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Design of a(480,240)CMOS Analog Low-Density Parity-Check Decoder

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China Communications 2017年第8期14卷 41-53页

作者： hao zheng Zhe Zhao Xiangming Li Hangcheng Han School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China

Digital low-density parity-check(LDPC) decoders can hardly meet the power-limits brought by the new application scenarios. The analog LDPC decoder, which is an application of the analog computation technology, is considered to have the potential to address this issue to some extent. However, due to the lack of automation tools and analog stopping criteria, the analog LDPC decoders suffer from costly handcraft design and additional decoding delay, and are not feasible to practical applications. To address these issues, a decoder architecture using reusable building blocks is designed to lower the handcraft design, and a probability stopping criterion that is specially designed for analog decoder is further planned and implemented to reduce the decoding delay. Then, a(480,240) CMOS analog LDPC decoder is designed and fabricated in a 0.35-μm CMOS technology. Experimental results show that the decoder prototype can achieve 50 Mbps throughput when the power consumption is about 86.3m W, and the decoding delay can be reduced by at most 93% compared with using the preset maximum decoding delay in existing works.

关键词： LDPC analog decoder handcraft design reduction probability stopping criterion for analog decoding reusable building block

Area-efficient analog decoder design for low density parity check codes in deep-space applications

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The Journal of China Universities of Posts and Telecommunications 2017年第4期24卷 69-75页

作者： Zhao Zhe Gao Fei zheng hao Yin Xue School of Information and Electronics Beijing Institute of Technology Beijing 100081 China

Area-efficient design methodology is proposed for the analog decoding implementations of the rate-l/2 accumulate repeat-4 jagged-accumulate （AR4JA） low density parity check （LDPC） code. The proposed approach is designed using optimized decoding architecture and regularized routing network, in such a way that the overall wiring overhead is minimized and the silicon area utilization is significantly improved. The prototyping chip used to verily the approach is tully integrated in a four-metal double-poly 0.35 lam complementary metal oxide semiconductor （CMOS） technology, and includes an input-output interface that maximizes the decoder throughput. The decoding core area is 2.02 mm2 with a post-layout area utilization of 80%. The decoder was successfully tested at the maximum data rate of 10 Mbit/s, with a core power consumption of 6.78 mW at 3.3 V, which corresponds to an energy per decoded bit of 0.677 nJ. The proposed analog LDPC decoder with low processing power and high-reliability is suitable lbr space- and power-constrained spacecraft system.

关键词： low density parity check (LDPC) code analog decoding iterative message-passing algorithms hardware efficient area utilization

Fermi level tuning in Sn_(1-x)Pb_(x)Te/Pb heterostructure via changing interface roughness

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Science China(Physics,Mechanics & Astronomy) 2024年第8期67卷 118-125页

作者： Tengteng Liu Zhaoxia Yi Bangjin Xie Weiyan zheng Dandan Guan Shiyong Wang hao zheng Canhua Liu hao Yang Yaoyi Li Jinfeng Jia Key Laboratory of Artificial Structures and Quantum Control(Ministry of Education) Tsung-Dao Lee InstituteSchool of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Shanghai Research Center for Quantum Sciences Shanghai 201315China Hefei National Laboratory Hefei 230088China

Superconducting SnTe-type topological crystalline insulators(TCIs)are predicted to host multiple Majorana zero modes(MZMs)which can coexist in a single *** level(FL)close to the Dirac points of topological surface states is helpful for detecting ***,the TCI SnTe is a heavily p-type semiconductor which is very difficult to modify to n-type via doping or *** this work,we fabricate the atomically flat Sn_(1-x)Pb_(x)Te/Pb heterostructure by molecular beam epitaxy,and make the p-type Sn_(1-x)Pb_(x)Te become n-type through changing the interface *** scanning tunnelling microscope,we find the Dirac points of Sn_(1-x)Pb_(x)Te/Pb heterostructure are always above the FL due to the Fermi level pinning(FLP)induced by topological surface states at atomically flat *** increasing the interface roughness,the FLP effect is suppressed and then the Dirac points of p-type Sn_(1-x)Pb_(x)Te can be tuned very close to or even below the *** work provides a new method for tuning the FL of SnTe-type TCI which has potential application in novel topological superconductor device.

关键词： topological crystalline insulator superconductor heterostructure Fermi level pinning interface roughness

Assessment of Building Physical Vulnerability in Earthquake‑Debris Flow Disaster Chain

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International Journal of Disaster Risk Science 2023年第4期14卷 666-679页

作者： hao zheng Zhifei Deng Lanlan Guo Jifu Liu Lianyou Liu Tiewei Li Huan zheng Tao zheng Key Laboratory of Environmental Change and Natural Disaster of Ministry of Education Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Academy of Disaster Reduction and Emergency Management Faculty of Geographical ScienceBeijing Normal UniversityBeijing 100875China Department of Fire Commanding China Fire and Rescue InstituteBeijing 102202China China Railway First Group Construction and Installation Engineering Co. Ltd.Xi’an 710054China

Large earthquakes not only directly damage buildings but also trigger debris fows,which cause secondary damage to buildings,forming a more destructive earthquake-debris fow disaster chain.A quantitative assessment of building vulnerability is essential for damage assessment after a disaster and for pre-disaster *** mechanical analysis based on pushover,a physical vulnerability assessment model of buildings in the earthquake-debris fow disaster chain is proposed to assess the vulnerability of buildings in Beichuan County,*** on the specifc sequence of events in the earthquake-debris fow disaster chain,the seismic vulnerability of buildings is 79%,the fow impact and burial vulnerabilities of damaged buildings to debris fow are 92%and 28%respectively,and the holistic vulnerability of buildings under the disaster chain is 57%.By comparing diferent vulnerability assessment methods,we observed that the physical vulnerability of buildings under the disaster chain process is not equal to the statistical summation of the vulnerabilities to independent hazards,which implies that the structural properties and vulnerability of buildings have changed during the disaster chain *** results provide an integrated explanation of building vulnerability,which is essential for understanding building vulnerability in earthquake-debris fow disaster chain and building vulnerability under other disaster chains.

关键词： Building physical vulnerability Debris fow Disaster chain Earthquake

Disseminated strongyloidiasis in a patient with rheumatoid arthritis:A case report

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World Journal of Clinical Cases 2022年第18期10卷 6163-6167页

作者： Jin-hao zheng Lu-Yu Xue Department of Critical Care Medicine Huashan Hospital Affiliated to Fudan UniversityShanghai 200040China

BACKGROUND Strongyloidiasis is usually a chronic infection but it can develop into a fatal disease in immunosuppressed *** SUMMARY A 68-year-old male with rheumatoid arthritis was treated with a variety of immunosuppressants for the past 3 ***,the patient presented with a partial small-bowel obstruction,petechia,coughing and peripheral *** diagnosis was difficult to clarify in other *** hospital found Strongyloides stercoralis larvae with active movement in the routine stool and sputum *** diagnosis of disseminated strongyloidiasis was *** combined with albendazole was used for *** patient responded to therapy and was *** This case underscores the importance of comprehensive differential diagnosis in immunocompromised patients.

关键词： Strongyloidiasis Rheumatoid arthritis Immunosuppressants Small-bowel obstruction Ivermectin Albendazole Case report

Identifying drivers of urban landuse changes in the Wenchuan earthquake- affected area by using night-time light data

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Journal of Mountain Science 2024年第4期21卷 1140-1159页

作者： HUANG Tao DING Mingtao GENG Dongxian GAO Zemin zheng hao School of Civil Engineering and Architecture Southwest University of Science and TechnologyMianyang 621010China Faculty of Geosciences and Environmental Engineering Southwest Jiaotong UniversityChengdu 611756China Analysis and Test Center of Sichuan Province Chengdu 610023China

To learn the process of urban land evolution before and after an earthquake is vital to formulate the urban reconstruction control policies and recovery measures in the earthquake-stricken ***,spatiotemporal evolution and its driving factors of urban land in earthquake-prone areas remains limited due to the scarcity of ground observation *** research,leveraging night-time light remote sensing imagery and land cover data,conducted a comprehensive analysis of the long-term evolution characteristics of urban land in earthquake-prone *** introduced methodologies for assessing the socio-economic impact and the primary natural environmental factors driving urban land evolution in these *** validate the proposed methods,the 2008 Wenchuan earthquake-affected area in China was selected as a representative study *** results indicated that the average Digital Number(DN)values in socio-economically impacted areas showed a trend of rising,falling,and then rising again after the *** values in three types of damaged areas including Type Ⅱ,Type Ⅲ,and Type Ⅳ exceeded pre-earthquake *** analysis of determinative factors influencing urban land evolution revealed that slope and elevation were key elements in controlling urban land expansion before the earthquake,whereas factors such as slope,elevation,lithology,and faults had a stronger influence on urban land expansion after the *** can be seen that,in view of the differences in the natural conditions of regions for post-disaster reconstruction,the local government need to actively adjust and adapt to urban spatial planning,so as to leverage the scale effect of large-scale inputs of funds,facilities,human resources and other factors after the disaster,thus enhancing resilience and recovery efficiency in response to disaster impacts.

关键词： Wenchuan earthquake Night-time lights Urban land Post-earthquake reconstruction

Compositional and geochronological signatures of metamafic dykes from the Sangsang peridotites, South Tibet: Evidence for magma-starved forearc rifting during Neo-Tethyan subduction re-initiation

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Geoscience Frontiers 2020年第6期11卷 2271-2286页

作者： Chi Xu hao zheng Argyrios Kapsiotis Yang Xiao Zhifeng Wan School of Marine Sciences Sun Yat-sen UniversityZhuhai 519000China Southern Laboratory of Ocean Science and Engineering(Guangdong Zhuhai)Zhuhai 519000China

In this study we present new mineral chemistry,whole-rock geochemical and zircon U-Pb geochronological data for 12 metamafic dykes in the mantle sequence of the Sangsang ophiolite in South Tibet(China).Modal analyses of these dykes gave averages of^40%-65%plagioclase and^35%-60%amphibole and small amounts of(igneous)clinopyroxene,epidote and opaque *** mineral assemblage resembles that of typical ***,due to the absence of foliation the investigated rocks are described as metamafic *** rocks have primitive mantle(PM)-normalized multi-element patterns with negative Nb and Ta anomalies as well as weak,negative Ti *** addition,they have initial 87Sr/86Sr ratios[(87Sr/86Sr)1]of0.702844-0.703581,initial 143Nd/144Nd ratios[(143Nd/144Nd)i]of 0.512891-0.512959 and high εNd(t)values(+7.9 to+9.3).Uranium-Pb ages of magmatic zircons separated from the investigated metamafic dykes indicate that the parental melts of their protoliths intruded the Sangsang mantle at^119.0-118.5 *** metamorphic mineral assemblages recognized in the investigated dykes are suggestive of a retrograde metamorphic process,from(epidote-)amphibolite facies(~470-610℃,-1.9-4.3 kbar)and to prehnitepumpellyite facies(≤280℃,<3 kbar),active within a rift-produced oceanic *** and geochemical data suggest that the protoliths of the dykes were most likely massive *** data show that the parental magmas of the gabbroic protoliths were generated by melting of a depleted mantle(DM)source that had been weakly modified by fluids emanating from a subducted oceanic lithospheric *** age of the gabbroic protoliths is slightly younger than the existing ages for ophiolites from the central Yarlung-Zangbo Suture Zone(YZSZ)in the literature(~129-123 Ma).We,therefore,suggest that the gabbroic protoliths of the Sangsang metamafic dykes were formed in an incipient forearc setting during Neo-Tethyan subduction reinitiation(Ap

关键词： Zircon Dyke Ophiolite Sangsang Tibet Neo-Tethys

Food nutrition and toxicology targeting on specific organs in the era of single-cell sequencing

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Food Science and Human Wellness 2024年第1期13卷 75-89页

作者： Xiaofei Wang Xiaowen Cheng Huiling Liu Xiaohuan Mu hao zheng National Engineering Technology Research Center for Fruit and Vegetable Processing Key Open Laboratory of Fruit and Vegetable ProcessingMinistry of Agriculture and Rural AffairsBeijing Key Laboratory of Food Non-Thermal ProcessingCollege of Food Science and Nutritional EngineeringChina Agricultural UniversityBeijing 100083China

Due to the complex natures of dietary food components,it is difficult to elucidate how the compounds affect host *** food often selectively presents its mechanism of action on different cell types,and participates in the modulation of targeted cells and their microenvironments within ***,the limitations of traditional in vitro assays or in vivo animal experiments cannot comprehensively examine cellular heterogeneity and the tissue-biased ***-cell RNA sequencing(sc RNA-seq)has emerged as an indispensable methodology to decompose tissues into different cell types for the demonstration of transcriptional profiles of individual *** RNA-seq applications has been summarized on three typical organs(brain,liver,kidney),and two representative immune-and tumor related health *** everincreasing role of sc RNA-seq in dietary food research with further improvement can provide sub-cellular information and the coupling between other cellular *** this review,we propose utilizing sc RNAseq to more effectively capture the subtle and complex effects of food chemicals,and how they may lead to health problems at single-cell *** novel technique will be valuable to elucidate the underlying mechanism of both the health benefits of food nutrients and the detrimental consequences food toxicants at the cellular level.

关键词： Dietary food Cellular heterogeneity Single-cell RNA sequencing Food nutrients Food toxicants

DLF-YOLOF:an improved YOLOF-based surface defect detection for steel plate

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Journal of Iron and Steel Research International 2024年第2期31卷 442-451页

作者： Guang-hu Liu Mao-xiang Chu Rong-fen Gong Ze-hao zheng School of Electronic and Information Engineering University of Science and Technology LiaoningAnshan114051LiaoningChina

Surface defects can affect the quality of steel *** methods based on computer vision are currently applied to surface defect detection of steel ***,their real-time performance and object detection of small defect are still *** improved object detection network based on You Only Look One-level Feature(YOLOF)is proposed to show excellent performance in surface defect detection of steel plate,called ***,the anchor-free detector is used to reduce the network ***,deformable convolution network and local spatial attention module are introduced into the feature extraction network to increase the contextual information in the feature ***,the soft non-maximum suppression is used to improve detection accuracy ***,data augmentation is performed for small defect objects during training to improve detection *** show the average precision and average precision for small objects are 42.7%and 33.5%at a detection speed of 62 frames per second on a single GPU,*** shows that DLF-YOLOF has excellent performance to meet the needs of industrial real-time detection.

关键词： Steel surface defects detection YOLOF Anchor-free detector Small object detection Real-time detection