Receiver Techniques for Ultra-wide-band Multiuser Systems over Fading Multipath Channels

Zhou, Xiaobo,Wang, Xiaodong The Korea Institute of Information and Commucation 2003 Journal of communications and networks Vol.5 No.2

We treat the problem of channel estimation and interference cancellation in multiuser ultra-wide-band (UWB) communication systems over multipath fading channels. The UWB system under consideration employs a random time-hopping impulse radio format. We develop a channel estimation method based on linear weighted algorithm. An iterative channel estimation and interference cancellation scheme is proposed to successively improve the receiver performance. We also consider systems employing multiple transmit and/or receive antennas. For systems with multiple receive antennas, we develop a diversity receiver for the wellseparated antennas. For systems with multiple transmit antennas, we propose to make use of Alamouti’s space-time transmission scheme, and develop the corresponding channel estimation and interference cancellation receiver techniques. Simulation results are provided to demonstrate the performance of various UWB receiver techniques developed in this paper.

Research on Minnan puppet carving art in tourism cultural and creative products

Ruobing Zhou,Xiaobo Lian,Linping Zhou,Yuntao Huang,Hong Pan KOREA INSTITUTE FOR HUMANITIES AND SOCIAL SCIENCES 2024 Journal of Arts and Cultural Studies(ACS) Vol.3 No.1

Background: Due to the homogenization of the global commodity market, tourism cultural, and creative products are gradually losing their uniqueness. This research studies puppet carving art in southern Fujian, which also faces the problem of homogenization of cultural and creative products. It digs deep into the Minnan puppet head carving art, explores cultural connotations, and finds a new market differentiation method. Purpose: This paper studies the status quo of Minnan puppet head sculpture art, tourism cultural, and creative products. It explores the historical origin of Minnan puppet head carving art and excavates artistic modeling expression. It injects deep cultural connotations into the culture and creative products. This research solves the homogenization problem by achieving differentiation in the commodity market, increasing consumers’ interest. Methods: 1) Literature review to understand the influence of homogenization trend on traditional culture art and artistic characteristics of southern Fujian puppet head sculpture art and tourism cultural and creative products. 2) Comparative study to explore the connection between the puppet head carving art of southern Fujian and tourism cultural and creative products. 3) Case study method to provide innovative inspiration for the research of Minnan puppet head sculpture art tourism cultural and creative products. Results: The design should highlight the regional characteristics of Minnan puppet carving art, present its unique characteristics through personalized design, emphasize the individuality of local culture, and give the product a unique competitive advantage in the homogenized market. Conclusion: The following conclusions can be drawn from this study: 1) Cultural integration and innovation provide a more engaging experience; 2) Establish the differentiation advantage of cultural and creative products to get rid of the homogenization problem; 3) Narrative expression combined with the puppet show elements of southern Fujian makes cultural and creative products more story-telling; 4) Balance tradition and modernity. This research provides practical strategies for promoting cultural and creative products that stand out in the homogenized market.

Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement

Xiaobo Wang,Jie Zhou,Caojian Jiang,Jia Wang,Keting Gui,Hywel Rhys Thomas 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.12

Mn-Ce-Ti catalysts were prepared by different precursors (including manganese nitrate, manganese acetate, and manganese chloride) and used for selective catalytic reduction (SCR) of NO with ammonia. The relationships among the structure, physicochemical properties, and catalytic activity were explored by N2 adsorption/desorption, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3TPD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), scanning electron microprobe (SEM) and energy dispersive spectroscopy (EDS) techniques. The results show that the different Mn precursors play important roles in the catalytic activity. The Mn-Ce-Ti(N) catalyst synthesized by manganese nitrate precursor exhibits the best catalytic activity, while the Mn-Ce-Ti(C) and Mn-Ce-Ti(Cl) catalyst prepared by manganese acetate and manganese chloride, respectively, exhibit relatively low catalytic activity. The manganese nitrate precursor could promote the specific surface area and redox ability, enhance the amounts of Brønsted and Lewis acid sites, and enrich the surface active species such as Mn4+, Ce3+ and surface chemisorbed oxygen of the catalyst, all of which will contribute to the SCR performance. Moreover, the Mn-Ce-Ti(N) catalyst possesses highly dispersed and uniform surface active species, which will result in the optimal physicochemical properties and superior catalytic performance.

Reconfigurable Flight Control System Design for Blended Wing Body UAV Based on Control Allocation

Xiaobo Qu,Jingping Shi,Haijun Zhou,Ling Zuo,Yongxi Lyu 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10

The aircraft control surface fault reconfigurable scheme based on control allocation is an active approach to achieve fault-tolerant in flight control. It has obvious advantages such as the structure and parameters of the control law does not need to be redesigned as deflector failures occurs. The attainable moment subset and allocation efficiency with typical control allocation algorithms are evaluated. A modular scheme reconfigurable flight control system (FCS) of a miniature tailless Blended Wing Body UAV is studied by utilizing weighted pseudo-inverse, direct control, and fixed-point control allocation methods. The performance of the reconfigurable FCS is tested and verified with the simulation including typical failure modes such as deflector floating, loss-of-effectiveness and lock-in-place. Results validate that the reconfigurable FCS based on control allocation has preferable ability to handle deflector failures, improve the safety and reliability of aircraft. And the modular scheme proposed in the article demonstrates a good application prospect in the field of aviation and aerospace engineering.

One-step solvothermal synthesis of poly(arylene ether nitrile) decorated magnetic composite for methylene blue adsorption from aqueous solution

Zhou Xuefei,Miao Wei,Cheng Wenxi,Lin Haowei,Lin Haowei,Zheng Hongjuan,Cheng Qiaohuan,Wang Renjie,Yao Chenxue,Liu Xiaobo 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6

A series of poly(arylene ether nitrile) containing versatile carboxyl and sulfonic groups (CSPEN) were magnetically functionalized by ferroferric oxide (Fe3O4), and the obtained magnetic adsorbents (Fe3O4/CSPEN) were used to remove methylene blue (MB) dye from aqueous solution. The systematical characterizations that including scanning electron microscope (SEM), X-ray powder diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), Fourier transform infrared (FTIR) certified that the Fe3O4/CSPEN possessed versatile functional groups and magnetic separation properties. The batch adsorption studies revealed that the Fe3O4/CSPEN not only displayed high selective adsorption ability for cationic MB in the presence of anionic MO, but also exhibited a removal efficiency as high as 98.2%. Besides, the adsorption kinetics and isotherm matched well with pseudo-second-order model and Langmuir model, respectively, and the maximum adsorption capacity of Fe3O4/CSPEN for MB was 92.029 mg/g. The FTIR and Brunauer-Emmett-Teller (BET) analyses confirmed that the outstanding adsorption capacity of Fe3O4/CSPEN was attributed to their own microporous structure and the electrostatic interaction with MB. Therefore, the modified magnetic adsorbent can be used to selectively remove cationic dye from aqueous solution.

Modeling and analysis of a rotational piezoelectric energy harvester with limiters

Xiaobo Rui,Zhoumo Zeng,Yibo Li,Yu Zhang,Zi Yang,Xinjing Huang,Zhou Sha 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

A rotational piezoelectric energy harvester has the ability to convert rotation mechanical energy into electric power. The piezoelectric harvester with cantilever based on gravity excitation has received great attention. Given that gravity excitation is greater than conventional vibration excitation, and large mass are often used in low-frequency applications, large amplitudes pose a significant threat to the life of a harvester. In this study, a rotational energy harvester with limiters is investigated to promote practical development. This study establishes a theoretical model verified by experiments. Results show that stiffness has little influence on the limiting effect. In the experimental conditions, the output after 2000 N/m is basically the same. The peak value of the output voltage is linearly proportional to the space. Given that an impact excitation is generated in the collision, the limiter widens the frequency band of the output in the upsweep.

Research on Protection and Inheritance Strategy of Endangered Traditional Ceramic Crafts in Southern Fujian Folklore

Xiaobo Lian,Qingnian Zhang,Linping Zhou,Yuntao Huang,Zhouqing Liu KOREA INSTITUTE FOR HUMANITIES AND SOCIAL SCIENCES 2024 Journal of Arts and Cultural Studies(ACS) Vol.3 No.1

Background: In recent years, China's established many institutions and introduced reform programs to protect cultural heritage. Purpose:This research analyzes the protection status and development mode of endangered traditional ceramics in southern Fujian to better protect the endangered traditional ceramic technology in southern Fujian. It further researches ceramic process protection and inheritance development strategy. Methods: The attitudes of relevant national organizations towards protecting endangered traditional crafts are analyzed in the ceramic factory areas around Chaoshan and Foshan. The Dehua white porcelain, Jingdezhen porcelain mothers, and Foshan Shiwan dolls are compared through comparative research and literature to study various methods for protecting endangered traditional crafts. Further analyses on the strategies for the protection and development of the inheritance of endangered traditional ceramic crafts in the folklore of southern Fujian are also performed. Results: This article analyzes the protection and inheritance strategies of traditional ceramic crafts endangered in southern Fujian. It summarizes the three inheritance strategies of supporting inheritance talents, improving the protection mechanism, and establishing the protection and inheritance of traditional ceramic crafts on campus. Conclusion: The study of ceramic process protection strategy can summarize three points. First, to strengthen the precision support; second, to improve the inheritance and protection mechanism; and third, to establish research on the protection and inheritance of traditional ceramic processes.

Urban Flood Resilience Assessment Based on VIKOR-GRA: A Case Study in Chongqing, China

Xiaobo Chen,Zupei Guo,Hengyu Zhou,Xikun Qian,Xuesheng Zhang 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.9

Flooding has been considered as one of the major challenges of urban hazards resilience assessment. Improving urban flood risk resilience has become a critical issue for city management. However, urban flood assessment models on the resilience perspective are rare. Meanwhile, in the perspective of resilience, the existing studies using the TOPSIS (Technique for Order Preference by Similarity to an Ideal Solution) assessment method for disaster assessment lack consideration of evaluation scenarios located in the midpoint of positive and negative ideal solutions. To address these issues, this study establishes an urban flood disaster resilience assessment model, selects indicators according to the TOSE (Technical, Organizational, Social and Economic) framework, ranks cities through the VIKOR-GRA (VlseKriterijumska Optimizacija I Kompromisno Resenje, Grey Relational Analysis) method, and proposes measures to improve urban disaster resilience through the resilience assessment. Chongqing is taken as an example in this study to verify the feasibility and effectiveness of the proposed model, and practical management opinions are presented to improve flood resilience in these cities. Through the analysis of actual cases, it can be seen that the model has good applicability and can better reflect the actual situation. The knowledge of flood resilience assessment methods is of particular value to policy makers, researchers and industry professionals in assessing potential risks and recognizing the importance of flood prevention mechanisms.

汉韩外来语对比研究

임승배,Zhou Xiaobo 고려대학교 중국학연구소 2010 中國學論叢 Vol.29 No.-

중국은 하나의 통일된 다민족 국가이다. 그러한 까닭에 중국어 가운데 외래어는 타 국가민족의 언어에서 유래한 것 말고도 자국의 소수민족 언어에서 유래한 것이 아주 많다. 그러나 한국어의 외래어는 주로 중국어, 일어와 서방국가의 언어에서 유래한 것이 대부분이다. 이는 한국민족이 단일민족이라 하지만 역사적으로 볼 때 오래도록 중국과 밀접한 관계를 유지하였고, 근대에 이르러 한 차례 일본에 강점되어 그 언어사용을 강요당한 시기가 있었으며, 그 이후에 현대 경제의 고도성장 과정에 있어 서방국가들과의 빈번한 교류와 큰 관계가 있다고 볼 수 있다. 이러한 요소들이 외래어가 언어문화의 전파 과정 중에 상당히 중요한 작용을 일으켜 각종 언어들이 모두 적절하게 외래어를 수용하도록 하였을 것이다. 중국어는 고립어에 속하고 한국어는 교착어(첨가어)에 속한다. 한자는 표의문자이고 한글은 표음문자로서, 이 두 종류의 언어, 문자는 각기 다른 특징을 지녔다. 따라서 중국어와 한국어는 외래어를 차용하는 과정에 있어 각기 다른 특징이 출현할 수 있는 여지가 충분하였고, 각자 독특하게 지닌 매력을 표현해낼 수 있었다. 중국어와 한국어 가운데 모두 대량의 외래어가 존재하고 있으나 이 두 종류 언어의 외래어는 역사, 기원, 기본형식, 상용상황 등에 있어 비슷한 점을 지니거나 또는 다른 점을 지니기도 하는데, 이는 해당 두 종류 언어 자체의 특징과 다른 문화심리의 특징이 잘 반영된 결과로 볼 수 있다.

Activation of persulfate by UV and Fe²⁺ for the defluorination of perfluorooctanoic acid

Song, Zhou,Tang, Heqing,Wang, Nan,Wang, Xiaobo,Zhu, Lihua Techno-Press 2014 Advances in environmental research Vol.3 No.3

Efficient defluorination of perfluorooctanoic acid (PFOA) was achieved by integrating UV irradiation and $Fe^{2+}$ activation of persulfate ($S_2O{_8}^{2-}$). It was found that the UV-$Fe^{2+}$, $Fe^{2+}-S_2O{_8}^{2-}$, and UV-$S_2O{_8}^{2-}$ processes caused defluorination efficiency of 6.4%, 1.6% and 23.2% for PFOA at pH 5.0 within 5 h, respectively, but a combined system of UV-$Fe^{2+}-S_2O{_8}^{2-}$ dramatically promoted the defluorination efficiency up to 63.3%. The beneficial synergistic behavior between $Fe^{2+}-S_2O{_8}^{2-}$ and UV-$S_2O{_8}^{2-}$ was demonstrated to be dependent on $Fe^{2+}$ dosage, initial $S_2O{_8}^{2-}$ concentration, and solution pH. The decomposition of PFOA resulted in generation of shorter-chain perfluorinated carboxylic acids (PFCAs), formic acid and fluoride ions. The generated PFCAs intermediates could be further defluorinated by adding supplementary $Fe^{2+}$ and, $S_2O{_8}^{2-}$ and re-adjusting solution pH in later reaction stage. The much enhanced PFOA defluorination in the UV-$Fe^{2+}-S_2O{_8}^{2-}$ system was attributed to the fact that the simultaneous employment of UV light and $Fe^{2+}$ not only greatly enhanced the activation of $S_2O{_8}^{2-}$ to form strong oxidizing sulfate radicals ($SO{_4}^{\cdot-}$), but also provided an additional decarboxylation pathway caused by electron transfer from PFOA to in situ generated $Fe^{3+}$.