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An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system Research Articles

Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 10,   Pages 1390-1401 doi: 10.1631/FITEE.2000373

Abstract: In the semiconductor manufacturing industry, the dynamic model of a controlled object is usually obtained from a frequency sweeping method before motion control. However, the existing isolators cannot properly isolate the disturbance of the inertial force on the platform base during frequency sweeping (the frequency is between 0 Hz and the natural frequency). In this paper, an for a system (DSA-SAVIS) is proposed. This system has a significant anti-resonance characteristic; that is, the vibration amplitude can drop to nearly zero at a particular frequency, which is called the anti-resonance frequency. The proposed controller is designed to add an adjustable anti-resonance frequency to fully use this unique anti-resonance characteristic. Experimental results show that the closed-loop transmissibility is less than −15 dB from 0 Hz to the initial anti-resonance frequency. Furthermore, it is less than −30 dB around an added anti-resonance frequency which can be adjusted from 0 Hz to the initial anti-resonance frequency by changing the parameters of the proposed controller. With the proposed controller, the disturbance amplitude of the payload decays from 4 to 0.5 mm/s with a reduction of 87.5% for the impulse disturbance applied to the platform base. Simultaneously, the system can adjust the anti-resonance frequency point in real time by tracking the frequency sweeping disturbances, and a good vibration isolation performance is achieved. This indicates that the DSA-SAVIS and the proposed controller can be applied in the guarantee of an ultra-low vibration environment, especially at frequency sweeping in the semiconductor manufacturing industry.

Keywords： 半主动隔振；双级驱动；动态吸振；可调反共振频率控制器    

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Study on Semi-active Control of Multi-dim Damping Platform Based on Parallel Mechanism and MR Damper

Zhu Wei,Ma Lüzhong,Chen Xiuxiang,Wu Weiguang,Xie Jun

Strategic Study of CAE 2007, Volume 9, Issue 11,   Pages 63-67

Abstract:

MR damper is analyzed on its mechanical characteristic, and is applied in multi-dimension damping in this paper.  A kind of three-translation parallel mechanism is used as main mechanism of multi-dim damping,  whose position and dynamics formula are deduced.  The input signal of controller is from the result of equation of kinematics,  and LQR is used as the semi-active control arithmetic.  Considering complexity of the dynamics equation in dynamic process,  a way is used in control progress when the mechanism is in a steady state through which the entire flat roof is limited adjacent to an equilibrium position.  The result of emulation confirms that the controller is effective.

Keywords： parallel mechanism     multi-dim damping     MR damper     semi-active control    

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Ensemble enhanced active learning mixture discriminant analysis model and its application for semi-supervised fault classification Research Article

Weijun WANG, Yun WANG, Jun WANG, Xinyun FANG, Yuchen HE

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 12,   Pages 1814-1827 doi: 10.1631/FITEE.2200053

Abstract: As an indispensable part of process monitoring, the performance of relies heavily on the sufficiency of process knowledge. However, data labels are always difficult to acquire because of the limited sampling condition or expensive laboratory analysis, which may lead to deterioration of classification performance. To handle this dilemma, a new strategy is performed in which enhanced is employed to evaluate the value of each unlabeled sample with respect to a specific labeled dataset. Unlabeled samples with large values will serve as supplementary information for the training dataset. In addition, we introduce several reasonable indexes and criteria, and thus human labeling interference is greatly reduced. Finally, the effectiveness of the proposed method is evaluated using a numerical example and the Tennessee Eastman process.

Keywords： Semi-supervised     Active learning     Ensemble learning     Mixture discriminant analysis     Fault classification    

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Semi-industrial Tests of Pressure Leaching on High-iron Sphalerite Concentrate

Wang Jikun,Zhou Tingxi,Wu Jinmei

Strategic Study of CAE 2005, Volume 7, Issue 1,   Pages 60-64

Abstract:

High-iron sphalerite was subjected to two-stage pressure leaching. The leaching rate of zinc and iron was 97.09 % and 15.2 % respectively. The yield of elemental sulphur was 93 % . The residual acid in the leachate was 3.95 g/L. By easy neutralization and purification, zinc sulphate solution was obtained, which would be sent to the zinc electrowinning operation. For the purpose of comparison, one-stage pressure leaching on average sphalerite was conducted. Leaching rate of zinc and iron was 98.09 % and 37.88 % respectively, and the yield of elemental sulphur was 96 % . The leachate with higher acid content (46.4 g/L) could be integrated into the existing traditional hydrometallurgical process of zinc

Keywords： high-iron sphalerite     pressure leaching     semi-industrial tests     elemental sulphur    

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Three cases of different types of oblique vaginal septum syndrome with pregnancy

Chen Xiujuan,Xiong Xiumei and Lin Yuan

Strategic Study of CAE 2014, Volume 16, Issue 5,   Pages 90-95

Abstract:

Burgis et al. reported the incidence of oblique vaginal septum syndrome (OVSS ) is 0.1 %～3.8 %. There are 3 types，and different types of OVSS have different clinical presentations.Induced abortion is hard for patients of OVSS with pregnancy，because of their complex reproductive tract anomalies. This article reported 3 types OVSS with unwanted pregnancy，1 case of each type. Through these cases，we can draw a conclusion that the diagnois and treatment of these patients are difficult，it tends to be ignored and easily misdiagnosed. So clinicians and sonographers should raise awareness of this kind of Müllerian duct anomalies；it is important to diagnose exactly and cure correctly.

Keywords： oblique vaginal septum syndrome     pregnancy     ultrasound     treatment    

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TC Assurance Architecture for Cybersecurity Infrastructure Based on Active Defense

Zhang Dawei,Shen Changxiang, Liu Jiqiang, Zhang Feifei, Li Lun, Cheng Lichen

Strategic Study of CAE 2016, Volume 18, Issue 6,   Pages 58-61 doi: 10.15302/J-SSCAE-2016.06.012

Abstract:

This paper introduces the status, problems, and future strategies of the cyberspace security infrastructure system, and proposes that cyberspace security infrastructure must be based on active defense. Therefore, this paper proposes several suggestions for a trusted technology insurance system, which include the following: In order to build a trusted technology insurance system, independent innovation in active defense must be the breaking point; key information security systems must be developed by local institutions; independent innovation must be increased; research, product development, and active defense applications must be promoted; the development of trusted computing standards must be promoted; and experimental demonstrations must be carried out.

Keywords： active defense     active immunity     trusted computing     trusted technology insurance system     cybersecurity infrastructure    

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Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

Strategic Study of CAE 2005, Volume 7, Issue 12,   Pages 61-68

Abstract:

As the aim of improving the utilization ratio of SMAs in SMA-rubber seismic isolation bearings, several different SMA-rubber seismic isolation bearings were designed, and energy dissipation experiments were done. The factors which affect the level stiffness, energy dissipation and equivalent damping ratio of SMA-rubber seismic isolation bearings including level displacement amplitude, level loading frequency and vertical load were studied. Result showed that the new SMA-rubber seismic isolation bearings have better hysteresis and energy dissipation capabilities. It provided the base to optimize the SMA-rubber seismic isolation bearings.

Keywords： shape memory alloy     seismic isolation bearings     initial stiffness     hysteresis energy dissipation     equivalent damping ratio    

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Model and algorithm for satellite’s active temperature control loop design

Li Yunze,Yang Juan,Ning Xianwen,Wang Xiaoming,Shi Xiaobo

Strategic Study of CAE 2008, Volume 10, Issue 7,   Pages 48-50

Abstract:

Electrical heater is an important type of active thermal control methods. A dynamical equation of its control object's transient temperature change is established through principle analysis. The heating power demand calculation models at different temperature control models have been developed from the dynamical equation. The calculating flow of electrical heater's heat power has also been introduced. An active heating loop design example, which is included at the end of this paper, shows that the equations developed above can be used conveniently in satellite's active thermal control system designing and calculating.

Keywords： satellite     active thermal control     active temperature control loop     model and algorithm    

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Emergy evaluation of Cynoglossus semilaevis Günther in industrial recirculating aquaculture

Wang Feng and Lei Jilin

Strategic Study of CAE 2015, Volume 17, Issue 1,   Pages 4-10

Abstract:

In order to preferably evaluate breeding effect and environmental sustainability of recirculating aquaculture mode， the emergy flow chart of Cynoglossus semilaevis Günther in industrial recirculating aquaculture was built to analyze the emergy of different parts in the aquaculture mode. The results showed that： The environment emergy input occupied only 1.08 %， emergy yield ratio (EYR) was 2.433， emergy loading ratio (ELR) was 0.313 4， and emergy sustainable index (ESI) was 7.763， indicating that agricultural production was promoted to the level of industrialization with the use of this kind of aquaculture mode， which gains highly developed economic system and higher production efficiency； meanwhile， this kind of aquaculture mode greatly alleviates the pressure of environment and gains higher sustainability and carrying capacity.

Keywords： Cynoglossus semilaevis Günther     recirculating aquaculture     aquaculture mode     environmental sustainability     emergy    

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Seismic input of NPP & topic of seismic-isolated research for AP1000 nuclear island

Xia Zufeng

Strategic Study of CAE 2013, Volume 15, Issue 4,   Pages 52-56

Abstract:

The article introduces seismic input of nuclear power plant in the world briefly, and mentions some exploratory work for seismic-isolated foundation of nuclear island in France, Japan and China. The article mainly focuses on a general concept design of nuclear island seismic-isolated foundation for AP1000 units by our institute. There are more useful information for seismic input of nuclear power plant & seismic-isolated foundation of nuclear island as a reference.

Keywords： nuclear power plant     seismic design     AP1000     seismic-isolated foundation    

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The earthquake threat and countermeasures to the safety of nuclear power plants

Zhou Fulin,Tan Ping,Liu Dewen

Strategic Study of CAE 2013, Volume 15, Issue 4,   Pages 36-40

Abstract:

Nuclear energy is a carbon-free,  clean and efficient energy. It is very important in the progress of human civilization and modern development of the world. However,  there are still some problems such as nuclear leak and nuclear waste. In this paper,  the world's nuclear energy utilization and nuclear power plant constructions are reviewed and plans are forecasted. The basic reason of previous nuclear power plant accidents in history is summarized. Taking 2011 Tohuku earthquake -fukushima nuclear power station accident as an example, threats to the nuclear power plant by earthquake are investigated and impacts on social,  economic and ecological environment caused by nuclear power station accident are analyzed. This paper drew lessons from previous accidents and put forward a variety of countermeasures which are from both the technical and management aspects. This paper also put forward some suggestions. Security measures of the existing nuclear power plants should be assessed carefully. The long-term construction plan of the nuclear power plant should be improved. In addition,  emergency management mechanism of the nuclear power plant can be enhanced in the future. The earthquake monitoring and earthquake early-warning system is critical and promoted to be established widely. The nuclear probability safety analysis (PSA) could be investigated in depth. The security education of the public should be continuously popularized and disaster drills be carried out regularly. International cooperation and communication are also advocated to be strengthened. All these measures can be significant in human process to explore nuclear energy correctly. We also appeal people all over the world to respect the nature,  enjoy the nature,  and to create and enjoy the new civilization of human beings.

Keywords： nuclear power plant     seismic hazard     tsunami     location safety     base isolation     energy dissipation     three-dimensional base isolation    

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Agricultural water saving potential and feasibility analysis of implementing semiarid agriculture in Henan Province

Huang Xiuqiao and Wang Jinglei

Strategic Study of CAE 2012, Volume 14, Issue 3,   Pages 46-53

Abstract:

Based on collecting the data of utilization status of water resources and water-saving agricultural development in Henan Province, and considering the effects of engineering measures, agronomic practices and management measures etc., the water-saving potential in different hydrological years and a feasibility of implementing semi-arid agriculture in Henan Province were analyzed. Finally, the specific technical measures to develop semiarid agriculture in different subareas of Henan Province were put forward

Keywords： water saving potential     semi-arid agriculture     Henan Province    

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Achievement of agricultural water saving and feasibility of developing semi arid agriculture in Shandong Province

Du Zhendong and Huang Qian

Strategic Study of CAE 2012, Volume 14, Issue 3,   Pages 54-58

Abstract:

Based on the analysis of status of water resources and achievement of agricultural water-saving development in Shandong Province, the feasibility of developing semi-arid agriculture was investigated with combination of the irrigation experimental results in national “863” project.

Keywords： semi-arid     Shandong Province     agricultural water-saving    

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Research on Active Handoff Mechanism in Micro-Mobility Protocols

Zhao Aqun

Strategic Study of CAE 2004, Volume 6, Issue 8,   Pages 50-56

Abstract:

Aiming at the disadvantages of current handoff mechanisms in micro-mobility protocols, active handoff mechanism is proposed. This mechanism takes advantage of mobility prediction technique to predict the next cell a mobile host will handoff to and the handoff time before the handoff really happens and establish the new path for the mobile host in advance. To guarantee the implementation of active handoff mechanism, a mobility prediction algorithm is proposed which is suitable for active handoff mechanism and easy to implement. Meanwhile the methods to avoid packet loss and packet duplication in active handoff procedure are proposed. The performance of active handoff mechanism is evaluated through theoretical analysis and system simulation. The result shows that active handoff mechanism obtains considerable performance improvement with less cost.

Keywords： micro-mobility protocols     active handoff mechanism     mobility prediction     performance evaluation    

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Learning to select pseudo labels: a semi-supervised method for named entity recognition Research Articles

Zhen-zhen Li, Da-wei Feng, Dong-sheng Li, Xi-cheng Lu,lizhenzhen14@nudt.edu.cn,davyfeng.c@gmail.com,dsli@nudt.edu.cn,xclu@nudt.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 6,   Pages 809-962 doi: 10.1631/FITEE.1800743

Abstract: models have achieved state-of-the-art performance in (NER); the good performance, however, relies heavily on substantial amounts of labeled data. In some specific areas such as medical, financial, and military domains, labeled data is very scarce, while is readily available. Previous studies have used to enrich word representations, but a large amount of entity information in is neglected, which may be beneficial to the NER task. In this study, we propose a for NER tasks, which learns to create high-quality labeled data by applying a pre-trained module to filter out erroneous pseudo labels. Pseudo labels are automatically generated for and used as if they were true labels. Our semi-supervised framework includes three steps: constructing an optimal single neural model for a specific NER task, learning a module that evaluates pseudo labels, and creating new labeled data and improving the NER model iteratively. Experimental results on two English NER tasks and one Chinese clinical NER task demonstrate that our method further improves the performance of the best single neural model. Even when we use only pre-trained static word embeddings and do not rely on any external knowledge, our method achieves comparable performance to those state-of-the-art models on the CoNLL-2003 and OntoNotes 5.0 English NER tasks.

Keywords： 命名实体识别；无标注数据；深度学习；半监督学习方法    

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Title Author Date Type Operation

An adjustable anti-resonance frequency controller for a dual-stage actuation semi-active vibration isolation system

Bo Zhao, Weijia Shi, Bingquan Wang, Jiubin Tan,shiweijia@hit.edu.cn

Journal Article

Study on Semi-active Control of Multi-dim Damping Platform Based on Parallel Mechanism and MR Damper

Zhu Wei,Ma Lüzhong,Chen Xiuxiang,Wu Weiguang,Xie Jun

Journal Article

Ensemble enhanced active learning mixture discriminant analysis model and its application for semi-supervised fault classification

Weijun WANG, Yun WANG, Jun WANG, Xinyun FANG, Yuchen HE

Journal Article

Semi-industrial Tests of Pressure Leaching on High-iron Sphalerite Concentrate

Wang Jikun,Zhou Tingxi,Wu Jinmei

Journal Article

Three cases of different types of oblique vaginal septum syndrome with pregnancy

Chen Xiujuan,Xiong Xiumei and Lin Yuan

Journal Article

TC Assurance Architecture for Cybersecurity Infrastructure Based on Active Defense

Zhang Dawei,Shen Changxiang, Liu Jiqiang, Zhang Feifei, Li Lun, Cheng Lichen

Journal Article

Dynamical Experiment Research on New Seismic Isolation Bearings with SMA Wires

Deng Zongcai,Sun Hongjun,Liu Chunguo,Niu Kun,Deng Hongliang

Journal Article

Model and algorithm for satellite’s active temperature control loop design

Li Yunze,Yang Juan,Ning Xianwen,Wang Xiaoming,Shi Xiaobo

Journal Article

Emergy evaluation of Cynoglossus semilaevis Günther in industrial recirculating aquaculture

Wang Feng and Lei Jilin

Journal Article

Seismic input of NPP & topic of seismic-isolated research for AP1000 nuclear island

Xia Zufeng

Journal Article

The earthquake threat and countermeasures to the safety of nuclear power plants

Zhou Fulin,Tan Ping,Liu Dewen

Journal Article

Agricultural water saving potential and feasibility analysis of implementing semiarid agriculture in Henan Province

Huang Xiuqiao and Wang Jinglei

Journal Article

Achievement of agricultural water saving and feasibility of developing semi arid agriculture in Shandong Province

Du Zhendong and Huang Qian

Journal Article

Research on Active Handoff Mechanism in Micro-Mobility Protocols

Zhao Aqun

Journal Article

Learning to select pseudo labels: a semi-supervised method for named entity recognition

Zhen-zhen Li, Da-wei Feng, Dong-sheng Li, Xi-cheng Lu,lizhenzhen14@nudt.edu.cn,davyfeng.c@gmail.com,dsli@nudt.edu.cn,xclu@nudt.edu.cn

Journal Article