bluuebunny/crossref_metadata_2025 huggingface dataset:
Site-specific ground response analysis at a site in the affected area of the 2016 Pidie Jaya earthquake
Authors: Yunita H , Al Huda N , Saidi T , Yuliannur A , Setiawan B , Ramadhansyah P J , Ali M I
Published: January 2020

Analytical models have demonstrated that they are able to simulate reasonably well the seismic motions at the ground level. The most widely used model is the equivalent linear approach. This equivalent linear model was used to compute the free-field response of Meureudu-Pidie Jaya, Aceh Indonesia’s soft soils during the 2016 Pidie Jaya earthquake. The model computes the ground response of horizontally layered soil deposits subjected to transient and vertically propagating shear waves through the one-dimensional soil column. Each soil layer is assumed to be homogeneous, visco-elastic and infinite in the horizontal extent. The equivalent linear estimation of soil properties is taken to express the nonlinearity of the soil’s shear modulus and damping values. These values are assumed to be a function of shear strain amplitude and determined by an iterative process that must be consistent with the level of the effective strain induced in each sub-layer. Starting with the highest shear modulus and a low damping value, the shear modulus and the damping ratio of each sub-layer are modified. The modification is based on the applicable relationship between both properties and the shear strain. The calculation is repeated until strain-compatible modulus and damping values converge within a tolerance of 1%. This research reveals the ground motions of Pidie Jaya’s soils. The results of the analysis are presented.
Selection of Contractor by Using Analytical Hierarchy Process (AHP)
Authors: Razi P Z , Ramli N I , Ali M I , Ramadhansyah P J
Published: January 2020

Construction projects is progressing rapidly in Malaysia and have been as one of an important factor in contributing the boost of country’s economic. Well known as a sectors with involvement of multiple players, thus, contractor selection is an important aspect in construction sector especially for client or parties involve that need to hire the best contractor to manage and complete their project within time-line and bearable cost couple with comprised quality. Furthermore, without a suitable method use in selection of contractor, it will affect the completion of whole project. This paper aiming in make use of the analytical hierarchy process (AHP) as a decision support model to select contractor. The AHP allows constructing decision as hierarchies and each criterion can be evaluated through weighted determined by the expert in construction field. The objectives of this study is to develop the main criteria used by client in selection of contractors also identify the weighted criteria by using AHP method from current practice in Malaysia. Besides, this method is one of the decision-making that is necessary to eliminate the risks of project failure due to poor contractor’s performance.
Selection of Method in Construction Industry by using Analytical Hierarchy Process (AHP)
Authors: Razi P Z , Ramli N I , Ali M I , Ramadhansyah P J
Published: January 2020

Method in construction industry is very important in construction industry. The type of method used in construction may affect the quality of the project. Three distinct method that will be explore in this paper are traditional method, design and build and industrial building system (IBS). The traditional procurement method, known for its separate entity by the client, architect and contractor. The architect will responsible for design work, while contractor will responsible for construction work. Meanwhile, the design and build, whereby the contractor accepts responsibility for some or all of the design finally the IBS is when the construction built using pre-fabricated components. This paper aiming in identifying the criteria and suitability for selecting different kind of construction delivery method in construction by using the multi-criteria decision making (MCDM) namely the Analytical Hierarchy Process (AHP) method. Results provides some empirical finding which contractor for Grade 7 is suitable employing the industrial building system(IBS) method while the traditional method is appropriately for the Grade 1 contractor.
Selection of Best Consultant by using Analytical Hierarchy Process (AHP)
Authors: Razi P Z , Ramli N I , Ali M I , Ramadhansyah P J
Published: January 2020

Consultant selection is a complex problem involving qualitative and quantitative multi criteria decision. In this study, an AHP-based consultant selection model is applied to develop and assist in decision making process to resolve the consultant selection problem in choosing the most favourable consultant’s criteria combination. The Analytic Hierarchy Process (AHP) is an established decision method used to synthesize judgements and select the best alternative. When the objectives and scopes of study are set, then the data collection are made through two methods which are through literature review and pair-wise questionnaire survey. Information obtained from the questionnaire is interpreted into a simpler form and analysed by using the Expert Choice software. Results shows that financial capability of the consultant prioritize the decision of the selection while dominating the sub-criteria for selection is the profit made by the consultant within the last 3 years.
The Neo-Deterministic Seismic Hazard map (NDSHA) of Sumatra compared with official 2010 and 2017 derived from PSHA method
Authors: Irwandi I , Umar M , Khaizal J , Asrurifak M , Usama F , Ridwan M
Published: January 2020

Typical seismic hazard problem lies on determination of ground motion characteristics associated with future earthquakes. Strong ground motion characteristics such as Peak Ground Acceleration (PGA) is important information for engineers in order to provide earthquake resistant building. The Indonesian government has provided update of maps of PGA by released a series official PSHA (Probabilistic Seismic Hazard Assessment) maps in 1978, 2002, 2010 and 2017. On the other hand, the NDSHA (Neo-Deterministic Seismic Hazard Assessment) method has been developed and successfully applied to Sumatra. Because of the availability of numerical PGA data for the official PSHA 2010 and 2017, this paper discusses the comparison of PGA between derived from NDSHA and that of official PSHA updated in 2010 and 2017. The spatial resolution of the PGA digital map of PSHA is 0.01 degree and NDSHA is 0.1 degree. Due to the different resolution, a program and a script are developed to incorporate PSHA data into the NDSHA data points by performing interpolation procedure. The comparison results show the PGA of PSHA 2017 is significantly greater than PGA PSHA 2010. However, the PGA values of the 2017 PSHA map are lower than that of PSHA 2010 such as along the Sumatran fault in Central and South Sumatra. The PGA values estimated by using standard NDSHA with 10 Hz cut-off is higher than those of the computed PGA from PSHA at PE (Probability of Exceeding) of 2% in 50 year for official map released in 2010 and 2017. For comparison with PE of 2% in 50 year, the near field NDSHA gives the PGA value greater than that of the PSHA; and for the far field sources. This means the NDSHA calculation for Sumatra gives reasonable results based on the adopted magnitude distance threshold. This is due to the fact that the standard NDSHA is based on the realistic physical simulation of the seismic wave propagation. The comparison between the PGA computed based on the proposed enhanced version of NDSHA and PSHA shows that the updated version gives the same values at near field and lower values at the far sites; whereas the standard one gives a higher value in NDSHA, which in turn gives a higher PGA value for the near and far field sources.
Influence of Desert Sand and Cooling Regime on the Compressive Strength of High Strength Concrete after High Temperatures
Authors: Zhang M H , Liu H F , Tian S , Ma Y C , Doh S I
Published: January 2020

An experimental investigation is conducted to analyze the influence of desert sand replacement ratio and cooling regime on the compressive strength of desert sand-based high strength concrete (DS-HSC). According to the design of experiment, six desert sand replacement ratios (0%, 20%, 40%, 60%, 80% and 100%) are employed to concrete mixture. DS-HSCs are subjected to two cooling regimes (air cooling and water cooling) and various temperatures (20°C, 400°C, 500°C, 600°C, 700°C and 850°C, respectively) in this paper. The results indicate that the compressive strength of DS-HSC with air cooling is higher than that with water cooling. Moreover, the highest compressive strength appears with the desert sand replacement ratio of 20%. The compressive strength of DS-HSC gradually decreases with the increase of desert sand replacement ratio when the desert sand replacement ratio is more than 20%.
Stability and Resilient Modulus of Porous Asphalt Incorporating Steel Fiber
Authors: Radzi N A M , Masri K A , Ramadhansyah P J , Jasni N E , Arshad A K , Ahmad J , Mashros N , Yaacob H
Published: January 2020

Porous Asphalt (PA) is known as a highly permeable asphalt surface that design to be permeable pavements for stormwater control and reduce the stormwater runoff. However, the structure is subjected to damage from cracking, rutting, stripping, and rapid aging under the effects of repeated vehicle loading, hot climates, and heavy rainfall. To overcome this, PA needs to modify using high tensile strength like steel fiber. Thus, this study aims to evaluate the performance of PA with the addition of steel fiber and overcome the issue that is related to PA. A mixture contains varying percentages of steel fiber were assessed to check which samples gives the best performance as per the requirement by using laboratory tests which are LA Abrasion, Resilient Modulus, Marshall Stability, and Density. The results show that the additions of 0.6% steel fiber give the lowest value of abrasion, while 0.5% fiber content contributes the highest value of Resilient Modulus and Marshall Stability respectively. PA mixtures modified with steel fiber produce the performance enhancement of PA as a road surfacing material. It is concluded that the asphalt mixtures containing steel fibers could increase the stability and strength of the mix.
Incorporation of Risk Index for Risk Response and Risk Mitigation Strategies of Public-Private Partnership (PPP) Housing Construction Project in Malaysia
Authors: Razi P Z , Ali M I , Ramli N I
Published: January 2020

The present work attempt to derive a risk index that causing performance failures among Public-private partnership (PPP) housing construction project, and to propose a risk response and monitoring strategy based on the risk index obtained. A total of thirty-three (33) respondent involved in the PPP housing construction assessing the risk elements employing the Analytical Hierarchy Process (AHP). Findings reveal that among the risks that were captured for high to extreme risks (0.100 < RI ⩽ 0.150) are geologic hazard risk (0.125), and inflation and interest rate risk (0.116) whereas strategy proposed for both of the extreme risks are avoiding the risk and it best to be assigned the risks to the private sector. On contrary, results for moderate risks captured with unreliable value for money (0.066), fluctuation in currency exchange rate (0.058), absence of transparency and accountability during procurement process (0.084), absence of robust and clear agreement (0.077), unforeseen ground condition (0.058) and shortage of technical expertise (0.054) the strategy advocated for the moderate risk is to transfer the risks and shared within both parties i.e. public and private. Eventually, low risks occupied within the risk index of (0.000 < RI ⩽ 0.050) are financial incapacity if private partners (0.034), weak state intervention (0.039), persistent land acquisition (0.039), insufficient capacity in procurement and negotiation (0.035), frequent design change (0.039), design over specification (0.023), poor quality workmanship (0.029), absence of specific PPP framework (0.046) and inadequate PPP skills and knowledge leading to poor planning (0.043) all the risks best to accept and retained within the public sectors. Taken together, the development of risk response and risk mitigation plan that emerged from the risk index offered significant contribution which has gain a new understanding that risks with severe or low exposure can be reduced or avoided taking into account its strategic and effective response and mitigation approaches.
Methodological Study to Classification of Damage State Immediately Subsequent to the Banjarnegara Indonesia Earthquake On 2018
Authors: Bawono A S , Ali M I , Kusumadewi S , Ramli N I
Published: January 2020

This paper presents a preliminary methodological study of a seismic risk assessment in a residential area to classification of damage state immediately subsequent after earthquake happen. This paper compared with difference research of a seismic risk assessment in the same area, i.e. Kertosari, Banjarnegara Indonesia. This methodological study to identified compatibility of the building vulnerability assessment with Naïve Bayes Classifier (NBC) method for determine the probability of damage that has 5 different damage statuses (slight, moderate, extensive, complete and none), where the criteria damage states in vulnerable building has additional damage parameters based on the latest building damage regulations issued in 2013, which have totally 104 data difference criteria. The results from determine the probability of damage processing using the NBC methodology in Kertosari Banjarnegara that most type of damage states is extensive damage. There is a difference with 2018 research data, where the most damage state is the moderate damage, and there is also a difference with the Banjarnegara Municipal Disaster Management Authority (BPBD Banjarnegara) data, which has the most damage state is the complete damage. The difference is caused by the criteria in determining the damage conditions are still too general and the uncertainty value is high. Therefore, it is necessary to improve and detailed the building type model and damaged condition criteria for Indonesian buildings, based on the assessment and suggestion of experts who have good and long experience in earthquake risk management and understand the state of damage to Indonesian building regulations, such as: (1) researchers/scientists; (2) small and medium-sized contractors; (3) construction supervisors; (4) government officials; (5) business leaders; (6) academics/educators; (7) non-governmental organizations, in order to obtain an assessment of damage to residential houses quickly and accurately.
Strength Properties of Porous Concrete Pavement Blended with Nano Black Rice Husk Ash
Authors: Ramadhansyah P J , Masri K A , Mangi S A , Mohd Yusak M I , Hainin M R , Mohd Warid M N , Mashros N , Yaacob H , Mohd Haziman W I
Published: January 2020

In order to improve the porous concrete pavement strength, one of the elements in the porous concrete structure that needs to be considered is the cement paste binder. This study aimed to evaluate the strength properties of porous concrete pavement blended with nanoparticle from black rice husk ash (BRHA). The performance was evaluated based on compressive strength, density, age of curing and strength activity index. Four nano BRHA replacement levels were considered in the study, i.e. 10%, 20%, 30%, and 40% by weight of cement. Test results showed that porous concrete pavement containing 10% nano BRHA replacement levels exhibits excellent compressive strength and strength activity index. The results also indicate that there is no significant correlation between density of the porous concrete pavement and compressive strength.
The effects of bottom ash in coastal sand
Authors: Youventharan D , Rokiah O , Arif S M
Published: January 2020

In the construction industry, breakage of sand particles is very common especially at the very early stage of the pile driving work. The breakage of sand particles will result in change of size spectrum and alter its engineering properties. In this research, the effectiveness of bottom ash in improving the engineering properties of crushed sandy soil was studied. The bottom ash of 5%, 10%, 15% and 20% was added into the sand and crushed with 500 and 1000 blows under the Automatic Compactor machine. The engineering properties of different proportion of bottom ash mixture before crushing and after crushing with 500 and 1000 blows were tested. The engineering properties which were measured include the coefficient of uniformity, breakage index, fouling index, permeability and bearing capacity. Results show that adding of bottom ash into the crushable sand improved the load bearing capacity. By adding 20% of bottom ash, the bearing capacity of the crushed sandy soil can be improved by 55% meanwhile the permeability of the sandy soil can be improved by 200%.
Effect of Dried Sewage Sludge on Compressive Strength of Concrete
Authors: Amminudin A L , Ramadhansyah P J , Doh S I , Mangi S A , Mohd Haziman W I
Published: January 2020

Sewage sludge is a waste product generated from the wastewater treatment process at the treatment plant. The amount of sewage sludge produced is increases every year as the population increased. Poor management of sewage sludge will give negative impact to the environment. Replacing cement with sewage sludge ash is more significant to reduce the amount of waste material from sewage treatment plants. In this study, the various percentage of dried sewage sludge (DSS) has been added to replace the cement. Sewage sludge was dried in the oven with 100°C for 24 hours, then sieve through the sieve size 300 µm. Then, DSS was used in the concrete instead of cement with the replacement percentage of 0%, 5%, 10%, and 15% by weight. The compressive strength of concrete cube specimens was investigated after 7 and 28 days of curing. The results showed that the compressive strength of concrete specimens increased with the replacement of cement in concrete with 5 % to 10 % DSS, but the achieved maximum strength still lower compared to the control sample. However, the compressive strength of concrete specimens decreased when the DSS replacement of cement is more than 10 % by weight. The result of XRF test also showed that DSS has good potential to replace cement in concrete.
Strength of Concrete Containing Synthetic Wire Waste as Fiber Materials
Authors: Khalid F S , Saaidin S H , Shahidan S , Othman N H , Guntor N A A
Published: January 2020

The demand of concrete in construction field is growing as linear with the growing of Malaysia economy. This tendency is expected to continue in the year ahead because of improvement in technology. This study tends to determine the performance of concrete containing synthetic wire waste as fiber materials. In addition, the use of wire waste as fiber materials can reduce the amount of waste dumped into landfills. The increasing amount of wire waste which is uncontrollable may lead to environment issue. Until today there is no researchers have done the studies on performance of concrete containing synthetic wire waste as fiber materials. Therefore, an action is made to overcome the environmental problems by using wire waste as fiber materials in concrete mixture. The amount of wire waste added into concrete mixture are limited to 0%, 0.5%, 1.0%, and 1.5% respectively. Other than that, water cement ratio that used is 0.55. The test that involve in this study is workability, density, compressive strength and tensile strength tests. The compressive strength test carried at the ages of 7 and 28 days and for tensile strength test were carried at ages of 28 days. The result was compared with control mix and the optimum percentage value of using wire waste as fiber materials in concrete was 0.5% for both compressive and tensile strength test. Concrete contains 0.5% of wire waste. These mix shows significant increases about 24.4% and 42.7% increases for compressive and tensile strength respectively, compared to the normal concrete.
Effect of Lightweight Aggregates on early-age behavior of High Performance Concrete
Authors: Higazey M , Shannag M J , Alaskar A
Published: January 2020

Laboratory experiments were conducted to investigate the effects of locally available natural lightweight aggregates (LWA’s) on volume changes and mechanical properties of highperformance concrete (HPC). The normal aggregates fraction of high-performance concrete was replaced with fine and coarse LWA’s at three different replacement levels, 5%, 10% and 20% by volume. The test results indicated a significant reduction in the autogenous shrinkage of highperformance concrete at 56 days without a corresponding considerable reduction in compressive strength of the same concretes. The test results have also shown that up to 20% volume fraction of coarse LWA’s could be used for mitigating the volume changes of HPC with a slight reduction in compressive and splitting tensile strengths, and elastic modulus. Therefore, this investigation recommends the use of locally available natural LWA’s as a viable curing technique for minimizing the volume changes and risk of cracking of HPC’s without compromising their mechanical properties.
Influence of varying density on the mechanical and physical properties of Medium Density Fibreboard (MDF) containing kenaf
Authors: Ismail Noorli , Mohmed Jomali Muhammad Azzim , Abu Bakar Hasniza , Yean Ghing Tong , Zaini Nik Soh Nik Mohd , Aimi Mohd Azam Raden Maizatul
Published: January 2020

Generally, Medium Density Fibreboard (MDF) is made from rubberwood, wood fiber and pine wood with combination of non-woody plant and agricultural residues in producing furniture and laminated floor. The usage of kenaf as main production of MDF had attracted attentions from researchers due to its anatomy of physicals and high content of organic compound namely are cellulose, hemicellulose and lignin. Due to these advantages, kenaf showed the huge potential in producing MDF with the bigger scale of production. In present study, nine (9) panel boards of MDF with sizes of 350 (length) x 350 (width) x 12 (thickness) in millimetres were fabricated based on three (3) different target densities started from 0.7 g/cm3 to 0.8 g/cm3. A total of three (3) samples for each target density were prepared for the measurements. The proportion of 65:15 which was described as ratio of kenaf particles to urea formaldehyde (UF) were selected and measured from the total volume of panel board. Testing of Modulus of Rupture (MOR), Modulus of Elasticity (MOE), Internal Bonding (IB) and Thickness Swelling (TS) were conducted in the present study. All measurements were carried out according to the BS EN 310:1993, BS EN 319:1993 and BS EN 317:1993. Results showed the increment of MOR, MOE and decrement of IB and TS were associated with increment of target density. Thus, target density of 0.8 g/cm3 for MDF is the best selection due to high MOR and MOE and low IB and TS corresponding to other two (2) target densities. The decrement of panel thickness also capable to achieve high density associated with high MOR and MOE. Therefore, the significant outcome shows the kenaf plant have the potential as alternative material to produce the Medium Density Fibreboard (MDF).
Mechanical Properties of Single Shear Plane of Bolted Steel Connection
Authors: Kamarudin A F , Musa M K , Mokhatar S N , Tuan Chik T N , Mohd Zuki S S , Abu Bakar A , Hadipramana J , Ahmad Johari H H
Published: January 2020

A 5-storey portable steel tower based on prefabricated frame concept has been built in Jamilus Research Centre, UTHM. It is now undergoing laboratory testing for static and dynamic performance. In this study, the mechanical properties of the connections were investigated via their connection condition between elements (beam and column) and connectors. The frame elements were designed based on S275 steel grade of 77 mm x 77 mm hollow section with 3 mm thickness, and 8 mm thickness of connectors’ plate. The connection was subjected to single shear plane action which fastened by bolts. Mild steel (grade 4.6) and high tension (grade 8.8) bolts with 10 mm diameter size were used. Shear, bearing and tensile strengths of the bolts and steel plates were determined via tension testing using 50 tonnes of Universal Testing Machine (UTM). From the results, all bolts and steel plates have satisfied the design strengths requirement of 640 N/mm2 (high tension bolt), 240 N/mm2 (mild steel bolt) and 275 N/mm2 as required by EN 1993-1-8. Meanwhile the ultimate shear force of bolts was found within ranges of 25% (high tension) and 12.5% (mild steel) from their respective ultimate tensile force. Bearing failure was occurred at bolt hole of 3 mm thickness of steel plate but only when it was fastened to high tension bolt. No bearing failure occurred when mild steel bolt was used. It has proven that all bolt spacing and edges distances were sufficient, without tearing failure observed in all testing. Finally, the permissible bearing resistance were checked based on the ratio of experiment against the EN 1993-1-8 relationships, when it has shown to satisfaction if the value is less than 1 as recommended by previous researcher.
Vibration Test on Existing Steel Sheet Pile
Authors: Abdul Kudus Sakhiah , Sugiura Kunitomo , Suzuki Yasuo
Published: January 2020

A thorough understanding about the vibration of a structure is essential to resolve any vibration problems. In this study, the vibration measurement was conducted on a real plate structure, which is steel sheet pile. The monitored structures are located in Rokkenya-gawa river and Aji-gawa river in Osaka City, Japan. The purpose of this investigation is to obtain information about the overview conditions of this marine structure. A simple vibration measurement as well as thickness measurement have been conducted. There is no serious damage was observed on the monitored structure.
Preliminary Study on Modified Foamed Concrete-Filled Hollow Section under Cyclic Load
Authors: Azra Khairuddin Siti Amirah , Abd Rahman Norashidah , Luqman Rossam Mohd , Nazirah Mustafa Anis
Published: January 2020

The use of green materials has become a hot topic for discussion in steel construction. Foamed concrete is a green and lightweight material used in concrete mix. The use of foamed concrete as a fill in steel construction has been discussed by many researchers. However, the performance of foamed concrete under cyclic load has not been evaluated. Therefore, this study employed a modified foamed concrete-filled hollow section under cyclic load to determine the performance of concrete-filled hollow section under cyclic load. The modified foamed concrete consists of foamed concrete added with rice hush ash and fibre. Different types of fibres (steel and polypropylene fibres) were utilised. Results showed that the concrete-filled hollow section with steel fibre slightly improved the strength and ductility of the hollow section.
The influence of the stakeholders’ perspective for the performance measurement in local authorities
Authors: Rahmat N , Nawawi A H
Published: January 2020

This research constructs a performance evaluation of the influence of stakeholders’ perspective on the performance measurement in the local authorities. The stakeholders’ perspective has been proven as one of the main factors that influence higher rating on the performance measurement in many public organizations including the local authorities. However, very little attention has been paid towards the attributes of the stakeholders’ perspective that affecting the performance measurement in the local authorities. This research focused on the elements that contribute on the stakeholders’ perspective from the Balanced Scorecard’s perspective and Multi-Criteria Decision Making tool namely Analytic Network Process (ANP) to acquire the priorities of the attributes for the stakeholders’ perspective. The attributes were used as the performance indicator for performance measurement in the local authorities. There were eight (8) attributes that have been measured in order to acquire the priorities of the attributes in affecting the performance measurement under the stakeholders’ perspective (customer, customer retention, new customer acquisition, customer profitability, community support, employees, management and service providers). From this result, it will provide the management of the local authorities to improve the performance of the local authorities which are meaningful for managerial and improvement purpose in the service delivery towards the public.
Examining Risk as Guideline in Design Stage for Green Retrofits Projects: A Review
Authors: Lee M S N , Masrom M A N , Mohamed S , Goh KC , Sarpin N , Manap N
Published: January 2020

Green buildings have generally been adopted as strategy towards sustainable development to reduce greenhouse gas. The implementation of green concept recently has widely spread over the year. However, the positive impact to the environment is still low due to heavily focus on new construction project as compare with retrofitting the existing building. A retrofit practice is not only regaining overall existing building appearance, but the improvement towards energy efficiency is remarkably significant at the expense of huge challenges and risk. As a consequence, retrofit practitioner is confronting an assortment of risks at the early stage of the project. Given that, green retrofit concept is emerging research area to Malaysia construction industry which motivates to determining the risk involve in design stage. This paper aims to review risk in design stage for green retrofit project for commercial buildings through gathering comprehensive literature review. As a result, two main category risks in design stage (technical/quality risk and financial management risk) is determined and extracted to identify risk. These risks are then quantified through analysis to enhance design performance within cost- benefit. The proposed conceptual framework model is expected to assist retrofit practitioner to identify risk and obtain feasible retrofit strategy.
Designer’s Confidence and Attitude towards Designing-for-Construction-Safety (DfCS) Implementation
Authors: Abas N H , Abd Rahman R , Mohammad H , Rahmat M H
Published: January 2020

The construction industry is known as a hazardous industry, which has been overwhelmed with accidents for a long time. One of the new strategies to reduce the number of accident in Malaysia is through emphasizing the safety responsibility on the parties involved during the design stage. This study investigated the confidence level of designing-for- construction-safety (DfCS) and the perceptions of the hindrance by focusing on the role of designers and its implementation among construction designers. The quantitative approach had been used, in which questionnaire survey forms were distributed via email and self-administered to forty (40) construction designers (i.e. civil and construction engineer, quantity surveyor, architect) in Johor. The findings have revealed that the respondents are confident of their ability to design for construction safety, though they are relatively less willing to implement the concept. This study demonstrates that significant effort is required to promote the benefits of DfCS in improving the safety performance of the construction industry so that it is widely accepted and implemented by the construction stakeholders.
Development of Software for Computing of Aircraft’s Takeoff and Landing Characteristics Using Expert System Technology
Authors: Melnichuk A V , Nesterov V A , Sudakov V A
Published: January 2020

The principles of expert system are proposed in the development of software application for calculations of rational takeoff and landing characteristics. The modular architecture is developed for the process of takeoff and landing parameters calculations in the system. A prototype of a client-server software application for electronic flight bag based on tablet computer was developed on the example of a specific type of Russian aircraft.

A post-publication change was made to this article on 21 February 2020 to correct an author name.
Design of Cylindrical Metal Panels with Mild Camber Based on Post-Buckling State when Compressed Taking into Account Initial Deflection
Authors: Mitrofanov O V
Published: January 2020

Applied design method for cylindrical metal panels with mild camber with possible post-buckling state when compressed is suggested. Method is based on analytical solution of geometrically non-linear task and is reduced to non-linear equation solution in panel thickness when reaching critical stress with post-buckling behaviour.
Engineering Software for a Mobile Robot Motion Control System
Authors: Ryadchikov Igor , Nikulchev Evgeny , Gusev Alexander , Sechenev Semyon , Prutskiy Alexey
Published: January 2020

The paper centres round the problem of the engineering a motion control system for a mobile robot based on the effective selection of software components with respect to the numerical criterion proposed by the authors. The data for the selection process comes out the reproducible experiments with the sets of alternative components in a Gazebo virtual infrastructure simulating the real robot operating conditions. The genetic algorithm is used to reduce the number of experiments with unpromising sets of software components. The methodology proposed by the authors is applied to the real task of engineering a motion control system for a non-anthropomorphic mobile robot. The virtual infrastructure and genetic algorithm parameters are provided as well as the physical model of the robot for that task. To calculate the integral quality criterion proposed in the paper, 4 partial quality criteria were measured in the experiments with different software components. The motion process of the physical robot with the selected software components is shown.
Development of microwave processed Ni + 20% SiC based composite clads on AISI-304 steel
Authors: Kaushal Sarbjeet , Gupta Dheeraj , Bhowmick Hiralal
Published: January 2020

In the present investigation microwave hybrid heating technique was used to develop the Ni + 20% SiC based composite clads on AISI-304 substrate. The pilot experiments were carried out inside a domestic microwave oven working at 900W and 2.45GHz. The composite clads were successfully formed within 360 s of microwave exposure time. The so developed microwave processed clads were characterized through relevant techniques like XRD, SEM, EDS and Vicker’s microhardness measurement. The XRD study reveals the presence of various carbides and silicides in the composite clad region. Microstructure study results reveal the presence of hard carbide particles in the soft Ni matrix phases. The average value of microhardness in the clad region was observed as 763 ± 24HV, which was approximately 3 times that of the substrate microhardness.
Thermal design and analysis of payload cabin of solar UAV in near space
Authors: Li X , Lu F , Peng F H , Fu W C , Meng F K , Man G L
Published: January 2020

Aiming at the temperature control demand of the near space solar unmanned aerial vehicle (UAV) payload cabin, this paper establishes the thermodynamic model of the payload cabin through thermal characteristic analysis, and proposes a system design method of structural thermal control integration. The thermal design of the payload cabin is carried out by means of thermal control such as uniform temperature, heat insulation, coating and active temperature control. The design weight of the whole payload cabin is only 7kg. The results of thermal analysis show that the temperature of the equipment in the cabin meets the requirement of the target during the whole UAV mission period, which verifies the correctness of the thermal design method. Compared with the traditional active temperature control scheme, the low temperature level increases by 3°C under the same heating power. The heat dissipation of the payload cabin is mainly convective heat transfer, but with the increase of altitude, the proportion of radiation heat dissipation is gradually increased. The research results can provide reference for the thermal design of similar aircraft.
A fast mesh deformation method for fluid–structure interaction problems
Authors: Jendoubi A.
Published: January 2020

Previous work by the author [1] has developed a very simple moving mesh method, called parabolic extension, allowing for very large deformation in static problems and to very large time steps for time-dependent problems. In this paper, we significantly accelerate the previous method by using a forward Euler scheme with a lumped mass matrix to solve the parabolic extension and we applied it for simulation in fluid-structure interaction. The use of a lumped mass matrix in the forward scheme leads to an explicit algorithm (no linear system to solve) which make the new technique presented here very fast and less computational cost. Numerical benchmarks including complex boundary with irregular deformation are carried out. The results demonstrate that the new method generates the deformed mesh very fast and with high quality even in large deformations, especially concerning the boundary meshes.
Modelling research on oxidation of CH4 & C7H16 from small to large scale of temperature at high pressures
Authors: Cui Xuejian
Published: January 2020

The change of CH4 oxidation cause by adding C7H16 from small to large scale of temperature at high pressures were precisely examined under laboratory condition with the temperatures span from 400K to 1200K and the pressures are regulated at 1atm and 10atm at a reaction container with the equivalence ratio of 0.5. The C7H16 proportion in the CH4/C7H16 mixed substances was varies from zero to one hundred percent. The molar ratios for CH4, C7H16, O2, CO, CO2, formaldehyde, ethene were investigated during several trial runs, and the mechanism is selected to establish the research results over the identical terms with the ideally stirred reaction simulation. It is revealed by the resultant that initial T for the oxidation of CH4 becomes smaller as the C7H16 proportion from the mixed substances increases, and a minor portion of C7H16 leads to a significant shift of the oxidation of CH4 from high to low temperature. The result also reflects that under the higher pressure, the CH4 oxidation is significantly promoted, and the oxidation of CH4 appears to have two reaction intervals which have different speed of reaction. According to the reaction pathway analysis at 100 atm, in lower temperature, the CH4 oxidation is enhanced by adding C7H16.
Applying data mining techniques with data of campus card system
Authors: Li Yufan , Zhang Huifu , Liu Shangli
Published: January 2020

In recent years, campus card system (CCS) has been widely used in universities. At the same time, the scale of the data stored in the database of the CCS is also increasing rapidly. Therefore, it would be better to adopt data mining techniques to reveal the status, causes and trends of students’ consumption data. In this research, the K-Means clustering algorithm is applied to the students’ consumption behavior. The Apriori algorithm is used to study the students’ consumption behavior and performance. The results not only improve the efficiency of student work but also help to build smart campus for our university.
A new method for detecting communities in network based on the affinity between nodes
Authors: Zeng Jin , Shao Chenxi , Wang Xingfu , Miao Fuyou
Published: January 2020

It has been found that many networks display community structure, analysis of the com-munity structure in the network is meaningful for understanding the real-world network. Recently, many community discovery methods have been proposed, most of which are based on the assumption that nodes in the network can only belong to a community at most. The proposed method in the paper is based on the affinity between nodes and it does not agree with the assumption, i.e., the method is able to discover overlapping community structures in networks. We apply the method to various real-world networks and artificial networks, the experimental results confirm that it has better performance on networks with overlapping community structures and non-overlapping community structures.
Mobility-assisted adaptive routing for intermittently connected FANETs
Authors: Li Xianfeng , Deng Fan , Yan Jiaojiao
Published: January 2020

Flying Ad Hoc Network (FANET), a self-configuring network consisting of Unmanned Aerial Vehicles (UAVs), can undertake different kinds of civilian and military tasks. As a particular instance of FANETs, intermittently connected FANETs (IC-FANETs) are characterized by a highly dynamic network topology and intermittent connectivity. Existing routing algorithms have been proposed for FANETs given that the underlying network is well connected, which are not suitable for such network environments. In this paper, we present a geographic routing algorithm called mobility-assisted adaptive routing (MAAR) targeting IC-FANETs. Different from conventional geographic routing protocols exploiting other location services to obtain the location information, MAAR combines routing strategy with location service in order to reduce the packet latency and routing overhead. MAAR updates the information of neighbour nodes dynamically according to nodal mobility and introduces a new metric called IDM to update the positions of other nodes in the network adaptively. In addition, we use a store-carry-and-forward paradigm to handle the technical issues of networks suffering from communication interruptions. When the forwarder node does not have any solution to find an appropriate relay node, mobility is exploited. Simulation results demonstrate that the MAAR scheme performs remarkably in terms of packet delivery ratio, throughput and routing overhead.
LEO IoT based big data management and analysis platform design for intermodal containers
Authors: Lyu Jieyin , Zhou Shouqin , Liu Hao , Zhao Xiangmo
Published: January 2020

In view of the global information management requirements of intermodal containers, combined with the development status, this paper proposes an IoT model based on LEO satellites, and a big data management and analysis platform based on the model. This paper designs and analyses the scheme of the platform, and proposes a middleware approach to solve the problem of multi-source heterogeneous data access of containers intelligent terminals. Then, this paper designs business processes such as user and device registration, middleware registration, historical data access, and timely data access for the platform. The big data analysis and management platform has been prototyped and verified; the platform has the advantages of compatibility, openness and convenience. This study has certain value.
REDT: Remote exploitation detection technology for network infrastructure
Authors: Yin Xiaokang , Liu Shengli , Jia Fangfang , Xiao Da
Published: January 2020

An attacker exploits a remote vulnerability to execute arbitrary code on network infrastructure. It seriously threatens the security of network infrastructure. To detect the exploitation attack in a timely and effective way, in this paper, we present REDT, a remote exploitation detection technology based on the effect of exploitation attack. This method determines whether there is an authentication bypass exploitation by detecting the remote authentication process and saves attack traffic to the anomalous traffic database. With the database, we can replay the attack and analyze the exploitation. In the experiment, the detection accuracy rate reached 97.67%. In addition, this method does not rely on the signatures of the vulnerability and shellcode, so it can detect undisclosed vulnerabilities exploitation and provide abnormal traffic for the study of unknown vulnerabilities.
Design of a relief materials delivery system based on UAV
Authors: Wenjian Zhu , Sidong Zhong , RongJie Chen , Jingchang Xie , Yeqian Li , Huiru Cao
Published: January 2020

The quality and efficiency of traditional rescue work are seriously affected by the destruction of roads and road traffic. In view of these existing problems, the current work investigates the delivery of relief materials using an unmanned aerial vehicle (UAV). At present, studies investigating the delivery of emergency relief materials are few, the technology is not mature, the disadvantage is bigger. In this paper, the UAV material delivery system can realize the function of automatic navigation and automatic delivery of materials. The experimental results show that, in a large number of delivery tests, 97% of deliveries contained a delivery error within 4 m, 64% of deliveries contained a delivery error within 2 m. The average delivery error was 1.86 m. The results of the experiment show that the accuracy of the UAV material delivery system is high, and the test results can provide reference for the further study of the robot.
Research on airline operational risk management and control method
Authors: Qiu Shidai , Yao Dengkai , Wang Zekun , Zhao Guhao
Published: January 2020

Starting from the reality of airlines, this paper studies the operational risk and control methods of airlines, establishes relevant risk index system, and formulates corresponding control methods. Based on the four aspects of human, aircraft, environment and management, the risk index system is established. The weight of the index and the score of each system are determined by using the analytic hierarchy process and the fuzzy comprehensive evaluation respectively, and the airline risk evaluation model is established. In the formulation of airline management and control methods, genetic algorithm is used to compare different flight task combinations, and the advantages of this method are obtained.
Research on flutter reliability of nonlinear binary-wing
Authors: Li Jing Kui , Qi Yi Rui , Cheng Yun Kai
Published: January 2020

In this paper, the aeroelastic analysis of the nonlinear binary wing model under unsteady aerodynamic conditions, the critical flutter speed was calculated by using the v-g method. Based on the critical flutter speed, the implicit limit state function of the nonlinear flutter reliability of the wing was obtained, and the response surface method was used for function fitting. The flutter reliability index was calculated by the checking point method, the design checking point and failure probability were obtained, and the flutter reliability sensitivity was analyzed. Finally, through the analysis of an example, it was proved that this method is feasible.
Investigation of flow characteristics of coronary slot stents using computational fluid dynamics
Authors: Wang Xuan Zhi , Masood Syed H. , Riza Syed H. , Modi Harsh
Published: January 2020

Coronary stents are metallic tubes inserted in coronary arteries to treat cardiovascular diseases. Palmaz-Schatz® Stent represents the original design from which many other slot-stent designs have been derived. In this paper, the impact of the geometry of the stent on its flow characteristics was investigated using the computational fluid dynamics (CFD) analysis. Seven design cases were selected for our research investigation, which were divided into three groups: (a) varying the slot length; (b) varying the slot width; and (c) varying the number of slots. Flow characteristics of stents with various geometries were studied by the CFD analysis using ANSYS CFX software. Results of the analysis revealed significant potential relationships between the geometry of the stent and its flow characteristics.