All issues
Volume 45, Issue 2
Displaying 1-9 of 9 articles from this issue
- |<
- <
- 1
- >
- >|
Paper
Measurement
-
Hidemitsu OGAWA, Akihiro NAKANOWATARI, Katsuichi KITAGAWA, Masashi SUG ...2009 Volume 45 Issue 2 Pages 73-82
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSIn semiconductor and LCD manufacturing processes, film thickness and surface profiles of film-covered objects need to be measured simultaneously. We extend phase-shifting interferometry and propose an algorithm named the SOR (Separation of Object and Reference beams) method that enables such simultaneous measurement. The SOR method can be applied not only to thick films but also to thin films, which is an advantage over existing methods. We apply the SOR method to silicon substrates covered with SiO2 films and demonstrate its usefulness.View full abstractDownload PDF (996K) -
Yoji MASUI, Takanori MIYOSHI, Kazuhiko TERASHIMA2009 Volume 45 Issue 2 Pages 83-90
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSAn entirely novel shape measurement method to obtain 3D shapes is proposed, based on a bilateral vibration touch probe that outputs feedback voltage in accordance with its position. A bilateral vibration touch probe, with high-stiffness, is developed. The proposed probe consists of a piezo-electric device and a thin needle, and generates feedback voltage according to the relative distance from the object. The structure of this probe is simple, so that it is able to withstand high rates of acceleration during the measurement process. The shape measurement is performed in an object of unknown shape and the shape of the object can be found by scanning the object surface. Moreover, a nonlinear synchronous multi-axis control algorithm is proposed in order to scan the surface of arbitrary objects and measure their 3D shape. The effectiveness of the proposed algorithm is demonstrated through experiments. When actual width of 1 mm was measured using the proposed nonlinear synchronous multi-axis control, a minimum error of 21.7 µm was obtained.View full abstractDownload PDF (1817K) -
Yosuke KURIHARA, Yoshihiro KAWANISHI, Kajiro WATANABE, Kazuyuki KOBAYA ...2009 Volume 45 Issue 2 Pages 91-98
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSIn the graying Japanese society, monitoring health-related human data with sensors embedded in the living environment is quite meaningful in terms of emergency response and of long-term health management. In using the body data monitoring system daily at home, the lack of invasiveness during the monitoring and the maintenance of the system are of great importance. We have proposed the method to surmise the sleep stages of sleeping subjects by measuring the heartbeats and the respirations without invasiveness using the pneumatic method with an air mattress. This method, however, has a problem in the maintenance, since it requires periodic refilling of the air into the mattress. In this paper, another pneumatic method, which applies silicon tubes instead of the air mattress, is proposed. The change of S/N ratio in heartbeat and respiration signals, while having the environmental noises increased, are compared among a room with wooden flooring, another with tatami mats, a bath tub, and a toilet room. The result shows that both the pulse waves and the breaths can be measured with the accuracy of around 30dB, and the identification of each pulse from among the pulse waves is also feasible, under the condition that the environmental noises in the room with wooden flooring, that with tatami mats, the bath tub, and the rest room are 0.01G, 0.09G, 100ml, and 0.01G respectively.View full abstractDownload PDF (6448K)
Control
-
Manabu YAMADA, Masayoshi TOMIZUKA2009 Volume 45 Issue 2 Pages 99-104
Published: February 28, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSThis paper considers the problem of controlling both the planar position and orientation of an underactuated airship with a reduced number of actuators. The airship is a nonholonomic system described by a set of nonlinear equations. A smooth and time-varying coordinate transformation is utilized to reduce the stabilization problem of the airship to that of a simple linear time-invariant system. A new feedback controller is presented for obtaining global exponential stabilization of both the position and orientation of an underactuated airship. The proposed design method is simple and straightforward. Some flight experiments are performed to validate the effectiveness of the proposed controller.View full abstractDownload PDF (1775K) -
—Controller Design for Global Exponential Stabilization Specifying Convergent Rates—Manabu YAMADA, Koji MAHARA, Naoki MIZUNO2009 Volume 45 Issue 2 Pages 105-112
Published: February 28, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSThis paper considers the problem of controlling both the planar position and the direction of underactuated two-wheeled mobile robots with a reduced number of actuators for the case where some physical parameters are unknown but the upper bounds are known. The robot is a nonholonomic system described by a set of nonlinear equations. A new adaptive control system based on an on-line identification of the physical parameters is presented. A smooth and time-varying coordinate transformation is utilized to reduce the stabilization problem of the nonholonomic system to a well-known pole-placement problem of a linear time-invariant system. As a result, the proposed control system not only assures global exponential stabilization but also can specify the convergent rates of all the states. Moreover, the design method is simple and straightforward. Some simulations are performed to validate the effectiveness of the proposed controller.View full abstractDownload PDF (637K) -
With the SICE-DD Arm as an ExampleMasao ISHIKAWA, Yasuaki OISHI2009 Volume 45 Issue 2 Pages 113-119
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSIn this paper, design of a switching control law is discussed for a constrained nonlinear system with focus on the PD control of the SICE-DD arm. In particular, admissible sets for the given constraints are computed with sum-of-squares polynomials and then utilized for design of a switching rule. Since the technique of sum-of-squares polynomials requires large computational cost in general, a known Lyapunov function is used for reduction of the computational cost. Although this Lyapunov function includes trigonometric functions, they can be replaced by approximating polynomials so as to allow application of the sum-of-squares technique. A numerical example shows efficacy of the proposed method.View full abstractDownload PDF (401K)
System Integration
-
Yuichi OTSUKA, Tomotaka ABE, Hiroshi NOGUCHI, Akifumi MAKINOUCHI2009 Volume 45 Issue 2 Pages 120-126
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSThe necessity of an incident reporting system has recently been increasing for hospitals. Japan Council for Quality Health Care (JCQHC) started operating a national incident reporting system to which domestic hospitals would report their incidents. However, the reporting system obtained an additional problem for the hospitals. They managed their own systems which collected reports by papers. The purposes of the reporting systems was to analyze considerable causes involved in incidents to improve the quality of patient safety management. On the contrary, the national reporting system aimed at collecting a statistical tendency of normal incidents. Simultaneously operating the two systems would be too much workload for safety managers. The load may have the managers rest only a short time for summarizing occurrences, not enough for analyzing their causes. However, to the authors' knowledge, there has not been an integrating policy of the two forms to adapt them to practical situations in patient safety management. The scope of this paper is to establish the integrated form in order to use in analyzing the causes of incidents as well as reporting for the national system. We have developed new data base system using XML + XSLT and Java Servlet. The developed system is composed of three computers; DB server , DB client and Data sending server. To investigate usability of the developed system, we conducted a monitoring test by real workers in reporting workplaces. The result of subjective evaluations by examinees was so preferable for the developed system. The results of usability test and the achievement of increasing the number of reports after the introduction can demonstrate the enough effectiveness of the developed system for supporting the activity of patient safety management.View full abstractDownload PDF (1517K)
Advanced Integration
-
Hiroaki ISHIZAWA, Tsukasa MATSUO, Takashi MIKI2009 Volume 45 Issue 2 Pages 127-131
Published: February 28, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSThis paper describes a new measuring method of plant vigor by using Laser speckle pattern. Furthermore, this proposes a practical application of this presented measurement system. The measuring instrument is consisted by a He-Ne Laser as the light source, and a set of optics, such as reflectors, a beam expander. The speckle pattern could be measured by a CCD camera through lenses. A Pothos (Epiremnum aureum) and Japanese morning glory (Ipomoea nil) were used as the sample plant. Their intact leaves were measured the speckle pattern images. Visible but small vigor veins could be clearly observed in the images obtained by the speckle patterns. On the other hand, withered ones have shown different images. The relationship has been obtained between the feature of the images and the chlorophyll degradation. It would be expected that the symptom of plant against some stress could be detected by measuring the Laser speckle pattern. It could be used as the sensor of the field server system at every field monitoring site.View full abstractDownload PDF (3063K)
Short Paper
-
Takashi ASAKAWA, Kazue NISHIHARA, Tadashi YOSHIDOME2009 Volume 45 Issue 2 Pages 132-134
Published: February 01, 2009
Released on J-STAGE: November 02, 2011
JOURNAL FREE ACCESSWe propose a method of analyzing a finger pulse by standard deviation using moving average for measuring mental load. Frequency analysis, Lorentz plot and Lyapnov exponent have been carried out to present measurement. However, this technique is analyzable in a shorter time than the existing technique.View full abstractDownload PDF (345K)
- |<
- <
- 1
- >
- >|