The 802.11 IEEE Standard has enabled low cost and effective wireless LAN services (WLAN). With the sales deployment of WLAN based networks exploding, many people believe that they will become fourth generation cellular system (4G) or a major portion it. However, small cell size creates frequent hand-offs for mobile users. If latency these is high, as previous studies have shown, then users synchronous multimedia applications such voice over IP (VoIP) experience excessive jitter. dominating...

User mobility in wireless data networks is increasing because of technological advances, and the desire for voice multimedia applications. These applications, however, require fast handoffs between base stations to maintain quality connections. Previous work on context transfer has focused reactive methods, i.e. occurs after mobile station associated with next or access router. In this paper, we describe use a novel efficient structure, neighbor graphs, which dynamically captures topology...

A variety of wireless technologies have been standardized and commercialized, but no single technology is considered the best because different coverage bandwidth limitations. Thus, interworking between heterogeneous networks extremely important for ubiquitous high-performance communications. Security in a major challenge due to vastly security architectures used within each network. The goal this paper twofold. First, we provide comprehensive discussion problems current 3G WLAN systems....

An optically efficient liquid-crystal display (LCD) structure using a patterned quantum dot (QD) film and short-pass filter (SPF) was proposed fabricated. The QD contributed to the generation of 95% in area ratio (or 90% coverage ratio) Rec. 2020 color gamut. This achieved by avoiding problem interaction between white backlight broad transmittance spectra filters (CFs) as seen conventional LCD with mixed reference. can maintain narrow bandwidth green red colors before passing through CFs....

WLEDs fabricated by direct incorporation of QDs into silicone resins using the thiol group exhibit enhanced color conversion and luminous efficiency with high stability.

An efficient package configuration for a white-light-emitting diode based on quantum dot (QD) phosphors was proposed and fabricated with polymer lens, remote QD layers, an air-gap structure. The optical extraction efficiency of the newly structure showed enhancements 33.0% by simulation 29.7% experiment as compared that layer-by-layer without air gap. This enhancement comes from fact some reemitted scattered light QDs can be reflected effectively total internal reflection at interface...

We proposed an optical simulation model for the quantum dot (QD) nanophosphor based on mean free path concept to understand precisely performance of optoelectronic devices. A measurement methodology was also developed get desired characteristics such as and absorption spectra QD nanophosphors which are be incorporated into simulation. The results QD-based white LED OLED displays show good agreement with experimental values from fabricated devices in terms spectral power distribution,...

This paper discusses the design of a high efficient battery charger and control technique for EV fast charger. Existing systems used two-stage (AC/DC, DC/DC) as single module to increase output power. However, existing method has problem increasing unit price number AC/DC converters also increases. study proposes overcoming this using 25-kW efficiency that uses converter four DC/DC modules. In addition, with structure was applied maximum tracking, Vienna rectifier were conducted accordingly....

Abstract A new structure for white organic light-emitting diode (OLED) displays with a patterned quantum dot (QD) film and long pass filter (LPF) was proposed evaluated to realize both high color gamut optical efficiency. Since efficiency is critical parameter in OLED gamut, red or green QD as color-converting component an LPF light-recycling are introduced be adjusted via the characteristics of (CF). Compared conventional without LPF, it confirmed experimentally that powers light display...

The electric vehicle market is rapidly growing due to its environmental friendliness and governmental support. As vehicles are powered by electricity, the interoperability between chargers made multiple vendors crucial for success of technology. Relevant standards being published, but methods conformance testing need be developed. In this paper, we present our test system charger in accordance with ISO/IEC 15118, IEC 61851 61850-90-8. Our leverages TTCN-3 framework flexibility productivity....

Abstract An optically efficient structure was proposed and fabricated to realize high brightness organic light emitting diode (OLED) displays based on a white OLED prepared with the air-gapped bridges quantum dot (QD) patterns. Compared conventional display, in our experiments, optical intensity of display shows enhancement 58.2% red color 16.8% green after applying bridge QD patterns 20 wt% concentration. This comes from two facts that downconvert unnecessary blue or blue/green required...

This study explored how an educational program on hematopoietic stem-cell donation (HSCD) affects the knowledge, attitude, and willingness for HSCD among nursing students. The subjects were students at a university in Korea: 43 experimental group 42 control group. All took pre-test, only attended program. Both groups completed two post-tests. Variables of interest willingness, registration ratio HSCD. increased knowledge (F = 8.093, p < 0.001) attitude −6.422, experiment After program,...

A facile purification method for oxidized carbon nanotubes (CNTs) is developed to preserve acidic compounds (ACCs) achieving high-quality dispersion of CNTs. The remaining ACCs, which originated from the surface destruction CNTs during oxidation process, are considered play a crucial role in water and various polar protic solvents. To elucidate concrete direct titration applied quantitatively investigate degree ionization both ACCs their aqueous dispersions. While with strong carboxylic...

Recently various types of driver assistance systems have been used for automobiles. In 2008, the U.S Congress passed a law which required that most cars be equipped with devices to warn objects behind vehicle. Because that, market rear view cameras is expected rise dramatically. Therefore many suppliers try provide wide angle camera car makers. But high distortion caused by might result in lower image quality. order improve quality, normally we use an algorithm correct distortion. Though can...

As the observation of obstetrical patients with diverse complications is increasingly rare in clinical training, computerized high-fidelity simulators can greatly benefit nurse education. However,simulation scenarios nursing are not well studied. This study aims to develop simulation for that (1) demonstrate situations from prenatal, labor and delivery, postpartum phases (2) provide educational tools student evaluation weakness identification. We developed four scenarios: delivery I, II,...

An image-space telecentric lens for an intra-oral 3D scanner was designed and fabricated dental application. Since a function can provide the same results regardless of image plane position, it helps to realize more accurate scanner. The performance meets required properties HD resolution. In particular, lateral color is corrected within 1 pixel. This system achieves depth focus than 3 mm. For user convenience, developed consists prism part imaging part. Both parts are optimized reduce front...

The crystallinity of the photoactive layer in organic solar cells is a key parameter for improving charge carrier transport. To form highly crystalline poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-b]thiophenediyl]] (PTB7:PCBM), we developed multi-temperature solvent annealing method with two-step process first performed at relatively low temperature 0 °C to induce stable crystal growth conductive PTB7 polymer without...