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Novel Adder Circuits Based On Quantum-Dot Cellular Automata (QCA)

Circuits and Systems 2014年第6期5卷 142-152页

作者： Firdous Ahmad ghulam mohiuddin bhat Peer Zahoor Ahmad Department of Computer Science University of Kashmir (J&K) India Department of Electronics & IT University of Kashmir (J&K) India

Quantum-dot cellular automaton (QCA) is a novel nanotechnology that provides a very different computation platform than traditional CMOS, in which polarization of electrons indicates the digital information. This paper demonstrates designing combinational circuits based on quantum-dot cellular automata (QCA) nanotechnology, which offers a way to implement logic and all interconnections with only one homogeneous layer of cells. In this paper, the authors have proposed a novel design of XOR gate. This model proves designing capabilities of combinational circuits that are compatible with QCA gates within nano-scale. Novel adder circuits such as half adders, full adders, which avoid the fore, mentioned noise paths, crossovers by careful clocking organization, have been proposed. Experiment results show that the performance of proposed designs is more efficient than conventional designs. The modular layouts are verified with the freely available QCA Designer tool.

关键词： Novel Adder Circuits Based on Quantum-Dot Cellular Automata (QCA)

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Distributed Timestamp Mechanism Based on Verifiable Delay Functions

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Computer Systems Science & Engineering 2023年第2期44卷 1633-1646页

作者： Qiang Wu Zhaoyang Han ghulam mohiuddin Yongjun Ren Engineering Research Center of Digital Forensics of Ministry of Education School of Computer ScienceNanjing University of Information Science and TechnologyNanjing210044China Nanjing University of Aeronautics and Astronautics Nanjing210008China Department of Cyber Security at VaporVM Abu Dhabi999041United Arab Emirates

In the data communication system,the real-time information interaction of communication device increases the risk of privacy sensitive data being tam-pered ***,maintaining data security is one of the most important issues in network data *** the timestamp is the most impor-tant way to authenticate data in information interaction,it is very necessary to pro-vide timestamp service in the data communication ***,the existing centralized timestamp mechanism is difﬁcult to provide credible timestamp ser-vice,and users can conspire with timestamping servers to forge ***,this paper designs a distributed timestamp mechanism based on contin-uous veriﬁable delay *** utilizes multiple independent timestamp servers to provide timestamp services in a distributed model and appends the timestamp to the data once the data is ***,it can prove that the data already exists at a certain time and ensure the accuracy of the ***,a digital blind signature based on elliptic curve cryptography is utilized to solve the problem of timestamp forgery in timestamp ***,the security ana-lysis of the scheme ensures the data security of data communication system and the concurrency rate of *** experimental results also show that the scheme greatly improves the efﬁciency of digital signatures.

关键词： Timestamp veriﬁable delay functions blockchain

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Privacy Data Management Mechanism Based on Blockchain and Federated Learning

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Computers, Materials & Continua 2023年第1期74卷 37-53页

作者： Mingsen Mo Shan Ji Xiaowan Wang ghulam mohiuddin Yongjun Ren Engineering Research Center of Digital Forensics of Ministry of Education School of ComputerNanjing University of Information Science&TechnologyNanjing210044China Zhengde Polytechnic Nanjing211106China Xi’an University of Posts&Telecommunications Xi’an710061China Department of Cyber Security at VaporVM Abu Dhabi999041United Arab Emirates

Due to the extensive use of various intelligent terminals and the popularity of network social tools,a large amount of data in the field of medical *** to manage these massive data safely and reliably has become an important challenge for the medical network *** paper proposes a data management framework of medical network community based on Consortium Blockchain(CB)and Federated learning(FL),which realizes the data security sharing between medical institutions and research *** this framework,the data security sharing mechanism of medical network community based on smart contract and the data privacy protection mechanism based on FL and alliance chain are designed to ensure the security of data and the privacy of important data in medical network community,*** intelligent contract system based on Keyed-Homomorphic Public Key(KH-PKE)Encryption scheme is designed,so that medical data can be saved in the CB in the form of ciphertext,and the automatic sharing of data is *** knowledge mechanism is used to ensure the correctness of shared ***,the zero-knowledge mechanism introduces the dynamic group signature mechanism of chosen ciphertext attack(CCA)anonymity,which makes the scheme more efficient in computing and communication *** the end of this paper,the performance of the scheme is analyzed fromboth asymptotic and practical *** experimental comparative analysis,the scheme proposed in this paper is more effective and feasible.

关键词： Data management blockchain federated learning

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Risk factors and outcomes of peptic ulcer bleed in a Pakistani population:A single-center observational study

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World Journal of Gastrointestinal Pharmacology and Therapeutics 2024年第3期15卷 1-9页

作者： Nazish Butt Muhammad Tayyab Usmani Nimrah Mehak Saba Mughal Fakhar Ali Qazi-Arisar ghulam mohiuddin Gulzar Khan Department of Gastroenterology Jinnah Postgraduate Medical CentreKarachi 75505SindhPakistan National Institute of Liver&GI Diseases Dow University of Health SciencesKarachi 75330SindhPakistan School of Public Health Dow University of Health SciencesKarachi 75330SindhPakistan

BACKGROUND Peptic ulcer disease(PUD)remains a significant healthcare burden,contributing to morbidity and mortality *** advancements in therapies,its prevalence persists,particularly in regions with widespread nonsteroidal antiinflammatory drugs(NSAIDs)use and Helicobacter pylori *** To comprehensively analyse the risk factors and outcomes of PUD-related upper gastrointestinal(GI)bleeding in Pakistani *** This retrospective cohort study included 142 patients with peptic ulcer bleeding who underwent upper GI endoscopy from January to December *** on demographics,symptoms,length of stay,mortality,re-bleed,and Forrest classification was *** The mean age of patients was 53 years,and the majority was men(68.3%).Hematemesis(82.4%)and epigastric pain(75.4%)were the most common presenting *** patients(73.2%)were discharged within five *** mortality rates at one week and one month were 10.6%and 14.8%,***-bleed within 24 h and seven days occurred in 14.1%and 18.3%of patients,*** ulcers were Forrest class(FC)Ⅲ(72.5%).Antiplatelet use was associated with higher mortality at 7 and 30 d,while alternative medications were linked to higher 24-hour re-bleed *** use was associated with more FCⅢ***-bleed at 24 h and 7 d was strongly associated with one-week or one-month *** Antiplatelet use and rebleeding increase the risk of early mortality in PUD-related upper GI bleeding,while alternative medicines are associated with early rebleeding.

关键词： Non variceal bleed Mortality Re-bleed Forrest classification Antiplatelets Alternative medicines

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