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Object Learning Through Interaction with Person in the Context of Finding Lost Objects
Junji Takahashi,Ryuji Suzuki,Yoshito Tobe 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.6
This paper deals with machine learning through interaction with a person. We developed an interactive learning system (LTIP) by concentrating on a specific situation where a user and a robot cooperatively find a lost object in real world. The LTIP consists of a gathering candidate images process, a self-categorizing process based on SOM, and a cooperative and repeatable narrow down process so that the robotic system effectively learns the appearance of the target object that the user is looking for. We conducted several experiments to evaluate and analyze the process of interactive learning. We confirmed that preliminarily determining the effective features set for categorization is difficult. So our proposed LTIP scheme is useful for such a practical processes such as finding a lost object.
Plastic Anisotropy in Aluminium Drawn Tubes
Takahashi, Hiroshi,Moro, Junji,Tsuchida, Shin 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Developments of plastic anisotropy in aluminium tubes are investigated experimentally and theoretically. As-received drawn tubes are tensioned or twisted to get speciments having different anisotropies. The tubes are cut and extended into flat sheets. The surfaces are removed mechanically and electorochemically into half thickness. The anisotropy is evaluated by flow stress and r-value of tensile tests in various directions in a sheet. Crystallographic textures are detected by X-ray diffraction, from which crystal orientations are determined and then incorporated into the finite element polycrystal model. The predicted results of anisotropy by numerical tensile tests are compared with the above experiments. If a tube specimen is isotropic, its flow stress of simple torsion should be less than that of simple tension. However, the present as-received drawn tube shows the reverse tendency. This fact is confirmed theoretically on the basis of averaged anisotropy through thichness.
Rosyadi, Marwan,Takahashi, Rion,Muyeen, S.M.,Tamura, Junji Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
This paper present stabilization control of fixed speed wind generator by using variable speed permanent magnet wind generator in a wind farm connected with multi-machine power system. A novel direct-current based d-q vector control technique of back to back converter integrated with Fuzzy Logic Controller for optimal control configuration is proposed, in which both active and reactive powers delivered to a power grid system are controlled effectively. Simulation analyses have been performed using PSCAD/EMTDC. Simulation results show that the proposed control scheme is very effective to enhance the voltage stability of the wind farm during fault condition.
Endoscopic Findings and Treatment of Gastric Neoplasms in Familial Adenomatous Polyposis
Sato, Chihiro,Takahashi, Kazuya,Sato, Hiroki,Naruse, Takumi,Nakajima, Nao,Takatsuna, Masafumi,Mizuno, Ken-ichi,Hashimoto, Satoru,Takeuchi, Manabu,Yokoyama, Junji,Kobayashi, Masaaki,Terai, Shuji The Korean Gastric Cancer Association 2022 Journal of gastric cancer Vol.22 No.-
Purpose: Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods: A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results: Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs.Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions: Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis.
Endoscopic Findings and Treatment of Gastric Neoplasms in Familial Adenomatous Polyposis
Sato Chihiro,Takahashi Kazuya,Sato Hiroki,Naruse Takumi,Nakajima Nao,Takatsuna Masafumi,Mizuno Ken-ichi,Hashimoto Satoru,Takeuchi Manabu,Yokoyama Junji,Kobayashi Masaaki,Terai Shuji 대한위암학회 2022 Journal of gastric cancer Vol.22 No.4
Purpose Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs. Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis. Purpose Gastric neoplasia is a common manifestation of familial adenomatous polyposis (FAP). This study aimed to elucidate the clinical characteristics, endoscopic features including fundic gland polyposis (FGPsis), and treatment outcomes of gastric neoplasms (GNs) in patients with FAP. Materials and Methods A total of 35 patients diagnosed with FAP, including nine patients from four pedigrees who underwent esophagogastroduodenoscopy (EGD), were investigated regarding patient characteristics, GN morphology, and treatment outcomes. Results Twenty-one patients (60.0%) had 38 GNs; 33 (86.8%) and 5 (13.2%) were histologically diagnosed with adenocarcinoma and adenoma, respectively. There were no specific patient characteristics related to GNs. Nodule-type GNs were more prevalent in patients with FGP than without (52.2% vs. 0.0%, P=0.002) in the upper body of the stomach. Conversely, depressed-type GNs were fewer in patients with FGPsis than in those without (13.0% vs. 73.3%, P<0.001). Slightly elevated-type GNs were observed in both groups (34.8% vs. 20.0%, P=0.538). Even within pedigrees, the background gastric mucosa and types of GNs varied. In total, 24 GNs were treated with endoscopic submucosal dissection (ESD) and eight with endoscopic mucosal resection (EMR). EMR was selected for GNs with FGPsis because of the technical difficulty of ESD, resulting in a lower en bloc resection rate (62.5% vs. 100%, P=0.014). Conclusions Our study indicates the necessity of routine EGD surveillance in patients diagnosed with FAP. Notably, the morphology and location of GNs differed between patients with and without FGPsis. Endoscopic treatment and outcomes require more attention in cases of FGPsis.
Nakajima, Kyouhei,Umemura, Atsushi,Takahashi, Rion,Tamura, Junji Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.3
As a number of wind power generation systems have been installed in power systems in the world, frequency fluctuations due to output power variations from wind farms have become a serious problem. Battery systems have been studied for smoothing the output variations and decreasing the resulting frequency fluctuations. Among these studies, efficient design of battery systems is one of the most important subjects from a point of view of cost. This paper presents a comparative analysis of the smoothing effect between the conventional moving average method and a new method based on frequency response analysis.
Mitigation of Load Frequency Fluctuation Using a Centralized Pitch Angle Control of Wind Turbines
Junqiao, Liu,Rosyadi, Marwan,Takahashi, Rion,Tamura, Junji,Fukushima, Tomoyuki,Sakahara, Atsushi,Shinya, Koji,Yosioka, Kazuki Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
In this paper an application of centralized pitch angle controller for fixed speed wind turbines based wind farm to mitigate load frequency fluctuation is presented. Reference signal for the pitch angle of each wind turbine is calculated by using proposed centralized control system based on wind speed information. The wind farm in the model system is connected to a multi machine power system which is composed of 4 synchronous generators and a load. Simulation analyses have been carried out to investigate the performance of the controller using real wind speed data. It is concluded that the load frequency of the system can be controlled smoothly.
( Tatsuya Hayashi ),( Satoshi Saitoh ),( Kei Fukuzawa ),( Yoshinori Tsuji ),( Junji Takahashi ),( Yusuke Kawamura ),( Norio Akuta ),( Masahiro Kobayashi ),( Kenji Ikeda ),( Takeshi Fujii ),( Tosiaki M 대한간학회 2017 Gut and Liver Vol.11 No.5
Background/Aims: Noninvasive liver fibrosis evaluation was performed in patients with nonalcoholic fatty liver disease (NAFLD). We used a quantitative method based on the he-patic volume acquired from gadoxetate disodium-enhanced (Gd-EOB-DTPA-enhanced) magnetic resonance imaging (MRI) for diagnosing advanced fibrosis in patients with NAFLD. Methods: A total of 130 patients who were diagnosed with NAFLD and underwent Gd-EOB-DTPA-enhanced MRI were retrospectively included. Histological data were available for 118 patients. Hepatic volumetric parameters, including the left hepatic lobe to right hepatic lobe volume ratio (L/R ratio), were measured. The usefulness of the L/R ratio for diag-nosing fibrosis ≥F3-4 and F4 was assessed using the area under the receiver operating characteristic (AUROC) curve. Multiple regression analysis was performed to identify vari-ables (age, body mass index, serum fibrosis markers, and histological features) that were associated with the L/R ratio. Results: The L/R ratio demonstrated good performance in differentiating advanced fibrosis (AUROC, 0.80; 95% confi-dence interval, 0.72 to 0.88) from cirrhosis (AUROC, 0.87; 95% confidence interval, 0.75 to 0.99). Multiple regression analysis showed that only fibrosis was significantly associat-ed with the L/R ratio (coefficient, 0.121; p<0.0001). Conclu-sions: The L/R ratio, which is not influenced by pathologi-cal parameters other than fibrosis, is useful for diagnosing cirrhosis in patients with NAFLD. (Gut Liver 2017;11:674- 683)
Kang, Sungmin,Tokita, Masatoshi,Ogino, Kumiko,Doi, Takayuki,Takahashi, Takashi,Takezoe, Hideo,Watanabe, Junji Published by the American Physical Society through 2006 Physical review. E, Statistical, nonlinear, and so Vol.73 No.1
<P>A unique two-dimensional (2D) long-range structure has been observed in a low-temperature phase X1 for a banana molecule having bromine atom substituted on the central core using synchrotron radiation (SR) x-ray scattering measurements. The X1 phase is formed from the B2 phase with the SmC(A)P(A) structure upon cooling and then shows multiple reflections around the first layer line, which are interpreted as a peculiar frustrated structure with long-range layer modulation order. Furthermore, the observation of a well-defined (100) reflection with a spacing of 171A means that there is the electron density modulation along the layers. By coupling these reflections, a 2D lattice with a=173 A, c=53.4A, and beta=81.1 degrees, is determined where the a axis is parallel to the original layer of the phase. This unique structure with modulation can be interpreted as an undulated layer structure and suggested to be the result from deformation with polarization splay defects periodically occurring along the layer. The angle, beta=81.1 degrees, between a and c axes indicates that the position of splay defects in one layer is staggered from that in the neighboring layer. In other words, the splay defect lines run in a direction tilted by roughly 80 degrees with respect to the a axis.</P>