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1
Implimentation of a Collimated DT Neutron Beam at the 1st Target Room of JAEA/FNS for New Integral Benchmark Experiments

S. Ohnishi,K. Kondo,S. Sato,K. Ochiai,K. Takakura,C. Konno,I. Murata 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
A new collimator system was constructed to produce a new collimated DT neutron beam for new integral benchmark experiments at the first target room of the Fusion Neutronics Source facility in Japan Atomic Energy Agency. The collimator system had been designed and optimized with a neutron transport calculation code and the performance of the collimated DT neutron beam was tested with an imaging plate, activation foil and a scintillation counter. The DT neutron flux at the exit of the collimator hole was 2.22 × 10^6 cm^(-2)s^(-1), which was 239 times as large as that at the 2 cm off-centered position. It was confirmed that the new DT neutron beam had a good performance as expected.
2
Effects of Plastic Strain and Strain Path on Young's Modulus of Sheet Metals

Yamaguchi, K .,Adachi, H .,Takakura, N . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
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- 복사/대출신청
The effects of plastic strain and strain path on Young's modules of sheet metals are experimentally investigated using low carbon steel, stainless steel, aluminium, copper and brass sheets of 1 mm thickness. These sheets are firstly deformed to different plastic strains under a few strain paths from balanced biaxial stretching to uniaxial tension. Then, a small uniaxial tension test specimen is cut from each deformed sheet and Young's modules is measured using electrical-resistance strain gauges glued to both surfaces of the specimen. The experimental results show that Young's moduli of the low carbon steel and stainless steel sheets decrease with increasing plastic strain, while those of aluminium, copper and brass sheets hardly change with the plastic strain. In all materials, however, the effect of the strain path on Young's modules is not necessarily evident. It is confirmed that Young's modules of the low carbon steel sheet can be recovered to the initial value of undeformed sheet by a subsequent annealing. In addition to Young s modules, the effects of the plastic strain and the strain paths on Poisson's ratio of these materials are also shown.
3
Toward a more practical unsupervised anomaly detection system

Song, J.,Takakura, H.,Okabe, Y.,Nakao, K. North-Holland [etc ; Elsevier Science Ltd 2013 Information sciences Vol.231 No.-
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During the last decade, various machine learning and data mining techniques have been applied to Intrusion Detection Systems (IDSs) which have played an important role in defending critical computer systems and networks from cyber attacks. Unsupervised anomaly detection techniques have received a particularly great amount of attention because they enable construction of intrusion detection models without using labeled training data (i.e., with instances preclassified as being or not being an attack) in an automated manner and offer intrinsic ability to detect unknown attacks; i.e., 0-day attacks. Despite the advantages, it is still not easy to deploy them into a real network environment because they require several parameters during their building process, and thus IDS operators and managers suffer from tuning and optimizing the required parameters based on changes of their network characteristics. In this paper, we propose a new anomaly detection method by which we can automatically tune and optimize the values of parameters without predefining them. We evaluated the proposed method over real traffic data obtained from Kyoto University honeypots. The experimental results show that the performance of the proposed method is superior to that of the previous one.