-
A Mobile Device Controlled Colonoscope
Corey Sheerer,
Jung Hun Choi
Issue:
Volume 8, Issue 1, February 2020
Pages:
1-7
Received:
14 October 2019
Accepted:
23 December 2019
Published:
8 January 2020
Abstract: The background: Colorectal cancer is a prevalent and deadly disease that is further emerging within our society. As knowledge about this disease becomes more widespread, increasing demand for screening and high standards arises. This creates a need for a device which can be more easily mastered by physicians to achieve competency, as well as reduce injury risks from performing repetitive motions during a heavy load of colonoscopy procedures. Method: This research focuses on the fabrication of a prototype colonoscope that incorporates a holding structure to support the colonoscope and a hand-held device that actuates distal tip steering. Experimentation was performed to compare a learning curve of the prototype scope to a conventional scope. Results: Results show that subjects using the prototype scope did not experience any significant reduction in force in either the thumb or forearm. Cecal intubation time and learning rate showed no significant decrease while using the prototype scope compared to a conventional scope. Concluison: The prototype of the automated scope did not reduce learning rate or offset intubation time, it also did not increase the learning rate or, for the most part, increase intubation time compared to a conventional scope.
Abstract: The background: Colorectal cancer is a prevalent and deadly disease that is further emerging within our society. As knowledge about this disease becomes more widespread, increasing demand for screening and high standards arises. This creates a need for a device which can be more easily mastered by physicians to achieve competency, as well as reduce...
Show More
-
Characterization of Single Enset Fiber Tensile Properties Using Optimal Experimental Design and Digital Image Correlation Technique
Abebayehu Abdela,
Mark Versteyhe,
Fasil Taddese
Issue:
Volume 8, Issue 1, February 2020
Pages:
8-15
Received:
13 March 2019
Accepted:
31 December 2019
Published:
9 January 2020
Abstract: With the majority of the world’s fiber use relying on wood, cotton and petrochemicals, the use of alternative fiber sources in manufacturing is rapidly gaining importance in reaching the Sustainable Development Goal’s on innovation and responsible production. Lucidly, Enset is a main staple crop in southern and central Ethiopia where the pulp is fermented for food production but its strong fibers are now only used for local rope making or they are discarded. Hence, importance of processing this agricultural product for industrial application is explicit and characterization is, thus, mandatory. This paper presents the characteristics of a single Enset fiber in tension using Optimal Experiment Design and Digital Image Correlation techniques. To do so, Enset fiber sample with 10cm length glued to sand paper case with TIPIX application and speckle formation is prepared. Fiber density is measured by a Pycnometer to estimate a cross sectional area. Then, a known amount of load has been gradually applied until failure. And, images are taken while the extension is taking place using the limes camera. The retort of every point is used with analogue data to make a correlation using correlated solution software (Vic2D), and related scrutiny to determine fiber properties. Bundle test has also been used to reinforce the result. This work reports the properties of the fiber to be: Density: 1.4 g/cm3; Strength: 67Mpa-923Mpa, Mean strength: 647MP; E modulus: 12Gpa-69Gpa, Mean E modulus: 46MPa. Here, the major reason behind the smallest value in the range is the manual fiber extraction utilized in light of extracting the pulp.
Abstract: With the majority of the world’s fiber use relying on wood, cotton and petrochemicals, the use of alternative fiber sources in manufacturing is rapidly gaining importance in reaching the Sustainable Development Goal’s on innovation and responsible production. Lucidly, Enset is a main staple crop in southern and central Ethiopia where the pulp is fe...
Show More
-
A Fault Detection Approach Using Variational Mode Decomposition, L-kurtosis and Random Decrement Technique for Rotating Machinery
Issue:
Volume 8, Issue 1, February 2020
Pages:
16-26
Received:
6 January 2020
Accepted:
21 January 2020
Published:
31 January 2020
Abstract: Fault detection of rotating machinery under heavy noise background, is a significant but difficult issue, and traditional fault detection approaches are difficult to apply. To address this problem, a novel approach that combines variational mode decomposition (VMD), L-Kurtosis and random decrement technique (RDT) is proposed, which procedures are summarized as follows. First, the raw vibration signal collected from the rotating component is decomposed using VMD into a set of intrinsic mode functions (IMFs), and the noise components can be separated from the raw signal. Second, the L-Kurtosis indicator is introduced to solve the problem that the fault information is difficult to track, and the optimal intrinsic mode function (IMF) can be determined according to the maximum L-Kurtosis value. Then, RDT is further employed to purify the optimal IMF to eliminate the other unknown interference sources. Finally, a Hilbert envelope spectrum analysis is used for detecting the fault type. In order to validate the proposed approach, the numerical simulations and real experimental investigations about rolling element bearing and gear are conducted. The results illustrate that the proposed approach can effectively detect faults of rotating components.
Abstract: Fault detection of rotating machinery under heavy noise background, is a significant but difficult issue, and traditional fault detection approaches are difficult to apply. To address this problem, a novel approach that combines variational mode decomposition (VMD), L-Kurtosis and random decrement technique (RDT) is proposed, which procedures are s...
Show More
-
An Intelligent Regenerative Braking Strategy for Power-split Hybrid Electric Vehicle
Quoc-Viet Huynh,
Ly Vinh Dat,
Khanh-Tan Le
Issue:
Volume 8, Issue 1, February 2020
Pages:
27-33
Received:
20 December 2019
Accepted:
17 January 2020
Published:
13 February 2020
Abstract: Nowadays, hybrid electric vehicle (HEV) is a popularly vehicle due to its advances such as reducing fossil fuel consumption and emissions that affect on environment. Brake energy regeneration system is essential part in HEV and electric vehicle. It assists HEV in reducing fuel consumption and pollution emission. Regenerative braking system aims to discard heat energy from mechanical braking as vehicle decelerated. Therefore, design and develop a suitable regenerative braking system were always intended. The braking control strategies were variation and improvement. The mechanical – electric braking system was utilized. This braking system must achieve the criteria such as safety, stability, maximum energy recovery and the shortest the braking distance. This paper proposed a control strategy for this hybrid braking system. Firstly, braking performances were satisfied by braking torque distribution strategy between front and rear axles. Secondly, maximum energy recovery was computed by compromising between mechanical and electric braking torque. Two issues were implemented by applying fuzzy logic and rule-based to design the braking torque controllers. Two controllers were estimated through the results of simulation in power-split HEV. The controller, applied fuzzy-based, had significant improvements in fuel consumption compare with another one. In addition, this controller was more flexible in various driving conditions.
Abstract: Nowadays, hybrid electric vehicle (HEV) is a popularly vehicle due to its advances such as reducing fossil fuel consumption and emissions that affect on environment. Brake energy regeneration system is essential part in HEV and electric vehicle. It assists HEV in reducing fuel consumption and pollution emission. Regenerative braking system aims to ...
Show More
-
Intermodal Transport as the Main Driver for Improving Logistics Costs - A Study of Viet Nam - Based Logistics Service Users
Ho Thi Thu Hoa,
Le Van Thanh,
Chu Thi Hue,
Mai Van Thanh,
Bui Van Hung
Issue:
Volume 8, Issue 1, February 2020
Pages:
34-39
Received:
7 November 2019
Accepted:
13 January 2020
Published:
17 February 2020
Abstract: Intermodality has become a major component of the systems approach to business, which is an integral part of what is commonly called “logistics management”. Another benefit of intermodality has been the cooperation between government and private enterprise in reducing unnecessary documentation, enabling goods in transit to keep pace with demand, enabling an efficient and cost-effective use of the transport system through unbroken chain and customer oriented door-to-door services. The economic basis for intermodal transport is to display favourable economic and operational characteristics individually, can be integrated in a door-to-door transport chain in order to improve the overall efficiency of the transport system. Intermodal transportation is a response to changes of international trade requirements for moving all types of cargo. Logistics costs are among important factors affecting the competitiveness of both companies and nations in the world. Companies can increase their competitiveness by reducing their logistics costs in which the transport costs share the highest propotion, as a result, the total costs of products and services can be reduced. The aim of this article is to evaluate the importance role of intermodal transport as the main factor which will contribute to improve logistics costs in Viet Nam by integrating modes of transport in unbroken chain with the seamless process. Research results are collected from surveys and interviews logistics service providers in Ho Chi Minh City, Vietnam, processed by SPSS software.
Abstract: Intermodality has become a major component of the systems approach to business, which is an integral part of what is commonly called “logistics management”. Another benefit of intermodality has been the cooperation between government and private enterprise in reducing unnecessary documentation, enabling goods in transit to keep pace with demand, en...
Show More
-
Research Based on Lee Algorithm and Genetic Algorithm of the Automatic External Pipe Routing of the Aircraft Engine
Issue:
Volume 8, Issue 1, February 2020
Pages:
40-44
Received:
16 January 2020
Accepted:
7 February 2020
Published:
20 February 2020
Abstract: The casing of aeroengine has the characteristics of rotating surface, and more than one hundred pipes are decorated between the casing and outer surface of the nacelle. For the narrow space and various constraints of pipe routing, manual pipe routing is not only labor intensive, but also difficult to ensure the accuracy. To resolve the problem of automatic pipe routing of the aircraft engine, a novel method based on lee algorithm and genetic algorithm is proposed. Firstly, a 3D environment of pipe routing is built and then the initial population for the genetic algorithm is formed by lee algorithm combined with roulette method. Each chromosome of the population represents a possible solution of pipe routing. Secondly, a variable length coding scheme based on chain table is used for chromosome encoding. The genetic manipulation includes selection, crossover and mutation. This paper presents the fitness function based on the constraint condition of pipeline routing. Finally, the useful and feasibility of this method is developed and verified by developing an automatic pipe routing module based on UG and VC.
Abstract: The casing of aeroengine has the characteristics of rotating surface, and more than one hundred pipes are decorated between the casing and outer surface of the nacelle. For the narrow space and various constraints of pipe routing, manual pipe routing is not only labor intensive, but also difficult to ensure the accuracy. To resolve the problem of a...
Show More
