• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.11 no.5
• /
• pp.8-12
• /
• 2012

Recently, a wide range of industrial production area has a competitive advantage through cost reduction. Moreover with the development of industrial technology, base material and cutting tool help the machining technology. But most of the machining enterprises have not hold the R&D facilities and human resources. This mainly disturbs the industrial development and th increase of production efficiency. Especially in the interrupted machining process, it showed different behavior with continuous machining process. So it needs to research and develop the tool life and tool wear mechanism analysis.

• Journal of Sensor Science and Technology
• /
• v.7 no.1
• /
• pp.39-44
• /
• 1998

Low reflectance optical fiber mirrors in the continuous length of the single mode fiber were fabricated using mechanical splices and pieces of fiber coated with $TiO_{2}$ dielectric film at the cleaved end. When fiber mirrors of refelctance of about 1% were produced, the insertion loss ranged from 0.055dB to 0.3dB and the average insertion loss was 0.15 dB. These mirrors could be produced easy in the field.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 1994.10a
• /
• pp.590-596
• /
• 1994

In a CGL(Continuous Galvanizing Line) in steel making plants, zinc-coated steel sheets are produced. These sheets are used where long running corrosion resistivity is required. During the coating process top dross is produced, being harmful to the quality of the coating. To collect and remove this top dross, an automation system is developed consisting of a robot and its carriage system, a pot level sensor, a system controller, and specialtools. Forthe first, the level of the pot must be measured and fed back to the robot controller to avoid submersion of the robot hand in the hot pot. In this paper,acoustic and laser distance sensors are tested for the appropriate pot lvel sensor, especially the former in the view point of hot environment.

• Food Science and Biotechnology
• /
• v.16 no.6
• /
• pp.999-1005
• /
• 2007

An oil-in-water (O/W) emulsion [20 wt% com oil, 0.5-6.0 wt% fish gelatin (FG), pH 3.0] was produced by high pressure homogenization, and the influence of pH, protein concentration, and homogenization condition on the formation of FG-stabilized emulsions was assessed by measuring particle size distribution, electrical charge, creaming stability, microstructure, and free FG concentration in the emulsions. Optical microscopy indicated that there were some large droplets ($d>10\;{\mu}m$) in all FG-emulsions, nevertheless, the amount of large droplets tended to decrease with increasing FG concentration. More than 90% of FG was present free in the continuous phase of the emulsions. To facilitate droplet disruption and prevent droplet coalescence within the homogenizer, homogenization time was adjusted in O/W emulsions stabilized by 2.0 or 4.0 wt% FG. However, the increase in the number of pass rather promoted droplet coalescence. This study has shown that the FG may have some limited use as a protein emulsifier in O/W emulsions.

• Journal of the Korean Crystal Growth and Crystal Technology
• /
• v.3 no.1
• /
• pp.75-84
• /
• 1993

Copper coating on graphite powders was carried out by cementation process from copper sulfate solution. Effects of operation variables such as copper ion concentration, stirring speed, reaction time and temperature were investigated to obtain optimum conditions for continuous and uniform copper coating on graphite powders. The activation energy of the copper coating process was found to be 3. 59kcal/mole.

• Journal of the Optical Society of Korea
• /
• v.17 no.5
• /
• pp.428-432
• /
• 2013

This research presents a flexible reflective thermochromic display (TCD) comprised of thermochromic pigments and a patterned indium tin oxide (ITO) film coated on a polyethylene naphthalate (PEN) substrate, and the display's thermo-optical characteristics. The display showed maximum red, green, and blue reflectances of 30%, 38%, and 29%, respectively. Furthermore, the display exhibited a continuous grey color when the temperature was changed continuously. As a flexible display, the display showed reliable thermo-optical performance without image damage even when highly bent. We expect the proposed TCD will be used in outdoor information display applications where low cost is a key factor.

• Journal of Magnetics
• /
• v.14 no.1
• /
• pp.31-35
• /
• 2009

Herein, the Magneto-Optical Kerr Effect (MOKE) signal enhancement in nanostructures in investigated. It is well known that the MOKE signals of ferromagnetic thin films are enhanced with an additional dielectric layer due to multiple reflections. The MOKE signal is modulated with the additional dielectric layer thickness and is at a maximum when reflectivity is at a minimum. This is not always true in the nanostructures due to the contribution from the non-magnetic substrate portion, especially when substrate reflectivity is minimized and the dependence of the additional dielectric layer thickness for the nanostructure is changed in the case of the continuous thin film. We showed that the MOKE signal for nanostructures could be enhanced with a properly designed, dielectric layer in addition to the anti-reflection coated substrates.

• Economic and Environmental Geology
• /
• v.32 no.6
• /
• pp.575-584
• /
• 1999

Through alkaline hydrothermal activation processes, zeolite minerals were synthesized from fly ashes produced at Youngwol and Boryoung power plants. The syntheses were performed in a closed teflon vessel with a teflon-coated magnetic bar for continuous stirring during the reaction periods. The experiments were caeeied out at three different reaction temperatures ($100^{\circ}C$,$200^{\circ}C$, and $250^{\circ}C$), with varying NaOH concentations (0.5~8N) and reaction time (24 to 288 hours). Mineralogical characterization of the reaction products indicated that Na-p1, analcime, and hydroxysodalite were dominant zeolites formed from the both fly ashes at the given experimental conditions, The highest amount of zoelites produced from the Youngwol and Boryoung fly ash were:60 and 45wt%for Na-P1, 70 and 45wt% for analicime, 50 and 40wt% for hydroxysodalite, respectively. A small amount of zeolite A was present in NaP-dominant dample is about 250 meq/100g. This suggests the possibility of its utilization as an ion-absorbent.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.14 no.6
• /
• pp.974-978
• /
• 2011

The beam-matter interaction with various coating effects has received continued attention in the high power laser community. Previous works suggest that coatings promote target damage when compared to beaming on uncoated surface. Three types of paint coatings(Acrylic urethane, Silicone alkyd and Stealth blend) and a water coat on metals(Al, Ti and STS) are irradiated with a $CO_2$ laser. Both strain and temperature measurements are provided for assessing the instantaneous response characteristics of each coating on different metals. A selective combination of surface coats with metals has proven effective in either preventing or enhancing damage, both thermal and mechanical, associated with focused beaming on a target.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2000.02a
• /
• pp.152-152
• /
• 2000

차세대 평판 디스플레이로 주목박고 있는 FED는 현재 저전압 환경에서 기존의 CRT와 비슷한 해상도와 밝기를 얻지 못하고 있다. 이는 형광체 입자의 표면에 존재하는 결함, 오염, band - bonding과 같은 비발광층과 제조공정 중에 산화되거나 공기중에 노출되어 막 표면이 쉽게 오염되기 때문이다. 따라서 본 연구에서는 전기영동법으로 제작된 형광체의 효율 향상을 위해 레이저 표면 처리효과를 연구하였다. 실험에 사용한 레이저 표면처리 방법은 Nd:YAG pulse(355nm), continuous laser를 이용하였으며 레이저 power와 처리 시간을 변화시키면서 실시하였다. 형광체 막의 표면 두께 측정을 위해 Scanning Electron Microscopy(SEM), 처리된 막의 발광세기를 비교 분석하기 위해 Photoluminescence(PL), Cathodoluminescence(CL) intensity를 측정하였다.