No abstract

This paper describes the design of a high-efficiency vehicular roof-mounted antenna for wireless access for vehicular environment (WAVE) communication systems used for ubiquitous intelligent systems. The main objective of the ubiquitous intelligent system's automotive IT technology is to enhance the connectivity among vehicles to ensure seamless communication and to reduce the initial access time using high-performance antenna systems. The efficiency of WAVE communication systems used for ubiquitous intelligent systems depends on the antenna efficiency. The proposed vehicular antenna for WAVE communication systems shows an improvement of approximately 4.77 dB in the return loss, as compared with a conventional antenna system.

We modeled electrical tractor's system and driving parts using model-based design (MBD) and an automotive simulation model (ASM). Conventionally, researchers have used empirical approaches or have analyzed partial aspects of the system in order to develop an electrical tractor. Studies applying MBD to the parts and entire system of the electrical tractor, as is the case in the present study, have been next to non-existent. Therefore, we used the Simulink-based ASM and the Carsim, which simulate and interpret the dynamic characteristics of tractors, and analyzed the design factors of an electrical tractor. By simulating the driving system and conducting an actual test of the electrical tractor, we determined whether the electrical tractor is a suitable replacement for the existing mechanical tractor. This study could serve as the basis for research on the comprehensive dynamic interpretation necessary for designing an electrical tractor and could also provide guidelines for designing an electrical motor-based system.

No abstract

High contrast grating (HCG) is the structure made up of the sub-wavelength grating of high-index and the surrounding layer of low-index, which reveals high contrast between two materials. Its advantages include high reflectivity over a broad bandwidth, polarization and wavelength selectivity, optical high-Q resonator, and phase modulation. In this work, the HCG structure comprising of indium tin oxide (ITO) and Silicon (Si), for the surrounding layer and the grating layer respectively, was studied. Its theoretical model was established, and transmittance, phase and optical behavior were calculated by rigorous coupled-wave analysis and finite element method. Furthermore, the established structure was fabricated to validate its feasibility. The fabricated structure shows the focusing capability whose length is about 10 µm, and the feasibility of the structure was demonstrated. It is also meaningful that ITO layer can contribute to the fabrication of the HCG structure, leading to enable the structure to be electrical-driven.