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Some Properties of Weak Block Designs
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作者 刘秀峰 张爱丽 朱洪 《Journal of Southwest Jiaotong University(English Edition)》 2002年第2期144-151,共8页
The necessary conditions for the existence of weak designs are given in the form of two inequalities in this paper. The relations among weak block designs (WBDs) , Balanced incomplete block designs ( BIBDs) and differ... The necessary conditions for the existence of weak designs are given in the form of two inequalities in this paper. The relations among weak block designs (WBDs) , Balanced incomplete block designs ( BIBDs) and differential balanced block designs (DBBDs) are researched. 展开更多
关键词 block design BALANCE INCOMPLETE DIFFERENTIAL
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Splitting Balanced Incomplete Block Designs with Block Size 2×k
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作者 沈军 《Journal of Shanghai Jiaotong university(Science)》 EI 2005年第1期103-106,共4页
This paper investigated the existence of splitting balanced incomplete block designs with blck size 2× k .The necessary conditions for such a design are λ(v-1) ≡0(mod k ),and λv(v- 1)≡0(mod 2 k 2).It will sho... This paper investigated the existence of splitting balanced incomplete block designs with blck size 2× k .The necessary conditions for such a design are λ(v-1) ≡0(mod k ),and λv(v- 1)≡0(mod 2 k 2).It will show that the above necessary conditions are also sufficient for k =3 with the definite exception( v,λ )=(10,1) and with several possible exceptions. 展开更多
关键词 balanced incomplete block designs(BIBD) splitting BIBD
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CONSTRUCTION OF NONSYSTEMATIC LOW-DENSITY PARITY-CHECK CODES BASED ON SYMMETRIC BALANCED INCOMPLETE BLOCK DESIGN
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作者 Lin Dengsheng Li Qiang Li Shaoqian 《Journal of Electronics(China)》 2008年第4期445-449,共5页
This paper studies the nonsystematic Low-Density Parity-Check(LDPC)codes based onSymmetric Balanced Incomplete Block Design(SBIBD).First,it is concluded that the performancedegradation of nonsystematic linear block co... This paper studies the nonsystematic Low-Density Parity-Check(LDPC)codes based onSymmetric Balanced Incomplete Block Design(SBIBD).First,it is concluded that the performancedegradation of nonsystematic linear block codes is bounded by the average row weight of generalizedinverses of their generator matrices and code rate.Then a class of nonsystematic LDPC codes con-structed based on SBIBD is presented.Their characteristics include:both generator matrices andparity-check matrices are sparse and cyclic,which are simple to encode and decode;and almost arbi-trary rate codes can be easily constructed,so they are rate-compatible codes.Because there aresparse generalized inverses of generator matrices,the performance of the proposed codes is only0.15dB away from that of the traditional systematic LDPC codes. 展开更多
关键词 Low-Density Parity-Check (LDPC) codes Nonsystematic codes Symmetric Balanced Incomplete block design (SBIBD) Finite projective geometries
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A New Method of Construction of Robust Second Order Rotatable Designs Using Balanced Incomplete Block Designs 被引量:1
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作者 B. Re. Victorbabu K. Rajyalakshmi 《Open Journal of Statistics》 2012年第1期39-47,共9页
The following article has been retracted due to the investigation of complaints received against it. Title: A New Method of Construction of Robust Second Order Rotatable Designs Using Balanced Incomplete Block Designs... The following article has been retracted due to the investigation of complaints received against it. Title: A New Method of Construction of Robust Second Order Rotatable Designs Using Balanced Incomplete Block Designs Authors: Bejjam Re. Victorbabu, Kottapalli Rajyalakshmi. The above paper is a copy of Dr. Rabindra Nath Das’s former article, entitled '“Robust second order rotatable designs (Part I)”. The scientific community takes a very strong view on this matter and we solemnly withdrawn?the paper from the journal OJS. This paper published in OJS Vol.2 No.1, 39-47, 2012, has been retracted. 展开更多
关键词 Response Surface designS Rotatability SECOND Order Rotatable designS (SORD) ROBUST SORD Robustness BALANCED INCOMPLETE block designS
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Variable Selection in Randomized Block Design Experiment 被引量:1
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作者 Sadiah Mohammed Aljeddani 《American Journal of Computational Mathematics》 2022年第2期216-231,共16页
In the experimental field, researchers need very often to select the best subset model as well as reach the best model estimation simultaneously. Selecting the best subset of variables will improve the prediction accu... In the experimental field, researchers need very often to select the best subset model as well as reach the best model estimation simultaneously. Selecting the best subset of variables will improve the prediction accuracy as noninformative variables will be removed. Having a model with high prediction accuracy allows the researchers to use the model for future forecasting. In this paper, we investigate the differences between various variable selection methods. The aim is to compare the analysis of the frequentist methodology (the backward elimination), penalised shrinkage method (the Adaptive LASSO) and the Least Angle Regression (LARS) for selecting the active variables for data produced by the blocked design experiment. The result of the comparative study supports the utilization of the LARS method for statistical analysis of data from blocked experiments. 展开更多
关键词 Variable Selection Shrinkage Methods Linear Mixed Model blocked designs
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FURTHER RESULTS ON THE EXISTENCE OF LABELED RESOLVABLE BLOCK DESIGNS
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作者 沈灏 沈佳颖 《Journal of Shanghai Jiaotong university(Science)》 EI 1999年第2期52-56,共5页
It was proved in this paper that there exists a labeled resolvable block design LRB (4,3; v ) if and only if v ≡0 (mod 4) and v ≥8, with 8 possible exceptions. It was also proved that there exists a nearly Kirkman s... It was proved in this paper that there exists a labeled resolvable block design LRB (4,3; v ) if and only if v ≡0 (mod 4) and v ≥8, with 8 possible exceptions. It was also proved that there exists a nearly Kirkman system NKS (2,4; v ) if and only if v ≡0 (mod 12) and v ≥24, except possibly when v =264 or 372. 展开更多
关键词 labeled RESOLVABLE block design NEARLY KIRKMAN system group divisible design
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U-Type Designs via New Generalized Partially Balanced Incomplete Block Designs with <i>m</i>= 4, 5 and 7 Associated Classes
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作者 Imane Rezgui Zebida Gheribi-Aoulmi Hervé Monod 《Applied Mathematics》 2015年第2期242-264,共23页
The traditional combinatorial designs can be used as basic designs for constructing designs of computer experiments which have been used successfully till now in various domains such as engineering, pharmaceutical ind... The traditional combinatorial designs can be used as basic designs for constructing designs of computer experiments which have been used successfully till now in various domains such as engineering, pharmaceutical industry, etc. In this paper, a new series of generalized partially balanced incomplete blocks PBIB designs with m associated classes (m = 4, 5 and 7) based on new generalized association schemes with number of treatments v arranged in w arrays of n rows and l columns (w ≥ 2, n ≥ 2, l ≥ 2) is defined. Some construction methods of these new PBIB are given and their parameters are specified using the Combinatory Method (s). For n or l even and s divisor of n or l, the obtained PBIB designs are resolvable PBIB designs. So the Fang RBIBD method is applied to obtain a series of particular U-type designs U (wnl;) (r is the repetition number of each treatment in our resolvable PBIB design). 展开更多
关键词 Association Scheme Combinatory Method (s) RESOLVABLE PARTIALLY Balanced Incomplete block design U-Type design
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SUZUKI GROUPS Sz(q) AND 2-(v,k,1) BLOCK DESIGNS
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作者 Zhou ShenglinDept. of Math., Shantou Univ., Shantou 515063. 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2002年第1期99-104,共6页
It is proved that if D be a 2|(v,k,1) design with G≤ Aut D block primitive then G does not have a Suzuki group Sz(q) as the socle.
关键词 design AUTOMORPHISM block-primitive point-primitive.
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EMBEDDINGS OF SIMPLE TWO-FOLD BALANCED INCOMPLETE BLOCK DESIGNS WITH BLOCK SIZE FOUR
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作者 WANG JINHUA SHEN HAO 《Chinese Annals of Mathematics,Series B》 SCIE CSCD 2005年第4期643-650,共8页
The necessary and sufficient conditions for the existence of simple incomplete block design (v, ω; 4, 2)-IPBDs are determined. As a consequence, the necessary and sufficient conditions for the embeddings of simple ... The necessary and sufficient conditions for the existence of simple incomplete block design (v, ω; 4, 2)-IPBDs are determined. As a consequence, the necessary and sufficient conditions for the embeddings of simple two-fold balanced incomplete block designs with block size 4 are also determined. 展开更多
关键词 block design SIMPLE EMBEDDING
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On the Existence of (v,3×3,λ)-Splitting Balanced Incomplete Block Design with λ between 2 to 9
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作者 苏仁旺 王金华 《Journal of Shanghai Jiaotong university(Science)》 EI 2008年第4期482-486,共5页
Let (v, u × c,λ)-splitting BIBD denote a (v, u × c,λ)-splitting balanced incomplete block design of order v with block size u × c and index A. The necessary conditions for the existence of a (v, ... Let (v, u × c,λ)-splitting BIBD denote a (v, u × c,λ)-splitting balanced incomplete block design of order v with block size u × c and index A. The necessary conditions for the existence of a (v, u × c,λ)-splitting BIBD are v ≥ uc, λ(v- 1) -- 0 0 mod (c(u- 1)) and Av(v- 1) - 0 mod (c^2u(u- 1)). In this paper, for 2 ≤λ≤ 9 the necessary conditions for the existence of a (v, 3 × 3, λ)-splitting BIBD are also sufficient with one possible exception for (v, λ) = (39, 9). 展开更多
关键词 SPLITTING balanced incomplete block design group-divisible design (GDD)
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General Solution of Normal Equations in the Intra-Block Analysis of PBIB Designs with Four Associates
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作者 Dav inder Kumar Garg Ghansham Mishra 《Journal of Mathematics and System Science》 2013年第8期412-416,共5页
General solution of normal equations in the general intra-block analysis of partially balanced incomplete block designs involving four associates is presented in this talk as they are quite useful in practice. Only in... General solution of normal equations in the general intra-block analysis of partially balanced incomplete block designs involving four associates is presented in this talk as they are quite useful in practice. Only intra-block estimates are given as the necessary formulae for inter-block estimates can be derived from them by changing the parameters as discussed in Rao[5]. We have obtained the general formulae for computation of four types of efficiencies, the average efficiency factor and the variance of the estimated elementary treatment contrast of the four types of comparisons irrespective of the type of association scheme a PBIB Design follows. 展开更多
关键词 Partially balanced incomplete block designs inter- block analysis intra-block analysis.
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Landscape Planning and Design of Folk Culture Block Based on Theory of Three Elements of Landscape
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作者 吴忠军 胡林波 梁莉清 《Journal of Landscape Research》 2010年第9期24-28,共5页
This paper firstly defined the concept of folk culture block,and then analyzed the significance and planning principle of landscape design in folk culture block,and at last expounded landscape planning and design of f... This paper firstly defined the concept of folk culture block,and then analyzed the significance and planning principle of landscape design in folk culture block,and at last expounded landscape planning and design of folk culture block based on theory of three elements of landscape. 展开更多
关键词 THEORY of THREE ELEMENTS of LANDSCAPE FOLK culture block LANDSCAPE planning and design
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ORTHOGONAL GEOMETRIES OVER FINITE FIELDS WITH CHARACTERISTIC≠2 AND BLOCK DESIGNS 被引量:1
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作者 阳本傅 魏万迪 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 1993年第3期269-280,共13页
By taking as blocks certain subspace-pairs of an orthogonal geometry over a finite field with characteristic≠2 we construct some new types of BIB designs and PBIB designs whose parameters are also given.
关键词 ORTHOGONAL GEOMETRIES OVER FINITE FIELDS WITH CHARACTERISTIC AND block designS BIB
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Some Construction Methods of Optimum Chemical Balance Weighing Designs III
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作者 Rashmi Awad Shakti Banerjee 《Open Journal of Statistics》 2016年第1期37-48,共12页
Methods of constructing the optimum chemical balance weighing designs from symmetric balanced incomplete block designs are proposed with illustration. As a by-product pairwise efficiency and variance balanced designs ... Methods of constructing the optimum chemical balance weighing designs from symmetric balanced incomplete block designs are proposed with illustration. As a by-product pairwise efficiency and variance balanced designs are also obtained. 展开更多
关键词 Balanced Incomplete block design Symmetric Balanced Incomplete block design Ternary Balanced block design Variance Balanced design Efficiency Balanced design Nested Balanced Incomplete block design Weighing design Chemical Balance Weighing design Optimum Chemical Balance Weighing design
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Some results on resolvable incomplete block designs 被引量:3
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作者 LIU Minqian & FANG Kaitai Department of Statistics, Nankai University, Tianjin 300071, China Department of Mathematics, Hong Kong Baptist University, Hong Kong, China 《Science China Mathematics》 SCIE 2005年第4期503-512,共10页
This paper is concerned with the uniformity of a certain kind of resolvable incomplete block (RIB for simplicity) design which is called the PRIB design here. A sufficient and necessary condition is obtained, under wh... This paper is concerned with the uniformity of a certain kind of resolvable incomplete block (RIB for simplicity) design which is called the PRIB design here. A sufficient and necessary condition is obtained, under which a PRIB design is the most uniform in the sense of a discrete discrepancy measure, and the uniform PRIB design is shown to be connected. A construction method for such designs via a kind of U-type designs is proposed, and an existence result of these designs is given. This method sets up an important bridge between PRIB designs and U-type designs. 展开更多
关键词 block design discrepancy ORTHOGONAL array supersaturated design U-type design.
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CONSTRUCTION OF OPTIMAL BLOCKING SCHEMES FOR ROBUST PARAMETER DESIGNS 被引量:2
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作者 杨建峰 张润楚 刘民千 《Acta Mathematica Scientia》 SCIE CSCD 2013年第5期1431-1438,共8页
Robust parameter design (RPD) is an important issue in experimental designs. If all experimental runs cannot be performed under homogeneous conditions, blocking the units is effective. In this paper, we obtain the c... Robust parameter design (RPD) is an important issue in experimental designs. If all experimental runs cannot be performed under homogeneous conditions, blocking the units is effective. In this paper, we obtain the correspondence relation between fractional factorial RPDs and the blocking schemes for full factorial RPDs. In addition, we provide a construction of optimal blocking schemes that make all main effects and control-by-noise two-factor interactions estimable. 展开更多
关键词 ALIAS blockING factorial design factorial effect robust parameter design
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Die design and process optimization of die cast V6 engine blocks 被引量:3
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作者 Henry HU Yeouli CHU Patrick CHENG 《China Foundry》 SCIE CAS 2005年第1期21-27,共7页
The use of aluminum, particularly for engine blocks, has grown considerably in the past ten years, and continues to rise in the automotive industry. In order to enhance the quality and engineering functionality of die... The use of aluminum, particularly for engine blocks, has grown considerably in the past ten years, and continues to rise in the automotive industry. In order to enhance the quality and engineering functionality of die cast engine blocks, die design and processes have to be optimized. In this study, a computer simulation software, MAGMAsoft, as an advanced tool for optimizing die design and casting process, was employed to virtually visualize cavity filling and patterns of a V6 engine block. The original die design and process was simulated first to establish a baseline. A reality check was used to verify the predicted results. Then, the die modification with a different runner system was made by using a CAD software, Unigraphics (UG). The simulation on combinations of the modified die design and revised process was performed to examine the effect of die modification and process change on flow filling of V6 engine blocks. The simulated prediction indicates that the enhancement of cavity filling due to the die and process modification minimizes the occurrence of defects during casting, and consequently improves the quality of blocks. The results of mechanical testing show a significant increase in fatigue strengths, and a moderately improvement on tensile properties for the blocks die cast with the new die design and process in comparison with those produced by the original ones. 展开更多
关键词 DIE design SIMULATION ENGINE blockS
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OPTIMIZATION DESIGN OF HYDRAULIC MANIFOLD BLOCKS BASED ON HUMAN-COMPUTER COOPERATIVE GENETIC ALGORITHM 被引量:10
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作者 Feng YiLi LiTian ShujunSchool of Mechanical Engineering,Dalian University of Technology,Dalian 116024, China 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2003年第3期317-320,共4页
Optimization design of hydraulic manifold blocks (HMB) is studied as acomplex solid spatial layout problem. Based on comprehensive research into structure features anddesign rules of HMB, an optimal mathematical model... Optimization design of hydraulic manifold blocks (HMB) is studied as acomplex solid spatial layout problem. Based on comprehensive research into structure features anddesign rules of HMB, an optimal mathematical model for this problem is presented. Usinghuman-computer cooperative genetic algorithm (GA) and its hybrid optitation strategies, integratedlayout and connection design schemes of HMB can be automatically optimized. An example is given totestify it. 展开更多
关键词 Hydraulic manifold blocks (HMB) Human-computer cooperation GENETICALGORITHM Optimization design
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Comparative Analysis on Space Form of Block in Arid Region and Ecological Design Strategy
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作者 Wang Yining Zang Xinyu Chen Tian 《Meteorological and Environmental Research》 CAS 2018年第3期24-29,共6页
Due to unique geographical position and climatic characteristics,there are more economic,social,resource,environmental and other problems in urban construction of arid region. Old urban block of Kashgar and typical bl... Due to unique geographical position and climatic characteristics,there are more economic,social,resource,environmental and other problems in urban construction of arid region. Old urban block of Kashgar and typical block of Masdar ecological city of Abu Dhabi are taken as the research objects. Based on summarizing the characteristics of traditional block and newly built ecological block in arid region,comparative analysis on their space forms and environmental designs is conducted,and the association mechanism between ecological adaptability and space form is generalized. From the aspects of block layout,block space,open space and architectural form,ecological design strategy of the block in arid region is proposed,which could provide the reference for development and construction of ecological city in arid region of China. 展开更多
关键词 Arid region Aho block Masdar ecological city block Ecological design
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Block-Transitive 4-(v,k,4) Designs and Ree Groups
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作者 Shaojun Dai Ruihai Zhang 《Advances in Pure Mathematics》 2016年第5期317-320,共4页
This article is a contribution to the study of the automorphism groups of  designs. Let be a non-trivial  design where for some positive integer , and  is block-transitive. If the socle of G is iso... This article is a contribution to the study of the automorphism groups of  designs. Let be a non-trivial  design where for some positive integer , and  is block-transitive. If the socle of G is isomorphic to the simple groups of lie type, then G is not flag-transitive. 展开更多
关键词 FLAG-TRANSITIVE block-TRANSITIVE T-design Ree Group
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