http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Topology Discovery for Telecommunications-carrier Networks using Equipment Alarms
Atsushi Takada,Naoki Hayashi,Mizuto Nakamura,Naoyuki Tanji,Toshihiko Seki,Kyoko Yamagoe 한국통신학회 2020 한국통신학회 APNOMS Vol.2020 No.09
As for the service assurance operation of telecommunications carriers, accurate information about a network topology which indicates the connection relationships between pieces of network equipment is necessary. However, the network of a telecommunications carrier has several hundreds of thousands of equipment, and its topology is frequently supplemented and modified due to daily construction work and troubleshooting. It is a therefore a problem when incorrect topology information is mixed into the overall topology information. In this paper, we propose a method that can discover the topology between equipment by using alarm information issued by those equipment during construction work or when a failure occurs. The proposed method was evaluated using alarm information generated under in certain commercial configurations (sections containing specific routers), and it was confirmed that the current topology could be discovered with 100% accuracy, even though only 1.7% of the total topology was evaluated in one day.
I/Q Imbalance Compensation in the Presence of Time-Varying Channel
Atsushi Minoda,Masashi Nakamura,Hai Lin,Katsumi Yamashita 한국멀티미디어학회 2009 한국멀티미디어학회 국제학술대회 Vol.2009 No.-
I/Q signal processing commonly faces the I/Q imbalance problem, which severely degrade the performance particularly in direct-conversion architecture receiver. In this paper, we propose a method for compensating I/Q imbalances using training sequence in time-varying channel. Finally, we estimate the parameters for I/Q imbalance compensation by maximum likelihood estimation (MLE).
Fabrication and EL Emission of ZnO-Based Heterojunction Light-Emitting Devices
Sandip Gangil,Atsushi Nakamura,Kenji Yamamoto,Toshiya Ohashi,Jiro Temmyo 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.1
Nitrogen-doped p-type MgZnO films were successfully realized on a-plane sapphire substrates and were used in an n-MgyZn1-yO/n-Zn1-xCdxO/p-MgyZn1-yO:N/p-SiC heterojunction structure to act as barrier layer leading to sharpening of the electroluminescence (EL) in terms of reducing the full width at half maximum (FWHM). The X-ray photoelectron spectroscopy (XPS) analysis of the c-axis-oriented nitrogen-doped MgZnO film confirmed the presence of Mg2+ at 49.8 eV in Mg (2p region) in the ZnO:N lattice, replacing Zn2+. Zn-N formations were clearly visible in the Zn (2p3=2) region and the signal for nitrogen-replacing oxygen (NO) emerged at 396.9 eV. With respect to ZnO:N polar films (n-type in as-grown conditions), as-grown polar MgZnO:N films had the upper hand by holding a p-type nature due to Mg incorporation ascribed to the formation of Mg- related (interactions of Mg with N) tri-atomic acceptor-donor-acceptor-configured p-type supportive complexes. The nitride formations were noticeable in the X-ray diffraction (XRD) spectra. The formation of complexes and their effects are discussed in this paper. Nitrogen-doped p-type MgZnO films were successfully realized on a-plane sapphire substrates and were used in an n-MgyZn1-yO/n-Zn1-xCdxO/p-MgyZn1-yO:N/p-SiC heterojunction structure to act as barrier layer leading to sharpening of the electroluminescence (EL) in terms of reducing the full width at half maximum (FWHM). The X-ray photoelectron spectroscopy (XPS) analysis of the c-axis-oriented nitrogen-doped MgZnO film confirmed the presence of Mg2+ at 49.8 eV in Mg (2p region) in the ZnO:N lattice, replacing Zn2+. Zn-N formations were clearly visible in the Zn (2p3=2) region and the signal for nitrogen-replacing oxygen (NO) emerged at 396.9 eV. With respect to ZnO:N polar films (n-type in as-grown conditions), as-grown polar MgZnO:N films had the upper hand by holding a p-type nature due to Mg incorporation ascribed to the formation of Mg- related (interactions of Mg with N) tri-atomic acceptor-donor-acceptor-configured p-type supportive complexes. The nitride formations were noticeable in the X-ray diffraction (XRD) spectra. The formation of complexes and their effects are discussed in this paper.
Yamada, Hiroaki,Nakamura, Utano,Nakamura, Toshio,Uchida, Yoshikazu,Yamatsu, Atsushi,Kim, Mujo The Korean Nutrition Society 2019 Nutrition Research and Practice Vol.13 No.6
BACKGROUND/OBJECTIVES: Osteoarthritis (OA) is a major public health issue in Japan and other countries, and foods that prevent or treat OA are in strong demand. Proteins and peptides in chicken meat and bones are known for being rich in functional and nutritional ingredients for the improvement of osteoporosis. We speculated that chicken legs, a food consumed in many regions of the world, may also contain such ingredients. In this study, we aim to (i) evaluate the effect of chicken leg extract (CLE) on the promotion of cartilage matrix production and (ii) identify the active ingredient in CLE that contributes to this function. MATERIALS/METHODS: Artificial CLE digest was prepared, and the acid mucopolysaccharide production-promoting activity of the CLE digest was evaluated by alcian blue staining of ATDC5 cells. CLE was orally administered to rabbits with burr holes in the knee joint of the femur, and the degree of regeneration of cartilage matrix was evaluated. Furthermore, we investigated orally administered CLE-derived peptides in human plasma using LC-MS. From measuring the acid mucopolysaccharide production-promotion activity of these peptides, a molecule considered to be an active ingredient in the CLE digest was identified. RESULTS: CLE digest promoted acid mucopolysaccharide production and facilitated regeneration of cartilage matrix in in vitro and in vivo experiments. Four peptides including phenylalanyl-hydroxyproline (Phe-Hyp) were detected as CLE-derived peptides in human plasma. The effect of CLE was inferred to be due to Phe-Hyp, which was confirmed to be present in the CLE digest. CONCLUSIONS: It was shown that CLE stimulated the production of articular cartilage matrix both in vitro and in vivo, and that CLE could be an effective food for preventing or treating OA. Furthermore, only Phe-Hyp was confirmed as the active compound in the CLE digest, suggesting that the activity of CLE was due to Phe-Hyp.
Hiroaki Yamada,Utano Nakamura,Toshio Nakamura,Yoshikazu Uchida,Atsushi Yamatsu,Mujo Kim 한국영양학회 2019 Nutrition Research and Practice Vol.13 No.6
BACKGROUND/OBJECTIVES: Osteoarthritis (OA) is a major public health issue in Japan and other countries, and foods that prevent or treat OA are in strong demand. Proteins and peptides in chicken meat and bones are known for being rich in functional and nutritional ingredients for the improvement of osteoporosis. We speculated that chicken legs, a food consumed in many regions of the world, may also contain such ingredients. In this study, we aim to (i) evaluate the effect of chicken leg extract (CLE) on the promotion of cartilage matrix production and (ii) identify the active ingredient in CLE that contributes to this function. MATERIALS/METHODS: Artificial CLE digest was prepared, and the acid mucopolysaccharide production-promoting activity of the CLE digest was evaluated by alcian blue staining of ATDC5 cells. CLE was orally administered to rabbits with burr holes in the knee joint of the femur, and the degree of regeneration of cartilage matrix was evaluated. Furthermore, we investigated orally administered CLE-derived peptides in human plasma using LC-MS. From measuring the acid mucopolysaccharide production-promotion activity of these peptides, a molecule considered to be an active ingredient in the CLE digest was identified. RESULTS: CLE digest promoted acid mucopolysaccharide production and facilitated regeneration of cartilage matrix in in vitro and in vivo experiments. Four peptides including phenylalanyl-hydroxyproline (Phe-Hyp) were detected as CLE-derived peptides in human plasma. The effect of CLE was inferred to be due to Phe-Hyp, which was confirmed to be present in the CLE digest. CONCLUSIONS: It was shown that CLE stimulated the production of articular cartilage matrix both in vitro and in vivo, and that CLE could be an effective food for preventing or treating OA. Furthermore, only Phe-Hyp was confirmed as the active compound in the CLE digest, suggesting that the activity of CLE was due to Phe-Hyp.
Electroluminescence from n-Zn(Mg,Cd)O/ p-4H-SiC:Al Heterojunctions
Kenji Yamamoto,Toshiya Ohashi,Atsushi Nakamura,Temmyo Jiro 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.5
Electroluminescence (EL) from n-Mg0:18Zn0:82O/ n-Zn(Mg,Cd)O/ p-4H-SiC:Al heterojunction diodes fabricated by using remote-plasma-enhanced metal-organic chemical-vapor deposition was measured to investigate some recombination processes of hole injection by changing the bandgap of n-Zn(Mg,Cd)O. EL emissions from the heterojunction utilizing n-Zn1-xCdxO (x > 0.07) were observed to coincide with the photoluminescence (PL) emission energy of the corresponding alloy content due to hole injection from the p-4H-SiC:Al to the n-Zn1-xCdxO layer in the type-I het-erojunctions. However, broad EL emissions from the type-II heterojunctions utilizing n-ZnO and n-Mg0:12Zn0:88O were observed at around 2.8 eV. These broad ELs were caused by the recombination of carriers in p-4H-SiC:Al due to electron injection from n-Zn(Mg,Cd)O to p-4H-SiC:Al and by the recombination of spatially separated carriers at the heterointerface.