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| 1 | Research on evaluations of several grey relational models adapt to grey relational axioms显示文摘Grey relational analysis is an important part of the grey systems theory, and it is the basis of the grey clustering analysis, grey decision-making and grey controlling. To research whether grey relational models satisfy the four grey relational theorems, several kinds of grey relational models are commented. Some problems including the properties of normality, pair symmetry and wholeness are discussed. The phenomenon that the lower value of almost each grey relational model is not equal to zero is proved. The contradiction problems between the properties of wholeness and pair symmetry are verified. Finally, several propositions are constructed to explain the above problems. | Xie Naiming Liu Sifeng | 2009 | Journal of Systems Engineering and Electronics2009，20，2： | 34 |
| 2 | Prediction model of interval grey number based on DGM(1,1)显示文摘In grey system theory,the studies in the field of grey prediction model are focused on real number sequences,rather than grey number ones.Hereby,a prediction model based on interval grey number sequences is proposed.By mining the geometric features of interval grey number sequences on a two-dimensional surface,all the interval grey numbers are converted into real numbers by means of certain algorithm,and then the prediction model is established based on those real number sequences.The entire process avoids the algebraic operations of grey number,and the prediction problem of interval grey number is usefully solved.Ultimately,through an example's program simulation,the validity and practicability of this novel model are verified. | Bo Zeng Sifeng Liu Naiming Xie | 2010 | Journal of Systems Engineering and Electronics2010，21，4： | 19 |
| 3 | Interval grey number sequence prediction by using non-homogenous exponential discrete grey forecasting model显示文摘This paper aims to study a new grey prediction approach and its solution for forecasting the main system variable whose accurate value could not be collected while the potential value set could be defined. Based on the traditional nonhomogenous discrete grey forecasting model(NDGM), the interval grey number and its algebra operations are redefined and combined with the NDGM model to construct a new interval grey number sequence prediction approach. The solving principle of the model is analyzed, the new accuracy evaluation indices, i.e. mean absolute percentage error of mean value sequence(MAPEM) and mean percent of interval sequence simulating value set covered(MPSVSC), are defined and, the procedure of the interval grey number sequence based the NDGM(IG-NDGM) is given out. Finally, a numerical case is used to test the modelling accuracy of the proposed model. Results show that the proposed approach could solve the interval grey number sequence prediction problem and it is much better than the traditional DGM(1,1) model and GM(1,1) model. | Naiming Xie Sifeng Liu | 2015 | Journal of Systems Engineering and Electronics2015，26，1： | 18 |
| 4 | Extension of TOPSIS for fuzzy multi-attribute decision making problem based on experimental analysis显示文摘This paper is concerned with a technique for order performance by similarity to ideal solution(TOPSIS) method for fuzzy multi-attribute decision making,in which the information about attribute weights is partly known and the attribute values take form of triangular fuzzy numbers.Considering the fact that the triangular fuzzy TOPSIS results yielded by different distance measures are different from others,a comparative analysis of triangular fuzzy TOPSIS ranking from each distance measure is illustrated with discussion on standard deviation.By applying the most reasonable distance,the deviation degrees between attribute values are measured.A linear programming model based on the maximal deviation of weighted attribute values is established to obtain the attribute weights.Therefore,alternatives are ranked by using TOPSIS method.Finally,a numerical example is given to show the feasibility and effectiveness of the method. | Min Tian Yuanyuan He Sifeng Liu | 2010 | Journal of Systems Engineering and Electronics2010，21，3： | 16 |
| 5 | A DEA-TOPSIS METHOD FOR MULTIPLE CRITERIA DECISION ANALYSIS IN EMERGENCY MANAGEMENT显示文摘A hybrid approach of DEA (data envelopment analysis) and TOPSIS (technique for order performance (preference) by similarity to ideal solution) is proposed for multiple criteria decision analysis in emergency management.Two DEA-based optimization models are constructed to facilitate identifying parameter information regarding criterion weights and quantifying qualitative criteria in TOPSIS.An emergency management case study utilizing data from the Emergency Management Australia (EMA) Disasters Database is provided to demonstrate the feasibility of the proposed analysis procedure. | Ye CHEN Kevin W. LI Haiyan XU Sifeng LIU | 2009 | Journal of Systems Science and Systems Engineering2009，18，4： | 6 |
| 6 | TWO-STAGE ORDERING DECISION FOR A SHORT-LIFE-CYCLE PRODUCT显示文摘This paper investigates the ordering decision problem for a short-life-cycle product under Bayesian updating. For a product characterized by a single manufacturing cycle and two selling periods, we depict a Two-Stage (TS) ordering strategy with a stochastic dynamic programming model in the view of the whole system, and prove that the expected profit function of the whole system is concave on the first ordering quantity and the remedial ordering quantity, respectively. Then, the optimal ordering decision is developed. Finally, characteristics of the optimal ordering quantities are analyzed with several examples. Our results show that the suggested TS decision model is better than a Quick Response (QR) decision model. | Bin LIU Jian CHEN Shu WU Sifeng LIU | 2006 | Journal of Systems Science and Systems Engineering2006，15，3： | 5 |
| 7 | Influences of processing parameters on microstructure during investment casting of nickel-base single crystal superalloy DD3显示文摘The effects of solidification variables on the as-cast microstructures of nickel-base single crystal superalloy DD3 have been investigated by using the modified Bridgman apparatus.The experiments were performed under a thermal gradient of approximately 45 K·cm-1 and at withdrawal rates ranging from 30 to 200 m·s-1.The experimental results show that the primary and secondary dendritic arm spacings(PDAS and SDAS) decrease when the withdrawal rate is increased.Compared with the theoretical models of PDAS,the results are in good agreement with Trivedi's model.The relationships of PDAS and SDAS with withdrawal rates can be described as ? 1 =649.7V -0.24±0.02 and? 2 =281V -0.32±0.03 ,respectively.In addition,the size of theγ′phase significantly decreases with increasing withdrawal rate. | Gao Sifeng Liu Lin Xu Yiku Yang Chubin Zhang Jun Fu Hengzhi | 2012 | China Foundry2012，9，2： | 4 |
| 8 | A microfluidic photolithography for controlled encapsulation of single cells inside hydrogel microstructures显示文摘为单个房间的控制封装在 microchannels 内产生 hydrogel 微观结构的一条 microfluidic 途径被开发。方法基于允许的修改显微镜设计影印石版术 photopolymerization poly (乙烯乙二醇) diacrylate (PEG-DA ) 里面 microchannels。制服大小的 hydrogel 微观结构(在直径的 50 m ) 与坚定的位置一个一个地被产生没有失去生存能力,包含单个房间。兴趣的房间能被有选择地在形成的 hydrogel 微观结构内要包含的任何种可见标签识别。单个房间的大规模封装与 80% 的相对高的效率被完成,包含的房间的生存能力能被移开与 Trypan 蓝色识别的死了的房间保证。这个方法对模式简单、快、方便有为大量基于房间的应用程序的单个房间的 microchannels。为示范, carboxylesterase 的二细胞内部的酶试金被执行在包含的单个 HepG2 房间以内调查酶集中和运动信息的分发。 | JiangJiang Liu Dan Gao SiFeng Mao Jin-Ming Lin | 2012 | Science China Chemistry2012，55，4： | 4 |
| 9 | Preparation and Dynamic Tensile Behavior of C200 Green Reactive Powder Concrete显示文摘A new type of green reactive powder concrete (GRPC) with compressive strength of 200 MPa is prepared by utilizing composite mineral admixtures, natural fine aggregates, and short and fine steel fibers. The quasi-static mechanical properties (mechanical strength, toughness, fracture energy and interfacial bonding strength) of GRPC specimens, cured in three different types of regimes, are investigated. The experimental results show that the mechanical properties of the C200 GRPC made with the powder binders that is composed of 40% of Portland cement, 25% of ultra fine slag, 25% of ultra fine fly ash and 10% of silica fume are better than the others'. The corresponding compressive strength, flexural strength and fracture energy are more than 200 MPa, and 30 000 J/ m2 respectively. The dynamic tensile behavior of the C200 GRPC is also investigated through the split Hopkinson pressure bar (SHPB) according to the spalling phenomenon. The dynamic testing results demonstrate that strain rate has an important effect on the dynamic tensile behavior of GRPC. With the increase of strain rate, its peak stress and relevant strain increase. The GRPC exhibits an excellent strain ratio stiffening effect under the dynamic tensile load with high strain ratio, resulting in a significant change of the fracture pattern. | ZHANG Yunsheng SUN Wei LIU Sifeng JIAO Chujie LAI Jianzhong | 2006 | Transactions of Tianjin University2006，12，B09： | 3 |
| 10 | Denitrification and the controlling factors in Yunnan Plateau Lakes(China): Exploring the role of enhanced internal nitrogen cycling by algal blooms显示文摘Denitrification plays an important role in nitrogen(N) removal in freshwater ecosystems.This internal process regulates the fluctuations of N concentration, especially for lakes with high nutrients concentrations and long residence time. Lakes in Yunnan plateau(southwestern China) provide typical cases, while studies in this region have been rare.Therefore, we studied denitrification of two lakes(Lake Dianchi in hypereutrophic state and Lake Erhai in mesotrophic) in this region. We used acetylene inhibition technique to quantify potential denitrification rate(PDR) of these lakes in April and August, 2015 and 2016. PDR of the sediments ranged 0–1.21 μmol/(N·m^2·hr), and that of overlying water ranged 0–0.24 μmol/(N·L·hr). Then, we used Least Angle Regression to determine the controlling factors for denitrification. Nutrients controlled PDR from two aspects: providing essential nitrogen sources; and affecting the richness and metabolism of denitrifying bacteria. In April, both aspects limited PDR; while only nitrogen sources limited PDR in August, due to depleted nitrate and enhanced denitrifying bacteria activity. Ammonia was most significant to denitrification, indicating that nitrate from nitrification transported to the bottom of wellmixed lake provide major N source by denitrification. The high PDR and low nitrate concentrate in August were evidence of an enhanced internal N cycling by algal blooms. | Sifeng Wu Zhen Wu Zhongyao Liang Yong Liu Yilin Wang | 2019 | Journal of Environmental Sciences2019，31，2： | 3 |
| 11 | An approach to increase prediction precision of GM(1,1) model based on optimization of the initial condition显示文摘 | Yuhong Wang Yaoguo Dang Yueqing Li Sifeng Liu | 2010 | Expert Systems With Applications2010，，8： | 2 |
| 12 | Using the Fractional Order Method to Generalize Strengthening Buffer Operator and Weakening Buffer Operator显示文摘To reveal the relationship between a weakening buffer operator and strengthening buffer operator, the traditional integer order buffer operator is extended to one that is fractional order. Fractional order buffer operator not only can generalize the weakening buffer operator and the strengthening buffer operator, but also results in small adjustments of the buffer effect.The effectiveness of the grey model(GM(1,1)) with the fractional order buffer operator is validated by six cases. | Lifeng Wu Sifeng Liu Yingjie Yang | 2018 | IEEE/CAA Journal of Automatica Sinica2018，5，6： | 2 |
| 13 | Prediction of efficient outputs based on GM(1,N) model and weak DEA efficiency显示文摘This paper expresses the efficient outputs of decisionmaking unit(DMU) as the sum of 'average outputs' forecasted by a GM(1,N) model and 'increased outputs' which reflect the difficulty to realize efficient outputs.The increased outputs are solved by linear programming using data envelopment analysis efficiency theories,wherein a new sample is introduced whose inputs are equal to the budget in the issue No.n + 1 and outputs are forecasted by the GM(1,N) model.The shortcoming in the existing methods that the forecasted efficient outputs may be less than the possible actual outputs according to developing trends of input-output rate in the periods of pre-n is overcome.The new prediction method provides decision-makers with more decisionmaking information,and the initial conditions are easy to be given. | Jiefang Wang Sifeng Liu | 2011 | Journal of Systems Engineering and Electronics2011，22，6： | 2 |
| 14 | Estimation of failure probability in braced excavation using Bayesian networks with integrated model updating显示文摘A probabilistic model is proposed that uses observation data to estimate failure probabilities during excavations.The model integrates a Bayesian network and distanced-based Bayesian model updating.In the network,the movement of a retaining wall is selected as the indicator of failure,and the observed ground surface settlement is used to update the soil parameters.The responses of wall deflection and ground surface settlement are accurately predicted using finite element analysis.An artificial neural network is employed to construct the response surface relationship using the aforementioned input factors.The proposed model effectively estimates the uncertainty of influential factors.A case study of a braced excavation is presented to demonstrate the feasibility of the proposed approach.The update results facilitate accurate estimates according to the target value,from which the corresponding probabilities of failure are obtained.The proposed model enables failure probabilities to be determined with real-time result updating. | Longxue He Yong Liu Sifeng Bi Li Wang Matteo Broggi Michael Beer | 2020 | Underground Space2020，5，4： | 2 |
| 15 | A novel grey forecas- ting model andits optimization 显示文摘 | CUI Jie LIU Sifeng ZENG Bo | 2013 | Applied Mathematicl2013，37，9： | 1 |
| 16 | Study on the hydration heat of binder paste in high-performance concrete 显示文摘 | YUNSHENG ZHANG WEI SUN SIFENG LIU | 2002 | Cement and Concrete Research2002，，32： | 1 |
| 17 | Reliability Evaluation of All-User Terminals in LEO Satellite Communication Network Based on Modular Reduction显示文摘LEO satellite communication network has a large number of satellites distributed in low orbits,which leads to multiple coverage of many areas on the ground.It is hard work to describe and evaluate the reliability of LEO satellite communication network.To solve this problem,the reliability of all-user terminals in LEO satellite communication network is defined,and the corresponding reliability evaluation method is proposed in the paper.Due to the large scale of the interstellar network,a modular reduction algorithm using the modular network instead of the original network for state decomposition is proposed in this paper.Case study shows that the calculation time of the proposed method is equivalent to 6.28%of the original state space decomposition algorithm.On this basis,the reliability of LEO satellite communication network is further analyzed.It is found that the reliability of LEO satellite network was more sensitive to the reliability of Inter-Satellite link and the satisfaction of global coverage in the early stage,and it is more sensitive to the reliability of the satellite in the later stage.The satellite-ground link has a relatively constant impact on of LEO satellite network. | Yangyang Du Sifeng Liu Zhigeng Fang Su Gao | 2022 | China Communications2022，19，2： | 1 |
| 18 | Research on the energy-saving effect of energy policies in China:1982-2006显示文摘 | Chaoqing Yuan Sifeng Liu Zhigeng Fang Junlong Wu | 2009 | Energy Policy2009，37，7： | 1 |
| 19 | The role and position of gray system theory in science development显示文摘 | Liu Sifeng Forrest J | 1997 | The Journal of Grey System1997，9，4： | 1 |
| 20 | The role and position of grey system theory in science development显示文摘 | Liu Sifeng Forrest J | 1997 | The Journal of Grey System1997，9，4： | 1 |
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