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pH 완충 용액 환경에서 기가급 강도의 강철과 열 영향부에서 발생하는 피로균열 전파에 대한 부식 영향 연구
Humayun Kabir,이흥식 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In this study, corrosion fatigue crack propagation was investigated in pH buffer environment using the giga strength steel and its heat-affected zone, and the results were compared with theoretical model prediction. Also, the pure corrosion effect on fatigue crack propagation in a corrosive environment was compared with the modified Forman equation. As results, the average value of corrosion rate obtained as the ratio of the net corrosion-induced crack length to the total crack length under cyclic loading in the base metal and heat-affected zone under experimental loading conditions. These results exhibit a new theoretical method for corrosion fatigue crack propagation that predicts a purely corrosion effect on the behavior to be determined.
근대 중 Dimethomorph의 잔류 양상 및 위해성 평가
( Humayun Kabir ),( Musfiqur Rahman ),( Abd El-aty ),정형석 ( Hyung Suk Chung ),이한솔 ( Han Sol Lee ),심재한 ( Jae-han Shim ) 한국환경농학회 2017 한국환경농학회 학술대회집 Vol.2017 No.-
The residue analysis of dimethomorph in Swiss chard cultivated at two different locations under plastic house conditions were carried out using liquid chromatography-ultraviolet detector (LC-UVD). The LC-UVD result was confirmed using liquid chromatography-tandem mass spectrometry (LC-MS/MS). The sample was collected randomly over 14 days. The sample extracted using acetonitrile and partitioning by solid liquid extraction using 15 g NaCl, for cleanup florisil solid phase extraction (SPE) cartridge was used. The standard showed excellent linearity in the range (0.05-50.0 mg/L) with correlation coefficient (R<sup>2</sup>=0.9996), and the recovery ranged from (82.98-95.43%) with relative standard deviaton (RSD) less than 5.12% and the limit of detection and quantification was 0.0033 and 0.01 mg/kg respectively. The initial (0 day) residue amount was 7.57 and 8.55 mg/kg for site 1 and site 2 respectively. The dissipation half life was 5.0/5.1 days for site 1/site2. Pre harvest residue limit (PHRL) curve showed if the residue amount below 50.14/49.83 mg/kg 5 days before harvest and below 83.81/82.27 mg/kg 10 days before harvest then the residue will be below the maximum residue limit (MRL) 30.0 mg/kg during the harvest. The risk assessment considering the experimental conditions and Korean peoples diet habits, the accepted daily intake (ADI)% at 0 days sample 0.084/0.094% and at 10 days sample 0.014%. The lowe ADI % showed the safety of uses of this pesticide on Swiss chard and these data may be useful to recommend for the use of this pesticide on some similar vegetables.
Nuclear Medicine Theranostics: Perspective from Pakistan
Humayun Bashir,M. Numair Younis,M. Rehan Gul 대한핵의학회 2019 핵의학 분자영상 Vol.53 No.1
Nuclear medicine has been offering diagnostic and therapeutic solution since the introduction of radioactive iodine for thyroid diseases since decades. However, the concept of theranostics has given a new found impetus to the use of pairs of radiopharmaceuticals for diagnosis and treatment. Presented here is a perspective on theranostics from Pakistan.
Humayun Kabir,이흥식 한국기계기술학회 2022 한국기계기술학회지 Vol.24 No.4
In this paper, a simulation computerized crash analysis evaluation method through reverse engineering was applied to the Defender vehicle to systemize and simplify the certification of small-scale electric vehicles. The Defender vehicle was selected as a benchmarking vehicle that converts into an electric vehicle, and the layout of the frame and element analysis of individual parts were conducted through reverse engineering. To review the vehicle package layout, the fastening and assembly method for each part was analyzed referring to the Defender maintenance guide and parts list, and it was used for frame element technology analysis. In addition, collisions according to the main frame material and the shape of the crash box were analyzed, and various cases were analyzed through parameter study. As a result of the crash analysis, it was found that the mild steel main frame could not guarantee the safety of the vehicle in a fixed wall collision situation, and the ATOS material would increase the collision safety of the Defender relatively. Through the crash analysis according to the shape of the crash box, it was found that the strength of the crash box is too high compared to the main body, and this should be reflected in the design for small-volume production of multiple products.
Machine Learning Based Adaptive Context-Aware System for Smart Home Environment
M. Humayun Kabir,M. Robiul Hoque,Hyungyu Seo,Sung-Hyun Yang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.11
Context-awareness is the key element for building a smart home environment. The goal of a smart home is to predict the demand of home users and proactively provides the proper services by considering the user’s context information. Several methods are used in context-aware system to provide services. Machine learning based approaches are capable to make better prediction and adaptation than others. In this paper, we present machine learning based context-aware system which can provide service according to the trained model. Two effective learning algorithms: Back propagation Neural Network, and Temporal Differential (TD) class of reinforcement learning are used for prediction and adaptation respectively. This ap