China's Biodiversity and Conservation : A View from Entomologists

(Yanru Wu),(Decheng Yuan) 고려대학교 한국곤충연구소 1993 생물다양성 보존을 위한 국제심포지움 Vol.- No.-

Sodium Alginate-Assisted Synthesis of PdAg Bimetallic Nanoparticles and their Enhanced Activity for Electrooxidation of Ethanol

Yanru Yin,Changna Wen,Ning Ma,Baoyan Wang,Lianying Zhang,Hongliang Li,Peizhi Guo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.9

Palladium and palladium-silver bimetallic nanocrystals have been synthesized hydrothermally by using environmental-friendly sodium alginate as the stabilizer and reducing agent. The pure palladium nanoparticles were spherical-like possibly due to the principle of the lowest surface energy, however, the formation of bimetallic palladium-silver nanoparticles was much more complicated, which was thinner and more irregular nanostructures than pure palladium nanoparticles. Electrochemical measurements showed that the electrocatalytic activity toward ethanol oxidation was increased first with the increase of silver content in bimetallic nanoparticles, from pure palladium of around 1070 mA/mg, to PdAg-20 of 1160 mA/mg and to PdAg-10 of 1750 mA/mg, and declined greatly at a high content of silver, approximately 279 mA/mg. Electrochemical stability test showed that PdAg-10 and PdAg-5 were the best and worst among four palladium-based samples, respectively. Based on the experimental data, the formation mechanism of pure palladium and palladium-silver bimetallic nanoparticles and the structure-property relationship of these samples have been discussed.

Diamine-linked array of metal (Au, Ag) nanoparticles on glass substrates for reliable surface-enhanced Raman scattering (SERS) measurements

Yanru Bu,박상준,이상화 한국물리학회 2014 Current Applied Physics Vol.14 No.5

Metal (Au, Ag) nanoparticles (M NPs) (ca. 30e40 nm) prepared by citrate reduction method were arrayed on amine-terminated glass substrates using diamine linkers with different chain lengths. 1,4-diaminobutane (C-4 diamine) produced the uniform and densely-packed array of M NPs on glass substrates at appropriate concentration ranges, whereas diamine linkers with longer chain lengths (C-8 and C-12 diamines) produced more heterogeneous and aggregated array of M NPs. When compared to Ag NPs, Au NPs demonstrated more controllable and higher packing density due to their mono-dispersed size and higher affinity to diamine linkers. Uniformly arrayed M NPs (Au, Ag) on glass substrates exhibited high enhancement factors in SERS measurements of o-chlorothiophenol probes. Au NPs arrayed substrates exhibited an approximate power-law linearity of Raman intensity with probe concentrations (from 107 M to 104 M), demonstrating more reliable SERS substrates than Ag arrayed substrates with higher SERS activity.

The protective effect of procyanidinson tert-butyl hydroperoxide induced human hepatocyte HL7702 cell injury

Yanru Li,Hua Zhang,Guohui Lu 한국통합생물학회 2015 Animal cells and systems Vol.19 No.6

The present study aims to investigate the mechanism of the protective action of Procyanidins (PC) against tertiary butyl hydroperoxide (TBHP)-induced cytotoxicity and cell death in human hepatocyte-derived cell line HL7702 cells. Incubation of HL7702 cells with PC prevented TBHP-induced loss in cell viability and reduction in GSH/GSSG ratio and activities of antioxidant enzymes have also been found to be prevented by PC.Western blot was used to evaluate the levels of cytochrome c, Bcl-2, Bax, Sirt3 and IDH2. The results showed that PC effectively protect TBHP-treated HL7702 cells from death, and increase superoxide dismutase activity and significantly decrease malondialdehyde production. PC increased the ratio of GSH/GSSG and NADPH/NADP+, and reduced the release of cytochrome c from mitochondria and decreased the Bax expression, and also increased the expression of Bcl-2, IDH2 and Sirt3. PC prevented TBHP-induced oxidative stress injury in HL7702 cells and functioning via Sirt3-dependent mitochondria pathways.

DSLA: Dynamic Sampling Localization Algorithm Based on Virtual Anchor Node

( Yanru Chen ),( Bingshu Yan ),( Liangxiong Wei ),( Min Guo ),( Feng Yin ),( Qian Luo ),( Wei Wang ),( Liangyin Chen ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.10

Compared with the localization methods in the static sensor networks, node localization in dynamic sensor networks is more complicated due to the mobility of the nodes. Dynamic Sampling Localization Algorithm Based on Virtual Anchor (DSLA) is proposed in this paper to localize the unknown nodes in dynamic sensor networks. Firstly, DSLA algorithm predicts the speed and movement direction of nodes to determine a sector sampling area. Secondly, a method of calculating the sampling quantity with the size of the sampling area dynamically changing is proposed in this paper. Lastly, the virtual anchor node, i.e., the unknown node that got the preliminary possible area (PLA), assists the other unknown nodes to reduce their PLAs. The last PLA is regarded as a filtering condition to filter out the conflicting sample points quickly. In this way, the filtered sample is close to its real coordinates. The simulation results show that the DSLA algorithm can greatly improve the positioning performance when ensuring the execution time is shorter and the localization coverage rate is higher. The localization error of the DSLA algorithm can be dropped to about 20%.

Social Network Aware Device-to-Device Communication in Wireless Networks

Yanru Zhang,Pan, Erte,Lingyang Song,Saad, Walid,Dawy, Zaher,Zhu Han IEEE 2015 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.14 No.1

<P>Device-to-device (D2D) communication is seen as a major technology to overcome the imminent wireless capacity crunch and to enable new application services. In this paper, a novel social-aware approach for optimizing D2D communication by exploiting two layers, namely the social network layer and the physical wireless network layer, is proposed. In particular, the physical layer D2D network is captured via the users' encounter histories. Subsequently, an approach, based on the so-called Indian Buffet Process, is proposed to model the distribution of contents in the users' online social networks. Given the social relations collected by the base station, a new algorithm for optimizing the traffic offloading process in D2D communications is developed. In addition, the Chernoff bound and approximated cumulative distribution function (cdf) of the offloaded traffic are derived and the validity of the bound and cdf is proven. Simulation results based on real traces demonstrate the effectiveness of our model and show that the proposed approach can offload the network's traffic successfully.</P>

Contract-Based Incentive Mechanisms for Device-to-Device Communications in Cellular Networks

Yanru Zhang,Lingyang Song,Saad, Walid,Dawy, Zaher,Zhu Han IEEE 2015 IEEE journal on selected areas in communications Vol.33 No.10

<P>Device-to-device (D2D) communication is viewed as one promising technology for boosting the capacity of wireless networks and the efficiency of resource management. D2D communication heavily depends on the participation of users in sharing contents. Thus, it is imperative to introduce new incentive mechanisms to motivate such user involvement. In this paper, a contract-theoretic approach is proposed to solve the problem of providing incentives for D2D communication in cellular networks. First, using the framework of contract theory, the users' preferences toward D2D communication are classified into a finite number of types, and the service trading between the base station and users is properly modeled. Next, necessary and sufficient conditions are derived to provide incentives for users' engagement in D2D communication. Finally, our analysis is extended to the case in which there is a continuum of users. Simulation results show that the contract can effectively incentivize users' participation, and increase capacity of the cellular network than the other mechanisms.</P>

Prognostic Value and Staging Classification of Lymph Nodal Necrosis in Nasopharyngeal Carcinoma after Intensity-Modulated Radiotherapy

Yanru Feng,Caineng Cao,Qiaoying Hu,Xiaozhong Chen 대한암학회 2019 Cancer Research and Treatment Vol.51 No.3

Purpose The aim of the present study was to evaluate the prognostic value of magnetic resonance imaging (MRI)!determined lymph nodal necrosis (LNN) in nasopharyngeal carcinoma (NPC) and explore the feasibility of an N-classification system based on the 8th edition of the American Joint Committee on Cancer (AJCC) system. Materials and Methods The MRI scans of 616 patients with newly diagnosed stage T1-4N1-3M0 NPC who were treated with definitive intensity-modulated radiotherapy were reviewed. Results Multivariate analysis showed that LNN was an independent negative prognostic predictor of distant metastasis free survival (hazard ratio, 1.634; 95% confidence interval, 1.023 to 2.609; p=0.040) and overall survival (hazard ratio, 2.154; 95% confidence interval, 1.282 to 3.620; p=0.004). Patients of classification N1 disease with LNN were reclassified as classification N2, and classification N2 disease with LNN as classification N3 in the proposed N-classification system. Correlation with death and distant failure was significant, and the total difference between N1 and N3 was wider with the proposed system. Conclusion MRI-determined LNN is an independent negative prognostic factor for NPC. The proposed N classification system is powerfully predictive.

Multi-objective optimization design for the multi-bubble pressure cabin in BWB underwater glider

Yanru He,Baowei Song,Huachao Dong 대한조선학회 2018 International Journal of Naval Architecture and Oc Vol.10 No.4

In this paper, multi-objective optimization of a multi-bubble pressure cabin in the underwater glider with Blended-Wing-Body (BWB) is carried out using Kriging and the Non-dominated Sorting Genetic Algorithm (NSGA-II). Two objective functions are considered: buoyancyweight ratio and internal volume. Multi-bubble pressure cabin has a strong compressive capacity, and makes full use of the fuselage space. Parametric modeling of the multi-bubble pressure cabin structure is automatic generated using UG secondary development. Finite Element Analysis (FEA) is employed to study the structural performance using the commercial software ANSYS. The weight of the primary structure is determined from the volume of the Finite Element Structure (FES). The stress limit is taken into account as the constraint condition. Finally, Technique for Ordering Preferences by Similarity to Ideal Solution (TOPSIS) method is used to find some trade-off optimum design points from all non-dominated optimum design points represented by the Pareto fronts. The best solution is compared with the initial design results to prove the efficiency and applicability of this optimization method.

Micro-structural Evolution of Granite Residual Soil under External Loading Based on X-ray Micro-computed Tomography

Yanru Zhao,Xiaohui Sun,Tiande Wen,Rui Chen,Liping Huang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.8

As a completed decomposed product of granite rock, the granite residual soil widely distributes in South China with a special soil structure that can be easily damaged under external disturbance. Therefore, studying the evolution of soil cracks during the loading process is important for engineering practice that needs to evaluate the soil shear strength, such as slope stability analysis. The purpose of this study is to investigate the micro-structure for the intact granite residual soil under external loading base on X-ray computed tomography (CT) through global and local scanning (with resolutions of 180 μm and 26.7 μm, respectively). The micro-structural evolution of the cross-sections of soil column extracted from a granite residual soil layer under axial loading was investigated by CT scanning with a 0.5 mm slice thickness. The number of cracks (including macro-cracks and meso-cracks), area ratios and porosity corresponding to varying loading stages (initial, peak-stress and failure) were analyzed based on the cross-sectional CT images. Test results shows that the structure strength of the soil was mainly subject to macro-cracks. In addition, the increase of the porosity is mainly attributed to the generation and expansion of the cracks along sandy particle under external loading. This study can provide theoretical support and data support for understanding the micro-structural evolution of granite residual soil that is commonly encountered in civil engineering.