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Self-assembly with Simple Robotic Agents
Kazuya Suzuki,Tsunamichi Tsukidate,Masahiro Shimizu,Akio Ishiguro 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
One of the most graceful phenomena widely observed in nature is self-assembly: living systems spontaneously assemble their body structure through the developmental process. Because of this case, we believe that the concept of self-assembly be comes undeniably indispensable in artificial systems as they in crease insize and complexity. Based on this consideration, we intend to deal with the emergent self-assembly with both explicit and implicit control mechanism and representd eveloped multi-robotic system that enables spontaneous self-assembly and self-repair of adamaged shape due to adisturbance input. Note that this study considers form generation by self-assembly as the result of the time evolution to ward the most dynamically stable state, i.e., the equilibrium state.
Maruyama, Toshiro,Miura, Akio,Yoshida, Tamao,Suzuki, Yoshihiro 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
Four kinds or chlorinated soultions were investigated to identify the causative substance(s) inhibiting the growth of Porphyra yezoensis thalli. The inhibitory effects were measured in terms of the length and the number of dead cells in Porphyra yezoensis thalli. Tests were conducted by cultures dosed chlorinated municipal sewage effluent, chlorinated ammonium solution, chlorinated municipal sewage effluent after nitrification and chlorinated ion exchanged water, respectively, each culture being subjected to shaking. Chlorinated municipal sewage effluent and chlorinated ammonium solution showed rather severe inhibitory effects on the growth of Porphyra yezoensis thalli as compared to chlorinated municipal sewage effluent after nitrification and chlorinated ion exchanged water. EC_20(10-day) values (in initial chlorine concentration) for chlorinated municipal sewage effluent, chlorinated ammonium solution and chlorinated ion exchanged water were 0.016 mg Cl2/l, 0.014-0.020 mg Cl2/l and 1.4 mg Cl2/l, respectively. The chlorinated municipal sewage effluent after nitrification did not show any adverse effects on the growth of Porphyra yezoensis thalli. It was determined that only mono-chloramine formed in both chlorinated municipal sewage effluent and chlorinated ammonium solution, and that no chloramine is present in both chlorinated effluent after nitrification and chlorinated ion exchanged water. Therefore, monochloramine was considered to be a causative substance to the growth of Porphyra yezoensis thalli. Above mentioned results suggest that complete nitrification is suitable measures to reduce the adverse effects of chlorinated municipal sewage effluent on the growth of Porphyra yezoensis thalli.
Nariai Yasuhiko,Takigawa Tomoji,Hyodo Akio,Suzuki Kensuke 대한신경중재치료의학회 2022 Neurointervention Vol.17 No.3
Endovascular treatment for wide-necked posterior communicating artery (PcomA) aneurysms with a fetal-type variant of the posterior cerebral artery (PCA) is often challenging. Since the complete occlusion rates achieved with the currently available treatment methods are unsatisfactory, we aimed to study the effectiveness of a double-balloon-assisted technique for these aneurysms. From September 2014 to August 2020, 6 consecutive patients with PcomA aneurysms with fetal-type PCAs and no previous treatment were treated with this technique at our institution (3 ruptured cases and 3 unruptured cases). The indication for this technique is that the neck of the aneurysm should significantly and broadly incorporate both the internal carotid artery and fetal-type PCA, such that a single-balloon remodeling and single stent would be inadequate to protect both the arteries. In all patients, the fetal-type PCAs were preserved without a stent and with adequate occlusion status. This double-balloon technique can be effective in the treatment of these aneurysms.
Experimental Study on Fire Hazard of Residential Fires Before and After Sprinkler Activation
Sekizawa,Ai,Yanai,Eiji,Takemoto,Akio,Kozeki,Daisuke,Suzuki,Keiko 한국화재소방학회 1997 한국화재소방학회 학술대회 논문집 Vol.1997 No.-
Fire experiments were conducted in a real scale room which is assumed to be a residential living room under the various opening conditions and locations of wood crib fire source to study on fire hazard before and after sprinkler activation. Concentrations of oxygen and carbon monoxide, smoke density, and temperature were measured to look into environmental conditions in a room of fire origin. The response time of residential sprinklers was also examined in relation to distance between sprinkler heads and a fire source.
Spin-wave eigenmodes in single disk-shaped FeB nanomagnet
Cho, Jaehun,Miwa, Shinji,Yakushiji, Kay,Tamaru, Shingo,Kubota, Hitoshi,Fukushima, Akio,Fujimoto, Satoshi,Tamura, Eiiti,You, Chun-Yeol,Yuasa, Shinji,Suzuki, Yoshishige American Physical Society 2016 Physical Review B Vol.94 No.18
<P>Spin-wave eigenmodes in a disk-shaped FeB nanomagnet were investigated using magnetic tunnel junctions with a FeB magnetic layer and MgO barrier. Noise spectrum measurements for a perpendicularly magnetized junction of 120 nm in diameter showed thermal excitation of distinct spin-wave modes. The measured spectra were compared with analytical calculations and numerical simulations. As a result, the observed modes were classified as spin-wave eigenmodes with various nodal circles and nodal diameter modes by taking into account splitting between directional spin-wave modes originating from dynamic dipolar interaction instead of Dzyaloshinskii-Moriya interaction. These results provide a fundamental understanding of spin dynamics in nanosize spintronic devices.</P>
Daisuke Ide,Tomohiko Richard Ohya,Mitsuaki Ishioka,Yuri Enomoto,Eisuke Nakao,Yuki Mitsuyoshi,Junki Tokura,Keigo Suzuki,Seiichi Yakabi,Chihiro Yasue,Akiko Chino,Masahiro Igarashi,Akio Nakashima,Masayuk 대한소화기내시경학회 2022 Clinical Endoscopy Vol.55 No.5
Background/Aims: Endoscopic submucosal dissection (ESD) for residual or recurrent colorectal lesions after incomplete resection is challenging because of severe fibrosis. This study aimed to compare the efficacy of the pocket-creation method (PCM) with a traction device (TD) with that of conventional ESD for residual or recurrent colorectal lesions. Methods: We retrospectively studied 72 patients with residual or recurrent colorectal lesions resected using ESD. Overall, 31 and 41 le- sions were resected using PCM with TD and conventional ESD methods, respectively. We compared patient background and treatment outcomes between the PCM with TD and conventional ESD groups, respectively. The primary endpoints were en bloc resection and R0 resection rates. The secondary endpoints were the dissection speed and incidence of adverse events. Results: En bloc resection was feasible in all cases with PCM with TD, but failed in 22% of cases of conventional ESD. The R0 resection rates for PCM with TD and conventional ESD were 97% and 66%, respectively. Dissection was significantly faster in the PCM with TD group (13.0 vs. 7.9 mm2/min). Perforation and postoperative bleeding were observed in one patient in each group. Conclusions: PCM with TD is an effective method for treating residual or recurrent colorectal lesions after incomplete resection.