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The electrochemical treatments, especially, electrochemically advanced oxidations using dimensional stable anodes (DSAs) are broadly applicable. Low operation voltages and good longevity could be determined by the interactive relationship between the catalytic noble metal oxides on a thermally grown titanium oxide and their interlayers which stabilizes bonding between the noble metal oxide particles and the substrate. In this study, Ir-Ru-Ta based Ti electrodes were prepared as DSA by calcination at different temperatures. The effect of the temperatures on durability and performance was investigated in terms of XPS, various voltammetry methods, electrochemical impedance spectroscopy, and accelerated life tests. <sup>**</sup>This work is supported by the Human Resource Training Program for Regional Innovation and Creativity through the Ministry of Education and National Research Foundation of Korea(NRF-2015H1C1A1034436).
Information technology has been made remarkable progress and most of computer systems are connected with internet over the world. We have not only advantages to access them easy, but also disadvantages to misuse information, abuse, crack, and damage privacy. We should have safeguards to preserve confidentiality, integrity and availability for our information system. Even tough the security is very important for the defense information system, we should not over limit users availability. BS7799, a British standard, is an evaluation criteria for information security management. In this paper we propose an audit model to manage and audit information security using control items of BS7799, which could be useful to mange the defence information system security. We standardize audit items, and classify them by levels, and degrees by using appropriate audit techniques / methods / processes.
웨어러블 IT 시대를 맞이하여, 여러 기기의 전원으로 역할을 하는 이차전지도 새로운 기능이 요구되고 있다. 기존의 리튬이차전지는 각형이나 원통형으로 형상이 국한 되어 있어, 의복이나 신체에 부착하기 적합하지 않았으며, 학계와 산업계에서는 이를 극복하기 위한 다양한 연구들이 현재 진행되고 있다. 카이스트에서는 옷이나 시계, 피부 등에 자연스럽게 접합할 수 있는 이차전지를 개발하고 있으며, 섬유를 기반으로 한 이차전지 연구가 대표적이다. 본 발표에서는 웨어러블 이차전지의 최근 연구 동향을 개괄적으로 살펴 보고, 섬유를 기반으로 하는 이차전지 연구와 피부 접합이 용이한 박막형 이차전지 내용을 소개하고자 한다.
Although Li-ion batteries have been successful in various applications, their shortcomings with regard to high cost and global maldistribution of raw materials, as well as safety concerns have stimulated alternative rechargeable batteries based on other carrier ions represented by sodium and magnesium ions, targeting grid-scale energy storage systems (ESSs). In this talk, I will introduce a new approach of engaging intercalated water in layered cathode materials. The intercalated water improves the performance of the given materials substantially by shielding electrostatic interactions or maintaining the crystal frameworks over repeated cycles. Detailed effects of intercalated water will also be described, along with promising potentials towards aqueous operations.
Although Lithium-ion batteries (LIBs) have been greatly successful as power sources of in various applications, they are evolving for further improved performance . All-solid-state-batteries (ASSBs) are drawing discernable attention due to their superior safety. In particular, in response to this trend related to those emerging batteries, new binder designs are demanded. In the first part of this talk, I will present advanced binder designs for LIB electrodes that undergo huge volume change. Such binder designs emphasize a principle relying on supramolecular chemistries. In the second part of this talk, I will introduce some binder designs targeting sulfide-based ASSBs. I will first introduce the difficulty of finding solvent-binder pairs compatible with sulfide electrolytes and will then cover our recent process on how to avoid the given problem. Along this direction, I will introduce binder designs based on click and deprotection chemistry.
Mixing improvement is an essential task in microfluidic applications since mixing is entirely governed by molecular diffusion transport at this scale and it thus proceeds downstream very slowly. In this work, we numerically investigate the effect of obstacle configuration on mixing efficiency. Before the analysis, the unstructured grid CFD method for concentration transport is validated by the simulation of flows in uniform microchannel. The solutions well correspond to exact solutions. Next, mixing in a Y-channel micromixer with obstacles is numerically investigated. From the simulations, the mixing efficiency appears to be proportional to the magnitude of the formation of lateral velocity component. It is also shown that the asymmetric layout and radius enlargement of obstacles greatly improves mixing efficiency and thereby optimum configuration of the micromixer may be obtained with the aid of design optimization.