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Search Results: 1 - 10 of 34 matches for " Junki Manai "
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Microfluidic Analytical System with On-Line Luminol Chemiluminescence Detection Based on Annular Flow of Phase Separation Multiphase Flow  [PDF]
Junki Manai, Kei Nishiyama, Kazuhiko Tsukagoshi
Journal of Analytical Sciences, Methods and Instrumentation (JASMI) , 2017, DOI: 10.4236/jasmi.2017.72003
Abstract: Microfluidic analytical system was developed based on annular flow of phase separation multiphase flow with a ternary water-hydrophilic/hydrophobic organic solvent solution. The analytical system was combined with on-line luminol chemiluminescence detection for catechin analysis. The water (10 mM phosphate buffer, pH 7.3)-acetonitrile-ethyl acetate mixed solution (3:8:4, volume ratio) containing 60 μM luminol and 2 mM hydrogen peroxide as a carrier was fed into the capillary tube (open-tubular fused-silica, 75 μm inner diameter, 110 cm effective length) at a flow rate of 1.0 μL·min-1. The carrier solution showed stable chemiluminescence as a baseline on the flow chart. Eight catechins were detected as negative peaks for their antioxidant potential with different detection times. The system was applied to analyze the amounts of catechin in commercially available green tea beverages.
New Approach for Hardware/Software Embedded System Conception Based on the Use of Design Patterns  [PDF]
Yassine Manai, Joseph Haggège, Mohamed Benrejeb
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.36060
Abstract: This paper deals with a new hardware/software embedded system design methodology based on design pattern approach by development of a new design tool called smartcell. Three main constraints of embedded systems design process are investigated: the complexity, the partitioning between hardware and software aspects and the reusability. Two intermediate models are carried out in order to solve the complexity problem. The partitioning problem deals with the proposed hardware/software partitioning algorithm based on Ant Colony Optimisation. The reusability problem is resolved by synthesis of intellectual property blocks. Specification and integration of an intelligent controller on heterogeneous platform are considered to illustrate the proposed approach.
New Approach of Stability for Time-Delay Takagi-Sugeno Fuzzy System Based on Fuzzy Weighting-Dependent Lyapunov Functionals  [PDF]
Yassine Manai, Mohamed Benrejeb, Pierre Borne
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.211187
Abstract: This paper deals with the stability of Takagi-Sugeno fuzzy models with time delay. Using fuzzy weighting- dependent Lyapunov-Krasovskii functionals, new sufficient stability criteria are established in terms of Linear Matrix Inequality; hence the stability bound of upper bound delay time can be easily estimated. Finally, numeric simulations are given to validate the developed approach.
Robust Stabilization for Continuous Takagi-Sugeno Fuzzy System Based on Observer Design
Yassine Manai,Mohamed Benrejeb
Mathematical Problems in Engineering , 2012, DOI: 10.1155/2012/836814
Abstract: This paper investigates the influence of a new parallel distributed controller (PDC) on the stabilization region of continuous Takagi-Sugeno (T-S) fuzzy models. Using a nonquadratic Lyapunov function, a new sufficient stabilization criterion is established in terms of linear matrix inequality. The criterion examines the derivative membership function; an approach to determine state variables is given based on observer design. In addition, a stabilization condition for uncertain system is given. Finally, numeric simulation is given to validate the developed approach.
New Condition of Stabilization of Uncertain Continuous Takagi-Sugeno Fuzzy System based on Fuzzy Lyapunov Function
Yassine Manai,Mohamed Benrejeb
International Journal of Intelligent Systems and Applications , 2012,
Abstract: This paper deals with the stabilization of Takagi-Sugeno fuzzy models. Using non-quadratic Lyapunov function, new sufficient stabilization criteria with PDC controller are established in terms of Linear Matrix Inequality. Finally, a stabilization condition for uncertain system is given.
Trimer Formation and Metal-Insulator Transition in Orbital Degenerate Systems on a Triangular Lattice
Junki Yoshitake,Yukitoshi Motome
Physics , 2011, DOI: 10.1143/JPSJ.80.073711
Abstract: As a prototypical self-organization in the system with orbital degeneracy, we theoretically investigate trimer formation on a triangular lattice, as observed in LiVO2. From the analysis of an effective spin-orbital coupled model in the strong correlation limit, we show that the previously-proposed orbital-ordered trimer state is not the lowest-energy state for a finite Hund's-rule coupling. Instead, exploring the ground state in a wide range of parameters for a multiorbital Hubbard model, we find an instability toward a different orbital-ordered trimer state in the intermediately correlated regime in the presence of trigonal crystal field. The trimer phase appears in the competing region among a paramagnetic metal, band insulator, and Mott insulator. The underlying mechanism is nesting instability of the Fermi surface by a synergetic effect of Coulomb interactions and trigonal-field splitting. The results are compared with experiments in triangularlattice compounds, LiVX2 (X=O, S, Se) and NaVO2.
Gamma Radiation Measurements in Tunisian Marbles  [PDF]
Kais Manai, Chiraz Ferchichi, Mansour Oueslati, Adel Trabelsi
World Journal of Nuclear Science and Technology (WJNST) , 2012, DOI: 10.4236/wjnst.2012.23013
Abstract: The radioactivity of 15 kinds of different granites collected in Tunisia was determined by gamma-ray spectrometry using hyper-pure germanium (HPGe) detector. The average activity concentrations for primordial radionuclides 238U, 232Th and 40K were respectively 33.24, 8.01 and 116.98 Bq/kg. The activity concentrations ranged from 3.59 to 87.37 Bq/kg for 238U, from 0.45 to 25.34 Bq/kg for 232Th and from 24.06 to 380.23 Bq/kg for 40K. The measured activity concentrations were used to assess of the radium equivalent activity ranged from 22.2 to 995.8 Bq/kg, the absorbed dose rate in air from 7 to 1209 nGy/h and the internal (0.1 to 2.8) and external (0.1 to 2.7) hazard indices. The data obtained in this study may be useful for natural radioactivity mapping.
Charge Order in a Two-Dimensional Kondo Lattice Model
Takahiro Misawa,Junki Yoshitake,Yukitoshi Motome
Physics , 2013, DOI: 10.1103/PhysRevLett.110.246401
Abstract: The possibility of charge order is theoretically examined for the Kondo lattice model in two dimensions, which does not include bare repulsive interactions. Using two complementary numerical methods, we find that charge order appears at quarter filling in an intermediate Kondo coupling region. The charge ordered ground state is an insulator exhibiting an antiferromagnetic order at charge-poor sites, while the paramagnetic charge-ordered state at finite temperatures is metallic with pseudogap behavior. We confirm that the stability of charge order is closely related with the local Kondo-singlet formation at charge-rich sites. Our results settle the controversy on charge order in the Kondo lattice model in realistic spatial dimensions.
Characterization of Defects and Stress in Polycrystalline Silicon Thin Films on Glass Substrates by Raman Microscopy
Kuninori Kitahara,Toshitomo Ishii,Junki Suzuki,Takuro Bessyo,Naoki Watanabe
International Journal of Spectroscopy , 2011, DOI: 10.1155/2011/632139
Abstract: Raman microscopy was applied to characterize polycrystalline silicon (poly-Si) on glass substrates for application as thin-film transistors (TFTs) integrated on electronic display panels. This study examines the crystallographic defects and stress in poly-Si films grown by industrial techniques: solid phase crystallization and excimer laser crystallization (ELC). To distinguish the effects of defects and stress on the optical-phonon mode of the Si–Si bond, a semiempirical analysis was performed. The analysis was compared with defect images obtained through electron microscopy and atomic force microscopy. It was found that the Raman intensity for the ELC film is remarkably enhanced by the hillocks and ridges located around grain boundaries, which indicates that Raman spectra mainly reflect the situation around grain boundaries. A combination of the hydrogenation of films and the observation of the Si-hydrogen local-vibration mode is useful to support the analysis on the defects. Raman microscopy is also effective for detecting the plasma-induced damage suffered during device processing and characterizing the performance of Si layer in TFTs. 1. Introduction Raman microscopy has been used in the field of semiconductor technologies to characterize lattice defect, damage, and stress introduced during crystallization and device processing. Amorphous silicon (a–Si) films and polycrystalline silicon (poly-Si) films on glass substrates have been extensively researched for application as thin-film transistors (TFTs) integrated on liquid crystal display (LCD) panels. The use of poly-Si instead of conventional a–Si allows for high-definition LCD and the integration of driver circuits into the panels [1]. The primary advantage of poly-Si is the electron and hole mobility at least two orders of magnitude larger than those of a–Si. Poly-Si TFTs are also applied in organic light-emitting diode panels. In the future, the applications of the thin-film poly-Si technology will extend to flexible displays, microprocessor-display-combined devices, and solar cells. Poly-Si films on glass substrates are generally fabricated by the recrystallization of an a–Si precursor. The recrystallization is industrially performed by solid-phase crystallization (SPC) or excimer laser crystallization (ELC) [2, 3]. Using these techniques, the film quality is degraded by large density defects due to the seed less growth and restriction of growth temperature. Moreover, stress is caused by the differences of the film and substrate materials. Thus, characterization of the defects and stress is
Apocrine Sweat Gland Ductal Adenoma with Sebaceous Differentiation in a Dog
Masaki Michishita,Junki Yasui,Rei Nakahira,Hisashi Yoshimura,Kimimasa Takahashi
Case Reports in Veterinary Medicine , 2013, DOI: 10.1155/2013/167923
Abstract: A 7-year-old male, Border Collie, developed a firm mass, measuring approximately 1?cm in diameter, in the left buccal skin. Histologically, the mass was composed of ductal structures lined by bilayered luminal epithelial and basaloid tumor cells along with a few nests of sebaceous cells. Immunohistochemical staining revealed that the luminal epithelial tumor cells were positive for cytokeratin (CK, CAM5.2) and CK19 but not for CK14 or p63. In contrast, the basaloid tumor cells were positive for CK14, p63, and αSMA but not for CK19 or CAM5.2. CK8 expression was observed in both luminal epithelial and basaloid tumor cells. The tumor cells with sebaceous differentiation were positive for CK14 but not for the other markers. This is the first case of an apocrine sweat gland ductal adenoma with sebaceous differentiation occurring in the buccal skin of a dog. 1. Introduction Apocrine sweat gland tumors are rather common in dogs and tend to occur on the head, neck, and limb. Approximately 70% of canine apocrine sweat gland tumors are benign in nature [1]. Benign tumors of the apocrine sweat gland are classified as apocrine adenomas, complex and mixed apocrine adenomas, or apocrine ductal adenomas [2]. Apocrine ductal adenomas in dogs are uncommon benign neoplasms and accounted for only 0.3% of canine skin tumors in a large survey [1]. In dogs, sebaceous differentiation has been described in five cases of mammary gland tumors [3–6]. However, to the authors’ knowledge, a nonmammary-associated apocrine tumor with sebaceous differentiation in dog has not been previously reported. 2. Case Report A 7-year-old male, Border Collie, developed a firm mass in the left buccal skin, which was surgically removed and submitted to the Department of Veterinary Pathology, Nippon Veterinary and Life Science University (Tokyo, Japan), for histopathological examination. Grossly, the mass was approximately 1 cm in diameter, and a cut surface of the mass appeared homogeneously greyish-white in color. A physical examination including complete blood count and a routine serum biochemical profile revealed no further abnormalities. Detailed radiographic and X-ray examinations did not reveal any mass suggestive of a tumor in the thoracic and abdominal cavities. No tumor recurrence or metastasis was noted after 9 months of surgical excision. Additional therapy was not performed. The excised mass was fixed in 10% neutral buffered formalin, embedded in paraffin wax, cut into 4?μm sections, and stained with hematoxylin and eosin (HE), periodic acid-Schiff (PAS), alcian blue, and oil red O
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