Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819313
A. Antonopoulos, C. Verikoukis
In the Internet of Things (IoT) context, the massive proliferation of wireless devices implies dense networks that require cooperation for the multihop transmission of the sensor data to central units. The altruistic user behavior and the isolation of malicious users are fundamental requirements for the proper operation of any cooperative network. However, the introduction of new communication techniques that improve the cooperative performance (e.g., network coding) hinders the application of traditional schemes on malicious users detection, which are mainly based on packet overhearing. In this paper, we introduce a non-parametric statistical approach, based on the Kruskal-Wallis method, for the detection of user misbehavior in network coding scenarios. The proposed method is shown to effectively handle attacks in the network, even when malicious users adopt a smart probabilistic misbehavior.
{"title":"Misbehavior detection in the Internet of Things: A network-coding-aware statistical approach","authors":"A. Antonopoulos, C. Verikoukis","doi":"10.1109/INDIN.2016.7819313","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819313","url":null,"abstract":"In the Internet of Things (IoT) context, the massive proliferation of wireless devices implies dense networks that require cooperation for the multihop transmission of the sensor data to central units. The altruistic user behavior and the isolation of malicious users are fundamental requirements for the proper operation of any cooperative network. However, the introduction of new communication techniques that improve the cooperative performance (e.g., network coding) hinders the application of traditional schemes on malicious users detection, which are mainly based on packet overhearing. In this paper, we introduce a non-parametric statistical approach, based on the Kruskal-Wallis method, for the detection of user misbehavior in network coding scenarios. The proposed method is shown to effectively handle attacks in the network, even when malicious users adopt a smart probabilistic misbehavior.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116877564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819266
Shuang Wang, Zhengqi Li, Haijun Zhang, Yuzhu Ji, Yan Li
Vehicle type recognition has many applications in video surveillance, urban traffic management and automatic driving. This paper presents a new vehicle type recognition method using feature encoding combined with Convolutional Neural Network (CNN). This method uses the CNN to learn the properties of the high-level image features. It is able to largely compensate the information loss if we use feature encoding solely. By contrast, to achieve satisfactory classification results, feature encoding algorithms do not need a large number of training samples. Thus, it can help CNN reduce the number of training samples. Therefore, we propose a hybrid algorithm by integrating method on vehicle type recognition in comparison to CNN, feature encoding algorithms and other competitive methods.
{"title":"Classifying vehicles with convolutional neural network and feature encoding","authors":"Shuang Wang, Zhengqi Li, Haijun Zhang, Yuzhu Ji, Yan Li","doi":"10.1109/INDIN.2016.7819266","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819266","url":null,"abstract":"Vehicle type recognition has many applications in video surveillance, urban traffic management and automatic driving. This paper presents a new vehicle type recognition method using feature encoding combined with Convolutional Neural Network (CNN). This method uses the CNN to learn the properties of the high-level image features. It is able to largely compensate the information loss if we use feature encoding solely. By contrast, to achieve satisfactory classification results, feature encoding algorithms do not need a large number of training samples. Thus, it can help CNN reduce the number of training samples. Therefore, we propose a hybrid algorithm by integrating method on vehicle type recognition in comparison to CNN, feature encoding algorithms and other competitive methods.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115464761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819188
Haitham Elfaham, Florian Palm, Sten Grüner, U. Epple
Integrating control development phases requires a consolidated communication architecture. Currently, different communication protocols are used at the different development stages preventing a fully integrated solution to exist. We propose an approach using a unified communication protocol to jointly integrate the control development stages. MATLAB and Simulink were connected to a programmable logic controller successfully resulting in a fully integrated control development chain and opening the doors for further development in other potential areas.
{"title":"Full integration of MATLAB/Simulink with control application development using OPC unified architecture","authors":"Haitham Elfaham, Florian Palm, Sten Grüner, U. Epple","doi":"10.1109/INDIN.2016.7819188","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819188","url":null,"abstract":"Integrating control development phases requires a consolidated communication architecture. Currently, different communication protocols are used at the different development stages preventing a fully integrated solution to exist. We propose an approach using a unified communication protocol to jointly integrate the control development stages. MATLAB and Simulink were connected to a programmable logic controller successfully resulting in a fully integrated control development chain and opening the doors for further development in other potential areas.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124901524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819178
Emre Sezgin
There is an increasing demand to cloud services in the market. In terms of cost and benefit, it is obvious that cloud services lowered investment cost and fixed cost for businesses. Thus, an economic perspective towards cloud services is required for strategic decisions. In this paper, a preliminary evaluation of cloud services was presented, and the common economic issues were identified. Regarding to these issues, the latency was addressed from the economic perspective, and a testing environment was created and implemented in 5 different cases. The results were given in the paper outlining impact of latency in terms of concurrent users and bandwidth allocation. Finally, an alternative cost estimation was proposed.
{"title":"Assessment of cloud services: An economic perspective","authors":"Emre Sezgin","doi":"10.1109/INDIN.2016.7819178","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819178","url":null,"abstract":"There is an increasing demand to cloud services in the market. In terms of cost and benefit, it is obvious that cloud services lowered investment cost and fixed cost for businesses. Thus, an economic perspective towards cloud services is required for strategic decisions. In this paper, a preliminary evaluation of cloud services was presented, and the common economic issues were identified. Regarding to these issues, the latency was addressed from the economic perspective, and a testing environment was created and implemented in 5 different cases. The results were given in the paper outlining impact of latency in terms of concurrent users and bandwidth allocation. Finally, an alternative cost estimation was proposed.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125890560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819267
Wei Huang, Xiaolong Deng, Yuzhu Ji, Shengyong Chen
Since most distributed estimation algorithms only try to achieve high estimation precision while ignoring the positive-negative problem of components in the true parameter, estimation using these methods may be physically absurd and uninterpretable. In order to avoid erroneous results, we need to add a nonnegative constraint on the parameter to be estimated. In this paper, we propose a novel distributed diffusion nonnegative LMS algorithm with regularization for estimating some specific parameter. The algorithm keeps the non-negativity of all components in the parameter in the adaptation process. Simulations results illustrate the advantage of our algorithm in the low steady MSD level and high convergence rate.
{"title":"Distributed diffusion nonnegative LMS algorithm over sensor networks","authors":"Wei Huang, Xiaolong Deng, Yuzhu Ji, Shengyong Chen","doi":"10.1109/INDIN.2016.7819267","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819267","url":null,"abstract":"Since most distributed estimation algorithms only try to achieve high estimation precision while ignoring the positive-negative problem of components in the true parameter, estimation using these methods may be physically absurd and uninterpretable. In order to avoid erroneous results, we need to add a nonnegative constraint on the parameter to be estimated. In this paper, we propose a novel distributed diffusion nonnegative LMS algorithm with regularization for estimating some specific parameter. The algorithm keeps the non-negativity of all components in the parameter in the adaptation process. Simulations results illustrate the advantage of our algorithm in the low steady MSD level and high convergence rate.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129855945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819172
P. Nicolae, D. Popa
The most common reference current detection methods for shunt active power filters are optimized and compared in this article, theoretically and through experimental tests. One used discrete Fourier transform (DFT), d-q axes theory, p-q Instantaneous Reactive Power (IRP) theory and Sinusoidal Signal Integrators (SSI). MATLAB/Simulink software is used because it provides specialized tools in order to design, implement and simulate these algorithms. Afterward they are implemented in a real-time setup using a digital signal processor (DSP) based solution with dSPACE controller board. For the performance comparison one used criteria like total harmonic distortion (THD) and unbalance of detected fundamental current, run time for the DSP, settling time, transient performance and overshoot. This study contributes to the existing comparisons in specialized literature by testing the algorithms under distorted and non-symmetrical PCC voltages and may be useful for hardware implementations.
{"title":"Improvement of the controller algorithms for active power filters operating under distorted and unbalanced grid voltages","authors":"P. Nicolae, D. Popa","doi":"10.1109/INDIN.2016.7819172","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819172","url":null,"abstract":"The most common reference current detection methods for shunt active power filters are optimized and compared in this article, theoretically and through experimental tests. One used discrete Fourier transform (DFT), d-q axes theory, p-q Instantaneous Reactive Power (IRP) theory and Sinusoidal Signal Integrators (SSI). MATLAB/Simulink software is used because it provides specialized tools in order to design, implement and simulate these algorithms. Afterward they are implemented in a real-time setup using a digital signal processor (DSP) based solution with dSPACE controller board. For the performance comparison one used criteria like total harmonic distortion (THD) and unbalance of detected fundamental current, run time for the DSP, settling time, transient performance and overshoot. This study contributes to the existing comparisons in specialized literature by testing the algorithms under distorted and non-symmetrical PCC voltages and may be useful for hardware implementations.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121592428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819170
Khaled Itani, A. D. Bernardinis, Z. Khatir, A. Jammal, M. Oueidat
This paper presents the regenerative braking design control and simulation of a hybrid energy storage system (HESS) for an electric vehicle (EV). The EV is driven by two 30 kW permanent magnet synchronous motors. The HESS contains a Li-Ion battery and an Ultra-Capacitor (UC) sources. In extreme braking conditions, the UC should be able to recover all the power delivered by the motors. When the maximal state of charge of the UC is achieved, the energy will be then recuperated by the battery. The introduction of a braking resistor would help the system to respect the voltage and current constraints and to protect the battery. This paper will validate the combination of the designed controllers ensuring the switching between the storage and dissipative elements while respecting the electrical constraints of the overall system, in particular for critical braking conditions. A Simulink model will be developed and validated.
{"title":"Control strategy for extreme conditions regenerative braking of a hybrid energy storage system for an electric vehicle","authors":"Khaled Itani, A. D. Bernardinis, Z. Khatir, A. Jammal, M. Oueidat","doi":"10.1109/INDIN.2016.7819170","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819170","url":null,"abstract":"This paper presents the regenerative braking design control and simulation of a hybrid energy storage system (HESS) for an electric vehicle (EV). The EV is driven by two 30 kW permanent magnet synchronous motors. The HESS contains a Li-Ion battery and an Ultra-Capacitor (UC) sources. In extreme braking conditions, the UC should be able to recover all the power delivered by the motors. When the maximal state of charge of the UC is achieved, the energy will be then recuperated by the battery. The introduction of a braking resistor would help the system to respect the voltage and current constraints and to protect the battery. This paper will validate the combination of the designed controllers ensuring the switching between the storage and dissipative elements while respecting the electrical constraints of the overall system, in particular for critical braking conditions. A Simulink model will be developed and validated.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115790379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819307
Yi-hao Shen, K. Tsang, I. Triantis, Tony Chi Chung Lee
This paper introduces a high frequency Point-to-Point (PtP) Microwave Transmitter Module for Telemedicine for hospital(s). Such a telemedicine system links up remote communities from one building to another in hospital environment. The network configurations of the high frequency microwave system are illustrated in details. Key advantages such as high capacity, long propagation distance, and wide range of frequency bands are described. The high frequency PtP serves as a repeater so that paramedical staff or nurse(s) may receive data at appropriate time. Hence important tasks such as first aid, doctor's diagnosis and instructions to patients may be performed through the telemedicine system. This paper describes the design of a telemedicine system based on a high linearity Ku-band transmitter module that can improve the capacity (data rate) as well as increased the propagation distance. The module operates between 13 ∼ 15.5 GHz and achieves 25 dB of gain and 33 dBm of output power at 1dB gain compression. The third order intermodulation (IM3) is −41 dBc at 22 dBm Pout/tone, when the two-tone space is 600KMz at the high centre frequency of 15GHz.
{"title":"High frequency sensors for robust transmission in telemedicine system","authors":"Yi-hao Shen, K. Tsang, I. Triantis, Tony Chi Chung Lee","doi":"10.1109/INDIN.2016.7819307","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819307","url":null,"abstract":"This paper introduces a high frequency Point-to-Point (PtP) Microwave Transmitter Module for Telemedicine for hospital(s). Such a telemedicine system links up remote communities from one building to another in hospital environment. The network configurations of the high frequency microwave system are illustrated in details. Key advantages such as high capacity, long propagation distance, and wide range of frequency bands are described. The high frequency PtP serves as a repeater so that paramedical staff or nurse(s) may receive data at appropriate time. Hence important tasks such as first aid, doctor's diagnosis and instructions to patients may be performed through the telemedicine system. This paper describes the design of a telemedicine system based on a high linearity Ku-band transmitter module that can improve the capacity (data rate) as well as increased the propagation distance. The module operates between 13 ∼ 15.5 GHz and achieves 25 dB of gain and 33 dBm of output power at 1dB gain compression. The third order intermodulation (IM3) is −41 dBc at 22 dBm Pout/tone, when the two-tone space is 600KMz at the high centre frequency of 15GHz.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126662222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819326
J. Folmer, Carolin Schrufer, Julia Fuchs, Christian Vermum, B. Vogel‐Heuser
The avoidance of plant shutdowns is one of the highest priorities for plant operators (plant owners). Shutdowns are forced by abnormal situations, e.g. unexpected equipment faults such as valve or pump faults. Each unexpected fault can lead to hazardous situations within a plant. Pumps are already well analyzed compared to valves and also frequently used in process industry. In this paper a data-driven fault detection system for valves will be introduced. To gain additional knowledge about faults of specific equipment, big data technology is applied, based on a huge number of historical data for different valves. The paper introduces an approach in which data from different competitive companies operating several process plants are filtered, selected and combined with data from equipment manufacturers. The valve diagnosis system uses historical process data obtained across company borders using physical valve models to detect faults by comparing standardized flow coefficient determined by DIN IEC 60534-2-1.
{"title":"Data-driven valve diagnosis to increase the overall equipment effectiveness in process industry","authors":"J. Folmer, Carolin Schrufer, Julia Fuchs, Christian Vermum, B. Vogel‐Heuser","doi":"10.1109/INDIN.2016.7819326","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819326","url":null,"abstract":"The avoidance of plant shutdowns is one of the highest priorities for plant operators (plant owners). Shutdowns are forced by abnormal situations, e.g. unexpected equipment faults such as valve or pump faults. Each unexpected fault can lead to hazardous situations within a plant. Pumps are already well analyzed compared to valves and also frequently used in process industry. In this paper a data-driven fault detection system for valves will be introduced. To gain additional knowledge about faults of specific equipment, big data technology is applied, based on a huge number of historical data for different valves. The paper introduces an approach in which data from different competitive companies operating several process plants are filtered, selected and combined with data from equipment manufacturers. The valve diagnosis system uses historical process data obtained across company borders using physical valve models to detect faults by comparing standardized flow coefficient determined by DIN IEC 60534-2-1.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126092163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2016-07-01DOI: 10.1109/INDIN.2016.7819332
K. Gopalan
Audio sample bit modification for steganography and watermarking is a viable technique with a simple time domain procedure. While high bit index is needed for robustly carrying hidden data in the presence of noise and low level attacks, an indication of tampering or verification of authenticity of received audio can be ensured using a fragile watermark spread throughout the audio. In this paper, an audio watermarking procedure for hiding an imperceptible and fragile watermark using bit modification is presented. Altering or attacking the watermarked audio, simulated by adding Gaussian noise, showed that the watermark was lost at an SNR of no less than 100 dB for a noise-free speech from the TIMIT database or for a noisy audio from communication from an aircraft cockpit, even when the perceptual quality of the audio in both cases remained the same as the original audio.
{"title":"An algorithm for fragile audio watermarking by bit modification","authors":"K. Gopalan","doi":"10.1109/INDIN.2016.7819332","DOIUrl":"https://doi.org/10.1109/INDIN.2016.7819332","url":null,"abstract":"Audio sample bit modification for steganography and watermarking is a viable technique with a simple time domain procedure. While high bit index is needed for robustly carrying hidden data in the presence of noise and low level attacks, an indication of tampering or verification of authenticity of received audio can be ensured using a fragile watermark spread throughout the audio. In this paper, an audio watermarking procedure for hiding an imperceptible and fragile watermark using bit modification is presented. Altering or attacking the watermarked audio, simulated by adding Gaussian noise, showed that the watermark was lost at an SNR of no less than 100 dB for a noise-free speech from the TIMIT database or for a noisy audio from communication from an aircraft cockpit, even when the perceptual quality of the audio in both cases remained the same as the original audio.","PeriodicalId":421680,"journal":{"name":"2016 IEEE 14th International Conference on Industrial Informatics (INDIN)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121469898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：