The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper, digital image analysis is applied for non-destructive classification of rice and sticky rice seeds that are mixed together. It is a difficult task because of the similar surface color of the seeds. This paper presents an automatic classification method based on RGB color features. Hardware of image capturing is designed using back light source in order to maximize the contrast between...
Diabetic Retinopathy is a medical condition where the retina is damaged because fluid leaks from blood vessels into the retina. The presence of hemorrhages in the retina is the earliest symptom of diabetic retinopathy. The number and shape of hemorrhages is used to indicate the severity of the disease. Early automated hemorrhage detection can help reduce the incidence of blindness. In this paper we...
A transcription of each word can either be produced by rules, statistical models, or retrieved from dictionary. However, the lack of standards and the variation of how a Thai person romanizes his or her name pose transcription a challenging task. Although the dictionary-based approach seems to produce the most accurate result, a letter-to-sound conversion module is necessary for unknown names. We...
This paper presents compact structure of the ladder-based upon fully-differential Log-companding filter in [14]. The proposed filter structure is based on the exponential-state-space integrators with compatible input and output voltage levels. Based upon the proposed structure, the derivation of the all NPN-only 3rd-order fully-differential Log-companding Chebyshev low-pass filter is demonstrated...
In this paper, we propose an indoor localization system using radio frequency identification (RFID) technology. Locations of passive RFID tags are determined by scanning multiple RFID reader antennas' radiation beams. During each scan, the horizontal and elevation angles of the reader antenna are recorded when the transition of a tag entering or leaving the antenna beam's coverage area occurs, and...
In this paper, we present a real-time PID controller tuning technique via unfalsified control. The algorithm consists of 1. Switching of an active controller in a set of candidate controllers and 2. Optimization of the controller set. A key point of this work is at how to compute a fictitious error signal that reliably detects instability of a non-active controller. Simulation results are demonstrated...
Contour-based background subtraction algorithms are always focusing on the edge of objects in the scene. Most of them may fail when an initial contour is accidentally located inside the foreground object. From the fact that background and foreground image are usually independent to each other, we introduce a contour-based background subtraction algorithm which minimize the dependency between them...
Listening to a lecture in a classroom is a common process for studying in Thailand. Ability of learning is affected by the ability of hearing the instructors' speech. Acoustical environments of the classroom, hence, can influence speech intelligibility. In this research, acoustical parameters, reverberation time, listeners' locations in classrooms and their effects were studied. By using an assumption...
Time series motif discovery is an increasingly popular research area in time series mining whose main objective is to search for interesting patterns or motifs. A motif is a pair of time series subsequences, or two subsequences whose shapes are very similar to each other. Typical motif discovery algorithm requires a predefined motif length as its parameter. Discovering motif with arbitrary lengths...
In this paper, we present the analysis of the parameters that related to fusion splicing loss of SMF-28 and MP980 optical fiber such as axial misalignment (d) and angular misalignment (θ). Here, the Matching mode field and Phase-front transformer model are used to determine their relationships. We study the effect of d and θ on the fusion splicing loss. It is found that, the increasing of d value...
In this paper presents an algorithm for directional over-current relay coordination based on linear programming. The relays are configured by adjusting time dial setting (TDS) of function properly in normal and fault conditions. The TDS adjustment is performed by using linear programming. For test, 6-bus and 9-bus test power systems are situated. Furthermore, there are also identified primary relay...
In this paper, the study of optimal coordination of directional over-current relays is proposed. The relay coordination problem is non-linear. It typically consists of two groups of control variables (Time Dial Setting: TDS and Plug Setting: PS). The objective function used is the operation time of the main relay in all considered fault cases. The differential evolution (DE) is employed to solve for...
This paper proposes a reduced network equivalence in order to fasten the computation of short-circuit currents only within the sub-area of interest, connected to the large power system. The proposed method has been verified on the modified IEEE 24-bus reliability test system and the modified EGAT 243-transmission system. The numerical results evidently show that this method gives acceptable estimates...
This paper presents a 0.5 V quasi-floating gate self-cascode DTMOS current-mode precision full-wave rectifiers (PFWR). The circuit is designed based on improved Wilson current mirrors. All MOS transistors are biased on the edge of conduction, enabling the circuit to operate at low voltage with low power consumption. Negative feedback mechanism of the Wilson current mirror and cross coupling techniques...
The received signal strength (RSS) based localization algorithm is proposed in this paper. Here, the RSSs from neighboring sensors are assumed to be statistically dependent. The Markov random field model is employed to explain this dependency. From the model, the optimum sensor locations are obtained from the maximum likelihood estimate. Our experiment has shown that our proposed algorithm can improve...
This paper presents the method to evaluate the reliability and interrupted energy rate for the high reliable electrical system. The evaluated system is the petrochemical plant system designed based on Tier classification that is a criterion to address a reliability level of electrical and mechanical infrastructure of the data center. This paper modifies the system to the different infrastructure for...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.