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15 October 2006, Volume 25 Issue 5 Previous Issue    Next Issue

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The design research on raising the bearing capacity of long-span stone Two-way Curved Arch Bridges MU Chang-chun，ZHANG Hui-li，MENG Yun 2006, 25(5): 1-4.  Abstract ( )   PDF (176KB) ( )   The Youdu River bridge, which was built in 1972 with the longest span, is a two-way curved arch bridge. During its construction it became dangero us because the arch frame was washed away due to the flood, and the arch to psagged 51.7cm.In 1985 it was reinfo rced with Bolt Anchored Concrete, and then it can bear the car-15, gua-80 load. But after 20 years, it must bear the qi-20, gua-100 load due to the traffic development. In this paper the reinforced method is introduced. This can be referenced by the following project. References | Related Articles | Metrics

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The application of gray system theory to construction control for Jialingjiang river bridge in baiguodu YANG Lei，ZHANG Yong，hui，GAO Jian 2006, 25(5): 5-8.  Abstract ( )   PDF (202KB) ( )   The grey systems theory applied in continuous rigid frame bridge construction control is discussed in this article. The auther makes the practice of the construction control for Jialing jiang river bridge in Baiguodu as an example. Combined with the construction control, this paper introduces the basic principle, specific execution procedures and the application validity of this gray predictive control system. This conclusion can be extended to be used in the construction of the continuous beam bridge,the arch bridge, the cable-stayed bridge etc, which constructed by cantilever erection. References | Related Articles | Metrics

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Application and development of prestressing technique in prestressed concrete bridge LIU Shan-hong 2006, 25(5): 9-12.  Abstract ( )   PDF (193KB) ( )   Improvement of prestressing technique is needed by development of concrete performance used in long span concrete bridge engineering.Deficiencies of prestressing technique used in construction are presented now adays. Several common schemes and capabilities of primary sensors used in new types of prest ressing equipments controlled by digital computers are also described. It can be used as improvement references of construction techniques by now . References | Related Articles | Metrics

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FEA analysis of geometry nonlinear reinforced concrete rigid-frame arch bridge CHEN Gui-mei，WU Jin-liang，SHEN gang 2006, 25(5): 13-16.  Abstract ( )   PDF (1284KB) ( )   In this paper, the constitutive models, as well as the properties of their element and the models of FEA are discussed. No nlinear analysis for reinfor ced concrete rigid-frame arch bridge containing carried out by using the lar gegeneral structural analysis softw are ANSYS. Geometric nonlinearity and material nonlinearity of members are also considered. The effects of different load dist ributions on the ultimate load-carrying capacity of the bridge are investigated. References | Related Articles | Metrics

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Accuracy analysis about pier shaft construction survey of sutong bridge ZHOU Xi-zhen，CAO Cao 2006, 25(5): 17-20.  Abstract ( )   PDF (155KB) ( )   In the construction of big type bridge. require higher precision of pier shaft construction survey. the paper about precision of polar coordinates method setting out pier shaft mould board and precision of the EDM trigonometric leveling method carry through pier tip height control and positioning pr ecision of pier axis as well as needed precision of pass control point of bridge axis carry through accuracy analysis and discuss. References | Related Articles | Metrics

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Key technological study of the construction of the joints of simply-supported girder bridges SHEN Jian-liang 2006, 25(5): 21-23.  Abstract ( )   PDF (422KB) ( )   The constr uction of the joints of simply-suppor ted girder bridges used in extension projects of expressways and the construction technology of the commonly used joints of both simply-supported plate girders and simply-supported T-beams will be studied. The technical requirements of joint design will be analyzed first. Then according to the requirements, the key technological study of the construction of the joints will be carried out. At the conclusion, the corresponding construction measures and proposals will be put forward. References | Related Articles | Metrics

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The theory analysis of two kinds of bridge rubber bearing for isolated function GUO Xiang-ming，XIAO Sheng-xie 2006, 25(5): 24-27.  Abstract ( )   PDF (189KB) ( )   In this paper , The normal rubber bearing(RB) and lead rubber bearing(LRB) are analyzed by applying designing principle of isolation on the basis of linar-elastic model. After pointing out the defect of normal rubber bearing(RB) , the authors mainly analyze key parameters, for example, primate stiffness、yield rigid、lead diameter and talk over the effects by key parameters on Isolated Function. In the end, we point out the advantage of lead rubber bearing(LRB) and how it overcomes the defect of normal rubber bearing(RB) . References | Related Articles | Metrics

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How to layout the south-north approach of lijiaotuo Changjiang River bridge Chongqing ZHAO Li-jie，CHEN Kun-lin，LIU Jun，CHEN Zuo-ming 2006, 25(5): 28-31.  Abstract ( )   PDF (194KB) ( )   The South-north Approach of Lijiatuo Changjiang River Bridge, Chongqing, is the main access co nnecting District Ba'nan with District Jiulong.However, the service level of this road is so bad that the frequency of traffic accident is very high,which influence the economic development of the district around the road. It's time to lay out it now.The author suggests a comparatively overall lay out plan from the seven aspects, subgrade, bridge deck,draining and soon. References | Related Articles | Metrics

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3-D numerical analysis of the flow pattern in the opening area of extra-long highway tunnel WEN Yu-hui，XIE Yong-li，LI Ning-jun 2006, 25(5): 32-36.  Abstract ( )   PDF (270KB) ( )   Based on the design of Qinling separ ated ex tra-long highway tunnel, this article mainly used CFD to analyze the flow pattern in the tunnel's opening area with the purpose to determine the character of the flow pattern and also this article raised some methods to reduce the cross infection in the tunnel's opening area. References | Related Articles | Metrics

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Avalanche control technology in fanjialing tunnel project DENG Ren-qing 2006, 25(5): 37-39.  Abstract ( )   PDF (186KB) ( )   Avalanche often appears in mountain tunnel excavation under the complex geological conditions. It could lead to heavy damage. The general situation of Fanjialing tunnel is introduced at first. Further the factors those affect avalanche are analyzed. According to these factors the treatment principle and scheme are both presented in paper. It obtain a good affect in Fanjialing tunnel project. References | Related Articles | Metrics

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Cartoon simulation analysis of illusion caused by highway alignment and roadside environments GUO Qian，WU Guo-xiong，WANG Fu-jian 2006, 25(5): 40-44.  Abstract ( )   PDF (925KB) ( )   The illusion sections on a highway are the most dangerous parts to cause traffic accidents. At first the dangerous highway sections of the illusion of the road are sorted. Meanwhile the main reasons that lead to all kinds of illusions are analyzed. Then the scenes of simple and living instances are chosen for demonstrating purposes. Based on that, the influences of the illusions on traffic safeties are analyzed. Finally basic steps and methods of making cartoons with 3dsmax are introduced———the scene modeling and fix ing, picture pasting,orbit movement controlling,image render ng and formatting and so on. References | Related Articles | Metrics

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Research on modulus determination of granular base of asphalt pavement ZHU Hong-hou，ZHENG He-ping，HE Zhao-yi，WU Guo-xiong 2006, 25(5): 45-48.  Abstract ( )   PDF (164KB) ( )   Resilient modulus of unbound granular mat erials is influenced str ongly by stress level. So pavement structure parameters must be taken into account in modulus det ermination. In this paper,the pavement structure parameters which influence the stress level and modulus of granular base were analyzed with orthogonal method. The results show that the module of subgrade and the thickness of asphalt face layer have important influence on modulus of granular base. Moreover, a modulus determination method of granular base according to structure parameters was developed by multiple regression, which is more rationally than experiential method. References | Related Articles | Metrics

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Design method of mother-asphalt-mixture for semi-flexible pavement HU Ling-ling，LIU Zhu-guo，ZHANG Da-ke，CHENG Chang-qing，WU Guo-xiong，FAN Tong-jiang 2006, 25(5): 49-53.  Abstract ( )   PDF (235KB) ( )   Semi-flexible pavement is generally described as a composition pavement that possess the cha racteristic of asphalt concrete and Portland cement concrete, which is filled with Portland cement grout in open??graded basic-asphalt-mixture. It is a void-closed framework structure. However, its basic-asphalt-mixture is framework-void texture. To make the basic-asphalt-mixture have good volume character and performance, based on the local condition of China and referring to the domestic-overseas study, the design method of basic-asphalt-mixture based on the orthogonal test design method is presented, which uses the void 19%~ 21%, Maxshell stability > 3MPa and fluid 40~ 55 as the design target value, through which the best range of mixture grade and asphalt contents have been acquired, and the validity of the design method has been validated by means of the test. References | Related Articles | Metrics

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Experiment study on the abrasion and impact performance of fiber strength latex mortar MEI Ying-jun，WANG Pei-ming，LIANG Nai-xing，LI Zhi-yong 2006, 25(5): 54-57.  Abstract ( )   PDF (198KB) ( )   For meeting the per formance demands of pavement cement base material, key trials for abrasion and impact characteristic of steel fiber and polypropylene fiber strength latex mortar were taken. On the result of ball bearing wear test, used abrasion resistance index analyses the characteristic and its influence factors of the mortar.For the distinct impact test result, adopt energy consumption mechanisms, impact to ughness discuss the addition of steel fiber and polypropylene fiber on the wear and impact property of latex mortar. The result shows the addition of steel fiber and polypr opylene fiber in latex mortar could greatly improve its abrasion and impact property,and polypropylene fiber could tremendo us enhance the impact performance after the initial crack. The conclusion of this paper advanced new ideal for mortar and concrete in the use of pavement, and gives reference for the application of steel fiber and polypropylene strength latex mortar and concrete. References | Related Articles | Metrics

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Study on rutting testing of dif ferent- thickness asphalt mixture HE Ai- jun，ZHOU Jin-chuan，RAO Xiao-yu，HE Yan 2006, 25(5): 58-62.  Abstract ( )   PDF (351KB) ( )   according as the result of rutting test with the standard rutting test and different-thickness rutting test, analysing calculation methods of long-time rutting test dynamic stability, and analysing the correlation of those test methods by means of dynamic stability, the result suggest there is a good correlation of those tests. Based on it, offering rutting test of field-incised thick sample the guidance. References | Related Articles | Metrics

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An investigation on steel fibers-reinforced asphalt mixture YU Fang，YANG Xi-wu，ZHONG Yu-xia 2006, 25(5): 63-67.  Abstract ( )   PDF (170KB) ( )   In this paper , physical-mechanics performance of steel fibers reinforced asphalt mixture are discussed. A series of tests are carried out to analyse steel fibers influence on asphalt mixture. The test results show that steel fibers-reinforced asphalt mixture's split strength and deformation at low temperature are evidently improved. So steel fibers can improve low tempreture anti-cracking performance of asphalt mixture. In addition the added steel fibers can also improve asphalt mixture's performance of tensile strength at normal tem perature and thermal stability . References | Related Articles | Metrics

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Grey evaluation method of the damage of cement concrete pavement WANG Xing-zhong，WANG Ze-min 2006, 25(5): 68-70.  Abstract ( )   PDF (127KB) ( )   According to the existing evaluation methods and theories, analysis and build the structural indexes of the damaged concrete pavement, appilying grey rational analysis documents the results of the other evaluation methods such as PCI, SRR ,and get some conclusions about the influences of the index factors, grey evaluation is significant to the practical engineering . References | Related Articles | Metrics

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The analysis and study of the bituminous pavement stabilized soil thin-base course LU Jian，LIANG Nai-xing，ZHAO Hui 2006, 25(5): 71-73.  Abstract ( )   PDF (134KB) ( )   Through the investigation and analysis to the old bitumino us pavement stabilized soil thin-base course in Qingyang area of Gansu, and the checking calculat ion and comparison to the experimental road, the stabilized soil thin-base course is a feasible pavement structure style and can bring down the cost of the basement greatly.It has remarkable economic benefit; the prospect of popularizing the stabilized soil-thin basement of bituminous pavement is very well. References | Related Articles | Metrics

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Research actuality and prospect of reinforced soil retaining wall ZHOU Shi-liang，HE Guang-chun，WANG Cheng-zhi 2006, 25(5): 74-79.  Abstract ( )   PDF (227KB) ( )   From experimentation and theory, the research actuality on reinforced soil retaining wall is enucleated, the limitations of the existing research work are discussed, finally,some key topics of its further research are put forward, namely, the study on structural characteristics and failure mechanism of reinforced soil retaining wall recko ning with dynamic load, coupled hydromechanica laction and creep of reinforcement. References | Related Articles | Metrics

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The method of fuzzy comprehensive analysing and evaluating slope stability on catastrophe theory XIAO Sheng-xie，LIU Wen-fang，LI Hong-mei 2006, 25(5): 80-84.  Abstract ( )   PDF (210KB) ( )   The Analysing and Evaluating slope stability is often complicated because there are various factors and also because the influence exerted is of very difference in degree. This paper is based on catast rophe theory to discuss and analysis the assessment for slope stability.At first, we divide the complex system of slope stability into some subsystems,then put them to quantitative and recursive operation by using t he norma lizatio n fo rmula so as to obtain the ultimate catastr ophe membership function values of slope stability. Finally , we evaluate slope stability according to them. References | Related Articles | Metrics

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Slope stability and strengthening analysis base on FEM LI Wei-qing 2006, 25(5): 85-87.  Abstract ( )   PDF (229KB) ( )   In this paper,An elasto-plastic strength reduction FEM is utilized in the analysis of slope stability and reinforcing and is compared with the equilibrium method. The results show that the strength reduction FEM is can automatically find out the accurate critical slip surfaces and corresponding safety factors. Moreover,it can still find out the glide order of each slip surface under no any hypothesis, and the internal forces of support pile are obtained. It is an effective method for the analysis of slope stability and reinforcing, and it is feasible to engineering application. References | Related Articles | Metrics

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Fuzzy synthesize rating study on the resistant ability against diasters of Chongiqng trunk highway LI Shu-qing，TANG Bai-ming，ZHENG Zhi-ming，WANG Qing-zhen 2006, 25(5): 88-93.  Abstract ( )   PDF (246KB) ( )   Based on the investigation and characters analysis of Chongqing trunk highways, the paper set up indexes system to rate the resist ant ability against diasters of Chongqing trunk highway with the help of AHP. And using the Fuzzy Rating Theory, the paper made a fuzzy synthesize rating to them and got the rating result. References | Related Articles | Metrics

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Construction guiding of structures to control debris flow along highway(Ⅱ) CHEN Hong-kai，MA Kang，MA Yong-tai，TANG Hong-mei 2006, 25(5): 94-97.  Abstract ( )   PDF (144KB) ( )   Authors intrduce items about construction of rock screen, protect bank structure, diversion dam, wing-shaped converge structure, aqueduct and bed-roughened piles in《Construction Guiding of Structures to Control Debris Flow along Highway》in this paper.Analyses some problems in application of the construction guiding, which can give some important lessons in construction of structures to control debris flow along highway, further provide important foundation to revise bearing technique codes about constructing and maintaining of highways. References | Related Articles | Metrics

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The application of the exponential smoothing method in the landslide treating engineering LI Jian-feng，ZHANG Wei-zhong，YIN Guang-zhi，KANG Qin-rong，CHENG Guo-jian 2006, 25(5): 98-100.  Abstract ( )   PDF (134KB) ( )   The forecasting model of exponential smoothing is avalid method in forecasting and decision-making.Firstly,the exponential smoothing method is presented in the paper. Secondly, in light of the real landslide conditions, a model is established for the special displacement of some observation points and the prediction which is based on this model came out. The forecast results show that the errors between the forecast values and the fact values error little. It shows that the model may be well applied on the fo recast of the landslide deformation. the method can be used in real engineering. And the decision-making can depend on the results we get from the model. References | Related Articles | Metrics

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The impact energy analyses of high-speed landslide rockmass falling to pieces WU Wen-xue，TANG Shu-ming，LIU Yong-jiang 2006, 25(5): 101-104.  Abstract ( )   PDF (186KB) ( )   In the paper,the relations of the transferring and translating of energy while high-speed landslide rockmass impact immobile roadblock are analyzed in detail.The expressions of the distributive energy when landslide ro ckmass fall to pieces,and the average velocity and direction after impacting are putted forward. All of those establish a base to study the formation of debris flow,and are important to reduce and prevent disaster. References | Related Articles | Metrics

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Research on diffusion theory of permeation grouting QUE Yun，LIU Qiang-hua，LI Dan，SUN Yuan，LIANG Yong-fu 2006, 25(5): 105-108.  Abstract ( )   PDF (173KB) ( )   The paper deduces two kinds of permeation grouting model including plane radial flow and ball-type centripetal flow based on mechanics of seepage flow.Then the formula of this paper compares with Maag's formula based on engineering example.The computation results preliminarily show that diffusion time of Maag's formula is less than the practical time and the formula of this paper is more accordant with reality.Finally the influence of diffusion radius on grouting parameters is discussed.The results show that diffusion radius is sensitive to grouting parameters and the analytical results used by Maag's formula are basically keeping with those used by the formula of this paper . References | Related Articles | Metrics

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Research on the checking method of road base bearing capacity in loess area XIN Jian-li，ZHI Xi-lan 2006, 25(5): 109-112.  Abstract ( )   PDF (190KB) ( )   According to the characteristics of highway engineering,as to the eigenvalue of ground bearing capacity in the construction department, the corrections concerning width, relative allowable deformation and stiffness are carried out. The design value of road base bearing capacity matching the characteristics of road base in loess area are put forward. The checking method of road base bearing capacity in loess area is determined correspondingly. References | Related Articles | Metrics

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The examinational study on the local scour depth of roadbed along river LIU Li，YANG Cheng-yu，HE Guang-chun 2006, 25(5): 113-118.  Abstract ( )   PDF (259KB) ( )   In the paper, scour mechanism and factors influencing the scour depth of roadbed along river are analyzed. Through the method of theoretical analysis and experiment study, the formula of the maximum scour depth of prevention wall in concave bank of G315 is put forward.The formulation of the maximum scour depth is theoretics and technic bases of protecting water scour. References | Related Articles | Metrics

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A preliminary probing into slope project of afforestation and beautification ZHAO Fa-zhang，LING Tian-qing，ZHOU Hui 2006, 25(5): 119-123.  Abstract ( )   PDF (649KB) ( )   The exposed engineering slope can bring a series of environment questions, even can create the project disaster. This article unifies author's preliminary research achievement and the domestic road slope construction success experience, introduced slope affor ested and the beautified project principle of design with some design cases, designed the technical personnel for the correlation refers. References | Related Articles | Metrics

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Structure characteristic and pervious performance of pervious concrete WU Guo-xiong，WANG Chen，WANG Rui-yan 2006, 25(5): 124-129.  Abstract ( )   PDF (313KB) ( )   Drawing a comparison between pervious concrete and common concrete in regar d to the function, the biggest differentiation is that pervious concrete have good pervio us performance. The paper studies pervious concrete'structure characteristic,pervious indexes and affected factors, establishes the relation of pervious performance with void fraction, permeability coefficient and mechanics strength though the way of experiment, which mainly to supply the frame of reference of pervious concrete'ratio design and direct the structure design of pervious concrete road surface. References | Related Articles | Metrics

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Stress variation of reinforced concrete columns over long periods of time while under constant load PENG Zai-ping，ZHANG Yu-qiang 2006, 25(5): 130-131.  Abstract ( )   PDF (98KB) ( )   This Paper gives the formula about stress variation of reinforced concrete columns over long periods of time while under constant load, then, by using the formula, the conclusion of columns crack under certain reinforcement ratio be revealed also. References | Related Articles | Metrics

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Freeway alignment evaluation based on operation speed YANG Zhi-qing，GAO Wang-sheng，GUO Zhong-yin，GAO Jian-ping，KONG Ling-qi 2006, 25(5): 132-135.  Abstract ( )   PDF (188KB) ( )   Speed is one of the most important factors that could influence the safety of road, and there existed many operating speed prediction models and road safety evaluation models now adays, but some seriously black spot can not be identified still.This paper established a two-indexes freeway alignment evaluation model, based on the data of a freeway. The conclusion, of applying of this model on another freeway , paralleled to reality had been obtained. References | Related Articles | Metrics

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The optimizing method of alternating weighting applying in the road net planning synthetical estimation LIU Xiao-jia，KONG Xiang-chen，SHI Qi-zhou，ZHAO Hong-ying 2006, 25(5): 136-138.  Abstract ( )   PDF (133KB) ( )   the character of the system of the roadnet planning synthetically estimation are many factors and multipurpose, this paper given the alternating multipurpose decision making method which use to road net planning synthetically estimation. The alternating multipurpose decision making method overcame some deficiency of the old estimating methods, then the road net planning synthetically estimation model are given by the optimizing method of alternating weighting , the model can objectively estimate the road net project, it provide the reliance for the feasibility of road net planning , there also be give a example to verify the method. References | Related Articles | Metrics

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Boundary algorithm of dumbbell road network for pivotal infrastructure FAN Ju，ZHAO Yu-hua，LIU Ya-wen 2006, 25(5): 139-141.  Abstract ( )   PDF (172KB) ( )   According to the distributing characteristic of highway pivotal infrastructure, including super large highway bridge and long-span and extra-long highway tunnel etc, aimed at the traffic safety management, the concept of Dumbbell Road Network(DRN) is provided, and its boundary algorithm is especially discussed. Based on analysis of the boundary styles and constraint characteristic, the time-cost function is taken as the objective function, and Boundary algorithm of DRN is provided by mathematical deriv ation according to the traffic flow.Boundary algorithm is the base of the whole algorithm of DRN.Analysis Platform for determine an optimal route and network safety management is provided. References | Related Articles | Metrics

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Operating speed calculated by extra considering the inf luence of traffic and structure etc LEI Chong-shu，HUANG Tian-yuan，ZHANG Ren-gen 2006, 25(5): 142-144.  Abstract ( )   PDF (186KB) ( )   Based on the operating speed calculated according to Guidelines for Safety Audit of Highway,a new method which considers the influence of traffic and major structures is discussed. The method which modifies the speed according to Highway Capacity Manual 2000 and some data reflect the factors besides alignment.The modified speed is nearer to the actual speed. References | Related Articles | Metrics

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Research on project calculation and payment system under freeway construction ZHONG Ning，SHAO Dong 2006, 25(5): 145-148.  Abstract ( )   PDF (193KB) ( )   Under freeway construction, calculation was the important part of investigation and regulation. At present the limitation of calculation was that it paid attention to operation information of partial step and did not layo ut systematically. Based on system and openness this article researched on info system of calculation payment and acquired operational super vision system accordingly. The system has been put on application in practice. References | Related Articles | Metrics

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Finite element analysis on bottom plate structure of amalgamated shiplock MIAO Ji-lun，ZHANG Xiao-ming，ZHANG Xu-jin 2006, 25(5): 149-151.  Abstract ( )   PDF (144KB) ( )   Taken an example of Hongyanzi shiplock, the mechanics performance is analyzed. The finite element model building,element cutting,load and const raint giving,solve method are introduced.The mechanics performance characteristic of amaalgamated shiplock bottom is analyzed. This can provide with science foundation for optimuism design. References | Related Articles | Metrics

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The analysis of the influence of the degan gravel pits on riverbed development ZHANG Ai-wen，YANG Sheng-fa，CHENG Chang-hua，CHEN Li-zhen 2006, 25(5): 152-156.  Abstract ( )   PDF (244KB) ( )   Four gravel pits were excavated along the secondary channel by way of grid-type excavation at Deg an shallow patch in upper Changjiang river. After founded and validated the two dimensional mathematical model, the changes of the flow field with four representative flow quantities was calculated. The riverbed development of Degan river section was analyzed and the river regime of one hydrographic year was observed. Thus the conclusion could be reached that few changes would take place to river regime and backward erosion would hardly happen because of these gravel pits. The influence to wading constructs is very little. Partial collapse happens in a short range around gravel pits in flood. The sand peduncle above pipeline between two gravel pits isn't steady enough, so conservation measure is necessary . References | Related Articles | Metrics

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Blasting compare analysis on spiral notching and circle borehole WANG Yan-mei 2006, 25(5): 157-158.  Abstract ( )   PDF (172KB) ( )   the technique of spiral notching blasting is compare with one of circle blasting from two sides of blasting theory and numerical analysis in this paper.Results indicate that the spiral notching blasting has more advantage than the circle blasting,it can raise blasting area and drop loss energy . References | Related Articles | Metrics

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Embedded IP network technology applied in PLC BI Bo 2006, 25(5): 159-161.  Abstract ( )   PDF (136KB) ( )   An IP embedded architecture was developed in this paper. The IP protocol processor was embedded in to a PLC transparently and there is no affective happened to the PLC. References | Related Articles | Metrics

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Compare research between MDA and UML NIU Song-sen，LI Ming-chu，LIU Li-jie 2006, 25(5): 162-164.  Abstract ( )   PDF (208KB) ( )   MDA, Model Driven Architecture, is a methodology brought forward by OMG. In MDA, an abst ract model of business logic is built up and then produces final application software from the model. And UML, Unified Modeling Language, is an open, extensible Industry Standard visual modeling language. In this paper, we introduced the basic definition and characteristics of MDA and UML, and then compare them by basic definition, theory structure, implementation, and output, etc. At last, we summarized their relation and differences. References | Related Articles | Metrics

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The estimation for MA(q) model parameters——An inverse arithmetic on mixed??phase wavelets HU Bi-jin 2006, 25(5): 165-168.  Abstract ( )   PDF (159KB) ( )   In the paper, an inverse problem on mixed-phase wavelet A is discussed.An approximate reverse wavelet B(0) is obtained by using higher-order accumulate moments, data S is generated by S = B(0) * S ,and a middle wavelet C(0) = ( C,C* )is obtained through using SRA arithmetic[14] for the model S = C(0) * r .Estimation on the true wavelet A is obtained by solution for the equation C =B(0) * A.If the length of mixed-phase wavelet A is finite, a quite good result can be obtained by the arithmetic in the paper . References | Related Articles | Metrics