STATISTICAL ANALYSIS TECHNIQUES OF NONLINEAR DYNAMIC SYSTEM

Lin Xiaohui,Chi Naigang,Jin Yongde 대한전자공학회 1995 International Conference on Electronics, Informati Vol.1995 No.8

PEC: A Privacy-Preserving Emergency Call Scheme for Mobile Healthcare Social Networks

Xiaohui Liang,Rongxing Lu,Le Chen,Xiaodong Lin,Xuemin (Sherman) Shen 한국통신학회 2011 Journal of communications and networks Vol.13 No.2

In this paper, we propose a privacy-preserving emergency call scheme, called PEC, enabling patients in life-threatening emergencies to fast and accurately transmit emergency data to the nearby helpers via mobile healthcare social networks (MHSNs). Once an emergency happens, the personal digital assistant (PDA)of the patient runs the PEC to collect the emergency data including emergency location, patient health record, as well as patient physiological condition. The PEC then generates an emergency call with the emergency data inside and epidemically disseminates it to every user in the patient’s neighborhood. If a physician happens to be nearby, the PEC ensures the time used to notify the physician of the emergency is the shortest. We show via theoretical analysis that the PEC is able to provide fine-grained access control on the emergency data, where the access policy is set by patients themselves. Moreover,the PEC can withstandmultiple types of attacks, such as identity theft attack, forgery attack, and collusion attack. We also devise an effective revocation mechanism to make the revocable PEC (rPEC) resistant to inside attacks. In addition, we demonstrate via simulation that the PEC can significantly reduce the response time of emergency care in MHSNs.

PEC: A Privacy-Preserving Emergency Call Scheme for Mobile Healthcare Social Networks

Liang, Xiaohui,Lu, Rongxing,Chen, Le,Lin, Xiaodong,Shen, Xuemin (Sherman) The Korea Institute of Information and Commucation 2011 Journal of communications and networks Vol.13 No.2

In this paper, we propose a privacy-preserving emergency call scheme, called PEC, enabling patients in life-threatening emergencies to fast and accurately transmit emergency data to the nearby helpers via mobile healthcare social networks (MHSNs). Once an emergency happens, the personal digital assistant (PDA) of the patient runs the PEC to collect the emergency data including emergency location, patient health record, as well as patient physiological condition. The PEC then generates an emergency call with the emergency data inside and epidemically disseminates it to every user in the patient's neighborhood. If a physician happens to be nearby, the PEC ensures the time used to notify the physician of the emergency is the shortest. We show via theoretical analysis that the PEC is able to provide fine-grained access control on the emergency data, where the access policy is set by patients themselves. Moreover, the PEC can withstandmultiple types of attacks, such as identity theft attack, forgery attack, and collusion attack. We also devise an effective revocation mechanism to make the revocable PEC (rPEC) resistant to inside attacks. In addition, we demonstrate via simulation that the PEC can significantly reduce the response time of emergency care in MHSNs.

Forming Limit and Mechanical Properties of 2024-O Aluminum Alloy Under Electromagnetic Forming

Yuhong Lin,Xiaohui Cui,Kanghua Chen,Ang Xiao,Ziqin Yan 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.10

The effect of electromagnetic forming (EMF) on the forming limit and properties of 2024-O aluminum alloy is studied in thispaper. This was done to address the important problems related to the poor forming limit of aluminum alloy when conventionalstamping is used. The evolution of the microstructure of the alloy during quasi-static stamping (QS) and the dynamicdeformation is analyzed. This was done using mechanical testing, texture analysis, scanning electron microscopy (SEM),fracture analysis, and transmission electron microscopy (TEM). Compared with QS, the forming limit for EMF increases by36.9%. For the same deformation height with 17.6mm, the maximum degree of thickness thinning of the sample for EMF is4.7%, and 6.4% for QS. The thickness distribution of the EMF sample is more uniform than for the QS sample. Numericalsimulation shows the maximum principal stresses at different points were almost same with each other after EMF, whichleads to uniformity plastic deformation of samples. In addition, the grain size of the material decreases, the proportion ofsmall-angle grains increases, and the copper texture increases after EMF. When EMF is used, the dislocation density of thesample is significantly higher than for QS and the dislocation distribution is more uniform. The temperature rise is small,which is not a significant reason for dislocation dispersed in EMF.

The Application of Kalman Filter to the Natural Gamma Spectrum Well Logging

Cui Naigang,Lin Xiaohui,Jin Yongde 대한전자공학회 1995 International Conference on Electronics, Informati Vol.1995 No.8

Automatic Optical Inspection of Bump Offsets in Flex-on-glass Bonding Using Differential Interference Contrast Imaging

Guangming Ni,Lin Liu,Jing Zhang,Juanxiu Liu,Xiangzhou Wang,Xiaohui Du,Huimin Yue,Yong Liu 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.2

Bump offsets have harmful effects on the quality of flex-on-glass (FOG) bonding in liquid crystal display (LCD) module industry. Here we report a novel automatic optical inspection (AOI) method to achieve fast inspecting FOG bonding bump offsets. Overcoming difficulties to image targets at different depths in light absorption medium when using ultra-short-exposure and high-speed imaging, the proposed method innovatively achieves inspecting FOG bonding bump offsets using differential interference contrast imaging based on spatial Poisson point process approximation. Theoretical analysis proves that the proposed method has high reliability in FOG bonding bump offset AOI inspection. Experimental results show missed detection rate of the inspection algorithm is 0.01%, and false rate is 0.1%, and verify the accuracy and validity of the proposed method, all of which are significant for guiding practice in LCD module industry.

User Association and Base Station Sleep Management in Dense Heterogeneous Cellular Networks

( Gongchao Su ),( Bin Chen ),( Xiaohui Lin ),( Hui Wang ),( Lemin Li ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.4

Dense Heterogeneous Cellular Networks(HCNs) offer a promising approach to meet the target of 1000x increase in aggregate data rates in 5G wireless communication systems. However how to best utilize the available radio resources at densely deployed small cells remains an open problem as those small cells are typically unplanned. In this paper we focus on balancing loads across macro cells and small cells by offloading users to small cells, as well as dynamically switching off underutilized small cells. We propose a joint user association and base station(BS) sleep mangement(UA-BSM) scheme that proactively offloads users to a fraction of the densely deployed small cells. We propose a heuristic algorithm that iteratively solves the user association problem and puts BSs with low loads into sleep. An interference relation matrix(IRM) is constructed to help us identify the candidate BSs that can be put into sleep. User associations are then aggregated to selected small cells that remain active. Simulation results show that our proposed approach achieves load balancing across macro and small cells and reduces the number of active BSs. Numerical results show user signal to interference ratio(SINR) can be improved by small cell sleep control.

Comparison of Endocrine Therapies in Hormone Receptor-Positive and Human Epidermal Growth Factor Receptor 2-Negative Locally Advanced or Metastatic Breast Cancer: A Network Meta-Analysis

Siqi Liu,Xin Sun,Xiaohui Xu,Fangcai Lin 한국유방암학회 2020 Journal of breast cancer Vol.23 No.5

We aimed to explore what kind of endocrine treatments are optimal for hormone receptor-positive and human epidermal growth factor receptor 2-negative locally advanced or metastatic breast cancer in some specific clinical situations. We searched randomized controlled trials in Embase, Medline, the Cochrane library, and PubMed from inception to April 1, 2020 and performed a network meta-analysis based on a Bayesian fixed-effects model. Progression-free survival (PFS) with hazard ratios and corresponding 95% confidence interval was defined as the primary endpoint, while overall survival (OS), objective response rate (ORR), clinical benefit rate and serious adverse events were used as secondary endpoints. A total of 35 studies involving 12,285 patients and 24 treatment options were included. In general, most co-treatment options prolonged PFS compared to single-agent therapy, of which aromatase inhibitor (AI) plus everolimus and fulvestrant plus palbociclib were probably the most effective agents, and the latter had the best safety record. However, despite the superior efficacy of fulvestrant plus capecitabine for PFS and OS, palpable toxic effects have been demonstrated for this treatment, so its application must be scrupulously considered. The results of subgroup analysis indicated that fulvestrant combined with palbociclib improved prognosis for phosphatidylinositol 3-kinase (PI3K)-mutated patients, PI3K-unmutated patients, patients with endocrine therapy resistance, and visceral metastatic patients, while no obvious improvement was detected in OS. Moreover, the efficacy of fulvestrant plus cyclin-dependent kinase 4/6 (CDK4/6) inhibitors was slightly better than that of AI plus CDK4/6 inhibitors, while AI plus everolimus was more efficacious than fulvestrant combined with everolimus in terms of PFS, OS, and ORR. In conclusion, our results provide moderate evidence that fulvestrant plus palbociclib and AI plus everolimus were the most effective treatments, while the efficacy and safety of fulvestrant plus palbociclib was obviously superior in some specific clinical situations.

QoS Constrained Optimization of Cell Association and Resource Allocation for Load Balancing in Downlink Heterogeneous Cellular Networks

( Gongchao Su ),( Bin Chen ),( Xiaohui Lin ),( Hui Wang ),( Lemin Li ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5

This paper considers the optimal cell association and resource allocation for load balancing in a heterogeneous cellular network subject to user`s quality-of-service (QoS) constraints. We adopt the proportional fairness (PF) utility maximization formulation which also accommodates the QoS constraints in terms of minimum rate requirements. With equal resource allocation this joint optimization problem is either infeasible or requires relaxation that yields a solution which is difficult to implement. Nevertheless, we show that this joint optimization problem can be effectively solved without any priori assumption on resource allocation and yields a cell association scheme which enforces single BS association for each user. We re-formulated the joint optimization problem as a network-wide resource allocation problem with cardinality constraints. A reweighted heuristic l1-norm regularization method is used to obtain a sparse solution to the re-formulated problem. The cell association scheme is then derived from the sparsity pattern of the solution, which guarantees a single BS association for each user. Compared with the previously proposed method based on equal resource allocation, the proposed framework results in a feasible cell association scheme and yields a robust solution on resource allocation that satisfies the QoS constraints. Our simulations illustrate the impact of user`s minimum rate requirements on cell association and demonstrate that the proposed approach achieves load balancing and enforces single BS association for users.

Energy-Efficient Traffic Grooming in Bandwidth Constrained IP over WDM Networks

( Bin Chen ),( Zijian Yang ),( Rongping Lin ),( Mingjun Dai ),( Xiaohui Lin ),( Gongchao Su ),( Hui Wang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.6

Minimizing power consumption in bandwidth limited optical traffic grooming networks is presented as a two-objective optimization problem. Since the main objective is to route a connection, the network throughput is maximized first, and then the minimum power consumption solution is found for this maximized throughput. Both transparent IP over WDM (Tp-IPoWDM) and translucent IP over WDM (Tl-IPoWDM) network may be applied to examine such bi-objective algorithms. Simulations show that the bi-objective algorithms are more energy-efficient than the single objective algorithms where only the throughput is optimized. For a Tp-IPoWDM network, both link based ILP (LB-ILP) and path based ILP (PB-ILP) methods are formulated and solved. Simulation results show that PB-ILP can save more power than LB-ILP because PB-ILP has more path selections when lightpath lengths are limited. For a Tl-IPoWDM network, only PB-ILP is formulated and we show that the Tl-IPoWDM network consumes less energy than the Tp-IPoWDM network, especially under a sparse network topology. For both kinds of networks, it is shown that network energy efficiency can be improved by over-provisioning wavelengths, which gives the network more path choices.