• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2003.05a
• /
• pp.183-186
• /
• 2003

The system realization of 2D barcode electrothermal printer for the adapted scanner recognition is presented. The 2D barcode leads the horizontal and vertical definition to recognize the scanner being an important part in system. The high definition electrothermal printer of 300dpi resolution used power historic control technique to vertical and horizontal coordinate is realized. The result of experiment is that the system enhances the quality of print image to require recognizing 20 barcode.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.10 no.2
• /
• pp.243-247
• /
• 2009

Primary charging roller is rotated with contacting surface of OPC drum and take charge OPC drum. Owing to this reason, primary charging roller is made by elasticity substance with electric conduction. Properties of charging and image is changed by class of coating, method of coating and environment. This study developed coating material and coating method to make print image of good quality.

• Journal of the Korean Graphic Arts Communication Society
• /
• v.22 no.2
• /
• pp.1-12
• /
• 2004

In lithography based on repulsion of ink and water emulsification is inevitably generated. Thus it is necessary to analyze relationship between printability and physical and chemical properties of emulsified ink. Transfer rate of ink is one of the important factor deciding print quality. And it is closely concerned with rheological properties of emulsified ink. Rheological properties such as flow, yield, plastic viscosity, creep, oscillation and tack tests were measured. In order to examine printability of emulsified ink, ink transfer equations, density, ink film thickness and gloss were measured.

• Journal of information and communication convergence engineering
• /
• v.7 no.4
• /
• pp.442-448
• /
• 2009

This paper proposes a fingerprint image processing algorithm to accurately extract minutiae in the process of fingerprint recognition. We improved the matching accuracy of low quality fingerprint images by using effective ridge vector and ridge probability. The proposed algorithm improves the clarity of ridge structures and reduces undesired noise. We collected thumb print images from 10 individuals 5 separate times each, in total using 50 thumbprints. We registered one of the five thumbprint images from each individual to match the registered one with the other four thumbprint images, and alternated the registered thumbprint image. We matched thumbprints 20 times for each individual. In total, we conducted 200 matches for the thumbprints from the 10 individuals. We improved the verification accuracy and reliability compared to conventional methods.

• Journal of Institute of Control, Robotics and Systems
• /
• v.10 no.4
• /
• pp.317-324
• /
• 2004

The ink jet printer media advance system is required to be exactly driven to the target position via tracking the reference velocity profile to obtain the high quality print image. A single gain PID controller is not sufficient to fulfill the control objectives, the exact velocity tracking and the accurate positioning, at the same time. A dual PID controller and its switching strategy are presented in this paper to achieve the control objectives. The media advance system is controlled by two separate PID controllers, one of which is for velocity control, and the other is for position control. A PID controller controls the velocity of the media advance system until it reaches the predetermined switching position. When the media advance system passes the predetermined position, the controller is switched to the other PID controller which is more profitable for exact positioning. The switching position is determined by the estimated stop distance. The simulation and experimental results are presented to show the validity and effectiveness of the proposed controller.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.9 no.2
• /
• pp.11-15
• /
• 2013

We in order to use WLAN communication device planned wireless USB dongle internal antenna of 2.4 GHz/5.8 GHz band. So it uses square patch dual-wideband and quality is satisfactory and it designed print folded monopole antenna of the shape which is simple. The thickness of the antenna was fed by a $50{\Omega}$ coaxial cable feeding 1mm dielectric constant 4.4 FR4 substrate was used. The overall size of the antenna is $20mm{\times}50mm$. So the internal antenna is suitable. Measurement results of the fabricated antenna, the return loss of more than 10 dB in the two bands could be obtained. Radiation pattern has a maximum gain of 3.75 dBi value.

• Journal of the Korean Graphic Arts Communication Society
• /
• v.24 no.1
• /
• pp.1-12
• /
• 2006

The rheological characteristics of an ink relate to its performance on the press and to the printing quality such as ink stability, transfer characteristics, mottle, squash, misting, dot gain, and so on. For lithographic print, the emulsification of ink is an important factor to determine the product. And also the rheological characteristics of the emulsified ink should be investigated. Thus, in this study, the effects of the changing molecular weight of rosin modified phenolic resin on the water-pickup ratio of neat inks were studied. And then rheological properties of neat inks and emulsified inks with changing molecular weight of rosin modified phenolic resin were analyzed by using rotational rheometer.

• Journal of the Korean Society for information Management
• /
• v.14 no.2
• /
• pp.249-268
• /
• 1997

Unlike most print resources such as magazines and journals that go through an filtering process (e.g. editing, peering review), information in world Wide Web and Internet is mostly unfiltered. Using and citing information found over Web may not be reliable or authoritative. Therefore it is necessary to develop skills to evaluate what we found on the net. Fifteen evaluation documents for WWW are collected, analyzed from digital sources of U. S. academic libraries and common criteria for evaluating WWW resources are developed. Also several practical steps were made to overcome the quality problems.

• Journal of the Korean Graphic Arts Communication Society
• /
• v.29 no.3
• /
• pp.1-16
• /
• 2011

In these days, according to increased environmental regulations, to reduce the VOC content in paints and inks efforts are now in progress. A lot of research have progressed hydrocarbon solvents substitute with vegetable oil or ester in the printing ink but it is restricted to use vegetable oil in the inks because of high molecular weight and viscosity. Oil ester currently developed for printing inks still have some drawbacks, but overall the printability and print quality when using ester than hydrocarbon solvents are showing good results. Thus, in this paper, I studied about the properties variation of the varnish and inks according to vegetable ester, after I reacted vegetable ester using the vegetable fatty acid and ethyl alcohol, butyl alcohol. The compared in order of average molecular weight by the GPC method, rheological properties were found by rotational rheometer, and emulsion behavior were compared by high speed emulsification tester.

• Journal of Korea Society of Digital Industry and Information Management
• /
• v.4 no.2
• /
• pp.93-100
• /
• 2008

After free trade, it is increasing to import crops, aquatic products, and livestock which are produce in a foreign land. But it is affect negatively to trust relationships and markets of Jeju's foods because of breaking it out that foreign productions exchange domestic. Therefore, this paper designed and implemented the Genuine Quotation system of Black pigs using UHF RFID. This system is developed for distinguishing spuriousness, then searching information of the product through EPC ONS in EPCIS to print within a screen. Moreover, this intuitional and efficient system is constructed by connecting various sensors and lights. It can be contributed income increase thorough the security for the quality authority of the agricultural & stockbreeding products with FCS, FCG Certificate and the genuine certificate of the black pig which is the one of most typical agricultural & stockbreeding products in the pure Green Province, Jeju.