Making Sense of Sensor: An Update from Low-cost Air Quality Sensor for Air Quality Monitoring in Malaysia

Mohd Shahrul Mohd Nadzir,Sawal Hamid Md Ali,Mohd Talib Latif,Soo Wei Khor,Haris Hafizal Abd Hamid,Utbah Rabuan,Zaki Khaslan 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10

Clean air is one of the most fundamental principles of life quality and well-being. Outdoor and indoor air pollutions both can contributes to human health problems. Conventionally, the methodologies adapted to measure indoor air pollutants are based on: (i) passive samplers, which require long sampling periods and/or (ii) continuous sampling, which generally are bulky and expensive, generating noise and vibration, preventing its deployment in many places at the same time, leading to a limited spatiotemporal coverage. In recent years, low-cost air pollution technologies have gained increasing interest and, consequently, have been studied widely by the scientific community for air pollutions monitoring. Thus, it is important that these new sensing technologies provide reliable data, with good precision and accuracy. Electrochemical (EC) sensors from AiRBOXSense were constructed to measure CO, NO₂, and O₃. Results showed that the sensors behaved highly linearly in laboratory experiments and had response times of around 0.5-1.6 min. In this study, a simple equation was used to translate the signal to mixing ratio and was calibrated by adding a correction in order to achieve the minimum difference against the gas standard. We found that with the added corrections such as the new sensitivity and offset to the quation with most of the pollutants were r² = 0.8 (p ˂ 0.01), the difference values between mixing ratio of EC sensor and gas standard became decreased. Furthermore, this equation is deployed together with the other calibration model which constructed using the machine learning to translate signal to mixing ratios in the field experiment. Nevertheless, it should be noted that the representatives of measurements in this result only showed during the conditions of this campaign. Thus, the use of low-cost sensing technology to monitor indoor air pollutions is encouraged, but not waiving the relevance of high quality instruments (mainly reference instruments) as reference.

A Baseline Assessment of Coral Reef in Malacca Straits, Malaysia

Che Din Mohd Safuan,Azizi Ali,Zuraini Zainol,Ahmad Ali,Mohd Fadzil Mohd Akhir,Aidy M. Muslim,Zainudin Bachok 한국해양과학기술원 2018 Ocean science journal Vol.53 No.2

Coral reefs along the Malacca Straits (MS) are poorly developed mainly due to turbidity and sedimentation. This study describes the health status and community structure of the corals in Cape Rachado, West Coast of Peninsular Malaysia (WCPM), utilizing the Coral Video Transect (CVT) technique. All the survey transects were categorized as ‘fair’ coral conditions (27.39 ± 5.41%–48.56 ± 18.96%) with the reef floor mainly covered by corals and sediment. Twelve families of coral comprised of 25 distinct genera were identified. Coral communities were differentiated into four clusters with each being predominated by Galaxea, Diploastrea, Fungia and Pectinia respectively. Among all, Pectinia is the most spectacular genera and dominated the survey area. Along the MS, Favia, Favites and Porites are commonly found while Porites and Pectinia dominated the reefs. Low coral cover and diversity was recorded in MS as compared to the reefs in the South China Sea (SCS). The most prominent results include changes in the dominant coral from Porites to Pectinia while some species such as Acropora were absent from the study area. Based on the presented data, the reef in the study area was predominantly occupied by sediment and the coral communities were formed by a species with a high tolerance to turbidity and sedimentation.

Enhancement of Thermoelectric Properties in Cold Pressed Nickel Doped Bismuth Sulfide Compounds

Fitriani Fitriani,Suhana Mohd Said,Shaifulazuar Rozali,Mohd Faiz Mohd Salleh,Mohd Faizul Mohd Sabri,Duc Long Bui,Tadachika Nakayama,Ovik Raihan,Megat Muhammad Ikhsan Megat Hasnan,Mohamed Bashir Ali Ba 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.6

Nanostructured Ni doped Bi 2 S 3 (Bi 2−x Ni x S 3 , 0 ≤ x ≤ 0.07) is explored as a candidate for telluride free thermoelectric material,through a combination process of mechanical alloying with subsequent consolidation by cold pressing followed with asintering process. The cold pressing method was found to impact the thermoelectric properties in two ways: (1) introductionof the dopant atom in the interstitial sites of the crystal lattice which results in an increase in carrier concentration, and (2)introduction of a porous structure which reduces the thermal conductivity. The electrical resistivity of Bi 2 S 3 was decreasedby adding Ni atoms, which shows a minimum value of 2.35 × 10 −3 Ω m at 300 °C for Bi 1.99 Ni 0.01 S 3 sample. The presenceof porous structures gives a signifi cant eff ect on reduction of thermal conductivity, by a reduction of ~ 59.6% compared toa high density Bi 2 S 3 . The thermal conductivity of Bi 2−x Ni x S 3 ranges from 0.31 to 0.52 W/m K in the temperature range of27 °C (RT) to 300 °C with the lowest κ values of Bi 2 S 3 compared to the previous works. A maximum ZT value of 0.13 at300 °C was achieved for Bi 1.99 Ni 0.01 S 3 sample, which is about 2.6 times higher than (0.05) of Bi 2 S 3 sample. This work showan optimization pathway to improve thermoelectric performance of Bi 2 S 3 through Ni doping and introduction of porosity.

Promotion of Green Economy and Biodiversity Conservation with the Palm Oil Industry

Mohd Ali HASSAN,Yoshihito SHIRAI 한국생물공학회 2017 한국생물공학회 학술대회 Vol.2017 No.4

Extenuating Food Integrity Risk through Supply Chain Integration: The Case of Halal Food

Mohd Helmi Ali,Kim Hua Tan,Kulwant Pawar,Zafir Mohd Makhbul 대한산업공학회 2014 Industrial Engineeering & Management Systems Vol.13 No.2

Effects of food scandals on religious belief, human health and even on causes of death indicate that firms and consumers are vulnerable to integrity risks in the global supply chain. Mitigating the integrity risk and maintaining the credence quality products like halal food is very challenging, if not impossible. Our aim in this research is to show that supply chain integration can mitigate the halal food integrity risk. To illustrate this idea, we have conducted case studies and interviews in seven Malaysian chicken supply chain focal firms. We unpack the halal integrity risks along the supply chain, such as production risk, raw material risk, food security risk, outsourcing practices risk, service risk, and logistics risk. The research argues that supply chain integration, such as internal integration and external integration practices, could minimize the halal integrity risk. The advantages of supply chain integration in mitigating the halal integrity risk are also highlighted in this paper.

Palm Biomass Refinery in Malaysia

Mohd Ali HASSAN,Yoshihito SHIRAI 한국생물공학회 2014 한국생물공학회 학술대회 Vol.2014 No.10

Integrated Algal Engineering for Bioenergy Generation, Effluent Remediation, and Production of High-value Bioactive Compounds

Mohd Azmuddin Abdullah,Ashfaq Ahmad,Syed Muhammad Usman Shah,Sanaa Mahmoud Metwally Shanab,Hamdy Elsayed Ahmed Ali,Mervat Aly Mohamed Abo-State,Mohd Fariduddin Othman 한국생물공학회 2016 Biotechnology and Bioprocess Engineering Vol.21 No.2

Increased demand for energy worldwide has resulted in increasing interest in alternative renewable sources of biofuels. Demand for improved systems of bioenergy generation, environmental remediation, and coproduction of high value bioactive compounds has led to the potential use of algae in biomass utilization. In Malaysia, palm oil industries generate high amount of solid wastes. Palm Oil Mill Effluent (POME) is estimated to be three times of the amount of crude palm oil produced. POME is a heavily polluting wastewater due to its high chemical oxygen demand (COD), high biochemical oxygen demand (BOD), and high contents of minerals such as nitrogen and phosphorus that can cause severe pollution to the environment and water resources. A combination of wastewater treatment and renewable bioenergy co-generation with recovery of high-value biochemicals would benefit the palm oil industry.

A New Symmetric Cascaded Multilevel Inverter Topology Using Single and Double Source Unit

Mohd. Ali, Jagabar Sathik,Kannan, Ramani The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.4

In this paper, a new symmetric multilevel inverter is proposed. A simple structure for the cascaded multilevel inverter topology is also proposed, which produces a high number of levels with the application of few power electronic devices. The symmetric multilevel inverter can generate 2n+1 levels with a reduced number of power switches. The basic unit is composed of a single and double source unit (SDS-unit). The application of this SDS-unit is for reducing the number of power electronic components like insulated gate bipolar transistors, freewheeling diodes, gate driver circuits, dc voltage sources, and blocked voltages by switches. Various new algorithms are recommended to determine the magnitude of dc sources in a cascaded structure. Furthermore, the proposed topology is optimized for different goals. The proposed cascaded structure is compared with other similar topologies. For verifying the performance of the proposed basic symmetric and cascaded structure, results from a computer-based MATLAB/Simulink simulation and from experimental hardware are also discussed.

특수한 요구를 지닌 학생들을 위한 고등교육기관 지원시스템에서의 교수자 지식과 준비도

( Mohd Manishaj Ali ),( Abd Rosadah Majid ),( Mohd Norshidah Salleh ),( A Rogayah Razak ) 대구대학교 특수교육문제연구소 2015 한국특수교육문제연구소 학술대회발표자료집 Vol.2015 No.1

말레이시아의 고등교육에서 특수한 요구를 가진 학생들의 입학이 증가되는 것을 보는 것은 매우 고무적인 일이다. 이러한 현상은 교수자들에게 특수한 요구를 가진 학생들의 요구가 있다는 것을 인식하게 하고 교육하게 하는 수준을 증가시키도록 하며 이를 위해 행정가들을 돕도록 하게 한다. 본 연구는 말레이시아의 고등교육기관에서 특수한 요구가 있는 학생들을 위해 학습지원을 제공해주고자하는 교수자들의 의지를 측정하고자 하였다. 연구대상자 표집은 사회 및 사회과학분야의 학부의 12명의 교수자로 구성하였다. 응답자들은 교수자의 학급에서 특수한 요구를 지닌 학생들을 가르친 경험이 있는 자로 구성하였다. 자료는 응답자들에게 새롭게 개발된 인터뷰형식으로 진행되었으며, 4가지 요소(특수한 요구를 지닌 학생들에 대한 지식, 특수한 요구를 지닌 학생들의 수용도, 지원 서비스 제공여부, 그리고 특수한 요구를 지닌 학생들을 통합적으로 지원하기 위한 교수와 학습 상에서의 도전들)로 구성하여 인터뷰하였다. 자료는 인터뷰한 그대로 전사되었으며, 4개의 연구구성에 따라 분류화하였다. 연구결과, 교수자는 그들의 수업을 듣는 특수한 요구의 학생들을 인식하고 판별하고자 하였다. 또한 수용에 있어 준비도가 세부분으로 분류되어져있음이 나타났는데, 학급에서 특수한 요구의 학생들을 충분히 수용하는 교수자, 수용하지 않는 교수자, 신체적 문제만 가진 학생들을 수용하는 교수자이다. 몇몇의 교수자들은 그들이 특수한 요구들을 가진 학생들을 지원하는데 문제에 직면해있음을 인정했다. 따라서 본 연구의 결론은 학급에서 다양한 학습자들을 관리하는 교수자를 위한 지원과 특수한 요구를 가진 학생들을 위한 지원은 서로 영향을 주는 관계에 있다는 것을 확인하였다.

Perceptions of Moral Intensity and Professional Commitment Towards Intention to Whistleblowing: Empirical Evidence from Malaysian Public Sector Organisations

MOHD ZEAMLEE, Siti Nurain,ALI, Mazurina Mohd,HASNAN, Suhaily Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.6

The study's goal is to look at the factors that influence people's willingness to whistleblow in the Malaysian public sector by applying two elements from the Moral Intensity Theory: the magnitude of consequences and societal consensus with professional commitment as an additional variable. The cross-sectional study used primary data collection through questionnaires adopted from previous studies. The survey questionnaires were distributed to target respondents from 27 ministries in Malaysian public sectors selected based on their grade positions in the departments ranging from Grade 29 and above. The findings revealed that societal consensus and professional commitments significantly impact the intention to whistleblow. The findings imply that closed people's opinions may have certain persuasive elements that influence the act of whistleblowing as a moral and ethical activity, thereby increasing their whistleblowing intention. The results also suggest that when individuals are more committed to their career and organization, they will act ethically and under the professional norm, hence, they will be inclined to whistleblow. On the other hand, the magnitude of consequences suggested an insignificant relationship with the intention to whistleblow. The results could facilitate the government in curbing the whistleblowing issue by defining its root before the implementation of necessary policies.