10 results on '"resources constraint"'
Search Results
2. A Study of Schedule Risk of Overseas Construction Projects Based on Resource Constraint Factor Classification.
- Author
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ZHOU Wei-hong
- Abstract
At present, the contactors with overseas construction projects are encouraged to go out with the "going out strategy". As a result, the project size, type, distribution has changed a lot, the construction-schedule risk has increasingly intensified. Affected by resources, the contractors face big challenges in management. This study analyzes the type, importance, and specialization of resources to illustrate the importance of resource for the implementation of overseas construction projects. Based on literature review and expert survey, we identify and classify the overseas construction-project-schedule risks under resource constraints from the viewpoints of the contractor. The analytic hierarchy process is used to analyze and rank the weight of factors, and establishes the classification system under the resources constraint of overseas construction-project-schedule risk. The findings of this study can provide guidance for the contractors to prevent and manage the international construction-project-schedule risk. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
3. Parallel Machine Scheduling with Resources Constraint and Sequence Dependent Setup Times
- Author
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Hou, Zheng-liang, Guo, Xiu-ping, and Dou, Runliang, editor
- Published
- 2013
- Full Text
- View/download PDF
4. Operation Loop-Based Optimization Model for Resource Allocation to Military Countermeasures versus Probabilistic Threat.
- Author
-
Wan, Chunqi, Zhang, Xiaoxiong, Zhao, Qingsong, and Yang, Kewei
- Subjects
RESOURCE allocation ,DECISION making ,SYSTEM dynamics - Abstract
Weapons development planning is an unstructured and complex multi-criteria decisionmaking problem, especially in antagonistic environments. In this paper, the defender's decision was modelled as a high complexity non-linear optimization problem with limited resources. An operation loop with realistic link rules was first proposed to model the cooperation relationships among weapons in the defense system. The system dynamics principle was used to characterize the dynamic behavior of the nodes in a complex weapons network. Then, we used cumulative threat and development risk to measure different planning solutions by considering the opponent and uncertainties in the development process. Next, an improved Differential Evolution (DE) and Non-Dominated Sorting Differential Evolution (NSDE) were designed to determine the optimal planning solutions for a single objective and multi-objective. The compromise solution, based on the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS), was used to evaluate the Pareto solution set of the multi-objective. Finally, an illustrative case was studied to verify the feasibility and validity of the proposed model. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
5. Operation Loop-Based Optimization Model for Resource Allocation to Military Countermeasures versus Probabilistic Threat
- Author
-
Chunqi Wan, Xiaoxiong Zhang, Qingsong Zhao, and Kewei Yang
- Subjects
weapons development planning ,resources constraint ,operation loop ,optimization model ,threat ,development risk ,DE ,NSGA-II ,TOPSIS ,Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Biology (General) ,QH301-705.5 ,Physics ,QC1-999 ,Chemistry ,QD1-999 - Abstract
Weapons development planning is an unstructured and complex multi-criteria decision-making problem, especially in antagonistic environments. In this paper, the defender’s decision was modelled as a high complexity non-linear optimization problem with limited resources. An operation loop with realistic link rules was first proposed to model the cooperation relationships among weapons in the defense system. The system dynamics principle was used to characterize the dynamic behavior of the nodes in a complex weapons network. Then, we used cumulative threat and development risk to measure different planning solutions by considering the opponent and uncertainties in the development process. Next, an improved Differential Evolution (DE) and Non-Dominated Sorting Differential Evolution (NSDE) were designed to determine the optimal planning solutions for a single objective and multi-objective. The compromise solution, based on the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS), was used to evaluate the Pareto solution set of the multi-objective. Finally, an illustrative case was studied to verify the feasibility and validity of the proposed model.
- Published
- 2018
- Full Text
- View/download PDF
6. 基于资源预留的成像卫星鲁棒性任务规划方法.
- Author
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张忠山, 谭跃进, 义余江, and 邢立宁
- Subjects
- *
IMAGING systems , *PLANNING , *TASKS , *BATTERY storage plants , *EXECUTIVE ability (Management) , *MANAGEMENT - Abstract
As the development of imaging satellites in autonomous, robust task planning became an urgent theory and practice problem need to be solved. After comprehensively considering constraints involving transformation time between tasks, satellite storage, battery usage and others, a robust planning model is established. On the premise that optimal profits of satellite mission planning is ensured, we propose a robustness planning method for imaging satellite based on resources reservation. The resources reservation rule and the constraint of transform time between tasks assured the efficiency of resources using and tasks arrangement. Experiments are conducted on different scale of instances. The results demonstrate the robustness of this method. This method also can be used as guidance in other related planning problem. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
7. Resources Constraint, Energy Substitution and Sustainable Development: A Review on Abroad References of Growth Theory.
- Author
-
Cao Yushu and You Zhuoya
- Abstract
Natural resources, one of the most important elements in the process of economic development, are defined as pure production cost under the traditional economics in discussing impetus for development. Consequently, the role of natural resources does not receive enough attention. After the 1970s, with the establishment of new growth theoretical models, scholars began to study the reciprocal conditions for the harmonious development of economy and resources. Studies based on the exogenous growth model and the endogenous growth model are mainly concerned with three aspects: the finiteness of non-renewable resources, the impact of the progress of energy technology on economic development and the role placed by renewable resources in energy substitution and sustainable development. [ABSTRACT FROM AUTHOR]
- Published
- 2010
- Full Text
- View/download PDF
8. Project selection & portfolio considering strategy orientation and resource limitation - Huashi Installation Engineering Company
- Author
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Luo Wei, Pereira, Leandro, and Yan Pengyu
- Subjects
M11 ,Project portfolio management ,O22 ,M Business administration and business economics - Marketing - Accounting - Personnel economics ,Construção e instalação de projetos ,O Economic development, innovation, technological change, and growth ,Construction and installation projects ,Avaliação e seleção ,Constrangimento de recursos ,Evaluation and selection ,Resources constraint ,Gestão de portfolio de projetos ,Ciências Sociais::Economia e Gestão [Domínio/Área Científica] - Abstract
With the rapid development of Chinese construction and installation industry, many companies undertook various types of construction and installation projects in the past decades. However, it is observed that most of these companies just focused on their cash flows when they make decisions on project selection. It is true that the cash flow is a fundamental and important metric but this metric hardly reflects the comprehensive effects of projects on the companies’ development and strategy implementation. Thus, besides the cash flow metric, the company’s strategic objectives in terms of technology innovation, management innovation, and social responsibility need to be involved in the procedure of project portfolio and selection. On the other hand, scarce resources in a company hardly support executions of all candidate projects simultaneously, and thus the allocation of scarce resources within the portfolio has to be considered additionally. Otherwise, there may be some conflicts of using the resources within the selected projects in practice. In the existing literature, it has been proved that a reasonable project portfolio management is an effective way to implement company strategy through the success of the selected projects. Some research has proposed general frameworks and methods for project selection and portfolio with respect to the company’s strategy. However, these general frameworks and methods are hardly directly applied to a specific industry and company since they fail to capture the characteristics of a specific industry and companies. Moreover, some existing researchers have enforced the resources limitation into their project selection and portfolio procedure. However, in the operational levels, the allocation of scarce resources among the selected projects is seldom considered and integrated to the project selection and portfolio procedure, which results in that the generated project portfolio scheme is impractical or cannot be carried out in specific industry and company. Motivated by both industry and existing literature, this thesis studies project portfolio problem with considering a company’s strategy and resource allocation. The following two questions are addressed in this study: 1) How to comprehensively evaluate projects according to a company's predetermined strategy? 2) How to select projects and allocate scarce resources in order to maximize the whole strategic contribution of the project portfolio? portfolio? To answer the first question above, we first decompose a company's predetermined strategic goal into four objectives: financial objective, management innovation, technological innovation, and social responsibility . We t hen apply the analytic hierarchy process (AHP) method to establish a project evaluation system composed of hierarchical criteria and the relative weights of the criteria to the strategic goal. To solve the second question, we define an evolution metric to measure a project’s contribution ratio to the strategic goal by consuming per unit scarce resource. We then formulate the second problem as a 0 1 Knapsack problem by mixed integer programming method and further develop a heuristic rule to determine the allocation of the scarce resource among the selected projects. Finally, the proposed project evaluation system and resource allocation approaches are applied to a real case in Huashi Installation Engineering Company (HIEC), a state owned installation engineering enterprise in Sichuan Province of China. The application results show that our approach helps HIEC to improve the performance of the project portfolio management. The results of this thesis give some inspiration and guidelines to project portfolio management in the construction and installation of industry and other industries in China. Com o rápido desenvolvimento da indústria chinesa de construção, muitas empresas empreenderam vários tipos de projetos de construção e instalação nas últimas décadas. No entanto, constatou-se que a maioria dessas empresas se concentra apenas em fluxos financeiros quando tomam decisões sobre a seleção de projetos. É um facto que os fluxos financeiros constituem-se como uma métrica fundamental e importante, no entanto essa métrica dificilmente reflete os efeitos abrangentes dos projetos sobre o desenvolvimento das empresas e a sua implementação estratégica. Assim, além da métrica dos fluxos financeiros, os objetivos estratégicos das empresas em termos de inovação tecnológica, gestão da inovação e responsabilidade social precisam de estar envolvidos num processo de seleção e gestão de portfólio de projetos. Por outro lado, os poucos recursos existentes numa empresa dificilmente suportam a execução de diversos projetos a que uma empresa se candidate em simultâneo, portanto, a alocação dos poucos recursos existentes dentro do portfólio de projetos tem que ser considerada adicionalmente. Caso contrário, poderão existir alguns conflitos sobre a gestão dos projetos que se encontram em execução. Durante a revisão de literatura, foi verificado que uma gestão equilibrada do portfólio de projetos traduz-se numa maneira efetiva de implementar a estratégia de uma companhia através do sucesso dos projetos selecionados. Foi efetuada uma pesquisa que propôs uma metodologia geral bem como métodos para a seleção de portfolios de projetos em linha com a estratégia da empresa. No entanto, essas estruturas e métodos gerais dificilmente são aplicados diretamente a uma indústria ou a uma empresa específica, uma vez que não conseguem capturar as características específicas dessa indústria ou empresa. Além disso, alguns autores reforçaram, o facto das limitações dos recursos nos seus projetos e processos de portfólio. No entanto, em níveis operacionais, a alocação de recursos dispersos entre os diversos projetos selecionados é raramente considerada e integrada no processo de seleção do portfólio de projetos, ou seja, a estrutura do portfólio em projeto não é realista ou então não pode ser colocada em prática numa indústria ou empresa específica. Motivado pela indústria e pela literatura existente, esta tese estuda o problema do portfólio de projetos considerando a estratégia definida por uma empresa e a sua alocação de recursos. Neste estudo são abordadas duas questões: 1) como avaliar de forma abrangente os projetos de acordo com a estratégia predefinida de uma empresa? 2) como selecionar projetos e alocar os poucos recursos para maximizar toda a contribuição estratégica do portfólio de projetos? Para responder à primeira questão, primeiro é desagrupado o objetivo estratégico pré definido de uma empresa e m quatro grandes objetivos: objetivo financeiro, gestão de inovação, inovação tecnológica e responsabilidade social. Em seguida, aplicamos o método do processo de hierarquia analítica (AHP) para estabelecer um sistema de avaliação de projeto composto por critérios hierárquicos e ponderações relativas para a definição do objetivo estratégico. A resposta à segunda questão foi obtida através da elaboração de uma métrica evolutiva que permitiu medir o rácio de contribuição de um projeto para um objetivo estratégico através da análise da contribuição de cada recurso num dado projeto. Posteriormente, foi definido o segundo problema como um problema 0 1 Knapsack através da programação linear mista e, em seguida, através de uma função heurística que permitiu determinar a alocação dos poucos recursos existentes numa determinada empresa aos projetos selecionados. Por fim, o sistema evolutivo proposto e as métricas de alocação dos recursos existentes foram aplicados a um caso real, nomeadamente à empresa de engenharia Huashi (HIEC), uma empresa pública chinesa localizada na província de Sichuan. Os resultados da aplicação destes modelos demonstraram que a abordagem desenvolvida ajudou a HIEC a melhorar substancialmente o seu desempenho na gestão do portfólio de projetos. Os resultados desta tese providenciaram conhecimento e linhas gerais contributivas uma eficaz para a gestão do portfólio de projetos das diversas industrias na China.
- Published
- 2019
9. Operation Loop-Based Optimization Model for Resource Allocation to Military Countermeasures versus Probabilistic Threat
- Author
-
Kewei Yang, Chunqi Wan, Qingsong Zhao, and Xiaoxiong Zhang
- Subjects
development risk ,Mathematical optimization ,Optimization problem ,NSGA-II ,Computer science ,0211 other engineering and technologies ,02 engineering and technology ,lcsh:Technology ,DE ,lcsh:Chemistry ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,threat ,TOPSIS ,lcsh:QH301-705.5 ,Instrumentation ,weapons development planning ,Fluid Flow and Transfer Processes ,021103 operations research ,lcsh:T ,Process Chemistry and Technology ,optimization model ,General Engineering ,Probabilistic logic ,Sorting ,Ideal solution ,operation loop ,resources constraint ,lcsh:QC1-999 ,Computer Science Applications ,System dynamics ,lcsh:Biology (General) ,lcsh:QD1-999 ,lcsh:TA1-2040 ,Differential evolution ,Resource allocation ,020201 artificial intelligence & image processing ,lcsh:Engineering (General). Civil engineering (General) ,lcsh:Physics - Abstract
Weapons development planning is an unstructured and complex multi-criteria decision-making problem, especially in antagonistic environments. In this paper, the defender’s decision was modelled as a high complexity non-linear optimization problem with limited resources. An operation loop with realistic link rules was first proposed to model the cooperation relationships among weapons in the defense system. The system dynamics principle was used to characterize the dynamic behavior of the nodes in a complex weapons network. Then, we used cumulative threat and development risk to measure different planning solutions by considering the opponent and uncertainties in the development process. Next, an improved Differential Evolution (DE) and Non-Dominated Sorting Differential Evolution (NSDE) were designed to determine the optimal planning solutions for a single objective and multi-objective. The compromise solution, based on the Technique for Order Preference by Similarity to an Ideal Solution (TOPSIS), was used to evaluate the Pareto solution set of the multi-objective. Finally, an illustrative case was studied to verify the feasibility and validity of the proposed model.
- Published
- 2018
- Full Text
- View/download PDF
10. Detailed land use transition quantification matters for smart land management in drylands: An in-depth analysis in Northwest China.
- Author
-
Lü, Da, Gao, Guangyao, Lü, Yihe, Xiao, Feiyan, and Fu, Bojie
- Subjects
LAND management ,LAND use ,LAND cover ,SUSTAINABLE development ,LAND degradation - Abstract
• Enhanced transition matrix was used to investigate land cover change details. • Cultivated land expansion was suitable within 200-1400 m from settlements and 1000 m from water courses. • Resources constraint was critical for land use change and oasis evolution in drylands. Due to the lack of smart land management strategies, the rapid expansion of cultivated oases usually results in water imbalances and land degradation in drylands. Management strategies require an in-depth detection of the modes and mechanisms of local land use change. In this study, to detect the process and spatial pattern of land use change and quantify the spatial relations between oasis expansion and the sources of water and human disturbances, enhanced analysis of land transition matrix and location relationship-based spatial analysis were conducted from 1990 to 2015 in the middle reaches of the Heihe River Basin (M-HRB), a typical arid inland river basin in China. The results indicated that cultivated land and desert together accounted for more than 90 % of the study area. In the M-HRB, cultivated land expansion was an obvious process of land use change. Most of the new cultivated land was reclaimed from desert, but the conversion of grassland to cultivated land was the dominant signal of systematic land transition. Swap changes gradually became the main land transition process from 1990 to 2015. The cultivated land showed a close spatial relationship with land and water resources availability, which also constrained the distribution of cultivated land expansion (i.e., within 200-1400 m of human settlements and within 1000 m of water courses or ditches). The quantification results can be used to facilitate smart land management strategies towards sustainable development in the M-HRB. The methods used here can be adapted to other dryland areas for land change detection that supports sustainable land management. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
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