar to that for $^7Be$-bearing particles obtained by a Ge detector measurement, and was slightly larger than the number-based size distribution measured with a scanning mobility particle sizer. Conclusion: The particle size measuring method using wire screens and imaging plates was successfully applied to the fine aerosol particles produced in an intense radiation field of a proton accelerator. This technique is applicable to size measurement of radioactive aerosol particles produced in the intense radiation fields of radiation facilities.
Monitoring of Hydrogen Sulfide from an Industrial Waste Landfill in Japan
( Noppharit Sutthasil ),( Tomonori Ishigaki ),( Yuka Ogata ),( Kazuto Endo ),( Masato Yamada ),( Masanao Nagamori ),( Osamu Oishi ),( Yoshinori Yabuki ),( Tanaka Hirokazu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1
Landfill management in Japan was developed more than Centuries. At industrial rapid growth era, numbers of waste were disposed with less control, such as co-disposal of Construction and Demolition waste (C&D waste) and organic Municipal Solid Wastes (MSW). Generally, Hydrogen sulfide (H<sub>2</sub>S) is detectable in ppm by human as odor, but more seriously it causes toxic effect in hundreds ppm. H<sub>2</sub>S is often generated in landfill containing sulfate source (such as gypsum board) and organic waste thorough the activity of the Sulfate Reducing Bacteria (SRB). This study was carried out to investigate the emission behavior and environmental parameters related to H<sub>2</sub>S generation in a landfill under aftercare phase, which has been disposed of C&D waste, and to develop the methodology to assess the environmental situation in landfills to be monitored. This survey was also involved in the project that aim to develop the methodology of appropriate management of the landfills. The objected landfill was located nearby the river and was operated by private sector. After the “standard of landfill disposal” regulation was enforced in Japan, this landfill was closed and started to monitoring. Figure 1 shows schematic of geological section of landfill, the area of dumping was mountainous, North and Eastern side of landfill was mounted to the hill called ‘Upper Zone’. South and Western side called ‘Lower Zone’. The slope of landfill surface was from upper to lower part. The approximate landfill surface is 4000 m<sup>2</sup>. Landfill investigation was conducted on October 2017. The location for measurement of surface gas emission by static chamber method was selected by grid placing. Soil gas concentration was measured by a gas analyzer and gas detecting tube. Water quality from landfill layer in monitoring well was analyzed in laboratory. The results show H<sub>2</sub>S gas was detected 5 out of 29 grid points from 0.7 m beneath cover soil in range 0.2-800 ppm. These H<sub>2</sub>S gas concentrations were related to surface H<sub>2</sub>S emissions which emitted in range 0.3-37.7 l/m<sup>2</sup>/d. The detected H<sub>2</sub>S emitted points were located at the lower zone of this landfill. In the same area, CH<sub>4</sub> emission were found in 10 out of 29 points in range 0.1-62.7 l/m<sup>2</sup>/d. H<sub>2</sub>S emission and CH<sub>4</sub> emission were negatively correlated. In contrast to the lower zone, CH<sub>4</sub> emission was detected at few points and no H<sub>2</sub>S gas was found at the upper zone. It is widely known that SRB and Methane Generating Bacteria inhabited or competitive of carbon source under anaerobic condition. Landfill gas results indicated that anaerobic degradation was comparably active in lower zone due to the existing of organic matter inside waste body. To compare biogas generation from lower and upper zone, CH<sub>4</sub> and CO<sub>2</sub> emissions from lower zone was about 10.1 and 3.2 times higher than that from upper zone, respectively. The higher degradation rate explain by the different amount of organic matter from upper to lower zone. Quality of inner water of landfill layer in the monitoring wells which located in lower zone were analyzed. The SO<sub>4</sub> concentration were in range 110-710 mg/l. Low concentration of dissolved oxygen (0.68 mg/l) and remaining of organic carbon (33.7 mg/l) were confirmed in inner water of landfill. These would possibly provide condition of H<sub>2</sub>S generation. From the result, landfill gas emission still active even the landfill already close for several years. It could suggest that the intensive and log-term monitoring program for this landfill must be necessary. It was also shown that the integration of monitoring of behavior of gas emission and dissolved component must be necessary to identify the practical situation of landfills, and to apply for future investigation in terms of improving the accuracy and simplification of methodology.
Fundamental Understanding of Nanoporous Carbons for Energy Application Potentials
Katsumi Kaneko,Miki Arai,Masahiro Yamamoto,Tomonori Ohba,Jun-Ichi Miyamoto,Dong-Young Kim,Yousheng Tao,Cheol-Min Yang,Kouki Urita,Toshihiko Fujimori,Hideki Tanaka,Takahiro Ohkubo,Shigenori Utsumi,Yosh 한국탄소학회 2009 Carbon Letters Vol.10 No.3
The importance of nanopore structures of carbons is shown in terms of interaction potential for various molecules including supercritical gases such as H2 and CH4. The key factors for adsorption of supercritical H2 and CH4 are shown for single wall carbon nanohorn, single wall carbon nanotube, and double wall carbon nanotube. The cluster formation of molecules is a key process for water adsorption on hydrophobic carbon nanopores. The X-ray absorption spectroscopic examination elucidates an explicit dehydration structure of ions confined in carbon nanopores.
Jothi Saravanan Thiyagarajan,Di Su,Hirofumi Tanaka,Boyu Zhao,Tomonori Nagayama 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.27 No.2
Condition monitoring of railway tracks is essential in guaranteeing the running safety of railways. Track profiles are the primary source of external excitation for a train system. While Track Recording Vehicle is often utilized for maintenance purposes, this particular vehicle is expensive and difficult to use for small railway operators. Therefore, track profile estimation through in-service vehicle response measurements, which potentially provides efficient and frequent measurement, has been studied. However, the quantitative evaluation of the vertical and lateral track profile irregularities is still challenging as the inverse analysis solutions are sometimes inaccurate and even unstable. In this paper, numerical analyses are first carried out to evaluate track profiles from acceleration and angular velocity responses measured on a train car body. For the inverse analysis, an Augmented State Kalman Filter is utilized to solve the problem using 4 degrees of freedom observable train models. The sensor installation locations are investigated through observability rank condition analysis with different measurement layout. Secondly, a field experiment is carried out in a local Japanese in-service railway network to estimate track profile from car body motions. Smartphones are utilized for the field test measurements as prevalent sensing devices. The effectiveness of the proposed approach is demonstrated with the observable train model. Numerical analyses and field experiments clarify the proposed track profile estimation’s capability using only one on-board sensing device.
Yoshiko Ramirez Ueno,Tsutomu Tamada,Satoru Takahashi,Utaru Tanaka,Keitaro Sofue,Tomonori Kanda,Munenobu Nogami,Yoshiharu Ohno,Nobuyuki Hinata,Masato Fujisawa,Takamichi Murakami 대한영상의학회 2018 Korean Journal of Radiology Vol.19 No.5
Computed diffusion-weighted MRI is a recently proposed post-processing technique that produces b-value images from diffusion-weighted imaging (DWI), acquired using at least two different b-values. This article presents an argument for computed DWI for prostate cancer by viewing four aspects of DWI: fundamentals, image quality and diagnostic performance, computing procedures, and future uses.
( Nobuyasu Awano ),( Minoru Inomata ),( Naoyuki Kuse ),( Mari Tone ),( Hanako Yoshimura ),( Tatsunori Jo ),( Kohei Takada ),( Chikatoshi Sugimoto ),( Tomonori Tanaka ),( Hiromitsu Sumikawa ),( Yuzo Su 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.-
Background: Idiopathic pulmonary fibrosis (IPF) is a progressive disease often accompanied by skeletal muscle wasting. We aimed to assess whether skeletal muscle mass and muscle attenuation on computed tomography (CT) are predictors of mortality in IPF patients using a nationwide cloud-based database and web-based multidisciplinary discussion (MDD) system. Methods: IPF patients diagnosed using MDD from April 2009 to March 2014 were included. We analyzed the cross-sectional area (CSA) of the erector spinae muscle (ESM<sub>CSA</sub>) and the pectoralis muscle (PM<sub>CSA</sub>), muscle attenuation of ESM (ESM<sub>MA</sub>), and PM (PM<sub>MA</sub>) on single-slice axial CT. Survival probability was assessed by the Kaplan-Meier method and compared by the log-rank test. Multivariate Cox proportional hazards models were performed to evaluate the relationship among the ESM<sub>CSA</sub>, PM<sub>CSA</sub>, ESM<sub>MA</sub>, PM<sub>MA</sub>, clinical parameters, and prognosis. Results: A total of 199 IPF patients were enrolled. Seventy-four patients died during the study period and the most frequent cause was acute exacerbation (13.1%). The group with the lowest quartile of ESMCSA had significantly worse survival than other groups (P = 0.009). Survival rates of the groups with the lowest quartile of PM<sub>CSA</sub>, lower ESM<sub>MA</sub>, and lower PM<sub>MA</sub> were not different from other groups. After multivariate analysis, ESM<sub>CSA</sub> < lower quartile was significantly associated with all-cause mortality (hazards ratio, 1.96; P = 0.030), whereas, ESM<sub>MA</sub> < median, PM<sub>CSA</sub> < lower quartile, and PM<sub>MA</sub> < median were not. Conclusions: Low ESM<sub>CSA</sub> on CT images may be a strong risk factor for all-cause mortality in IPF patients nationwide by MDD diagnosis.