Mohd Sani Mohamad Hashim
Thumbnail Image
Preferred name
Mohd Sani Mohamad Hashim
Official Name
Mohd Sani , Mohamad Hashim
Alternative Name
Hashim, Mohd Sani Mohamad
Mohamad Hashim, M. S.
Hashim, M. S.M.
Hashim, Sani
Main Affiliation
Scopus Author ID
55638811600
Researcher ID
ABA-7717-2020

Research Output

Filters

12
12
Reset filters

Settings
Now showing 1 - 10 of 12
Thumbnail Image
Publication

Analysis of WiFi Spatio-Temporal Data for Organic Fingerprinting-based Indoor Positioning System

2022-01-01 , Abdul Halim Ismail , Amirah Husna Mohd Hajazi , Muhamad Safwan Muhamad Azmi , Mohd Sani Mohamad Hashim , Mohd Nasir Ayob , Hassrizal Hassan Basri

The mobile robot navigation is the next huge topic after positioning utilizing fingerprinting-based Wireless Positioning System (WPS). Many of recent works does not discuss this topic yet since many open problems in positioning topic are not yet solved, for instance the issues on multi-devices heterogeneity, instability of WiFi signals, granularity problems in grid-based indoor environment and many others. However, we anticipate that both positioning and navigation works must run in parallel so that the succession are guaranteed. This paper describes the analysis of spatio-temporal data of the signal obtained from the WiFi Access Point. Initial results suggest that the difference between transmitter heights have an effect on the spatio-temporal data while the handover of maximum signal strengths is inherent when three WiFi APs are used.

View
Thumbnail Image
Publication

Effect of loading protocol on the mechanical properties of 316L stainless steel

2021-10-25 , Heng S.H. , Azmi M.S.M. , Mohd Afendi Rojan , Mohd Sani Mohamad Hashim , Mohd Nasir Ayob , Abdul Halim Ismail , Muhamad Saifuldin Abdul Manan , Abdullah S.

Two types of loading protocol, i.e., monotonic loading and cyclic loading, were compared to investigate the effect on the mechanical properties of 316L stainless steel. The specimen used is a dog-bone specimen in accordance with ASTM E8 and ASTM E606 standard. For cyclic loading, the multiple-step method is used to obtain the hysteresis loop of the material. A total of 13 strain amplitude conditions had been carried out, ranging from 0.05%-0.65%. The stress-strain curve shows that the cyclic stress-strain curve is higher than the monotonic stress-strain curve due to the cyclic hardening behaviour in the 316L stainless steel. The cyclic hardening behaviour increases the ultimate tensile stress of the material. However, when the material gains its strength through cyclic hardening, the ductility in the material will decrease.

View
Thumbnail Image
Publication

Design and Development of a Service Robot for Wi-Fi RSSI Fingerprint Data Collection

2020-09-18 , Bakri M.Q. , Abdul Halim Ismail , Mohd Sani Mohamad Hashim , Muhamad Safwan Muhamad Azmi , Muhammad Juhairi Aziz Safar , Marhaban M.H.

We have designed a service robot that can be used for Wi-Fi RSSI Fingerprint database construction for indoor positioning system. This work aims to aid and ease the signal fingerprint database construction process which currently conducted manually by carrying the data acquisition tools around the experimental field. The robot architecture design considered the values and constraint in performance, aesthetic, cost, and expandability. Analysis of the robot's mobile specification was made in order to choose the optimum hardware components. The robot has three main sections which are mobile platform, storage compartment, and user interactive screen that is capable to display facial expression and other useful information.

View
Thumbnail Image
Publication

Numerical evaluation of aluminium 6026-T9 fracture toughness

2021-10-25 , Zulkifli A.N. , Muhamad Safwan Muhamad Azmi , Ishak Ibrahim , Mohd Sani Mohamad Hashim , Abdul Halim Ismail , Mohd Nasir Ayob

Fracture is the separation of an object into two or more pieces caused by crack growth under the action of applied stress. There are many different methods for fracture evaluation has been made but still lacks information on properties of Aluminium 6026-T9. Aluminium 6026 is non-toxic since it does not contain Tin (Sn) and features a great corrosion resistance. This study focuses on the mechanical properties and fracture toughness of Aluminium 6026-T9. The material is cut and shaped into dog-bone specimens by referring the ASTM E8 and was eventually undergoing a tensile test to evaluate the mechanical properties. A linear elastic analysis of three different crack characteristics which are single edge crack, double edge crack and center crack were performed in Mode I analysis to evaluate its fracture toughness. The stress intensity factor (SIF) value near the crack tip obtained from the simulation process were then compared with analytical value and had been discussed. The percentage of error found that the numerical and analytical values are closed to each other.

View
Thumbnail Image
Publication

Effect of Sample Sizes in Fingerprinting Database for Wi-Fi System

2021-01-01 , Sa’ahiry A.H.A. , Abdul Halim Ismail , Muhammad Juhairi Aziz Safar , Latifah Munirah Kamarudin , Mohd Sani Mohamad Hashim , Muhamad Safwan Muhamad Azmi , Toyoura M.

Indoor positioning system has been an essential work to substitute the Global Positioning System (GPS). GPS utilizing Global Navigation Satellite Systems (GNSS) cannot provide an accurate positioning in the indoor due to the multipath effect and shadow fading. Fingerprinting method with Wi-Fi technology is a promising system to solve this issue. However, there are several problems with the fingerprinting method. The fingerprinting database collected has different sample sizes where the previous researcher does not indicate any standard for the sample size to be used. In this paper, the effect of the sample sizes in fingerprinting database for Wi-Fi technology has been discussed deeply. The statistical analyzation for different sample sizes has been analyzed. Furthermore, two methods which are K- Nearest Neighbor (KNN) and Deep Neural Network (DNN) are being used to examine the effect of the sample sizes in term of accuracy and distance error. The discussion in this paper will contribute to the better sample size selection depending on the method taken by the user. The result shows that sample sizes are an important metrics in developing the indoor positioning system as it effects the result of the location estimation.

View
Thumbnail Image
Publication

Analysis of WiFi Spatio-Temporal Data for Organic Fingerprinting-based Indoor Positioning System

2022-01-01 , Abdul Halim Ismail , Hajazi A.H.M. , Muhamad Safwan Muhamad Azmi , Mohd Sani Mohamad Hashim , Mohd Nasir Ayob , Hassrizal Hassan Basri

The mobile robot navigation is the next huge topic after positioning utilizing fingerprinting-based Wireless Positioning System (WPS). Many of recent works does not discuss this topic yet since many open problems in positioning topic are not yet solved, for instance the issues on multi-devices heterogeneity, instability of WiFi signals, granularity problems in grid-based indoor environment and many others. However, we anticipate that both positioning and navigation works must run in parallel so that the succession are guaranteed. This paper describes the analysis of spatio-temporal data of the signal obtained from the WiFi Access Point. Initial results suggest that the difference between transmitter heights have an effect on the spatio-temporal data while the handover of maximum signal strengths is inherent when three WiFi APs are used.

View
No Thumbnail Available
Publication

Finite element modelling of Plantar Fascia response during running on different surface types

2017-10-29 , Razak A.H.A. , Khairul Salleh Basaruddin , Ahmad Faizal Salleh , Rusli W.M.R. , Mohd Sani Mohamad Hashim , Ruslizam Daud

Plantar fascia is a ligament found in human foot structure located beneath the skin of human foot that functioning to stabilize longitudinal arch of human foot during standing and normal gait. To perform direct experiment on plantar fascia seems very difficult since the structure located underneath the soft tissue. The aim of this study is to develop a finite element (FE) model of foot with plantar fascia and investigate the effect of the surface hardness on biomechanical response of plantar fascia during running. The plantar fascia model was developed using Solidworks 2015 according to the bone structure of foot model that was obtained from Turbosquid database. Boundary conditions were set out based on the data obtained from experiment of ground reaction force response during running on different surface hardness. The finite element analysis was performed using Ansys 14. The results found that the peak of stress and strain distribution were occur on the insertion of plantar fascia to bone especially on calcaneal area. Plantar fascia became stiffer with increment of Young's modulus value and was able to resist more loads. Strain of plantar fascia was decreased when Young's modulus increased with the same amount of loading.

View
Thumbnail Image
Publication

Investigating and improving Boeing aircraft composite panel industrial painting issues by designing smart robotic precision painting system

2021-10-25 , Mohamad Aniq Syazwan Mohamed Hassan , Shahriman Abu Bakar , Zuradzman Mohamad Razlan , Nur Saifullah Kamarrudin , Mohd Sani Mohamad Hashim , Wan Khairunizam Wan Ahmad , Azizi Harun , Ishak Ibrahim , Mohd Khairul Faizi Abd Rahman , Fadzilla M.A. , Rahman M.F.A. , Hamid N.M.F.N.A. , Manaf A.A. , Rani M.F.H.

Aerospace Composites Malaysia (ACM) Sdn Bhd produces one of the aircraft components, which is an aircraft composite panel. Currently, the painting of the composite aircraft panel is manually conducted by the high skilled human operator. However, there are several issues of manual painting, which are the precision of the thickness specifications, uneven spray, dust-free, microbubble, colour appearance, and contour of the aircraft composite panel. Consequently, these issues contribute to the aircraft aerodynamic performances, productivity, and index time of the aircraft composite panel's production. Thus, the main objectives are to investigate the human painting mimicking robot incorporated with the existing painting environment. The proposed environment becomes smart precision painting systems. In conclusion, the proposed prototype will overcome the quality issue of aircraft composite panel painting faced by Boeing worldwide aircraft industries. Furthermore, the proposed prototype will increase productivity and contribute to the maintaining of the aircraft's aerodynamic performance.

View
Thumbnail Image
Publication

Investigating the thermal characteristic of copper alloys valve seat towards engine performance enhancement of MODENAS CT115 through steady-state analysis

2021-10-25 , Zainol M.A.A. , Mohamad Aniq Syazwan Mohamed Hassan , Shahriman Abu Bakar , Zuradzman Mohamad Razlan , Anas Abdul Rahman , Mohd Sani Mohamad Hashim , Nur Saifullah Kamarrudin , Wan Khairunizam Wan Ahmad , Azizi Harun , Ishak Ibrahim , Mohd Khairul Faizi Abd Rahman , Muhammad Faiz Hilmi Rani

MODENAS CT115 engine is a single overhead camshaft (SOHC) engine, with a rated power of 8.8 horsepower at 9000 rpm. One of the main concerns of engine research is the overheating of engines. Overheating can affects the performance of an engine by leading to a loss of strength and thermal strain. To prevent failure, thermal analysis is used to determine the flow of heat with precision to optimise temperature distribution. The investigation is done using ANSYS Thermal simulation on the CAD model of the engine cylinder head, intake and exhaust valve, and intake and exhaust valve seat insert. The comparison to the existing valve seat insert is made using three different valve seat insert materials: Beryllium-copper C17200, Bronze-copper C61300, and Brass C36000. The research results proved that Brass C36000 provides the best thermal reduction and heat transfer increment compared to the existing valve seat insert material.

View
No Thumbnail Available
Publication

Effect of various bending angles on a passive light pipe for eco-daylighting systems

2017-10-29 , Ng Y. F. , Mohd Sani Mohamad Hashim , Din M.A.Z. , Nasrul Amri Mohd Amin , Nur Saifullah Kamarrudin , Mohd Hafif Basha Mohamad Jamel Basha , Md. Tasyrif bin Abdul Rahman

Daylighting systems is one of alternative to reduce a high energy consumption that caused by artificial lighting. However the use of passive light pipes in daylighting systems with various bending angles may affect the efficiency of light transfer from the sunlight to the room. Thus this paper is proposed to study the effect of various bending angles on a light pipe. Three bending angles of light pipe, which are 0°, 30° and 45°, were analyzed through the experimental works. A test bed room was constructed in order to simulate daylighting in a room. The results were then visualized in graphs based on the efficiency by considering the maximum average internal illuminance achieved by each light pipe. From the results, it shows that when the bending angle increases, the average internal illuminance decreases. And the highest average internal illuminance was achieved by 0° light pipe.

View