Jo Mar 30, 2022
A supporting system for teaching and learning developed by a research team led by Han Pun Hui, a lecturer of logic, is a superior system that makes a favorable environment for the students to have high enthusiasm for study and grasp the heart of the problem actively and positively, so that it could enhance their creative thinking and applicative abilities.
This system presents dynamic and static images along with main thinking questions so students can get the main point of the lessons easily and clearly, and leads their discussion on a scientific basis and at the same time evaluates it real-time quantitatively.
The system, first of all, suggests main thinking questions that require highly vivid imagination as a preparation task.
The thinking questions should include those related to not only the principles of logic but also basic subjects such as mathematics, physics and social subjects so that they can promote the practicality of teaching.
Secondly, it helps students grasp the heart of a problem and enquire into new principles on their own initiatives by leading their discussion and debate on the main question through a bilateral communication network. In the bilateral communication network, it simultaneously receives students’ different answers on the thinking questions, and through the interface, it sets logical relations like deductive, inductive and analogic so that it could raise cognitive effectiveness to the maximum. Through this studying process, students not only can take the initiative in understanding the main point of the lecture but at the same time can possess ability to put logic knowledge into practice.
Furthermore, they can develop a creative thinking ability to find out new principles related to a defining method and its rules voluntarily.
In this way, the system can help students learn a lot more without any limitation of time and quantity and enhance their cognitive effectiveness by presenting thinking questions with dynamic images and receiving and evaluating their answers.
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Jo Mar 25, 2022
When mining penetrates increasingly deeper in open pit mines, the mines take some kind of funnel shape. The deeper the funnel is, the greater the expense for transport gets. In order to accelerate and cheapen transport while maintaining the flexibility offered by truck transport, several types of Trucklift systems have been employed.
These systems are generally similar in structure and operating principle and consist of a slope hoisting plant, platforms, tracks and loading stations. Friction winders or drum winders are used as a hoisting machine and the system can be equipped with either single or double tracks.
When a truck is driven onto and off the platform vertically to the transport direction at the loading station, the platform moves on the rails by the weight of the truck although the winder comes to a halt. Then the truck changing might fail because there may be a difference in the height between the platform and the loading station. So platform arrestors that work when the platform reaches are provided at loading stations, ensuring that the platform is held in the position when the load changes by truck changing.
In addition, when the truck is driven in parallel with the transport direction, the platform also moves on the rails and there appears the varying clearance between the platform and the edge of the loading station. Truck changing may be hindered by this clearance. However, the moving direction of the truck and the platform are the same, so we can avoid the effect of the movement of platforms during truck changing without the help of arrestors by a reasonable design of the structure of loading stations and platforms. For this reason, it is necessary to make a deep study of the moving process of the platform during truck changing.
The moving process of the platform can be simulated with ADAMS and MATLAB/Simulink.
Especially, the simulation of the truck changing process in the Trucklift slope hoisting system where trucks stand parallel to the transport direction on the platform and the analysis of the movement of the platform and the force of rope can provide us with important data for the design of a platform, a loading station and an arrestor.
According to the simulation results, in the Trucklift slope hoisting system with a drum winder, normal truck changing can be realized by making a reasonable design of the platform and the loading station after determining the moving displacement of the platform,
In the Trucklift slope hoisting system with a friction winder, the need to arrange arresters at loading stations must be examined to avoid slipping of ropes in the drum groove due to the movement of the platform during truck changing. If arresters have to be provided at loading stations, the force acting on the platform obtained from the simulation can be used as reference data for the design of arresters.
You can find more information about this in the paper “Simulation for Motion of Platform During Truck Changing in Trucklift Slope Hoisting System in Open Pit Mines Using ADAMS and Matlab/Simulink” by Han Tok Hyong, an institute head at the Faculty of Mining Engineering, presented to the SCI Journal “Arch. Min. Sci.”.
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Jo Mar 24, 2022
Any application including ecological environment monitoring, target tracking, traffic control and agriculture surveillance needs a routing technique for forwarding data sensed by sensor nodes to the base station (BS) or the monitoring centre through several relay nodes.
In topology such as tree or mesh structures used in many applications, sensor nodes are often distributed randomly in areas beyond the reach of people. However, in a one-dimensional queue WSN, nodes are uniformly and densely deployed on a line and this type of network offers many applications such as ecological environment monitoring system along a river, fire monitoring and controlling system along a corridor, smart traffic monitoring system along a road, a tunnel or a bridge, and petroleum pipeline remote monitoring system. In such a one-dimensional queue WSN, the geographical location of each node is fixed, the distance between two neighboring nodes is always uniform, and sensed data can only be forwarded in one direction to the BS. Because of this, the network becomes more unreliable and has high probability that it may be partitioned if some continuous nodes have run out of their energy. Therefore, it should be a key factor of designing a routing protocol in one-dimensional WSNs to ensure energy efficiency and sensed data relay latency by balancing and optimizing energy consumption.
Existing routing protocols in WSNs including a one-dimensional queue WSN attempt to find the path of minimum energy consumption from the source node to the BS to achieve optimal energy consumption because transmitting data consumes much more energy than collecting data.
In one-dimensional queue WSNs, the network topology is linear, so the identification of each node is unique and continuous and the geographical position is certain. From such characteristics, the application of an algorithm that includes a sleep mode in the routing design through timeslot allocation could prolong the network lifetime by ensuring energy efficiency and also satisfy the requirement of sensed data relay latency considering the interference between nodes in some degrees.
This is a distributed energy-efficient opportunistic routing algorithm accompanied by timeslot allocation (DEEOR-TA) using specific network topology of a one-dimensional queue wireless sensor network.
DEEOR-TA algorithm is run in several rounds and each round involves two phases, i.e. clustering-based routing tree construction accompanied by timeslot allocation and data transmission.
Four measurable metrics are defined to evaluate the performance of DEEOR-TA in a one-dimensional queue WSN, i.e. average of residual energy, variation of residual energy, number of dead nodes, and network lifetime.
The simulation results show that the proposed protocol supports better energy efficiency than other existing protocols, and therefore, it can help to prolong the network lifetime.
This paper titled “A distributed energy-efficient opportunistic routing accompanied by timeslot allocation in wireless sensor networks” presented by Ri Man Gun, an institute head at the Faculty of Communication, is carried in the SCI Journal “International Journal of Distributed Sensor Networks”.
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Jo Mar 22, 2022
Choe Song Bom, a section head at the Faculty of Information Science and Technology, has developed an image processor to obtain input images from hand-based shoe design images, and on the basis of it, he has continued to invent a new method of serial expansion and realize it in a serial expansion program.
This program consists of 3 parts: noise reduction, contour highlight, and serial expansion.
Its application reduced design hours from 10 to 3 and improved design accuracy from 90% to 98%.
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Jo Mar 21, 2022
In keeping with the actual conditions where communication equipment is on the increase in its kind and scale, the research team led by An Chong Il, a researcher at the Faculty of Information Science and Technology, has developed a network management system using a simple network management protocol that enables the integrated management of individual pieces of communication equipment.
Thanks to it, it became possible to manage different pieces of existing communication equipment in an integrated way and also to satisfactorily supervise and manage newly-added ones.
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Jo Mar 18, 2022
The research group led by Sim Jae Rim, a section head at the Faculty of Materials Science and Technology has succeeded in the research into an effective method of debinding in metal injection molding (MIM) products.
They put MIM products made with paraffin-based binder in a benzol-acetone solution to remove soluble binder before heating them to remove insoluble binder, thus increasing debinding rate by more than 5% and reducing the duration of debinding by more than 2 hours.
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