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Showing 9 results for Yi

I. Yitmen,
Volume 10, Issue 4 (December 2012)

Learning rapidly and competently has become a pre-eminent strategy for improving organizational performance in the

new knowledge era. Improving dynamic learning capability is an exclusive strategy for corporate success in construction

industry. Thus engineering design firms should implement OL to accomplish a state of readiness for change and develop a

competence to respond and identify future business potentials. This study aims to analyze the relationship between

organizational learning (OL) and performance improvement (PI) in civil engineering design firms of Turkish construction

industry. OL structure in engineering design firms incorporates five constructs: organizational environment, strategy

development and implementation, supportive leadership, leveraging knowledge, and learning capability. The empirical data

was collected through a questionnaire survey conducted to engineering design firms registered to the Turkish Chamber of Civil

Engineers. The hypothesized model relationships were tested using Structural Equation Modeling (SEM). The results show that

each of the variables has a different role and significant positive impact on the OL process and organizational PI. The variables

“Supportive leadership” and “Learning capability” proved to be strongly significant and positively related to organizational

performance in engineering design firms. In engineering design firms, supportive leadership is needed in order to establish a

participative cultural environment that helps design a new form of organization which emphasizes learning, flexibility, and

rapid response. Learning capability is the potential to explore and exploit knowledge through learning flows that make possible

the development, evolution and use of knowledge stocks enacting engineering design firms and their members to add value to

the design business.

J. S. Yi, C. W. Koo, S. H. Park, O. K. Kwon,
Volume 11, Issue 1 (TransactionA: Civil Engineering, March 2013)

Construction industry consists of several phases in which a variety of stakeholders are involved. As construction projects are becoming larger, more complex and more diverse, the design phase has been more important factor for the success of projects than ever before. However, it is considered that most of design work occurred in actual design process is intangible. Such recognition makes the design phase more unsystematic and arbitrary, which finally weakens the competitiveness of whole project. In order to solve these problems, this study developed a web-based system for integrated design management (IDMS) which consists of 8 modules including design document, schedule, quality, and building permit management. This section is intended to validate the system implementation and its effectiveness. Two characteristics have made this research significantly different from previous studies. First of all, users of the system including architects and other design professionals were continuously involved starting from the development phase to the validation phase. The other unique characteristic is that the actual design project was applied as a test bed in the final verification stage. The research team applied the actual data which had been generated while each business process, and verified the effectiveness of system implementation. The authors expect that such a user-centered approach enable the system more robust and effective.
Jui-Chao Kuo, Teng-Yi Kuo, Cheng-Han Wu, Shih-Heng Tung, Ming-Hsiang Shih , Wen-Pei Sung, Weng-Sing Hwang,
Volume 12, Issue 2 (Transaction A: Civil Engineering, June 2014)

In this study digital image correlation (DIC) technique combined with a high speed video system was used to predict movement of particles in a water model. Comparing with Particle-image velocimetry (PIV) technique, it provides a low cost alternative approach to visualize flow fields and was successfully employed to predict the movement of particles in a water model at different submergence depth using gas injection. As the submergence depth increases, the number of the exposed eye is reduced accordingly. At 26.4 cm submergence depth, an exposed eye was found at 1/3 of the submergence depth, whereas two exposed eyes were observed at 1/2 depth and near the bottom wall at 24 cm submergence depth.
L. Kalani Sarokolayi, B. Navayi Neya, Javad Vaseghi Amiri,
Volume 13, Issue 1 (Transaction A: Civil Engineering March 2015)

This study focuses on non-linear seismic response of a concrete gravity dam subjected to translational and rotational correlated components of ground motions including dam-reservoir interaction. For this purpose rotational components of ground motion is generated using Hong Non Lee improved method based on corresponding available translational components. The 2D seismic behavior of the dam concrete is taken into account using nonlinear fracture mechanics based on the smeared- crack concepts and the dam-reservoir system are modeled using Lagrangian-Lagrangian approach in finite element method. Based on presented formulation, Pine Flat concrete gravity dam is analyzed for different cases and results show that the rotational component of ground motion can increase or decrease the maximum horizontal and vertical displacements of dam crest. These results are dependent on the frequency of dam-reservoir system and predominant frequencies of translational and rotational components of ground motion.
I. Yitmen,
Volume 13, Issue 2 (Transaction A: Civil Engineering June 2015)

The purpose of this study is to investigate the influence of cross-cultural communication (CCC) on stakeholder management process (SMP) in international construction projects from the Turkish stakeholders’ perspective. The research is based on a survey of Turkish stakeholders (contractors, consulting engineers, insurance brokers, and financial advisors) operating internationally. The useable survey comprised 141 individual responses from 205 distributed, giving a response rate of 68.78 percent. Structural equation modelling (SEM) is proposed as an effective tool to investigate the relations between various factors of cross-cultural communication and stakeholder management process and data regarding the Turkish stakeholders have been used to demonstrate its applicability. The results demonstrate that “Communication behaviours” and “Communication strategies” proved to be strongly significant and positively related to SMP, whereas “Communication barriers” have significantly negative effect on SMP. Research findings may encourage the principles and practices of CCC between the stakeholders to be adequately recognized and understood by the international contracting firms operating abroad. Although findings reflect the Turkish stakeholders’ perspectives, it is believed that the parameters identified in this study can further be used as a benchmark to conduct similar studies in other countries. Managers of international contracting firms can develop a Cross-cultural Communication Statement (OCQS) to assess, report, and develop cross-cultural communication between stakeholders of a multi-cultural project environment.
Mr. L. Yanlong, Mr. L. Shouyi, Mr. Y. Yang, Miss T. Xing,
Volume 13, Issue 4 (Transaction A: Civil Engineering December 2015)

This study simulates the temperature field and temperature stress of concrete face slabs, considering the cold waves that occur during construction as well as the contact friction between the face slabs and the cushion layer. The results show that when a cold wave occurs during construction, the surface and center temperature of the face slabs continually drop with the outside air temperature, with the surface temperature drop being the largest. In addition, the surface and center of face slabs are subjected to tensile stress, with the maximum principal stress on the surface being greater than that on the center. The maximum principal stress of the surface and center occurs at approximately half of the dam height. This study also examines the surface insulation of concrete face slabs. Surface insulation can significantly improve the temperature drop range and the maximum principal stress amplitude caused by the cold wave. A stronger heat preservation results in smaller tensile stress and an increase in the amplitude of face slabs.

Abdulazim Yildiz, Firdevs Uysal,
Volume 14, Issue 2 (Transaction B: Geotechnical Engineering 2016)

This paper investigates the time dependent behaviour of Sunshine embankment on soft clay deposit with and without prefabricated vertical drains. An elasto visco-plastic model was used to investigate the influence of anisotropy and creep effect on the settlement behaviour of the embankment. The constitutive model, namely ACM accounts for combined effects of plastic anisotropy and creep. For comparison, the problem is also analysed with isotropic Modified Cam Clay model which does not consider creep effect. To analyse the PVD-improved subsoil, axisymmetric vertical drains were converted into equivalent plane strain conditions using two different mapping approaches. The results of the numerical analyses are compared with the field measurements. The numerical simulations suggest that the anisotropic creep model is able to give a better representation of soft clay response under an embankment loading. The isotropic model which neglects effects of anisotropy and creep may lead to inaccurate predictions of soft clay response. Additionally, the numerical results show that the mapping method used for PVD improved soft clays can accurately predict the consolidation behaviour of the embankment and provide a useful tool for engineering practice.

Onyebuchi Nwabueze Mogbo, Balkiz Yapicioglu, Ibrahim Yitmen,
Volume 15, Issue 5 (Transaction A: Civil Engineering 2017)

There are challenges and opportunities of deploying policies for transport infrastructure improvement in developing countries. Transport infrastructural development remains a major tool for achieving the aspirations of the newly introduced economic principles of the Federal Government of Nigeria. This study investigates the impact of innovative strategic approaches for improved transport policy and how the strategies are well incorporated to solve the problems faced in the infrastructure sector in order to enhance improved economic growth. The research involves a questionnaire survey conducted to key stakeholders in Nigerian six states. The study was focused on the stakeholders selected from the public entities, private clients, consultants, and contractors operating within the Nigerian construction sector. Based on the empirical data, the specific ways in which innovative strategies for transport policies affect infrastructure development contributing to sustainable economic growth have been shown. The findings contribute to the fields of innovative strategies for transport policies in infrastructure development by linking various aspects of innovative strategies for transport policies and infrastructure development and their interrelationships to sustainable economic development from stakeholders’ perspective. The results show that variables of innovative strategies in transportation and transportation infrastructure improvement have different roles and significant positive impact on sustainable economic development.

Arash Sadrayi, Mahmoud Saffarzadeh, Amin Mirza Boroujerdian,
Volume 15, Issue 8 (Transaction A: Civil Engineering 2017)

Pedestrians are among one of the most vulnerable road users. Speed of vehicles is considered as one of the major causes of danger for pedestrians crossing the street (making cross movements). Therefore, it is of utmost importance to devise suitable solutions for reducing speed of vehicles. One of these solutions is installation of Pedestrian Refuge Islands (PRI) in very wide midblocks. With regard to fluctuations in pedestrian and vehicle traffic volume in traffic hours, there are different variations in collisions between vehicle and pedestrian. In this article the effect of constructed PRI in Tehran on speed of vehicles and consequently their effects on probability fluctuations of fatal accidents are determined. Speed of vehicles in two phases of before and after arriving to the PRI is assessed. Additionally, speed of vehicles in non-observed volumes of vehicle and pedestrian are calculated using Aimsun.v6 simulation software. Paired T-test is applied to compare average speed of vehicles before and after the PRI. The results revealed that except for traffic volumes of 3000-4000 veh/h and 400-600 ped/h in other volumes reduction of average speed of vehicles as a result of PRI is significant. Also, the results show that in all volumes, these equipments reduce the probability of fatal accidents to under 10%. According to the results, it is recommended that PRI should be installed in midblocks where traffic volume of vehicles in each lane is less than 750 veh/h.

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