A improved cutting force and stress distribution model of the round edge cutting tool in the ultra precision machining

Qiming Xiao,Jianfeng Xu 한국생산제조학회 2014 한국생산제조시스템학회 학술발표대회 논문집 Vol.2014 No.9(2)

Implementation of 2-D Biorthogonal Wavelet Transform Using 2-D APDF

Qiming Fu,Xiao Zhou,Chengyou Wang,Baochen Jiang 보안공학연구지원센터 2015 International Journal of Signal Processing, Image Vol.8 No.5

All phase digital filter (APDF) is a new type of linear phase FIR digital filter which was proposed in recent years, and a general method to design 2-D FIR digital filters called 2-D APDF is presented in this paper. Firstly, the theory of biorthogonal wavelet transform and 2-D APDF is expounded. Secondly, a novel algorithm is proposed to implement biorthogonal wavelet transform by using 2-D APDF based on DFT and IDCT. The relations between two kinds of filters are discussed. As an important application of biorthogonal wavelet transform, multi-resolution analysis of 2-D image signal could be used to test the feasibility and applicability of the proposed algorithm. Finally, the test image can be reconstructed perfectly in the multi-resolution analysis of 2-D image experiment using MATLAB tool in this paper, and the analysis indicates that the proposed method performs well.

Passivity-Based Control System of Permanent Magnet Synchronous Motors Based on Quasi-Z Source Matrix Converter

Qiming Cheng,Lin Wei 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.6

Because of the shortcomings of the PID controllers and traditional drive systems of permanent magnet synchronous motors (PMSMs), a PMSM passivity-based control (PBC) drive system based on a quasi-Z source matrix converter (QZMC) is proposed in this paper. The traditional matrix converter is a buck converter with a maximum voltage transmission ratio of only 0.866, which limits the performance of the driven motor. Therefore, in this paper a quasi-Z source circuit is added to the input side of the two-stage matrix converter (TSMC) and its working principle has also been verified. In addition, the controller of the speed loop and current loop in the conventional vector control of a PMSM is a PID controller. The PID controller has the problem since its parameters are difficult to adjust and its anti-interference capability is limited. As a result, a port controlled dissipative Hamiltonian model (PCHD) of a PMSM is established. Thereafter a passivity-based controller based on the interconnection and damping assignment (IDA) of a QZMC-PMSM is designed, and the stability of the equilibrium point is theoretically verified. Simulation and experimental results show that the designed PBC control system of a PMSM based on a QZMC can make the PMSM run stably at the rated speed. In addition, the system has strong robustness, as well as good dynamic and static performances.

A user interface design of the health QR code system in China

Qiming Zhu,Young-Hwan Pan 한국융합학회 2021 한국융합학회논문지 Vol.12 No.1

팬데믹 시대를 맞아 코로나 등의 질병 예방과 통제에도 스마트 의료 기술을 응용하게 되었고, 중국의 스마트 의료 기술을 대표하는 개인 의료 QR 코드 시스템도 편리성과 안전성에 있어 개선되어야 할 문제점이 대두되었다. 즉, 현행 중국의 개인 의료 QR 코드 시스템은 그 종류가 많고 각각 독립적으로 존재하여 스마트 취약 계층의 사용자에게 큰 불편을 초래하고 있으며, 동시에 수집된 개인정보 보호와 처리의 문제도 제기되고 있다. 본 논문에서는 이러한 문제 를 개선하기 위하여 개인 의료 QR 코드 시스템의 통합과 개인정보 보호 과정을 투명화할 것을 제안하고, 사용자의 편리를 위한 인터페이스를 설계하였다. 본 논문에서 제시한 방법과 새롭게 디자인한 인터페이스를 통해 사용자는 더욱 편리하고 안전하게 스마트 의료 시스템을 누릴 수 있으며 광범위하게 확산될 우려가 있는 질병의 예방과 통제에도 유 효한 성과를 보장할 수 있다. In the pandemic era, smart medical technology has also been applied to prevent and control diseases such as COVID-19. Health QR code system shave sparked recent discussion in the hopes of improving its convenience and safety. The many types of current health QR code systems in China exists causes inconvenience to those that are vulnerable, as well as raising the issue of personal information protection. In order to solve this problem, this paper proposes transparent integration of the health QR code systems and the process of protecting personal information, as well as designs an interface for user convenience. Through the method presented in this paper and the newly designed interface, users can enjoy the smart pharmaceutical system more conveniently and safely, and ensure effective results in the prevention and control of diseases that are likely to spread.

Coordinated Control of the DFIG Wind Power Generating System Based on Series Grid Side Converter and Passivity-Based Controller Under Unbalanced Grid Voltage Conditions

Qiming Cheng,Xinqiao Ma,Yinman Cheng 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.5

In order to solve the problem of excessive damage to doubly fed induction generator (DFIG) system under the condition of unbalanced voltage, this paper presents an improved coordinated control strategy based on doubly-fed induction generator (DFIG) wind power system, which can solve these problems well. The innovation of this paper is that the parallel grid-side converter (PGSC) uses a passivity-based controller (PBC) based on the Port Control Hamiltonian Dissipation (PCHD) model. Not only can four diff erent control goals be achieved, namely, constant voltage of DC bus voltage, grid-side active power without second harmonics, grid-side reactive power without second harmonics, and grid-side current without negative sequence component, but also to ensure that the balance of stator and rotor current without distortion, the DFIG output power and electromagnetic torque without pulsation. The proposed coordinated control strategy has the characteristics of not changing the control strategy of the rotor-side converter and avoiding complex high-order matrix. The experimental results on the software platform and the hardware platform show that the proposed coordinated control strategy has the advantages of fast response, strong anti-interference ability, high stability, less control parameters.

Research on Multi-Port Power Electronic Transformer for Intelligent Home Electric Distribution System

Qiming Fan,Youmin Hu,Xiangbin Zhao 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6

Power electronics converter (PEC) with four ports, including three DC ports and one AC port is proposed for intelligent home power system. The AC port has bidirectional working ability, in rectifier mode, the home power system absorbs the power from the grid and to the home load, in grid-connect inverter mode, the converter transfers the power generated by the photovoltaic cell to the grid. The directional DC port is used to connect the photovoltaic cell. Two bidirectional DC ports are used for the electric vehicle (EV) and storage battery. The EV absorbs the power by the bidirectional DC port in charging mode when the State-of-Charge (SoC) is relatively low and the power supply from the grid is enough or the power generated by the photovoltaic is enough, and the EV also supplies power to the home power system in discharging mode when the EV` SoC is relatively high and the power supply of home power system from the grid is not enough. The storage battery supplies the power to the home power system when the SoC is relatively high and the power from the grid and photovoltaic cell is not enough, and absorbs the power from the home power system when the SoC is relatively low and the power from the grid and photovoltaic cell is enough. A 3.3 kW PEC prototype with 4 ports are developed, and the effectiveness of the proposed intelligent scheme for home electric distribution system is verified by the experimental result.

The Prophet: Prevention of Three-Hypers through Real-time Monitoring System

Qiming Zhu(주계명),Zhicong Qin,Shouyi Yu,Hyungsin Kim(김형신) 한국디자인학회 2020 한국디자인학회 학술발표대회 논문집 Vol.2020 No.6

Periodic Solutions in n-species Ratio-depedent Food Chain Model with Time Delays

Qiming Liu,Rui Xu 경북대학교 자연과학대학 수학과 2004 Kyungpook mathematical journal Vol.44 No.2

A delayed periodic n-species ratio-dependent food chain model is investigated.By using Gaines and Mawhin’s continuation theorem of coincidence degree theory, a set of easily veriable sufficient conditions are derived for the existence of positive periodic solutions to the model.

A Defect in Zinc Finger Protein Double B-box 1a (DBB1a) Causes Abnormal Floral Development in Arabidopsis

Qiming Wang,Xiaoju Tu,Keqin Deng,Jianxin Zeng,Xiaoying Zhao,Dongying Tang,Xuanming Liu 한국식물학회 2009 Journal of Plant Biology Vol.52 No.6

The double B-box (DBB) type zinc finger protein has thus far been shown to be involved in photomorphegenesis in Arabidopsis thaliana. Here, we show that DBB1a is expressed in the embryo, cytolden, and flower. Misexpression of DBB1a in mutant plants resulted in abnormal numbers and patterns of floral organs. We further show that DBB1a could regulate expression of several floral homeotic genes, including APETALA 2, APETALA 3, PISTILLATA, and AGAMOUS. Interestingly, expression of the microRNA gene MiR172, which is involved in organ boundary establishment, was also misregulated in the dbb1a mutant plants. Our study identified a previously uncharacterized role of DDB1a in regulation of expression of floral homeotic genes and miR172, which is important for understanding of floral pattern formation.

晉唐草書筆法理論之嬗變

孫其明(Qiming Sun),김창경(Chang Gyeong Kim) 부경대학교 인문사회과학연구소 2023 인문사회과학연구 Vol.24 No.1

서법예술은 한(漢)대를 거치면서 자각적 시대로 접어들었고, 이에 대량의 서법 관련 저서들이 등장하였다. 이 서적에는 서법의 본체(本體), 원류(源流), 품평(品評), 창작(創作) 등 다방면에 걸친 내용들을 다루고 있다. “Yingou(銀鉤)”라는 용어는 처음에는 은제 또는 은색 갈고리를 지칭하였고, 이후에는 그 의미가 일반화되고 확장되어 머리 장식, 문양 장식, 낚시 바늘 또는 초승달과 같은 여러 의미로 사용되었다. 서예에 도입된 이 “Yingou(銀鉤)”라는 용어는 역사적 시기에 따라 다른 의미를 나타내었다. 서예 작품과 문자에서 매끄럽고 구부러진 획을 의미하며, 특히 초서(草書)의 붓놀림인 “Xiaokai(小楷)”의 획을 가리킨다. 이는 획이 강하고 둥글며 넘쳐흐르는 선형적 아름다움을 사용하는 것을 말한다. 육조(六朝)시기 장초(章草)의 서예 용어인 “Yingouchaiwei(銀鉤蠆尾)”는 획의 몸짓과 글자의 몸짓이라는 두 가지 차원에서 이해할 수 있다. 육조 시기는 기본적으로 서술적이고 모호한 이미지를 그려내고자 하는 미적 추구에 기초한 것으로 보인다. 이에 반해 당대 시기 초서의 방식인 절채고(折釵股), 옥루흔(屋漏痕), 추화사(錐畫沙), 인인니(印印泥), 비조입림(飛鳥入林), 경사입초(驚蛇入草), 고봉자진(孤蓬自振)、 경사좌비(驚沙坐飛) 등에서 드러나는 붓놀림의 급격한 변화와 필획의 질감은 “Yingouchaiwei(銀鉤蠆尾)”와 많은 부분에 있어 호환성이 높다고 할 수 있다. 이러한 점에서 붓놀림의 진일보한 직관과 세밀화라는 명확한 시대적 특징을 지니게 되었고, 그 예술적 함의 또한 더욱 생동적일 뿐만 아니라 지향성을 지니게 되었다. 이에 이러한 초서 필법은 초서 서체가 부단하게 성숙되고 초서의 양식과 형태가 풍부해짐에 따라 변형되고 진화되어 온 것임을 알 수 있다. The term “Yingou (銀鉤)” originally referred to silver or silver hooks, which were later extended to include headdresses, decorations, fishhooks, crescent and other multi-layered meanings. Originally, the word “Yingou (銀鉤)” refers to a hook made of or had the colour of silver. As its meaning extends, Yingou is also used to refer to headwear, design pattern, fishhook or new moon. When introduced into calligraphy, the term comes to have the meaning of smooth, curved strokes in calligraphy works and letters, and especially it refers to the skilful handling of the brush in Caoshu (草書) and even specifically the strokes in Xiaokai(小楷). The artistic character of “Yingouchaiwei(銀鉤蠆尾)” should include two aspects: first, the strokes of the first finger are strong and smooth, and the strokes are long and short, with strong bones, rich bones and fleshy, flowing and resilient lines. The second-finger characters are very restrained, majestic and majestic, with a strong and elegant, flowing and clean, extremely grassy yet chic posture beauty. “Yingouchaiwei(銀鉤蠆尾)”, a calligraphy term in Zhangcao(章草) during Six Dynasties, shall be understood from two dimensions —the gesture of strokes and the gesture of characters. Compared to the aesthetic pursuit for descriptive, ambiguous images in Six Dynasties, manners of Caoshu(Shechaigu, Wulouhen, Zhuihuasha, Yinyinni, Feiniaorulin, Jingsherucao, Gupengzizhen, Jingshazuofei, etc.) in Tang Dynasty — the sharp changes in brushwork, the texture of strokes — resembles more closely to “Yingouchaiwei” and gives a more specific, vivid account of the writing process and the strokes. Such brushwork transforms and evolves with the maturing and enriching of the styles and forms of Caoshu. The Cursive Calligraphy of the Six Dynasties“Yingouchaiwei(銀鉤蠆尾)” to the Tang Dynasty,manners of Caoshu(Shechaigu, Wulouhen, Zhuihuasha, Yinyinni, Feiniaorulin, Jingsherucao, Gupengzizhen, Jingshazuofei, etc.) To a certain extent, it reflects the continuous comprehensive and richness of cursive calligraphy style and pen-use style.