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Analytical Hierarchy Process Method Based Analysis on Road Safety Inspection at Metu - Yayo Road Segment
Dawit Ayenachew,
Sinshaw Sahile,
Garomsa Fikadu
Issue:
Volume 7, Issue 1, March 2021
Pages:
1-11
Received:
25 December 2020
Accepted:
14 January 2021
Published:
22 January 2021
Abstract: Now days road safety becomes a worldwide concern. Similarly Road safety risk has been a major issue in the study area (Metu- Yayo road segment). The successful assessments of road safety inspection within the study area are very essential to minimize future road accidents faced by the entire road user. The study were started by examining the current condition of the road using road safety inspection manual then it used focus group judgments and it is analyzed by analytical hierarchical process method based pairwise comparison in identification of contributing factors for the road safety risk using two levels of Analytical Hierarchical process, and four major factors i.e. pavement surface condition, road geometry condition, road side environment condition, road traffic control condition, and also it tries to prioritize the road section to identify the road with better facilities and the road in the worst condition. During road safety inspection in the study area the road experience early stages of pavement distresses, road traffic sign related problems, sight distance obstruction, and soil slide related problems this in turn speeds up the road safety risk and increases the occurrence of road traffic accidents. As a result, this study concluded, road traffic control factors were the most significant factors which contributes to the occurrences of road safety risk. In comparison, Lakosaya to Yayo road section is the found in a better condition, but the road section from Mechi to Lakosaya is found in worse condition in the study area.
Abstract: Now days road safety becomes a worldwide concern. Similarly Road safety risk has been a major issue in the study area (Metu- Yayo road segment). The successful assessments of road safety inspection within the study area are very essential to minimize future road accidents faced by the entire road user. The study were started by examining the curren...
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Simulated Training System of Ship Anchoring Operation Based on Virtual Reality Technology
Hejun Geng,
Baowei Wang,
Deling Wang,
Xiaobin Jiang
Issue:
Volume 7, Issue 1, March 2021
Pages:
12-18
Received:
6 March 2021
Accepted:
17 March 2021
Published:
26 March 2021
Abstract: Seldom can trainees be allowed to practice anchoring in current teaching and training for crew. It is quite dangerous, difficult and costly to train and teach the trainees of anchoring operation by using real anchoring equipment. The practical operation teaching and training of ship mooring maneuvers is. In order to improve the training efficiency and save the training cost, an idea of anchoring simulation based on the virtual reality technology has emerged. According to our research on the problems existing in the research and development of the simulation training system for ship anchoring operation. The 3D modeling technology is used to build 3D models of anchoring equipment such as windlass and anchor chains, and the 3D visualization and interactive operation of virtual scene of ships are realized by using Unity 3D engine design. Use inverse dynamics method for virtual human action simulation and A* path finding algorithm for path planning is proposed in the paper, as well as a position-based dynamics (PBD) method to solve the problems of low simulation efficiency and fidelity in the simulation of anchor chains. Besides, a bounding box technology and a continuous collision detection method are employed, respectively, to detect collisions between different objects in a scene. Through the simulation system to carry out practical training for crew, the simulation system can meet the training requirements of ship anchoring.
Abstract: Seldom can trainees be allowed to practice anchoring in current teaching and training for crew. It is quite dangerous, difficult and costly to train and teach the trainees of anchoring operation by using real anchoring equipment. The practical operation teaching and training of ship mooring maneuvers is. In order to improve the training efficiency ...
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Evaluation of Applying Various High Voltage Levels to Improve Fuel Injector Response Time on Gasoline Engines
Phan Nguyen Qui Tam,
Do Van Dung,
Dinh Cao Tri
Issue:
Volume 7, Issue 1, March 2021
Pages:
19-23
Received:
7 November 2020
Accepted:
27 February 2021
Published:
26 March 2021
Abstract: This paper presents the effect of various high applied voltage levels on the responsiveness of fuel injectors on gasoline engines. During operation, the inductance in the injector changes at a certain value because of the change of magnetic permeability, which is the result of the needle lifting process, directly affects the curve of the current in the needle. On the other side, the amperage in the injector is hampered by another amperage produced by the phenomenon of self-inductance, leading the current in the injector increase slowly resulting in the needle lifting will be delayed. Normally, there are two ways to increase the response time that including the improvement of fuel injector shape and injection control method. But in this paper, to improve the response time without changing either the structure or the control method of the injector, the authors conduct research on increasing the operating voltage level in order to reduce the dead time of the needle. In particular, a mathematical description of the fuel injector amperage will be built based on two different inductance values, then some experiments are practiced to evaluate the response time of the fuel injector. Experimental results in the range of 12V to 30V indicated that the sensitivity of the injector was significantly improved.
Abstract: This paper presents the effect of various high applied voltage levels on the responsiveness of fuel injectors on gasoline engines. During operation, the inductance in the injector changes at a certain value because of the change of magnetic permeability, which is the result of the needle lifting process, directly affects the curve of the current in...
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Review on Urban Transportation System and Its Adverse Impacts to Public Health of the Cities
Vo Minh Phuc,
Vo Trong Cang
Issue:
Volume 7, Issue 1, March 2021
Pages:
24-28
Received:
26 September 2020
Accepted:
21 November 2020
Published:
26 March 2021
Abstract: The main research objective is creating the knowledgebase on transport and urban development and their adverse impacts to public health of big cities’ citizen. This research is a flatform from which future studies could be conducted with the purposes to improve urbanization and health-related issues toward healthy cities and sustainable urban development. The literature review research method is applied throughout the study process to review and summarize on: (1) the legal documents on urban planning and development, including transportation, environmental related-aspects; (2) scientific studies on urban planning and development, urban planning - transport - public health relationship, public health contribution to sustainable development, and (3) news and articles from media, newspaper about the current situation of urban planning, traffic, health issues and changes in related policies, etc. Main findings of the study: (1) listing out the major negative health effects related to transport and urban planning, such as: injuries and accidents are main causes leading to urban mortality (especially in Asia) and illness realated to pollutants releasing from traffic activities; and (2) introduction some public health improvement applying planning-related measures: Healthy Cities Program (HCP) and Healthy Urban Planning (HUP) by WHO, KonSULT’s policy measures analysis in term of Health effects.
Abstract: The main research objective is creating the knowledgebase on transport and urban development and their adverse impacts to public health of big cities’ citizen. This research is a flatform from which future studies could be conducted with the purposes to improve urbanization and health-related issues toward healthy cities and sustainable urban devel...
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Comparative Evaluation of California Bearing Ratio (CBR) of Natural Offshore Sand and Cement Stabilized Offshore Sand as Road Subbase Material in Swampy Region
Fidelis Onyebuchi Okafor,
Owo Awajigbana Tugwell
Issue:
Volume 7, Issue 1, March 2021
Pages:
29-32
Received:
13 March 2021
Accepted:
25 March 2021
Published:
1 April 2021
Abstract: This investigation focused on the comparative evaluation of California Bearing Ratio values of natural offshore sand and cement stabilized offshore sand as subbase materials for road construction in swampy regions. CBR tests were carried out on the offshore sand sample to ascertain its suitability for road subbase filling. Based on the test results, the CBR of the natural offshore sand was found to be 4.05 percent. After 4% Cement stabilization, the value increased to 12 percent. At 6% cement stabilization, the CBR increased to 26 percent. At 8% cement content, the value obtained was 27 percent. At 10% cement content, the CBR results increased to 31.7 percent. After 12% cement content, the CBR values obtained became 61.4 percent. For sand to be used as subbase material, the Federal Ministry of Works and Housing, Abuja (1997) recommends that the Minimum CBR for subbase should be 30 percent. It is seen that CBR values of natural offshore sand, and at 4% - 8% cement contents did not satisfy requirement for use as subbase material. However, at 10% and 12% cement contents, CBR values of 37.9 percent and 61.4 percent obtained respectively met CBR requirement for subbase. This investigation concludes that cement can be used to stabilize offshore sand to improve the performance of its engineering properties for use as subbase material for construction of road in swampy regions.
Abstract: This investigation focused on the comparative evaluation of California Bearing Ratio values of natural offshore sand and cement stabilized offshore sand as subbase materials for road construction in swampy regions. CBR tests were carried out on the offshore sand sample to ascertain its suitability for road subbase filling. Based on the test results...
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