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Development of a Model to Optimize the Supply Chain Management and it's Application
No full textThis thesis is submitted to the Department of Industrial Engineering and Management, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Engineering in Industrial Engineering and Management, December 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 31-34).The mam objective of this research is to develop a mathematical model for supply chain
transportation costs. This model consider the real time data of the transportation cost incurring
elements which helps in achieving optimization. Though it has been case studied for a particular
company but it's been generalized for all aspects of supply chain network under some specific
conditions. In this research Theory of Constraint (TOC) has been applied to identify the main
constraints to its goal. The main constraint are found supply chain transportation cost which
significantly impact on supply chain profit. Thinking process has been developed to propose a
conceptual model regarding the constraints. The case study has been performed for 30 days and
found 32.68% better results for one complete transportation cycle compared to existing
transportation modes. The ways the model optimize the transportation cost by managing vehicle
route, fleet size and number of moves throughout the transportation network. Finally, this model
offering significant results in throughput accounting of supply chain transportation that leads to
optimize overall supply chain costs.Md. Al AminMaster of Science in Engineering in Industrial Engineering and Managemen
An Efficient Compression Scheme for Large Natural Language Text
No full textThis thesis is submitted to the Department of Computer Science and Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Computer Science and Engineering, September 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 52-56).Data compression is the route towards adjusting, encoding or changing the bit structure of
information so that it requires less space. Data compression is a decrease in the quantity of
bits expected to demonstrate the data. Compacting data can spare stockpiling limit,
accelerate record exchange, and lessening costs for capacity equipment and system transfer
speed. Data compression covers a huge space of jobs including data correspondence, data
putting away and database improvement. In the same way, Text compression can be as
straightforward as expelling every unneeded character, embedding a solitary recurrent
character to demonstrate a string of rehashed characters and substituting a little piece string
for a habitually happening bit string. The fundamental standard behind compression is to
build up a strategy or convention for utilizing less bits to express the actual data. Character
encoding is fairly identified with data compression which represents a character by a type
of encoding system. In this thesis, an efficient and simple compression algorithm for large
natural text named n-Sequence based m Bit Compression (nSmBC) is proposed which can
able to beat WinZip and WinRAR in terms of compression ratio. WinZip and WinRAR are
two well-known compression techniques used for text compression in the industry. The
scheme provides an efficient encoding algorithm that converts an 8 bit character by 5 bits
utilizing a look up table. The look up table is produced by using Zipf’s distribution which
is a discrete distribution of commonly used characters in different languages. 8 bit characters
are converted to 5 bits by partitioning the characters into 7 sets. After converting the
characters into 5 bit, an n-sequence scheme is developed to logically calculate the location
number of a particular combination of characters. The reverse algorithm to recover the
actual input is further demonstrated. The algorithm is finally compared with the well-known
WinZip, WinRAR, Huffman and LZW techniques. Promising performance is demonstrated
both by theoretical and experimental analysis.Md. Ashiq MahmoodMaster of Science in Computer Science and Engineerin
Investigation of the Structural, Magnetic and Transport Properties of Yttrium Substituted Ni-Zn Ferrites
No full textThis thesis is submitted to the Department of Physics, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Masters of Science in Physics, February 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 78-83).The present research work is focused on Yttrium (Y) doped Ni-Zn ferrites. The ferrite samples of
the composition Ni0.25Zn0.75YxFe2-xO4 [where x= 0.00, 0.02, 0.04, 0.06 and 0.08] were
synthesized by conventional solid state reaction method. As a part of synthesis the samples were
pre-sintered at 850°C for 2 hours and sintered at 1150°C for 3 hours. The effect of rare earth Y3+
substitution on the structural, magnetic and electrical properties of the Ni-Zn ferrites was studied.
The phase identification and lattice parameter determination were carried out by using X-ray
diffraction (XRD). XRD patterns show that all the samples consisted of the single phase cubic
spinel structure with an extra peak in x=0.08. The lattice parameters gradually increases with
increasing Y content but it slightly decreased for x=0.08. The bulk density suddenly decrease for
x=0.02 then increases with increasing rare earth Y3+ ion and again slightly decreased for x=0.08.
The X-ray density increases continuously with increasing x-content. The microstructural analysis
was done by Scanning Electron Microscopy (SEM). The SEM images show that the samples
exhibit uniform surface morphology with well-defined spherical grains. The average grain size
was calculated using Image J software and it can be observed that the average grain size
gradually increased with Y content except x=0.08 where it decreases suddenly. The complex
permeability, loss tangent and dielectric properties were investigated as a function of frequency
range 1 KHz to 120 MHz by using an impedance analyzer. The initial permeability was found in
steady state to a higher order of frequency range from 103 Hz - 50 MHz. Continuous decrease of
the dielectric constant with the increasing frequency and remains almost constant at higher
frequency range has been observed. The magnetic properties have been studied by Vibrating
Sample Magnetometer (VSM). The saturation magnetization(Ms), coercivity(Hc), remanent
magnetization(Mr) and the ratio of remanent magnetization and saturation magnetization have
been calculated from the M-H loop at room temperature. The values of Ms were decreases with
increasing Y3+ content. Moreover, coercivity decreases with increasing Y content. Doping of Y
ion lowers the conduction and subsequently an increase in resistivity is observed. The
characteristics of electromagnetism, excellent chemical stability, mechanical hardness, high
coercivity, and moderate saturation magnetization have made Y doped Ni-Zn ferrite a good
candidate for synthesizing and investigation to contribute in science and technology.Sharmin AkterMasters of Science in Physic
Volumetric and Viscometric Properties of N-Acetylcysteine in Dimethylformamide Containing Binary and Ternary Mixtures
No full textThis thesis is submitted to the Department of Chemistry, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Chemistry, 29 June, 2019.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 74-80).The density and viscosity of NAC (0.10 to 1.00) mol.L−1 in H2O, DMF and DMF–
H2O mixed solutions were measured and studied over the entire molarity range with in
the temperature range of 298.15 to 318.15 K at 5 K interval. The apparent molar
volumes, were determined from density values experimented by Density and Sound
Velocity Meter (DSA 5000M) Anton Paar, Austria. In the NAC–H2O and NAC in [1:4]
and [2:3] [DMFH2O] solvent systems the apparent molar volumes of NAC were found
to be increased, whereas in the NAC–DMF and NAC in [4:1] and [3:2] [DMFH2O]
solvent systems apparent molar volumes of NAC were found to be decreased. Apparent
molar volume at infinite dilution, 0
v and Sv values were also computed according to the
experimented density values. The apparent molar volume at infinite dilution provided an
idea about the presence of solutesolvent interactions of the investigated systems. Sv, the
experimental slopes which provided an idea about the prevailing solutesolute
interactions in the mixtures. Both 0
v and Sv values indicated that there both solute-solute
and solute-solvent interactions present in the binary as well as in ternary solutions.
The investigated systems showed hasty increase of viscosity values with the increased
NAC concentration but the values of viscosity decreased with the increase of
temperature. In binary and ternary systems showed the similar trend viscosity changes
but in different order of magnitude. The order for binary and ternary systems are: NAC–
DMF > NACH2O and NAC in [3:2] [DMF–H2O] > NAC in [4:1] [DMF–H2O] > NAC
in [2:3] [DMF–H2O] > NAC in [1:4] [DMF–H2O] > NAC–DMF > NACH2O,
respectively. The viscosity values were employed to determine the viscosity coefficients
i.e., A and B-coefficients; change of free energy, G*; change of enthalpy, H* as well
as change of entropy, S*. Negative values of A and positive values of B co-efficients
suggesting that weak solute-solute but strong solute-solvent interaction present in the
binary and ternary solution, respectively. From these thermodynamic parameters state of
the spontaneity of the investigated systems were known. On the basis of this data, the
predominant molecular interactions occurring between NAC–H2O and NAC in [1:4] and
[2:3] [DMFH2O] solvent systems were found to be solute-solute interaction, where as
in NAC–DMF and NAC in [4:1] and [3:2] [DMFH2O] solvent systems solute-solvent
interaction were predominant.Gopal PalMaster of Science in Chemistr
