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Journal articles on the topic 'Incremental Construction'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Bian, Yongming, Jia Jiang, Zhong Jing, Bangxin Han, Anhu Li, and Guangjun Liu. "Design and Application of Hydraulic-Walking Incremental Launching Equipment." Open Construction and Building Technology Journal 7, no. 1 (January 24, 2013): 1–7. http://dx.doi.org/10.2174/1874836801307010001.

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This work designs a novel hydraulic-walking incremental launching equipment. The working principle of the equipment is proposed. Considering that the contact in incremental launching construction is a typical elastic contact problem, and changes in contact state will directly affect the stability of the incremental launching, this work proposes the equilibrium equations of computational contact mechanics and numerical analysis method for the incremental launching equipment through analyzing the working process of the equipments. The proposed model and method are applied in the analysis of typical working conditions of the incremental launching of Donghua Bridge. The structural characteristics in the construction process are analyzed and discussed. The analysis results show that the strength and stability of the steel box girder can meet the construction requirements. The incremental launching of Donghua Bridge was completed successfully. The proposed model and method can be used to predict and analyze the structural performance in incremental launching construction as well as provide theoretical reference and analysis method for similar constructions.

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2

Aurenhammer, Franz, Christoph Ladurner, and Michael Steinkogler. "Incremental Construction of Motorcycle Graphs." Algorithms 15, no. 7 (June 27, 2022): 225. http://dx.doi.org/10.3390/a15070225.

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We show that the so-called motorcycle graph of a planar polygon can be constructed by a randomized incremental algorithm that is simple and experimentally fast. Various test data are given, and a clustering method for speeding up the construction is proposed.

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3

de Berg, M., K. Dobrindt, and O. Schwarzkopf. "On lazy randomized incremental construction." Discrete & Computational Geometry 14, no. 3 (October 1995): 261–86. http://dx.doi.org/10.1007/bf02570705.

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4

Ehrenfeucht, A., T. Harju, and G. Rozenberg. "Incremental construction of 2-structures." Discrete Mathematics 128, no. 1-3 (April 1994): 113–41. http://dx.doi.org/10.1016/0012-365x(94)90107-4.

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5

König, Barbara, and Vitali Kozioura. "Incremental construction of coverability graphs." Information Processing Letters 103, no. 5 (August 2007): 203–9. http://dx.doi.org/10.1016/j.ipl.2007.04.002.

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6

Shin, Jaeho, Sen Wu, Feiran Wang, Christopher De Sa, Ce Zhang, and Christopher Ré. "Incremental knowledge base construction using DeepDive." Proceedings of the VLDB Endowment 8, no. 11 (July 2015): 1310–21. http://dx.doi.org/10.14778/2809974.2809991.

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7

Bittner, Jiří, Michal Hapala, and Vlastimil Havran. "Incremental BVH construction for ray tracing." Computers & Graphics 47 (April 2015): 135–44. http://dx.doi.org/10.1016/j.cag.2014.12.001.

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8

Carrasco, Rafael C., Jan Daciuk, and Mikel L. Forcada. "Incremental Construction of Minimal Tree Automata." Algorithmica 55, no. 1 (February 6, 2008): 95–110. http://dx.doi.org/10.1007/s00453-008-9172-4.

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9

Smith, Gregory T., Sarah Fischer, and Suzannah M. Fister. "Incremental Validity Principles in Test Construction." Psychological Assessment 15, no. 4 (December 2003): 467–77. http://dx.doi.org/10.1037/1040-3590.15.4.467.

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10

Ben-Bassat, Ilan, and Benny Chor. "String graph construction using incremental hashing." Bioinformatics 30, no. 24 (September 2, 2014): 3515–23. http://dx.doi.org/10.1093/bioinformatics/btu578.

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11

De Sa, Christopher, Alex Ratner, Christopher Ré, Jaeho Shin, Feiran Wang, Sen Wu, and Ce Zhang. "Incremental knowledge base construction using DeepDive." VLDB Journal 26, no. 1 (August 4, 2016): 81–105. http://dx.doi.org/10.1007/s00778-016-0437-2.

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12

Carrasco, Rafael C., and Mikel L. Forcada. "Incremental Construction and Maintenance of Minimal Finite-State Automata." Computational Linguistics 28, no. 2 (June 2002): 207–16. http://dx.doi.org/10.1162/089120102760173652.

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Daciuk et al. [Computational Linguistics 26(1):3–16 (2000)] describe a method for constructing incrementally minimal, deterministic, acyclic finite-state automata (dictionaries) from sets of strings. But acyclic finite-state automata have limitations: For instance, if one wants a linguistic application to accept all possible integer numbers or Internet addresses, the corresponding finite-state automaton has to be cyclic. In this article, we describe a simple and equally efficient method for modifying any minimal finite-state automaton (be it acyclic or not) so that a string is added to or removed from the language it accepts; both operations are very important when dictionary maintenance is performed and solve the dictionary construction problem addressed by Daciuk et al. as a special case. The algorithms proposed here may be straightforwardly derived from the customary textbook constructions for the intersection and the complementation of finite-state automata; the algorithms exploit the special properties of the automata resulting from the intersection operation when one of the finite-state automata accepts a single string.

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13

Araya, Shinji, Taketoshi Momohara, and Tuneo Tamati. "Incremental structuring of knowledge baseâincremental construction method of rete network." Systems and Computers in Japan 20, no. 8 (1989): 59–69. http://dx.doi.org/10.1002/scj.4690200806.

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14

Tian, Zhong Chu, Guo Liang Zeng, Min Chen, and Hai Ling Yue. "The Key Technology of Skew Continuous Prestressed Concrete Box Girder Bridges with Incremental Launching Method." Key Engineering Materials 400-402 (October 2008): 639–44. http://dx.doi.org/10.4028/www.scientific.net/kem.400-402.639.

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Incremental launching method is a construction technology for prestressed concrete continuous bridges widely used in China. In the incremental launching method, the superstructure of a bridge is erected from one side of bridge longitudinally to the opposite bank. Compared with other technology for bridge erection methods, it may reduce the cost of labor, shorten the construction period and save the assembly yard. So it is a competitive construction method for medium-span prestressed concrete continuous bridges. A large number of skew bridges will be built especially at mountain area, so it is very necessary to research on incrementally launching method for skew bridges. The objective of the study presented in this paper is to introduce the method used in the Lishui Bridge in Zhangjiajie city of China.

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15

Kamei, Koji, Yutaka Yanagisawa, Takuya Maekawa, Yasue Kishino, Yasushi Sakurai, and Takeshi Okadome. "Incremental Knowledge Construction for Real-World Event Understanding." International Journal of Cognitive Informatics and Natural Intelligence 4, no. 1 (January 2010): 65–79. http://dx.doi.org/10.4018/jcini.2010010104.

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The construction of real-world knowledge is required if we are to understand real-world events that occur in a networked sensor environment. Since it is difficult to select suitable ‘events’ for recognition in a sensor environment a priori, we propose an incremental model for constructing real-world knowledge. Labeling is the central plank of the proposed model because the model simultaneously improves both the ontology of real-world events and the implementation of a sensor system based on a manually labeled event corpus. A labeling tool is developed in accordance with the model and is evaluated in a practical labeling experiment.

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16

Wang, Gang, Shiyin Qin, and Pipei Huang. "Incremental Regression Function Construction with Small Landmarks." IFAC Proceedings Volumes 41, no. 2 (2008): 10075–80. http://dx.doi.org/10.3182/20080706-5-kr-1001.01705.

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17

Totad, Shashikumar G., Geeta R. B., and PVGD Prasad Reddy. "Batch Processing for Incremental FP-tree Construction." International Journal of Computer Applications 5, no. 5 (August 25, 2010): 28–32. http://dx.doi.org/10.5120/910-1288.

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18

Rana, Tauseef, and Abdullah Baz. "Incremental Construction for Scalable Component-Based Systems." Sensors 20, no. 5 (March 6, 2020): 1435. http://dx.doi.org/10.3390/s20051435.

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The availability of smart and intelligent sensors has changed the monitoring, control and maintenance of a conventional and advanced cyber-physical system used in public or private sectors of a society. For example, internet of things (IoT)-based health, agricultural and weather management systems. With the emergence of such sensors, along with the new ways to communicate or coordinate with them, we need to analyze and optimize the system construction processes. In this paper, to address the issue of scalability for bigger and complex systems based on sensors, we redefine an incremental construction process with an emphasis on behavior preservation and study the effectiveness of the use of software component models from the component-based development domain. In this paper, to deal with the issue of scalability, we investigate component-based development approaches with respect to our defined process and propose a taxonomy of component models with respect to component/system behavior. Moreover, based on the outcome of our analysis, we recommend the EX-MAN component model as the most suitable approach. We investigate incremental construction in the context of the three main categories of current component models, namely models where components are: (i) objects, (ii) architectural units and (iii) encapsulated components. Furthermore, to evaluate our defined process and selection of EX-MAN, we designed three examples of systems using our proposed process in EX-MAN component model.

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19

Haluza, Pavel, and Jiří Rybička. "Design of methodology for incremental compiler construction." Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis 59, no. 7 (2011): 137–46. http://dx.doi.org/10.11118/actaun201159070137.

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The paper deals with possibilities of the incremental compiler construction. It represents the compiler construction possibilities for languages with a fixed set of lexical units and for languages with a variable set of lexical units, too. The methodology design for the incremental compiler construction is based on the known algorithms for standard compiler construction and derived for both groups of languages. Under the group of languages with a fixed set of lexical units there belong languages, where each lexical unit has its constant meaning, e.g., common programming languages. For this group of languages the paper tries to solve the problem of the incremental semantic analysis, which is based on incremental parsing. In the group of languages with a variable set of lexical units (e.g., professional typographic system TEX), it is possible to change arbitrarily the meaning of each character on the input file at any time during processing. The change takes effect immediately and its validity can be somehow limited or is given by the end of the input. For this group of languages this paper tries to solve the problem case when we use macros temporarily changing the category of arbitrary characters.

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20

Yeh, Dashing, and Uwe Kastens. "Automatic construction of incremental LR(1)—parsers." ACM SIGPLAN Notices 23, no. 3 (March 1988): 33–42. http://dx.doi.org/10.1145/43895.43899.

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21

Carroll, Steven, and Constantine Polychronopoulos. "A Framework for Incremental Extensible Compiler Construction." International Journal of Parallel Programming 32, no. 4 (August 2004): 289–316. http://dx.doi.org/10.1023/b:ijpp.0000035816.93295.68.

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22

Acharya, Saurav, and Byung Suk Lee. "Incremental causal network construction over event streams." Information Sciences 261 (March 2014): 32–51. http://dx.doi.org/10.1016/j.ins.2013.09.022.

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23

Klein, Rolf, Kurt Mehlhorn, and Stefan Meiser. "Randomized incremental construction of abstract Voronoi diagrams." Computational Geometry 3, no. 3 (August 1993): 157–84. http://dx.doi.org/10.1016/0925-7721(93)90033-3.

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24

Benyagoub, Sarah, Meriem Ouederni, and Yamine Aït-Ameur. "Incremental correct-by-construction of distributed systems." Journal of Computer Languages 57 (April 2020): 100942. http://dx.doi.org/10.1016/j.cola.2020.100942.

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25

Ulaş, Aydın, Murat Semerci, Olcay Taner Yıldız, and Ethem Alpaydın. "Incremental construction of classifier and discriminant ensembles." Information Sciences 179, no. 9 (April 2009): 1298–318. http://dx.doi.org/10.1016/j.ins.2008.12.024.

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26

Dearle, Alan, Quintin Cutts, and Richard Connor. "Using persistence to support incremental system construction." Microprocessors and Microsystems 17, no. 3 (January 1993): 161–71. http://dx.doi.org/10.1016/0141-9331(93)90046-a.

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27

Wang, Xue Wei, Bing Zhu, and Hong Xue Li. "The Key Technology Research of the Pushing Closure Process about Jiashao Bridge Based on Geometric Control Method." Advanced Materials Research 1025-1026 (September 2014): 885–90. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.885.

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Based on the characteristics of the geometric control method during the construction of cable-stayed bridge, the key goal to complete the bridge is to ensure that the non-stress dimensions and profile of every component is constant. Because one of the key points to complete the cable-stayed bridge is to ensure that the non-stress length of the closure segments is constant, it is necessary to adjust the relative position of the final closure by the geometric closure method of incremental launching construction to satisfy the requirement of the non-stress length of the closure segments. Aimed at the critical technical problems existing in incremental launching construction process, taking Jiashao bridge as the research subject, the analysis of the incremental launching plan and the local stress of pushing bracket and bearing block are carried out. The research will provide scientific basis for the feasibility of geometric control incremental launching construction method and it will guarantee the smoothly incremental launching construction.

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28

Park, Byungjae, Jinwoo Choi, and Wan Kyun Chung. "Incremental hierarchical roadmap construction for efficient path planning." ETRI Journal 40, no. 4 (August 2018): 458–70. http://dx.doi.org/10.4218/etrij.2018-0041.

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29

Pengfei Xu, Zhigang Chen, Xiaoheng Deng, and Jianping YU. "An Efficient Implementation of Incremental Construction Voronoi Region." International Journal of Advancements in Computing Technology 4, no. 2 (February 15, 2012): 230–37. http://dx.doi.org/10.4156/ijact.vol4.issue2.28.

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30

Ishii, Hiroshi, Qiang Ma, and Masatoshi Yoshikawa. "Incremental Construction of Causal Network from News Articles." Journal of Information Processing 20, no. 1 (2012): 207–15. http://dx.doi.org/10.2197/ipsjjip.20.207.

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31

KATO, Yoshihide, and Shigeki MATSUBARA. "Incremental Semantic Construction Based on Combinatory Categorial Grammar." IEICE Transactions on Information and Systems E99.D, no. 9 (2016): 2368–76. http://dx.doi.org/10.1587/transinf.2015edp7355.

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32

Lee, Sehyung, Jongwoo Lim, and Il Hong Suh. "Progressive Feature Matching: Incremental Graph Construction and Optimization." IEEE Transactions on Image Processing 29 (2020): 6992–7005. http://dx.doi.org/10.1109/tip.2020.2996092.

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33

Rosidi, Dario. "Incremental Strength Gain Considerations in Staged Roadway Construction." Civil Engineering Dimension 24, no. 2 (October 3, 2022): 125–32. http://dx.doi.org/10.9744/ced.24.2.125-132.

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This paper presents an alternative construction method of a highway along coastal area underlain by thick normally consolidated very soft organic clay. Due to its remote location, mitigations to strengthen the soft clay are deemed too costly and/or require significant time to mobilize. Without mitigations, the presence of this very soft clay necessitates the roadway embankment to be constructed in phases to allow partial consolidation of clayey soils to take place before additional embankment fill can be placed. At each construction phase, the additional fill thickness and staging time are determined, and the corresponding degrees of consolidation and incremental strength gains are calculated at discrete grid points within the soft organic clay. The stability of the partially built embankment is then evaluated, and the fill thickness and staging time are adjusted to meet the stability safety requirements. The settlement due to fill placement can be estimated at each construction phase and included as an overbuilt to the next fill placement thickness. Impacts of soil horizontal and vertical movements due to filling to pile foundations are also be discussed.

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34

Daciuk, Jan, Stoyan Mihov, Bruce W. Watson, and Richard E. Watson. "Incremental Construction of Minimal Acyclic Finite-State Automata." Computational Linguistics 26, no. 1 (March 2000): 3–16. http://dx.doi.org/10.1162/089120100561601.

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In this paper, we describe a new method for constructing minimal, deterministic, acyclic finite-state automata from a set of strings. Traditional methods consist of two phases: the first to construct a trie, the second one to minimize it. Our approach is to construct a minimal automaton in a single phase by adding new strings one by one and minimizing the resulting automaton on-the-fly. We present a general algorithm as well as a specialization that relies upon the lexicographical ordering of the input strings. Our method is fast and significantly lowers memory requirements in comparison to other methods.

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35

Guibas, Leonidas J., Donald E. Knuth, and Micha Sharir. "Randomized incremental construction of Delaunay and Voronoi diagrams." Algorithmica 7, no. 1-6 (June 1992): 381–413. http://dx.doi.org/10.1007/bf01758770.

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36

Câmpeanu, Cezar, Andrei Păun, and Jason R. Smith. "Incremental construction of minimal deterministic finite cover automata." Theoretical Computer Science 363, no. 2 (October 2006): 135–48. http://dx.doi.org/10.1016/j.tcs.2006.07.020.

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37

Zhao, Yanpeng, Yetian Chen, Kewei Tu, and Jin Tian. "Learning Bayesian network structures under incremental construction curricula." Neurocomputing 258 (October 2017): 30–40. http://dx.doi.org/10.1016/j.neucom.2017.01.092.

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38

Wang, Chaoqun, Wenzheng Chi, Yuxiang Sun, and Max Q. H. Meng. "Autonomous Robotic Exploration by Incremental Road Map Construction." IEEE Transactions on Automation Science and Engineering 16, no. 4 (October 2019): 1720–31. http://dx.doi.org/10.1109/tase.2019.2894748.

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39

D'Ambrosio, Bruce. "Incremental construction and evaluation of defeasible probabilistic models." International Journal of Approximate Reasoning 4, no. 4 (July 1990): 233–60. http://dx.doi.org/10.1016/0888-613x(90)90001-i.

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40

Obiedkov, S., and V. Duquenne. "Attribute-incremental construction of the canonical implication basis." Annals of Mathematics and Artificial Intelligence 49, no. 1-4 (July 5, 2007): 77–99. http://dx.doi.org/10.1007/s10472-007-9057-2.

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41

Ellouze, Nebrasse, Nadira Lammari, and Elisabeth Métais. "CITOM: An incremental construction of multilingual topic maps." Data & Knowledge Engineering 74 (April 2012): 46–62. http://dx.doi.org/10.1016/j.datak.2012.02.002.

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42

Morrill, Glyn. "Incremental Processing and Acceptability." Computational Linguistics 26, no. 3 (September 2000): 319–38. http://dx.doi.org/10.1162/089120100561728.

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We describe a left-to-right incremental procedure for the processing of Lambek categorial grammar by proof net construction. A simple metric of complexity, the profile in time of the number of unresolved valencies, correctly predicts a wide variety of performance phenomena including garden pathing, the unacceptability of center embedding, preference for lower attachment, left-to-right quantifier scope preference, and heavy noun phrase shift.

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43

Avram, Mihai, Constantin Bucşan, Despina Duminică, and Daniel Besnea. "Incremental Pneumo-Hydraulic Positioning Unit." Applied Mechanics and Materials 325-326 (June 2013): 778–82. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.778.

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The paper describes the construction of an original linear pneumo-hydraulic positioning unit developed by the authors. The mathematical model that describes the functioning of the unit and the simulation results are also presented.

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44

Wu, Rui, Huan Du, and Qi Wu. "Research on Value-Engineering-Based Construction Costs of Energy-Saving Buildings." Applied Mechanics and Materials 744-746 (March 2015): 2310–13. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.2310.

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With the energy crisis being ever increasingly serious, energy-saving buildings have become a breakthrough for the development of the construction industry. Firstly, this article analyzes the current status of building energy saving in mainland China, and elaborates the necessity of building energy saving in the viewpoint of the entire lifecycle cost by using the value engineering principle. Secondly, this article analyzes the incremental cost of energy-saving buildings and describes the components of the incremental cost. Thirdly, this article analyzes in detail the impact of the incremental cost in the construction phase of buildings by illustrating examples. Finally, this article lists measures and suggestions for cost management to achieve the optimal economic benefits for the entire lifecycle with a minimum incremental cost in the construction phase, resulting in smooth development of energy saving buildings.

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45

Zhan, Fangqiong, and Elizabeth Closs Traugott. "A study of the development of the Chinese correlative comparative construction from the perspective of constructionalization." Diachronica 37, no. 1 (April 7, 2020): 83–126. http://dx.doi.org/10.1075/dia.18025.zha.

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Abstract The paper addresses the emergence and development of the Chinese correlative comparative construction (CrCC) from the perspective of constructionalization. Most previous historical studies of the CrCC take a grammaticalization approach (e.g., Long 2013), focusing mainly on morphosyntax alone rather than investigating syntax and semantics in an integrated way. However, the architecture of construction grammar requires approaching linguistic analysis with both form and meaning equally in mind. This approach suggests that what have sometimes been considered to be merely different formal expressions of the CrCC are in fact two different constructions, one correlative, and the other a simple incremental. We identify the critical contexts (see Diewald & Smirnova 2010) that by hypothesis enabled the constructionalization of the CrCC, and point to the importance of considering network reorganization and multiple sources in the development of the simple incremental construction (see e.g., Boas 2008; Van de Velde et al. 2013).

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46

Tian, Zhong Chu, Lei Yang, and Tian Yong Jiang. "The Application of Fuzzy Comprehensive Evaluation in Risk Assessment of Incremental Launching Bridge." Applied Mechanics and Materials 204-208 (October 2012): 2028–33. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2028.

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The risk factors of continuous incremental launching bridge during construction stage are specialized. The risk in incremental launching stage is analyzed and identified. A risk assessment index system is built. A fuzzy comprehensive evaluation model is developed. The results obtained from the risk assessment model verifies the validity and practicality of the developed method by the combination of analytic hierarchy process and fuzzy mathematics theory. Moderate risk assessment results are developed to provide references for incremental launching construction method.

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47

Qi, Yuan, Siwei Chang, Yingbo Ji, and Kai Qi. "BIM-Based Incremental Cost Analysis Method of Prefabricated Buildings in China." Sustainability 10, no. 11 (November 20, 2018): 4293. http://dx.doi.org/10.3390/su10114293.

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In order to achieve the sustainable growth of its urbanization and natural resources, China has been making great efforts to develop prefabricated construction technologies. However, the high incremental cost of prefabricated buildings (PRBs) is a fundamental obstacle to the latter. The current study mainly focuses on analyzing the incremental cost of the on-site construction stage. It is hard to comprehensively identify the incremental cost composition without considering the incremental cost caused by prefabricated components (PFCs) production. Moreover, the results of incremental cost calculation are not accurate enough by comparing the cost of two similar but different PRB and traditional buildings (TRB), and the case-based calculation results suffer from a lack of representation. To address these issues, we first establish a two-dimensional incremental cost index system from the dimension of cost items and prefabricated technologies to study the incremental cost composition of the whole construction stage. Additionally, based on China’s latest policies documents, the applicability of incremental cost composition items can also be improved. Then a building information modeling (BIM)-based calculation model is presented to avoid the calculation error caused by comparing the cost of two different PRBs and TRBs. To validate the proposed index system and calculation method, an actual prefabricated project in China is also conducted as a case study. The results suggest that: (1) Incremental cost is composed of band bearing and retaining walls and inner walls PFCs production, PFCs hoisting and grouting, post-pouring concrete, and full decoration. (2) The BIM-based incremental calculation result of a PRB case from Shanghai is within the range of the national average PRB incremental estimation results. The incremental cost composition items and BIM-based calculation approach can greatly help investors to identify the largest increase in cost and make effective cost optimization strategies.

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48

Wang, Jin. "The Incremental Launching Construction Technology of Pontoon Pivot Conversion of Large-span Steel Arch Bridge." Journal of the IEST 63, no. 1 (December 1, 2020): 46–52. http://dx.doi.org/10.17764/1557-2196-63.1.46.

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Abstract With the progress of building materials and building technology, the span of bridges is becoming larger and larger. This paper briefly introduces the incremental launching construction technology of a bridge and the incremental launching construction technology of pontoon fulcrum conversion, makes an instance analysis on a large-span steel arch bridge that adopted the incremental launching technology of pontoon fulcrum conversion in Shaoyang, Hunan, China, and makes a simulation calculation on the construction process using Midas civil software. The construction process was monitored using stress sensors and total station. The results showed that the simulation results of the stress and deformation changes of the steel arch bridge in the construction process were close to the actual monitoring data, and the variation trend was basically the same. The finite element model effectively simulated the stress and deformation changes of the steel arch bridge in incremental launching. With the progress of construction conditions, the maximum stress and deformation degree of the arch rib increased first and then decreased, the maximum stress and deformation degree of the main longitudinal beam showed an increase tendency, the maximum stress of the front guide beam increased first and then decreased, and the deformation degree gradually decreased.

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49

Yin, Quanjun, Long Qin, Xiaocheng Liu, and Yabing Zha. "Incremental Construction of Generalized Voronoi Diagrams on Pointerless Quadtrees." Mathematical Problems in Engineering 2014 (2014): 1–14. http://dx.doi.org/10.1155/2014/456739.

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In robotics, Generalized Voronoi Diagrams (GVDs) are widely used by mobile robots to represent the spatial topologies of their surrounding area. In this paper we consider the problem of constructing GVDs on discrete environments. Several algorithms that solve this problem exist in the literature, notably the Brushfire algorithm and its improved versions which possess local repair mechanism. However, when the area to be processed is very large or is of high resolution, the size of the metric matrices used by these algorithms to compute GVDs can be prohibitive. To address this issue, we propose an improvement on the current algorithms, using pointerless quadtrees in place of metric matrices to compute and maintain GVDs. Beyond the construction and reconstruction of a GVD, our algorithm further provides a method to approximate roadmaps in multiple granularities from the quadtree based GVD. Simulation tests in representative scenarios demonstrate that, compared with the current algorithms, our algorithm generally makes an order of magnitude improvement regarding memory cost when the area is larger than210×210. We also demonstrate the usefulness of the approximated roadmaps for coarse-to-fine pathfinding tasks.

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Yavin, Tzahi, Eugene Wang, Hu Zhang, and Michael A. Clayton. "Transition probability matrix methodology for incremental risk charge." Journal of Financial Engineering 01, no. 01 (March 2014): 1450010. http://dx.doi.org/10.1142/s234576861450010x.

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Abstract:

As part of Basel II's incremental risk charge (IRC) methodology, this paper summarizes our extensive investigations of constructing transition probability matrices (TPMs) for unsecuritized credit products in the trading book. The objective is to create monthly or quarterly TPMs with predefined sectors and ratings that are consistent with the bank's Basel PDs. Constructing a TPM is not a unique process. We highlight various aspects of three types of uncertainties embedded in different construction methods: (1) the available historical data and the bank's rating philosophy; (2) the merger of one-year Basel PD and the chosen Moody's TPMs; and (3) deriving a monthly or quarterly TPM when the generator matrix does not exist. Given the fact that TPMs and specifically their PDs are the most important parameters in IRC, it is our view that banks may need to make discretionary choices regarding their methodology, with uncertainties well understood and managed.

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