In this paper, we investigate the nature of DMA mechanism wherein there is an explicit product-consume relationship. Base on this observation we propose a DMA Cache technique to improve performance of DMA operations. To evaluate this technique, we adopt a hardware-based memory trace collection tool and an FPGA-based tracedrive emulation system. Experimental results show that DMA Cache can impro...

In this paper a computational model called dynamic medial axis (DMA) is proposed to describe the internal evolution of planar shapes. To define the DMA, a symbolic representation called matching list is proposed to depict the topological structure of the medial axis. As shown in this paper with provable properties, the DMA exhibits an interesting dynamic skeleton structure for planar shapes. Fi...

Copying data from devices into main memory is a computationally-trivial, yet time-intensive, task. In order to free the CPU to perform more interesting work, computers use direct memory access (DMA) engines — a special-purpose piece of hardware — to transfer data into and out of main memory. We show that the ability to chain together such memory transfers, as provided by commodity hardware, is ...

This paper describes implementation of DMA controller of AMBA Bus with two masters using VHDL. DMA controller is a synthesizable soft IP core connected to the AMBA AHB Bus for easy integration into SOC implementation. The Direct Memory Access (DMA) Controller is a hardware feature that enables movement of blocks of data from peripheral to memory, memory to peripheral or memory to memory. This m...

We have identified the dimethylamine-trimethylamine complex (DMA-TMA) at room temperature in the gas phase. The Fourier transform infrared (FTIR) spectrum of DMA-TMA in the NH-stretching fundamental region was obtained by spectral subtraction of spectra of each monomer. Explicitly correlated coupled cluster calculations were used to determine the minimum energy structure and interaction energy ...

We synthesised and toxicologically characterised the arsenic metabolite thiodimethylarsinic acid (thio-DMA(V)). Successful synthesis of highly pure thio-DMA(V) was confirmed by state-of-the-art analytical techniques including (1)H-NMR, HPLC-FTMS, and HPLC-ICPMS. Toxicological characterization was carried out in comparison to arsenite and its well-known trivalent and pentavalent methylated metab...

The biopharmaceutical industry characterizes and quantifies aggregation of protein therapeutics using multiple analytical techniques to cross-validate results. Here, we demonstrate the use of electrospray-differential mobility analysis (ES-DMA), a gas-phase and atmospheric pressure ion-mobility method for characterizing protein aggregates. Two immunoglobulin Gs are systematically heat treated t...

Poaceae plants release 2'-deoxymugineic acid (DMA) and related phytosiderophores to chelate iron (Fe), which often exists as insoluble Fe(III) in the rhizosphere, especially under high pH conditions. Although the molecular mechanisms behind the biosynthesis and secretion of DMA have been studied extensively, little information is known about whether DMA has biological roles other than chelating...

Dimethylammonium salt of 2,4-dichlorophenoxyacetic acid (DMA-2,4-D) is a widely used herbicide that is considered moderately toxic. In the present study we found that DMA-2,4-D is able to cause apoptosis in peripheral blood lymphocytes of healthy individuals and Jurkat T cells. Apoptosis induced by DMA-2,4-D was dose and time dependent, independent of Fas, TNF receptor 1 or the aromatic hydroca...