Bubble Dynamics in a Narrow Rectangular Channel

It is very important to study the bubble dynamics in order to understand the physical process of boiling heat transfer in a narrow channel. Experimental and theoretical studies on bubble dynamics in a narrow rectangular channel are proposed. The cross section of the narrow rectangular channel is 2 mm × 8 mm. A high speed digital camera is applied to capture bubble behaviors from the narrow side and wide side of the narrow rectangular channel. Bubble growth rate, bubble departure diameter, bubble interface parameter and others are obtained according to the observation. A force balance analysis on a growing bubble is proposed to predict the bubble departure diameter and sliding bubble velocity, and the predicted results agree with the experimental data. Thus, the mechanism of bubble departure, slide and lift-off behavior in a narrow rectangular channel can be explained by the analysis of forces

Bhs: An Novel Scheduling Strategy on Modern Processors

AbstractIn order to design a faster CPU, it is becoming more and more complex on the CPU architecture. But many-core is incompatible with the current programming mode designed for single-core CPU. This paper proposes a Block level Hardware-based Scheduling (BHS) on many-core architecture. The two main features are: First, design and implement a block-based hardware scheduler to reduce the overhead of threads, and to get a faster communication between processing units; second, it is very applicable to small and scalable cores on many-core architecture that is tightly coupled in the cores group, loosely coupled between groups. And a variety of parallel techniques would effectively exploit

Comparing empirical kinship derived heritability for imaging genetics traits in the UK biobank and human connectome project

Imaging genetics analyses use neuroimaging traits as intermediate phenotypes to infer the degree of genetic contribution to brain structure and function in health and/or illness. Coefficients of relatedness (CR) summarize the degree of genetic similarity among subjects and are used to estimate the heritability – the proportion of phenotypic variance explained by genetic factors. The CR can be inferred directly from genome-wide genotype data to explain the degree of shared variation in common genetic polymorphisms (SNP-heritability) among related or unrelated subjects. We developed a central processing and graphics processing unit (CPU and GPU) accelerated Fast and Powerful Heritability Inference (FPHI) approach that linearizes likelihood calculations to overcome the ∼N2–3 computational effort dependency on sample size of classical likelihood approaches. We calculated for 60 regional and 1.3 × 105 voxel-wise traits in N = 1,206 twin and sibling participants from the Human Connectome Project (HCP) (550 M/656 F, age = 28.8 ± 3.7 years) and N = 37,432 (17,531 M/19,901 F; age = 63.7 ± 7.5 years) participants from the UK Biobank (UKBB). The FPHI estimates were in excellent agreement with heritability values calculated using Genome-wide Complex Trait Analysis software (r = 0.96 and 0.98 in HCP and UKBB sample) while significantly reducing computational (102–4 times). The regional and voxel-wise traits heritability estimates for the HCP and UKBB were likewise in excellent agreement (r = 0.63–0.76, p \u3c 10−10). In summary, the hardware-accelerated FPHI made it practical to calculate heritability values for voxel-wise neuroimaging traits, even in very large samples such as the UKBB. The patterns of additive genetic variance in neuroimaging traits measured in a large sample of related and unrelated individuals showed excellent agreement regardless of the estimation method. The code and instruction to execute these analyses are available at www.solar-eclipse-genetics.org

An Implementation of Power-aware Storage Architecture

Nowadays, large storage is becoming an important feature of mobile embedded systems as their media functions are getting increasingly powerful and popular. However, no low power cost memory can provide sufficient capacity at low cost. And much higher power consumption of large capacity storage devices such as Microdrive is hard to be accepted. In this paper, we propose a logical storage layer over hybrid storage device composed of flash memory and Microdrive to provide file systems to embedded systems with minimal impact on battery runtime and power consumption. The result shows that the architecture can provide 32 times as much capacity with 10-15 % battery runtime impact

Embedded System Education in Zhejiang University

Abstract: Embedded system becomes more and more useful in all of the domain of our society. An embedded system education in universities is an urgent requirement. College of Computer Science of Zhejiang University is trying to improve its education in embedded system. This paper describes the achievement Zhejiang University has accomplished since 2002. Key–Words: Embedded System, Curriculum, Course reformation, Embedded Softwar

Communication Protocol Decomposition and Component-based Protocol Submodule

Abstract. Due to evolving network technologies as well as increased and varying demands of modern applications on embedded systems, general-purpose protocol stacks are not always adequate. We examine the usefulness of component-based software engineering for the implementation of software communication systems. We present an architecture that allows dividing protocol software into fully de-coupled components. By plugging required components together, that is, loading proper protocol submodules for communication services, we rapidly prototype flexible, robust, and application-tailored communication protocols. The primary goal is the configurability of communication services, that is, the configurability of protocol submodules for each communication service according to application requirements and network capabilities. The achieved communication system supports efficiently and coordinately the multiple communication services customized by the coexisting applications