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Hierarchical Evaluation of Flexibility in Production Systems
Tsuboner, Hitoshi,Ichimura, Tomotaka,Horikawa, Mitsuyoshi,Sugawara, Mitsumasa Korean Institute of Industrial Engineers 2004 Industrial Engineeering & Management Systems Vol.3 No.1
This report examines the issue of designing an efficient production system by increasing several types of flexibility. Increasing manufacturing flexibility is a key strategy for efficiently improving market responsiveness in the face of uncertain market demand for final products. The manufacturing system comprises multiple plants, of which individual plants have multiple manufacturing lines that are designed to produce limited types of products in accordance with their size and materials. Imbalance in the workload occurs among plants as well as among manufacturing lines because of fluctuations in market demand for final products. Thereby, idleness of some manufacturing lines and longer lead times in some manufacturing lines occur as a result of the high workload. We clarify how these types of flexibility affect manufacturing performance by improving only one type of flexibility or by improving multiple types of flexibility simultaneously. The average lead time and the imbalance in workload are adopted as measures of manufacturing performance. Three types of manufacturing flexibility are interrelated: machine flexibility, routing flexibility, and process flexibility. Machine flexibility refers to the various types of operations that a machine can perform without requiring the prohibitive effort of switching from one order to another. Routing flexibility is the capability of processing a given set of part types using more than one line (alternative line) in the plant. Process flexibility results from being able to build different types of final products at the same plant.
Nonmagnetic Impurity Effect of the S = 1/2 Spin Ladder System (pipdH)2Cu1−xZnxBr4
Chiori Yokoyama,Eiichi Matsuoka,Hitoshi Sugawara,Takahiro Sakurai,Weimin Zhang,Susumu Okubo,Hitoshi Ohta,Hikomitsu Kikuchi 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the synthesis and the magnetic susceptibility of (pipdH)2Cu1−xZnxBr4(pipd=piperidinium), which is a nonmagnetic impurity-doped S = 1/2 spin ladder system. The sampleswere synthesized from a solution by using a slow evaporation method. Samples were confirmedto be in a single phase and to have the same crystal structure as the pure system (pipdH)2CuBr4by using X-ray diffraction measurements. To check the magnetic properties, we performed magneticsusceptibility and magnetization measurements with a superconducting quantum interferencedevice magnetometer. A plot of the inverse magnetic susceptibility indicates the presence of dominantantiferromagnetic coupling. The magnetic susceptibility shows a broad maximum due to lowdimensionality and a spin gap behavior related to the two-leg spin ladder at low temperature. Thespin gap and the Curie constants of Zn-doped samples, as estimated from an analysis of themagnetic susceptibility, monotonically decrease as the Zn concentration decreases. A nonmagneticimpurity of S = 1/2 spin ladder system affects the spin gap.
Magnetic Anisotropy of Tetragonal Rare-earth Compounds RRu2Al2B (R: Rare-earth Metals)
Eiichi Matsuoka,Yo Tomiyama,Kotaro Iwasawa,Hitoshi Sugawara,Takahiro Sakurai,Hitoshi Ohta 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
Recently, a new tetragonal compound CeRu2Al2B, which shows successive magnetic transitionsof antiferromagnetic and ferromagnetic orders was discovered. In this paper, the results of magnetizationmeasurements on magnetically-aligned powder sample of CeRu2Al2B were reported. Highly-anisotropic behaviors between the magnetizations along the easy and the hard directionswere observed. The anisotropic behavior of the magnetizations could be explained qualitativelyby considering the crystalline-electric-field scheme with the
Cu-NMR Studies of the Heavy-Fermion Compound CeCu6 under High Magnetic Fields
Keisuke Kuroda,Kyohei Morita,Hisashi Kotegawa,Hitoshi Sugawara,Hideki Tou 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report a Cu NMR Knight shift K in a prototypical heavy-fermion system CeCu6 in thetemperature range of 1.5 K - 100 K at applied magnetic fields up to 15 T. With increasing magneticfield, the 63Cu NMR Knight shift for Hk[001] is suppressed drastically. The suppression of K withincreasing field is consistent with the field dependence of the susceptibility. In order to explainthis behavior, we adopted the Kondo resonance level model, where the thermodynamics at lowtemperatures are proportional to the density of states at the energy µH. The resonant model wasfound to correctly predict the suppression of the Knight shift with increasing magnetic field.
Sb NQR Study of the Filled Skutterudite CeFe4Sb12 Synthesized under High Pressure
Ko-ichi Magishi,,Masahiro Takahashi,Takahito Saito,Kuniyuki Koyama,Hitoshi Sugawara,Takashi Saito,Sho Tatsuoka,Kenya Tanaka,Hideyuki Sato 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We report the results of Sb nuclear quadrupole resonance (NQR) measurements on the filledskutterudite CeFe4Sb12 synthesized under high pressure (HP) and compare them with those forthe sample synthesized under ambient pressure (AP) to understand the influence of the Ce-sitefilling fraction. The NQR spectra for the HP sample are much sharper than those for the APsample, suggesting that the Ce filling fraction is higher. Also, the nuclear spin-lattice relaxationrate 1/T1 follows an exponential decrease 1/T1 ∝ exp(−Δ/kBT), with the gap being Δ/kB = 270K at temperatures above 100 K, which is larger than that for the AP sample. This result suggeststhat the c-f hybridization is enhanced by increasing the Ce-site filling fraction.