• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.24 no.3
• /
• pp.453-460
• /
• 2014

Fault injection attack is the process of attempting to acquire the information on-chip through inject artificially generated error code into the cryptographic algorithms operation (or perform) which is implemented in hardware or software. From the details above, the laser-assisted failure injection attacks have been proven particularly successful. In this paper, we propose an improved laser probing system for fault injection attack which is called the Dual-Laser FA tool set, a hybrid approach of the Flash-pumping laser and fiber laser. The main concept of the idea is to improve the laser probe through utilizing existing equipment. The proposed laser probe can be divided into two parts, which are Laser-I for laser cutting, and Laser-II for fault injection. We study the advantages of existing equipment, and consider the significant parameters such as energy, repetition rate, wavelength, etc. In this approach, it solves the high energy problem caused by flash-pumping laser in higher repetition frequency from the fiber laser.

• Journal of the Korea Computer Industry Society
• /
• v.2 no.7
• /
• pp.975-982
• /
• 2001

In this study, a solid-state laser system adopting a new real time multi-discharge (RTMD) method in which three flashlamps are turned on consecutively was designed and fabricated to examine the pulse width and the pulse shape of the laser beams depending upon the changes in the lamp rum-on time. That is, this study shows a technology that makes it possible to make various pulse shapes by turning on three flashlamps consecutively on a real-time basis with the aid of a PIC one-chip microprocessor. With this technique, the lamp turn-on delay time can be varied more diversely from 0 to 10 ms and the real-time control is possible with an external keyboard, enabling various pulse shapes. In addition, longer pulses can be more widely used for industrial processing and lots of medical purposes

• International Journal of Highway Engineering
• /
• v.7 no.4 s.26
• /
• pp.151-162
• /
• 2005

Variable Message Sign (VMS), which provides drivers with direct information about state of traffic congestion and for prevent an accident, is the most effective method among the methods of providing information in Advanced Transportation Management System. Currently establishment and the VMS which is operated foundation lets in Guidelines on the use of Variable message sign (a book of the VMS) of 1999 November the Ministry Construction & Transportation, these contents mean main viewpoint on physical part such as message special quality variable (font, character size and line space, word interval) and position mainly among standard about establishment in general. But, it is true that using without effect verification on the character of VMS display and that using mode of stationary-centered. In this paper, it executed significance test to effort verification on the character of VMS display for more practical and effective information transmission based on the driver viewpoint For the researches; develop 3D-Simulation, select characteristics of driver's visual cognition behavior (the conspicuity, the legibility and the comprehensibility), evaluation each issue (day or night, 80km/h or 100km/h). Especially, that used the Eye Marker Recorder to measure of reading-time (legibility) thus, confirmed objectivity and reduce an observational error. The results showed that the conspicuity is Flashing> Stationary>Scroll. The legibility is not deference that Flashing between stationary form. Also the comprehensibility result showed that Flashing> Stationary>Stroll form.

• Proceedings of the KIEE Conference
• /
• 2001.07c
• /
• pp.1691-1693
• /
• 2001

펄스형 Nd:YAG 레이저는 연속형에 비해 효율이 높고 높은 첨두 출력(peak power)이 가능하므로 가공에 있어서 여러 가지 장점이 있다. 더구나 레이저 펄스 모양을 가변시키는 기능은 펄스형 Nd:YAG 레이저로 가공하기 힘든 특수분야에까지 가공을 가능하게 하였다. 본 연구에서는 3개의 플래쉬램프를 순차 점등시키는 MD(multi-discharge)방식의 레이저 시스템을 설계 및 제작하여, 램프 점등 시간의 변화에 따른 레이저 빔의 펄스폭과 펄스 세기(펄스 크기)를 조사하였다. 즉, PIC One-Chip microprocessor를 이용하여 실시간으로 3개의 플래쉬램프를 순차적으로 점등시켜 보다 다양한 펄스 모양을 만드는 기술을 개발하였다. 위 방식의 장점은 램프의 점등 지연시간을 0 $\sim$ 10ms 까지 다양하게 변화시킬 수 있고, 외부의 키보드로 실시간 제어가 가능하므로 보다 편리하게 펄스 모양을 변화시킬 수 있다. 또한 긴 펄스를 만들 수 있어 산업용 가공이나 의료용으로 널리 사용될 수 있을 것이다.

• Journal of Advanced Marine Engineering and Technology
• /
• v.38 no.3
• /
• pp.312-317
• /
• 2014

In this paper, I propose the design technology of LLC resonant converter for the xenon flashlamp that is used to the solid state laser. Through the fabrication of 1.5kW large scale LLC resonant converter, the discharge characteristics are carried out, and introduce the new control method for limiting inrush current by the abrupt load current changes. The mathematical modeling for the lamp discharge includes the internal loss and lamp parameters. I propose the optimal method for the driving conditions of xenon flashlamp from the simulation results comparing the real measurements.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1993.10a
• /
• pp.218-223
• /
• 1993

An UBET(Upper Bound Elemental Technique) program has been developed to analyze forging load, die-cavity filling and effective strain distribution for flashless forging. To analyze the process easily, it is suggested that the deformation is divided into two different parts. Those are axisymmetric part in corner and plane-strain part in lateral. The total power consumption is minimized through combination of two deformation parts by building block method, from which the upper-bound forging load, the flow pattern, the grid pattern, the veocity distribution and the effective strain are determined. To show the merit of flashless forging, the result of flashless and flash forging processes are compared through theory and experiment. Experiments have been carried out with plasticine billets at room temperature. The theoretical predictions of the forging load and the flow pattern are in good agreement with the experimental results.

• Transactions of Materials Processing
• /
• v.19 no.3
• /
• pp.145-151
• /
• 2010

In case of thin-wall two-color injection molding, flashing often occurs when molten polymer flows into small gap at the parting line in mold with high pressure or under the unbalanced clamping force condition. In this study, flashing was examined in the production of thin-wall notebook case with large area when the rapid heat cycle molding (RHCM) technology was applied to the two-color injection molding. The effects of the RHCM technology on the part properties and weld-lines were compared with conventional injection molding. The flashing caused by the clamping device of the two-color injection molding machine was examined and compared by experiments and CAE analyses.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2001.11a
• /
• pp.746-751
• /
• 2001

본 논문에서는 디지털 논리회로에 대하여 인터넷을 기반으로 가상교육 및 실험실습이 가능한 멀티미디컨텐츠를 개발하였다. 가상강의를 위한 컨텐츠들은 WMT 기술 및 애니메이션이 포함된 파워포인트 자료로 구성된 화상강의 모들과 개념이해를 위한 플래쉬 및 회로실험을 위한 자바 프로그램들로 구성되었다. 또한 웹 상에서의 가상 실험실을 구현하기 위해 임의의 디지털 논리회로 설계 및 검증을 위한 LogicSim 프로그램과 실험기관과 IC 칩 등을 이용한 임의회로의 가상실험 프로그램인 BreadBoard 등을 개발하였고 웹 상에서의 리포트 작성, 제출 및 검사가 가능한 Report 프로그램, 이론 학습 및 가상실험 보조 유틸리티 프로그램들을 개발하였다.

• Proceedings of the KAIS Fall Conference
• /
• 2007.05a
• /
• pp.233-235
• /
• 2007

최근 환경보전의식의 변화에 따라 유아들의 환경보전에 대한 경각심이 고조되고 있음을 알 수 있다. 그러므로 본 논문에서는 유아들의 일상생활 속에서의 흙에 대한 내면화 과정을 단순 주입식 교육이 아닌 흙에 대한 지식을 이해하고 습득 및 필요성을 스스로 인식시킴으로써 아름다운 환경을 보전하려는 마음을 갖고 이를 실천할 수 있도록 하기 위해 2D 애니메이션 웹 컨텐츠를 설계하였다.

• 한국연소학회:학술대회논문집
• /
• 2005.10a
• /
• pp.99-103
• /
• 2005

This study focused on the use of orimulsion in industrial combustion systems. Orimulsion is a bitumen-in-water emulsified fuel, which contains a thirty percent water. Orimulsion has relatively high levels of sulfur and nitrogen compared to many fuel oils, and has been the subject of much debate regarding the environmental impacts of its use. The goal of this research is to analyse the effect of flash spray combustion characteristics of orimulsion on NOx and particulate material reduction. For the flash spray of orimulsion, it is heated by $150^{\circ}C$. The effects of fuel heating temperatures on NOx and particulate material emissions were investigated experimentally. As the fuel temperature was increased, NOx and particulate material concentrations in flue gas were decreased.