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Optimal communication frequency for switching cabled ocean networks with commands carried over the power line Research Article

Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 10,   Pages 1331-1343 doi: 10.1631/FITEE.1900125

Abstract: s with tree or ring topologies play an important role in real-time ocean exploration. Due to the time-consuming need for field maintenance, technology that can actively switch the power on/off on certain branches of the network becomes essential for enhancing the reliability and availability of the network. In this paper, a novel switching-control method is proposed, in which we invert the power transmission polarity and use the current on the power line as the digital signal at low frequency to broadcast information with the address and commands to the network, and the corresponding (BU) can decode and execute the switching commands. The cable’s parasitic parameters, the network scale, and the number of BUs, as the influencing factors of the on the power line, are theoretically studied and simulated. An optimized frequency that balances the executing accuracy and rate is calculated and proved on a simulated prototype. The results showed that the technology with optimized frequency can enhance the switching accuracy and configuring rate.

Keywords： 海缆开断；海洋观测网；分支单元；传输线理论；通信频率    

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Texture branch network for chronic kidney disease screening based on ultrasound images Research Articles

Peng-yi Hao, Zhen-yu Xu, Shu-yuan Tian, Fu-li Wu, Wei Chen, Jian Wu, Xiao-nan Luo,fuliwu@zjut.edu.cn

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 8,   Pages 1119-1266 doi: 10.1631/FITEE.1900210

Abstract: (CKD) is a widespread renal disease throughout the world. Once it develops to the advanced stage, serious complications and high risk of death will follow. Hence, early screening is crucial for the treatment of CKD. Since ultrasonography has no side effects and enables radiologists to dynamically observe the morphology and pathological features of the kidney, it is commonly used for kidney examination. In this study, we propose a novel convolutional neural network (CNN) framework named the to screen CKD based on images. This introduces a texture branch into a typical CNN to extract and optimize texture features. The model can automatically generate texture features and deep features from input images, and use the fused information as the basis of classification. Furthermore, we train the base part of the network by means of , and conduct experiments on a dataset with 226 images. Experimental results demonstrate the effectiveness of the proposed approach, achieving an accuracy of 96.01% and a sensitivity of 99.44%.

Keywords： 慢性肾脏病；超声；纹理分支网络；迁移学习    

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A New Subdiscipline of Contemporary Optics—Aero-optics

Yin Xingliang

Strategic Study of CAE 2005, Volume 7, Issue 12,   Pages 1-6

Abstract:

Based on developing process of aero-optics, the background of the subject is introduced. The definition, intension, research object, research methods of the subject are proposed. The research contents are described, which include mechanism, calibration methods, calibration tests for aero-optic effects and optic window of the hypersonic aircraft. The theoretical research, engineering modeling, testing principle and testing methods in China are described in detail. Some representative results are given. At last, the application prospects and research tendency of the subject are suggested.

Keywords： aerodynamics     turbulent flows     optics     aero-optics    

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Research on an intelligent device for releasing main cable strand of suspension bridge in horizontal direction

Shen Wang,Yu Jianqun,Gu Qinghua,Mao Youda

Strategic Study of CAE 2010, Volume 12, Issue 7,   Pages 4-7

Abstract:

The design principle, installation and test of a passive automatic cable releasing device were described. It is based on horizontal retractable technology and used for releasing main cable strand of suspension bridge. The release quality of main cable strand was greatly improved after the adoption of the device.

Keywords： suspension bridge     main cable strand     intelligent     cable releasing device    

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Cell-Zone Method: An Engineering Approach to Predict Smoke Movement in Large Scale Building Fire

Hu Longhua,Huo Ran,Liy Uanzhou,Wang Haobo

Strategic Study of CAE 2003, Volume 5, Issue 8,   Pages 59-63

Abstract:

In large scale building fire, it is improper to predict smoke descending using traditional simple two-layer zone model, which divides the total space of the building into upper hot smoke layer and lower cool air layer. In this paper, an improved method, named Cell-Zone Method, is used to solve this problem, which first divides the total space into some small subspaces and then uses traditional two-layer zone model in each subspace. Comparison is carried out between these two methods in fire smoke development simulation in typical large space buildings by CFAST4.02 software package. Results show that Cell-Zone Method demonstrates more applicability than traditional simple two-layer zone model in large scale building, especially in buildings having large scale in one direction.

Keywords： large scale building     smoke movement     cell-zone method     zone-model    

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Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission to a ring of multiple radio access units None

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Frontiers of Information Technology & Electronic Engineering 2019, Volume 20, Issue 2,   Pages 300-306 doi: 10.1631/FITEE.1700056

Abstract:

A radio-over-fiber (RoF) distributed antenna system (DAS) architecture is proposed, where millimeter wave (mm-wave) signals are transmitted to four different radio access units (RAUs) arranged in a ring topology. The proposed architecture transmits duplex data of 128 Mb/s to each RAU in both downlink (DL) and uplink (UL) directions. The radio frequency (RF) signals are transmitted by polarization multiplexing a multi-wavelength source. Millimeter-wave signals at a frequency of 25 GHz are generated at each RAU using remote heterodyne detection. The proposed architecture provides increased coverage while maintaining good bit error rate (BER) results.

Keywords： Radio over fiber     Millimeter wave     Radio access units    

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Study and application of the technology on water quality target management for control unit

Lei Kun,Qiao Fei,Fu Guo and Su Baolin

Strategic Study of CAE 2013, Volume 15, Issue 3,   Pages 62-69

Abstract:

Based on the domestic and overseas research of watershed environment management techniques,the technology system of water quality target management for the control units was presented and the connotations and characteristics were discussed in this paper. Meanwhile, seven key techniques of the system, including the division of control units, environmental problem diagnosis, identifying of water quality objectives, construction of water quality models which is used to establish the response relationship between water quality and pollutant input, pollutant load allocation, pollutant emission reduction program, and pollutant load monitoring and evaluation are introduced. As a case study, the technology system of water quality target management for the control units was applied in Nansha River in Liaohe River basin successfully, and the total load allocation program was given, which can be used to provide technical support for the local water environment management.

Keywords： control unit     water quality target management     pollutants allocation     Nansha River    

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An energy-efficient reconfigurable asymmetric modular cryptographic operation unit for RSA and ECC Research Article

Mengni BIE, Wei LI, Tao CHEN, Longmei NAN, Danyang YANG,raspberry0213@126.com,liwei12@fudan.edu.cn

Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 1,   Pages 134-144 doi: 10.1631/FITEE.2000325

Abstract: RSA and ellipse curve cryptography (ECC) algorithms are widely used in authentication, data security, and access control. In this paper, we analyze the basic operation of the ECC and RSA algorithms and optimize their modular multiplication and modular inversion algorithms. We then propose a modular operation architecture, with a mix-memory unit and double multiply-accumulate structures, to realize our unified, asymmetric cryptosystem structure in an operational unit. Synthesized with 55-nm CMOS process, our design runs at 588 MHz and requires only 437 801 μm of hardware resources. Our proposed design takes 21.92 and 23.36 mW for 2048-bit RSA modular multiplication and modular inversion respectively, as well as 16.16 and 15.88 mW to complete 512-bit ECC dual-field modular multiplication and modular inversion respectively. It is more energy-efficient and flexible than existing single algorithm units. Compared with existing multiple algorithm units, our proposed method shows better performance. The operation unit is embedded in a 64-bit RISC-V processor, realizing key generation, encryption and decryption, and digital signature functions of both RSA and ECC. Our proposed design takes 0.224 and 0.153 ms for 256-bit ECC point multiplication in and respectively, as well as 0.96 ms to complete 1024-bit RSA exponentiation, meeting the demand for .

Keywords： Modular operation unit     Reconfigurable     High energy efficiency    

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A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands Research Articles

Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 8,   Pages 1104-1113 doi: 10.1631/FITEE.2000229

Abstract: This paper presents a study of s in submillimeter and terahertz bands. To show the necessity of improving the mechanical properties of the coupler’s branch in submillimeter and terahertz bands, a comprehensive study regarding the displacement of hybrid branch variation with varying width-length ratio and height-length ratio has been completed. In addition, a modified is designed and presented. Compared with the traditional branch structure, the proposed hybrid consists of a modified middle branch with circular cutouts at the top and bottom on both sides instead of the traditional rectangle branch, which increases the branch size and improves its while achieving the same performance. Simulation results show that the deformation of the modified hybrid branch is 22% less than those of other traditional structure designs under the same stress. In practice, a vibration experiment is set up to verify the of hybrid couplers. Measurement results show that the experiment deteriorates the coupling performance. Experimental results verify that the performance of the novel structure coupler is better than that of a traditional structure branch hybrid coupler under the same electrical properties.

Keywords： 定向耦合器；3-dB分支波导定向耦合器；亚毫米波器件；太赫兹电路；机械可靠性    

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Research on the transport technology of coiled main cable strands with super length and large size

Lu Jianfeng,Gu Qinghua,Zhang Hailiang,Shen Wang,Zhou Song

Strategic Study of CAE 2010, Volume 12, Issue 7,   Pages 13-17

Abstract:

 The transport technology of coiled main cable strands with super length and large size was introduced in this paper on the basis of two examples.One is the main cable strands transport of Xihoumen Bridge which is a steel structure suspension bridge with the span of 1 650 m; the other is the main cable strand with the size of Ø5 ×169 wire ×4 250 m and the weight of 120 t.

Keywords： super long     large size     cable strand     coiled cable strand     transport    

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Forecasting traffic flows in irregular regions with multi-graph convolutional network and gated recurrent unit Research Articles

Dewen Seng, Fanshun Lv, Ziyi Liang, Xiaoying Shi, Qiming Fang,sengdw@hdu.edu.cn,172050041@hdu.edu.cn,liangziyi2020@163.com,shixiaoying@hdu.edu.cn,fangqiming@hdu.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 9,   Pages 1179-1193 doi: 10.1631/FITEE.2000243

Abstract: The prediction of regional traffic flows is important for traffic control and management in an intelligent traffic system. With the help of deep neural networks, the convolutional neural network or residual neural network, which can be applied only to regular grids, is adopted to capture the spatial dependence for flow prediction. However, the obtained regions are always irregular considering the road network and administrative boundaries; thus, dividing the city into grids is inaccurate for prediction. In this paper, we propose a new model based on and (MGCN-GRU) to predict traffic flows for . Specifically, we first construct heterogeneous inter-region graphs for a city to reflect the relationships among regions. In each graph, nodes represent the and edges represent the relationship types between regions. Then, we propose a to fuse different inter-region graphs and additional attributes. The GRU is further used to capture the temporal dependence and to predict future traffic flows. Experimental results based on three real-world large-scale datasets (public bicycle system dataset, taxi dataset, and dockless bike-sharing dataset) show that our MGCN-GRU model outperforms a variety of existing methods.

Keywords： 交通流量预测；多图卷积网络；门控循环单元；不规则区域    

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A Review on the Research and Application of DEA

Li Meijuan,Chen Guohong

Strategic Study of CAE 2003, Volume 5, Issue 6,   Pages 88-94

Abstract:

This paper first presents basic ideas, models and application steps for data envelopment analysis (DEA), then summarizes the development and main application fields of DEA as well as some main research results achieved during the past twenty years in these fields. Finally, the directions for future research are discussed.

Keywords： DEA     DMU     relative effectiveness     the directions for future research    

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The Balancing Stress in the Tilted Section of the Element Is Not the Stress for the Balance of the Particle on It

HanWenba,Cai Bingqing,LiuDabin,Han Xiaodong

Strategic Study of CAE 2005, Volume 7, Issue 11,   Pages 42-47

Abstract:

From the pure extension of the straight bar it can be seen that the balancing stress in the tilted section of the element can only ensure the balance of itself, but can’t ensure the balance of particles on it. The difference between the balance of the element and that of particles on it is demonstrated. A conclusion is drawn that the balancing stress of particles under two dimension stress state is written as σ＇α = σ2x +σ2y+ 2τ2+2τ（σ2x+σ2y）1/2(sinα2 + cosα2))1/2，and the angle between the direction of the balance stress and axis is written as αx= arctan ( τ + (σ2x + σ2y)1/2 sin arctan （σy/σx)) /（τ + （σ2x+σ2y）1/2 cos arctan (σy/σx)). Under two dimension stress state, the principal stress of element and the maximum balancing stress of particles both take place in the 45°diagonal plane, and the balancing stress of particles is 21/2 times that of the principal stress. A new two dimension combining strength condition is derived as σ＇α = (σ2 + 2τ2 + 2στ )1/2≤[σ], and it will replace the formula of bend-torsion combining strength condition of third strength theory ( σ2 + 4τ2)1/2≤[σ] and that of fourth strength theory( σ2 + 3τ2)1/2≤[σ]. A new three dimension combining strength condition is derived as σ＇d =(σ21+σ22+σ23)1/2[σ]and can replace the wrong formula σxd=[((σ1 -σ2)2 +(σ2-σ3)2 +(σ3-σ1)2)/2 ]1/2≤[σ] , which is the corresponding strength formula of the fourth strength theory.

Keywords： stress     tilted section     balance stress of particle     strength theory    

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The Finite Element Analysis of Upper Bearing Box for AGC Reformation of a 2300 mm Mill

Wang Huachuan,Wang Ailing

Strategic Study of CAE 2001, Volume 3, Issue 1,   Pages 83-84

Abstract:

The reformation of upper bearing box in AGC system is described, its strength is checked by using FEA and the best result is provided.

Keywords： mill reformation     finite element analysis (FEA)     sevo-cylinder    

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Overall process design of herringbone steel pylon

Ji Lin,Zhang Yongli

Strategic Study of CAE 2010, Volume 12, Issue 4,   Pages 43-47

Abstract:

The central tower of Taizhou Bridge adopts the vertical steel tower structure for the first time in the world and its manufacturing and installation are also difficult. Through targeted analysis in the steel-concrete composite section, the integral segment, the lower link segment and different structural forms of the steel tower, we propose different manufacturing programs for different segments, and the application to Taizhou Bridge will provide references and technical support for using high-strength steel plate and manufacturing of the steel tower with complex structural forms.

Keywords： plate element     block     segment     steel tower     technology design    

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Title Author Date Type Operation

Optimal communication frequency for switching cabled ocean networks with commands carried over the power line

Yan-hu Chen, Yu-jia Zang, Jia-jie Yao, Gul Muhammad,yanhuchen@zju.edu.cn

Journal Article

Texture branch network for chronic kidney disease screening based on ultrasound images

Peng-yi Hao, Zhen-yu Xu, Shu-yuan Tian, Fu-li Wu, Wei Chen, Jian Wu, Xiao-nan Luo,fuliwu@zjut.edu.cn

Journal Article

A New Subdiscipline of Contemporary Optics—Aero-optics

Yin Xingliang

Journal Article

Research on an intelligent device for releasing main cable strand of suspension bridge in horizontal direction

Shen Wang,Yu Jianqun,Gu Qinghua,Mao Youda

Journal Article

Cell-Zone Method: An Engineering Approach to Predict Smoke Movement in Large Scale Building Fire

Hu Longhua,Huo Ran,Liy Uanzhou,Wang Haobo

Journal Article

Polarizationmultiplexing based duplex radio-over-fiber link for millimeterwave signal transmission to a ring of multiple radio access units

Tayyab MEHMOOD, Hina QAYYUM, Salman GHAFOOR

Journal Article

Study and application of the technology on water quality target management for control unit

Lei Kun,Qiao Fei,Fu Guo and Su Baolin

Journal Article

An energy-efficient reconfigurable asymmetric modular cryptographic operation unit for RSA and ECC

Mengni BIE, Wei LI, Tao CHEN, Longmei NAN, Danyang YANG,raspberry0213@126.com,liwei12@fudan.edu.cn

Journal Article

A mechanical reliability study of 3-dB waveguide hybrid couplers in submillimeter and terahertz bands

Zhongqian Niu, Bo Zhang, Daotong Li, Dongfeng Ji, Yang Liu, Yinian Feng, Tianchi Zhou, Yaohui Zhang, Yong Fan,zhangbouestc@yeah.net

Journal Article

Research on the transport technology of coiled main cable strands with super length and large size

Lu Jianfeng,Gu Qinghua,Zhang Hailiang,Shen Wang,Zhou Song

Journal Article

Forecasting traffic flows in irregular regions with multi-graph convolutional network and gated recurrent unit

Dewen Seng, Fanshun Lv, Ziyi Liang, Xiaoying Shi, Qiming Fang,sengdw@hdu.edu.cn,172050041@hdu.edu.cn,liangziyi2020@163.com,shixiaoying@hdu.edu.cn,fangqiming@hdu.edu.cn

Journal Article

A Review on the Research and Application of DEA

Li Meijuan,Chen Guohong

Journal Article

The Balancing Stress in the Tilted Section of the Element Is Not the Stress for the Balance of the Particle on It

HanWenba,Cai Bingqing,LiuDabin,Han Xiaodong

Journal Article

The Finite Element Analysis of Upper Bearing Box for AGC Reformation of a 2300 mm Mill

Wang Huachuan,Wang Ailing

Journal Article

Overall process design of herringbone steel pylon

Ji Lin,Zhang Yongli

Journal Article