Gateways Lifelong Learning in TVET for a Viable Future of Bangladesh

Raihan, Abu,Han, Seung Lock 한국방송통신대학교 미래원격교육연구원 2011 평생학습사회 Vol.7 No.2

Procurement, production and proper utilization of ‘high-tech’ is a major concern for the developing country like Bangladesh. Till now there have no learning center which can provide the continuing technical awareness and precaution among the community in Bangladesh. Most of the consumers and the stakeholders of the country are working every moment with modern amenities without academic ‘know-how’. Thus, the article focuses on Lifelong Learning fasten with TVET perspective. It promotes the view that TVET canister to play a central role within any learning initiatives. The objective of the article is therefore to present the claim that Lifelong Learning Centers must have the relation with TVET framework to enable an effective interaction among the communities. The literature-based methodology used to prepare this article for analysis the main issues covered. The idea that the article generated is not the country specific. Moreover, it will helpful as it needs for some other countries where TVET involved uttering the newness of technical inventions in the scientific society. 하이테크의 개발과 활용은 방글라데시와 같은 개발도상국가들이 갖는 주요 관심사의 하나이다. 이들 개발도상국가들은 하이테크기술에 대하여 지속적으로 인식하고 대비하도록 하는 학습센터와 같은 기구를 아직 갖추지 못하고 있다. 이들 국가들에서 대부분의 소비자들은 이들 현대적 하이테크 성과물들을 어떤 과학적 지식이 없이 단지 편의에 따라 사용하고 있을 뿐이다. 이 논문은 이와 같은 하이테크 기술 에 대한 직업기술교육 및 훈련(TVET)에 관계된 평생학습에 초점을 두었다. 이 논문은 직업기술교육 및 훈련에 관한 교육프로그램을 추진하는데 있어서 중심적 역할을 수행할 수 있는 어떤 장치를 제안하고자 하였다. 따라서 이 연구는 평생학습센터가 수강생들과 개발자들, 교수자 및 정보제공자들과 효과적으로 상호작용할 수 있도록 직업기술교육과 연계되어야 한다는 것을 제안하는 데에 목적을 두었다. 이 연구는 문헌분석을 통하여 관련 문제들을 검토하였다. 분석된 문제들은 방글라데시에서 디지털 정보의 확산으로 야기되는 문제들과 이에 대처하기 위하여 직업기술교육 및 훈련을 수행하기 위한 지역자원센터가 지속적으로 요구된다는 것을 제안하였다. 이 연구는 평생학습의 효율성은 끊임없이 변화하고 있는 지식과 정보에 대처할 수 있는 학습자의 능력에 달려있다고 주장하였다. 이 연구에서 제기한 아이디어는 어느 특정지역에만 해당되는 것이 아니라 새로운 과학적 진보를 위해서 직업기술교육을 필요로 하는 어느 지역에서도 도움이 될 것이다. 이 논문은 국가적 기준에 합당한 평생학습이 다양한 분야의 과학적 정보원을 가진 학습자들의 적극적 참여를 필요로 하는 직업기술교육 분야에서의 교육의 중심이 되어야 한다는 것을 제안하였다. 그렇기 때문에 이 논문은 평생교육에 관한 정책과 규정의 개발 분야와도 관련 된다.

Comparative Analysis of Three-Phase AC-DC Converters Using HIL-Simulation

Raihan, Siti Rohani Sheikh,Rahim, Nasrudin Abd. The Korean Institute of Power Electronics 2013 JOURNAL OF POWER ELECTRONICS Vol.13 No.1

This paper presents a comparative evaluation of various topologies for three-phase power converters using the hardware-in-the-loop (HIL) simulation technique. Various switch-mode AC-DC power converters are studied, and their performance with respect to total harmonic distortion (THD), efficiency, power factor and losses are analyzed. The HIL-simulation is implemented in an Altera Cyclone II DE2 Field Programmable Gate Array (FPGA) Board and in the Matlab/Simulink environment. A comparison of the simulation and HIL-simulation results is also provided.

A Comparison of Physical and Machine Learning Model on Solar Irradiance Estimation under All-Sky Conditions

Raihan Kamil(라이한 카밀),Pranda Mulya Putra(프란다 멀리야 푸트라),Hyunjin Lee(이현진) 한국태양에너지학회 2020 한국태양에너지학회 학술대회논문집 Vol.2020 No.10

Mechanical Properties and Microstructural Behaviour of Microwave Sintered WC–Co

Raihan Rumman,Lee C. Chuan,Jamie S. Quinton,Reza Ghomashchi 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.6

Cemented carbides have been of great interest within industrially manufacturable hard materials for their mechanical properties. Microwave sintering is known for its application on a range of hard materials. Although it has been widely used, its effecton grain growth of materials still requires clear understanding. Three different types of particle size, ranging from 1–3 μmto 100 nm were used for microwave sintering where temperature was used in this study within the range of 1000–1400 °C,while pressure during initial compaction of powder particles was kept constant. The maximum hardness was observedin the order of nearly 1800 Hv for submicron samples, sintered at 1250 °C. Fracture toughness on the samples reached amaximum of 16 MPa √m for micron samples sintered at 1400 °C. Grain growth in all samples was not more than 1–3 μm,even without the presence of any commercial grain growth inhibitors as part of the composition. Line scanning betweengrains demonstrates the presence of homogenous Co, confirming good mechanical behaviour. The microstructural featuresassociated to the sintering process have also been focused as part of the study, highlighting some challenges in the research.

Road dust and its effect on human health: a literature review

Raihan K. Khan,Mark A. Strand 한국역학회 2018 Epidemiology and Health Vol.40 No.-

The purpose of this study was to determine the effects of road dust on human health. A PubMed search was used to extract references that included the words “road dust” and “health” or “fugitive dust” and “health” in the title or abstract. A total of 46 references were extracted and selected for review after the primary screening of 949 articles. The respiratory system was found to be the most affected system in the human body. Lead, platinum-group elements (platinum, rhodium, and bohrium), aluminum, zinc, vanadium, and polycyclic aromatic hydrocarbons were the components of road dust that were most frequently referenced in the articles reviewed. Road dust was found to have harmful effects on the human body, especially on the respiratory system. To determine the complex mechanism of action of various components of road dust on the human body and the results thereof, the authors recommend a further meta-analysis and extensive risk-assessment research into the health impacts of dust exposure.

Antioxidant and anticancer effect of methanolic extract of Aerva lanata Linn. against Ehrlich Ascites Carcinoma (EAC) in vivo

Raihan, Obayed,Brishti, Afrina,Bahar, Entaz,Islam, Forhadul,Rahman, Mominur,Tareq, Syed Mohammed,Hossain, Md. Aslam 경희한의학연구센터 2012 Oriental Pharmacy and Experimental Medicine Vol.12 No.3

The present study was conducted to demonstrate the antioxidant and anticancer effects of methanol extract of the aerial parts of Aerva lanata Linn. In vitro antioxidant potentiality was tested using DPPH radical scavenging test, total phenol and flavonoid content and reducing power determination assays. The extracts showed moderate antioxidant activity in a dose dependentmanner. In vivo anticancer activity was studied against Ehrlich Ascites Carcinoma (EAC) cells in Swiss albino mice by monitoring parameters like tumor weight measurement, survival time and tumor cell growth inhibition. It has been found that the compound at the dose of 40 mg/kg/day (i.p) significantly decreases tumor weight, increases life span and reduces tumor cell growth rate in comparison to those of EAC bearing mice receiving no extract. These results suggest that methanol extract of the aerial parts of Aerva lanata could be a source of natural anticancer and antioxidant compounds. In vitro cytotoxicity of the same extract was also assessed to link the finding with the potent anticancer activity of the experimental extract ($LC_{50}$ less than 50 ${\mu}g/ml$).

Application of Deep Transfer Learning for Estimating Solar Irradiance

Raihan Kamil,Hyunjin Lee 대한설비공학회 2021 대한설비공학회 학술발표대회논문집 Vol.2019 No.-

Road dust and its effect on human health: a literature review

Raihan K,Khan,Mark A,Strand 한국역학회 2018 Epidemiology and Health Vol.40 No.-

The purpose of this study was to determine the effects of road dust on human health. A PubMed search was used to extract references that included the words “road dust” and “health” or “fugitive dust” and “health” in the title or abstract. A total of 46 references were extracted and selected for review after the primary screening of 949 articles. The respiratory system was found to be the most affected system in the human body. Lead, platinum-group elements (platinum, rhodium, and bohrium), aluminum, zinc, vanadium, and polycyclic aromatic hydrocarbons were the components of road dust that were most frequently referenced in the articles reviewed. Road dust was found to have harmful effects on the human body, especially on the respiratory system. To determine the complex mechanism of action of various components of road dust on the human body and the results thereof, the authors recommend a further meta-analysis and extensive risk-assessment research into the health impacts of dust exposure.

Ownership Structure and Firm Performance: Evidence from Pharmaceutical and Chemical Industry of Bangladesh

Raihan SOBHAN 한국유통과학회 2022 Asian Journal of Business Environment (AJBE) Vol.12 No.4

Purpose: The main purpose of this study is to find out the impact of ownership structure on firm performance in the pharmaceutical and chemical industry of Bangladesh. Research design, data and methodology: The study has been conducted on 28 listed pharmaceutical and chemical companies from 2012 to 2020. Return on Assets (ROA) and Tobin’s Q are selected as indicators of internal and market performance of the firms respectively whereas institutional ownership, directors’ ownership and foreign ownership are selected as proxies of ownership structure. Panel analysis using random effects, lag method and time dummy method is used to analyse the relationship. Results: The study has found the existence of highly concentrated directors’ ownership, a low percentage of institutional ownership and a very insignificant proportion of foreign ownership in the industry. The regression results show that directors’ ownership has a positive and significant impact on firm performance, supporting the concept of agency theory. The study has also found a positive and significant impact of foreign ownership on firm performance. Unfortunately, the impact of institutional ownership is found to be insignificant. Conclusions: Directors’ ownership and foreign ownership decreases agency cost that ultimately increases firm performance. However, the role of institutional investors is not significant enough to improve firm performance. It is suggested that institutional investors should be more active and involved in monitoring the activities of the organisations to improve performance.

Ownership Structure and Firm Performance: Evidence from Pharmaceutical and Chemical Industry of Bangladesh

SOBHAN, Raihan Korea Distribution Science Association 2022 Asian journal of business environment Vol.12 No.4

Purpose: The main purpose of this study is to find out the impact of ownership structure on firm performance in the pharmaceutical and chemical industry of Bangladesh. Research design, data and methodology: The study has been conducted on 28 listed pharmaceutical and chemical companies from 2012 to 2020. Return on Assets (ROA) and Tobin's Q are selected as indicators of internal and market performance of the firms respectively whereas institutional ownership, directors' ownership and foreign ownership are selected as proxies of ownership structure. Panel analysis using random effects, lag method and time dummy method is used to analyse the relationship. Results: The study has found the existence of highly concentrated directors' ownership, a low percentage of institutional ownership and a very insignificant proportion of foreign ownership in the industry. The regression results show that directors' ownership has a positive and significant impact on firm performance, supporting the concept of agency theory. The study has also found a positive and significant impact of foreign ownership on firm performance. Unfortunately, the impact of institutional ownership is found to be insignificant. Conclusions: Directors' ownership and foreign ownership decreases agency cost that ultimately increases firm performance. However, the role of institutional investors is not significant enough to improve firm performance. It is suggested that institutional investors should be more active and involved in monitoring the activities of the organisations to improve performance.