This paper presents a technique for embedding information into a 3D object. The technique can rewrite the information non-destructively. Information can be rewritten into the object using magnetization and demagnetization from the outside of the fabricated object. We are studying the factors that can make more clear readability and effective rewritability in embedding data into 3D objects. One factor is the amount of magnetic filament that we use for representing the information in each position. We found that the strength of the magnetic field varies in accordance with the amount of filament. In this way, we can control the size, frequency, and capacity of future embedded information.

In order to achieve high-fidelity representation of colors, it needs to do some purposeful interference when colors are conversed, so the color gamut mapping which is the main technology to ensure visual matching would be used during this process. And the accurate visualization of out-of-gamut between images and devices plays an important role in color gamut mapping, so a method of the 3D visualization of out-of-gamut in graphic communication based on segment maxima algorithm was proposed in this paper. And this method mainly had two steps, the first step was that the device color gamut boundary points could be obtained when used the color conversed information in digital output device profile, so as to generate accurate device color gamut. The next step was that out-of-gamut points could be obtained through making comparison between device gamut and digital image gamut, as result that the area of out-of-gamut could be presented in digital images and image gamut according to the out-of-gamut cloud dots. The advantages of this method were that it can encourage us to predict whether the image gamut is beyond the output device gamut in advance, and then it can help us to select appropriate color gamut mapping algorithm according to the result of out-of-gamut judgment, so as to realize the accurate reproduction of colors.

Coatings based on hydroxypropylated starch (HPS) provide extraordinary print density with dye-based inkjet inks, but their suitability for pigment-based inks can be limited due to inadequate carrier medium (water) absorption and colorant fixation. In the present work, HPS-based coatings were tailored for both a pigmentbased and a dye-based ink by adding silicate minerals or acid clay (both Lewis and Brönstedt acid sites present in the acid clay). Substrate-ink interaction and colorant distribution were investigated via uncoated gloss and print quality indicators such as print density, ink bleeding tendency and delta gloss after printing with desktop printers. Three-dimensional z-stack CLSM images taken from printed samples revealed substantial differences in ink holdout and penetration characteristics between the studied materials. Pigment-filled HPS coatings showed up to 60% increase in print density compared to uncoated reference substrate and an increase of up to 35% compared to plain HPS coating with dyebased inks. In case of pigment-based ink, the increase was 17% between plain HPS coating and acid-clay-filled HPS coating. In addition, a combination of HPS and silicate mineral decreased ink bleeding substantially, but lower print gloss compared to substrate initial gloss was observed with the majority of experimental coatings. It was found that the pigment type affects substantially the unprinted gloss, which is naturally high in the case of pure HPS coating, but also the observed drastic difference in substrate permeability may explain the differences in print quality. The findings suggest that coating morphology, together with chemical interactions between starch and mineral and coated substrate and ink, has a key role in achieving high gloss and good print quality.

Novel manufacturing methods for flexible, light weight and cost-efficient electronics have gained high interests in the recent years, especially the additive printing technologies are of major relevance. Here, the digital inkjet printing technology is an attractive printing method due to its additive, high precision and upscalable deposition process. One of the key components of a printed electronic device, such as capacitor, transistor and sensor, is the conducting track. A major requirement is the device dependent electrical performance induced by an appropriate post treatment process. Traditional thermal sintering via an oven or hotplate requires on one hand long sintering times (up to minutes and hours) and on the other hand high sintering temperatures (above 150 °C - 300 °C), which are unsuitable for flexible polymeric foils with low glass transition or melting temperature. However, the novel method of intense pulsed light (IPL) sintering has great potential when it comes to the fabrication of functional layers on thin, flexible and temperature instable polymeric foils. In our research, the IPL sintering methodology is used to convert printed liquid films into solid and conducting metallic layers on various flexible polymeric substrates, like Polyethylene terephthalate (PET), Polyethylene naphthalate (PEN) and Polyimide (PI). Based on their glass transition temperature as well as applied energy densities the defect formation in the micrometer rang was analyzed. Furthermore, the electrical performance was measured and the conductivity calculated. It was found, that the substrate material property in terms of glass transition temperature and melting point have a prominent influence on the defect rate and the electrical performance.

One of the most frequent durability issues in laser printer system is the failure of thin metal sleeve in the fuser assembly. In order to ensure the reliability of the laser printer, it is important to predict the failure of the thin metal sleeve in the fuser assembly. In this study, the method to predict fatigue life of fuser SUS sleeve with 3D dynamic simulation and fatigue simulation using ABAQUS and FEMFAT is introduced. Fatigue property of fuser SUS sleeve is correlated with MIT folding endurance test results and safety factor is calculated to endure the product life specification.

In recent days, green technology that is based on solar cell is highly focused for sustainable society. So, the efficiency of Si type of solar cell is drastically improved. On the other hand, dye-sensitized solar cell (DSC) is also highly focused because of flexibility and design in spite of low efficiency. To clear the low efficiency problem, many studies on the development of dye and titania were carried out. Because the dye was developed, then the absorbed wavelength became broad and the absorption ratio on each wavelength was increased. Due to the study on titania, unique shapes of titania were suggested and the absorption characteristics were improved. In spite that many studies on chemical view were carried out, few studies on fabrication process were carried out. So, we focused on fabrication of titania layer of DSC. Usually, the titania layer was fabricated by the doctor blade method or the screen print method. The inside of the fabricated titania layer utilizing the ordinary method had little porous. In the case that the porous titania layer was formed, then the flow of electricity was increased due to the increased surface of titania layer. We applied the electrostatic inkjet method for fabrication of the titania layer because the porous layer was formed due to evaporation effect utilizing the electrostatice inkjet method. We already formed porous titania layer and achieved the efficiency improvement. In this paper, we investigated the fundamental characteristics on fabrication of porous titania layer utilizing the evaporation effect. The experimental set-up to investigate the characteristics was shown as follows. Titania paste was filled with the ink tank. Nozzle was installed at the end of the tank. FTO glass electrode was set on the XY linear stage and the rotation stage. When the high voltage was applied between the nozzle and the glass electrode, small droplets were ejected because the electrostatic inkjet method was took place. Formation and ejection of the small droplets were observed with a high-speed camera and a light. The evaluation of the porous titania layer was carried out with the SEM and XRR. We investigated the characteristics of the porous titania layer in case that the rotation speed was changed.

A method is demonstrated for studying hydrodynamic effects in pulsed electrohydrodynamic (EHD) jetting, for the drop-on-demand printing of small droplets. The transient behaviour of pulsed EHD jets and the deposition of liquid on to a substrate were investigated by using an ultra-high speed camera (Shimadzu HPV-1) with a Newtonian aqueous liquid (water-glycerol). Time-resolved images of jets induced by two consecutive voltage pulses, with different time delays, were captured. Image analysis was used to determine the jet length, meniscus radius at the nozzle, and deposit volume in each case and revealed that the behaviour of an EHD jet depends strongly on the delay time after a previous ejection event. The effect originates in the time taken for the meniscus shape and position to recover to their equilibrium values and plays a critical role in the design of printing strategies for EHD drop-on-demand applications. It is possible that the maximum printing frequency achievable by pulsed EHD jetting can be increased by optimizing the drive waveform in order to accelerate recovery of the meniscus position.

This report describes the development of a gas sensor platform based on all solution-processed bottom-gate bottom-contact organic field-effect transistors that operate at ≤ -2 V. The sensor was able to detect ammonia as low as 600 ppb under high relative humidity (RH=80%).

One of the persistent problems in the development of laser printer is paper wrinkles in fusing process. Factors affecting this problem are due to internal factors of fuser and layout factors between transfer roller and fuser. This paper suggests modeling methods to simulate mechanical characteristics to predict the possibility of paper wrinkle in fuser by change of layout parameter. Layout parameters are relative position and angle of fuser about transfer roller and inlet guide position from fuser nip. Through 3D dynamic simulation, it calculates the compressive plastic strain of the paper passing through the fuser unit, and wrinkle criteria were set up on the basis of jig experiments. The analysis method can be extended to a variety of practical paper wrinkle problems, and the scalability is considered high. The usefulness of these methods was validated by the comparison with experimental results.