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Integrating transcriptomic and proteomic analyses of photoperiod-sensitive in near isogenic maize line under long-day conditions

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Journal of Integrative Agriculture 2019年第6期18卷 1211-1221页

作者： SONG xiao-heng TIAN Lei WANG Shun-xi ZHOU jin-long ZHANG Jun CHEN Zan WU Liu-ji KU Li-xia CHEN Yan-hui College of Agronomy Henan Agricultural University/Synergetic Innovation Center of Henan Grain Crops/Key Laboratory of Physiological Ecology and Genetic Improvement of Food Crops in Henan ProvinceZhengzhou 450002P.R.China Henan Academy of Agricultural Science Zhengzhou 450002P.R.China

As a short-day plant species, maize requires an optimal photoperiod for inducing reproductive growth. However, there is a lack of information regarding photoperiod-induced changes in maize mRNA and protein levels. In this study, a photoperiod-insensitive maize inbred line and its near isogenic photoperiod-sensitive line were used. By integrating RNAbased transcriptomic and iTRAQ LC-MS/MS-based proteomic approaches, we generated a comprehensive inventory of the transcripts and proteins with altered abundances in response to a long photoperiod(LP) during growth stage transitions. We detected 22 000 transcripts in RNA-sequence runs and 5 259 proteins from an iTRAQ-based analysis. A weak correlation between mRNA-and protein-level changes was observed, suggesting the LP-induced transition between maize growth stages is largely regulated post-transcriptionally. Differentially expressed genes influenced by LP conditions were associated with several regulatory processes in both maize inbred lines, especially phosphate ion transport and the circadian rhythm. Additionally, 31 transcripts and six proteins related to photoperiodic flowering in maize were identified by comparing transcriptomic and proteomic data. This transcriptomic and proteomic analysis represents the first comprehensive and comparative study of gene/protein-level changes occurring in photoperiod-sensitive and-insensitive maize inbred lines during growth stage transitions under LP conditions.

关键词： development transition long photoperiod near isogenic line proteome transcriptome

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Preparation and photochromic properties of pyrazolones/polyvinyl alcohol composite films

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Chinese Chemical Letters 2017年第2期28卷 280-284页

作者： ji-xi Guo Ming-xi Guo Dian-Zeng jia Yin-Hua Li Key Laboratory of Energy Materials Chemistry Ministry of Education Key Laboratory of Advanced Functional Materials Autonomous Region Institute of Applied Chemistry Xinjiang University Urumqi 830046 China

Novel photochromic composite films have been successfully fabricated by dispersing pyrazolone derivative：1,3-Diphenyl-4-（3-chlorobenzal）-5-hydroxypyrazole 4-phenylsemicarbazone（la） into hydrosol of polyvinyl alcohol（PVA）.The microstructure,photochromic behaviors and thermal bleaching properties were investigated by Raman spectroscopy,X-ray powder diffraction（XRD）,field emission scanning electron microscopy（FE-SEM） and ultraviolet-visible absorption spectroscopy（UV-vis）.The results showed that la was not only blended but also well dispersed in the PVA polymer films with a suitable content of *** UV light irradiation,the composite films gradually changed from colorless to yellow and recovered fully to the initial state upon thermal *** time constants of photochromic reactions were almost the same as those of la observed in their crystalline state,indicating that the photochromic phenomenon is barely disturbed by the polymer matrix.

关键词： Pyrazolone Polyvinyl alcohol Composite film Photochromism Information storage

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Coalition-based downlink resource allocation for LTE system with divide-and-conquer approach

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The Journal of China Universities of Posts and Telecommunications 2012年第6期19卷 1-5页

作者： GAO xiang LI xi ji Hong LI Yi Key Laboratory of Universal Wireless Communications Ministry of EducationBeijing University of Posts and Telecommunications

To take advantage of the multiuser diversity resulted from the variation in channel conditions among the users, it has become an interesting and challenging problem to efficiently allocate the resources such as subcarriers, bits, and power. Most of current research concentrates on solving the resource-allocation problem for all users together in a centralized way, which brings about high computational complexity and makes it impractical for real system. Therefore, a coalitional game framework for downlink multi-user resource allocation in long term evolution （LTE） system is proposed, based on the divide-and-conquer idea. The goal is to maximize the overall system data rate under the constraints of each user＇s minimal rate requirement and maximal transmit power of base station while considering the fairness among users. In this framework, a coalitional formation algorithm is proposed to achieve optimal coalition formation and a two-user bargaining algorithm is designed to bargain channel assignment between two users. The total computational complexity is greatly reduced in comparison with conventional methods. The simulation results show that the proposed algorithms acquire a good tradeoff between the overall system throughout and fairness, compared to maximal rate and max-min schemes.

关键词： LTE resource allocation divide-and-conquer coalitional game bargaining solution

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Multi-user selection based on particle swarm optimization and power control scheme in the uplink CoMP-MU-MIMO system

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The Journal of China Universities of Posts and Telecommunications 2013年第5期20卷 79-84页

作者： LIU jian LI xi ji Hong ZHANG xiao-liang School of Telecommunication Engineering Beijing University of Posts and Telecommunications

Orthogonal frequency division multiplexing （OFDM） which has been adopted in the long-term evolution （LTE） system can improve the system capacity obviously. However, it also brings about severe inter-cell interference （ICI） for cell-edge users （CEUs）. To tackle this problem, multi-user selection and power control （MuS-PC） is proposed as an efficient scheme in uplink coordinated multi-point multi-user multi-input multi-output （CoMP-MU-MIMO） transmission/reception. This paper jointly considers user＇s signal to interference plus noise ratio （S1NR） and proportional fairness （PF） to maximize the total channel capacity in multi-user selection by formulating a penalty function. To simplify the penalty function＇s computation, particle swarm optimization （PSO） algorithm is introduced. In addition, power control is adopted to maximize overall energy efficiency. Simulation results demonstrate that the MuS-PC scheme can not only obtain the optimal total channel capacity while guarantee each user＇s quality of service （QoS） and PF, but also largely reduce computational complexity and improve energy efficiency. As a result, the poor communication quality of CEUs can be enhanced.

关键词： CoMP-MU-MIMO system PSO algorithm penalty ftmction multi-user selection power control zero forcing (ZF) equalization

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Multi-path routing based on load-balance for cognitive packet networks

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The Journal of China Universities of Posts and Telecommunications 2011年第5期18卷 71-75页

作者： CHEN Liang ji Hong LI Yi LI xi College of Information and Commumieation Engineering Beijing University of Posts and Telecommunications Beijing 100876 China

Quality of service （QoS） routing algorithms have been hardly discussed in the scientific community, most previous work on QoS routing concentrates on the performance of the single route. Cognitive packet network （CPN） has been designed for providing QoS routing. In this paper, to balance the loads among networks, we present a multi-path routing algorithm based on load-balance （MPRLB）, which is carried out in two steps. The algorithm with low computational complexity is firstly applied to establish multi path routing for each source and destination node pairs （SD-pair） nodes in the network. Then, we propose the hopfield neural network algorithm, which is applied to improve the efficiency of the flow deviation method for fast flow allocation among the links of the network based on load balance. Extensive simulation results demonstrate that the proposed scheme significantly improves the performance compared with the existing scheme that ignores load balancing.

关键词： hopfield neural network CPN multi-path routing

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Preparation of magnetic polybutylcyanoacrylate nanospheres encapsulated with aclacinomycin A and its effect on gastric tumor

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World Journal of Gastroenterology 2004年第14期10卷 2010-2013页

作者： HongGao ji-YaoWang xi-ZhongShen Yong-HuiDeng WeiZhang DepartmentofGastroenterology ZhongshanHospitalFudanUniversityShanghai200032China DepartmentofMacromolecularSciences FudanUniversityShanghai200032China DepartmentofGastroenterology HuadongHospitalShanghai200040China

AIM: To evaluate the effect of aclacinomycin A-loaded magnetic polybutylcyanoacrylate nanoparticles on gastric tumor growth in vivo and in ***: Magnetic polybutylcyanoacrylate (PBCA)nanospheres encapsulated with aclacinomycin A (MPNS-ACM) were prepared by interracial polymerization. Particle size, shape and drug content were examined. Female BABL/c nude mice were implanted with MKN-45 gastric carcinoma tissues subcutaneously to establish human gastric carcinoma model. The mice were randomly divided into 5 groups of 6 each: ACM group (8 mg/kg bin); group of high dosage of MPNS-ACM (8 mg/kg bin); group of low dosage of MPNS-ACM (1.6 mg/kg bin); group of magnetic PBCA nanosphere (MPNS) and control group(normal saline). Magnets (2.5 T) were implanted into the tumor masses in all of the mice one day before the ***-mentioned drugs were administered intravenously to the mice of every group on the first day and sixth *** the mice were sacrificed, tumor weight was measured, and the assay of granulocyte- macrophage colony forming-unit (CFU-GM) was performed on semi-solid culture. White blood cell, alanine aminotransferase and creatine were examined. 3-[4-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) was used to examine the viability of MKN-45 cells afger incubation with different concentrations of ACM, MPNS and MPNS-ACM suspension respectively for 48 ***: Content of ACM in MPNS-ACM was 12.0% and the average diameter of the particles was 210 nm. The inhibitory rates of ACM (8 mg/kg bin), high dosage of MPNS-ACM (8 mg/kg bin), low dosage of MPNS-ACM (1.6 mg/kg bin)and MPNS on human gastric carcinoma in nude mice were 22.63%, 52.55%, 30.66% and 10.22%, respectively. There was a significant decrease in the number of CFU-GM of bone marrow in ACM group compared with control group,whereas no obvious change was observed in that of the nanosphere groups. The values of 50% inhibition concentration (IC50) of ACM, MPNS and MPNS-ACM were 0.09,

关键词：聚丁烯氰丙烯酸酯胶囊阿克拉霉素A 胃癌肿瘤

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Traffic-based queue-aware scheduling for 3GPP LTE system

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The Journal of China Universities of Posts and Telecommunications 2014年第2期21卷 63-68页

作者： WANG Ke LI xi ji Hong MA Ze-wen Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications

Although the medium access control （MAC） signaling has been well-defined in the 3rd generation partnership project （3GPP） long term evolution （LTE） specifications, the scheduling algorithm crucial to guarantee QoS performance, still remains as open issues. In this article, a traffic-based queue-aware scheduling （TQS） algorithm is proposed for evolved nodeB＇s （eNB＇s） MAC scheduler in 3GPP LTE broadband wireless networks. The proposed TQS is divided into three sub-algorithms： firstly, the authors propose a traffic model construction （TMC） algorithm which can construct a discrete-time Markov-modulated Poisson process （dMMPP） to represent each flow. Secondly, a newly traffic state estimation （TSE） algorithm is designed to obtain the queue＇s analytical statistics. Thirdly, based on the derived results of TSE and the channel states, a scheduling action decision （SAD） algorithm is presented that can adaptively allocate bandwidth to flows by considering both queue states and spectrum efficiency. Simulation shows that the TMC and TSE algorithm can capture the fluctuation of traffic and queue accurately. Moreover, compared with a widely accepted traffic-based scheduling algorithm, the proposed TQS has better average queue length and overflow probability performance.

关键词： MAC scheduling queue analysis dMMPP

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Buffer-aware resource scheduling scheme for LTE-A uplink relay-assisted network

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The Journal of China Universities of Posts and Telecommunications 2013年第6期20卷 30-35页

作者： TANG Yi-wen LI xi ji Hong LIU jian School of Telecommunication Engineering Beijing University of Posts and Telecommunications

Due to the constraint of single carrier frequency division multiple access （SC-FDMA） adopted in long term evolution （LTE） uplink, subcarriers allocated to single user equipment （UE） must be contiguous. This contiguous allocation constraint limits resource allocation flexibility and makes the resource scheduling problem more complex. Most of the existing work cannot well meet UE＇s quality of service （QoS） requirement, because they just try to improve system performance mainly based on channel condition or buffer size. This paper proposes a novel resource scheduling scheme considering channel condition, buffer size and packet delay when allocating frequency resource. Firstly, optimization function is formulated, which aims to minimize sum of weight for bits still left in UE buffer after each scheduling slot. QoS is the main concern factor here. Then, to get packet delay information, this paper proposes a delay estimation algorithm. Relay node （RN） is introduced to improve overall channel condition. Specific RN selection strategy is also depicted in the scheme. Most important of all, a creative negotiation mechanism is included in the subcarrier allocation process. It can improve the overall system throughput performance in guarantee of user＇s QoS requirement. Simulation results demonstrate that the scheme can greatly enhance system performance like delay, throughput and jitter.

关键词： SC-FDMA relay scheduling LTE-A MBDF BDF-PF

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Blockchain-based collaborative edge caching scheme for trustworthy content sharing

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The Journal of China Universities of Posts and Telecommunications 2021年第2期28卷 38-47页

作者： Zhou Yutong Li xi ji Hong Zhang Heli Key Laboratory of Universal Wireless Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

Moving data from cloud to the edge network can effectively reduce traffic burden on the core network,and edge collaboration can further improve the edge caching capacity and the quality of service(QoS).However,it is difficult for various edge caching devices to cooperate due to the lack of trust and the existence of malicious *** this paper,blockchain which has the distributed and immutable characteristics is utilized to build a trustworthy collaborative edge caching scheme to make full use of the storage resources of various edge *** collaboration process is described in this paper,and a proof of credit(PoC)protocol is proposed,in which credit and tokens are used to encourage nodes to cache and transmit more content in honest *** nodes will pay for their malicious actions such as tampering or deleting cached *** each node chooses strategy independently to maximize its benefits in an environment of mutual influence,a non-cooperative game model is designed to study the caching behavior among edge *** existence of Nash equilibrium(NE)is proved in this game,so the edge server(ES)can choose the optimal caching strategy for all collaborative devices,including itself,to obtain the maximum *** results show that the system can save mining overhead as well as organize a trusted collaborative edge caching effectively.

关键词： caching blockchain collaborative edges consensus mechanism game theory

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Design and experimental verification of a new multi-functional bridge seismic isolation bearing

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第12期13卷 904-914页

作者： Chen-xi xiNG Hao WANG Ai-qun LI ji-rong WU MOE Key Laboratory of Concrete and Prestressed Concrete Structures Southeast UniversityNanjing 210096China

A new multi-functional bridge seismic isolation bearing(MFBSIB) is designed and its mechanical model is developed in this *** an upper sliding device and a lower energy dispassion isolation device effectively,the new MFBSIB can adjust the deformation caused by temperature,vehicle breaks,and concrete creep,etc.,in addition to dissipating *** switch of 'slide-isolation' is achieved and the efficiency of both upper and lower parts is validated through experiment with a *** shear performance curve established in this paper is verified to be efficient in describing the mechanical characteristics of the bearing through *** is proved through both numerical calculation and experimental analysis that the new MFBSIB is endowed with enough vertical rigidity,good energy dissipation ability,stable overall performance,and good realization in expected *** performance is slightly influenced by shear stress,while affected by vertical pressure,loading frequency,slide limit,etc.,*** results could provide reference for study and application of the new MFBSIB.

关键词： Seismic isolation bearing Sliding device Finite element analysis Model experiment Bridge

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