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Search Results: 1 - 10 of 1103 matches for " Seiji Iida "
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Nonlinear Dynamic Analysis of Vowels in Cleft Palate Children with or without Hypernasality
Katsuaki Mishima,Hiroyuki Nakano,Tatsushi Matsumura,Norifumi Moritani,Seiji Iida,Yoshiya Ueyama
International Journal of Otolaryngology , 2012, DOI: 10.1155/2012/739523
Abstract: Objectives. To clarify the difference between Lyapunov exponents (LEs) for cleft palate (CP) patients with hypernasality versus without hypernasality and to investigate the relationship between their LEs and nasalance scores (NSs). Material and Methods. Six CP patients with severe hypernasality (mean age 9.2 years) and six CP patients without hypernasality (mean age 8.0 years) were enrolled. Five Japanese vowels were recorded at 44.1 KHz, and the NSs were measured simultaneously. The mean first LE (mLE1) from all one-second intervals was computed. Results. The mLE1 for /o/ in patients with hypernasality was significantly higher than that in patients without hypernasality. The correlation coefficients between the mLE1 and NS for all vowels were not statistically different. Conclusion. The voice signal of /o/ for the patients with hypernasality was more instable than in those without hypernasality. The chaotic phenomenon was independent of nasal resonance in CP voice.
Nonlinear Dynamic Analysis of Vowels in Cleft Palate Children with or without Hypernasality
Katsuaki Mishima,Hiroyuki Nakano,Tatsushi Matsumura,Norifumi Moritani,Seiji Iida,Yoshiya Ueyama
International Journal of Otolaryngology , 2012, DOI: 10.1155/2012/739523
Abstract: Objectives. To clarify the difference between Lyapunov exponents (LEs) for cleft palate (CP) patients with hypernasality versus without hypernasality and to investigate the relationship between their LEs and nasalance scores (NSs). Material and Methods. Six CP patients with severe hypernasality (mean age 9.2 years) and six CP patients without hypernasality (mean age 8.0 years) were enrolled. Five Japanese vowels were recorded at 44.1?KHz, and the NSs were measured simultaneously. The mean first LE (mLE1) from all one-second intervals was computed. Results. The mLE1 for /o/ in patients with hypernasality was significantly higher than that in patients without hypernasality. The correlation coefficients between the mLE1 and NS for all vowels were not statistically different. Conclusion. The voice signal of /o/ for the patients with hypernasality was more instable than in those without hypernasality. The chaotic phenomenon was independent of nasal resonance in CP voice. 1. Introduction Patients with cleft palate often exhibit nasality, which is a distinctive feature and an important target in speech therapy and rehabilitation. To evaluate velopharyngeal function, the aerodynamic and acoustic aspects of nasalization have been studied. An aerodynamic exam can diagnose the degree of velopharyngeal closure [1, 2], and acoustic measurements can categorize velopharyngeal insufficiency [3, 4]. The abnormal resonance generated by velopharyngeal insufficiency can be evaluated quantitatively using a nasometer [5]. On the other hand, the voice and speech of patients with cleft palates have been studied using many techniques including spectral analysis, perturbation analysis, and formant analysis. Zajac and Linville [6] and Lewis et al. [7] reported that cleft palate speakers have larger frequency perturbations (jitter) than normal controls. However, the methods used to calculate perturbations, jitter, and shimmer are only reliable for nearly periodic voice signals and cannot reliably analyze strongly aperiodic signals [8]. Recently, nonlinear dynamic methods have enabled the quantification of aperiodic and chaotic phenomena [9–11]. In our previous paper, we reported that the Lyapunov exponents (LEs) of the vowels /a/, /e/ and /o/ for adult cleft palate patients are higher than those for normal resonance adults and that there were no correlation coefficients between LEs and nasalance scores (NSs) [12]. These results suggested that vocal fold vibration may be less stable in adult cleft palate patients than in normal resonance subjects and that the LE may be a parameter
Hydrogen Production Using Reduced-Iron Nanoparticles by Laser Ablation in Liquids
Takehiro Okada,Taku Saiki,Seiji Taniguchi,Tsuyoshi Ueda,Kazuhiro Nakamura,Yusuke Nishikawa,Yukio Iida
ISRN Renewable Energy , 2013, DOI: 10.1155/2013/827681
Abstract: A recyclable energy cycle using a pulsed laser and base-metal nanoparticles is proposed. In this energy cycle, iron nanoparticles reduced from iron oxides by laser ablation in liquid are used for hydrogen generation. The laser energy can be stored in the base-metal nanoparticles as the difference between the chemical energies of iron oxide and iron. According to the results of an experiment on hydrogen production using the reduced iron nanoparticles, the reaction efficiency of the hydrogen generation at a temperature of 673?K was more than 94% for the ideal amount of generated hydrogen. 1. Introduction It has been expected that the application of hydrogen, produced by using clean, renewable energy, such as solar power, will solve the problem of global warming and depletion of fossil fuels. Many researches on hydrogen production have been conducted around the world [1–6]. Among them, the researches on generating hydrogen on the basis of the reaction of a metal with water are particularly interesting for the following reason: the method used to produce the hydrogen is very simple and low cost. Magnesium [2, 3], aluminum [4], and iron [5, 6] have already been used to generate hydrogen. Iron has the advantage of high safety in regard to handling because it hardly reacts with water at low temperature when compared to magnesium and aluminum. In some researches, metal nanoparticles were used to generate hydrogen [6]. It is important to increase the surface area of the metal particles by “micronizing” the particles to improve the reaction efficiency of metals with water. Moreover, the generated metal oxides should return to metals by reducing to realize an energy cycle. The metal oxides can be reduced to the metal and broken into nanoparticles by using pulsed-laser ablation in liquid [7–13]. This process consists of three steps: first, the metal oxide is heated to a high temperature in a short time by irradiating laser pulses onto a metal-oxide powder in the liquid. Second, after the laser pulse is irradiated, metal oxides are evaporated, and metals are atomized; the separated oxygen is rearranged as the outer shell of the metal particles. Third, after the metals are separated from their oxides near the irradiation point of the laser pulse, the metal atoms are aggregated by cooling, and nanoparticles are produced rapidly. As physical mechanisms, namely, the ablation mechanism of the metal oxide in the liquid, coulomb explosions [14, 15] and thermal ablation have been proposed. With this pulsed-laser ablation in liquid, high reduction efficiency is obtained
Performance Prospects of Fully-Depleted SOI MOSFET-Based Diodes Applied to Schenkel Circuit for RF-ID Chips  [PDF]
Yasuhisa Omura, Yukio Iida
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.42024
Abstract:

The feasibility of using the SOI-MOSFET as a quasi-diode to replace the Schottky-barrier diode in the Schenkel circuit is examined by device simulations primarily and experiments partly. Practical expressions of boost-up efficiency for d. c. condition and a. c. condition are proposed and are examined by simulations. It is shown that the SOI-MOSFET-based quasi-diode is a promising device for the Schenkel circuit because high boost-up efficiency can be gained easily. An a. c. analysis indicates that the fully-depleted condition should hold to suppress the floating-body effect for GHz-level RF applications of a quasi-diode.

Teachers’ and Teacher Students’ Conceptions of Learning and Creativity  [PDF]
Iida Vedenp??, Kirsti Lonka
Creative Education (CE) , 2014, DOI: 10.4236/ce.2014.520203
Abstract: The aim of this study was to explore what kinds of conceptions of creativity and learning Finnish teachers and teacher students expressed, and how these conceptions were related to the respondents’ epistemologies (conceptions of knowledge and learning). The participants (n = 89) answered an e-form, consisting of 3 open-ended questions (conceptions of learning, creativity and the connection between the two). In addition, there were 23 two-part Likert-type statements on epistemologies (Lonka et al., 2008) as well as 10 background questions. Mixed method approach was used to analyze the conceptions that the respondents’ expressed. Two qualitative categories of conceptions of learning came from previous research, Constructivity and active epistemology (Lonka, Joram, & Bryson, 1996). A new category also emerged: Collaborativity of learning. The answers about creativity were classified based on whether creativity was viewed as an inborn ability or something changeable, whether focus was on product or process, and whether creativity was seen as collaborative. The participants’ open-ended conceptions of learning reflected a view of learning as teacher-regulated assimilation, whereas their (structured) epistemologies higlighted reflection and deep-level learning. Creativity was viewed as something that can be improved, focusing on the collaborative process. A link between learning and creativity was identified. It shall be of interest to see, how such epistemic stands would be related to group work.
Package Licenses in Patent Pools with Basic and Optional Patents  [PDF]
Kenji Azetsu, Seiji Yamada
Modern Economy (ME) , 2013, DOI: 10.4236/me.2013.41002
Abstract: Patent pools are established by the patent holders in order to promote R & D and technological standards, etc. This paper investigates the patent holders’ incentive to form a patent pool, the patent pool’s licensing behavior, and the anticompetitive effect of a patent pool. Our model is characterized by the following two features. First, we consider the different two types of patent: basic and optional. Second, we consider a patent pool that offers two types of a package license: single and multiple. Our results yield some implications for a patent pool that is characterized by the complementarity between basic and optional patents.
Adverse Effects of Permanent Waving and Hair Relaxation—Assessment by Scanning Electron Microscopy (SEM)  [PDF]
Tokuya Omi,Seiji Kawana
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2013, DOI: 10.4236/jcdsa.2013.33a1007
Abstract: Permanent waving is very popular in Japan. Polypeptide chains (main chains) form the principal components of hair, and they are lined up longitudinally. Hair relaxation is also called straight permanent waving, and there are methods that change curly or wavy hair into straight hair. Hair damage as a result of winding, combing, and using high-temperature hairdressing irons is also often seen. By using scanning electron micrographs (SEM) we showed broken hairs and hair damage caused by permanent wave solutions. The hair damage is obvious when comparisons are made with the condition of the hair surface, condition of the cuticle, etc. Hair swelling by permanent wave solutions, manipulations such as winding, etc., inadequate rinsing with water, procedures on injured hair at the outset, etc., are considered possible reasons for any of these types of injury.
Adverse Effects of Permanent Waving and Hair Relaxation—Assessment by Scanning Electron Microscopy (SEM)  [PDF]
Tokuya Omi, Seiji Kawana
Journal of Cosmetics, Dermatological Sciences and Applications (JCDSA) , 2013, DOI: 10.4236/jcdsa.2013.33A1007
Abstract:

Permanent waving is very popular in Japan. Polypeptide chains (main chains) form the principal components of hair, and they are lined up longitudinally. Hair relaxation is also called straight permanent waving, and there are methods that change curly or wavy hair into straight hair. Hair damage as a result of winding, combing, and using high-temperature hairdressing irons is also often seen. By using scanning electron micrographs (SEM) we showed broken hairs and hair damage caused by permanent wave solutions. The hair damage is obvious when comparisons are made with the condition of the hair surface, condition of the cuticle, etc. Hair swelling by permanent wave solutions, manipulations such as winding, etc., inadequate rinsing with water, procedures on injured hair at the outset, etc., are considered possible reasons for any of these types of injury.

Planejamento estratégico situacional
Iida, Itiro;
Produ??o , 1993, DOI: 10.1590/S0103-65131993000200004
Abstract: the technique of situational strategic planning is presented in comparison with the traditional planning methods. this new method is applicable to complex systems, like social organizations, subjected to several types of uncertainties.
Novas aborgagens em seguran?a do trabalho
Iida, Itiro;
Produ??o , 1991, DOI: 10.1590/S0103-65131991000200001
Abstract: this paper presents a critical review of some traditional work conditions concepts, emphasing the "domino" theory and the personality with accident predisposition. the paper also shows the changes on the work conditions studies approach that have beginned in the seventies, due mainly to the better knowledge about the character of human fails, to the increased losse caused by severe accidentes and to the great changes occuredin the nature of the human work. the subject - work conditions safety - raises nowadays to a theme treated at the strategic level of the companies, being present among the other subjects assigned to company administration responsability, and also present in companies long term politics formulation.
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