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Frontiers of Computer Science 2012年第4期6卷 442-461页

作者： xiaojun bi Jing XIAO School of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China School of Information Engineering Liaoning Provincial College of CommunicationsShenyang 110122China

Multi-lateral multi-issue negotiations are the most complex realistic negotiation problems. Automated ap- proaches have proven particularly promising for complex ne- gotiations and previous research indicates evolutionary com- putation could be useful for such complex systems. To im- prove the efficiency of realistic multi-lateral multi-issue ne- gotiations and avoid the requirement of complete informa- tion about negotiators, a novel negotiation model based on art improved evolutionary algorithm p-ADE is proposed. The new model includes a new multi-agent negotiation protocol and strategy which utilize p-ADE to improve the negotia- tion efficiency by generating more acceptable solutions with stronger suitability for all the participants. Where p-ADE is improved based on the well-known differential evolution （DE）, in which a new classification-based mutation strategy DE/rand-to-best/pbest as well as a dynamic self-adaptive pa- rameter setting strategy are proposed. Experimental results confirm the superiority of p-ADE over several state-of-the-art evolutionary optimizers. In addition, the p-ADE based multi- agent negotiation model shows good performance in solving realistic multi-lateral multi-issue negotiations.

关键词： differential evolution global optimum e-commerce agent multi-lateral multi-issue negotiation

Explanations of the DAMPE high energy electron/positron spectrum in the dark matter annihilation and pulsar scenarios

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 19-29页

作者： bingbing Wang xiaojun bi SuJie Lin PengFei Yin Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China University of Chinese Academy of Sciences Beijing 100049 China

Many studies have shown that either the nearby astrophysical source or dark matter （DM） annihilation/decay can be used to explain the excess of high energy cosmic ray （CR） e^±which is detected by many experiments, such as PAMELA and AMS-02. Recently, the dark matter particle explorer （DAMPE） collaboration has reported its first result of the total CR e^± spectrum from 25 GeV to 4.6TeV with high precision. In this work, we study the DM annihilation and pulsar interpretations of this result. We show that the leptonic DM annihilation channels to r＋＇/＂-, 4p, 4＂/＇, and mixed charged lepton final states can well explain the DAMPE e^± spectrum. We also find that the mixed charged leptons channel would lead to a sharp drop structure at - TeV. However, the ordinary DM explanations have been almost excluded by the constraints from the observations of gamma-ray and CMB, unless some exotic DM models are introduced. In the pulsar scenario, we analyze 21 nearby known pulsars and assume that one of them dominantly contributes to the high energy CR e^± spectrum. Involving the constraint from the Fermi-LAT observation of the e^± anisotropy, we find that two pulsars could explain the DAMPE e^± spectrum. Our results show that it is difficult to discriminate between the DM annihilation and single pulsar explanations of high energy e^± with the current DAMPE result.

关键词： cosmic rays dark matter pulsars

A New 3D Wireless Directional Sensing Model and Coverage Enhancement Algorithm

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Journal of Harbin Institute of Technology(New Series) 2016年第1期23卷 41-45页

作者： xiaojun bi Pengfei Diao College of Information and Communication Engineering Harbin Engineering University

Coverage control for each sensor is based on a 2D directional sensing model in directional sensor networks conventionally. But the 2D model cannot accurately characterize the real environment. In order to solve this problem,a new 3D directional sensor model and coverage enhancement algorithm is proposed. We can adjust the pitch angle and deviation angle to enhance the coverage rate. And the coverage enhancement algorithm is based on an improved gravitational search algorithm. In this paper the two improved strategies of GSA are directional mutation strategy and individual evolution strategy. A set of simulations show that our coverage enhancement algorithm has a good performance to improve the coverage rate of the wireless directional sensor network on different number of nodes,different virtual angles and different sensing radius.

关键词： 3D wireless directional sensor network coverage enhancement gravitational search algorithm

Cross-Language Transfer Learning-based Lhasa-Tibetan Speech Recognition

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Computers, Materials & Continua 2022年第10期73卷 629-639页

作者： Zhijie Wang Yue Zhao Licheng Wu xiaojun bi Zhuoma Dawa Qiang Ji School of Information Engineering Minzu University of ChinaBeijing100081China School of Chinese Ethnic Minority Languages and Literatures Minzu University of ChinaBeijing100081China Department of Electrical Computerand Systems EngineeringRensselaer Polytechnic InstituteTroyNY 12180-3590USA

As one of Chinese minority languages,Tibetan speech recognition technology was not researched upon as extensively as Chinese and English were until ***,along with the relatively small Tibetan corpus,has resulted in an unsatisfying performance of Tibetan speech recognition based on an end-to-end *** paper aims to achieve an accurate Tibetan speech recognition using a small amount of Tibetan training *** demonstrate effective methods of Tibetan end-to-end speech recognition via cross-language transfer learning from three aspects:modeling unit selection,transfer learning method,and source language *** results show that the Chinese-Tibetan multi-language learning method using multilanguage character set as the modeling unit yields the best performance on Tibetan Character Error Rate(CER)at 27.3%,which is reduced by 26.1%compared to the language-specific *** our method also achieves the 2.2%higher accuracy using less amount of data compared with the method using Tibetan multi-dialect transfer learning under the same model structure and data set.

关键词： Cross-language transfer learning low-resource language modeling unit Tibetan speech recognition

ESTIMATION OF 2-D DOA USING NON-CIRCULAR MUSIC METHOD FOR UNIFORM CIRCULAR AND RECTANGULAR ARRAYS

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Journal of Electronics(China) 2011年第1期28卷 38-43页

作者： Li Rui Shi Xiaowei Xu Le bi xiaojun Li Ping National Key Laboratory of Science and Technology on Antennas and Microwaves Xidian University Xi＇ an 710071 China MMIC Laboratory Microwave Group ECE Department National University of Singapore Singapore

This paper extends the Non-Circular MUltiple SIgnal Classification(MUSIC)(NC-MUSIC) method for the common array geometries including Uniform Circular Arrays(UCAs) and Uniform Rectangular Arrays(URAs),which enables the algorithm to estimate 2-D Direction Of Arrival(DOA).A comparison between UCAs and URAs of NC-MUSIC is made in this *** simulations show that the NC-MUSIC method doubles the maximum estimation number of standard *** non-circular signals,the performance of URAs is improved remarkably while the improvement of UCAs is not so ***,the influence of arrays structures on the NC-MUSIC method is discussed.

关键词： Non-circular signals MUltiple SIgnal Classification(MUSIC) Array 2-D Direction Of Arrival(DOA)

Detection of Dark Matter Particles and Progress

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Bulletin of the Chinese Academy of Sciences 2019年第1期33卷 43-48页

作者： bi xiaojun ZHANG Ling Institute of High Energy Physics CAS

Dark matter is a type of invisible matter discovered by astronomers when observing the universe. The Word "dark" refers to the mysterious fact that no electromagnetic radiation can be observed from this matter. As we ... 详细信息

关键词： matter astronomers know

Assessment of Effect of Angiotensin Ⅱ Receptor Antagonist Losartan on Aortic Distensibility in Patients With Essential Hypertension by Echocardiography

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Journal of Huazhong University of Science and Technology(Medical Sciences) 2002年第2期22卷 164-167页

作者： YANG Haoyi DENG Youbin LI Chunlei bi xiaojun PAN Min CHANG Qing Department of Medical Ultrasound Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030

The effects of angiotensinⅡreceptor antagonist losartan on elastic properties of aorta in patients with mild to moderate essential hypertension were *** ascending aortic distensibility in 26 patients(48±3 years)with mild to moderate essential hypertension before and after 12 weeks of treatment with losartan(50 mg/day)was evaluated by using two-dimensional echocardiography.M-mode measurements of aortic systolic(D_(s))anD_(d)iastolic diameter(D_(d))were taken at a level approximately 3 cm above the aortic ***,cuff brachial artery systolic(SBP)anD_(d)iastolic(DBP)pressures were *** pressure-strain elastic modulus(E p)was calculated as D_(d)×(SBP-DBP)/(D_(s)-D_(d))×1333 and stiffness index beta(β)was defined as D_(d)×Ln(SBP/DBP)/(D_(s)-D_(d)).Blood pressure significantly decreased from 148±13/95±9 mmHg to 138±12/88±8 mmHg(systolic blood pressure,P=0.001;diastolic blood pressure,P=0.003).There was no significant difference in pulse pressure before and after treatment with losartan(53±10 mmHg vs 50±7 mmHg).The distensibility of ascending aorta increaseD_(s)ignificantly as showed by the significant decrease in pressure-strain elastic modulus from 4.42±5.79×10^(6)dynes/cm^(2)to 1.99±1.49×10^(6)dynes/cm^(2)(P=0.02)anD_(s)tiffness index beta from^(2)7.4±32.9 to 13.3±9.9(P=0.02).Although there was a weak correlation between the percent changes in pressure-strain elastic modulus anD_(s)tiffness index beta and that in diastolic blood pressure after losartan treatment(r=0.40,P=0.04 and r=0.55,P=0.004,respectively),no correlation was found between the percent changes in pressure-strain elastic modulus anD_(s)tiffness index beta and that in systolic blood pressure(r=0.04,P=0.8 and r=0.24,P=0.2,respectively).Our study demonstrated that angiotensinⅡreceptor antagonist losartan has a beneficial effect on aortic distensibility in patients with mild to moderate essential hypertension and this effect is partly independent of blood pressure reduction.

关键词： hypertension angiotensin receptor antagonist losartan echocardiography aortic distensibility

Dilated Residual Spatial Attentive Generative Adversarial Network for Single Image De-raining

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Dilated Residual Spatial Attentive Generative Adversarial Ne...

作者： Junyao Xing xiaojun bi College of Information and Communication Engineering Harbin Engineering University College of Information Engineering Minzu University of China

This paper propose a dilated residual spatial attentive generative adversarial network for single image *** improved spatial attentive mechanism is combined with the dilated convolution residual module to optimize the Condition Generative Adversarial Network（CGAN） structure,to solve two problems still exist in the task of removing rain from a single image:First,the rain streaks contained in the dataset we can use are limited,and in the case of real rainy days,the rain streak density is diverse,it is impossible to simulate them completely and ***,the existing rain removal models cannot remove rain streaks properly for images with different rain streak density which attend to over or under rain *** our methods,Firstly,the dilated convolution module is used to enhance the feature extraction of rain streaks,and then an attention map is generated by the spatial attention mechanism module to accurately locate the position of rain streaks,and the rain streaks are extracted as the foreground information by combining the two parts of the network to guide the subsequent rain removal operation;Then the rain streaks is removed through the Contextual auto-encoder,combining with PatchGAN *** experimental results on two synthetic dataset and real-world rain image show that the network model proposed in this paper has high generalization ability under different rainfall *** improves the rain removal effect of the model on the most realistic public dataset,and improves the recovery ability of image details while effectively removing rain on other public datasets,which verifies the effectiveness of the model in improving the generalization ability and improving the image quality after rain *** the same time,the effect of rain removal is better than other methods on the real rain images,which proves that the method proposed in this paper has high practical application value.

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基于自适应ε截断策略的约束多目标优化算法

电子与信息学报 2016年第8期38卷 2047-2053页

作者：毕晓君张磊哈尔滨工程大学信息与通信工程学院哈尔滨150001

为提高约束多目标优化问题所求解集的分布性和收敛性,该文提出基于自适应ε截断策略的约束多目标优化算法。首先,自适应ε截断选择策略能够保留Parεto最优解和约束违反度及目标函数值均较优的不可行解,不仅提高了种群多样性,而且能够... 详细信息

为提高约束多目标优化问题所求解集的分布性和收敛性,该文提出基于自适应ε截断策略的约束多目标优化算法。首先,自适应ε截断选择策略能够保留Parεto最优解和约束违反度及目标函数值均较优的不可行解,不仅提高了种群多样性,而且能够较好地兼顾多样性和收敛性;其次,为增强算法的局部开发能力,在变异操作和交叉操作之后进行指数变异;最后,改进的拥挤密度估计方式只选择一部分Parεto最优解和距离较近的个体参与计算,不仅更加准确地反映解集的分布性,而且降低了计算量。通过在标准测试问题(CTP系列)上与其他4种优秀算法的对比结果可以得出,该算法所求解集的分布性和收敛性均得到一定提高,而且相较于对比算法在求解性能上具备一定的优势。

关键词：约束多目标优化约束处理技术 ε截断分布性收敛性

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改进TLBO的相关反馈图像检索方法

系统工程与电子技术 2017年第10期39卷 2359-2367页

作者：毕晓君潘铁文哈尔滨工程大学信息与通信工程学院黑龙江哈尔滨150001

针对当前基于进化算法的相关反馈图像检索方法无法很好地结合用户偏好信息和设置参数过多的问题,提出一种基于改进教与学优化的相关反馈图像检索方法。根据图像检索问题的特定环境,对教与学优化算法进行了一系列改进:首先,结合最近邻分... 详细信息

针对当前基于进化算法的相关反馈图像检索方法无法很好地结合用户偏好信息和设置参数过多的问题,提出一种基于改进教与学优化的相关反馈图像检索方法。根据图像检索问题的特定环境,对教与学优化算法进行了一系列改进:首先,结合最近邻分类法构造适应度函数的约束条件,使之更好地反映用户偏好信息;其次,通过在教阶段将相关图像集的中心图像作为教师以及在学阶段将相关图像作为学员学习的对象,使算法快速收敛到相关图像区域;最后,结合约束处理技术Deb准则进行学员的选择操作。将该算法与目前效果优异的3种基于进化算法的相关反馈技术在两套标准图像测试集上进行对比。结果表明,所提算法相较于另外3种算法具有明显的优势,能更好地结合用户偏好信息提高图像检索性能。

关键词：基于内容的图像检索相关反馈教与学优化算法 Deb准则