Yangon Technological University

About: Yangon Technological University is a education organization based out in Yangon, Myanmar. It is known for research contribution in the topics: Drainage basin & Fault (power engineering). The organization has 205 authors who have published 185 publications receiving 1071 citations.

Applying Weighted Finite State Transducers and Ripple Down Rules for Myanmar Name Romanization

Abstract: Romanization known as Latinization that refers to the representation of names with Roman (Latin) alphabets. The Romanization process is not trivial especially for Myanmar Language (Burmese) due to different Roman variations of a single Myanmar proper noun. The Myanmar Name Romanization project has so far developed a 55K Romanized word pairs of Myanmar personal names. We apply Weighted Finite State Transducers (WFST) and Ripple Down Rules (RDR) based tagging approaches to the task of Myanmar name Romanization and vice versa. We perform experiments on one closed test data set (5,000 of training data) and three open test data sets: 5,000 Myanmar personal names, 571 city and town names of Myanmar, and 292 Myanmar food names. The result shows that RDR approach gives better performance than WFST for open test data sets.

Characteristics of Concrete Waste Water and Progress of On-Going Treatment

Abstract: The purpose of this study is the examination of the properties of waste water obtained from a ready-mixed concrete plant and its utilization potential as mixing water for concrete production of the batching plant from Great Wall industry, Sagaing Division, Myanmar. The fact that wastewater has detrimental effect on durability of concrete structures is not disputable. Thus durable concrete will retain its original form, quality, and serviceability when exposed to its environment. Samples of waste water from several points of a water recycling process from this ready-mixed concrete plant were examined for their chemical properties (CI; SO 4 2 - , alkalis, total solids, pH) and compared with the specifications applied for concrete mixing water. Also samples of dry sludge powder form the water-recycling process tank were taken and tested for their chemical composition, particle size distribution, and mineralogical composition and thermo gravimetrical results. The water samples were examined for their behavior in concrete specimens with and without admixtures and also for their effect in water demand and setting times in cement pastes. This paper reviews the degradation mechanism of wastewater on ready-mixed concrete structures with a view to finding what needs to be done to salvage these structures. It is obvious that the results of this investigation contribute to the protection of the environment from hazardous waste water disposal and the ready-mixed concrete industry from fresh water costs and any additional cost for buying and conserving an unnecessary complicated water-recycling system.

Integrating the PV-Diesel Hybrid System for Reliability Improvement in Distribution System

Abstract: In Myanmar, as the main power generation is hydro power generation. the utility cannot supply sufficient power to customers during the dry season. Besides interruptions occur frequently due to aging system and lack of prospered protection. Therefore, reliability is an urgent issue in Myanmar. As a result of unbalance between generation and load, the distribution system is getting poor voltage profile, instability and high power losses in high load condition. According to network characteristics, the failure of a component always leads to consequence interruption in a radial distribution system. Therefore, it is a must consideration to mitigate these challenges to enhance the system reliability. There are many techniques to solve the reliability problems such as reclosers, switching devices (manual and automated switches), system reconfiguration, feeder re-conducting and integration of distributed generation (DG). In this paper, system reliability assessment is evaluated in detail with the integration of the distributed generation such as PV-Diesel Hybrid System. The location of DG is chosen according to the expected energy not supply (EENS) and the voltage drop in proposed system. Next, the optimal sizing of DG is chosen depends on the penetration level of generator. Reliability indices can be evaluated depending on the failure rate(λ), repair time(r) and annual outage time(U) in Electrical Transient and Analysis Program (ETAP) software. The case study of this thesis is carried out in 33/11 kV network which is connected Kyatminton Substation, Kyaukse, Middle Myanmar. Keywords: distributed generation, distribution system, EENS, reliability, reliability indices.

Array Antenna System for Wireless Power Transfer (WPT) System at 6.78 MHz

Abstract: This paper proposes an array antenna system for wireless power transfer (WPT) at 6.78GHz. The development of new techniques to increase power transmission and covered area is proposed. The power transmitter with a power output of 22-60 W is designed. Using the principle of magnetic resonance technique, the transmitting array antenna consists of 4 antennas and arranged in the same plane. The in-phase signal feeding technique is selected. Therefore, the electric field spreads around the array transmitting antenna. Measurement results found that the maximum received power of 9.4W. The average value is 3.5W which is sufficiently used to charge the batteries. Charging time depends on the position and received power.

Theoretical investigation of energy saving for vapour compression air conditioning system by using solar thermal energy

Abstract: This paper discusses air conditioning system by using solar thermal energy for performance enhancement and energy efficiency improvement. An evacuated solar collector with hot water storage tank would be installed after the compressor to increase coefficient of performance (COP) of the system at full load. Solar energy and waste energy are fully utilized so less power would be required to run compressor, this is turn allows for smaller compressor to be installed that offer even better savings on power consumption. The proposed system delivers higher system efficiency owing to the higher refrigeration effect in the direct expansion evaporator. According to calculation results, the refrigeration effect of proposed method is increased than that of conventional method. The decreased in mass flow rate is due to increased refrigeration effect and a decrease in compressor work (increased COP). Thus, the novel development is expecting for improvement of energy efficiency, enhancement of the system performance while fulfilling the cooling demand. Consequently, this system can be saved around 40% of electrical energy.