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SEIGO ITO,TAKUROU N. MURAKAMI,SHAIK M. ZAKEERUDDIN,SUSUMU KAYAMA,MICHAEL GR€ ATZEL,Tetsuo Yazawa,MASAO MIZUNO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.5
Di®erent-sized nanocrystalline-TiO 2 particles have been used for the optimization of photovoltaice®ects of dye-sensitized solar cells (DSCs) using an ionic-liquid (IL) electrolyte. Ru dye (Z907)was used for the IL-DSC optimization. The TiO 2 nanoparticle sizes and the thickness of nano-crystalline-TiO 2 electrodes ranged from 13 nm to 81 nm and 2 ? m to 23 ? m, respectively. Theparticle size of the nanocrystalline TiO 2 ¯lm greatly a®ected the photovoltaic characteristics,particularly for the IL electrolyte due to limitation of the photocurrent by I?/I?3-di®usion. Theoptimized electrode for IL-DSC had a 15 ? m thickness using a 27 nm diameter of nanocrystalline-TiO 2 particles. In order to characterize the e®ect of the TiO 2 particle size on the photovoltaice®ects of IL-DSCs, a scanning electron micrograph (surface and cross section of nanoparticles),BET speci¯c surface area analysis, pore-size distribution analysis, photocurrent transient measurements, haze spectroscopy, photovoltaic measurements, incident-photon-to-currentconversion e±ciency spectroscopy and impedance measurement have been used.
Present Status of Endoscopic Submucosal Dissection for Non-Ampullary Duodenal Epithelial Tumors
Naomi Kakushima,Masao Yoshida,Yohei Yabuuchi,Noboru Kawata,Kohei Takizawa,Yoshihiro Kishida,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi,Hiroyuki Ono 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Prediction of histology by endoscopic examination is important in the clinical management of non-ampullary duodenal epithelial tumors (NADETs), including adenoma and adenocarcinoma. The use of a simple scoring system based on the findings of white-light endoscopy or magnified endoscopy with narrow-band imaging is useful to differentiate between Vienna category 3 (C3) and C4/5 lesions. Less invasive endoscopic resection procedures, such as cold snare polypectomy, are quick to perform and convenient for small (<10 mm) C3 lesions. Neoplasms with higher grade histology, such as C4/5 lesions, should be treated by endoscopic mucosal resection (EMR), endoscopic submucosal dissection (ESD), or surgery. Although EMR often requires piecemeal resection, the complication rate is acceptable. Excellent complete resection rates could be achieved by ESD; however, it remains a challenging method considering the high risk of complications. Shielding or closure of the ulcer after ESD is effective at decreasing the risk of delayed bleeding and perforation. Laparoscopic endoscopic cooperative surgery is an ideal treatment with a high rate of en bloc resection and a low rate of complications, although it is limited to high-volume centers. Patients with NADETs could benefit from a multidisciplinary approach to stratify the optimal treatment based on endoscopic diagnoses.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Tomohiro Iwai,Masao Yoshida,Hiroyuki Ono,Naomi Kakushima,Kohei Takizawa,Masaki Tanaka,Noboru Kawata,Sayo Ito,Kenichiro Imai,Kinichi Hotta,Hirotoshi Ishiwatari,Hiroyuki Matsubayashi 대한위암학회 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma.
Natural History of Early Gastric Cancer: a Case Report and Literature Review
Iwai, Tomohiro,Yoshida, Masao,Ono, Hiroyuki,Kakushima, Naomi,Takizawa, Kohei,Tanaka, Masaki,Kawata, Noboru,Ito, Sayo,Imai, Kenichiro,Hotta, Kinichi,Ishiwatari, Hirotoshi,Matsubayashi, Hiroyuki The Korean Gastric Cancer Association 2017 Journal of gastric cancer Vol.17 No.1
Early detection and treatment decrease the mortality rate associated with gastric cancer (GC). However, the natural history of GC remains unclear. An 85-year-old woman was referred to our hospital for evaluation of a gastric tumor. Esophagogastroduodenoscopy identified a 6 mm, flat-elevated lesion at the lesser curvature of the antrum. A biopsy specimen showed a well-differentiated tubular adenocarcinoma. The depth of the lesion was estimated to be intramucosal. Although the lesion met the indications for endoscopic resection, periodic endoscopic follow-up was performed due to the patient's advanced age and comorbidities. The mucosal GC invaded into the submucosa 3 years later, and finally progressed to advanced cancer 5 years after the initial examination. The patient died of tumor hemorrhage 6.4 years after the initial examination. In this case, mucosal GC progressed to advanced GC, eventually leading to the patient's death from GC. Early and appropriate treatment is required to prevent GC-related death.
The Development of the Totalized Hydrogen Energy Utilization System for Commercial Buildings
Maeda, Tetsuhiko,Nakano, Akihiro,Ito, Hiroshi,Tange, Manabu,Kawakami, Yoshiaki,Kato, Atsushi,Masuda, Masao The Korean Institute of Electrical Engineers 2011 The Journal of International Council on Electrical Vol.1 No.2
We have proposed the Totalized Hydrogen Energy Utilization System(THEUS) for applying to commercial buildings. THEUS consists of fuel cells, water electrolyzers, metal hydride tanks and their auxiliaries. We evaluated the energy saving of the basic THEUS in view of an actual operation using thermal demand data of actual buildings. The THEUS have ability for achieving energy saving, in comparison with an ice storage system for cooling demand. We have developed the hydrogen storage system using metal hydride and unitized reversible cell (URC) combine the functionality of a fuel cell and an electrolyzer in a single device, these are important components of THEUS. The metal hydride tank designed and manufactured to evaluate that we assumed actual operation in the experiments. We developed the numerical simulation code, and simulation results are in good agreement with experimental data. The simulation about two tanks system was done by using this code. The heat utilization can be improved greatly. To achieve URC commercial use, improvement of durability was examined. It confirmed that our URC had durability for several thousand hours.