All issues
Volume 48, Issue 5
Displaying 1-7 of 7 articles from this issue
- |<
- <
- 1
- >
- >|
Paper
-
—Influence of Heterogeneity of Consumer Utility—Nobutada FUJII, Toshiya KAIHARA, Tomoya YOSHIKAWA2012 Volume 48 Issue 5 Pages 249-256
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSService quality is often unstable because of the nature of service delivery systems involving humans. Furthermore, consumers cannot confirm the quality of service before purchase because service has no shape. For these reason, good service does not always diffuse. Therefore, it is necessary to study diffusion of service by computer simulations to clarify the process of acceptance among consumers. This paper presents a multiagent-based model for diffusion of plural services including heterogeneity of consumer utility in complex networks. It is verified that the heterogeneity of consumer utility and network structure affect service diffusion process in the results of computer simulations. In the result, it is revealed that the service that consumer utility is more heterogeneous wins in the competition in the market, but the diffusion rate lowers.View full abstractDownload PDF (605K) -
Gou NISHIDA, Masaki YAMAKITA2012 Volume 48 Issue 5 Pages 257-264
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSThis paper proposes a method of calculating a virtual Lagrangian for systems of partial differential equations that cannot be determined by standard Lagrangians. It is known that Lagrangians can be reconstructed from Euler-Lagrange equations by a homotopy operator. A homotopy operator is the dual operator of variational derivatives under a topological geometric assumption, called a vertically star-shaped. However, control systems are not always Euler-Lagrange equations, because of the dynamics of controllers and external forces. First, we introduce the concept of jet bundles to treat variational problems in a uniform way. Then we show that systems on vertically star-shaped regions with zero boundary conditions can be decomposed into two systems. One of them is a subsystem determined by virtual Lagrangians, which we call an exact subsystem, and the other is never introduced from calculus of variations, which we call a dual-exact subsystem. Next, we clarify the control input that turns given systems into exact systems, which we call an exactize control.View full abstractDownload PDF (405K) -
Yasuhiro MOCHIDA, Shigeru ANDO2012 Volume 48 Issue 5 Pages 265-272
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSA novel method for imaging velocimetry of range motion distribution is proposed. It is based on what we call “moire Doppler effect” and frequency estimation on each pixel. We project a grating pattern translating laterally with a constant speed. Every point on the object illuminated by it returns a sinusoidally varying intensity, and is detected by the Correlation Image Sensor (CIS). In this setup, a range motion of the object causes a frequency shift of the light intensity proportional to its velocity. We formulate this phenomena as the moire Doppler effect. The CIS can produce the Fourier coefficients of incoming light at up to three frequencies. From them, the frequency shift can be calculated by using the exact algebraic method, and thus the velocity can be estimated in each pixel. Several experiments were done to quantify the moire Doppler effect. A real-time measurement system was constructed which showed a feasible performance of the imaging velocimetry of range motion.View full abstractDownload PDF (1541K) -
—Output Value of Load Cell Is Proportioned to the Size—Hiroshi KONDO, Shigeo HONMA, Shuuichi KIMURA2012 Volume 48 Issue 5 Pages 273-279
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSLoading experiments were carried out by striking a weight against two column-type load cells of different size which were set up on the bases having different dynamic rigidities. The results showed a maximum output value appears when a large size load cell is set up on the large dynamic rigidity base, and a minimum value in a small size cell on the small rigidity base. The results stated above can be explained through a simulation based on the method of impedance which takes into account the multiple reflections of stress waves generated by the collision among the weight, the load cell and the setup base. Furthermore, increase of the load cell size results in a convergence of the output value, and the converged value is considered to be the dynamic load. Therefore, the dynamic load can be determined through experiments using different size of load cells of which output values are coincided. If output values are not coincided, the dynamic load can be estimated by regression using the data from an additional experiment with larger size load cell.View full abstractDownload PDF (2040K) -
Masaaki UEKI, Jian-Xin SUN, Kazunaga UEDA2012 Volume 48 Issue 5 Pages 280-284
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSIn order to achieve higher accuracy of the mass standard in the mass range equal to or less than 100g, it is necessary for a mass comparator in the range to have a relative sensitivity of the order of 1×10-9. For this purpose, a 111g capacity fully-automatic mass comparator has been renovated so that its readability is improved from 1 to 0.1µg. The mass comparator is also installed in an air-tight chamber originally developed by the NMIJ, so that it can be kept in stable environment, especially in the air of constant density. With these renovations, standard deviation of the mass comparisons is reduced and uncertainty of the air buoyancy corrections is lessened. This paper reports the features of the improved 100g mass comparator, the empirical method to evaluate its performance and the obtained results. As a result, the standard deviations of the mass difference measurements have been greatly improved to 0.22µg in the average with the chamber closed, compared with 0.97µg with the one open. The linearity of the comparator has been also verified by the mass difference measurements of weights at the six masses of 10, 20, 30, 50, 70 and 100g, and it confirms that the non-linearity errors of the comparator are within 0.28µg, showing good measuring performance.View full abstractDownload PDF (1594K) -
Masakazu TAKAHASHI, Reiji NANBA, Yoshinori FUKUE2012 Volume 48 Issue 5 Pages 285-294
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSThis paper proposes operational Risk Management (RM) method using Failure Mode and Effects Analysis (FMEA) for drug manufacturing computerlized system (DMCS). The quality of drug must not be influenced by failures and operational mistakes of DMCS. To avoid such situation, DMCS has to be conducted enough risk assessment and taken precautions. We propose operational RM method using FMEA for DMCS. To propose the method, we gathered and compared the FMEA results of DMCS, and develop a list that contains failure modes, failures and countermeasures. To apply this list, we can conduct RM in design phase, find failures, and conduct countermeasures efficiently. Additionally, we can find some failures that have not been found yet.View full abstractDownload PDF (2722K) -
Nobuyuki TANAKA, Mitsuru HIGASHIMORI, Makoto KANEKO2012 Volume 48 Issue 5 Pages 295-301
Published: 2012
Released on J-STAGE: June 14, 2012
JOURNAL FREE ACCESSNon-contact stiffness sensor is often utilized especially for medical fields due to its advantage of avoiding damage to tissues and keeping sanitary. However, it is hard to measure the force accurately, because the fluid jet based force much depends upon the shape after deformation of object. This paper proposes an innovative approach where the external force is adaptively calibrated based on the deformation of object so that we can evaluate the internal stiffness parameters more accurately than that of conventional approaches. It is shown that the proposed method can improve the accuracy of force application with even 100% at an extreme case.View full abstractDownload PDF (1594K)
- |<
- <
- 1
- >
- >|