Object Model Framework for Interface Modeling and IT-Oriented Interface Management

The intense complexity of interfaces in a construction project makes information technology (IT) applications a must for effective interface management (IM). This largely requires a unified, accurate, and efficient way of modeling interface information. Conventionally, interfaces are simply modeled as dependencies/relationships between project entities; various interface information is loosely presented in different ways, which reduces the accuracy and completeness of interface information as well as the efficiency in information exchange and application. This paper introduces an object view of interfaces and its inherent interface object modeling technique, and then presents an interface object model (IOM) framework. The IOM is the first in the literature that aims to systematically define the data structure and dependencies of interface information for modeling. It is at the core of a conceptually proposed systematic model-based IM strategy. When fully developed, the IOM can be used to accurately model multiple types of interfaces. This will greatly enhance the quality and interoperability of interface information, promote IT applications for IM, and ultimately improve interface-related project performance.     

Interface Management for China’s Build–Operate–Transfer Projects

Stringent pressure on public finances has made China’s infrastructure development a “bottleneck” in its bid to sustain rapid economic growth. As a result, many modalities have been developed to utilize the resources and skills of the private sector to supply essential infrastructure products and services, as well as to improve the efficiency in government procurement of the same. The build–operate–transfer (BOT) approach is an important example of these innovative modalities. The BOT approach in China is still in its infancy; many pitfalls await the unwary and obstacles impede more extensive application of this modality. The pitfalls are attributable to the complexities in the BOT approach, particularly when attempted in China’s transition economy emerging from decades of central planning to become one that is more market driven and globally integrated. This paper proposes two systems concepts to help manage this complexity: (1) a process modeling approach that maps key functions, parameters and interfaces in the project delivery process, and (2) the use of interface management involving specific measures that have contributed towards project success in Chinese BOT projects. The process modeling approach has led to the development of China’s BOT generic process model (CBGPM). Expert opinion was elicited on the criticality of the interfaces identified in CBGPM as well as the effectiveness of selected interface management measures. Finally, an interface management framework consisting of five key steps is suggested for China’s BOT projects.     

The use of chemotherapy resistance in cancer treatment

It is not inconceivable that everything except the basic structure of an office building could be prefabricated in the near future. Quality and schedule are nearly always improved with prefabrication due to the simple change from an uncontrolled work environment to a controlled one. One Ludgate Place, is a 23,600 m2, ￡30,000,000 speculative commercial development in central London. This high quality office building has an exposed structural steel frame, within which are fitted prefabricated cladding panels. This paper combines the results from two research programs. The first in the area of prefabrication and the second in the management of high quality cladding construction. The writers describe the Ludgate Place project, incorporating the cladding design, testing, assembly, and installation. Factors that influenced the decision to use prefabrication are presented and evaluated, namely, cost; time; quality; past experience; design; weather joints; performance tests; site logistics; and safety. Construction interfaces and tolerances, particularly between cladding and structure, are discussed, and the future of prefabricated cladding is considered.     

Comparison of Cultures in Construction and Manufacturing Industries

This paper investigates and compares the culture found in a construction company with that found in two manufacturing companies because large differences in culture might reduce the potential for the construction sector to adopt management tools developed in the manufacturing sector. For the comparisons to be valid, the culture within the physical production process was observed. The results were obtained by use of questionnaires and intensive interviews with individual members of staff using a U.K. government sponsored questionnaire. A vertical section of each company was sampled such that equivalent organizational levels could be directly compared. The main findings are that the culture existing in construction has significant differences to that found within the manufacturing industries. It will not be possible to transfer management tools from one industrial sector to the other without substantial redesign. The culture within construction was found to be a “project culture” in comparison to manufacturing, which was found to be a “company culture.”     

Use of a WBS Matrix to Improve Interface Management in Projects

Many researchers agree that smoother construction would result from better communication between designers and constructors about specific requirements and constraints for construction that can be incorporated into the design. The same principle can be generalized to apply to all the phases of a construction project (design, equipment procurement, transport, delivery, installation, and testing, as well as hand-over activities), to the different partners (main contractors, subcontractors, and suppliers), and even internally to the teams working on different parts of a system for the same contractor. Specific requirements and constraints at work interfaces that are technical, organizational, temporal, and geographical in nature have to be made transparent so that they can be managed and resolved to avoid unnecessary reworks and delays. This paper proposes to use the work breakdown structure (WBS) concept to improve work interface management. In the manufacturing industry, the WBS concept is well exploited by crossing a horizontal breakdown of production activities with a vertical breakdown of final products, thus obtaining a WBS matrix, which is more complete and useful than the classical WBS tree. In this paper, the WBS and interface management concepts are first clarified. Then, it is proposed to transpose the WBS matrix concept into the construction industry and to analyze, in a case study, how it may be used to improve interface management. The case study involves the construction of a segment of a mass rapid transit system comprising many specialty trades spanning track works, power supply, signaling, passenger vehicles, and control.     

Legal Issues Associated with Emergent Actor Roles in Innovative U.K. Procurement: Prime Contracting Case Study

Pressure for reform in U.K. construction procurement has led to a move toward relational contracting. Long-term partnerships between clients and construction service providers have enabled traditional construction roles to change radically and the reconfiguration of relationships between these emergent actors. Social network analysis was used to examine the new roles and relationships under an innovative procurement strategy known as prime contracting. This public sector procurement approach involved the introduction of the role of cluster leader combining the skills and knowledge traditionally provided by the architect, the chartered quantity surveyor, and the construction manager. The role of cluster leader was adopted by specialist contractors using existing staff and in the absence of dedicated training. The role was voluntary, however, those performing it were obliged to absorb liabilities relating to design information produced by other actors, financial management on behalf of the prime contractor, and responsibility for the management of the contract period, upon which the contract between the employer and the prime contractor was based. The additional responsibilities associated with the role of cluster leader were accepted without financial compensation, on the basis of maintaining goodwill with the prime contractor and employer. Liabilities arise for the firms and potentially individuals within those firms. There are also concerns about the likelihood of appropriate professional indemnity insurance coverage being available to cluster leaders.     

工程总承包在湘钢燃气电厂项目建设中的应用

业主要求总承包商在超短工期条件下,用10个月的时间完成从合同签订、设计、采购、施工到投产运行全过程。该文详细分析与总结了总承包商是如何运用工程总承包项目管理模式来完成这项工作的。其成功经验可在同类工程中应用。     

浅谈工程总承包项目采购风险管理工作

EPC工程总承包模式有利于整体方案不断优化,能有效克服设计、采购、施工相互制约和脱节的矛盾,有利于项目管理在设计、采购、施工各阶段工作的合理深度交叉。本文以采购管理人员角度,以国内工程总承包项目采购执行阶段的风险管理为研究对象,以风险识别、风险控制的研究思路,提出风险控制措施,降低产生损失的可能性,促进项目达成预定目标。     

Safety Hazard Identification on Construction Projects

Hazard identification is fundamental to construction safety management; unidentified hazards present the most unmanageable risks. This paper presents an investigation indicating the current levels of hazard identification on three U.K. construction projects. A maximum of only 6.7% of the method statements analyzed on these projects managed to identify all of the hazards that should have been identified, based upon current knowledge. Maximum hazard identification levels were found to be 0.899 (89.9%) for a construction project within the nuclear industry, 0.728 (72.8%) for a project within the railway industry, and 0.665 (66.5%) for a project within both the railway and general construction industry sector. The results indicate that hazard identification levels are far from ideal. A discussion on the reasons for low hazard identification levels indicates key barriers. This leads to the presentation of an Information Technology (IT) tool for construction project safety management (Total-Safety) and, in particular, a module within Total-Safety designed to help construction personnel develop method statements with improved levels of hazard identification.     

Procurement Routes in Public Building and Construction Projects

This paper deals with procurement routes in public building and construction projects in Norway. Seen from a practical point of view, as well as from a theoretical one, it is important to improve methods for selection of procurement procedure, contract model, and compensation formats. The paper objective is to find out if public owners select a procurement route according to recommended practice. The sources are literature, support material for two software tools for selection of the procurement route, and documentation from 22 public building and construction projects in Norway. According to the literature and the support material for the two software tools, the answer to what is the proper procurement route will depend on the characteristics of each project. The documentation study implies that public owners continue to select the same procurement route as they are in the habit of. They do not consider what procurement route suits each single project, and therefore they do not select the route according to recommended practice. The paper calls for innovation and better supported selection of the procurement route in public building and construction projects.     

Cross-Cultural Understanding of Construction Project Managers’ Conceptions of Their Work

In recent reforms of the Chinese construction industry, significant efforts have been made toward the introduction of Western project management theories and practices. However, little is known about the extent to which Western project management concepts have been supported by the Chinese culture. Because of certain differences between the two cultures, Chinese managers’ conceptions of their work are likely to be different from their Western counterparts. This paper reports an interpretive comparison of Chinese and U.K. construction project managers’ conceptions of their work. The findings reveal three of the most similar and five of the most different aspects between the two cultural sets of conceptions. The identified similarities reflect some key characteristics inherent in the construction project management profession. Two of the identified differences, namely Chinese emphasis on commercial awareness and U.K. emphasis on health and safety, arise from social structural differences in the two nations, whereas the other three differences, namely Chinese attention to relationships, Chinese concern for their company, and U.K. attention to project contract, are due to the cultural differences between the two nations.     

Formulating Procurement Selection Criteria through Case-Based Reasoning Approach

An appropriate procurement system is a catalyst to the success of a construction project. In practice, the solutions and outcomes of previous procurement selection decisions could be extremely useful in supporting decision making. As a technique that captures and reuses experiential knowledge, case-based reasoning (CBR) has a high potential for modeling the procurement selection decision within a complex dynamic environment. This paper examines the suitability of CBR approaches for procurement selection. The process involved in procurement selection is examined first. A conceptual framework for case-based procurement selection is proposed. The structure of a prototype model on procurement selection criteria (PSC) formulation is presented in this paper. The model applies the CBR approach to procurement criteria selection irrespective of the variability in the characteristics of the client, project, and external environment.     

Communication Patterns in Construction at Construction Manager Level

The procurement process of construction projects has been affected by developments in the field of Information Technology, as well as by the need to cope with growing technological challenges stemming from the integration of multiple building systems into tall and complex buildings. Furthermore, since the procurement phases are undertaken simultaneously, project complexity is increased, and increased integration among them is therefore required. These constraints have made the management of complex construction projects less of an architectural and engineering issue and more of a managerial one. In turn, this has led to an increasing use of the “construction management” concept in the procurement process. This study focused on communications in construction management procurement of building and residential projects in Israel. Communications between the construction manager and the design team were found to be vital in ensuring adherence to project objectives. Communication means were classified as “formal”—written technical information, and as “informal”—verbal communications. Construction managers in Israel still use informal communications in 50% of their interactions with their project counterparts. The study concludes that design capabilities should be one of the essential qualifications required of a construction management firm. In addition to the more traditional responsibilities, such as planning, scheduling, and coordination, the scope of the construction manager’s professional duties should emphasize the aspect of quality management.     

Impacts of Overseas Management Structures on Project Buyout Management: Case Studies of Chinese International Contractors

Project buyout management is essential for the transition from the preconstruction to the construction phase. It is during this period that the project team is formed; subcontractors are finalized; the orders of material and equipment are placed; and project plans are made. Despite its importance, few studies have been conducted in this field, especially for international contractors who face many complex situations in project buyout. This paper presents the study conducted for the project buyout management for the Chinese International Contractors (CICs) in developing countries, with focus on the project buyout management under different overseas management structures, and the key influencing factors. It discusses the characteristics of CICs in developing countries; investigates the project buyout management under different overseas management structures; analyzes the advantages and disadvantages of each overseas management structure to project buyout, and identifies the major project buyout influencing factors. The results of this research will benefit both the industry practitioners and the academic researchers in this area.     

Model for Financial Renegotiation in Public-Private Partnership Projects and Its Policy Implications: Game Theoretic View

Today, government is no longer considered the sole provider of public works or services. Public-private partnership (PPP) has been recognized as an important approach to solving problems for governments in providing infrastructure systems. However, the joint ownership or partnership in PPP complicates the administration of PPP projects. Too often, in PPP, many serious problems occur mainly because of bad administration policies. In particular, the fact that government may rescue a distressed project and renegotiate with the developer causes major problems in project procurement and management. This paper aims to study when and how government will rescue a distressed project and what impacts government’s rescue behavior has on project procurement and management. A game-theory based model for government rescue dynamics is developed. Propositions, corollaries, and important policy implications are then derived from the model. This pilot study, the writer hopes, may provide theoretic foundations to policy makers for prescribing effective PPP procurement and management policies and for examining the quality of PPP policies. The study can also offer researchers a framework and a methodology to understand the behavioral dynamics of the parties in PPP.     

Development of Causal Model of Construction Accident Causation

Accidents occur in all types of construction activities. The accident causation process is complex. Accident prevention requires a comprehensive understanding of this complex process. This paper proposes a conceptual, but practical, model of accident causation for the construction industry, highlighting the underlying and complex interaction of factors in the causation process. The model describes the constraints and responses experienced by the parties involved in project conception, design, and construction, which may affect accident causation. This paper details theoretical findings of research currently being conducted at UMIST. Both proximal and distal factors are considered (for example, operative factors, site environment and systems of work, and project management and organizational issues). A study of 500 accident records provided by the U.K. Health and Safety Executive shows that accidents in construction projects involve inappropriate construction planning (28.8%), inappropriate construction control (16.6%), inappropriate construction operation (88.0%), inappropriate site condition (6.0%), and inappropriate operative action (29.9%). Data currently available are, in some respects, inadequate and will need to be supplemented, in the future, by extended accident investigations.     

Optimizing Material Procurement and Storage on Construction Sites

Efficient planning of materials procurement and storage on construction sites can lead to significant improvements in construction productivity and project profitability. Existing research studies focus on material procurement and storage layout as two separate planning tasks without considering their critical and mutual interdependencies. This paper presents the development of a new optimization model for construction logistics planning that is capable of simultaneously integrating and optimizing the critical planning decisions of material procurement and material storage on construction sites. The model utilizes genetic algorithms to minimize construction logistics costs that cover material ordering, financing, stock-out, and layout costs. The model incorporates newly developed algorithms to estimate the impact of potential material shortages on-site because of late delivery on project delays and stock-out costs. An application example is analyzed to demonstrate the capabilities of the construction logistics planning model in simultaneously optimizing material procurement decisions and storage layout plans.     

Influence of Project Type and Procurement Method on Rework Costs in Building Construction Projects

While it is widely recognized that additional costs due to rework can have an adverse effect on project performance, limited empirical research has been done to investigate the influencing factors. The research presented in this paper aims to determine the influence of different project types and procurement methods on rework costs in construction projects. Using a questionnaire survey, rework costs were obtained from 161 Australian construction projects. The direct and indirect consequences of rework are analyzed and discussed. It is shown that, contrary to expectation, rework costs do not differ relative to project type or procurement method. In addition, it was found rework contributed to 52% of a project’s cost growth and that 26% of the variance in cost growth was attributable to changes due to direct rework. To reduce rework costs and therefore improve project performance, it is posited that construction organizations begin to consider and measure them, so that an understanding of their magnitude can be captured, root causes identified, and effective prevention strategies implemented.     

真空轧制825合金/X65钢复合板的组织性能

 针对油气输送领域对耐H2S腐蚀油气复合管线的需求,采用真空轧制复合技术成功制备出825镍基合金/X65高强管线钢复合板。真空轧制复合技术是基于真空电子束焊接和热轧复合所开发出的一种新型复合技术,在高真空、高温和强塑性变形条件下,复合界面实现优异的冶金结合。采用X65/825合金/825合金/X65的4层对称复合轧制模式,并对复合界面的微观组织和力学性能特征进行分析。研究表明,复合界面连续平直,无孔洞和裂纹等缺陷,镍、铬和铁元素在界面两侧发生明显的扩散,另外复合界面生成一条连续的厚度约为1 μm的TiC薄带,在结合界面离散分布少量的颗粒状Al2O3化合物。界面平均剪切强度为404 MPa,拉剪断裂在复合界面处。     

Toward a New Paradigm: Simultaneous Use of Multiple Project Delivery Methods

Since World War II, the American Strategy for infrastructure procurement has evolved to rely primarily upon a single delivery method, design∕bid∕build. While this strategy was used to implement massive federal investment in highways, transit systems, and wastewater treatment, it has restricted state and local flexibility in aligning the procurement process to achieve best value for locally funded projects. The engineering, procurement, and construction community in the United States has now recognized the limitations of a procurement process designed to support a single delivery method. Change is coming, and the transition to a new process will challenge public owners in novel, but meaningful ways. This paper focuses upon shifting from the current paradigm toward a new model that supports simultaneous use of multiple project delivery methods. The discussion and frameworks provided are the result of a variety of research efforts by the Infrastructure Systems Development Research team at the Massachusetts Institute of Technology. Studies of the history of American Infrastructure, analyses of case studies across the country, development of decision support models for capital programming, and real applications to municipal infrastructure planning provide the underpinnings for the results and conclusions presented.