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Ergonomic Approaches to Content Creation for 3D Displays
Kawai, Takashi,Kishi, Shinsuke,Kim, Sang-Hyun,Yamazoe, Takashi,Shibata, Takashi,Inoue, Tetsuri,Sakaguchi, Yusuke,Okabe, Kazushige,Yasuhiro, Kuno The Korean Infomation Display Society 2007 Journal of information display Vol.8 No.1
This paper presents ergonomic approaches to editing and evaluating content for 3D displays. Two systems, a nonlinear editing system and an evaluation system, were developed to improve viewing safety and comfort for 3D content observers and provide better usability for the creators from the viewpoint of ergonomics.
Fabrication of Slot-Antenna-Coupled BSCCO Intrinsic Josephson Junctions
Takashi Uchida,Noboru Kawai,Takashi Tachiki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
Coupling intrinsic Josephson junctions with a thin-.lm antenna is an eective method for realizing sensitive detectors and high-power oscillators in the millimeter- and submillimeter- wavelength regions. We investigated using a slot antenna as a thin-.lm antenna and fabricated slot-antenna-coupled Bi2Sr2CaCu2O8+x intrinsic Josephson junctions for 100 GHz millimeter waves. The antenna structure was designed for coupling the antenna ground plane with intrinsic Josephson junctions of a four-terminal con.guration. The ground plane of the antenna also acts as an electrode. Therefore, the ground plane was divided into four electrodes by making four DC cuts and extended electrodes were used to connect the electrodes to intrinsic Josephson junctions. Then, slot-antenna-coupled intrinsic Josephson junctions were fabricated on MgO substrates. The antenna ground plane consisted of a Au .lm. The current-voltage characteristics of the intrinsic Josephson junctions exhibited resistive branches with the critical current of about 1.5 mA at 20 K. Operation of the antenna was con.rmed on the basis of the dierence of 7.8 dB in the irradiation power when the critical current started to be suppressed between the cases with the incident electric .eld respectively parallel and perpendicular to the E-plane of the antenna.
Electrical Activation of Boron in Si Film Using Excimer Laser Annealing
Takashi Noguchi,Masateru Sato,Tomoyuki Miyahira,Kenji Kawai,Toshiharu Suzuki 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1
After UV (ultra-violet) pulsed ELA (excimer laser annealing) for highly-boron doped Si films, the conductivity and the correlated crystallinity in the lm were evaluated by comparing them with the case of SPC (solid phase crystallization) in a furnace chamber at the temperature below 650 ℃. The sheet resistance decreases drastically with improving crystallinity by performing ELA. By optimizing the ELA conditions, ecient solidied activation after melting occurs and the Si film with a 50 nm thickness shows an extremely low sheet resistance of 50 ohm/□ at a dose of 5 × 10<SUP>15</SUP> cm<SUP>-2</SUP>. The analytical result from the Hall measurement suggests that the drastic activation after ELA is due to the high carrier concentration, which relates to the higher crystallinity. ELA activation for heavily-impurity-incorporated Si lms is eective not only for the formation of the source and the drain or the Si gate in CMOS (complementary metal oxide semiconductor) TFTs (thin-film transistors) but also for the electrode in pin photo-sensor diodes for SoP (system on panel) and solar cell applications.
Nano-scale current voltage characteristics of thin film solar cell with light irradiations
Masato Kawai,Tomohiro Kawakami,Tomoya Inaba,Fumitaka Ohashi,Hironori Natsuhara,Takashi Itoh,Shuichi Nonomura 한국물리학회 2010 Current Applied Physics Vol.10 No.3
Nano-scale current voltage (I–V) characteristics of hydrogenated amorphous silicon (a-Si:H) solar cells were studied with and without light irradiations by using conductive Atomic Force Microscope (conductive-AFM). To obtain proper I–V characteristics, electrical contacts between the n-layer of the a-Si solar cells and the cantilever of the AFM were modified by depositing ZnO films with the thickness of 20 nm on the tip using DC sputterer. The I–V characteristics were changed from Schottky like to ohmic like. Surface defects and grain boundaries of the ZnO thin film possibly formed an ohmic-like current path between n-layer and the tip of the cantilever. We measured photo-current map at the bias of -2 V with a resolution of nano-meter scales. High photo-current paths appeared at nano-crystallites formed in the nc-Si:H film of the solar cell while small current area was observed at the boundaries of the small and large grains. This suggests that the boundaries have high impedance created by hydrogen passivation or act as a leakage current path for the photo-current recombination. These results imply that our proposed measurement technique using conductive-AFM combined with covering of ZnO film on the cantilever is a useful tool for the evaluation of the short path of the photo-current. In addition, these techniques contribute to increase the conversion efficiency of thin film solar cells.
Hindcasting of Storm Surge at Southeast Coast by Typhoon Maemi
HIROYASU KAWAI,DO-SAM KIM,YOON-KOO KANG,TAKASHI TOMITA,TETSUYA HIRAISHI 한국해양공학회 2005 韓國海洋工學會誌 Vol.19 No.2
Typhoon Maemi landed on the southeast coast of Korea and caused a severe storm surge in Jinhae Bay and Masan Bay. The tide gage in Masan Port recorded the storm surge of a maximum of more than 2m and the area of more than 700m from the Seo Hang Wharf was flooded by the storm surge. They had not met such an extremely severe storm surge since the opening of the port. Then storm surge was hindcasted with a numerical model. The typhoon pressure was approximated by Myers' empirical model and super gradient wind around the typhoon eye wall was considered in the wind estimation. The land topography surrounding Jinhae Bay and Masan Bay is so complex that the computed wind field was modified with the 3D-MASCON model. The motion of seawater due to the atmospheric forces was simulated using a one-layer model based on non-linear long wave approximation. The Janssen's wave age dependent drag coefficient on the sea surface was calculated in the wave prediction model WAM cycle 4 and the coefficient was inputted to the storm surge model. The result shows that the storm surge hindcasted by the numerical model was in good agreement with the observed one.
Significance of rescue hybrid endoscopic submucosal dissection in difficult colorectal cases
Hayato Yamaguchi,Masakatsu Fukuzawa,Takashi Kawai,Takahiro Muramatsu,Taisuke Matsumoto,Kumiko Uchida,Yohei Koyama,Akira Madarame,Takashi Morise,Shin Kono,Sakiko Naito,Naoyoshi Nagata,Mitsushige Sugimo 대한소화기내시경학회 2023 Clinical Endoscopy Vol.56 No.6
Background/Aims: Hybrid endoscopic submucosal dissection (ESD), in which an incision is made around a lesion and snaring is per-formed after submucosal dissection, has some advantages in colorectal surgery, including shorter procedure time and preventing per-foration. However, its value for rescue resection in difficult colorectal ESD cases remains unclear. This study evaluated the utility of res-cue hybrid ESD (RH-ESD). Methods: We divided 364 colorectal ESD procedures into the conventional ESD group (C-ESD, n=260), scheduled hybrid ESD group(SH-ESD, n=69), and RH-ESD group (n=35) and compared their clinical outcomes. Results: Resection time was significantly shorter in the following order: RH-ESD (149 [90–197] minutes) >C-ESD (90 [60–140] min-utes) >SH-ESD (52 [29–80] minutes). The en bloc resection rate increased significantly in the following order: RH-ESD (48.6%), SH-ESD (78.3%), and C-ESD (97.7%). An analysis of factors related to piecemeal resection of RH-ESD revealed that the submucosal dis-section rate was significantly lower in the piecemeal resection group (25% [20%–30%]) than in the en bloc resection group (40% [20%–60%]). Conclusions: RH-ESD was ineffective in terms of curative resection because of the low en bloc resection rate, but was useful for avoid-ing surgery.