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Hikaru Kawasaki,Takahiro Matsui,Masaya Ohta,Katsumi Yamashita 대한전자공학회 2017 IEIE Transactions on Smart Processing & Computing Vol.6 No.2
N-continuous orthogonal frequency division multiplexing (OFDM) is a precoding method for sidelobe suppression of OFDM signals and seamlessly connects OFDM symbols up to the highorder derivative for sidelobe suppression, which is suitable for suppressing out-of-band radiation. However, it severely degrades the error rate as it increases the continuous derivative order. Two schemes for orthogonal precoding of N-continuous OFDM have been proposed to achieve an ideal error rate while maintaining sidelobe suppression performance; however, the large size of the precoder matrices in both schemes causes very high computational complexity for precoding and decoding. This paper proposes matrix decomposition of precoder matrices with a large size in the orthogonal precoding schemes in order to reduce computational complexity. Numerical experiments show that the proposed method can drastically reduce computational complexity without any performance degradation.
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.
Inter-professional and inter-departmental alcoholism rehabilitation program
Masahiro Kikuchi,Naomi Matsutani,Ryota Ishihara,Masako Sugihara,Yuuki Mizuno,Chiyo Chiba,Takahiro Ohta,Eri Yamada,Sota Oguro,Yasuko Sato,Hiroki Bessho,Yoshinori Horie 대한간학회 2020 Clinical and Molecular Hepatology(대한간학회지) Vol.26 No.4
A 3-month alcoholism rehabilitation program at psychiatric hospitals is common in Japan for patients with alcohol use disorder (AUD). However, many AUD patients are often hospitalized for the treatment of digestive disorders due to alcohol-related liver diseases and pancreatitis. In this sense, AUD patients need to be better supported by professionals and departments in general hospitals. Here we analyzed the problems in alcohol-related medical care in Japan and examined the measures to be taken at general hospitals.
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