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On the efficiency of secure XML broadcasting
Ko, H.K.,Kim, M.J.,Lee, S. Elsevier science 2007 Information sciences Vol.177 No.24
Secure broadcasting of web documents is becoming a crucial requirement for many web-based applications. Under the broadcast document dissemination strategy, a web document source periodically broadcasts (portions of) its documents to a potentially large community of users, without the need for explicit requests. By secure broadcasting, we mean that the delivery of information to users must obey the access control policies of the document source. Traditional access control mechanisms that have been adapted for XML documents, however, do not address the performance issues inherent in access control. In this paper, a labeling scheme is proposed to support rapid reconstruction of XML documents in the context of a well-known method, called XML pool encryption. The proposed labeling scheme supports the speedy inference of structure information in all portions of the document. The binary representation of the proposed labeling scheme is also investigated. In the experimental results, the proposed labeling scheme is efficient in searching for the location of decrypted information.
Annealing Temperature Dependence on the Physicochemical Properties of Copper Oxide Thin Films
J. Y. Park,T. H. Kwon,S. W. Kohk,강용철 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.4
We report the results of the characterization of Cu oxide thin films deposited by radio frequency (r.f.)magnetron sputtering at different annealing temperatures. The deposited Cu oxide thin films were investigated by scanning electron microscopy, spectroscopic ellipsometry, X-ray diffraction, atomic force microscopy, Xray photoelectron spectroscopy, and contact angle measurements. The thickness of the films was about 180 nm and the monoclinic CuO phase was detected. The CuO_2 and Cu(OH)_2 phases were grown as amorphous phase and the ratio of the three phases were independent on the annealing temperature. The surface of Cu oxide films changed from hydrophilic to hydrophobic as the annealing temperature increased. This phenomenon is due to the increase of the surface roughness. The direct optical band gap was also obtained and laid in the range between 2.36 and 3.06 eV.
Ryu,Weon Don,Lee,Seung Ro,Lee,Seung Chul,Hahm,Chang Kohk 한양대학교 의과대학 1991 한양의대 학술지 Vol.11 No.1
신경아세포종은 유아기 및 소아 초기의 빈번한 악성종양으로서 내원 당시 전이가 진행된 경우가 대부분이다. 또한 여러 방사선학적 검사로써 전이상태를 파악할 수 있기는 하나 간혹 중추신경계전이를 간과함으로써 향후 방산선치료나 예후에 영향을 줄 수 있다. 저자들은 3예의 전이성 신경아세포종을 경험하였기에 함께 보고하며 중추신경계전이의 확인유무의 중요성을 강조하는 바이다.