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Multi-Dimensional QoS Evaluation and Optimization of Mobile Edge Computing for IoT:A Survey

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Chinese Journal of Electronics 2024年第4期33卷 859-874页

作者： jiwei huang Fangzheng LIU Jianbing ZHANG Beijing Key Laboratory of Petroleum Data Mining China University of Petroleum Department of Computer Science and Technology China University of Petroleum

With the evolvement of the Internet of things(IoT), mobile edge computing(MEC) has emerged as a promising computing paradigm to support IoT data analysis and processing. In MEC for IoT, the differentiated requirements on quality of service(QoS) have been growing rapidly, making QoS a multi-dimensional concept including several attributes, such as performance, dependability, energy efficiency, and economic factors. To guarantee the QoS of IoT applications, theories and techniques of multi-dimensional QoS evaluation and optimization have become important theoretical foundations and supporting technologies for the research and application of MEC for IoT,which have attracted significant attention from both academia and industry. This paper aims to survey the existing studies on multi-dimensional QoS evaluation and optimization of MEC for IoT, and provide insights and guidance for future research in this field. This paper summarizes the multi-dimensional and multi-attribute QoS metrics in Io T scenarios, and then several QoS evaluation methods are presented. For QoS optimization, the main research problems in this field are summarized, and optimization models as well as their corresponding solutions are elaborated. We take notice of the booming of edge intelligence in artificial intelligence-empowered Io T scenarios, and illustrate the new research topics and the state-of-the-art approaches related to QoS evaluation and optimization. We discuss the challenges and future research directions.

关键词： Internet of things Mobile edge computing Quality of service Quality of service evaluation Quality of service optimization

A Stochastic Approach of Dependency Evaluation for IoT Devices

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Chinese Journal of Electronics 2016年第2期25卷 209-214页

作者： huang jiwei CHEN Guo CHENG Bo State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications

Internet of things(Io T) is an emerging technique that offers advanced connectivity of devices, systems, services, and human beings. With the rapid development of hardware and network technologies, the Io T can refer to a wide variety and large number of devices, resulting in complex relationships among Io T devices. The dependencies among Io T devices, which reflect their relationships, are with reference value for the design, development and management of Io T devices. This paper proposes a stochastic model based approach for evaluating the dependencies of Io T devices. A random walk model is proposed to describe the relationships of Io T devices, and its corresponding Markov chain is obtained for dependency analysis. A framework as well as schemes and algorithms for dependency evaluation in real-world Io T are designed based on traffic measurement. Simulation experiments based on real-life data extracted from smart home environments are conducted to illustrate the efficacy of the approach.

关键词： Internet of things(IoT) Dependency Random walk Markov chain

Hierarchical caches in content-centric networks： modeling and analysis

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Frontiers of Computer Science 2015年第6期9卷 846-859页

作者： Zixiao JIA jiwei huang Chuang LIN Department of Computer Science and Technology Tsinghua University Beijing 100084 China National Computer Network Emergency Response Technical Team/Coordination Center of China Beijing 100029 China

Content-centric network （CCN） is a new Inter- net architecture in which content is treated as the primitive of communication. In CCN, routers are equipped with con- tent stores at the content level, which act as caches for fre- quently requested content. Based on this design, the Internet is available to provide content distribution services without any application-layer support. In addition, as caches are inte- grated into routers, the overall performance of CCN will be deeply affected by the caching efficiency. In this paper, our aim is to gain some insights on how caches should be designed to maintain a high performance in a cost-efficient way. We try to model the two-layer cache hi- erarchy composed of CCN touters using a two-dimensional discrete-time Markov chain, and develop an efficient algo- rithm to calculate the hit ratios of these caches. Simulations validate the accuracy of our modeling method, and convey some meaningful information which can help us better un- derstand the caching mechanism of CCN.

关键词： CCN cache model analysis

Energy Efficient Speed Scaling and Task Scheduling for Distributed Computing Systems

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Chinese Journal of Electronics 2015年第3期24卷 468-473页

作者： huang jiwei LIN Chuang CHENG Bo State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Department of Computer Science and Technology Tsinghua University

With the rapid development of the performance of computer systems, energy consumption has been increasing dramatically as well. Energy efficiency has been paid much attention, especially in large-scale distributed computing systems. We propose an effective approach for energy reduction, by dynamic speed scaling and task scheduling simultaneously. Markov models for distributed computing systems are proposed, and detailed analyses of the models are provided. Markov decision processes(MDP) are applied for problem formulation, and MDP algorithms for obtaining the optimal solutions are introduced. The efficacy of our approach is further validated by simulation experiments.

关键词： Energy efficiency Speed scaling Task scheduling Markov decision process Distributed computing system

Modeling and Analysis of Data Dependencies in Business Process for Data-Intensive Services

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China Communications 2017年第10期14卷 151-163页

作者： yuze huang jiwei huang budan wu junliang chen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

With the growing popularity of data-intensive services on the Internet, the traditional process-centric model for business process meets challenges due to the lack of abilities to describe data semantics and dependencies, resulting in the inflexibility of the design and implement for the processes. This paper proposes a novel data-aware business process model which is able to describe both explicit control flow and implicit data flow. Data model with dependencies which are formulated by Linear-time Temporal Logic(LTL) is presented, and their satisfiability is validated by an automaton-based model checking algorithm. Data dependencies are fully considered in modeling phase, which helps to improve the efficiency and reliability of programming during developing phase. Finally, a prototype system based on j BPM for data-aware workflow is designed using such model, and has been deployed to Beijing Kingfore heating management system to validate the flexibility, efficacy and convenience of our approach for massive coding and large-scale system management in reality.

关键词： data-aware business process data-intensive services data dependency linear-time temporal logic(LTL) services computing

Association of *** hypoalbuminemia and survival in Chinese patients with metastatic renal cell carcinoma

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Chinese Journal of Cancer 2017年第7期36卷 315-325页

作者： Wen Cai Jin Zhang Yonghui Chen Wen Kong Yiran huang jiwei huang Lixin Zhou Department of Urology Renji Hospital School of Medicine Shanghai Jiao Tong University 160 Pujian Rd. Pudong District Shanghai 200127 P. R. China

Background:Hypoalbuminemia adversely affects the clinical outcomes of various *** purpose of this study was to estimate the prognostic value of hypoalbuminemia 3-5 weeks after treatment in patients with metastatic renal cell carcinoma(mRCC) who received sorafenib or sunitinib as first-line ***:In this single-center,retrospective study,we assessed the progression-free survival(PFS) and overall survival(OS) of 184 mRCC patients who received first-line sorafenib or sunitinib *** and OS were compared between patients with post-treatment hypoalbuminemia(post-treatment albumin level <36.4 g/L) and those with normal post-treatment albumin level(albumin level≥36.4 g/L).The Memorial Sloan Kettering Cancer Center(MSKCC)risk model stratified mRCC patients into three risk *** values of all patient characteristics including MSKCC risk category were determined by using univariate and multivariate Cox regression *** value was further determined using the Harrell concordance index and receiver operating characteristic curve ***:The median PFS and OS of the 184 patients were 11 months(95%confidence interval[CI]9-12 months)and 23 months(95%CI 19-33 months),*** with post-treatment hypoalbuminemia had significantly shorter median PFS(6 months[95%CI 5-7 months]) and OS(11 months[95%CI 9-15 months]) than patients who had normal post-treatment albumin levels(PFS:12 months[95%CI 11-16 months],P < 0.001;OS:31 months[95%CI24-42 months],P < 0.001),*** analysis showed that post-treatment hypoalbuminemia was an independent predictor of PFS(hazard ratio[HR],2.113;95%CI 1.390-3.212;P < 0.001) and OS(HR,2.388;95%CI 1.591-3.585;P < 0.001).Post-treatment hypoalbuminemia could also be combined with the MSKCC risk category for better prediction about *** model that included post-treatment hypoalbuminemia and MSKCC risk category improved the predictive accuracy for PFS and OS(c-index:

关键词： Metastatic renal cell carcinoma Post-treatment hypoalbuminemia Prognosis Tyrosine kinase inhibitors

Neoadjuvant and Adjuvant Therapy in Intrahepatic Cholangiocarcinoma

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Journal of Clinical and Translational Hepatology 2022年第3期10卷 553-563页

作者： Xing Chen Jinpeng Du jiwei huang Yong Zeng Kefei Yuan Department of Liver Surgery and Liver Transplantation Laboratory of Liver SurgeryState Key Laboratory of Biotherapy and Cancer CenterWest China HospitalSichuan University and Collaborative Innovation Center of BiotherapyChengduSichuanChina

Intrahepatic cholangiocarcinoma(ICC)is the second most common primary liver cancer and causes major economic and health burdens throughout the *** the incidence of ICC is relatively low,an upward trend has been seen over the past few *** to the lack of specific manifestations and tools for early diagnosis,most ICC patients have relatively advanced disease at ***,neoadjuvant therapy is necessary to evaluate tumor biology and downstage these patients so that appropriate candidates can be selected for radical liver ***,even after radical resection,the recurrence rate is relatively high and is a main cause leading to death after surgery,which makes adjuvant therapy *** of its low incidence,studies in both neoadjuvant and adjuvant settings of ICC are lagging compared with other types of *** standard neoadjuvant and adjuvant regimens are not available in the current guidelines due to a lack of high-level evidence,some progress has been achieved in recent *** this review,the available literature on advances in neoadjuvant and adjuvant strategies in ICC are evaluated,and possible challenges and opportunities for clinical and translational investigations in the near future are discussed.

关键词： Intrahepatic cholangiocarcinoma Neoadjuvant therapy Adjuvant therapy Recurrence Liver resection Liver transplant

Cost-Efficient Edge Caching for NOMA-Enabled IoT Services

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China Communications 2024年第8期21卷 182-191页

作者： Chen Ying Xing Hua Ma Zhuo Chen Xin huang jiwei School of Computer Science Beijing Information Science and Technology UniversityBeijing 100101China Beijing Key Laboratory of Petroleum Data Mining China University of PetroleumBeijing 102249China

Mobile edge computing(MEC)is a promising paradigm by deploying edge servers(nodes)with computation and storage capacity close to IoT *** Providers can cache data in edge servers and provide services for IoT devices,which effectively reduces the delay for acquiring *** the increasing number of IoT devices requesting for services,the spectrum resources are generally *** order to effectively meet the challenge of limited spectrum resources,the Non-Orthogonal Multiple Access(NOMA)is proposed to improve the transmission *** this paper,we consider the caching scenario in a NOMA-enabled MEC *** the devices compete for the limited resources and tend to minimize their own *** formulate the caching problem,and the goal is to minimize the delay cost for each individual device subject to resource *** reformulate the optimization as a non-cooperative game *** prove the existence of Nash equilibrium(NE)solution in the game ***,we design the Game-based Cost-Efficient Edge Caching Algorithm(GCECA)to solve the *** effectiveness of our GCECA algorithm is validated by both parameter analysis and comparison experiments.

关键词： caching cost Internet of Things mobile edge computing non-orthogonal multiple access

LSD1 inhibition suppresses the growth of clear cell renal cell carcinoma via upregulating P21signaling

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Acta Pharmaceutica Sinica B 2019年第2期9卷 324-334页

作者： Liangsong Zhu Jianfeng Wang Wen Kong jiwei huang Baijun Dong Yiran huang Wei Xue Jin Zhang Department of Urology Ren Ji Hospital School of Medicine Shanghai Jiaotong University

Histone lysine-specific demethylase 1(LSD1) has been implicated in the disease progression of several types of solid tumors. This study provides the first evidence showing that LSD1 overexpression occurred in 62.6%(224/358) of clear cell renal cell carcinomas(ccRCC). LSD1 expression was associated with the progression of ccRCC, as indicated by TNM stage(P ? 0.006), especially tumor stage(P ? 0.017) and lymph node metastasis(P ? 0.030). High LSD1 expression proved to be an independent prognostic factor for poor overall survival(Po0.001) and recurrence-free survival(Po0.001) of ccRCC patients. We further show that LSD1 inhibition by siRNA knockdown or using the small molecule inhibitor SP2509 suppressed the growth of ccRCC in vitro and in vivo. Mechanistically, inhibition of LSD1 decreased the H3 K4 demethylation at the CDKN1 A gene promoter, which was associated with P21 upregulation and cell cycle arrest at G1/S in ccRCC cells. Our findings provide new mechanistic insights into the role of LSD1 in cc RCC and suggest the therapeutic potential of LSD1 inhibitors in ccRCC treatment.

关键词： Clear cell renal cell carcinoma LSD1 Prognosis Proliferation P21