Mobile forensic reference set (MFReS) and mobile forensic investigation for android devices

This paper proposes the mobile forensic reference set (MFReS), a mobile forensic investigation procedure and a tool for mobile forensics that we developed. The MFReS consists of repositories, databases, and services that can easily retrieve data from a database, which can be used to effectively classify meaningful data related to crime, among numerous data types in mobile devices. Mobile data consist of system data, application data, and multimedia data according to characteristics and format. We have developed a mobile forensic process that can effectively analyze information from installed applications and user behavior through these data. In particular, our tool can be useful for investigators because it can analyze the log files of all applications (apps) and analyze behavior based on timeline, geodata, and other characteristics. Our research can contribute to the study of mobile forensic support systems and suggest the direction of mobile data analysis tool development.     

Design and Implementation of MIMO-OFDM Baseband Processor for High-Speed Wireless LANs

In this brief, we present the design and implementation results of a digital 120 Mb/s multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) wireless LAN (WLAN) baseband processor based on the proposed decoding algorithms. The processor has two MIMO-OFDM modes, space-frequency block coded OFDM and space division multiplexed OFDM. From those, it achieves a considerable performance gain as well as supports double data rates compared to the conventional IEEE 802.11a WLANs. In the results of performance evaluation, the processor requires a signal-to-noise ratio of 1.8-27 dB for transmission modes at 10% packet error rate, and the chip is implemented with 4.8 M transistors in 3.9 times 3.9 mm2 using 0.18-mum CMOS process.     

Electrochemical oxidation of some basic alcohols on multiwalled carbon nanotube–platinum composites

Some composites of multiwalled carbon nanotubes, which were chemically treated in acidic and/or hydrogen peroxide solution, and platinum nanoparticles were prepared by the simple reduction in glycerol solution. Carboxylated and/or hydroxyl MWNTs were structurally analysed using X-ray photoelectron spectroscopy. In addition, the MWNT?CPt composites were characterized by XRD and TEM in detail. The electrochemical oxidation of some basic alcohols, which was catalyzed by the MWNT?CPt composites, was analysed by cyclic voltammetry. Their catalytic activities were studied with cyclic voltammograms of alcohols.     

Enhancement of two-factor authenticated key exchange protocols in public wireless LANs

In 2008, Juang and Wu proposed two authenticated key exchange protocols by improving Park and Park’s two-factor authenticated key exchange protocol in public wireless LANs. They pointed out that Park’s protocol was vulnerable to the dictionary attack on the identity protection. The improved protocols requires fewer exchanged messages and provided more secure protection for the client’s identity. In this paper, we propose two protocols require less exchanged messages than Juang’s protocols. In addition to this advantage, we point out that the identity protection of Juang’s protocol is computationally inefficient for the server and efficient identity protection is proposed in the second proposed protocol.     

用小规模试验数据预测全尺寸火灾试验结果

在消防界，很多人都想用小规模试验数据来预测全尺寸火灾试验的最终结果。为了通过模拟平行板试验的中等规模试验来达到这个目的，并且把试验结果与FM认可的25ft墙脚火试验（ANSIFM4880）的结果进行比较。利用从实验室试验得来的数据开发了一个模型，用来预测燃烧平行板材所获得的全部热释放速率。对于不同的板材，平行板材下面的沙盘燃烧器释放的速率也随之不同。比较结果非常不错。但是，同25ft墙脚试验的比较显示，通过修正空间和燃烧器大小可以获得与平行板材构造更佳的相关性。     

Silver-palladium alloy deposited by DC magnetron sputtering method as lubricant for high temperature application

The silver-palladium(Ag-Pd) alloy coating as a solid lubricant was investigated for its application to the high temperature stud bolts used in nuclear power plants. A hex bolt sample was prepared in the following steps: 1) bolt surface treatment using alumina grit blasting for cleaning and increasing the surface area; 2) nickel(Ni) film coating as a glue layer on the surface of the bolt; and 3) Ag-Pd alloy coating on the Ni film. The films were deposited by using a direct current(DC) magnetron sputtering system. The thickness and composition of the Ag-Pd alloy film have effect on the friction coefficient, which was determined using axial force measurement. A 500 nm-thick Ag-Pd (80:20, molar ratio) alloy film has the lowest friction coefficient of 0.109. A cyclic test was conducted to evaluate the durability of bolts coated with either the Ag-Pd (80:20) alloy film or N-5000 oil. In a cycle, the bolts were inserted into a block using a torque wrench, which was followed by heating and disassembling. After only one cycle, it was not possible to remove the bolts coated with the N-5000 oil from the block. However, the bolts coated with the Ag-Pd (80:20) alloy could be easily removed up until 15 cycles.     

A Practical and Secure Electronic Election System

E‐voting is expected to offer prominent advantages over traditional voting methods. Advantages include faster tallying, greater accuracy, prevention of void ballots, and lower cost. However, many experts express concerns about the potential for large‐scale fraud. Recently, many paper based end‐to‐end (E2E) voter verifiable systems providing individual verifiability and universal verifiability have been proposed. These systems, unlike previous voting systems, are used in polling booths and without access to trusted computing devices at the time of voting. In this paper, we propose a practical and secure E2E voter verifiable system using a paper receipt based on cryptographic technologies.     

Tuning a Protein‐Labeling Reaction to Achieve Highly Site Selective Lysine Conjugation

Activated esters are widely used to label proteins at lysine side chains and N termini. These reagents are useful for labeling virtually any protein, but robust reactivity toward primary amines generally precludes site‐selective modification. In a unique case, fluorophenyl esters are shown to preferentially label human kappa antibodies at a single lysine (Lys188) within the light‐chain constant domain. Neighboring residues His189 and Asp151 contribute to the accelerated rate of labeling at Lys188 relative to the ≈40 other lysine sites. Enriched Lys188 labeling can be enhanced from 50–70 % to >95 % by any of these approaches: lowering reaction temperature, applying flow chemistry, or mutagenesis of specific residues in the surrounding protein environment. Our results demonstrated that activated esters with fluoro‐substituted aromatic leaving groups, including a fluoronaphthyl ester, can be generally useful reagents for site‐selective lysine labeling of antibodies and other immunoglobulin‐type proteins.     

Arsenic(III) oxidation by iron(VI) (ferrate) and subsequent removal of arsenic(V) by iron(III) coagulation

We investigated the stoichiometry, kinetics, and mechanism of arsenite [As(III)] oxidation by ferrate [Fe(VI)] and performed arsenic removal tests using Fe(VI) as both an oxidant and a coagulant. As(III) was oxidized to As(V) (arsenate) by Fe(VI), with a stoichiometry of 3:2 [As(III):Fe(VI)]. Kinetic studies showed that the reaction of As(III) with Fe(VI) was first-order with respect to both reactants, and its observed second-order rate constant at 25 degrees C decreased nonlinearly from (3.54 +/- 0.24) x 10(5) to (1.23 +/- 0.01) x 10(3) M(-1) s(-1) with an increase of pH from 8.4 to 12.9. A reaction mechanism by oxygen transfer has been proposed for the oxidation of As(III) by Fe(VI). Arsenic removal tests with river water showed that, with minimum 2.0 mg L(-1) Fe(VI), the arsenic concentration can be lowered from an initial 517 to below 50 microg L(-1), which is the regulation level for As in Bangladesh. From this result, Fe(VI) was demonstrated to be very effective in the removal of arsenic species from water at a relatively low dose level (2.0 mg L(-1)). In addition, the combined use of a small amount of Fe(VI) (below 0.5 mg L(-1)) and Fe(III) as a major coagulant was found to be a practical and effective method for arsenic removal.     

SOLAR CELLS WITH 15.6% EFFICIENCY ON MULTICRYSTALLINE SILICON,USING IMPURITY GETTERING,BACK SURFACE FIELD AND EMITTER PASSIVATION

Three features have been combined to raise the efficiency of solar cells made on industrial multicrystalline silicon wafers: 1) reduction of bulk recombination by a special gettering process, 2) reduction of back recombination by using a p/p ⁺ junction, 3) reduction of front recombination by emitter back-etching and passivation.

A conversion efficiency of 15.6% has been achieved on 2 × 2 cm² solar cells. Spectral response measurements are used to identify the role of each processing parameter.