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Zhirui Zhao,Lina Hao,Mingfang Liu,Haoze Gao,Xing Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.7
This paper focuses on the trajectory tracking issue of the pneumatic artificial muscle (PAM) exoskeleton system. First of all, a new type of the PAM elbow exoskeleton was introduced to assist wearers in elbow flexion/extension movement. Moreover, a model-free adaptive control approach was combined with the prescribed performance control to ensure the tracking errors to be converged to the predefined requirements. Meanwhile, to suffer the influence of the unknown external disturbance on the exoskeleton, a terminal sliding mode control was adopted to reduce the tracking errors. From a theoretical perspective, the stability of the proposed controller can be proved by Lyapunov synthesis. After two sets of experiments, the proposed control method can further improve the tracking accuracy in the PAM elbow exoskeleton, compared with the other three model-free adaptive control methods. Simultaneously, the maximum absolute value of the tracking errors never exceeded the designed boundary.
An auto-resize cache structure for high-performance and low-power
Zhirui Liao,Jaehwan Kim,Jongwha Chong 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
In this paper, we design a cache scheme which can reduce the power consumption and increase the performance of cache through auto-resize of L1 cache, which is called auto-selecting cache scheme. Cache memory occupies a significant fraction of a chip’s overall power consumption. Recent researches advocate using “resizable” to adjust cache capability based on the fact that requirement in applications will reduce cache size and power consumption. Based on the fact that different programs need different sizes of instruction and data cache, an auto-selecting cache scheme is proposed. This scheme can dynamically adjust the sizes of level 1 cache according to program requirement of instruction and data cache. The proposed structure can reduce power consumption and improve cache performance. According to the SPEC2000 simulation, the average power consumption of L1 cache is reduced by 7.43% and the average of energy delay production is improved by 16.08% with auto-selecting cache structure compared traditional one.
Research on Per-cell Codebook based Channel Quantization for CoMP Transmission
( Zhirui Hu ),( Chunyan Feng ),( Tiankui Zhang ),( Qiubin Gao ),( Shaohui Sun ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.6
Coordinated multi-point (CoMP) transmission has been regarded as a potential technology for LTE-Advanced. In frequency division duplexing systems, channel quantization is applied for reporting channel state information (CSI). Considering the dynamic number of cooperation base stations (BSs), asymmetry feature of CoMP channels and high searching complexity, simply increasing the size of the codebook used in traditional multiple antenna systems to quantize the global CSI of CoMP systems directly is infeasible. Per-cell codebook based channel quantization to quantize local CSI for each BS separately is an effective method. In this paper, the theoretical upper bounds of system throughput are derived for two codeword selection schemes, independent codeword selection (ICS) and joint codeword selection (JCS), respectively. The feedback overhead and selection complexity of these two schemes are analyzed. In the simulation, the system throughput of ICS and JCS is compared. Both analysis and simulation results show that JCS has a better tradeoff between system throughput and feedback overhead. The ICS has obvious advantage in complexity, but it needs additional phase information (PI) feedback for obtaining the approximate system throughput with JCS. Under the same number of feedback bits constraint, allocating the number of bits for channel direction information (CDI) and PI quantization can increase the system throughput, but ICS is still inferior to JCS. Based on theoretical analysis and simulation results, some recommendations are given with regard to the application of each scheme respectively.
황지루이(Zhirui Huang),이애란(Ai Ran Lee) 응용생태공학회 2020 Ecology and resilient infrastructure Vol.7 No.3
전 세계적으로 홍수, 가뭄, 열파 등 기상재해가 빈발하는 환경에서 도시공원은 휴식, 문화, 생태적 기능뿐만 아니라 도시민의 안전을 위한 기능도 제공해야 한다. 본 연구는 도시 내 기후변화에 대응하는 녹색 공간인 생활권 공원에 복합기능을 확보하는 목적으로 도시인의 안전을 위한 도시방재공원의 분류체계를 제안하였다. 문헌 조사를 통해 분석지표를 추출하고, 대상지 현장조사 및 관련자 인터뷰를 통해 분류체계를 검증하였다. 평가를 위한 대분류는 도시공원의 입지, 공간구성, 방재복합시설 3가지로 구분하고, 실증 분석을 통하여 도출된 문제점에 대한 개선방향을 제안하였다. Against the backdrop of frequent weather disasters such as floods, droughts, and heat waves worldwide, urban parks should provide functions for the safety of urban residents as well as rest, culture, and ecological functions. In this study, a classification system for urban disaster prevention parks is proposed for the safety of the urbanites with the aim of securing a complex function in a green space in response to climate changes in the city. Analytical indicators were extracted through literature research, and the classification system was verified through on-site surveys of the target sites and interviews with those involved. The large class for evaluation was divided into three types: location, spatial composition, and disaster prevention complex facilities of urban parks; the direction of improvement was proposed for problems identified through empirical analysis.
Mitsuhiro Okayasu,Zhirui Wang 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.10
To better understand the effect of an asperity on crack closure behavior, K-CMOD relations were examined using artificial asperity/wedge, inserted into the fatigue crack in a three point bending specimen made of a hardened medium carbon steel. Experimental results revealed that the unloading phase of the K vs. CMOD curve exhibited a concave shape if soft artificial asperity (Al alloy) was inserted,signifying acceleration in the CMOD decrease at zero applied load. This was mainly related to elastic and plastic deformation in the wedge material during the unloading process. On the contrary, the linear unloading portion of K vs. CMOD was obtained as hard asperity (high carbon steel) was employed, which specified deceleration in the CMOD decrease at zero applied load, where the only elastic deformation in the asperity was affected. From their unloading curves, the severity of crack closure or ?Keff value was found to be related to the strength of the asperity material. The values of ?Keff were examined in two different ways, e.g., (i) the remote displacement method and (ii) the adjusted compliance ratio method (ACR). The ?Keff value, measured using both approaches, decreases with increasing wedge strength, such as hardness and yield strength. The rate of reduction in <Keff was, however, changed depending on the manner of ?Keff examination, in which the ?Keff decreased at a higher rate for the compliance ratio method and at a lower rate for the remote displacement method. The reason for this is discussed in the present work.
Prediction of essential genes in prokaryote based on artificial neural network
Luo Xu,Zhirui Guo,Xiao Liu 한국유전학회 2020 Genes & Genomics Vol.42 No.1
Background Rapid identification of new essential genes is necessary to understand biological mechanisms and identify potential targets for antimicrobial drugs. Many computational methods have been proposed. Objectives To construct an essential genes classifier which satisfies more different organisms, and to study the redundancy of features used in the prediction of essential genes. Methods We designed a 57-12-1 artificial neural network model to predict the essential genes of 31 prokaryotic genomes. Four methods including self-predictions of each organism, the leave-one-genome-out method, predicting all by one organism, and self-predictions of all organisms were applied to assess the predictive performance. Additionally, the 57 features used in the artificial neural network model were analyzed by weighted principal component analysis to screen the key features strongly related to the essentiality of genes. Results Our results compared with previous researches indicate that our models had better generalizability. Furthermore, this method reduced the features to 29 while maintaining stable prediction performance overall, suggesting that some features are redundant for gene essentiality, and the screened features contained more important biological information for gene essentiality. Conclusion This study showed the effectiveness and generalizability of our artificial neural network model. In addition, the screened features could be used as key features in computational analysis and biological experiments.
Zhao Jujun,Wang Zhirui 부경대학교 글로벌지역학연구소 2019 Journal of Global and Area Studies(JGA) Vol.3 No.2
As the region with the most serious air pollution in China, Hebei Province, which is close to Beijing, is facing stringent environmental regulation. In face of the continuous pressure from the central government, most areas in Hebei Province, represented by Handan City, have carried out high-intensity campaign-style environmental governance. However, Chengde City, which is also in Hebei Province, adopted different strategies. In order to explain the differences, this paper constructs a resource mobilization framework for the campaign-style governance, namely “control-incentive-negotiation” framework. The framework is tested by taking the air pollution regulation in Handan and Chengde in 2017-2018 as examples. The study found that despite the unprecedentedly strengthened authority of the central government since the 18th CCP National Congress, under the combined effect of theater politics, differentiated incentives and implicit negotiation, if a region faces too many political tasks, the local government will choose the operations and policies that are the most beneficial for itself. The research results is helpful to understand the campaign-style environmental governance in China, as well as the vertical intergovernmental relations.
황지루이,이애란,Huang, Zhirui,Lee, Ai-Ran 한국토지주택공사 토지주택연구원 2022 LHI journal of land, housing, and urban affairs Vol.13 No.2
본 연구는 도심내 정신건강의 녹색치유공간의 사회적 필요성에 기인하여 생활밀착형 정원에 대한 현 시대의 사회적 인식요소 분석을 통해 발전방향을 모색하였다. 연구 방법으로 빅데이터 툴 중 덱스톰을 활용하여 웹정보 데이터를 수집하고, 텍스트마이닝을 진행하여 키워드 분석, 네트워크 분석과 담론분석을 통해 요소의 추출과 관계성을 파악하였다. 분석 결과 첫째, 치유공간과 치유환경은 도시 내부인 생활밀착의 공간 안에 친화적 건강 환경을 구축하고 있었다. 둘째, 생활밀착은 시설뿐 아니라 생활문화와 도시환경을 연동하여 국가와 지방행정, 시민이 참여하는 사업과 활동을 담고 있으며 생활밀착형 정원은 녹색복지와 서비스 프로그램을 통해 내실화되고 있다. 결론으로 정신건강에 유익하고 친근한 생활권의 공익형 정원은 긍정적 자극을 줄 수 있는 치유 환경으로서의 녹색인프라이다.
Interference Alignment Based Transceiver Design in OSG mode of HetNets
( Qin Niu ),( Zhimin Zeng ),( Tiankui Zhang ),( Zhirui Hu ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.6
This paper focuses on solving co-channel interference (CCI) issues arising in the open subscriber group (OSG) mode of heterogeneous networks (HetNets). Considering a general framework consisting of arbitrary number of picocells within a macro cell, where the inter-user interference (IUI) is the main CCI to macro user equipments (UEs), while the the inter-cell interference (ICI) is the major CCI to pico UEs. In this paper, three IA based transceiver design schemes are proposed. For macro cell, we uniformly use block diagonalization (BD) scheme to eliminate the IUI. And for picocells, three IA schemes are proposed to mitigate the ICI. The first scheme, named as zero forcing IA (ZF-IA) scheme, aligns the inter picocell interference onto an arbitrary sub-space of the cross-tier interference using ZF scheme. Considering the channel state information (CSI) of the desired channel of pico UEs, the second scheme, named as optimal desired sub-channel selected IA (ODC-IA) scheme, aligns the inter picocell interference onto a certain sub-space of the cross-tier interference, which guarantees the largest channel gain of the desired signal of pico UEs. The third IA scheme, named as maximum cross-tier interference selected IA (MI-IA) scheme, is designed for the system with less receive antennas. The inter picocell interference is aligned onto the space of the strongest cross-tier interference and only the interference on this space is nullified. The complexity analysis and simulations show that the proposed transceiver design schemes outperform the existing IA schemes in the OSG mode of HetNets, and the MI-IA scheme reduces the requirement of the receive antennas number with lower complexity.