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作者： Elidrissi, Moulay Rachid Chan, Kheong Sann Teo, Kim Keng Eason, Kwaku Hwang, Euiseok Vijaya Kumar, B.V.K. Qin, Zhiliang Data Storage Institute (DSI) Agency for Science Technology and Research (ASTAR) 117608 Singapore Singapore Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213-3890 United States

Two-dimensional magnetic recording (TDMR) together with shingled magnetic recording (SMR) are technologies proposed to extend the life of conventional granular magnetic recording. The grain flipping probability (GFP) model has been proposed to mimic the performance of micromagnetic (μ-mag) simulations for the purpose of signal reproduction. Other work in TDMR includes the proposal of a Gaussian mixture model (GMM) that produces improved likelihood information at the output of the detector, combined with low density parity check (LDPC) codes. The contribution of this paper is threefold. First, we aim to simulate a TDMR/SMR recording system with the GFP model, both with and without the GMM detector, and with various random and structured LDPC codes, of both 4 k and 16 k block lengths, to determine areal densities that might be achieved. Second, we perform a comparison of the various model order reduced (MOR) GFP implementations to compare the effect of writing with various factors taken out of the picture. Third, we perform a validation of the GFP model and the setup as a whole, by running the system with a parameter set close to that of conventional recording. The results of these experiments give an assurance of the validity of our model, give an indication of the expected density that might be achieved in a TDMR/SMR system, and give a direction for which parameter(s) in magnetic recording systems might be optimized to yield the most gain. © 2011 IEEE.

关键词： Magnetic recording

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Advances in Parallel & Distributed processing, and Applications 1

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丛书名： Transactions on Computational science and Computational Intelligence

1000年

作者： Hamid R. Arabnia Leonidas Deligiannidis Michael R. Grimaila Douglas D. Hodson Kazuki Joe Masakazu Sekijima Fernando G. Tinetti

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Effect of in situ FIB trimming on the spin configurations of hexagonal-shaped elements characterized by SEMPA imaging

Effect of in situ FIB trimming on the spin configurations of...

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作者： Lua, Sunny Yan Hwee Kushvaha, Sunil Singh Wu, Yihong H. Teo, Kie Leong Chong, Tow Chong NUS Graduate School for Integrative Sciences and Engineering National University of Singapore Singapore 117456 Singapore Information Storage Materials Laboratory Department of Electrical and Computer Engineering National University of Singapore Singapore 117576 Singapore Data Storage Institute Agency for Science Technology and Research A-STAR Singapore 117608 Singapore

We report on the effect of in situ focused ion beam (FIB) trimming on the spin configurations of the hexagonal-shaped elements, characterized by scanning electron microscopy with polarization analysis (SEMPA) imaging. The use of SEMPA and successive in situ FIB trimming makes it possible to study the effect of thickness on the spin configuration of a same hexagonal dot array, eliminating the effect of irregularity in edges caused by the fabrication processes. The results obtained indicate that there exists a transition of a single vortex state to a stable double vortex state when the thickness is reduced to below 8 nm. Micromagnetic modeling has been performed to investigate the effect of reductions in both the thickness and saturation magnetization due to FIB trimming. © 2008 IEEE.

关键词： Scanning electron microscopy

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data engineering for Smart Systems 1

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丛书名： Lecture Notes in Networks and Systems

1000年

作者： Priyadarsi Nanda Vivek Kumar Verma Sumit Srivastava Rohit Kumar Gupta Arka Prokash Mazumdar

ISBN: (数字)9789811626418

ISBN: (纸本)9789811626401

This book features original papers from the 3rd International Conference on Smart IoT Systems: Innovations and Computing (SSIC 2021), organized by Manipal University, Jaipur, India, during January 22–23, 2021. It discusses scientific works related to data engineering in the context of computational collective intelligence consisted of interaction between smart devices for smart environments and interactions. Thanks to the high-quality content and the broad range of topics covered, the book appeals to researchers pursuing advanced studies.

关键词： data engineering Systems and data Security data Structures and Information Theory Artificial Intelligence Big data

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Digital Twin for Digital Health: Body Joint Modeling and 3D Pose Reconstruction

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ACM Transactions on Computing for Healthcare 1000年

作者： Huan Chen Xiaoye Qian Yi Cai Tianyu Lu Xiaowei Xu Feng Lin Shih-Ching Yeh Ming-Chun Huang Department of Electrical Computer and Systems Engineering Case Western Reserve University USA Department of Computer Science Northeastern University USA Department of Cardiovascular Surgery Guangdong Cardiovascular Institute Guangdong Provincial People's Hospital (Guangdong Academy of Medical Sciences) and Southern Medical University China School of Cyber Science and Technology ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University China Department of Photonic System National Yang Ming Chiao Tung University and Department of Computer Science and Information Engineering National Central University Taiwan Department of Data and Computational Science Duke Kunshan University China

Body joint modeling and human pose reconstruction provide precise motion and quantitative geometric information about human dynamics. The rich motion information obtained from human pose estimation plays important roles in a wide range of digital twin and connected health applications. However, current related researches have difficulties in extracting the joints’ spatial-temporal correlations from different levels. This is due to the poses being at various complexities in moving various joints differently. Hence, the typical conventional transformer method is non-adaptable and barely meets the aforementioned requirement. In this paper, we propose the Body Joint Interactive transFormers (BJIFormer) to extract the multi-level joints’ spatial-temporal information. The design enables the model to learn the inner joints’ correlation inside the body parts across frames and propagate the extracted information across the body parts with shared joints. The multi-level body joint interactive scheme has greater efficiency improvement by restricting the self-attention computation to partial body parts and connecting each body part by torso. The proposed interactive approach explores the spatial-temporal correlation following the hierarchical paradigm and effectively estimates and reconstructs 3D human poses.

关键词： Digital Twin Digital Health Body Joint Modeling Pose Reconstruction

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A self-consistent SDD-NEGF approach for modelling magnetic tunnel junctions

A self-consistent SDD-NEGF approach for modelling magnetic t...

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作者： Siu, Z.B. Jalil, M.B.A. Tan, S.G. Wang, J.-S. Department of Physics Center for Computational Science and Engineering National University of Singapore 117542 Singapore Singapore Data Storage Institute Agency for Science Technology and Research (A STAR) 117608 Singapore Singapore Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Computational Nanoelectronics and Nano-device Laboratory Electrical and Computer Engineering Department National University of Singapore 117576 Singapore Singapore Institute of High Performance Computing Agency for Science Technology and Research (A STAR) 138632 Singapore Singapore

Most contemporary work on magnetic tunnel junctions either consider ballistic quantum transport across the tunneling barrer, for instance via the Non Equilibrium Green's Function (NEGF) formalism, or treat the tunneling region as a lump resistance connected to bulk metallic leads in the Spin Drift-Diffusion (SDD) approach. The effects of interfacial barriers and central device physics on the spin accumlation in the leads have largely been ignored in most NEGF calculations. In this work we introduce a self consistent approach that combines the NEGF and SDD methods. We calculate the effects of the barrier potential height and spin orbit interaction on the spin injection from a ferromagnet to a semiconductor through the barrier. © 2006 IEEE.

关键词： Tunnel junctions

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Achieving highly localized effective magnetic fields with non-uniform rashba spin-orbit coupling for tunable spin current in metal/semiconductor/metal structures

Achieving highly localized effective magnetic fields with no...

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作者： Fujita, Takashi Jalil, Mansoor B. A. Tan, Seng Ghee Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Data Storage Institute A STAR (Agency for Science Technology and Research) Singapore 117608 Singapore Computational Nanoelectronics and Nano-Device Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore

We theoretically study the spin-dependent transport of conduction electrons across typical metal/semiconductor (SC)/metal structures, where the SC channel exhibits Rashba spin-orbit coupling (SOC) and the metal contacts do not. The spatial discontinuity of the Rashba SOC is shown to result in highly localized, effective magnetic field barriers at the device interfaces. As a result, electrons with oppositely polarized spins along the injection direction are found to be transmitted with different probabilities, resulting in a finite spin polarization. The value of the spin polarization depends sensitively on the Rashba SOC strength within the SC channel, which is well known to be adjustable by an applied gate bias. Thus the proposed structure could be useful as a tunable source of spin-polarized current in spintronic applications. © 2006 IEEE.

关键词： Spin orbit coupling

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Theoretical Foundations of computer Vision 1

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丛书名： Computing Supplementa

1000年

作者： W. Kropatsch R. Klette F. Solina R. Albrecht

ISBN: (数字)9783709165867

ISBN: (纸本)9783211827307

computer Vision is a rapidly growing field of research investigating computational and algorithmic issues associated with image acquisition, processing, and understanding. It serves tasks like manipulation, recognition, mobility, and communication in diverse application areas such as manufacturing, robotics, medicine, security and virtual reality. This volume contains a selection of papers devoted to theoretical foundations of computer vision covering a broad range of fields, e.g. motion analysis, discrete geometry, computational aspects of vision processes, models, morphology, invariance, image compression, 3D reconstruction of shape. Several issues have been identified to be of essential interest to the community: non-linear operators; the transition between continuous to discrete representations; a new calculus of non-orthogonal partially dependent systems.

关键词： Image processing and computer Vision Pattern Recognition Artificial Intelligence Combinatorics Differential Geometry Statistics, general

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Gold bow-tie shaped aperture nanoantenna: Wide band near-field resonance and far-field radiation

Gold bow-tie shaped aperture nanoantenna: Wide band near-fie...

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作者： Wu, Yu-Ming Li, Le-Wei Liu, Bo Department of Electrical and Computer Engineering National University of Singapore Kent Ridge Singapore 117576 Singapore Institute of Electromagnetics University of Electronic Science and Technology of China Chengdu 611731 China Data Storage Institute Agency for Science Technology and Research Kent Ridge Singapore 117608 Singapore

In this paper, the optical bow-tie shaped aperture nanoantenna excited by a plane wave is numerically investigated based on the finite integration technique (FIT) where both near-field resonant properties, and far-field radiation characteristics are studied. Different from conventional metallic antennas used in the radio frequency range, gold aperture nanoantenna with a dimension of tens of nanometers is capable of producing a localized enhanced field. The enhanced filed is equivalent to a strong light spot which can lead to the resolution improvement of the microscopy and optical lithography, thus increasing the optical data storage capacity. Compared with previous studies, the present work improves calculations in terms of broader bands specially in optical range, where the nanoantenna's surface plasmon resonance is appositely described in terms of properly chosen frequency dependent permittivity. It is found from our observation that in the near-field, the bow-tie shaped aperture nanoantenna possesses strong resonant properties. These properties, dependent on the polarization directions of the excitation source and the geometrical parameters of nanoantenna, are studied in detail. In addition, the far-field characteristics of the nanoantenna such as directivity and gain are studied for the first time via computed aperture nanoantenna's pattern. The promising results of this study may have useful potential applications in near-field sample detection, optical microscopy, etc. © 2006 IEEE.

关键词： Optical data storage

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Efficient spin injection and spin filtering in semiconductors by utilizing the k3-Dresselhaus spin-orbit effect

Efficient spin injection and spin filtering in semiconductor...

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作者： Fujita, T. Jalil, M.B.A. Tan, S.G. Information Storage Materials Laboratory Electrical and Computer Engineering Department National University of Singapore Singapore 117576 Singapore Data Storage Institute A-STAR (Agency for Science Technology and Research) Singapore 117608 Singapore

We numerically study the spin-dependent transmission characteristic of conduction electrons across a semiconductor-based trilayer structure with k 3-Dresselhaus spin-orbit coupling, where the Fermi level of electrons exceeds the electrostatic barrier height. Unlike previous studies which focus on the tunneling regime, the electron transmission across our structure is high, thereby ensuring that the polarization can be utilized in a practical device. The polarization is studied for two barrier materials, GaSb and InSb, which both show a considerable polarization amplitude attainable within realistic modeling values. We finally propose two interesting spintronic device concepts based on our structure and its unique polarization characteristics; a sensitive, gate-tunable spin filter and a novel spin transistor device. © 2008 IEEE.

关键词： Spin orbit coupling

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