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Solar matching systems, which are specialized systems for use in sunlight-type plant factories, have recently been attracting significant attention. In such systems, filtered blue and red light, which are necessary for photosynthesis, are applied to plant growth, while the unneeded green light is used for electric power generation. Since accurate estimates of photovoltaic (PV) power generation amounts...
We developed a field management system with a field server that helps decrease farmers workload. It will be also enable the transfer of knowledge to the next generation of farmers in Japan. In order to reduce the burden of agricultural work, less frequent maintenance of the field server is desired. In this paper, we explain construction method of a local wireless network to cut the power consumption...
We investigated the millimeter-wave absorber integrated planar slot array antenna for a 120-GHz-band close proximity wireless system. Precise alignment and multiple reflection between Tx-Rx antennas become the problem for the application of >100-GHz-close-proximity wireless system. The millimeter-wave absorber integrated planar slot array antenna solves these problems. We adopted the split-ring...
Text segmentation is an important problem in document analysis related applications. We address the problem of classifying connected components of a document image as text or non-text. Inspired from previous works in the literature, besides common size and shape related features extracted from the components, we also consider component images, without and with context information, as inputs of the...
This paper presents a sensorless positioning control approach for piezo-actuated systems, using a simple external circuit. To achieve high-precision positioning with a piezoelectric actuator, a feedback control system using a high-resolution position sensor in incorporated, to cancel nonlinearities and disturbances. However, sensorless control is desirable to reduce cost and space utilization in micro-...
In this paper, we formulate an anchored alignment distance between rooted labeled unordered trees as the minimum cost of the anchored alignment whose anchoring is constructed from the minimum cost isolated-subtree mapping by adding the pairs of non-mapped leaves, and design the algorithm to compute it. Since this algorithm runs in exponential time with respect to the number of leaves in theoretical,...
This paper describes the prediction and prevention of losing steps in helical teethed linear actuator (HTLA) for artificial muscle. When the rapid external force is applied to the HTLA, it becomes a state of losing steps. Therefore, it is important to predict and prevent this phenomenon. First, we clarified the phenomenon of losing steps in the HTLA by using numerical simulation with 3-D FEM. Next,...
The pulse-echo method based on transmission of an ultrasonic pulse and time-of-flight determination of a reflected echo is one of the typical methods of ultrasonic distance measurement. To improve the SNR of the reflected echo, pulse compression using an M-sequence is employed in the pulseecho method. In the case of a moving object, however, the echo is modulated owing to the Doppler effect The Doppler-shifted...
A linear oscillatory actuator (LOA) for active control engine mounts (ACMs) is proposed in this paper. This LOA performs high thrust characteristics using a small size mover. Static and dynamic characteristics are computed through a coupled method of magnetic field and motion analyses employing 2-D finite element method. In addition, the effectiveness of proposed LOA is verified by the comparison...
A DC brushless linear motor is used for household automatic doors. However, it has a problem that the cost is high due to a large amount of permanent magnets in the mover. In order to solve this problem, we have studied a linear vernier motor which permanent magnets are used only in the stator. In this paper, we compare the thrust characteristics of the vernier motor with those of conventional linear...
Mobile haptic devices are being studied extensively because they have great potential for use as information transfer devices. Amemiya et al. proposed a method for haptic feedback with a slider-crank mechanism that uses an asymmetrical drive. We have recently proposed a haptic device that uses a small two degree-of-freedom (2-DOF) oscillatory actuator. Using this actuator, we have investigated the...
In pulse compression using an M-sequence, the M-sequence modulated signal is transmitted and the received signal is correlated with the transmitted signal. However, the M-sequence modulated signal reflected from a moving object is Doppler-shifted. The Doppler-shifted M-sequence modulated signal cannot be correlated with the transmitted signal. Therefore, Doppler velocity estimation from a cyclic M-sequence...
This paper proposes an evaluation method of vibration reduction for a linear oscillatory actuator using a fundamental frequency force. We have evaluated vibration reduction by the actuator through an experiment, but we did not evaluate it. Therefore we analyzed the frequency of the vibration waveform, and evaluated the vibration reduction of the first harmonic of the vibration waveform. As a result,...
This study analyzed the precision grip force for the underactuated gripper for power and precision grasp (uGRIPP). uGRIPP is a robot hand developed for dual arm manipulation. It can grasp objects through power and precision grips. For a more detailed analysis of the performance on the grip force and control of the grip force, a relationship was derived between the grip and actuation forces by using...
This paper proposes a novel load frequency control architecture based on differential games in energy supply-demand network integrating power networks and real-time electricity regulation markets. In order to establish the control architecture that each area minimizes his own cost independently on not only the electricity market layer but also the physical layer, we first present a novel load frequency...
Variability in the efficacy of transcranial direct-current stimulation (TDCS) may be affected by variations in electric fields, which depend on both experimental parameters and individual anatomical features of the head and brain. Electrode configurations that minimize inter-subject differences in electric fields would be useful for controlling variability in experimental TDCS studies. This study...
In this paper, first we formalize a feature selection problem based on binary consistency as a combinatorial optimization. Next, for the purpose of increasing the number of instances explained by the features rather than decreasing the number of features themselves in feature selection, we introduce an iterative feature selection based on binary consistency and design the algorithm for it. Finally,...
We found that heterogeneity of Ce:LiCaAlF6 single crystal grown by Czochralski (Cz) method. It was showed by measurement of multi-photon luminescence and it is due to Ce3+ ion by using LA-ICPMS. And we investigated the lasing properties of Ce:LiCaAlF6 at three areas with different concentration and distribution of Ce ion. As a result, the slope efficiency is highest and the lasing threshold is smallest...
In the field of aerospace engineering, gravity compensation of the prototype test is one of the crucial topics. The target of our research is to develop a prototype test system for deployable membrane space structures by using multi robots. In this study, a robotic supporting system for the spacecraft is proposed and is controlled by the force control so as to compensate gravity and deformation. The...
We present a new kernel on fuzzy sets: the Cross Product kernel on fuzzy sets. This kernel implements a similarity measure between fuzzy sets with a geometrical interpretation in Reproducing Kernel Hilbert Spaces. We prove that this kernel is a convolution kernel that generalizes the widely know kernel on sets towards the space of fuzzy sets. Moreover, we show that the Cross Product kernel on fuzzy...
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