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The Prize Collecting Steiner Tree (PCST) problem is one of the most important problems in the field of combinatorial optimization. In this paper, we consider new heuristics for the PCST problem. The heuristics consists of two stages. The first stage of the heuristics is to compute a spanning tree, which is based on the greedy approach. In the second stage of the heuristics, each arc in the spanning...
In this paper, we investigate the reproducibility of a fabrication method for making active microstructures as micro-actuators for optical and/or fluidic micro-components. The proposed method uses a magnetic photosensitive nanocomposite made by mixing magnetic nanoparticles into photoresist without laborious processes. In the development process, the magnetic particles are taken off from the nanocomposite,...
In recent years, static frequency converters (SFCs) have been utilized to start gas turbines in high-efficiency gas turbine combined cycle (GTCC) power plants. A gas turbine is started using a generator with a single-shaft arrangement that is rotated using the electric power fed from the SFC. Because the rotor position of the generator is important for controlling the SFC operation, a position sensor...
We have developed a novel method for arranging living cells on a glass chip with micrometer-scale cell-adhering areas by applying femtosecod laser. To form the cell-adhesion area, the chip surface was first covalently modified with perfluoroalkyl self-assembled-monolayer (Rf-SAM) and then etched by oxygen-plasma. The Rf-surface and the etched surface were characterized using solvent contact-angle...
In this paper, a novel parallel connection for direct sampling mixer (DSM) and its design method have been proposed. The transfer function of IIR in the conventional DSM can be designed only for the second order that leads to a poor skirt characteristics. To alleviate this problem, a parallel connection of DSM for the higher order of IIR has been proposed. By this structure, higher order of polynomials...
A charged-up insulator produces strong X-rays with a very narrow vacuum window between 0.03 and 0.04 Torr. Using this phenomenon, two types of compact X-ray emission tubes are made. Strong soft X-rays are observed when evacuating down to 0.04 Torr and applying a high voltage (0.5-5 kV) to these devices. The X-ray intensity is higher as the applied voltage is increased. A light-emitting phenomenon...
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