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2023 4th International conference on Advanced Materials and Intelligent Manufacturing, ICAMIM 2023

作者： Yang, Zhengjie Ma, Liping Zhang, Jianyong Dong, Wendi Zhang, Qingmeng Chen, Rumeng School of Mechanical and Materials Engineering North China University of Technology Beijing100144 China Institute of Automation CAS Beijing100190 China Binzhou Institute of Technology Weiqiao-UCAS Science and Technology Park Shandong Province Binzhou256606 China

Micro-lens arrays, due to their unique structure and outstanding optical performance, have been widely applied in advanced domains such as display technology, optical imaging, and laser processing. Among the manufacturing techniques, embossing molding is considered an efficient and precise method for fabricating micro-lens arrays. However, given the intricate structural characteristics of these arrays, precise control over the process becomes paramount. This study introduces a digital twin system for micro-lens array embossing manufacturing, grounded on a process knowledge base. The system relies on the rich process knowledge within the backend database combined with real-time sensor data, providing a powerful drive for the digital twin, thereby ensuring the precision and stability of the embossing manufacturing process. Additionally, the digital twin technology not only offers real-time monitoring and feedback for the production process of the micro-lens arrays but also aids researchers in optimizing process parameters, further enhancing product quality and consistency. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Digital storage

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Blockchain storage Method Based on Erasure Code 8

Blockchain Storage Method Based on Erasure Code

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8th International conference on data Science in Cyberspace, DSC 2023

作者： Meng, Fanyao Li, Jin Gao, Jiaqi Liu, Junjie Ru, Junpeng Lu, Yueming School of Cyberspace Security Beijing University of Posts and Telecommunications Key Lab of Trustworthy Distributed Computing and Service Ministry of Education Beijing China School of Information and Communication Engineering Beijing University of Posts and Telecommunications The State Key Laboratory of Information Photonics and Optical Communications Beijing China

ISBN: (纸本)9798350331035

Blockchain, as an emerging distributed database, effectively addresses the issue of centralized storage in IoT data, where storage capacity cannot match the explosive growth in devices and data scale, as well as the contradictions arising from centralized data management concerning data privacy and security concerns. To alleviate the problem of excessive pressure on single-point storage and ensure data security, a blockchain data storage method based on erasure codes is proposed. This method involves constructing mathematical functions that describe the data to split the original block data into multiple fragments and add redundant slices. These fragments are then encoded and stored in different locations using a circular hash space with the addition of virtual nodes to ensure load balancing among nodes and reduce situations where a single node stores too many encoded data blocks, effectively enhancing the storage space utilization efficiency of the distributed storage database. The blockchain storage method stores encoded data digest information such as storage location, creation time, and hashes, allowing for the tracing of the origin of encoded data blocks. In case of accidental loss or malicious tampering, this enables effective recovery and ensures the integrity and availability of data in the network. Experimental results indicate that compared to traditional blockchain approaches, this method effectively reduces the storage pressure on nodes and exhibits a certain degree of disaster recovery capability. © 2023 IEEE.

关键词： Blockchain Consistent Hashing Erasure Codes Internet of Things

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ORTOA: A Family of One Round Trip Protocols For Operation-Type Obliviousness 27

ORTOA: A Family of One Round Trip Protocols For Operation-Ty...

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27th International conference on Extending database technology, EDBT 2024

作者： Maiyya, Sujaya Steinhart, Yuval Davila, Adrian Du, Jason Agrawal, Divyakant Ananth, Prabhanjan El Abbadi, Amr University of Waterloo Canada UC Santa Barbara United States

ISBN: (纸本)9783893180950

Many applications relying on cloud storage services typically encrypt their data to ensure data privacy. However, serving client requests by reading or writing the encrypted data reveals the type of client operation to a potentially untrusted cloud. An adversary can exploit this information leak to compromise a user’s privacy by tracking read/write access patterns. Existing approaches such as Oblivious RAM (ORAM) schemes hide the type of client access by always reading and then writing the data sequentially for both reads and writes, rendering one of these rounds redundant with respect to a client request. To mitigate this redundancy, we propose ORTOA- a family of protocols enabling single-round data access on remote storage without revealing the operation type. Specifically, we propose three protocols, two using existing cryptographic primitives of fully homomorphic encryption and trusted execution environments (TEEs), and a new primitive inspired by garbled circuits. Each of these protocols has different trust assumptions, allowing an application to choose the option best suited for its needs. To our knowledge, ORTOA is the first to propose generalized protocols to obfuscate the type of access in a single round, reducing communication overhead by half. The proposed techniques can pave the way for novel ORAM schemes that hide both the type of access and the access pattern in a single round. Our experimental results show ORTOA achieving throughput gains of 1.7x-3.2x compared to a baseline requiring two rounds for access type hiding, with the baseline incurring latency 1.5-1.9x that of ORTOA for 160B-sized objects. © 2024 Copyright held by the owner/author(s).

关键词： Random access storage

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Blockchain based Privacy Preserving Student’s Certificate storage, Distribution and Verification 14

Blockchain based Privacy Preserving Student’s Certificate S...

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14th International conference on advances in Computing, Control, and Telecommunication Technologies, ACT 2023

作者： Shaji, Athulya C. Anitha, V.S. Govt. Engineering College Wayanad India

The blockchain is a chain of blocks with each block header containing a hash of its preceding block. Blockchain technology transforms the existing centralized system, trusting the third party, into a decentralized system that can exchange or store information within a trustless environment while preserving privacy and security. The transactions and data stored in the blockchain are not pursuant to the control of any mediator. The technology is now widely used in medical records, education, supply chain, and IoT. The paper implements a prototype model of a decentralized application for an education record verification and sharing system. In the current education system, institutions manage their data on a centralized server. Students are handed over a certificate as a hard copy at the end of the course. In this scenario, corroborating the authentication of a hard copy is very difficult because counterfeiting the original certificate is effortless. In this paper, we introduce a blockchain-based proposal to substantiate the authenticity of transcripts and share them. Blockchain-based applications can hasten the transcript corroboration and sharing process by transforming the centralized approach into a decentralized one. The users of the blockchain- based system get lifelong authorized access to their transcripts and can share them with other institutes or organizations. We use IPFS blockchain-based decentralized cloud for storage, it can minimize the cost up to 86% and proxy re-encryption provide secure exchange without compromising the complexity. © Grenze Scientific Society, 2023.

关键词： Blockchain

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System design of ultrasonic oil production flowmeter based on time difference method

System design of ultrasonic oil production flowmeter based o...

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2022 International conference on optical technology, Semiconductor Materials, and Devices, OTSMD 2022

作者： Wang, Wenzhen Kai, Yan Xi'an Shiyou University Xi'an China

ISBN: (纸本)9781510663015

The flowmeter uses the TDC-GP22 chip as the acoustic wave processing core, uses the TDC-GP22 module to generate pulse waves, and sends them to the corresponding ultrasonic signal drive circuit to improve the amplitude of the ultrasonic signal. The echo is sent to TDC-GP22 to calculate the forward and reverse time difference;the main control module selects the STM32F407 chip, controls the TDC-GP22 module to transmit forward and reverse ultrasonic signals, enters the signal drive circuit to receive the echo signal and loads it into the TDC -GP22 chip calculates the time difference, and finally sends the corresponding time difference data to the main control module, which is connected to the PC through the serial port to display the measured data;the test is carried out in the fluid circulation device in the laboratory, and the speed of the screw pump is controlled to adjust the pipeline. The mass flowmeter is used as the calibration instrument, and the final test results demonstrate that the measurement accuracy of the ultrasonic flowmeter meets the requirements of oilfield use. © 2023 SPIE.

关键词： Digital storage

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advances in organic materials for chiral luminescence-based OLEDs

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TRENDS IN CHEMISTRY 2023年第10期5卷 734-747页

作者： Wu, Xiugang Yan, Xiuqin Chen, Yi Zhu, Weiguo Chou, Pi-Tai Changzhou Univ Sch Mat Sci & Engn Jiangsu Engn Lab Light Elect Heat Energy Convertin Changzhou 213164 Peoples R China Natl Taiwan Univ Dept Chem Taipei Taiwan

Emitters incorporating circularly polarized luminescence (CPL)-based organic light-emitting diodes (CP-OLEDs) are highly desirable in the pursuit of new optoelectronic applications such as 3D displays and optical data storage. In particular, emitters possessing circularly polarized thermally activated delayed fluorescence (CP-TADF) are able to achieve high efficiency in OLEDs. By further endowing multi-resonance thermally activated delayed fluorescence (MR-TADF, a subclass of TADF) with circularly polarized properties, MR-CP-OLEDs can obtain narrow emission bandwidths and may help to realize the holy grail of ultra-small bandwidth. Accordingly, this review covers the recent progress and evolution of CP-TADF emitters, their upgraded features and corresponding device technologies, as well as the challenges encountered in practical CP-OLEDs.

关键词： organic light-emitting diodes (OLEDs) circularly polarized OLEDs (CP-OLEDs) circularly polarized-thermally activated delayed fluorescence (CP-TADF) dissymmetry factors (g)

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Enhancing Healthcare Delivery in India: Emergency Medical Care and Patient History Management

Enhancing Healthcare Delivery in India: Emergency Medical Ca...

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2023 International conference on advances in Computation, Communication and Information technology, ICAICCIT 2023

作者： Kambare, Shweta M. Kolpe, Phalesh D. Patil, Sanket D. Pote, Abhishek M. Patil, Siddhesh S. Kokate, Prerna D. Vit Department of Information Technology Pune India Vit Department of Artificial Intelligence and Data Science Pune India

ISBN: (纸本)9798350344387

In India, the current healthcare system faces significant inefficiencies, resulting in poor healthcare delivery and patient outcomes. This system lacks comprehensive records of patients' medical histories, leading to critical delays in emergency situations, such as road accidents. The urgency to enhance the healthcare system has heightened in the post-COVID era. This research proposes an innovative solution to address these challenges - an Android-based healthcare application. This application aims to bridge the gap in emergency response and the lack of medical history knowledge among healthcare professionals. Key features include 'Ride Mode,' which assists in detecting accidents and identifying accident victims, and seamless access to patients' medical histories. The application, developed using Android Studio, leverages Firebase for secure data storage. By providing immediate access to critical medical information, it empowers healthcare providers to make informed decisions swiftly, ultimately improving healthcare delivery and patient safety. © 2023 IEEE.

关键词： Android Firebase Healthcare Java Medical

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Design of comprehensive operation and maintenance system for security command vehicles 5

Design of comprehensive operation and maintenance system for...

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5th International conference on Computer Communication and Network Security, CCNS 2024

作者： Shi, Xin Ma, Wentao Fu, Zhengkang Ding, Wei Wang, Qiang Nanjing Research Institute of Electronics Engineering Nanjing210004 China

ISBN: (纸本)9781510681842

Security command vehicles are used for emergency response command in counter-terrorism, emergency response, post disaster rescue, and other emergency situations. There are many types of installed equipment, obvious differences, difficulties in integrated control, and a lack of a unified operation and maintenance data management platform. To address these issues, this paper proposes a comprehensive operation and maintenance system for security command vehicles based on embedded Linux. The system is based on vehicle comprehensive operation and maintenance equipment(VOME), combined with multi-source heterogeneous data fusion, Internet of Things, and Web technology, to achieve data collection, centralized control, data storage, and operation and maintenance management functions. At the same time, the application was carried out on a certain security command vehicle, and the effectiveness of the proposed system was verified through network signal testing, CAN interface testing, and system testing. This has important engineering practical significance for improving the operation and maintenance management capabilities and emergency command capabilities of security command vehicles. © 2024 SPIE.

关键词： data fusion

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A novel high-dimensional clustering algorithm and its application in financial data forecasting 3

A novel high-dimensional clustering algorithm and its applic...

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3rd International conference on Electronic Information Engineering, Big data, and Computer technology, EIBDCT 2024

作者： Qian, Yanshan Du, Zhuohao Li, Chuanan Qiu, Junda School of Computer Engineering Jiangsu University of Technology Changzhou213001 China

ISBN: (纸本)9781510680449

The purpose of this paper is to study the nonlinear characteristics of stock market price rise and fall, and optimize the characteristics of high-dimensional data for the challenges brought by the sparsity and complexity of high-dimensional data to the traditional clustering algorithms. Explore the impact of the multidimensional characteristics and sparsity of stock data on clustering analysis, and propose a high-dimensional clustering algorithm based on Pareto-optimal Steiner points. Traditional clustering algorithms are deficient in dealing with nonlinear data and spatial clustering, while randomly selected clustering centers are easily interfered by market noise, which affects the accuracy of clustering results. In this paper, more accurate clustering results are achieved by selecting Steiner points with Pareto optimality as clustering centers. And the algorithm is applied to the analysis of the stock market, which can effectively help investors choose the appropriate investment portfolio and has important practical application value. Meanwhile, the distance matrix is constructed as the basis of clustering analysis through the preprocessing of stock data and distance metric. The innovation of this paper is that the Steiner points can better represent the center of the clusters thus effectively reducing the computational complexity and storage overhead and improving the efficiency of the algorithm. And the principle of Pareto optimality is applied to the high-dimensional clustering algorithm, which improves the accuracy of stock market analysis. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Clustering algorithms

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An all-optical 8-bit RAM storage unit with 2x4-bit WDM-formatted data words 22

An all-optical 8-bit RAM storage unit with 2x4-bit WDM-forma...

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conference on optical Interconnects XXII at SPIE OPTO conference

作者： Pappas, Christos Moschos, Theodoros Alexoudi, Theonitsa Vagionas, Christos Pleros, Nikos Aristotle Univ Thessaloniki Dept Informat Thessaloniki Greece Aristotle Univ Thessaloniki Ctr Interdisciplinary Res & Innovat Thessaloniki Greece

ISBN: (纸本)9781510648869;9781510648852

During the past years, the processor-memory performance gap, also known as "Memory Wall" problem, has forced designers to allocate more than 50% of the chip real-estate for caching purposes to alleviate limited memory bandwidth. optical technology holds the credentials of delivering high-bandwidth and energy-efficient photonic integrated memories that could revisit the traditional computing architectures. The migration, however, to fully functional and practical optical RAMs will require the exploitation of wavelength dimension as well as seamless cooperation between storage and peripheral decoding units, for efficient RAM architectural layouts. In this paper we present the first demonstration of an all-optical 8-bit RAM storage unit comprising WDM-enabled 2x4 Row and 1x4 Column Decoders and a 2x4-bit optical RAM Bank for storing a 20Gb/s 4-bit WDM-formatted optical data word per row. The proposed scheme incorporates a shared multi-lambda SOA-MZI Access Gate (AG) per Word Line (WL) for granting access-control to the appropriate word line, WL "00" or WL "01", and a passive Column Decoder that directs the incoming WDM-formatted data words to the respective RAM cells. Each RAM cell is in turn based on an elementary monolithically integrated InP photonic Flip-Flop (FF). The proposed architecture is experimentally verified for successful Write operation of a 4-bit WDM word to a selected 4-bit RAM row at 20Gb/s RAM throughput and a peak power penalty within the range of [7.8-10.7] dB, promising a 4x speed-up in memory-access throughput and paving the way for high-bandwidth multi-bit optical RAM-architectures that may relax the memory-bottleneck of computing architectures.

关键词： optical RAM optical memory optical storage unit peripheral circuitry WDM-formatted words

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