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EMURA, Keita,SEO, Jae Hong,YOUN, Taek-Young 'Institute of Electronics, Information and Communi 2016 IEICE transactions on fundamentals of electronics, Vol.ea99 No.1
<P>Boneh and Franklin considered to add the revocation functionality to identity-based encryption (IBE). Though this methodology is applicable to any IBE and hierarchical IBE (HIBE), the resulting scheme is non-scalable. Therefore, a generic transformation of scalable revocable (H) IBE (R(H) IBE) from non-scalable R(H) IBE is really desirable. Towards this final goal, in this paper we introduce prototype RHIBE which does not require to be scalable (but requires some conditions), and propose a generic transformation of scalable RHIBE from prototype RHIBE. Moreover, we construct a prototype RHIBE scheme based on the decisional bilinear Diffie-Hellman (DBDH) assumption. Since our prototype RHIBE provides history-free update, insider security, and decryption key exposure resistance, our construction yields the first RHIBE scheme based on the static assumption with these desirable properties.</P>
Shuichi Emura,Masanobu Nunogaki,Yoshiyuki Nakata 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
Surfaces of metallic Ti have been modified successfully to thick layers of metalceramic, TiC, by reactive plasma processing. The carbonized surfaces consist of mixed layers of TiC and metallic Ti. TiC grains grow up on the Ti substrate with island forms. The metal Ti acts as a “paste” between the growing TiC grains. The hardness of the modified surface layers increases with processing temperature. The hardness reaches 5000 kg/mm2 at a processing temperature of about 1300 oC, which is a value comparable to bulk TiC. Analysis of the XAFS spectrum and the diffraction profiles for the fabricated layers shows a reduction of the Ti-Ti distance from a distance of 3.07 Å for the bulk TiC to 3.025 Å. Using the results of the local structures around a Ti element by XAFS analysis, we will try to elucidate the abnormal hardness of the newly fabricated TiC by an analytical model. Surfaces of metallic Ti have been modified successfully to thick layers of metalceramic, TiC, by reactive plasma processing. The carbonized surfaces consist of mixed layers of TiC and metallic Ti. TiC grains grow up on the Ti substrate with island forms. The metal Ti acts as a “paste” between the growing TiC grains. The hardness of the modified surface layers increases with processing temperature. The hardness reaches 5000 kg/mm2 at a processing temperature of about 1300 oC, which is a value comparable to bulk TiC. Analysis of the XAFS spectrum and the diffraction profiles for the fabricated layers shows a reduction of the Ti-Ti distance from a distance of 3.07 Å for the bulk TiC to 3.025 Å. Using the results of the local structures around a Ti element by XAFS analysis, we will try to elucidate the abnormal hardness of the newly fabricated TiC by an analytical model.
Blended Elemental P/M Synthesis of Titanium Alloys and Titanium Alloy-based Particulate Composites
Hagiwara Masuo,Emura Satoshi 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Titanium alloys and Titanium alloy-based particulate composites were synthesized using the blended elemental P/M route. First, processing conditions such as the fabrication of master alloy powder were investigated. Ti-6Al-4V, Ti-5Al-2.5Fe, Ti-6Al-2Sn-4Zr-2Mo, IMI685, IMI829, Timetal 1100 and Timetal 62S, and Ti-6Al-2Sn-4Zr-2Mo/ 10%TiB and Timetal 62S/10%TiB were then synthesized using the optimal processing conditions obtained. The microstructures and mechanical properties such as tensile strength and high cycle fatigue strength were evaluated.
Enhanced Mechanical Properties of Orthorhombic Ti₂AlNb-Based Intermetallic Alloy
Hagiwara, M.,Emura, S.,Araoka, A.,Kong, B.O.,Tang, F. 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.3
Attempts were made to improve the mechanical properties of an orthorhombic Ti₂AlNb-based Ti-22Al-27Nb intermetallic alloy through microstructural and compositional modifications, and the dispersion of fine TiB particulates. A Ti-22Al-27Nb alloy with a prior B2 grain size ranging from 8 mm to 49 ㎛ was successfully obtained using spherical α₂particles as obstacles to grain growth. The finest grained material showed an excellent combination of room temperature tensile strength (around 1,000 MPa) and tensile ductility (more than 15 %). Transition metal elements such as Mo, V and W for a portion of the Nb in the Ti-22Al-27Nb were substituted. The guideline for this compositional modification required that the beta phase stability in the modified alloy be equal to that of the Ti-22Al-27Nb. It was found that the substitution of 2 % W for 7 % Nb was quite effective in increasing tensile strength at temperatures above 923 K and reducing the steady state creep rate and primary creep strain. The Ti-22Al-27Nb alloy-based particulate composites reinforced with 6.5 % TiB were successfully produced with the gas atomization P/M method. The dispersion of extremely small TiB was very uniform. Most of the mechanical properties of the composites, including the yield stress, tensile strength, Young's modulus, resistance to creep, and high cycle fatigue strength were greatly superior to those of the matrix alloy.
Structural Design and Construction of the Foundation of TOKYO SKYTREE
Konishi, Atsuo,Emura, Masaru Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.4
This paper introduces the structural design and construction method for the foundation of the TOKYO SKYTREE, a new digital broadcasting tower in Tokyo, which has a height of 634 meters. The surface layer of the ground is occupied by soft soil, thus the foundation of this tower is an SRC continuous underground wall pile, designed and developed to have horizontal rigidity and pull-out resistance. The structural integrity and construction method of the wall pile was verified with an on-site full scale pull-out test concluding a maximum load of 40,000 kN.