An Effective Framework for Contented-Based Image Retrieval with Multi-Instance Learning Techniques

Peng, Yu,Wei, Kun-Juan,Zhang, Da-Li The Institute of Electronics and Information Engin 2007 JUCT : Journal of Ubiquitous Convergence Technolog Vol.1 No.1

Multi-Instance Learning(MIL) performs well to deal with inherently ambiguity of images in multimedia retrieval. In this paper, an effective framework for Contented-Based Image Retrieval(CBIR) with MIL techniques is proposed, the effective mechanism is based on the image segmentation employing improved Mean Shift algorithm, and processes the segmentation results utilizing mathematical morphology, where the goal is to detect the semantic concepts contained in the query. Every sub-image detected is represented as a multiple features vector which is regarded as an instance. Each image is produced to a bag comprised of a flexible number of instances. And we apply a few number of MIL algorithms in this framework to perform the retrieval. Extensive experimental results illustrate the excellent performance in comparison with the existing methods of CBIR with MIL.

신흥 기술의 단계적 벤치마킹을 위한 와 SOM, DEA AHP 방법의 순차 활용

( Peng Yu ),( Jang Hee Lee ) 한국지식경영학회 2012 지식경영연구 Vol.13 No.5

Emerging technologies have significant implications in establishing competitive advantages and are characterized by continuous rapid development. Efficient benchmarking is more and more important in the development of emerging technologies. Similar input level and importance are two necessary criteria need to be considered for emerging technology`s benchmarking. In this study, we proposed a sequential use of self-organizing map(SOM), data envelopment analysis(DEA) and analytical hierarchy process(AHP) method for the stepwise benchmarking of emerging technology. The proposed method uses two-level SOM to cluster the emerging technologies with similar required input levels together, then, in each cluster, uses DEA-BCC model to evaluate the efficiencies of the emerging technologies and do tier analysis to form tiers. On each tier, AHP rating method is used to calculate each emerging technology`s importance priority. The optimal benchmarking path of each cluster is established by connecting the emerging technologies with the highest importance priority. In order to validate the proposed method, we apply it to a case of biotechnology. The result shows the proposed method can overcome difficulties in benchmarking, select suitable benchmarking targets and make the benchmarking process more efficient and reasonable.

Low-Complexity Energy Efficient Base Station Cooperation Mechanism in LTE Networks

( Peng Yu ),( Lei Feng ),( Zifan Li ),( Wenjing Li ),( Xuesong Qiu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.10

Currently Energy-Saving (ES) methods in cellular networks could be improved, as compensation method for irregular Base Station (BS) deployment is not effective, most regional ES algorithm is complex, and performance decline caused by ES action is not evaluated well. To resolve above issues, a low-complexity energy efficient BS cooperation mechanism for Long Time Evolution (LTE) networks is proposed. The mechanism firstly models the ES optimization problem with coverage, resource, power and Quality of Service (QoS) constraints. To resolve the problem with low complexity, it is decomposed into two sub-problems: BS Mode Determination (BMD) problem and User Association Optimization (UAO) problem. To resolve BMD, regional dynamic multi-stage algorithms with BS cooperation pair taking account of load and geographic topology is analyzed. And then a distributed heuristic algorithm guaranteeing user QoS is adopted to resolve UAO. The mechanism is simulated under four LTE scenarios. Comparing to other algorithms, results show that the mechanism can obtain better energy efficiency with acceptable coverage, throughput, and QoS performance.

网络语境下拼音字符呈现的类型、特点及语用意义

PENG YU 한국중국언어학회 2022 중국언어연구 Vol.- No.98

In recent years, it is more and more common that Chinese characters and Chinese phonetic characters are mixed in the network.The usage has broken the common rules of Chinese written language to some extent. The reason why this usage can be generally recognized and spread rapidly that it must have pragmatic functions that are difficult to achieve by inherent expressions.This paper tries to sort out the types of Chinese phonetic characters in network from the aspects of text exporter, receiver and network context, and summarizes the characteristics on this basis,then have made a pragmatic analysis of this phenomenon by combining relevance theory, conversational implicature theory and politeness principle in pragmatics. 近年来网络语言中拼音字符与汉字混合使用的现象越来越普遍,如2021年网络十大流行词语中就收录了“YYDS”一词。汉字文本中混入拼音字符在某种程度上打破了汉语书面语的常见规则,这种用法之所以能得到人们的普遍认同,并在网络上迅速传播,说明其具有传统表达方式难以实现的语用功能。本研究即是在对这一现象进行充分调查的基础上展开的。拟从文本输出者、接收者和网络语境几个方面入手,梳理网络拼音字母词的类型,在此基础上总结归纳其特点,并结合语用学中的合作原则、会话含义理论以及关联理论等对这一现象进行语用分析。

기술 평가 및 선정을 위한 AHP와 DEA 통합 활용 방법: 청정기술에의 적용

( Peng Yu ),( Jang Hee Lee ) 한국지식경영학회 2012 지식경영연구 Vol.13 No.3

data envelopment analysis-assurance region, analytical hierarchy process (AHP), technology selection Selecting promising technology is becoming more and more difficult due to the increased number and complexity. In this study, we propose hybrid AHP/DEA-AR method and hybrid AHP/DEA-AR-G method to evaluate efficiency of technology alternatives based on ordinal rating data collected through survey to technology experts in a certain field and select efficient technology alternative as promising technology. The proposed method normalizes rating data and uses AHP to derive weights to improve the credibility of analysis, then in order to avoid basic DEA models` problems, use DEA-AR and DEA-AR-G to evaluate efficiency of technology alternatives. In this study, we applied the proposed methods to clean technology and compared with the basic DEA models. According to the result of the comparison, we can find that the both proposed methods are excellent in confirming most efficient technology, and hybrid AHP/DEA-AR method is much easier to use in the process of technology selection.

Static Stability Analysis of Single-Layer Reticulated Spherical Shell with Kiewitt-Sunflower Type

Peng Yu,Weijing Yun,Stéphane Bordas,Sheng He,Yiming Zhou 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5

In this study, we use a large-scale parameter analysis and linear regression method to characterize the static stability of Kiewitt-sunfl ower-type single-layer reticulated spherical shell. Based on more than 15,000 numerical cases of elastic–plastic load–displacement process, and the investigations on the infl uence of buckling and instability mode, rise-span and ringnumbers ratio, effi ciency of the structure, load distribution, support conditions, size of the initial geometric imperfection and distribution patterns are proceeded. We summarize the key eff ect for stable performance of structure, and develop the formulation to calculate the ultimate capacity of stability. The results show that Kiewitt-sunfl ower type single-layer reticulated spherical shell is sensitive to defect, and diff erent distribution patterns of geometry defect lead to diff erent structural buckling. The ultimate stability bearing capacity can be improved by increasing the rise-span and ring-numbers ratio. The asymmetrical load distribution has little eff ect on the stability. The most unfavorable eigenmode is arbitrary, and it is generally not the lowest order. We summarize the key eff ect for stable performance of structure, and develop the formulation to calculate the ultimate capacity of stability.

Rightward Movement: A Stylistic Feature of Chinese and Korean EEL Users

Peng Yu 한국중원언어학회 2019 언어학연구 Vol.0 No.51

This paper delves into two aspects of Rightward Movement: Heavy-NP-Shift and Extraposition from NP, and examines their absence in the discourse of Korean and Chinese EFL users. I argue that Rightward Movement is a language habit of native English speakers, to whom it is natural and unnoticeable, and is often used subconsciously, but the absence of it is a stylistic feature of EFL users. I prove it via a survey among 388 Chinese and Korean EFL users. It is shown that Chinese and Korean students and teachers are poor at the cognition of Rightward Movement, and do not have a tendency to move rightward the long and heavy elements. This is attributable to the following reasons. First, they learn English in a different manner from native speakers. Second, EFL teachers are not fully aware of teaching Rightward Movement. Third, the grammar books written for Chinese and Korean EFL learners rarely describe Rightward Movement of our concern. These elements are seen to lead to the absence of Rightward Movement in the discourse of Chinese and Korean EFL users, subsequently resulting in a stylistic feature of EFL users.

Effect of Initial Indentation Position on Plastic Deformation Behaviors of Polycrystalline Materials via Molecular Dynamics Simulation

Pengyue Zhao,Yongbo Guo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1

Polycrystalline materials can be divided into four types of microstructural components, including grain cell (GC), grain boundary (GB), triple junction (TJ) and vertex points (VP). Nanoindentation at different microstructural components on the polycrystalline materials surface can lead to different plastic deformation behaviors of the polycrystalline materials. Due to experimental limitations, the indentation-induced internal stress and defect evolution process are difficult to investigate directly, especially for the polycrystalline materials with grain size less than 100 nm. The molecular dynamics (MD) simulations were performed to unravel the initial indentation position effect on the elasticity/plastic deformation mechanism of polycrystalline copper. The results reveal that the initial indentation position governs the indentation force variation and defect distribution range due to the different dimensionalities of the microstructural components. The defect propagation as well as the internal stress transmission in the GC regions tend to transfer to the low-dimensional microstructural components of the interfaces. In addition, the atomic internal stress and potential energy accumulation/release of the microstructural component atoms during the nanoindentation process are also investigated, revealing that the atomic internal stress and potential energy in the VPs vary earliest, followed by the TJs, GBs and GCs.

Assembly mechanisms of soil bacterial communities in subalpine coniferous forests on the Loess Plateau, China

Pengyu Zhao,Jinxian Liu,Tong Jia,Zhengming Luo,Cui Li,Bao-Feng Chai 한국미생물학회 2019 The journal of microbiology Vol.57 No.6

Microbial community assembly is affected by trade-offs between deterministic and stochastic processes. However, the mechanisms underlying the relative influences of the two processes remain elusive. This knowledge gap limits our ability to understand the effects of community assembly processes on microbial community structures and functions. To better understand community assembly mechanisms, the community dynamics of bacterial ecological groups were investigated based on niche breadths in 23 soil plots from subalpine coniferous forests on the Loess Plateau in Shanxi, China. Here, the overall community was divided into the ecological groups that corresponded to habitat generalists, ‘other taxa’ and specialists. Redundancy analysis based on Bray-Curtis distances (db-RDA) and multiple regression tree (MRT) analysis indicated that soil organic carbon (SOC) was a general descriptor that encompassed the environmental gradients by which the communities responded to, because it can explain more significant variations in community diversity patterns. The three ecological groups exhibited different niche optima and degrees of specialization (i.e., niche breadths) along the SOC gradient, suggesting the presence of a gradient in tolerance for environmental heterogeneity. The inferred community assembly processes varied along the SOC gradient, wherein a transition was observed from homogenizing dispersal to variable selection that reflects increasing deterministic processes. Moreover, the ecological groups were inferred to perform different community functions that varied with community composition, structure. In conclusion, these results contribute to our understanding of the trade-offs between community assembly mechanisms and the responses of community structure and function to environmental gradients.

Band Gap Modulation of Lead Sulfide QDs

Pengyu Zeng,Wei Li,Yun Zhao,Mengting Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.6

Lead sulfide quantum dots (QDs) were prepared by liquid phase method. The particle size can be controlled by changing the concentration of reactants and surfactant and the size of the QDs varies from 7 nm to 20 nm, which results in the change of the optical properties and the band gap of the particles. The optical band gap of lead sulfide QDs increased drastically with the decrease of the diameter of the sample QDs.