University of the Thai Chamber of Commerce

About: University of the Thai Chamber of Commerce is a education organization based out in Bangkok, Thailand. It is known for research contribution in the topics: Corporate social responsibility & General equilibrium theory. The organization has 223 authors who have published 422 publications receiving 5380 citations.

Utilizing Ontologies Using Ontology Editor for Creating Initial Unified Modeling Language (UML)Object Model

Abstract: One of object oriented software developing problem is the difficulty of searching the appropriate and suitable objects for starting the system. In this work, ontologies appear in the part of supporting the object discovering in the initial of object oriented software developing. There are many researches try to demonstrate that there is a great potential between object model and ontologies. Constructing ontology from object model is called ontology engineering can be done; On the other hand, this research is aiming to support the idea of building object model from ontology is also promising and practical. Ontology classes are available online in any specific areas, which can be searched by semantic search engine. There are also many helping tools to do so; one of them which are used in this research is Protege ontology editor and Visual Paradigm. To put them together give a great outcome. This research will be shown how it works efficiently with the real case study by using ontology classes in travel/tourism domain area. It needs to combine classes, properties, and relationships from more than two ontologies in order to generate the object model. In this paper presents a simple methodology framework which explains the process of discovering objects. The results show that this framework has great value while there is possible for expansion. Reusing of existing ontologies offers a much cheaper alternative than building new ones from scratch. More ontologies are becoming available on the web, and online ontologies libraries for storing and indexing ontologies are increasing in number and demand. Semantic and Ontologies search engines have also started to appear, to facilitate search and retrieval of online ontologies.

A low-power high-frequency all-pass-filter-based sinusoidal quadrature oscillator using CMOS current mirrors

Abstract: A low-power high-frequency sinusoidal quadrature oscillator is presented through the use of two all-pass current mirror (CM)-based filters, a 1st-order CM low-pass filter and a CM bilinear transfer function. The bilinear transfer function is described in terms of a negative resistance (R N = -R L ) where R L is a resistor load of a current mirror. The technique is relatively simple based on (i) inherent time constants of current mirrors, i.e. the internal capacitances and the transconductance of a diode-connected NMOS, (ii) a simple negative resistance R N formed by a resistor load R L of a current mirror. Neither external capacitances nor inductances are required. As a particular example, a 1.01-GHz, 0.6-mW, 2-V CMOS all-pass-filter-based all-current-mirror sinusoidal quadrature oscillator is demonstrated in this paper. The oscillation frequency (f 0 ) is 1.01 GHz and is current-tunable over a range of 400 MHz or 40 %. The power consumption is at approximately 0.6 mW. The amplitude matching and the quadrature phase matching are better than 0.05 dB and 0.15°, respectively. Total harmonic distortions (THD) are less than 0.5 %. At 2 MHz offset from the 1.01 GHz, the carrier to noise ratio (CNR) is 83.01 dBc/Hz whilst the figure of merit called a normalized carrier-to-noise ratio (CNR norm ) is 139.29 dBc/Hz. The ratio of the oscillation frequency (f 0 ) to the unity-gain frequency (f T ) of a transistor is 0.134.

A Study for Reducing Energy Consumption in Electronic White Stick Module

Abstract: Recently, there are a number of researchers interested in conducting and developing an electronic white stick, which is the electronic version of the normal white stick for blind people. Concept of inventing this electronic stick is developed from studying mechanism to determine close range or distance between the stick and the obstacles – by means of some electronic sensing devices. Parameters that rate this sticks could be its size, and weight, i.e., its size and weight should be as same as that of the normal white sticks. However, its battery (utilization) time is also important. The battery of the stick should not be last before twelve hours when using it continuously. This paper studies techniques to reduce power consumption in electronic white stick. In addition, several batteries with different discharged rate were employed for determining utilization time. The results show that the proposed module of electronic stick consumed lower energy than the previous work and a NiMHC-size of 2,200 mAh battery is adequate for operating the stick more than twelve hour at any modes of alarming.

Analysis of Excessive Cost of Overlapped Bus Route System in Bangkok

Abstract: Bangkok, as the capital of Thailand, has been drastically growing in economic aspect and population. It has also been ranked as one of the top destinations over the past decades. It therefore attracts more immigrants from the rural areas and tourists from several parts of the world. One of the main drawbacks in Bangkok is public transportation system. Unlike other capitals of the developed and some developing countries, public transportation in Bangkok is not fully organized. Bus transportation is the core of the current system and it is operated by the Bangkok Mass Transit Authority (BMTA). According to the BMTA annual report 2011, it operates 108 bus routes and has been suffered from an accumulated loss of over 5 billion baht (approximately 160 million dollars). Three key causes of such loss include bus routes, policy conflicts and its quality of services. Most of the bus routes managed by BMTA are long and overlapped. There are plenty of buses on the same routes, especially in the city centers. Further, long route decreases the number of operating cycles, generating less income. The BMTA provides transportation services to the public and it also aims for profits. Ticket prices have to be maintained as long as possible in order to minimize the impacts, especially to the low-income. The investment has been temporarily ceased which has crucial effects to its quality of services. The passengers usually have to wait for their buses for an unknown period of time and the buses do not provide acceptable comfort. Therefore, the “BMTA ex-passengers” gave up and arranged to own personal vehicles. The number of private vehicles is increasing and it results in an increased severity of traffic-jam problem in Bangkok. Such effects undoubtedly worsen the BMTA’s crisis. Overlapped bus routes directly affect the BMTA’s operations as they increase the number of vehicles in the traffics and decrease the number of operating cycles. This case presents an analysis of the effects of the overlapped bus route operated by the BMTA. Current situations including operating and financial aspects of the BMTA, together with its plans are provided. A computerized system has been developed to support data input, processing and output – both reports and graphical representations. The bus route is simulated by the graph theory where a node represents main bus stop or junction and an edge represents bus route. The results demonstrate degree of the existing overlaps and their corresponding costs. Further, several feasible policies on bus route adjustments and the feasible corresponding impacts are introduced.