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This paper proposes a dual-loop voltage control for optocoupler feedback in capacitive output filter converter to mitigate the detrimental effect of the optocoupler on regulation performance. The dual-loop consists of primary-side regulation (PSR) loop and reference voltage correction loop. PSR loop performs output voltage regulation with indirectly sensed output voltage across tertiary winding of...
This paper proposes a power management strategy of multiple energy storages system for DC microgrid. A static power flow regulation between batteries is accomplished by adopting adaptive droop offset voltage. By addition of offset voltage proportional to state-of-charge (SOC) error, the battery with higher SOC provides more load power while the one with lower SOC provides less. In addition, the dynamic...
This paper proposes gain-scheduled control using voltage controlled oscillator with variable gain for a LLC resonant converter to improve the dynamic performance. Considering the effect of switching frequency to the gain function of a LLC resonant converter, control loop gain is scheduled by voltage controlled oscillator with a frequency-dependent gain. The effective gain function for VCO is proposed,...
This paper proposes an improved modulated carrier control for single-phase shunt active power filter, which eliminates harmonic and reactive currents at ac sources drawn by nonlinear loads. This control method directly shapes line current to be sinusoidal and in phase with grid voltage by comparing a modulated carrier signal to the average line current and making duty ratio doubled. Since the line...
A service robot system contains several functions to provide one task. Each function plays a different role in the service for the same purpose. Also, tasks in robot can keep changed with various connections of functions. In this paper, we discuss the method that propagates functional information in order to implement a target task, especially for a user recognition task.
This paper proposes a new modulated carrier control for an interleaved continuous conduction mode (CCM) power factor correction (PFC) boost converter. The proposed method allows precise sinusoidal input current shaping for a PFC boost converter operating in CCM. This is accomplished by simply comparing the modulated carrier signal with the switch current sensing signal such that the inner loop current...
In this paper, a simple load current feed-forward control method to enhance the load transient response is proposed. Different from the conventional load current feed-forward control method, the proposed method calculates load current variation from the output voltage rather than directly measuring load current which requires a current sensor, such as a Hall-effect sensor. The proposed method requires...
This paper presents a method to estimate a driver's drowsiness and distraction using audio and video information. Drowsiness can be detected by eye movement and mouth movement. A driver's distraction can be estimated by a driver's voice detection using beamforming method and mouth movement.
This paper presents an object recognition method; feature X-D such as Kanade- Lucas-Tomasi Feature (KLT)-D and Speeded-Up Robust Features (SURF)-D. The main idea of the proposed algorithm is to use distance method to achieve rotation and position invariance. The anchor point, a center point of the target boundary region, is proposed in this paper as the basis of the pose estimation and it can be obtained...
This paper presents a user recognition system, using face, height, and clothes color features under the special assumption that is a user is monitored and tracked. In real human-robot interaction situation, all information cannot be provided at the same time and some parts of frames in a video have no clues at all. In the proposed system, tracking is an important feature to recognize a user because...
This paper presents a wireless network-based voice component framework for human-robot interactions. There are many voice-related applications such as source localization, speech recognition, and speaker recognition. The proposed system is wireless network system and integrates each of voice-related robot application by a well-organized manner in order to maximize the efficiency of voice-based utilities...
This paper presents a miniature condenser microphone with a flexure hinge diaphragm for portable terminals applications. MEMS technology has been successfully applied to miniature silicon capacitive microphones, and we fabricated the smallest condenser silicon microphone in the presented reports. We used the finite-element analysis (FEA) to evaluate mechanical and acoustic performances of the condenser...
User recognition is one of the most fundamental functionalities for intelligent service robots. However, in robot applications, the conditions are far severer compared to the traditional biometric security systems. The robots should be able to recognize users non-intrusively, which confines the available biometric features to face and voice. Also, the robots are expected to recognize users from relatively...
This paper describes a method to recognize the age and gender of a user on the basis of human speech. Using voice source characteristics of the Mel frequency cepstral coefficients (MFCCs), a Gaussian mixture model (GMM) technique is applied in an effort to discover the age, gender, and other information as regards a user. On the basis of this information, service applications for robots can satisfy...
A 512Mb diode-switch PRAM is developed in a 90nm CMOS technology. A core configuration, read/write circuit techniques, and a charge-pump system for the diode-switch PRAM are described. Through these schemes, the PRAM achieves read throughput of 266MB/S and maximum write throughput of 4.64MB/S with a 1.8V supply.
Most existing gesture detection and tracking algorithms construct fixed postures that make search regions narrower. Under robot circumstances, however, it is unreasonable to makes users stick to a certain pose. In this paper we suggest a particular motion that help to detect and tracking hands easier under robot circumstances. The requirements of such motion are mainly three; first, the motion can...
This video is concerned with a scenario for developing speech-based Human-Robot Interaction (sHRI) components for Ubiquitous Robot Companion (URC) Intelligent Service Robots as one of the next-generation growth engine industries in Korea. Here the URC means that it will provide the necessary services at any time and place to meet the user's requirements. Thus, it combines the network function with...
This paper proposes a novel real-time robust hand tracking algorithm, integrating multi-cues, and a limb's degree of freedom. For this purpose, we construct a limb model and maintain the model obtained from KLT-AR methods with respect to second-order auto-regression model and Kanade-Lucas-Tomasi (KLT) features, respectively. Furthermore, this method provides directivity of a target, enabling us to...
A 256Mb PRAM featuring synchronous burst read operation is developed. Using a charge-pump system, write performance is characterized at 1.8V supply. Measured initial read access time and burst-read access time are 62ns and 10ns, respectively. The maximum write throughput is 3.3MB/S
A 1.8 V 64 Mb phase-change RAM with improved write performance is fabricated in a 0.12 /spl mu/m CMOS technology. The improvement of RESET and SET distributions is based on cell current regulation and multiple step-down pulse generators. The read access time and SET-write time are 68 ns and 180 ns respectively.
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