Environment-aware based access point deployment optimization for cell-free massive MIMO system by Jing JIANG, Yongqiang LIU, Fengyang YAN, Sha TAO, Sutthiphan WORAKRIN

“…Cell-free massive multiple-input multiple-output (MIMO) systems deploy a large number of access point (AP) across the coverage area which can provide uniform high-rate services to users.However, the quality of coverage would be affected by path loss, shadow fading scatters, and environmental occlusions around the randomly placed AP in conventional cell-free massive MIMO systems that do not consider their impact.Considering the impact of actual wireless propagation environments, an AP deployment scheme was proposed to acquire uniform and consistent coverage.Firstly, a hybrid probabilistic path loss model was utilized to characterize various wireless propagation environments.Then, the AP deployment optimization problem was solved with the objective of maximizing the average throughput.Finally, the problem was transformed into a Markov game process and solved by the multi-agent deep deterministic policy gradient (MADDPG) algorithm.The simulation results demonstrate that the proposed scheme can provide more uniform coverage in complex environments and serve users with reliable and consistent service compared to random AP deployment and existing AP deployment methods.…”
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DYNAMIC RELIABILITY ANALYSIS OF PHOTOVOLTAIC SUPPORT SYSTEM CONSIDERING MULTIPLE UNCERTAINTIES by ZHONG Wei, YANG HuanHong, MA XiangDong, HUANG LongAn

“…Dynamic reliability analysis method of photovoltaic support system(PSS)was proposed considering the multiple uncertainties.Firstly,the reliability analysis model of PSS was constructed based on the probability density evolution method(PDEM),including the probability conservation equation,basic governing equation and density evolution equation.Then,the finite element analysis model of PSS was built,including the structural stress model,load combination form,and mesh generation algorithm.In simulation,the randomness in load combination and structures were incorporated,in which consists of six basic random parameters and 44 representative systems.The solution efficiency was improved by the joint simulation of PDEM and Abaqus.Results show that stress and displacement are two failure modes of PSS,and the influence of the latter is more obvious.The reliability index under the basic load combination condition is 0.928.As wind speed increases,the structural reliability decreases.In the high⁃speed range larger than 40 m/s,the uncertainty in structure itself will overestimate the reliability level of PSS,which should be paid attention in design.…”
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ANALYSIS OF STOCHASTIC RELIABILITY AND FAILURE RISK OF COLUMN DISCONNECTOR UNDER TYPHOON BASED ON THE PROBABILITY DENSITY EVOLUTION MODEL by SHI ShouJian, CHEN WenTong, YANG HuanHong, ZHU LiangLong, WU XueFeng, XU ChengHao

“…To estimate the structural failure risk of column disconnector subjected to typhoon, the efficient solution model of stochastic reliability was established considering the uncertainties of wind field and material resistance. First, the typhoon random field model was given based on the power spectral density, in which the uncertainties of ground roughness, average wind speed, and boundary wave number were incorporated. …”
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Contribution of Personnel Management to the Generation of Innovation Capabilities in Medium and Large Companies in Colombia by Rubio-Rodríguez Gustavo Adolfo, Ortiz Yeison Farid Méndez, Cardoso Elizabeth Palma, Perdomo Efraín Enrique Granados

“…Since the population to be studied is finite and known, a stratified random probability sampling with finite population adjustment is carried out, since the possibility of selecting one or another element is equal. …”
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Regional Variation in the Carbon Dioxide Emission Efficiency of Construction Industry in China: Based on the Three-Stage DEA Model by Weizhong Zhou, Wenhua Yu

“…The research results indicate that the environmental factors and random error seriously affect the carbon dioxide emission efficiency of construction industry. …”
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Certificateless ciphertext retrieval scheme with multi-user and multi-keyword based on cloud-edge collaboration by Xiaodong YANG, Tian TIAN, Jiaqi WANG, Meijuan LI, Caifen WANG

“…To solve the problems of single-user search, single-keyword search, high computational cost and low-security level of ciphertext data retrieval in the industrial Internet of things environment, a certificateless ciphertext retrieval scheme with multi-user and multi-keyword based on cloud-edge collaboration was proposed.A user access permissions table was set and once encryption algorithm was executed to realize multi-user search and update users’ access permissions.A cloud-side collaborative computing model was introduced to match keyword ciphertext and keyword trapdoor efficiently by a linear scanning method when the keyword ciphertext does not entirely contain the search keyword.Key escrow and certificate management problems were solved by utilizing certificateless encryption system.Keyword ciphertext authentication was ensured by using digital signature technology.The security analysis results show that the proposed scheme can resist internal keyword guessing attacks under the random oracle model.Simulation results show that the proposed scheme has higher computational efficiency compared with similar schemes.…”
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Construction of Regional Logistics Weighted Network Model and Its Robust optimization: Evidence from China by Lizhao Yan, Yi Wen, Kok Lay Teo, Jian Liu, Fei Xu

“…Finally, we analyze the model’s response to random attacks and deliberate attacks. From our study, it is found that when the failure nodes or edges reach a certain percentage, the regional logistics network will collapse on a large scale. …”
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Study on Synthesis Method of Multipoint Seismic Waves for Buried Oil and Gas Pipeline in Shaking Table Tests by Jian-Bo Dai, Gui-Di Zhang, Cheng-Tao Hu, Kai-Kai Cheng

“…At the same time, the synthesized multipoint seismic wave based on the actual seismic record and artificial random simulation seismic wave can meet the test requirements, which suggests the testing effect is good.…”
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Risk Assessment Method for Offshore Structure Based on Global Sensitivity Analysis by Zou Tao, Li Huajun, Liu Defu

“…This method quantifies all the significances among random variables and their parameters at first. And by comparing the degree of importance, all minor factors would be negligible. …”
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Profile of Ecoliteracy Ability of Science Students On Environmental Issues by Annisa Novianti Taufik, Liska Berlian, Ajeng Restu Wahyuni, Mia Khofifah

“…Teknik pengambilan sampel menggunakan random sampling dengan jumlah 27 orang mahasiswa IPA Angkatan 2022. …”
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A Method for Improving the Accuracy of Link Prediction Algorithms by Jie Li, Xiyang Peng, Jian Wang, Na Zhao

“…At present, scholars have proposed many link prediction algorithms based on the similarity of local information and random walks. These algorithms help identify actual missing and false links in various networks. …”
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Probabilistic slope stability analysis: a case study of Ain Bouzian landslide within North-East Algeria by Samir Ghedjati, Mohammed Lamara, Youcef Houmadi

“…This region suffers of many instability problems, which is aggravated during the construction of East-West motorway. The random variables for the soil considered in this study are the Young modulus E, cohesion C and friction angle φ. …”
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Effect of Conscientiousness and COVID-19-Induced Job Stress on Organizational Citizenship Behavior Among Healthcare Professionals by Shayista Majeed, Sabiya Mufti, Sabzar Ahmad Peerzadah, Nazir Ahmed Nazir

“…Data for the study were collected from 379 healthcare professionals in India through a systematic random sampling technique. The results revealed a positive impact of conscientiousness on OCB. …”
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Learning attribute network algorithm based on high-order similarity by Shaoqing WU, Yihong DONG, Xiong WANG, Yan CAO, Yu XIN

“…Due to the lack of deep-level information mining and utilization in the existing network representation learning methods,the potential pattern structure similarity was proposed by further exploring the potential information in the network.The similarity score between network structures was defined to measure the similarity between various structures so that nodes could cross irrelevant vertices to obtain high-order similarities on the global structure.In order to achieve the best effect,deep learning was used to fuse multiple information sources to participate in training together to make up for the deficiency of random walks.In the experiment,Lap,DeepWalk,TADW,SDNE and CANE were selected as comparison methods,and three real-world networks were used as data sets to verify the validity of the model,and experiments of node classification and link reconstruction are carried out.In the node classification,the average performance is improved by 1.7 percentage points for different datasets and training proportions.In the link reconstruction experiment,only half the dimension is needed to achieve better performance.Finally,the performance improvement of the model under different network depths was discussed.By increasing the depth of the model,the average performance of node classification increased by 1.1 percentage points.…”
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Lung Cancer Prediction Based on K-nearest Neighbor and Other Algorithms by Ren Yimo

“…The computer algorithms mainly used in this paper include Random forest, K-nearest neighbours, and Logistic regression. …”
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Numerical Simulation of Multiplicity and Stability of Mixed Convection in Rotating Curved Ducts by Wang Liqiu, Yang Tianliang

“…Dynamic responses of the multiple solutions to finite random disturbances are examined by the direct transient computation. …”
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Output-Only Modal Analysis Based on Improved Empirical Mode Decomposition Method by Shiqiang Qin, Qiuping Wang, Juntao Kang

“…Next, the modal parameters are extracted from intrinsic mode function obtained from the improved EMD by both random decrement technique and stochastic subspace identification. …”
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Límite Pirineos. Una mirada global a la participación de anarquistas españoles en la Resistencia francesa by Diego Gaspar Celaya

“…Overcoming the factors that have made the study of Spanish participation in the French Resistance random for a number of years, this article aims to provide a renovated overview of the Spanish anarchist participation in French Resistance through a detailed analysis of the different resistant commitments carried out by them during the second world conflict. …”
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Figure-ground segmentation based on motion in the archerfish by Svetlana Volotsky, Ronen Segev

“…Specifically, the figures were defined by grating, naturalistic texture, and random noise moving in counterphase with the background. …”
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Multi-keyword search over encrypted data with user revocation by Qi-ying WU, Jian-feng MA, Hui LI, Jun-wei ZHANG, Qi JIANG, Yin-bin MIAO

“…A mu1ti-keyword search over encrypted data was proposec1 with fi1e-1eve1 access authorization and data user revocation scheme through emp1oying ciphertext-po1icy attribute-based encryption（CP-ABE）.The scheme supports fi1e-1eve1 access authorization in the mu1ti-owner mu1ti-user settings，which means that data users cou1d on1y gain the authorized fi1es encrypted by different data owners with different keys.Moreover，the scheme cou1d achieve data user revocation.Forma1 security ana1ysis shows that the proposed scheme cou1d resist the chosen keyword attack in random orac1e.Moreover，the experimenta1 study over rea1-wor1d dataset demonstrates its efficiency and feasibi1ity in practice.…”
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