期刊：
Journal of Applied Physics,2022年132(18):183907 ISSN：0021-8979
通讯作者：
Haiou Wang
作者机构：
[Wang, Haiou; Huo, Dexuan; Wang, Yan] Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key L, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.
通讯机构：
[Haiou Wang] K;Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University , Hangzhou 310018, China
摘要：
The magnetic properties, critical behavior, and magnetocaloric effect of perovskite NdMnO3 are studied. The Nd ordering is induced by the Mn ferromagnetic component with antiferromagnetic coupling with each other and then magnetization reversal occurs due to Mn moments reorientation induced by the ordering Nd moments, which explains the phenomenon of negative magnetization at low temperatures. The critical behavior of NdMnO3 is studied using Kouvel-Fisher and self-consistent methods. The results show that the Kouvel-Fisher method is reliable and critical exponents are coming out as beta = 0.462 for T-C = 11.15 K, gamma = 1.041 for T-C = 11.42 K, delta = 3.252 by critical isotherm analysis. Magnetic exchange distance may decay as J ( r ) & AP; r - 4.563, that is, somewhere between the three-dimensional Heisenberg model and the mean field model. Remarkably, three temperature transitions and the corresponding three extremum values including positive and negative entropy change are observed in NdMnO3, which is different from previous reports on NdMnO3. A positive entropy change as 3.82 J/kg K at 10-15 K for mu(0)& UDelta;H = 50 kOe and a negative entropy change as -0.557 J/kg K at around 8 K for mu(0)& UDelta;H = 5 kOe are found, which can be put down to a fast magnetization change of NdMnO3 because of the Nd moments ordering and Mn moments reorientation. Besides, an entropy change of 1.22 J/kg K is found for mu(0)& UDelta;H = 50 kOe at 80-85 K, which is corresponding to the Mn ferromagnetic ordering temperature. The relative cooling power of NdMnO3 reaches 105.9 J/kg, making it a promising candidate in the field of magnetic refrigeration. Published under an exclusive license by AIP Publishing.
作者机构：
[Su, Kunpeng; Zhang, Hui; Wang, Haiou; Yang, Dexin; Huang, Shuai; Huo, Dexuan; Wang, Yan] Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Ni, Shenya] Zhejiang Univ, Interdisciplinary Lab Mech, Hangzhou 310013, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Minist Educ, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Nanjing 210094, Peoples R China.
通讯机构：
[Haiou Wang; Dexuan Huo] K;Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou, China<&wdkj&>Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou, China
期刊：
Computers in Biology and Medicine,2022年149:105966 ISSN：0010-4825
通讯作者：
Kehua Guo<&wdkj&>Shuang Zhao
作者机构：
[Guo, Kehua; Wu, Zheng; Zhou, Jiancun] Cent South Univ, Sch Comp Sci & Engn, Changsha 410083, Peoples R China.;[Zhou, Jiancun] Hunan City Univ, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.;[Zhao, Shuang; Jiang, Zixi; Huang, Kai] Cent South Univ, Xiangya Hosp, Dept Dermatol, Changsha, Peoples R China.;[Zhao, Shuang; Jiang, Zixi; Huang, Kai] Cent South Univ, Xiangya Hosp, Hunan Engn Res Ctr Skin Hlth & Dis, Changsha, Peoples R China.;[Zhao, Shuang; Jiang, Zixi; Huang, Kai] Cent South Univ, Xiangya Hosp, Hunan Key Lab Skin Canc & Psoriasis, Changsha, Peoples R China.
通讯机构：
[Kehua Guo] S;[Shuang Zhao] D;School of Computer Science and Engineering, Central South University, Changsha 410083, China<&wdkj&>Department of Dermatology, Xiangya Hospital, Central South University, Changsha, China<&wdkj&>Hunan Engineering Research Center of Skin Health and Disease, Xiangya Hospital, Central South University, Changsha, China<&wdkj&>Hunan Key Laboratory of Skin Cancer and Psoriasis, Xiangya Hospital, Central South University, Changsha, China<&wdkj&>National Clinical Research Center of Geriatric Disorders, Xiangya Hospital, Central South University, China
期刊：
International Journal of Intelligent Systems,2022年37(12):11299-11318 ISSN：0884-8173
通讯作者：
Rong Tan<&wdkj&>Rong Tan Rong Tan Rong Tan
作者机构：
[Tan, Rong; Si, Wen] Shanghai Business Sch, Dept IoT Engn, Shanghai, Peoples R China.;[Yang, Gelan] Hunan City Univ, Dept Informat Sci & Engn, Yiyang, Peoples R China.
通讯机构：
[Rong Tan; Rong Tan Rong Tan Rong Tan] D;Department of IoT Engineering, Shanghai Business School, Shanghai, China
关键词：
center of pressure;fall detection;IoT system;security strategy;smart home
摘要：
In the field of motion monitoring in smart home, the 5G technology can be applied to Internet of Things systems for facilitating our daily life. In this paper, a comprehensive study on the fall detection system based on 5G network is presented. Starting with analyzing the moving stability, a wearable foot pressure measurement system is devised. Furthermore, the center of pressure during moving is computed by using the pressure data. Besides, the signal transmitting security issue is also considered. The physical layer security authentication and the cross-layer encryption are employed and integrated within the security strategy. As a case study, we evaluate the proposed method on fall detection tasks in smart home and the experimental results establish strong evidence of a satisfying performance.
作者机构：
[Ou, Yun] Hunan Univ Sci & Technol, Hunan Prov Key Lab Hlth Maintenance Mech Equipmen, Xiangtan 411201, Peoples R China.;[Wu, Yingying; Ou, Yun] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Peng, Jinlin] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.
通讯机构：
[Jinlin Peng] A;[Yun Ou] H;Hunan Provincial Key Laboratory of Health Maintenance for Mechanical Equipment, Hunan University of Science and Technology, Xiangtan 411201, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China<&wdkj&>Authors to whom correspondence should be addressed.<&wdkj&>All-Solid-State Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic Engineering, Hunan City University, Yiyang 413002, China
关键词：
misfit strain;PIN-PMN-PT;electrocaloric effect;ferroelectric thin films
摘要：
xPb(In1/2Nb1/2)O-3-(1-x-y)Pb(Mg1/3Nb2/3)O-3-yPbTiO(3) (PIN-PMN-PT) bulks possess excellent electromechanical coupling and dielectric properties, but the corresponding epitaxial PIN-PMN-PT thin films have not yet been explored. This paper adopts a nonlinear thermodynamics analysis to investigate the influences of misfit strains on the phase structures, electromechanical properties, and electrocaloric responses in epitaxial PIN-PMN-PT thin films. The misfit strain-temperature phase diagram was constructed. The results reveal that the PIN-PMN-PT thin films may exist in tetragonal c-, orthorhombic aa-, monoclinic M-, and paraelectric PE phases. It is also found that the c-M and aa-PE phase boundaries exhibit a superior dielectric constant epsilon(11) which reached 1.979 x 10(6) with u(m) = -0.494%, as well as the c-M phase boundary showing a large piezoelectric response d(15) which reached 1.64 x 10(5) pm/V. In comparison, the c-PE and M-aa phase boundaries exhibit a superior dielectric constant epsilon(33) over 1 x 10(5) around um = 0.316% and the piezoelectric response d(33) reached 7235 pm/V. The large electrocaloric responses appear near the paraelectric- ferroelectric phase boundary. These insights offer a guidance for experiments in epitaxial PIN-PMN-PT thin films.
通讯机构：
[Hongli Liu] C;College of Electrical and Information Engineering, Hunan University, Changsha 410082, China<&wdkj&>Author to whom correspondence should be addressed.
关键词：
deep learning;facial landmark detector;fatigue driving recognition;multi-scale
摘要：
Fatigue driving behavior recognition in all-weather real driving environments is a challenging task. Accurate recognition of fatigue driving behavior is helpful to improve traffic safety. The facial landmark detector is crucial to fatigue driving recognition. However, existing facial landmark detectors are mainly aimed at stable front face color images instead of side face gray images, which is difficult to adapt to the fatigue driving behavior recognition in real dynamic scenes. To maximize the driver’s facial feature information and temporal characteristics, a fatigue driving behavior recognition method based on a multi-scale facial landmark detector (MSFLD) is proposed. First, a spatial pyramid pooling and multi-scale feature output (SPP-MSFO) detection model is built to obtain a face region image. The MSFLD is a lightweight facial landmark detector, which is composed of convolution layers, inverted bottleneck blocks, and multi-scale full connection layers to achieve accurate detection of 23 key points on the face. Second, the aspect ratios of the left eye, right eye and mouth are calculated in accordance with the coordinates of the key points to form a fatigue parameter matrix. Finally, the combination of adaptive threshold and statistical threshold is used to avoid misjudgment of fatigue driving recognition. The adaptive threshold is dynamic, which solves the problem of the difference in the aspect ratio of the eyes and mouths of different drivers. The statistical threshold is a supplement to solve the problem of driver’s low eye threshold and high mouth threshold. The proposed methods are evaluated on the Hunan University Fatigue Detection (HNUFDD) dataset. The proposed MSFLD achieves a normalized mean error value of 5.4518%, and the accuracy of the fatigue driving recognition method based on MSFLD achieves 99.1329%, which outperforms that of state-of-the-art methods.
期刊：
Journal of Luminescence,2021年240:118419 ISSN：0022-2313
通讯作者：
Weiping Zhou<&wdkj&>Chunlin Ma
作者机构：
[Zhou, Weiping] Nanchang Univ, Sch Mat Sci & Engn, Nanchang 330031, Jiangxi, Peoples R China.;[Zhai, Zhangyin; Ma, Chenyu; Ma, Chunlin] Huaiyin Normal Univ, Sch Phys & Elect Elect Engn, Huaian 223001, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.
通讯机构：
[Weiping Zhou; Chunlin Ma] S;School of Materials Science and Engineering, Nanchang University, Nanchang, 330031, People's Republic of China<&wdkj&>School of Physics and Electronic Electrical Engineering, Huaiyin Normal University, Huaian, 223001, People's Republic of China
关键词：
Photoluminescence;Ferroelectricity;0.92(Na0.5Bi0.5)TiO3-0.08 (Ba0.90Ca0.10)(Ti0.92Sn0.08)O-3: Sm3+;Optical temperature sensing
摘要：
A series of Sm3+ doped 0.92(Na0.5Bi0.5)TiO3-0.08(Ba0.90Ca0.10)(Ti0.92Sn0.08)O-3 (NBT-8BCTS: xSm(3+), x = 0-0.025) lead-free piezoelectric ceramics are fabricated via a conventional solid-state reaction method, and their phase structure, photoluminescence properties and temperature dependent of luminescence spectra are studied in detail. The emission spectra with dominant orange-red emission consist of four emission peaks at 542 nm, 598 nm, 644 nm and 709 nm, which are ascribed to the (4)G(5/2) (->) H-6(J/2) (J = 5, 7, 9, 11) transition of Sm3+ ions, respectively. Furthermore, the optical temperature sensing properties of the NBT-8BCTS: 0.01Sm(3+) ceramic in the temperature range between 313 K and 533 K are analyzed with a maximum relative sensitivity 1.29%K-1 at T = 463 K. Besides, the phosphors exhibit excellent stable temperature sensing performance under repeated heat-cooling cycles. These results suggest that the Sm3+ doped NBT-8BCTS ceramics may have potential applications in multifunctional sensing devices by integrating its optical temperature sensing and intrinsic ferroelectric property.
通讯机构：
[Chengfeng Long; Xiaoyong Tang] S;School of Information and Intelligence Science and Technology, Hunan Agricultural University, Changsha, China<&wdkj&>School of Computer and Communications Engineering, Changsha University of Science and Technology, Changsha, China
摘要：
Considering the issue with respect to the high data redundancy and high cost of information collection in wireless sensor nodes, this paper proposes a data fusion method based on belief structure to reduce attribution in multi-granulation rough set. By introducing belief structure, attribute reduction is carried out for multi-granulation rough sets. From the view of granular computing, this paper studies the evidential characteristics of incomplete multi-granulation ordered information systems. On this basis, the positive region reduction, belief reduction and plausibility reduction are put forward in incomplete multi-granulation ordered information system and analyze the consistency in the same level and transitivity in different levels. The positive region reduction and belief reduction are equivalent, and the positive region reduction and belief reduction are unnecessary and sufficient conditional plausibility reduction in the same level, if the cover structure order of different levels are the same the corresponding equivalent positive region reduction. The algorithm proposed in this paper not only performs three reductions, but also reduces the time complexity largely. The above study fuses the node data which reduces the amount of data that needs to be transmitted and effectively improves the information processing efficiency.
摘要：
In this paper, we investigated the electromagnetically induced phase grating in a four-level quantum system with closed loop configuration via relative phase between applied fields. We found that the diffraction intensity can be adjusted via intensities and relative phase of applied lights. We also studied separately the diffraction patterns of amplitude and phase modulations of the probe light by controlling the intensity of cycling field. We found that the probe energy can transfer from zero order to high orders of diffraction when the phase modulation of the probe light becomes important. This study may be used for application in novel photonic devices in future quantum information processing.
期刊：
EURASIP JOURNAL ON WIRELESS COMMUNICATIONS AND NETWORKING,2021年2021(1):1-19 ISSN：1687-1472
通讯作者：
Shuguang Deng
作者机构：
[Qin, Hua; Tan, Yue; Cao, Buwen; Deng, Shuguang] Hunan City Univ, Coll Informat & Elect Engn, Yiyang 413000, Peoples R China.;[Qin, Hua; Tan, Yue; Cao, Buwen; Deng, Shuguang] Hunan City Univ, Key Lab City Comp & IoT, Yiyang 413000, Peoples R China.;[Qin, Hua; Tan, Yue; Cao, Buwen; Deng, Shuguang] Engn Res Ctr DongTing Lake Reg Ecol Environm Inte, Yiyang 413000, Peoples R China.
通讯机构：
[Shuguang Deng] C;College of Information and Electronic Engineering, Hunan City University, Yiyang, China<&wdkj&>Key Laboratory of City Computing and IoT, Hunan City University, Yiyang, China<&wdkj&>Engineering Research Center of DongTing Lake Regional Ecological Environment Intelligent Monitoring and Disaster Prevention and Mitigation, Yiyang, China
关键词：
Software defined sensor network;Cluster;Node mobility;Centralization
摘要：
The distributed clustering method is widely used to extend network lifetime in traditional wireless sensor networks. However, it is difficult to achieve the idea performance of the whole network, such as transmission rate, energy consumption, and control overhead, neglecting the global stability of the network. To tackle this problem, a centralized mobility-based clustering (CMBC) protocol is proposed in the software defined sensor network. The method of CMBC mainly consists of two aspects: first, CMBC clusters the nodes with the connection time between the mobile nodes (i.e., noncluster head nodes, non-CH) and the cluster head (CH) and establishes stable topological structures between the non-CHs and the CH; second, when emergencies occur, the centralization management control center sends the configuration files to replace the CH. Compared to the distributed network of MBC, WCRA and IMP-MECA protocol, the proposed method can be applied in scenarios with high-speed mobile nodes to improve the network performance in terms of transmission successful rate, average power consumption, and average control overhead.
期刊：
Journal of Materials Science: Materials in Electronics,2021年32(1):745-751 ISSN：0957-4522
通讯作者：
Zhang, Zhengzhong;Tan, Weishi
作者机构：
[Liu, Hao; Zhang, Zhengzhong] Huaiyin Inst Technol, Fac Appl Technol, Huaian 223003, Peoples R China.;[Wang, Ya] Shanghai Urban Construct Vocat Coll, Shanghai 201415, Peoples R China.;[Dong, Liming] Changshu Inst Technol, Sch Automat Engn, Changshu 215500, Jiangsu, Peoples R China.;[Wang, Haiou] Hangzhou Dianzi Univ, Inst Mat Phys, Hangzhou 310018, Peoples R China.;[Zhang, Yun] Nanjing Univ Sci & Technol, Dept Appl Phys, Nanjing 210094, Peoples R China.
通讯机构：
[Zhang, Zhengzhong; Tan, Weishi] H;Huaiyin Inst Technol, Fac Appl Technol, Huaian 223003, Peoples R China.;Hunan City Univ, All Solid State Energy Storage Mat & Devices Key, Coll Commun & Elect Engn, Yiyang 413002, Peoples R China.
期刊：
JOURNAL OF PHYSICS-CONDENSED MATTER,2021年33(28):285802 ISSN：0953-8984
通讯作者：
Haiou Wang<&wdkj&>Weishi Tan
作者机构：
[Wang, Haiou; Zhang, Hui; Huo, Dexuan; Wang, Yan] Hangzhou Dianzi Univ, Inst Mat Phys, Key Lab Novel Mat Sensor Zhejiang Prov, Hangzhou 310018, Peoples R China.;[Tan, Weishi] Hunan City Univ, Coll Informat & Elect Engn, All Solid State Energy Storage Mat & Devices Key, Yiyang 413002, Peoples R China.;[Tan, Weishi] Nanjing Univ Sci & Technol, Dept Appl Phys, Key Lab Soft Chem & Funct Mat, Minist Educ, Nanjing 210094, Peoples R China.
通讯机构：
[Haiou Wang] K;[Weishi Tan] A;Key Laboratory of Novel Materials for Sensor of Zhejiang Province, Institute of Material Physics, Hangzhou Dianzi University, Hangzhou 310018, People's Republic of China<&wdkj&>All-solid-state Energy Storage Materials and Devices Key Laboratory of Hunan Province, College of Information and Electronic Engineering, Hunan City University, Yiyang 413002, People's Republic of China<&wdkj&>Key Laboratory of Soft Chemistry and Functional Materials, Ministry of Education, Department of Applied Physics, Nanjing University of Science and Technology, Nanjing 210094, People's Republic of China
摘要：
Emergent phenomena at interfaces have been investigated intensely in pursuit of the next generation spintronics. In this work, we have integrated heterostructure consisting of paramagnetic (PM) metallic Pt and antiferromagnetic (AFM) insulator LaMnO(3)(LMO). High-quality Pt (3nm)/LMO (100nm) heterostructure has been obtained by pulsed laser deposition. The structure, lattice strain and magnetic properties of epitaxial Pt/LMO heterostructure are fully studied. Due to the high sensitivity of synchrotron radiation and the high quality of epitaxial layer, the reflection intensity of the 3 nm-thick ultrathin Pt layer and LMO layer can be detected, and then lattice strain can be calculated. The LMO layer is under relative large tensile strain (2.13%), while the Pt layer is under relative small compressive strain (-0.46%). Magnetization measurements suggest that unexpected ferromagnetic behavior is observed clearly in the PM-Pt/AFM-LMO heterostructure. Moreover, spin glass (SG) state and exchange bias (EB) is also observed in this heterostructure. SG state is observed as a result of competing magnetic orders and spin frustration at the Pt/LMO interface. The heterostructure shows the EB effect below blocking temperature (T(B)), which is much lower than the Néel temperature (T(N)) of LMO, suggesting that the EB is strongly related to the SG state. The EB originates from the coupling between the SG and AFM phases.
摘要：
We propose a simple quasi-continuous monolayer graphene structure and achieve a dynamically tunable triple plasmon-induced transparency (PIT) effect in the proposed structure. Additional analyses indicate that the proposed structure contains a self-constructed bright-dark-dark mode system. A uniform theoretical model is introduced to investigate the spectral response characteristics and slow light-effects in the proposed system, and the theoretical and the simulated results exhibit high consistency. In addition, the influences of the Fermi level and the carrier mobility of graphene on transmission spectra are discussed. It is found that each PIT window exhibits an independent dynamical adjustability owing to the quasi-continuity of the proposed structure. Finally, the slow-light effects are investigated based on the calculation of the group refractive index and phase shift. It is found that the structure displays excellent slow-light effects near the PIT windows with high-group indices, and the maximum group index of each PIT window exceeds 1000 when the carrier mobility of graphene increases to 3.5 m2 V−1 s−1. The proposed structure has potential to be used in multichannel filters, optical switches, modulators, and slow light devices. Additionally, the established theoretical model lays a theoretical basis for research on multimode coupling effects.
