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| 1 | A high speed 1000 fps CMOS image sensor with low noise global shutter pixels显示文摘A low read noise 8T global shutter pixel for high speed CMOS image sensor is proposed in this paper.The pixel has a pixel level sample-and-hold circuit and an in-pixel amplifier whose gain is larger than one.Using pixel level sample-and-hold circuit,the KTC noise on FD node can be effectively cancelled by correlated double sampling operation.The in-pixel amplifier with a gain larger than one is employed for reducing the pixel level sample-and-hold capacitors thermal noise and their geometric size.A high speed 1000 fps 256×256 CMOS image sensor based on the pixel is implemented in 0.18μm CMOS process.The chip active area is 5 mm×7 mm with a pixel size of 14μm×14μm.The developed sensor achieves a read noise level as low as 14.8e-while attaining a high fill factor of 40%.The full well capacity can contain 30840e-and the resulting signal dynamic range is 66 dB. | ZHOU YangFan CAO ZhongXiang QIN Qi LI QuanLiang SHI Cong WU NanJian | 2014 | Science China(Information Sciences)2014，57，4： | 8 |
| 2 | Radiotherapy targeting cancer stem cells “awakens” them to induce tumour relapse and metastasis in oral cancer显示文摘Radiotherapy is one of the most common treatments for oral cancer. However, in the clinic, recurrence and metastasis of oral cancer occur after radiotherapy, and the underlying mechanism remains unclear. Cancer stem cells(CSCs), considered the 'seeds'of cancer, have been confirmed to be in a quiescent state in most established tumours, with their innate radioresistance helping them survive more easily when exposed to radiation than differentiated cancer cells. There is increasing evidence that CSCs play an important role in recurrence and metastasis post-radiotherapy in many cancers. However, little is known about how oral CSCs cause tumour recurrence and metastasis post-radiotherapy. In this review article, we will first summarise methods for the identification of oral CSCs and then focus on the characteristics of a CSC subpopulation induced by radiation, hereafter referred to as 'awakened'CSCs, to highlight their response to radiotherapy and potential role in tumour recurrence and metastasis post-radiotherapy as well as potential therapeutics targeting CSCs. In addition, we explore potential therapeutic strategies targeting these 'awakened' CSCs to solve the serious clinical challenges of recurrence and metastasis in oral cancer after radiotherapy. | Yangfan Liu Miao Yang Jingjing Luo Hongmei Zhou | 2020 | International Journal of Oral Science2020，12，2： | 4 |
| 3 | Localizing root causes of performance anomalies in cloud computing systems by analyzing request trace logs显示文摘It is hard to localize the primary cause of performance anomalies in cloud computing systems because of the complexity of interactions between components.The hidden connections in the huge number of request execution paths in such systems usually contain useful information for diagnosing performance anomalies.We propose an approach to localize anomalous invoked methods and their physical locations by leveraging request trace logs,which involves two steps:(1) firstly,cluster the requests according to their corresponding call sequences,identify anomalous requests with principal component analysis,and then pick out anomalous methods with Mann-Whitney hypothesis test;(2) secondly,compare the behavior similarities of all replicated instances of the anomalous methods with Jensen-Shannon divergence,and select the ones whose behaviors are different from those of others,which will be chosen as the final culprits of performance anomalies.We conduct experiments with four real-world cases to validate our approach in Alibaba Cloud Computing Inc.The results demonstrate that our approach can locate the prime causes of performance anomalies with the low false-positive rate and false-negative rate. | MI HaiBo WANG HuaiMin ZHOU YangFan LYU Michael CAI Hua | 2012 | Science China(Information Sciences)2012，55，12： | 4 |
| 4 | A low power global shutter pixel with extended FD voltage swing range for large format high speed CMOS image sensor显示文摘A low power 8T global shutter pixel with extended FD voltage swing range is proposed for large format high speed CMOS image sensor. The pixel has a negative threshold reset transistor, two in-pixel source followers, and a sample-and-hold circuit. The in-pixel first source follower is employed for reducing the pixel average current and maximum transient current. The negative threshold reset transistor is applied to extend the voltage swing of FD. Using pixel level sample-and-hold circuit, the k TC noise on FD node can be effectively nullified by correlated double sampling operation. A high speed 1000 fps 256×256 CMOS image sensor is implemented in 0.18 μm CMOS process. Two 10-bit cyclic ADC arrays are integrated in this prototype sensor chip. The active area of the chip is 10 mm×7 mm with a pixel size of 14 μm×14 μm. The developed sensor achieves an average current of 23 n A per pixel, a maximum transit current per pixel as low as 1113 n A, and a large FD voltage swing of 1.78 V. The sensor temporal noise level is 103 e-and full well capacity has 27000 e-which results in 48.3 d B signal dynamic range. | ZHOU YangFan CAO ZhongXiang HAN Ye LI QuanLiang SHI Cong DOU RunJiang QIN Qi LIU Jian WU NanJian | 2015 | Science China(Information Sciences)2015，58，4： | 4 |
| 5 | Investigation of a coupling model of coordination between urbanization and the environment显示文摘 | Li Yangfan Li Yi Zhou Yan | 2012 | Journal of Environmental Management2012，，98： | 1 |
| 6 | Investigation of a coupling model of coordination between urbanization and the environment 显示文摘 | LI Yangfan LI Yi ZHOU Yan | 2012 | Environmental Management2012，98，： | 1 |
| 7 | Investigation of a coupling model of coordination between urbanization and the environment显示文摘 | Yangfan Li Yi Li Yan Zhou Yalou Shi Xiaodong Zhu | 2012 | Journal of Environmental Management2012，，： | 1 |
| 8 | Investigation of a coupling model of coordination between urbanization and the environment 显示文摘 | Yangfan Li Yi Li Yan Zhou | 2012 | Journal of Environmental Management2012，98，1： | 1 |
| 9 | Investigation of a coupling model of coordination between urbanization and the environment显示文摘 | Li Yangfan Li Yi Zhou Yan | 2012 | Journal of Environmental Management2012，98，2012： | 1 |
| 10 | MDiag:mobility-assisted diagnosis for wireless sensor networks显示文摘 | Xiong Junjie Zhou Yangfan Lyu M R | 2013 | Journal of Network and Computer Applications2013，36，1： | 1 |
| 11 | Layered obfuscation:a taxonomy of software obfuscation techniques for layered security显示文摘Software obfuscation has been developed for over 30 years.A problem always confusing the communities is what security strength the technique can achieve.Nowadays,this problem becomes even harder as the software economy becomes more diversified.Inspired by the classic idea of layered security for risk management,we propose layered obfuscation as a promising way to realize reliable software obfuscation.Our concept is based on the fact that real-world software is usually complicated.Merely applying one or several obfuscation approaches in an ad-hoc way cannot achieve good obscurity.Layered obfuscation,on the other hand,aims to mitigate the risks of reverse software engineering by integrating different obfuscation techniques as a whole solution.In the paper,we conduct a systematic review of existing obfuscation techniques based on the idea of layered obfuscation and develop a novel taxonomy of obfuscation techniques.Following our taxonomy hierarchy,the obfuscation strategies under different branches are orthogonal to each other.In this way,it can assist developers in choosing obfuscation techniques and designing layered obfuscation solutions based on their specific requirements. | Hui Xu Yangfan Zhou Jiang Ming Michael Lyu | 2020 | Cybersecurity2020，3，1： | 1 |
| 12 | An online service-oriented performance profiling tool for cloud computing systems显示文摘 | Haibo MI Huaimin WANG Yangfan ZHOU Michael Rung-Tsong LY~ Hua CAI Gang YIN | 2013 | Frontiers of Computer Science2013，7，3： | 1 |
| 13 | Investigation of a coupling model of coordination between urbanization and the environment显示文摘 | Yangfan Li Yi Li Yan Zhou | 2012 | Journal of Environmental Management2012，，98： | 1 |
| 14 | Selective substitution induced anomalous phonon stiffening within quasi-one-dimensional P–P chains in SiP2显示文摘Light-matter interactions in low-dimensional quantum-confined structures can dominate the optical properties of the materials and lead to optoelectronic applications.In anisotropic layered silicon diphosphide(SiP2)crystal,the embedded quasi-onedimensional(1D)phosphorus–phosphorus(P–P)chains directly result in an unconventional quasi-1D excitonic state,and a special phonon mode vibrating along the P–P chains,establishing a unique 1D quantum-confined system.Alloying SiP2 with the homologous element serves as an effective way to study the properties of these excitons and phonons associated with the quasi-1D P–P chains,as well as the strong interaction between these quasiparticles.However,the experimental observation and the related optical spectral understanding of SiP2 with isoelectronic dopants remain elusive.Herein,with the photoluminescence and Raman spectroscopy measurements,we demonstrate the redshift of the confined excitonic peak and the stiffening of the phonon vibration mode■of a series of Si(P1−xAsx)2 alloys with increasing arsenic(As)compositions.This anomalous stiffening of■is attributed to the selective substitution of As atoms for P atoms within the P–P chains,which is confirmed via our scanning transmission electron microscopy investigation.Such optical spectra evolutions with selective substitution pave a new way to understand the 1D quantum confinement in semiconductors,offering opportunities to explore quasi-1D characteristics in SiP2 and the resulting photonic device application. | Xueting Dai Feng Qin Caiyu Qiu Ling Zhou Junwei Huang Fanghua Cheng Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Shengqiang Wu Xiaoxu Zhao Yangfan Lu Huiyang Gou Hongtao Yuan | 2023 | Nano Research2023，16，1： | 0 |
| 15 | Enhancing hydrogen storage properties of MgH_(2) using FeCoNiCrMn high entropy alloy catalysts显示文摘Herein,we report the successful preparation of the FeCoNiCrMn high entropy alloy(HEA)loaded MgH_(2) and HEA’s effect on the hydrogen storage properties of Mg/MgH_(2).The HEA shows high catalytic activity toward hydrogen dissociation and recombination reaction,and successfully suppressed activation energy of dehydrogenation reaction from 151.9 to 90.2 kJ mol-1.Moreover,part of Co and Ni can react with Mg,and produce Mg_(2) Co/Mg_(2) CoH 5 and Mg_(2) Ni/Mg_(2) NiH_(4) during the hydrogen storage processes,further en-hancing dehydrogenation reaction through the“hydrogen pumping”mechanism.Asa result,the MgH_(2)-5 wt%HEA composite can release 5.6 wt%of H_(2) at 280℃ within 10 min,and absorb 5.5 wt%H_(2) within 0.5 min at 150℃.The loaded HEA shows robustness against particle aggregation,leading to stable re-versible hydrogen storage processes at least 50 times.These findings show the synergistic effects of HEA on Mg-based hydrogen storage materials,providing an additional degree of freedom for catalyst design. | Haiyi Wan Xiu Yang Shiming Zhou Lei Ran Yangfan Lu Yu’an Chen Jingfeng Wang Fusheng Pan | 2023 | Journal of Materials Science & Technology2023，，18： | 0 |
| 16 | Strain engineering of anisotropic light-matter interactions in onedimensional P-P chain of SiP_(2)显示文摘Strain engineering can serve as a powerful technique for modulating the exotic properties arising from the atomic structure of materials.Examples have been demonstrated that one-dimensional(1D)structure can serve as a great platform for modulating electronic band structure and phonon dispersion via strain control.Particularly,in a van der Waals material silicon diphosphide(SiP_(2)),quasi-1D zigzag phosphorus–phosphorus(P–P)chains are embedded inside the crystal structure,and can show unique phonon vibration modes and realize quasi-1D excitons.Manipulating those optical properties by the atom displacements via strain engineering is of great interest in understanding underlying mechanism of such P–P chains,however,which remains elusive.Herein,we demonstrate the strain engineering of Raman and photoluminescence(PL)spectra in quasi-1D P–P chains and resulting in anisotropic manipulation in SiP_(2).We find that the phonon frequencies of SiP_(2)in Raman spectra linearly evolve with a uniaxial strain along/perpendicular to the quasi-1D P–P chain directions.Interestingly,by applying tensile strain along the P–P chains,the band gap energy of strained SiP_(2)can significantly decrease with a tunable value of~55 meV.Based on arsenic(As)element doping into SiP_(2),the strain-induced redshifts of phonon frequencies decrease,indicating the stiffening of the phonon vibration with the increased arsenic doping level.Such results provide an opportunity for strain engineering of the light–matter interactions in the quasi-1D P–P chains of SiP_(2)crystal for potential optical applications. | Fanghua Cheng Junwei Huang Feng Qin Ling Zhou Xueting Dai Xiangyu Bi Caorong Zhang Zeya Li Ming Tang Caiyu Qiu Yangfan Lu Huiyang Gou Hongtao Yuan | 2022 | Nano Research2022，15，8： | 0 |
| 17 | A Synthesis of Geophysical Data in Southeastern North China Craton:Implications for the Formation of the Arcuate Xuhuai Thrust Belt显示文摘The Xuhuai fold thrust belt(XHTB)is a curved structure in the southeastern margin of the North China Craton(NCC)that has attracted great attentions due to its tectonic and petrological characteristics.However,few geophysical studies have focused on the deep structure of this belt.In this study,we carry out a systematic demonstration of the main geophysical features that characterize the XHTB and surrounding areas.The results reveal small negative gravity and magnetic anomalies,thin crust and lithosphere,lower shear velocity and shallower earthquake epicenters relative to other areas of the NCC,collectively indicating a lithospheric-scale rheological anomaly at this belt.The magnetic alignments show a trend similar to that of geological units in southeastern NCC and adjacent areas,although they differ from the SKS-splitting fast polarization directions,except in the Qinling-Dabie orogen where a vertical coherent deformation of the crust and mantle may be involved there.Based on the geophysical data,we propose a detachment-controlled model,which was caused by the different detachment depth/strength,for the formation of XHTB to explain its arcuate shape as well as the magnetic alignments,thus providing new insight into the deep processes of southeastern NCC. | Yangfan Deng Yun Chen Pengfei Li Zhou Zhang JoséBadal | 2022 | Journal of Earth Science2022，33，3： | 0 |
| 18 | Layered obfuscation:a taxonomy of software obfuscation techniques for layered security显示文摘Software obfuscation has been developed for over 30 years.A problem always confusing the communities is what security strength the technique can achieve.Nowadays,this problem becomes even harder as the software economy becomes more diversified.Inspired by the classic idea of layered security for risk management,we propose layered obfuscation as a promising way to realize reliable software obfuscation.Our concept is based on the fact that real-world software is usually complicated.Merely applying one or several obfuscation approaches in an ad-hoc way cannot achieve good obscurity.Layered obfuscation,on the other hand,aims to mitigate the risks of reverse software engineering by integrating different obfuscation techniques as a whole solution.In the paper,we conduct a systematic review of existing obfuscation techniques based on the idea of layered obfuscation and develop a novel taxonomy of obfuscation techniques.Following our taxonomy hierarchy,the obfuscation strategies under different branches are orthogonal to each other.In this way,it can assist developers in choosing obfuscation techniques and designing layered obfuscation solutions based on their specific requirements. | Hui Xu Yangfan Zhou Jiang Ming Michael Lyu | 2018 | Cybersecurity2018，1，1： | 0 |
| 19 | Shock Initiation Experiments with Modeling on a DNAN Based MeltCast Insensitive Explosive显示文摘2,4-dinitroanisole(DNAN)is a good replacement for 2,4,6-trinitrotoluene(TNT)in melt-cast explosives due to its superior insensitivity.With the increasing use of DNAN-based melt-cast explosives,the prediction of reaction violence and hazard assessment of the explosives subjected to shock is of great significance.This study investigated the shock initiation characteristics for a DNAN-based melt-cast explosive,DHFA,using the one-dimensional Lagrangian apparatus.The embedded manganin gauges in the apparatus record the pressure histories at four Lagrangian positions and show that shock-todetonation transition in DHFA needs a high input shock pressure.The experimental data are analyzed to calibrate the Ignition and Growth model.The calibration is performed using an objective function based on both pressure history and the arrival time of shock.Good agreement between experimental and calculated pressure histories indicates the high accuracy of the calibrated parameters with the optimization method. | Feichao Miao Dandan Li Yangfan Cheng Junjiong Meng Lin Zhou | 2024 | Defence Technology(防务技术)2024，32，2： | 0 |
| 20 | Optically Controlled Coercive Field of MAPbl_(3)/P(VDF-TrFE)Ferroelectric Composite Films显示文摘Ferroelectric polymers,such as poly(vinylidene fluoride-trifluoroethylene)[P(VDF-TrFE)or PVTF]have attracted growing interest in developing flexible devices because of their excellent ferroelectricity and piezoelectricity.High coercive field(E c)inherent to PVTF for switching its polarization,however,is not beneficial for practical memory or sensor device application.Different strategies,including irradiation and interface control,have been thus developed to reduce E c.Despite many efforts,a facile approach to tailoring intrinsic E_(c) of PVTF has not been documented.In this work,an optically controlled E_(c) was reported,which is achieved for the first time by introducing photosensitive MAPbI3 nanocrystals into PVTF matrix.When exposed to the irradiation of 532 nm laser light,a decreased E_(c) of the composites can be achieved reversibly by increasing the light density.The decreased level of E_(c) increases as the MAPbI3 content enhanced,and a 10.7%reduction of E_(c) can be achieved in 15%(mass fraction)MAPbI3/PVTF samples.These results could be attributed to loading an internal stress on PVTF,which was generated by the photostriction of MAPbI3 nanocrystals.This explanation was further supported by in-situ XRD results under irradiation of 532 nm laser light.Our findings may offer the opportunity to optically modulate the ferroelectric properties of PVTF composites for optimized device performances. | SU Yangfan SUN Yiran ZHOU Dikui TANG Xiaoming HAN Gaorong REN Zhaohui | 2023 | Chemical Research in Chinese Universities2023，39，2： | 0 |
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