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A hybrid brain-computer interface control strategy in a virtual environment

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第5期12卷 351-361页

作者： yu su Qiushi Academy.for Advanced Studies Zhejiang University Hangzhou 310022 China School of Computer Science and Technology Zhejiang University Hangzhou 310027 China Department of Biomedical Engineering Zhejiang University Hangzhou 310027 China Key Laboratory of Biomedical Engineering of the Ministry of Education. Hangzhou 310027.China

This paper presents a hybrid brain-computer interface (BCI) control strategy,the goal of which is to expand control functions of a conventional motor imagery or a P300 potential based BCI in a virtual *** hybrid control strategy utilizes P300 potential to control virtual devices and motor imagery related sensorimotor rhythms to navigate in the virtual *** two electroencephalography (EEG) patterns serve as source signals for different control functions in their corresponding system states,and state switch is achieved in a sequential *** the current system,imagination of left/right hand movement was translated into turning left/right in the virtual apartment continuously,while P300 potentials were mapped to discrete virtual device control commands using a five-oddball *** combination of motor imagery and P300 patterns in one BCI system for virtual environment control was tested and the results were compared with those of a single motor imagery or P300-based *** obtained similar performances in the hybrid and single control tasks,which indicates the hybrid control strategy works well in the virtual environment.

关键词： Hybrid brain-computer interface (BCI) control strategy P300 potential Sensorimotor rhythms Virtual environment

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面向自动语音识别系统的对抗样本生成方法

计算机科学与探索 2025年第1期19卷 253-263页

作者：于振华苏玉璠叶鸥丛旭亚西安科技大学计算机科学与技术学院

通过对系统进行对抗攻击可以检测系统漏洞，进而提高系统鲁棒性。然而，对抗攻击前往往需要系统的参数信息，这使得攻击条件受限。为此，结合一种新的量子粒子群优化算法，提出一种黑盒有目标对抗攻击方法。该方法通过在原始样本中添加... 详细信息

通过对系统进行对抗攻击可以检测系统漏洞，进而提高系统鲁棒性。然而，对抗攻击前往往需要系统的参数信息，这使得攻击条件受限。为此，结合一种新的量子粒子群优化算法，提出一种黑盒有目标对抗攻击方法。该方法通过在原始样本中添加微小噪声，构造差异化粒子群，作为初始对抗样本种群；基于记忆搜索的领域重分布策略得到当前种群的全局最优粒子，从而生成初始对抗样本；融入扩维和自适应权重位置更新，使得种群更接近目标；根据对抗样本与目标语句的编辑距离，继续优化初始对抗样本，生成最终对抗样本。为了验证方法的攻击效果，在GoogleSpeech、LibriSpeech以及CommonVoice数据集上，对语音识别模型DeepSpeech进行实验，将目标语句设置为不同场景中的常见语音指令。实验结果表明，提出的方法在三个数据集上成功率都优于对比方法，其中在Common Voice数据集上的成功率比对比方法提升了10个百分点。同时，召集志愿者对生成的对抗样本噪声强度进行主观评估，其中82.4%的对抗样本被志愿者判断为没有噪声或噪声很小。

关键词：对抗攻击语音识别黑盒攻击样本生成量子粒子群算法梯度评估方法

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Free Information Flow Benefits Truth Seeking

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Journal of Systems Science & Complexity 2018年第4期31卷 964-974页

作者： su Wei yu Yongguang School of Automation and Electrical Engineering University of Science and Technology Beijing Beijing 100083 China Key Laboratory of Knowledge Automation for Industrial Processes Ministry of Education Beijing 100083 China School of Science Beijing Jiaotong University Beijing 100044 China

How can we approach the truth in a society？ It may depend on various factors. In this paper, using a well-established truth seeking model, the authors show that the persistent free information flow will bring us to the truth. Here the free information flow is modeled as the environmental random noise that could alter one＇s cognition. Without the random noise, the model predicts that the truth can only be captured by the truth seekers who own actively perceptive ability of the truth and their believers, while the other individuals may stick to falsehood. But under the influence of the random noise, the authors strictly prove that even there is only one truth seeker in the group, all individuals will finally approach the truth.

关键词： Free information flow opinion dynamics random noise social networks truth seeking

Probabilistic modeling of scenes using object frames

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Science China(Information Sciences) 2015年第3期58卷 119-131页

作者： su Hao yu AdamsWei School of Mathematics Beihang University Department of Computer Science Stanford University Language Technologies Institute Carnegie Mellon University

In this paper,we propose a probabilistic scene model using object frames,each of which is a group of co-occurring objects with fixed spatial *** contrast to standard co-occurrence models,which mostly explore the pairwise co-existence of objects,the proposed model captures the spatial relationship among groups of *** information is closely tied to the semantics of the underlying scenes,which allows us to perform object detection and scene recognition in a unified *** proposed probabilistic model has two major *** first models the dependencies between object frames and objects by adopting the Latent Dirichlet Allocation model for text *** second component characterizes the dependencies between object frames and scenes by establishing a mapping between global image features and object frame *** results show that the induced object frames are both semantically meaningful and spatially *** addition,our model significantly improves the performance of object recognition and scene retrieval.

关键词： Bayes network scene understanding object frame probabilistic model

Characteristics of bifurcation and buckling load of space truss in consideration of initial imperfection and load mode

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第3期14卷 206-218页

作者： su-deok SHON Seung-jae LEE Kang-guk LEE School of Architectural Engineering Korea University of Technology and Education1800 ChungjeolroCheonan ChungnamRepublic of Korea Research Center for Urban Affair Kyungil UniversityGyeongsan-city GyeongbukRepublic of Korea

This study investigated characteristics of bifurcation and critical buckling load by shape imperfection of space truss,which were sensitive to initial *** critical point and buckling load were computed by the analysis of the eigenvalues and determinants of the tangential stiffness *** two-free-nodes example and star dome were selected for the case study in order to examine the nodal buckling and global buckling by the sensitivity to the eigen buckling mode and the analyses of the influence,and characteristics of the parameters as defined by the load ratio of the center node and surrounding node,as well as rise-span ratio were *** sensitivity to the imperfection of the initial shape of the two-free-nodes example,which occurs due to snapping at the critical point,resulted in bifurcation before the limit point due to the buckling mode,and the buckling load was reduced by the increase in the amount of *** two sensitive buckling patterns of the numerical model are established by investigating the displaced position of the free nodes,and the asymmetric eigenmode greatly influenced the behavior of the imperfection shape whether it was at limit point or ***,the sensitive mode of the two-free-nodes example was similar to the in-extensional basis mechanism of a simplified *** star dome,which was used to examine the influence among several nodes,indicated that the influence of nodal buckling was greater than that of global buckling as the rise-span ratio was ***,global buckling is occurred with reaching bifurcation point as the value of load ratio was higher,and the buckling load level was about 50%-70% of load level at limit point.

关键词： Space truss Geometric nonlinearity Initial imperfection Snap-through Bifurcation Global buckling

On the behavior of the product of independent random variables

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Science China Mathematics 2006年第3期49卷 342-359页

作者： su Chun CHEN yu Department of Statistics and Finance University of Science and Technology of China Hefei 230026 China Department of Statistics and Finance University of Science and Technology of China Hefei 230026 China

For two independent non-negative random variables X and Y, we treat X as the initial variable of major importance and Y as a modifier (such as the interest rate of a portfolio).Stability in the tail behaviors of the product compared with that of the original variable X is of practical interests. In this paper, we study the tail behaviors of the product XY when the distribution of X belongs to the classes L and S, respectively. Under appropriate conditions, we show that the distribution of the product XY is in the same class as X when X belongs to class L or S, in other words, classes L and S are stable under some mild conditions on the distribution of Y. We also show that if the distribution of X is in class L(γ) (γ＞ 0) and continuous, then the product XY is in L if and only if Y is unbounded.

关键词： independent product, stability, tails of a distribution, heavy-tailed.

Luminescent terpyridine-based metallo-supramolecular systems:from design to applications

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Science China Chemistry 2023年第7期66卷 1940-1962页

作者： Chenxing Guo Feng su Pingru su Xiujun yu Xiaopeng Li College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518060China Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging National-Regional Key Technology Engineering Laboratory for Medical UltrasoundSchool of Biomedical EngineeringShenzhen University Medical SchoolShenzhen 518060China Shenzhen University General Hospital Shenzhen University Clinical Medical AcademyShenzhen 518055China

Luminescent metallo-supramolecules have received tremendous attention in recent years owing to their diverse yet well-defined structures,tunable luminescent properties,and broad *** this context,the development of terpyridine(tpy)-based luminescent metallo-supramolecular systems has seen rapid *** review aims to summarize the recent progress of luminescent metallo-supramolecular assemblies from tpy ligands with metal ions,with a focus on discrete metallo-supramolecular architectures and metallo-supramolecular *** design strategies and common approaches for tuning the luminescence properties are detailed along with representative ***,the pitfalls and unmet challenges regarding the structural characterization and practical applications of tpy-based metallo-supramolecules are discussed followed by our perspectives on the future directions of this field.

关键词： luminescence metallo-supramolecules terpyridine coordination-driven self-assembly supramolecular chemistry

Tenebrio molitor Gram-negative-binding protein 3 (TmGNBP3)is essential for inducing downstream antifungal Tenecin 1 gene expression against infection with Beauveria bassiana JEF-007

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Insect Science 2018年第6期25卷 969-977页

作者： Yi-Ting Yang Mi Rong Lee Se Jin Lee Sihyeon Kim yu-Shin Nai jae su Kim Department of Agricultural Biology Chonbuk National UniversityKorea Department of Biotechnology and Animal Science National llan UniversityllanTaiwanChina plant Medical Research Center College of Agricultural and Life SciencesChonbuk National UniversityJenojuKorea

The Toll signaling pathway is responsible for defense against both Grampositive bacteria and ***-negative binding protein 3(GNBP3)has a strong affinity for the fungal cell wall component,β-1,3-glucan,which can activate the prophenoloxidase (proPO)cascade and induce the Toll signaling *** differentiation factor 88 (MyD88)is an intracellular adaptor protein involved in the Toll signaling *** this study,we monitored the response of 5 key genes (TmGNBP3,TmMyD88,and Tenecin 1,2, and 3)in the Toll pathway of the mealworm Tenebrio molitor immune system against the fungus Beauveria bassiana JEF-007 using ***3,Tenecin 1,and Tenecin 2 were significantly upregulated after fungal *** better understand the roles of the Toll signaling pathway in the mealworm immune system,TmGNBP3and TmMyD88 were knocked down by RNAi *** gene expression levels decreased at 2 d postknockdown and were dramatically reduced at 6 d post-dsRNA ***, mealworms were compromised by *** JEF-007at 6d post-dsRNA injection. Silencing of TmMyD88 and TmGNBP3 resulted in reduced resistance of tilde host to fun- gal ***,reducing TmGNBP3 levels obviously downregulated Tenecin 1 and Tenecin 2expression levels,whereas silencing TmMyD88 expression resulted in de- creased Tenecin 2 *** results indicate that TmGNBP3 is essential to induce downstream antifungal peptide Tenecin i expression against *** JEF-007.

关键词： Beauveria bassiana RNAi Tenebrio molitor TmGNBP3 TmMyD88

Error model identification of inertial navigation platform based on errors-in-variables model

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Journal of Systems Engineering and Electronics 2009年第2期20卷 388-393页

作者： Liu Ming Liu yu su Baoku Space Control and Inertial Technology Research Center Harbin Inst. of Technology Harbin 150001 P. R. China

Because the real input acceleration cannot be obtained during the error model identification of inertial navigation platform, both the input and output data contain noises. In this case, the conventional regression model and the least squares （LS） method will result in bias. Based on the models of inertial navigation platform error and observation error, the errors-in-variables （EV） model and the total least squares （TLS） method axe proposed to identify the error model of the inertial navigation platform. The estimation precision is improved and the result is better than the conventional regression model based LS method. The simulation results illustrate the effectiveness of the proposed method.

关键词： errors-in-variables model total least squares method inertial navigation platform error model identification