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Development of an Advanced Wide-area Special Protection System
Nakajima, Akino,Morita, Makoto,Hayashi, Takuya,Takeyasu, Takatoshi,Kurose, Ken,Aramaki, Takuo,Kadokami, Atsushi 대한전기학회 2013 The Journal of International Council on Electrical Vol.3 No.4
As a countermeasure against the problem of frequency and dynamic stability caused by drops in a large capacity generator, a wide-area special protection system called the Block System Stabilizer (BSS) has been used for the last approx. 40 years by the Kansai Electric Power Company. The conventional BSS has been updated as the Bulk Power System Stabilizer. The new BSS has been developed based on the concept of improving fault detection functions, concomitant with changing the power system configuration from radial to loop, and thereby enhancing human operational functions.
Ryosuke Nakajima,Yuta Asano,Takuya Hida,Toshiyuki Matsumoto 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.1
This study focuses on adhered dirt such as dust on a product in production process, and considers the relationship between dirt levels of inspection surface and defect detection in visual inspection utilizing peripheral vision. Specifically, images of an inspection surface in an actual factory are analyzed using image analysis for modeling dirt. Moreover, dirt levels of inspection surface, defect locations, and defect characteristics (luminance contrast, size, and bright-dark defects) are designed as experimental factors, and their effect on defect detection rate is evaluated. As a result, it is clarified that the defect detection rate suddenly reduces as the inspection surface becomes dirtier. Consequently, the defects that can be detected easily becomes harder to detect, as the inspection surface is dirtier in visual inspection utilizing peripheral vision.
N=4 instanton calculus in <i>Ω</i> and R–R backgrounds
Ito, Katsushi,Nakajima, Hiroaki,Saka, Takuya,Sasaki, Shin Elsevier 2012 Nuclear physics, B Vol.860 No.2
<P><B>Abstract</B></P><P>We study the instanton calculus for N=4 super Yang–Mills theory in ten-dimensional <I>Ω</I>-background with the R-symmetry Wilson line gauge field. From the ADHM construction of instantons in the background, we obtain the deformed instanton effective action. For a certain case we get the effective action of N=<SUP>2⁎</SUP> theory in the <I>Ω</I>-background. We also study the low-energy effective D(−1)-brane action for the D3/D(−1)-brane system in the R–R 3-form field strength backgrounds and find that the action agrees with the instanton effective action in the <I>Ω</I>-background.</P>
Masaki Kubo,Takuya Hida,Ryosuke Nakajima,Toshiyuki Matsumoto 대한산업공학회 2019 Industrial Engineeering & Management Systems Vol.18 No.1
Many tasks are currently automated in the manufacturing field, but some are still performed by workers, which require technical knowledge and skills. However, it is difficult for a new worker to learn skills that require precise motion and extensive experience. Conventional on-the-job training (OJT) has a problem, which is the difficulty of defining and evaluating a correct task. Therefore, this study aimed to visualize the proper skills and their effects on quality in metallic painting operations, and to design the concept for a skill training system. Product quality depends on a worker’s motion and the effects of tools. To train a skill based on these factors, it is necessary to visualize the proper skill and to devise a method of training. Therefore, changes to a worker’s motion and the quality of products were visualized using a motion capture (MOCAP) system and three-dimensional computer graphics (3DCG) software. Furthermore, such a system requires a trainee to experience the proper motion and to evaluate his or her skills. The motion of two skilled workers was therefore analyzed to extract their skills as explicit knowledge. The skilled workers’ motion was measured using the MOCAP system. The obtained data were then analyzed as positional and rotational data in three axes for each motion of the main parts of the body. Consequently, 11 types of skills were extracted by analyzing the data. Then, an experiment was conducted to visualize the quality of the metallic painting operation using film thickness as an index. Seven factors for film thickness were extracted, and these were quantified in the experiment. Moreover, these factors were applied to 3DCG, and the film thickness was reproduced by simulation. As the result of a statistical test, the reproducibility of the film thickness was guaranteed in 3DCG. Based on the results, a training system was designed for to enable a new worker to learn the skill.
Qingyue Wang,Jun Morita,Xiumin Gong,Shinichi Nakamura,Miho Suzuki,Senlin Lu,Kazuhiko Sekiguchi,Takuya Nakajima,Daisuke Nakajima,Makoto Miwa 한국대기환경학회 2012 Asian Journal of Atmospheric Environment (AJAE) Vol.6 No.1
In this study, we characterized the physical form of allergenic Cry j 1 in the urban atmosphere. Through an immunofluorescence antibody method, we showed that allergenic Cry j 1 exists as fine particles (‹1.1μm). To determine Cry j 1 concentrations and its particle size distribution, we used the ELISA method to confirm that most Cry j 1 exists as fine particles in the urban atmosphere and is found at high concentrations on fine day next to rainy day. Furthermore,we evaluated Cry j 1 denaturation by using the Biacore J system based on the surface plasmon resonence (SPR) principle and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). We showed that the dissociation constant (KD) of Cry j 1 that has been exposed to urban polluted air is lower (1.76×10-14 M) than that of Cry j 1 (1.32×10-9-3.37×10-9 M) of original pollen grains that has not been exposed to air pollutants. Cry j 1 turns into low molecular weight proteins by reacting with various acidic solutions. In sum, we showed that allergenic Cry j 1exists as fine particles that can deposit in the lower respiratory tract. This finding clarifies the relationship between Japanese cedar pollinosis and air pollutants.