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Mohammed Mahabubur Rahman1,Md. Motiur Rahman,Mahbubul Alam 강원대학교 산림과학연구소 2010 Journal of Forest Science Vol.26 No.3
A study was conducted for indentifying the floral biodiversity of woody species by calculating four diversity indices using data collected from 4 stands of different age groups and disturbance regimes in two areas of Madhupur tract. Results showed that highest species diversity in the old growth secondary coppice forest (>60 years) under moderate anthropogenic disturbances of Madhupur National Park area (delete (D=0.74, Hʼ=3.36) followed by old growth secondary forest stands (>40 years) under moderate disturbances at Bhawal National Park area (D=0.65, Hʼ=2.81). Plant species diversity of the young enrichment plantations (<20 years and <15 years) under high anthropogenic disturbances in both the areas are much low (D=0.54 and Hʼ=2.16 and D=0.52 and Hʼ=1.92 respectively), which indicate high anthropogenic disturbances coupled with introduction of invasive exotics that are rival for endemic species are detrimental for conservation of biological diversity of tropical moist deciduous forests of Madhupur tract in Bangladesh.
Multi-layered attentional peephole convolutional LSTM for abstractive text summarization
Rahman, Md. Motiur,Siddiqui, Fazlul Hasan Electronics and Telecommunications Research Instit 2021 ETRI Journal Vol.43 No.2
Abstractive text summarization is a process of making a summary of a given text by paraphrasing the facts of the text while keeping the meaning intact. The manmade summary generation process is laborious and time-consuming. We present here a summary generation model that is based on multilayered attentional peephole convolutional long short-term memory (MAPCoL; LSTM) in order to extract abstractive summaries of large text in an automated manner. We added the concept of attention in a peephole convolutional LSTM to improve the overall quality of a summary by giving weights to important parts of the source text during training. We evaluated the performance with regard to semantic coherence of our MAPCoL model over a popular dataset named CNN/Daily Mail, and found that MAPCoL outperformed other traditional LSTM-based models. We found improvements in the performance of MAPCoL in different internal settings when compared to state-of-the-art models of abstractive text summarization.
지진시 재료 비선형효과를 고려한 TMD가 설치된 콘크리트 구조물의 진동제어
모터라만 ( Md Motiur Rahman ),타미나나하르 ( Tahmina Tasnim Nahar ),장성규 ( Sungkyu Chang ),김두기 ( Dookie Kim ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
This paper concern the performance of tuned mass damper (TMD) and dynamic behaviour of TMD controlled structure considering constitutive material model. A three-storied reinforced concrete frame is modelled using OpenSees for this study. Considering the non-linear materials model, the performance of the TMD not only rely on the mass, stiffness and damping of the system but also on the parameter to be controlled by TMD and the input ground motion types. For this reason in this study some practical, sine sweep and damped sine sweep are considered as input excitation to the evaluate exact dynamic behaviour of TMD controlled structure.
Rahman, Mohammed Mahabubur,Rahman, Md. Motiur,Alam, Mahbubul Institute of Forest Science 2010 Journal of Forest Science Vol.26 No.3
A study was conducted for indentifying the floral biodiversity of woody species by calculating four diversity indices using data collected from 4 stands of different age groups and disturbance regimes in two areas of Madhupur tract. Results showed that highest species diversity in the old growth secondary coppice forest (>60 years) under moderate anthropogenic disturbances of Madhupur National Park area (delete (D=0.74, H'=3.36) followed by old growth secondary forest stands (>40 years) under moderate disturbances at Bhawal National Park area (D=0.65, H'=2.81). Plant species diversity of the young enrichment plantations (<20 years and <15 years) under high anthropogenic disturbances in both the areas are much low (D=0.54 and H'=2.16 and D=0.52 and H'=1.92 respectively), which indicate high anthropogenic disturbances coupled with introduction of invasive exotics that are rival for endemic species are detrimental for conservation of biological diversity of tropical moist deciduous forests of Madhupur tract in Bangladesh.
Abbas Bigdeli,Md. Motiur Rahman,Dookie Kim 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.88 No.3
This study investigates the effectiveness of tuned mass dampers (TMDs) in controlling vibrations in low-rise reinforced concrete buildings. It examines both linear and nonlinear behaviors of concrete structures subjected to strong ground motions from the PEER database. The research follows the ASCE 7-16 provisions to model structural nonlinearity. Additionally, the study explores the effect of varying TMD mass ratios on the performance of these systems in real-world conditions. The findings emphasize the importance of accounting for structural nonlinearity in low-rise buildings, highlighting its significant influence on the controlled response under severe seismic excitations. The study suggests including nonlinear analysis in seismic design practices and recommends customizing TMD designs to optimize vibration control. These recommendations have practical implications for enhancing the safety and effectiveness of seismic design practices for low-rise buildings.
Tahmina Tasnim Nahar,Md Motiur Rahman,김두기 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
The area of this study will cover the location-wise seismic response variation of an electrical cabinet innuclear power point (NPP) based on classical reliability analysis. The location-based seismic groundmotion (GM) selection is carried out with the help of probabilistic seismic hazard analysis using PSHRisktool,where the variation of reliability analysis can be understood from the relation between the reliabilityindex and intensity measure. Two different approaches such as the first-order second momentmethod (FOSM) and Monte Carlo Simulation (MCS) are helped to evaluate and compare the reliabilityassessment of the cabinet. The cabinet is modeled with material uncertainty utilizing Steel01 as thematerial model and the fiber section modeling approach is considered to characterize the section'snonlinear reaction behavior. To verify the modal frequency, this study compares the FEM result withrecorded data using Least-Squares Complex Exponential (LSCE) method from the impact hammer test. Inspite of a few investigations, the main novelty of this study is to introduce the reader to check andcompare the seismic reliability assessment variation in different seismic locations and for differentearthquake levels. Alongside, the betterment can be found by comparing the result between twoconsidered reliability estimation methods.
Seismic capacity evaluation of fire-damaged cabinet facility in a nuclear power plant
Nahar, Tahmina Tasnim,Rahman, Md Motiur,Kim, Dookie Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.4
This study is to evaluate the seismic capacity of the fire-damaged cabinet facility in a nuclear power plant (NPP). A prototype of an electrical cabinet is modeled using OpenSees for the numerical simulation. To capture the nonlinear behavior of the cabinet, the constitutive law of the material model under the fire environment is considered. The experimental record from the impact hammer test is extracted trough the frequency-domain decomposition (FDD) method, which is used to verify the effectiveness of the numerical model through modal assurance criteria (MAC). Assuming different temperatures, the nonlinear time history analysis is conducted using a set of fifty earthquakes and the seismic outputs are investigated by the fragility analysis. To get a threshold of intensity measure, the Monte Carlo Simulation (MCS) is adopted for uncertainty reduction purposes. Finally, a capacity estimation model has been proposed through the investigation, which will be helpful for the engineer or NPP operator to evaluate the fire-damaged cabinet strength under seismic excitation. This capacity model is presented in terms of the High Confidence of Low Probability of Failure (HCLPF) point. The results are validated by the proper judgment and can be used to analyze the influences of fire on the electrical cabinet.
Seismic Response Characterization of Shear Wall in Auxiliary Building of Nuclear Power Plant
모터 라만,타미나 나하르,백건휘,김두기,Rahman, Md Motiur,Nahar, Tahmina Tasnim,Baek, Geonhwi,Kim, Dookie Earthquake Engineering Society of Korea 2021 한국지진공학회논문집 Vol.25 No.3
The dynamic characterization of a three-story auxiliary building in a nuclear power plant (NPP) constructed with a monolithic reinforced concrete shear wall is investigated in this study. The shear wall is subjected to a joint-research, round-robin analysis organized by the Korea Atomic Energy Research Institute, South Korea, to predict seismic responses of that auxiliary building in NPP through a shake table test. Five different intensity measures of the base excitation are applied to the shaking table test to get the acceleration responses from the different building locations for one horizontal direction (front-back). Simultaneously to understand the global damage scenario of the structure, a frequency search test is conducted after each excitation. The primary motivation of this study is to develop a nonlinear numerical model considering the multi-layered shell element and compare it with the test result to validate through the modal parameter identification and floor responses. In addition, the acceleration amplification factor is evaluated to judge the dynamic behavior of the shear wall with the existing standard, thus providing theoretical support for engineering practice.
박대욱,Tri Ho Minh Le,Md Motiur Rahman,신이수 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2
The sudden bump at the transition area from the bridge usually cultivates to vigorous railway deterioration because of the variation in the railway’s supporting foundation. Therefore, this study focuses on the development of an advanced lightweight backfill material that can resolve the serious settlement in the transition zone. Besides, due to the strict soil properties requirements for construction, some excavated local soils are not preferred. This issue leads to the expansion in the construction budgets and the consumption of natural resources. In this research, the usage of excavated locally silty soil can mitigate this issue. To improve the self-leveling of fresh material and further broaden the range of applications, the air-foam technique is integrated into this material with a ratio of 10% by volume. The resilient modulus test was conducted to investigate the engineering characteristic of the backfill mixture. The reinforcing effect of the lightweight backfill was then evaluated through the numerical simulation method under repeated trainloads and earthquakes. Overall, the laboratory and the simulation results suggest a potential application of lightweight soil as a sustainable material since this material can substantially enhance the durability of the railway structure and provide smoothness for train operation.
지진구역 내 손상단계를 고려한 콘크리트 중력댐의 파괴 위험 분석
타미나나하르 ( Tahmina Tasnim Nahar ),김두기 ( Dookie Kim ),모터라만 ( Md Motiur Rahman ),장성규 ( Sungkyu Chang ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
Failure risk investigation of any structure in a seismic zone can be done by the seismic probabilistic risk assessment (SPRA), which became a very attractive area of research in terms of safety measurement. This paper introduces such kind of concept to identify which magnitude in a specific seismic zone will contribute more vulnerable failure point in a structure. Here, for implement this idea a case study on a concrete gravity dam has been carried out. In order to make a correlation between the magnitude and failure risk contribution based on different damage stage, a combination of seismic hazard analysis and the probability of structural collapse is adopted. Therefore, the deaggregation of the mean annual frequency of failure risk by magnitude is used in this study to quantify four different limit stages of failure identification criteria. Consequently, from analyzing the result, in case of concrete gravity dam, this deaggregation approach shows the tensile crack in the base looks more vulnerable damage stage for the specific seismic zone.