We report the initial results of GaAs and GaInP solar cells grown by all solid-state molecular-beam-epitaxy (MBE) technique. For GaAs single-junction solar cell, with the application of AlInP as the window layer and GaInP as the back surface field layer, the photovoltaic conversion efficiency of 26% at one sun concentration and air mass 1.5 global (AM1.5G) is realized. The efficiency of 16.4% i...

Smart power ICs, which monolithically integrate low-loss power devices and control circuitry, have attracted much attention in a wide variety of applications [1], [2]. Commonly used smart power devices are the LDMOS and LIGBT implemented in bulk silicon or SOI (Silicon on Insulator). One of the key issues in the realization of such ‘smart power’ technology is the isolation of power devices and ...

Applications and operating systems can be augmented with extra functionality by injecting additional middleware into the boundary layer between them, without tampering with their binaries. Using this scheme, we separate the physical resource bindings of the application and replace it with virtual bindings. This is called virtualization. We are developing a virtualizing Operating System (vOS) re...

We initiate study of the use of ‘secure tunnel’ protocols, specifically IPsec, and its availability and performance guarantees to higher-layer protocols, in particular TCP, against Denial/Degradation of Service (DoS) attacks. IPsec is designed to provide privacy and authentication against MITM attackers, and employs an anti-replay mechanism to ensure performance. For our analysis, we define a n...

MOTIVATION Predictions of protein local structure, derived from sequence alignment information alone, provide visualization tools for biologists to evaluate the importance of amino acid residue positions of interest in the absence of X-ray crystal/NMR structures or homology models. They are also useful as inputs to sequence analysis and modeling tools, such as hidden Markov models (HMMs), which...

Daylight in classrooms is a critical factor in school design, in terms of its impact on students’ health, learning and visual performance. Providing adequate amount of evenly distributed daylight and glare prevention are important challenges in classroom design. Window configuration significantly affects the intensity and uniformity of daylight. This paper aims to investigate the effect o...

Abstract A circular ferroelectric tunnel junction (C-FTJ) is proposed for larger memory window and better endurance than a conventional planar FTJ (P-FTJ). The electrical characteristics of the C-FTJ are evaluated compared with P-FTJ by using device simulation. It confirmed that C-FTJs have more excellent switching P-FTJs because electric field becomes concentrated across layer. Also, show appl...

In this study, a sol-gel peroxotungstic acid sol was employed to deposit tungsten oxide (WO3) films by the spin-coating technique. In view of smart window applications, electrochromic windows were then designed and fabricated using a thin tungsten oxide film. For this purpose, Glass/ FTO/ WO3/ electrolyte/ FTO/Glass could be of use due to its special structure that consists of an electrochromic...