Optimizing opportunistic preventive maintenance strategy for multi-unit system of CNC lathe

Yue Wu,Zhaojun Yang,Jili Wang,Xiaojuan Chen,Wei Hu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.1

Due to the many components in the multi-unit system (i.e., CNC machine tools), the existing preventive maintenance (PM) strategies conducting independent PM for every component are time-consuming and waste unnecessary maintenance and downtime costs. Hence, this paper introduces the idea of opportunistic maintenance into the PM and proposes an opportunistic imperfect PM approach, which is a more realistic PM policy for a multi-unit system. In this approach, the effect of PM is assumed to be imperfect to correct the failure rate of each unit. According to the corrected failure rate function, the imperfect PM strategy of a single unit is optimized by minimizing the proposed unit maintenance cost rate under the limitation of minimum reliability. Then, these independent imperfect PM strategies for units are rescheduled by the proposed opportunistic PM strategy under the condition of judging the reliability OM threshold of units. We further optimize the opportunistic PM strategy by minimizing the total maintenance cost. Finally, the advantage of our approach is verified by the case study of 18 CNC lathes.

China International Development Cooperation Agency: Establishment, Improvement, and Limitations

( Wu Yue ),( Zhang Muhui ) 부경대학교 글로벌지역학연구소 2021 Journal of Global and Area Studies(JGA) Vol.5 No.1

Foreign aid is a salient component of China’s diplomacy. In recent years, China has gradually become a prolific donor and has attracted extensive international attention. In 2018, the Chinese government established the China International Development Cooperation Agency (CIDCA) as a specialized agency to manage its outgoing foreign aid, which represents China’s determination to reform its foreign aid system further. This paper analyzes the factors leading to the establishment of CIDCA and presents a comprehensive evaluation of its impacts on China’s foreign aid. It argues that CIDCA is a product of the internal and external pressures faced by the Chinese government. The agency exerts a multifaceted influence on, institutionalizes the characteristics of, and alleviates the problems existing in China’s foreign aid. However, CIDCA is not a panacea for Chinese aid because it has not completely solved existing problems. Thus, CIDCA is an initial step in the right direction. As such, its future influence and effectiveness require further observation.

China’s Cautious Approach to the Venezuelan Crisis: Strategic Overdraft and Nonintervention Principle

YUE;WU 경희대학교(국제캠퍼스) 국제지역연구원 2021 아태연구 Vol.28 No.4

The current China–Venezuela relationship adheres to the South-South cooperation (SSC) model wherein the two countries have established an integrated cooperative approach with “loan-for-oil” deals at its core; however, in contrast with its recent softening stance on interventions, China has taken a cautious approach to the crisis in Venezuela since 2014. Nevertheless, not many studies highlight the reasons for China’s cautiousness. This paper tries to mitigate the gap by examining China’s strategic overdraft as exposed by this response and exploring the challenges in SSC model. It is herein argued that dual overdrafts of material power and credibility constitute the reason for China’s nonintervention in Venezuela. Meanwhile, as the country hoped to continue its presence in Venezuela and is concerned over the overdraft credibility risk by withdrawing, it chose adopt hedging as a form of flexible involvement. To avoid a similar situation in the future, China should neither rely on economic complementarity nor rigidly stick to nonintervention. With national economic and political interests and cooperative sustainability as a guide, China should clarify and redefine its nonintervention principle and adopt preventive measures for risk assessment and cooperation practices to innovate a more sustainable SSC model.

A Research on User Interest Model Using Ontology and VSM Extension

Yue-zhong Wu,Shu-hong Chen 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7

The user interest model is the key technology for us to efficiently obtain personalized high quality resources in huge amounts of data. On the basis of traditional user interest model, combining with the concept of ontology, this paper comes up with a construction method based on ontology semantic tree and space vector method, and its eigenvalue is changing by using forgetting curve. The model describes a theme by using semantic concept tree, and it not only simply to describe the semantic relations between concepts, but also can reflect the user interest drift character. It is more accurate in characterization of user interest, and better reflects the change of user interest, and efficiently improves the quality of network document resource personalized services. Finally the experiment describes the update process of the proposed model by using an example, and illustrates that the proposed model is simple and practical.

ZNF424, a novel human KRAB/C2H2 zinc finger protein, suppresses NFAT and p21 pathway

( Yue Qun Wang ),( Jun Mei Zhou ),( Xiang Li Ye ),( Yong Qi Wan ),( Yong Qing Li ),( Xiao Yan Mo ),( Wu Zhou Yuan ),( Yan Yan ),( Na Luo ),( Ze Qun Wang ),( Xiong Wei Fan ),( Yun Deng ),( Xiu Shan Wu 한국생화학분자생물학회 (구 한국생화학회) 2010 BMB Reports Vol.43 No.3

Zinc finger-containing transcription factors are the largest single family of transcriptional regulators in mammals, which play an essential role in cell differentiation, cell proliferation, apoptosis, and neoplastic transformation. Here we have cloned a novel KRAB-related zinc finger gene, ZNF424, encoding a protein of 555aa. ZNF424 gene consisted of 4 exons and 3 introns, and mapped to chromosome 19p13.3. ZNF424 gene was ubiquitously expressed in human embryo tissues by Northern blot analysis. ZNF424 is conserved across species in evolution. Using a GFP-labeled ZNF424 protein, we demonstrate that ZNF424 localizes mostly in the nucleus. Transcriptional activity assays shows ZNF424 suppresses transcriptional activity of L8G5-luciferase. Overexpression of ZNF424 in HEK- 293 cells inhibited the transcriptional activity of NFAT and p21, which may be silenced by siRNA. The results suggest that ZNF424 protein may act as a transcriptional repressor that suppresses NFAT and p21 pathway to mediate cellular functions. [BMB reports 2010; 43(3): 212-218]

An analytical analysis of a single axially-loaded pile using a nonlinear softening model

Wu, Yue-dong,Liu, Jian,Chen, Rui Techno-Press 2015 Geomechanics & engineering Vol.8 No.6

The skin friction of a pile foundation is important and essential for its design and analysis. More attention has been given to the softening behaviour of skin friction of a pile. In this study, to investigate the load-transfer mechanism in such a case, an analytical solution using a nonlinear softening model was derived. Subsequently, a load test on the pile was performed to verify the newly developed analytical solution. The comparison between the analytical solution and test results showed a good agreement in terms of the axial force of the pile and the stress-strain relationship of the pile-soil interface. The softening behaviour of the skin friction can be simulated well when the pile is subjected to large loads; however, such behaviour is generally ignored by most existing analytical solutions. Finally, the effects of the initial shear modulus and the ratio of the residual skin friction to peak skin friction on the load-settlement curve of a pile were investigated by a parametric analysis.

Study Of Acquisition Streetlights Background Signal By Multi-Sensor Array

WU Yue,SHI changhong,YANG Wei 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

The multi-sensor array, such as the sound, light, infrared, vibration etc, is used to get the street lights environmental information. Combined with a variety of clock control strategy for control lamps, it can achieve the background information of perception, detection, identification, and collect the typical characteristics of an effective signal, to rationally determine the threshold value range in the circuit design and lay a solid foundation for the realization of intelligent control of lights. The joint acquisition streetlights background signal through a variety of sensors carried out in a typical experimental design and preparation, principles, introduction, experimental methods and experimental analysis of the results, not only can test the design of control circuit, but also optimize the choice of the sensor models to provide true comparative data. In order to facilitate in a real environment to detect and further identify goals, to achieve the typical information data fusion of specific objectives, the ultimate street intelligent control can be achieved. Experimental results show that the magnetic sensors and infrared sensors detect close proximity, so the model of sensor needs to be replaced or further improved design (such as the optimization of pre-level filtering and amplification circuit design). Acoustic sensors and vibration sensors to detect distance, can meet night lighting control at residents of the community as well as tourist attractions. But there are a lot of distances to meet the use demands of roads and high-speed traffic, the more optimal designs and experiments is need. In addition, a range problem of information synchronize data collection, background noise and a variety of information data crosstalk need to be solved in the joint acquisition experiments, which in the paper were discussed.

More precise determination of V_cb & V_ub and direct CP violation in charmless B decays

Yue-liang Wu,Yu-Feng Zhou,YWhen-Yu Wang 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.2

More precise extractions on the two important CKM matrix elements jVcbj and jVubj are presented up to 1=m2 Q corrections, based on the complete heavy-quark eective eld theory (HQEFT) of QCD. The HQEFT as a large component QCD provides us with a complete theoretical framework for correctly and systematically evaluating the subleading and higher-order contributions in 1=mQ expansion of heavy quarks. A global analysis on charmless B decays is made, based on the isospin and SU(3) avor symmetry. An isospin relation is found to be very useful for studying SU(3) symmetry-breaking eects of strong phases and exploring new types of electroweak penguin eects. The direct CP violation in charmless B decays is predicted, and its precise measurement is helpful either for testing SU(3) symmetry breaking eects of strong phases or for probing new physics beyond standard model.

옌쉐퉁의 도덕현실주의 국제관계이론: 포괄적인 검토

YUE WU 계명대학교 국제학연구소 2021 국제학논총 Vol.34 No.-

Established by Professor Yan Xuetong from Tsinghua University, the theory of moral realism in international relations theory represents the achievement of Chinese scholars in innovations in international relations. This theory aims to use political leadership measured by morality as an explanatory variable to analyze the reason and logic of the rising power replacing the dominant position of the dominant power. However, extant literature on the theory fails to systematically review moral realism in Yan’s work, reflecting fragmentation and misunderstanding. Therefore, this study aims to comprehensively review moral realism in international relations, refute and correct problematic understandings, and explore potential applications for theoretical development. It argues that moral realism corresponds to classical realism more than neoclassical realism as a theoretical paradigm and that it is not a theory with ideological purposes serving China’s grand strategy. The study further argues that the theory has not matured owing to issues with concept definition, logical contradictions, and biases of case analysis. Moreover, the influence of ancient Chinese thought in Yan’s moral realism and the limited research object and field may impede its theoretical application. This study proposes applying moral realism to the study of foreign aid and holds that the field of foreign aid conforms to moral realism, alleviates some moral realism deficiencies, and expands the application scope of the theory. 칭화대 옌쉐퉁 교수가 정립한 국제관계론 도덕현실주의는 국제관계 혁신에 대한 중국 학자들의 업적을 대변한다. 이 이론은 도덕이 측정한 정치적 리더십을 설명변수로 삼아 지배적 권력의 지배적 지위를 대신하는 신진 권력의 이유와 논리를 분석하려는 것이다. 그러나, 이 이론에 대한 현존하는 문헌들은 단편화와 오해를 반영하여 옌쉐퉁의 작품에서 도덕 현실주의를 체계적으로 검토하는 데 실패한다. 따라서 본 연구는 국제관계에서 도덕현실주의를 종합적으로 검토하고, 문제가 있는 이해를 반박하고 바로잡으며, 이론적 발전을 위한 잠재적 응용을 탐구하는 것을 목적으로 한다. 도덕현실주의가 이론 패러다임으로서 신고전주의 현실주의보다 고전주의 현실주의에 부합하며, 중국의 대전략에 봉사하는 이념적 목적을 가진 이론이 아니라는 주장이다. 이 연구는 또한 개념 정의, 논리적 모순, 사례 분석의 편향에 대한 문제 때문에 이론이 성숙하지 못했다고 주장한다. 게다가, 옌쉐퉁의 도덕현실주의에 대한 고대 중국 사상의 영향과 제한된 연구 목적과 분야는 그것의 이론적 적용을 방해할 수 있다. 본 연구는 대외원조 연구에 덕현실주의를를 적용하는 것을 제안하며, 대외원조 분야가 덕현실주의에 부합하고, 도덕현실주의의 결핍을 일부 완화하며, 이론의 적용 범위를 확대한다고 주장한다.

中国学界关于国际发展合作研究的文献计量分析:现状与反思

YUE WU 국민대학교 중국인문사회연구소 2022 중국지식네트워크 Vol.20 No.-

中国愈发重视国际发展合作,提升了其在中国外交中的地位。作为中国外交与对外政策的智力支持,中国学术界关于国际发展合作的研究却较为广泛。目前,既有文献缺少对中国学界关于国际发展合作研究的文献计量统计分析,造成缺乏对中国学界在该领域研究现状的系统性梳理。为此,本文从中国社会科学引文索引(CSSCI)中下载相关文献,利用Citespace软件进行文献计量统计分析,以挖掘中国学界关于国际发展合作研究的特征、演变、热点与前沿,进而解释造成目前研究现状的原因并提出反思与建议。本文认为,中国学界对国际发展合作的研究虽然取得了一定成果,但仍然在概念辨析、科研合作、学科建设、学术期刊建设以及研究议题与议程设置这些方面存在短板,有可以提升的空间。多重因素造成目前的研究短板。这需要中国学界针对上述问题做出回应与努力。