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RSA is the best well — known and the most widely used of public key cryptosystem. The advantage of this algorithm is that the senders who have the public key and the receivers who have private key can communicate each other via the unsecured channel secretly. However, the processes of RSA have to take very great computation cost especially in the decryption process. In this paper, the improving decryption...
Internet of Things (IoT) brings a new paradigm of ‘talking’ sensors or objects with the help of the Internet. Important data from objects are sent for mining or processing purpose into critical information. Internet makes the data vulnerable to the threat of attacks, so some secure ways are needed to secure the data communications process. Restriction access only to certain trustable objects can also...
Offline handwritten signature is still widely used for person verification in financial and business transactions. Most research in offline handwritten signature at-tempts to improve feature extraction and classification for the better recognition rate. The deformation and unsteadiness of handwritten signatures, such as direction, declination, and size, are also the key factors sensitive to recognition...
Circular Extreme learning machine (C-ELM) is the one extended Extreme Learning Machine (ELM). It has the same structure as ELM and Circular Back Propagation (CBP) to make it can mapping both linear and circular decision boundaries. The activation function is the one main point to define the decided boundaries. Many activation functions have been proposed. This paper proposes q-Gaussian activation...
Breast cancer is one of the main causes of women mortality worldwide. Ultrasonography (USG) is other modalities than mammography that capable to support radiologists in diagnosing breast cancer. However, the diagnosis may come with different interpretation depending on the radiologists experience. Therefore, Computer-Aided Diagnosis (CAD) is developed as a tool for radiologist's second opinion. CAD...
Electrical capacitance tomography (ECT) is one of imaging technique based on permittivity distribution of object inside the sensor. The principle of ECT is injection of square or sine wave signal with a certain frequency. In this paper, excitation frequencies of ECT system are analyzed in term of accuracy and system's performance. The frequency excitation will be scanned from 10 to 1500 kHz with 10...
In this paper, we propose a time-series comfort evaluation system for streetscape by using electroencephalogram (EEG). Since streetscapes have an impact on people's psychological condition on a daily basis, a streetscape evaluation system is required for streetscape improvement. In conventional ways, questionnaires have been mainly used to evaluate characteristics of the streetscapes. However, they...
The purpose in this study is visualizing brain functional activities during taking a favorite food using Near Infra-Red Spectroscopy (NIRS). Many appointments and systems that aim to provide happiness for improving quality of life in the users have been constructed. The creations must integrate a common and plausible happiness indicator into their module; however, almost all of them do not have the...
LED driver has the potential to interfere the system of electronic devices if the voltage and current change rapidly. Several previous studies presented various solutions to overcome this problem such as particular converter design, component design, electromagnetic interference (EMI) filters, and spread-spectrum techniques. Compared to other solutions, the spread-spectrum technique is the most potential...
Additional intermittent PV generation and variability load profiles can cause problems in voltage regulation of power systems. Nowadays, PV does not participate in the system voltage control; it can cause a voltage increase or decrease and cause voltage fluctuation disturbance along the feeder. However, the situation can be different if PV participated in voltage control. This paper proposes an approach...
This research presents a new design of modified electrical controller structure of DFIG-based Wind Power Plant for transient stability analysis. In order to perform the transient stability analysis, the system is perturbed by a six-cycles three-phase transmission line fault. This new design consisted of AVR-PSS controller instead of using multistage PI controller in rotor field d-axis. The results...
Economic dispatch determines the optimal power generation output to meet the system load at the lowest possible cost. Characteristics of each generating unit may have an impact on the effectivity of the method used in solving economic dispatch problem. Conventional gradient-based methods are inapplicable in economic dispatch problem with non-smooth cost functions and multiple fuel options. In this...
The aims of this paper is to study and to compare the performance of the three most likely popular PLL strategies that could be found in renewable on-grid power generation control systems: SRF-PLL, DSRF-PLL and DSOGI-PLL. In the on-grid power generation, The PLL has responsibility to acquire grid phase angle and positive-negative sequence components of the grid voltage vector which are required for...
Distributed generation (DG) is a distributed generator that employs on the distribution system. The aims of DG in distribution system are to improve the voltage profile, to increase spare capacity, and to reduce the power losses. DG installation on the distribution system needs consideration of optimal capacity and optimal placement. If DG has placed in incorrect location so it can damage and interference...
Driving a high current-high power brushless direct current (BLDC) motor is not as simple as driving smaller one. Simple block commutated control will not adequate due to interaction of high current and parasitic components. The high current aspect requires careful consideration not only in components selection and printed circuit board design but also in control scheme. This paper will show the effect...
This paper aimed to find out a model of 1 kWp flat-quasi linear permanent magnet generator (LPMG) for ocean wave power plant in South Java Ocean. First, a flat-quasi LPMG is modeled based on the wave characteristic at the placement site. The model was then simulated using finite element software of FEMM 4.2. Next, the model was optimized to find out the optimum output power and cogging force. The...
Renewable energy becomes popular lately. It could make the better environment, especially for sea waves that could utilized 2% of world energy demand. Linear generator is one of the alternative method in energy harvesting, especially sea wave. Direct drive linear generator has some topologies, such as single stator — dual translator, and dual stator — single translator. The proposed design were 2...
Knowledge organizer is a medium to organize the objects of knowledge. The organizer that use semantic representations provide an advantage, because it can be understood by the computing machinery. The organized objects as resources to increase knowledge should be able shared through such as Learning Management System (LMS) which generally use a SCORM (Shareable Content Object Reference Model) as standard...
Flow state, as a psychological experience is one of important aspects in a learning environment. Involving a psychological experience as a context in a context aware personalized e-learning becomes very important. It is due to that engagement and interest in a learning process are determined by its psychological conditions. However, development of a model personalized context aware e-learning by considering...
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