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Takashi Minemoto,Masashi Murata 한국물리학회 2014 Current Applied Physics Vol.14 No.11
The impact of the work function of a metal back contact on lead methylammonium tri-iodide based perovskite solar cells without hole transport material (HTM) was analyzed using device simulation. The elimination of the HTM is attractive in terms of the simplification of device structure and fabrication process. In the solar cell, a back junction is formed by the perovskite absorber and metal back contact. The device simulation revealed that the elimination of the HTM did not change the built-in voltage (Vbi) of the device when the work function of the metal back contact (fM) was similar to the valence band maximum of the absorber (Ev_absorber). In the HTM-free structure, Vbi showed a high value if fM was equal to or deeper than Ev_absorber. In contrast, when fM was shallower than Ev_absorber, Vbi monotonically decreased, resulting in the decrease in open-circuit voltage of the device. The results showed the importance of the fM matching to maintain Vbi, which is useful guideline for the design of the HTM-free perovskite solar cells.
A Proposal of Pictures Sharing Network Using Multicast with NAK
Wataru UEMURA,Masashi MURATA 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
At the wireless network, it is effective to decrease the packets in order to use the efficiency of the wireless band. We propose the multicast with NAK instead of the unicast in order to share the pictures which the cameras survillance system took at the parking lot.
Yuko Nishimoto,Masashi Takahashi,Kiyoshi Murata,Kimihiko Kichikawa 대한영상의학회 2005 Korean Journal of Radiology Vol.6 No.1
Objective: We wanted to clarify the relationship between the visibility of air cysts on CT images, the CT slice thickness and the size of the air cysts, with contact radiographs as the gold standard, for the accurate evaluation of honeycomb cysts. Materials and Methods: An inflated and fixed autopsied lung having idiopathic interstitial pneumonia was evaluated. The corresponding air cysts were identified on the contact radiographs of a 0.5 mm-thick-section specimen and also on the CT images of three different kinds of section thickness: 0.5, 1.0 and 2.5 mm. The maximal diameters of the air cysts were measured under a stereomicroscope. Results: A total of 341 air cysts were identified on the contact radiograph, and they were then evaluated. Sixty-six percent of air cysts 1 to 2 mm in diameter were detected by 0.5 mm slice thickness CT, while only 34% and 8% were detected by 1.0 and 2.5 mm slice thickness CT, respectively. Only 28% and 22% of air cysts less than 1 mm in diameter were detected by 0.5 and 1.0 mm slice thickness CT, respectively. CT with a 2.5 mm slice thickness could not demonstrate air cysts less than 1 mm in diameter. Conclusion: The CT detection rate of honeycombing is significantly influenced both by the slice thickness and the size of the air cysts.
Degradable Gelatin Microspheres as an Embolic Agent: an Experimental Study in a Rabbit Renal Model
Shinichi Ohta,Norihisa Nitta,Masashi Takahashi,Kiyoshi Murata,Yasuhiko Tabata 대한영상의학회 2007 Korean Journal of Radiology Vol.8 No.5
Objective: To investigate the basic characteristics of degradable gelatin microspheres (GMSs), including their embolic behavior and degradation periods when they are used as embolic materials in the renal arteries of rabbit models. Materials and Methods: Based on the GMS particle size, 24 kidneys were divided into 3 groups of eight kidneys, and each group was embolized with a different GMS particle size (group 1: 35 100 m, group 2: 100 200 m, and group 3: 200 300 m). From each group, two rabbits were sacrificed immediately after embolization (day 0), and a pair of rabbits from each group underwent an angiogram and were sacrificed on days 3, 7, and 14, respectively, after embolization. The level of arterial occlusion, the pathological changes in the renal parenchyma, and the degradation of the GMSs were evaluated angiographically and histologically. Results: A follow-up angiogram on days 0, 3, 7, and 14 revealed the presence of wedge-shaped poorly-enhanced areas in the parenchymal phase as seen in all groups. The size of these areas tended to increase with the particle diameter, and persisted up to day 14. On days 3, 7, and 14, parenchymal infarctions were observed histologically in all cases, and this observation corresponded with the parenchyma being supplied by the embolized arteries. GMSs of group 1 mainly reached the interlobular arteries, while those of group 3 mainly reached the interlobar arteries. In all but two cases, the GMSs were identified histologically even on day 14, and sequential degradation was histologically identified in all GMS groups. Conclusion: GMSs can be used as degradable embolic materials which can control the level of embolization.