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This study reports the novel arc-based cantilevers for reducing the natural frequency of MEMS cantilever beams without the addition of tip/point mass. The results show an increased potential for energy extraction from naturally occurring vibration sources. An analytical model was used to model the effective mechanical properties of multilayered MEMS cantilevers while the natural frequencies were obtained...
With polyps being the main cause of colorectal cancer, accurate colon segmentation is a crucial step for polyp detection in a virtual colonoscopy system. This paper presents a fully automated segmentation framework for the colon which is based on convex formulation of the active contour model. Our approach is tested on 7 sets where the results are further validated for polyp detection. Results show...
In this study, a novel piezoresistor (PZR) design to improve the sensitivity of the piezoresistive type pressure sensor is reported. In this design, the PZR combined with various doping concentrations and doping depths is proposed and implemented. According to the design concept, the combined PZR which includes multiple piezoresistance coefficients would be arranged in a unique shape, just like a...
The mosquito proboscis is composed of seven micro parts. Among them, labrum and maxillae play important roles in insertion. The labrum is a central needle which sucks blood; two maxillae are left/right needles aside the labrum, respectively. They cooperatively move, i.e., one maxilla goes forward, labrum goes forward, another maxilla goes forward, successively. We noticed that the maxilla has a jagged...
We show that full saturation of the interface-located trap states by the photogenerated carriers under the femtosecond excitation in nano-Si/SiO2 results in the increase of the free carriers' lifetime and the quantum yield of the luminescence. The observed increase of the quantum yield is unexpected, in contrast to the commonly observed decrease under nanosecond excitation.
In some environments, such as among mountains, the installation of power supply systems is difficult. In such cases, a power supply independent of the Communication Bureau is necessary. Solar cells can be used as an independent power supply that requires little maintenance. To make most effective use of sunlight, this paper proposes the use of a three-dimensional photovoltaic module whose configuration...
We investigated the transmission enhancement and the suppression in rectangular holes array at terahertz range. Experiments and simulations verified that the metal film perforated with rectangular holes array had the shape resonance and the Wood-Rayleigh anomalies. With the development of previously reported theory, we explored the contribution of the shape of single hole and the periodicity of array...
The authors propose a universal method to form cylindrically-curved surfaces by dynamically bending in-plane a DRIE-etched flat vertical silicon plate with microactuator. The stiffness is designed position-dependent, thus allowing ideal curvature over large area.
The Flattened Light-Scattering Substrate (FLiSS) is a two-dimensional grating-based back reflector. Embedded in thin film silicon solar cells, it increases spectral response in the infrared region and delivers high-end open circuit voltage and fill factor, due to the roughness-free surface. An accurate three-dimensional optical modeling based on finite element method was carried out for implementation...
We present a very efficient, highly accurate, “Explicit Shape Regression” approach for face alignment. Unlike previous regression-based approaches, we directly learn a vectorial regression function to infer the whole facial shape (a set of facial landmarks) from the image and explicitly minimize the alignment errors over the training data. The inherent shape constraint is naturally encoded into the...
Dot formation mechanisms of single-electron transistors (SETs) and single-hole transistors (SHTs) are reinvestigated. “Shared channel” SET/SHTs in form of nanowire (NW) channel FETs are fabricated and characterized. It is suggested that, in addition to quantum confinement effect (QCE), the positive charges create parasitic dots in SHT channels resulting in multiple-dot SHTs. It is concluded that a...
Cone-beam CT images are useful in operative dentistry but suffer from a comparatively bad image quality with regard to the signal-to-noise ratio. Therefore, we use a statistical shape model (SSM) for robust segmentation of the mandible. In contrast to previous approaches, our method (i) is fully automatic in terms of both, the establishment of correspondence and the segmentation itself, and (ii) allows...
This paper presents the high speed microrobot actuation driven by permanent magnets in a microfluidic chip. The riblet surface, which is regularly arrayed V groove reduces the fluid friction and enables stable actuation in high speed. The comprehensive analysis of fluid force, the optimum design and its fabrication were conducted and proved the friction reduction by riblet. The Ni and Si composite...
The high performance application processors found in today's hand held wireless and mobile computing products, such as smart phones and tablet computers, require packages that can support demanding device performance and dense form factor requirements. The package architecture must enable the required signal routing, signal integrity, power delivery, physical form factor, manufacturability and cost...
As an ongoing research in our laboratories we are investigating the development of a gas ionization sensor (GIS). GIS is one of the most efficient gas sensors in terms of selectivity, reversibility, fast response time, low noise, and durability. This gas detector is based on breakdown of the gases inside two-parallel plates biased with high electric potential. The incorporation of the nanowires (NWs)...
We address an important issue in the design of concentric permutation code based vector quantizers to select the optimal integer partitions. We establish that, for concentric permutation code based vector quantizers, the optimum integer partitions exhibit monotonicity with its index. In addition, a reduced complexity encoding scheme for concentric permutation code based vector quantizers is presented.
Silicon carbide powder (SiCp) was milled in a high energy ball mill in 300 rpm for 8 hrs. The wet milling media was tungsten balls (WC) in chemical compound Toluene (C6H6-CH3).The milled powder then characterized by Atomic Force Microscope (AFM) to study topography and particle size analyzer.
We present the concept of Tool Affordances to plan a strategy for target object manipulation by a tool via understanding of bi-directional association between Actions, Tools and Effects. Tool Affordances include the awareness within robot about the different kind of effects it can create in the environment using an action and a tool. Robot learns tool affordances by exploring the environment through...
Due to the differences in the thermal expansion coefficients of copper and silicon, a large thermal stress develops at the interface between a Cu-filled via and both the insulation layer and the surrounding silicon when the structure is subjected to temperature loading. In this paper four TSV geometries are considered in an effort to investigate the role of via geometry on stress relief. Thermo-mechanical...
The authors have conducted experiments to measure personal space between a human and a humanoid robot using both a real and a VR (virtual reality) humanoid robot in order to evaluate the comfortable distance between them. The reason for using both a real and VR robot is to verify the effectiveness of VR. Using a VR robot, we can conduct experiments cheaply and safely because the robot has an unsubstantial...
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