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Spatio-Temporal Variability of Rainfall over Bangladesh During the Time Period 1969-2003
Shamsuddin Shahid,Osman Salleh Khairulmaini 한국기상학회 2009 Asia-Pacific Journal of Atmospheric Sciences Vol.45 No.3
Spatial and temporal variability of rainfall in Bangladesh has been studied in this paper from thirty-five years (1969-2003) of rainfall data recorded at 24 rain gauges distributed over the country. Long-term annual average rainfall, coefficient of variation of annual rainfall, precipitation concentration and aridity indices at each station have been computed and then interpolated using kriging method within a geographic information system to show the temporal and spatial variability of rainfall. Mann-Kendall test has been used to analyze the trend in rainfall data in different recording stations and the Sen’s slope method has been used to determine the magnitude of change. A moderate variation in inter-annual rainfall and high variation in intra-annual rainfall in Bangladesh have been observed. Non-significant positive trend of annual, monsoon and pre-monsoon rainfall, and a negative trend in winter rainfall are found in Bangladesh. Spatial distribution of rainfall trends shows that rainfall is increasing in the coastal zone and northern Bangladesh, and decreasing in the central part of the country. A declining trend of precipitation concentration is also observed in most of the stations. These results may be a first indication of the precipitation response to global warming ? a hypothesis which needs to be further investigated by means of climate model projections.
Shamsuddin AHAMAD,Abul Bashar BHUIYAN,Mohammad SOLAIMAN,Mohd Hasanur Raihan JOARDER 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.5
The study aimed to investigate the impact of the microfinance program on loan borrowers’ asset accumulation. In doing this, the study used descriptive and statistical methods to achieve the objectives. Primary data were collected from 192 respondents from Bangladesh using survey questionnaires. The data were analyzed using the multiple linear regression model. The result revealed that the majority of the borrowers said their assets such as farm, land, and livestock remained the same, which implies that microfinance borrowers still lag behind accumulating household assets. However, in the case of housing conditions and household appliances, there was a marginal increase. The regression result provides evidence that, among other factors, the amount of loan received from microfinance institutions and time duration with them is the most significant role-playing factor for borrower’s sustainable well-being. The age and education level of borrowers are identified as positively related to asset accumulations, but not substantially so. Moreover, training provided by microfinance institutions is not effective and influential for microfinance borrowers’ wealth accumulation, which is evidenced by the findings. This study’s insights are worthwhile for any microfinance institution’s decision-makers, development partners, and government to stress the shortcomings and accelerate the borrower’s wealth status.
Agung Shamsuddin Saragih,고태조 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.10
An alternative method is developed to remove metal from a work piece by combining a digital lithography system with biomachining. The purpose of this system is to obtain extra advantages as compared to conventional micro-fabrication processes currently used in practice. The use of microorganisms as a cutting tool in biomachining can eliminate the use of hazardous chemical materials, and the target surface is not affected by heat as a result of machining. The proposed process has a low material removal rate, but with less energy consumption. The greatest advantage is that the tools used in biomachining can be cultured continuously; i.e., they are renewable. Theoretically,the resolution of biomachining can reach 1 um due to the size of the bacteria. To achieve selective material removal, we combine the biomachining process with a polymer mask generated by a digital lithography (DL) system. In order to minimize errors and noise, the DL system was constructed by choosing robust and commonly available devices for most of the sub-tasks. This construction then can bring projected image onto work piece surface on fully controlled.
M . Shamsuddin,손홍용 ( H,Y . Sohn ) 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.5
Amongst various refractory metals, tungsten has the greatest potentiality for high temperature applications due to its exceptional strength to weight ratio at temperatures above 1370℃(2500。F). During the past three decades significant research efforts have been directed towards the improvement of the conventional methods of tungsten extraction and to devop new processes to reduce the number of steps from ore to metallic tungsten. In this paper geological occurrence of tungsten minerals and principles of benefication methods are outlined. The commercial processes of extraction from wolframite and scheelite and different approaches to the reduction of tungstic oxide are discussed. Methods of recovery from scrap and the current research efforts are also reviewed.
Extracting Single Source Geometric Error Value from a Double Ballbar Measurement Error Map
Saragih, Agung Shamsuddin,Ko, Tae Jo Trans Tech Publications, Ltd. 2013 Applied Mechanics and Materials Vol. No.
<P>The double ballbar (DBB) test is a well-known way to check the geometric error of axis interaction. The DBB test captures actual data from multiple error origins. Here, we define the DBB measurement result as the sinusoid error map model plus noise. Using this concept, we extract a single source geometric error value from the DBB error map by LS fitting. We considered the “noise” as mix error from other sources. To ensure the quality of a numerical fitting, we used a sinusoid model of each geometric error that was generated by simulation of axis movement based on homogeneous transformation matrices (HTMs) as general best-fit curve. To verify the proposed method, we extract a well-known geometric error of linear axes and compare it with the result from a commercial measurement system. This method is applicable to both a full circle and a truncated DBB test path. Then, we use the method to estimate the geometric error of axis interaction between linear and rotary axes in a five-axis machine. A sequence of DBB tests is arranged based on linear-linear and linear-rotary simultaneous motions. The tests contain seven DBB test runs with two setups, and are able to identify eleven geometry errors of interaction of axes in less time, and with less human “intervention” error.</P>