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RISS 인기검색어
- 검색키워드
- 저자 : Md. Ashikur Rahman (검색결과 5 건)
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Md Ashikur Rahman,이수현,박정희 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
This study aimed to develop a simple way to design a durable functional superhydrophobic cotton surface by usinga self-assembled octadecylamine (ODA) layer to support formation of a micro/nanostructure with hexadecyltrimethoxysilane(HDTMS) in aqueous dispersion. The effect of a molar ratio in the mixture of ODA and HDTMS on superhydrophobicity,surface morphology, chemical composition and wettability were investigated. When the cotton fabric was treated with ODAonly, petal-like structures were formed and the surface exhibited a water contact angle (WCA) of 93 ° and shedding angle(SA) of above 90 °. When the fabric was treated with HDTMS only, the surface became more hydrophobic with a WCA of137 ° and a SA of 18 °. The specimen treated with the solution of ODA/HDTMS mixture, however, micro/nanoscalestructures were formed on the surface and represented superhydrophobic properties with a WCA of 161 ° and a SA of 8 °. The optimum superhydrophobicity was shown at the 1:3 molar ratio of ODA/HDTMS. After peeling or washing test, WCAslightly decreased and SA increased. Interestingly, the fabric partially damaged by washing or acid/alkali treatment restoredits superhydrophobicity after drying at room temperature. Air permeability of the specimen treated at the optimum conditiondecreased, but the water vapor transmission rate was nearly maintained with only a slight decrease. The contribution of thisstudy is the fabrication of superhydrophobic cotton fabric with durable/self-healing performance and breathability via a onestepwater-based dip-coating method allowing to reduce the surface energy and forming micro/nanoscale roughness at thesame time in an aqueous system.
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Rahman, Mohammed Mahabubur,Tsukamoto, Jiro,Tokumoto, Yuji,Shuvo, Md. Ashikur Rahman Institute of Forest Science 2013 Journal of Forest Science Vol.29 No.1
Decomposition of plant material is an important component in the study of forest ecosystem because of its critical role in nutrient cycling. Different tree species has different nutrient release patterns, which are related to leaf litter quantitative traits and seasonal environmental factors. The quantitative traits of leaf litter are important predictors of decomposition and decomposition rates increase with greater nutrient availability in the forest ecosystems. At the ecosystem level, litter quantitative traits are most often related to the physical and chemical characteristics of the litter, for example, leaf toughness and leaf mass per unit area, and lignin content tannin and total phenolics. Thus, the analysis of litter quantitative traits and decomposition are highly important for the understanding of nutrient cycling in forest ecosystems. By studying the role of litter quantitative traits on decomposition and nutrient cycling in forest ecosystems will provide a valuable insight to how quantitative traits influence ecosystem nutrient dynamics. Such knowledge will contribute to future forest management and conservation practices.
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Md Mehedee Hasan,Ashikur Rahman Swapon,Tazrin Islam Dipti,Yeong-Jin Choi,Hee-Gyeong Yi The Korean Society for Microbiology and Biotechnol 2024 Journal of microbiology and biotechnology Vol.34 No.5
This study explores the potential of plant-based decellularization in regenerative medicine, a pivotal development in tissue engineering focusing on scaffold development, modification, and vascularization. Plant decellularization involves removing cellular components from plant structures, offering an eco-friendly and cost-effective alternative to traditional scaffold materials. The use of plant-derived polymers is critical, presenting both benefits and challenges, notably in mechanical properties. Integration of plant vascular networks represents a significant bioengineering breakthrough, aligning with natural design principles. The paper provides an in-depth analysis of development protocols, scaffold fabrication considerations, and illustrative case studies showcasing plant-based decellularization applications. This technique is transformative, offering sustainable scaffold design solutions with readily available plant materials capable of forming perfusable structures. Ongoing research aims to refine protocols, assess long-term implications, and adapt the process for clinical use, indicating a path toward widespread adoption. Plant-based decellularization holds promise for regenerative medicine, bridging biological sciences with engineering through eco-friendly approaches. Future perspectives include protocol optimization, understanding long-term impacts, clinical scalability, addressing mechanical limitations, fostering collaboration, exploring new research areas, and enhancing education. Collectively, these efforts envision a regenerative future where nature and scientific innovation converge to create sustainable solutions, offering hope for generations to come.
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DCT and DWT Based Robust Audio Watermarking Scheme for Copyright Protection
Kaushik Deb,Md. Ashikur Rahman,Kazi Zakia Sultana,Iqbal Hasan Sarker,정의필 한국융합신호처리학회 2014 융합신호처리학회 논문지 (JISPS) Vol.15 No.1
Digital watermarking techniques are attracting attention as a proper solution to protect copyright for multimedia data. This paper proposes a new audio watermarking method based on Discrete Cosine Transformation (DCT) and Discrete Wavelet Transformation (DWT) for copyright protection. In our proposed watermarking method, the original audio is transformed into DCT domain and divided into two parts. Synchronization code is applied on the signal in first part and 2 levels DWT domain is applied on the signal in second part. The absolute value of DWT coefficient is divided into arbitrary number of segments and calculates the energy of each segment and middle peak. Watermarks are then embedded into each middle peak. Watermarks are extracted by performing the inverse operation of watermark embedding process. Experimental results show that the hidden watermark data is robust to re-sampling, low-pass filtering, re-quantization, MP3 compression, cropping, echo addition, delay, and pitch shifting, amplitude change. Performance analysis of the proposed scheme shows low error probability rates.
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DCT and DWT Based Robust Audio Watermarking Scheme for Copyright Protection
Deb, Kaushik,Rahman, Md. Ashikur,Sultana, Kazi Zakia,Sarker, Md. Iqbal Hasan,Chong, Ui-Pil The Korea Institute of Convergence Signal Processi 2014 융합신호처리학회 논문지 (JISPS) Vol.15 No.1
Digital watermarking techniques are attracting attention as a proper solution to protect copyright for multimedia data. This paper proposes a new audio watermarking method based on Discrete Cosine Transformation (DCT) and Discrete Wavelet Transformation (DWT) for copyright protection. In our proposed watermarking method, the original audio is transformed into DCT domain and divided into two parts. Synchronization code is applied on the signal in first part and 2 levels DWT domain is applied on the signal in second part. The absolute value of DWT coefficient is divided into arbitrary number of segments and calculates the energy of each segment and middle peak. Watermarks are then embedded into each middle peak. Watermarks are extracted by performing the inverse operation of watermark embedding process. Experimental results show that the hidden watermark data is robust to re-sampling, low-pass filtering, re-quantization, MP3 compression, cropping, echo addition, delay, and pitch shifting, amplitude change. Performance analysis of the proposed scheme shows low error probability rates.
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