305 research outputs found

    Reconfigurable FIR Filter Coefficient Optimization in Post-Silicon Validation to Improve Eye Diagram for Optical Interconnects

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    Enhanced small form-factor pluggable (SFP+) is a specification for a new generation of optical modular transceivers. The devices are designed for use with small form factor (SFF) connectors, and offer high speed and physical compactness. SFP+ modules require high-quality ASIC/SerDes transmitters (Tx) because IEEE and fibre channel standards place strict requirements on the optical interface, and linear/limiting SFP+ module types have Tx paths that do not correct for timing jitter. This introduces a design challenge to guarantee performance over process, temperature, and voltage (PVT) conditions. Adjusting the Tx equalization across PVT and different interconnect channels can be a time-consuming task in post-silicon validation. In order to overcome this problem, this paper proposes a direct optimization method based on a suitable objective function formulation to efficiently tune the Tx equalizer and optimize the eye diagram to successfully comply with industrial specifications

    Automated Crack Identification for Cement Paste

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    The development of an automated procedure for the identification of microcracks in cementitious materials is described. The degree and nature of microcracking is measured using backscattered electron images obtained with an integrated scanning electron microscope/image analysis system. Multiple images for specimens are analyzed using a computer program developed to identify and measure microcracks within the individual phases of cement paste. The procedure is developed to assist in the determination of the roles played by individual phases in cement paste in the formation and propagation of microcracks. Procedures for specimen testing, preparation, imaging, and crack analysis are described, along with a description of the development of the analysis program. The analysis capabilities of the program are demonstrated. The gray level of epoxy-filled cracks in polished cement paste specimens is affected by the atomic number density of underlying and adjacent phases. As a result, cracks cannot be identified based on gray level alone.Epoxy-filled cracks in polished cement paste specimens can be identified based on local changes in gray level and the application of geometric requirements; and combined procedures that establish the floor of a crack, minimum gradient and gray level adjacent to cracks, and minimum differences in gray level between the floor of a crack and adjacent solid phases provide a reproducible and consistent technique for crack identification in cement paste

    Pengembangan Ekonomi Kreatif Berbasis Potensi Desa Desa Demi Terwujudnya Agrowisata Desa Saribaye Kecamatan Lingsar

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    Desa Saribaye merupakan desa yang terletak pada Kecamatan Lingsar, Kabupaten Lombok Barat, yang dimana desa ini memiliki potensi untuk menjadi sebuah desa yang berbasis agroekowisata yang cukup besar terutama wisata yang memanfaatkan alamnya. Upaya-upaya untuk pengembangan potensi agroekowisata ini diperlukan untuk membantu peningkatan kesejahteraan masyarakatnya, salah satunya adalah dengan meningkatkan perekonomian desa dengan mengembangkan atau menciptakan mata pencaharian ekonomi kreatif, yang memanfaatkan potensi-potensi yang ada pada desa tersebut. Kegiatan pengabdian ini bertujuan untuk membantu Desa Saribaye dalam melakukan pengembangan ekonomi kreatif tersebut, mulai dari pencarian potensi, hingga perancangan, pembuatan hingga pemasaran produk yang telah memiliki nilai ekonomis untuk dijual. Hasil dari pelaksanaan kegiatan ini ditunjukkan dengan terbentuknya berbagai produk yang bernilai ekonomis, yaitu  keripik pisang, lilin aromaterapi, abon ikan nila , serta jamur krispi. Pada kegiatan ini, kelompok sasaran didampingi juga untuk melakukan pemasaran terhadap produk-produk yang telah dihasilkan tersebut melalui platform media sosial, seperti facebook market place dan Instagram

    Statistical Properties of Turbulence: An Overview

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    We present an introductory overview of several challenging problems in the statistical characterisation of turbulence. We provide examples from fluid turbulence in three and two dimensions, from the turbulent advection of passive scalars, turbulence in the one-dimensional Burgers equation, and fluid turbulence in the presence of polymer additives.Comment: 34 pages, 31 figure

    Post-silicon Receiver Equalization Metamodeling by Artificial Neural Networks

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    As microprocessor design scales to the 10 nm technology and beyond, traditional pre- and post-silicon validation techniques are unsuitable to get a full system functional coverage. Physical complexity and extreme technology process variations severely limits the effectiveness and reliability of pre-silicon validation techniques. This scenario imposes the need of sophisticated post-silicon validation approaches to consider complex electromagnetic phenomena and large manufacturing fluctuations observed in actual physical platforms. One of the major challenges in electrical validation of high-speed input/output (HSIO) links in modern computer platforms lies in the physical layer (PHY) tuning process, where equalization techniques are used to cancel undesired effects induced by the channels. Current industrial practices for PHY tuning in HSIO links are very time consuming since they require massive lab measurements. An alternative is to use machine learning techniques to model the PHY, and then perform equalization using the resultant surrogate model. In this paper, a metamodeling approach based on neural networks is proposed to efficiently simulate the effects of a receiver equalizer PHY tuning settings. We use several design of experiments techniques to find a neural model capable of approximating the real system behavior without requiring a large amount of actual measurements. We evaluate the models performance by comparing with measured responses on a real server HSIO link

    Imaging of ependymomas: MRI and CT

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    The imaging features of intracranial and spinal ependymoma are reviewed with an emphasis on conventional magnetic resonance imaging (MRI), perfusion MRI and proton magnetic resonance spectroscopy, and computed tomography. Imaging manifestations of leptomeningeal dissemination of disease are described. Finally, salient imaging features obtained in the postoperative period to evaluate completeness of surgical resection, and thereafter for long-term surveillance for disease recurrence, are reviewed
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