Applications of bridge information modeling in bridges life cycle

Mohamed M. Marzouk,Mohamed Hisham,Khalid Al-Gahtani 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.3

The purpose of this paper is to present an Integrated Life Cycle Bridge Information Modeling that can be used throughout different phases of the bridge life cycle including: design, construction, and operation and maintenance phases. Bridge Information Modeling (BrIM) has become an effective tool in bridge engineering and construction. It has been used in obtaining accurate shop drawings, cost estimation, and visualization. In this paper, BrIM is used as an integrated tool for bridges life cycle information modeling. In the design phase, BrIM model can be used in obtaining optimum construction methods andperforming structural advanced analysis. During construction phase, the model selects the appropriate locations for mobile cranes, monitors the status of precast components, and controls documents. Whereas, it acts as a tool for bridge management system in operation and maintenance phase. The paper provides a detailed description for each use of BrIM model in design, construction, and operation and maintenance phases of bridges. It is proven that BrIM is an effective tool for bridge management systems throughout theirlife phases.

Modeling and Control of pH Neutralization Using Neural Network Predictive Controller

Mohamed Gaberalla Mohamed Khai,Suhaila Badarol Hisham 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10

The difficulty of controlling pH neutralization processes resides in the non-linearity of such processes. This behavior is due to the logarithmic relationship between the hydrogen ions concentrations [H+] and the level of pH. The control strategy to be developed very much depends on the feasibility of the mathematical model that represents the process. This paper illustrates feasible modeling of the pH neutralization plant using empirical techniques and investigates the performance of an artificial neural network predictive controller against the more traditional PID controllers. As a conclusion, a feasible empirical model was found closest to a second?rder with dead time. The artificial neural network predictive controller has outperformed the conventional PI / PID controllers.

Does Bilateral Trade Between China and ASEAN Countries Improve Its Firm’s Efficiency?

Mohamed Hisham HANIFA,Sok Gee CHAN,Mohd Edil Abd SUKOR 한국유통과학회 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.2

The Chinese outward foreign direct investment (OFDI) involves various bilateral trade agreements and regional agreements signed between China and other countries. This study examines the impact of Chinese OFDI in ASEAN–5 countries through ASEAN-China Free Trade Agreement (ACFTA) namely Indonesia, Malaysia, Philippines, Singapore, and Thailand from 2000 to 2016. This study attempts to address three research objectives. The first is to examine the motives for China’s investment in ASEAN-5. The second is to explore the different impacts of China’s investment across countries. The third is to investigate whether the OFDI conducted by state-owned enterprises (SOEs) will produce different impacts on the firm’s efficiency score. Using the DEA approach, this study finds evidence that the overall Chinese OFDI is relatively efficient. We find that the estimated efficiency score of this OFDI has improved in pre- and post ACFTA where a higher overall efficiency score was reported when comparing pre- and post ACFTA signing for both SOEs and NSOEs. Finally, China’s parent firms’ efficiencies showed higher scores among NSOEs compared to SOEs after the signing of ACFTA for all ASEAN countries except Malaysia. We highlight that the country’s institutional infrastructure, earlier investment presence, and diplomatic ties help in shaping an effective trade agreement.

Implementing Earned Value Management using Bridge Information Modeling

Mohamed Marzouk,Mohamed Hisham 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.5

Building Information Modeling (BIM) has widely become an effective tool in engineering and construction fields. It could be usedin: generating shop drawings; detecting clashes; estimating quantities; and controlling documents. Applying BIM technology onbridges is named Bridge Information Modeling (BrIM). Bridge Information Modeling (BrIM) is an intelligent representation ofbridges since it contains all information needed about bridges through their whole lifecycle. This paper presents the use of BuildingInformation Modeling in cost and time management of infrastructure bridges. BIM-based cost estimation application is presentedwhich is capable to carry out approximate cost estimate; and detailed cost estimate. The application is designed in a flexible mannerto be used with default values, or user defined values. Different performance measurement indexes are used in order to control thecost and schedule during execution phase of construction projects. This application integrates BIM with Earned Value (EV) conceptto determine the project status at specific reporting date. A case study is presented to demonstrate the use of the developed modules.

Applications of bridge information modeling in bridges life cycle

Marzouk, Mohamed M.,Hisham, Mohamed,Al-Gahtani, Khalid Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.3

The purpose of this paper is to present an Integrated Life Cycle Bridge Information Modeling that can be used throughout different phases of the bridge life cycle including: design, construction, and operation and maintenance phases. Bridge Information Modeling (BrIM) has become an effective tool in bridge engineering and construction. It has been used in obtaining accurate shop drawings, cost estimation, and visualization. In this paper, BrIM is used as an integrated tool for bridges life cycle information modeling. In the design phase, BrIM model can be used in obtaining optimum construction methods and performing structural advanced analysis. During construction phase, the model selects the appropriate locations for mobile cranes, monitors the status of precast components, and controls documents. Whereas, it acts as a tool for bridge management system in operation and maintenance phase. The paper provides a detailed description for each use of BrIM model in design, construction, and operation and maintenance phases of bridges. It is proven that BrIM is an effective tool for bridge management systems throughout their life phases.

What is the effect of initial implant position on the crestal bone level in flap and flapless technique during healing period?

Mohammed Jasim Al-Juboori,Shaifulizan Ab Rahman,Akram Hassan,Ikmal Hisham Bin Ismail,Omar Farouq Tawfiq 대한치주과학회 2013 Journal of Periodontal & Implant Science Vol.43 No.4

Purpose: The level of the implant above the marginal bone and flap design have an effect on the bone resorption during the healing period. The aim of this study is to detect the relationship between the level of the implant at the implant placement and the bone level at the healing period in the mesial and distal side of implants placed with flapless (FL) and full-thickness flap (FT) methods. Methods: Twenty-two nonsubmerged implants were placed with the FL and FT technique. Periapical radiographs were taken of the patient at implant placement, and at 6 and 12 weeks. By using computer software, bone level measurements were taken from the shoulder of the healing cap to the first bone implant contact in the mesial and distal side of the implant surface. Results: At 6 weeks, the correlation between the crestal bone level at the implant placement and crestal bone level of the FT mesially was significant (Pearson correlation coefficient=0.675, P<0.023). At 12 weeks, in the FT mesially, the correlation was nonsignificant (Spearman correlation coefficient=0.297, P<0.346). At 6 weeks in the FT distally, the correlation was nonsignificant (Pearson correlation coefficient=0.512, P<0.107). At 12 weeks in the FT distally, the correlation was significant (Spearman correlation coefficient=0.730, P<0.011). At 6 weeks in the FL mesially, the correlation was nonsignificant (Spearman correlation coefficient=0.083, P<0.809). At 12 weeks in the FL mesially, the correlation was nonsignificant (Spearman correlation coefficient=0.062, P<0.856). At 6 weeks in the FL distally, the correlation was nonsignificant (Spearman correlation coefficient=0.197, P<0.562). At 12 weeks in the FL distally, the correlation was significant (Pearson correlation coefficient=0.692, P<0.018). Conclusions: A larger sample size is recommended to verify the conclusions in this preliminary study. The bone level during the healing period in the FT was more positively correlated with the implant level at implant placement than in the FL.

Fabrication and characterization of polymer-infiltrated ceramic network materials based on nano-tetragonal zirconia

Mohammed Nesreen Y.,Wahsh Mohamed M. S.,Motawea Inas T.,Essawy Hisham A. 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.3

Fabrication and characterization of polymer infiltrated ceramic networks (PICNs) were undertaken for use in dentistry. Calciastabilized tetragonal zirconia (7-tCSZ) nanoparticles were synthesized via a modified co-precipitation. The composition and particle size of the prepared nanoparticles were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). Densification parameters of porous ceramic samples, with varying amounts of 7-tCSZ, 0, 5, 10, and 15 wt.%, and PICN materials were examined using the Archimedes principle. The flexural strength and elastic modulus of PICNs were measured using a three-point bending strength test. The microhardness and fracture toughness were determined using Vickers microhardness and V-notched bars tests, respectively. The microstructure was investigated for selected materials before and after polymer infiltration using scanning electron microscopy (SEM). The results revealed that the samples with 10 and 15 wt.% of nano-tetragonal zirconia showed the highest elastic modulus (8.24 GPa) and fracture toughness (1.82 MPa m 1/2 ), respectively, which is attributed to transformation toughening of zirconia. The flexural strength and microhardness of PICNs were in the range 66.14–71.72 MPa, 0.18–0.19 GPa, respectively, whilst the brittleness index was maximally 0.21 μm −½ , which is significantly below the ultimate brittleness index (4.3 μm −1/2 ) allowing machinability. Conclusively, the inclusion of nanometric zirconia posed a dramatic enhancement of the mechanical properties without affecting the machinability of these biomimetic materials, making them similar to natural dentin in terms of the elastic modulus and fracture toughness along with ease of machinability, which renders them promising as indirect dental restorative materials.

A model to develop the porosity of concrete as important mechanical property

Rayed Alyousef,Hisham Alabduljabbar,Abdeliazim Mustafa Mohamed,Abdulaziz Alaskar,Kittisak Jermsittiparsert,Lanh Si Ho 국제구조공학회 2020 Smart Structures and Systems, An International Jou Vol.26 No.2

This numerical study demonstrates the porosity conditions and the intensity of the interactions with the aggressive agents. It is established that the density as well as the elastic modulus are correlated to ultrasonic velocity The following investigation assessed the effects of cement grade and porosity on tensile strength, flexural and compressive of Ultra High Performance Concrete (UHPC) as a numerical model in PLAXIS 2d Software. Initially, the existing strength-porosity equations were investigated. Furthermore, comparisons of the proposed equations with the existing models suggested the high accuracy of the proposed equations in predicting, cement grade concrete strength. The outcome obtained showed a ductile failure when un-corroded reinforced concrete demonstrates several bending-induced cracks transfer to the steel reinforcement. Moreover, the outcome also showed a brittle failure when wider but fewer transverse cracks occurred under bending loads. Sustained loading as well as initial pre-cracked condition during the corrosion development have shown to have significant impact on the corrosion behavior of concrete properties. Moreover, greater porosity was generally associated with lower compressive, flexural, and tensile strength. Higher cement grade, on the other hand, resulted in lower reduction in concrete strength. This finding highlighted the critical role of cement strength grade in determining the mechanical properties of concrete.

What is the effect of initial implant position on the crestal bone level in flap and flapless technique during healing period?

Al-Juboori, Mohammed Jasim,Ab Rahman, Shaifulizan,Hassan, Akram,Ismail, Ikmal Hisham Bin,Tawfiq, Omar Farouq Korean Academy of Periodontology 2013 Journal of Periodontal & Implant Science Vol.43 No.4

Purpose: The level of the implant above the marginal bone and flap design have an effect on the bone resorption during the healing period. The aim of this study is to detect the relationship between the level of the implant at the implant placement and the bone level at the healing period in the mesial and distal side of implants placed with flapless (FL) and full-thickness flap (FT) methods. Methods: Twenty-two nonsubmerged implants were placed with the FL and FT technique. Periapical radiographs were taken of the patient at implant placement, and at 6 and 12 weeks. By using computer software, bone level measurements were taken from the shoulder of the healing cap to the first bone implant contact in the mesial and distal side of the implant surface. Results: At 6 weeks, the correlation between the crestal bone level at the implant placement and crestal bone level of the FT mesially was significant (Pearson correlation coefficient=0.675, P<0.023). At 12 weeks, in the FT mesially, the correlation was nonsignificant (Spearman correlation coefficient=0.297, P<0.346). At 6 weeks in the FT distally, the correlation was nonsignificant (Pearson correlation coefficient=0.512, P<0.107). At 12 weeks in the FT distally, the correlation was significant (Spearman correlation coefficient=0.730, P<0.011). At 6 weeks in the FL mesially, the correlation was nonsignificant (Spearman correlation coefficient=0.083, P<0.809). At 12 weeks in the FL mesially, the correlation was nonsignificant (Spearman correlation coefficient= 0.062, P<0.856). At 6 weeks in the FL distally, the correlation was nonsignificant (Spearman correlation coefficient=0.197, P<0.562). At 12 weeks in the FL distally, the correlation was significant (Pearson correlation coefficient=0.692, P<0.018). Conclusions: A larger sample size is recommended to verify the conclusions in this preliminary study. The bone level during the healing period in the FT was more positively correlated with the implant level at implant placement than in the FL.

Appropriate Timing of Surgery after Neoadjuvant Chemo-Radiation Therapy for Locally Advanced Rectal Cancer

Garrer, Waheed Yousry,Hossieny, Hisham Abd El Kader El,Gad, Zeiad Samir,Namour, Alfred Elias,Amer, Sameh Mohammed Ahmed Abo Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.9

Background: Surgery is the corner stone for the management of rectal cancer. The purpose of this study was to demonstrate the optimal time of surgical resection after the completion of neoadjuvant chemo-radiotherapy (CRT) in treatment of locally advanced rectal cancer. Materials and Methods: This study compared 2 groups of patients with locally advanced rectal cancer, treated with neoadjuvant CRT followed by surgical resection either 6-8 weeks or 9-14 weeks after the completion of chemo-radiotherapy. The impact of delaying surgery was tested in comparison to early surgical resection after completion of chemo-radiotherapy. Results: The total significant response rate that could result in functional preservation was estimated to be 3.85% in group I and 15.4% in group II. Some 9.62% of our patients had residual malignant cells at one cm surgical margin. All those patients with positive margins at one cm were in group I (19.23%). There was less operative time in group II, but the difference between both groups was statistically insignificant (P=0.845). The difference between both groups regarding operative blood loss and intra operative blood transfusion was significantly less in group II (P=0.044). There was no statistically significant difference between both groups regarding the intra operative complications (P=0.609). The current study showed significantly less post-operative hospital stay period, and less post-operative wound infection in group II (P=0.012 and 0.017). The current study showed more tumor regression and necrosis in group II with a highly significant main effect of time F=61.7 (P<0.001). Pathological TN stage indicated better pathological tumor response in group II (P=0.04). The current study showed recurrence free survival for all cases at 18 months of 84.2%. In group I, survival rate at the same duration was 73.8%, however none of group II cases had local recurrence (censored) (P=0.031). Disease free survival (DFS) during the same duration (18 months) was 69.4 % for patients in group I and 82.3% for group II (P=0.429). Conclusions: Surgical resection delay up to 9-14 weeks after chemo-radiation was associated with better outcome and better recurrence free survival.