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Volume 52, Issue 12
Displaying 1-10 of 10 articles from this issue
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Paper
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—Cost Function Design for Distribution of Renewable Energy—Yu KAWANO, Koichiro TOMIYAMA, Toshiyuki OHTSUKA2016 Volume 52 Issue 12 Pages 653-660
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSWe formulate real-time pricing in electric power systems with renewable energy as a linear model predictive control (MPC) problem with inequality constraints and demonstrate that a small change in its performance index yields drastic changes in distributions of renewable energy over a power network. We consider electric power systems consisting of consumers, suppliers, generators, renewable energy, and an independent system operator (ISO) and assume that average of electricity generated by renewable energy can be predicted over a certain time interval in the future. Consumers and suppliers are modeled by demand curves and supply curves, respectively, derived from their utility functions and cost functions. The ISO can manipulate electricity prices in each area at each time point to stabilize load frequencies of generators, to maximize total benefits of consumers and suppliers, and to balance demands and supplies. To achieve these objectives, the current electricity prices are determined by real-time optimization to minimize a performance index over a finite future, which is formulated as a MPC problem. We examine two types of performance indices, and simulation results show that a small difference in the performance indices results in contrasting responses in distributions of renewable energy over the power network.View full abstractDownload PDF (836K) -
Taichi YAMADA, Akihisa OHYA2016 Volume 52 Issue 12 Pages 661-670
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSThis paper introduces a laser-scanner measurement model using the statistic of laser-scanner data collected in advance for a mobile robot localization. In autonomous navigation, robots usually run based on self position on a map, and laser-scanners are useful sensors for localization. However, in human living environments like urban areas and parks, laser-scanner data is unstable due to moving objects and natural objects, and it is difficult to obtain landmarks like fixed objects. Therefore, our method make a map using statistics of laser-scanner data and calculates the laser-scanner measurement model based on statistics. Our method is applied to Monte Carlo localization/particle filter. Because the map makes possible to use the frequency and distribution of laser-scanner data for localization, our method allows a robust localization for unstable laser scanner data. In extensive experiments, our method presented an accurate localization and a robot using our method ran stably in actual sidewalks.View full abstractDownload PDF (2692K) -
Kazuma WADA, Daisuke FUKUDA, Kazunori SAKURAMA2016 Volume 52 Issue 12 Pages 671-677
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSWe propose a masking method to protect the privacy of agent's state for distributed optimization. In the proposed method, each agent adds random signals to the own original state to conceal it. Moreover, each agent exchanges the added signals with each other and adds the received signals to the own state. By these steps, global information is correctly estimated even though some signals are deliberately added to conceal the agent's original state. Finally, to illustrate the effectiveness of the proposed method, we apply it to a microgrid and show that its demand-supply balance is kept via real-time pricing while protecting privacy of agent's original state.View full abstractDownload PDF (1371K) -
Ryutaro TOKUHIRO, Hiroshi DEGUCHI2016 Volume 52 Issue 12 Pages 678-689
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSThe appearance of the symptoms of excess cancer incidence and non-carcinogenic by pollutant is found in many people by a wide variety of degree. This reason is the difference of per day of pollutant exposure to risk indicators and sensitivity by age and sex. In particular, infants and school children in a growth phase, is called “the environment weakness”. In this study, we analysis exposure assessment representing the individual's lifestyle with different life action in every generation. Among them, we construct “lifestyle exposure model”. And this study focus Benzene and PM2.5 in specific area. Then we are explicit about exposure by breathing in generation and lifestyle.View full abstractDownload PDF (3337K) -
Morimasa OGAWA2016 Volume 52 Issue 12 Pages 690-697
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSThis paper provides a benchmark of model-based design method for temperature control of an industrial batch-cooling crystallizer. In order to control the crystallization temperature precisely, a process-model-based approach is employed for designing the control system. The designed control system is comprised of the PI-D cascade control with the feed-forward compensation. The derived PID settings formula is extremely suitable for tracking to the ramp set-point change. In addition, by partially slow down the set-point trajectory, the undershoot error of the temperature control can be significantly reduced. The simulation results of the designed control system shows superior control performance and proper applicability.View full abstractDownload PDF (2125K) -
Akio SUZUKI, Jun FUJIMOTO, Toshihiro ITOH, Ryutaro MAEDA2016 Volume 52 Issue 12 Pages 698-706
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSWe have developed sensor network using wireless sensor nodes in order to increase the convenience, safety and sustainability of society. We conducted small- and mid-scale experiments and improved the sensor network. To reveal the scale-dependent problems, a large-scale sensor network experiment was important. We conducted a power consumption monitoring experiment using wireless sensor nodes in 1987 convenience stores located in the Tohoku and the Chubu district for three years. The experiment started using 15896 button battery type wireless current sensors. The sensors were installed in stores' electrical distribution boards and current data were collected every ten second. We verified that sensors worked well in real store environments: average battery life was estimated over 550 days, average data receiving ratio was over 0.95. A battery maintenance operation revealed that battery replacement in excess of 10000 sensors was not practical in terms of cost. We developed a novel maintenance free wireless current sensor, which had a rechargeable battery charged via current from clamp type current transformers. All current sensors were replaced and we verified that new sensors worked well. Accuracy of power consumption data were investigated using artificial low data receiving ratio current data, the results showed that the power consumption monitoring network had practical accuracy.View full abstractDownload PDF (1519K) -
—Wireless Measurement of Temperature and Humidity Distributions in a Reel Oven—Kazuma KODAMA, Taro OZAKI, Akihiro MORIKAWA, Hiroyuki IYOTA, Tetsuo TS ...2016 Volume 52 Issue 12 Pages 707-712
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSSeveral types of ovens have been widely used for food processing and cooking. In this process, foods in an oven are heated by combination of heat transfers such as convection, conduction and thermal radiation. The quality of food products are affected by these heating conditions. In food factories, temperature inside the oven and baking time are adjusted by empirical human operations based on measured temperatures only at fixed-point. Therefore, it can be effective to measure the thermal environment where the food actually placed/moved in the process in real time. We have developed an electronic circuit board and a measuring device having wireless data communication function to measure the thermal environment parameters of temperature, humidity, wind speed, radiation contribution rate, vibration of the food inside the oven. We have performed the practical experiment with a reel oven working at food industry over 175°C for 1800s. The results show that the thermal environment nearby the food in the oven can be measured and temperature profiles also can be traced.View full abstractDownload PDF (2063K) -
Akira FUJII, Yuji GOTOH2016 Volume 52 Issue 12 Pages 713-720
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSIn the inspection of the steel wall of the tank in the petrochemical plant etc., it is necessary to detect the opposite-side defect from the surface of the steel wall. In this paper, the electromagnetic inspection method using static and alternating magnetic field is proposed. And, this method is investigated by verification experiment and 3-D nonlinear finite-element method (FEM) taking account of hysteresis (minor loop) and eddy current. It is shown that the detection of opposite-side defect is possible by the amplitude of minor loop of which the position on the hysteresis loop is affected by the existence of defect.View full abstractDownload PDF (2200K) -
Michio SANJOU, Takaaki OKAMOTO, Taiko-Paul KANEKO2016 Volume 52 Issue 12 Pages 721-726
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSThe present study developed autonomous-mobile floating-robot using one-board microcomputer Arduino which could measure automatically mean velocity in an open-channel flow. Camera tracking system and PID control method could make the robot remain the position against main stream, and then time-averaged streamwise velocity was evaluated reasonably by a duty-ratio of screw propeller motor. Reliable laboratory experiments with electromagnetic velocimetry provided the calibration curve that connects the duty-ratio and mean current velocity. Furthermore, the present floating could be found to move successfully in not only the laboratory flume but also in natural creek.View full abstractDownload PDF (1560K)
Short Paper
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Hiroyuki TAKANASHI, Tetsushi MIMURO, Michio HONGO, Akiko MISAWA, Yoich ...2016 Volume 52 Issue 12 Pages 727-729
Published: 2016
Released on J-STAGE: December 28, 2016
JOURNAL FREE ACCESSThis paper discusses the sway of center of gravity (CG) in upright posture. In a screening for scoliosis, it is preferable to keep subjects in upright posture during measurement. In the conventional Moiré topography techniques, a positioner which is inclined 10 degrees forward is used to keep the subjects at upright position. In this paper, we evaluate sway of the CG of human when supporting shoulder and/or pelvis by using the balance board used for gaming system. The effectiveness of supporting the pelvis is examined through the experimental data.View full abstractDownload PDF (713K)
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