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We demonstrate the capability of controlling the optical anisotropy of lasing emissions by manipulating the coupling between the oscillated electric field and the localized surface plasmon (LSP) resonance for a random lasing medium composed of colloidal CdSe/ZnS quantum dots (QDs) and ellipsoidal silver nanoparticles (Ag NPs). Distinctive from the amplified spontaneous emission (ASE) generally observed...
This paper presents an attitude estimation method used for navigation of an unmanned surface vehicle. The method utilizes measurements by global navigation satellite system (GNSS) as well as microelectromechanical systems-attitude heading reference system (MEMS-AHRS). Since magnetic field measurement by the MEMS-AHRS is vulnerable to internal and external disturbances, the magnetic field measurement...
The paper proposes a diagnostic function to prevent over charging and discharging of the Li-Ion batteries as well as to keep connections with generator and motors of electric vehicles. Both operating conditions normal and abnormal are taken into account in terms of communications. Especially to cope with a situation that communication from the battery side has been cut off, an additional protected...
Machine learning is currently a hot research topic and applied in intelligence transportation system to discover new valuable knowledge and patterns. In this paper, we extract trajectory information from popular traffic simulator and apply it into four different machine learning methods. In the case of the Gangnam district in Seoul, the Gradient Boosting Regression has better fit with lower values...
This paper deals with an analysis of the design parameters and its influence on performance of the linear induction motor (LIM). LIM propels using Lorentz force generated by interaction between magnetic flux of the primary and eddy current induced in secondary. As depending on the size of the primary and the secondary, not only magnetic flux and induced eddy current, but also performances of the LIM...
Color temperature of electroluminescence from white light-emitting electrochemical cells can be adjusted by locally laser-scanned thermal annealing on a semi-continuous thin Ag film embedded between indium tin oxide anode and glass substrate. The proposed technique offers programmable versatility to control white electroluminescence and is compatible with display manufacturing technologies.
As the use of electric energy increases rapidly due to the development of the worldwide industry, The ESS is attracting much attention in terms of efficient energy use. The ESS consists of various components such as battery, BMS, PCS and PMS. And PCS is the largest weight and volume among these components. The reasons are that the reactor for the high-frequency filter and the isolation transformer...
Hacking competitions serve an important role in cybersecurity education, especially in increasing students' learning motivations and practical experiences. A proper feedback can promote students reflective thinking and improve learning performances. It's essential to collect logs for effective portfolio assessment. However, a conventional hacking competition setup is a heterogeneous environment, including...
While a certain sound serves a purpose to someone, for others, the same sound could be noise. Specifically, an alarm sound would be necessary for someone to wake up and start the day, while it would be an unwanted sound for people sharing the same room, who need not wake up as early. Noise cancellation is useful in this scenario, but most existing techniques require costly equipments (e.g., high quality...
Multi-rate forward erasure correction (FEC)-applied wireless multicast enables reliable and efficient video multicast with intelligent selection of physical (PHY) layer data rate and FEC rate. The optimal PHY/FEC rates depend on the cause of the packet losses. However, previous approaches select the PHY/FEC rates by considering only channel errors even when interference is also a major source of packet...
In this study, we investigated the correlation between thermal conductivity and insulative shell thickness of SiO2 coated Ag (SCA) particles for the thermal filler material in the high performance underfill with focus on improved thermal conductivity. We synthesized the coating of various SiO2 insulation layer on the surface of spherical Ag powder and used them for underfill material formulation to...
HILS (Hardware in the loop simulation) is the middle stage of analytical method and evaluation of produce. If this technique can be used well, not only can it noticeably reduce development period and expense, but it has the advantage of being easy to change the parameter of motor and analyze the result because of its high reproducibility.[1] Therefore, the interest toward the development of HILS system...
The air pollution have become a major social problem. The motor is applied to the traction system. The traction motor operates in wide operation range. In this paper, 120kW Concentrated winding IPMSM is presented as existing model. In the high speed, harmonics of the motor becomes large, it becomes a problem in the control side. Therefore, when designing a vehicle electric motor, it is necessary to...
The 21st COP, hosted in Paris, France, in December 2015, selected Paris Agreement that mandated all countries to participate in the global response to climate change. With this, the rail transportation system in Korea is undergoing active research on low-carbon emitting technologies. The current paper designs photovoltaic power generation system using the rooftop of Gwangmyeong Station, the largest...
Recently, medical records are shared to online for a purpose of medical research and expert opinion. There is a problem with sharing the medical records. If someone knows the subject of the record by using various methods, it can result in an invasion of the patient's privacy. De-identification techniques are applicable to address the problem, however, de-identified data has a risk of re-identification...
This paper describes a method for detection of object using 3D point cloud measurement in the sea environment. The method employs RBNN clustering method and using a 3D Lidar, mono-vision and stereo-vision cameras, and radar vision system. A radially based nearest neighbors (RBNN) clustering technique is adopted to perform object detection on 3D point cloud clustering. RBNN is constructing clusters...
Fast data (the next step after big data) revolution leads to new requirements in data processing platforms. To overcome the fast data bottleneck caused by data in extremely rapid transit, adaptive data approximation is one of the alternative ways to handle incredible data speed. In this paper, we present an approximate iterative method for fast data analysis and investigate what benefits and opportunities...
Anticensorship continues to be an arms race between citizens who use circumvention systems and the censors that find and block them. Many recently proposed circumvention systems have found ways to hide from deep-packet inspection (DPI), as well as active probing by the censors. However, many circumvention systems have trouble distributing the necessary resources to its users, and often use centralized...
This paper proposes a new power device combination that can reduce total power loss for a single-phase inverter reduced common-mode noise. In the proposed common mode voltage reduction PWM, to reduce the common-mode voltage of a single-phase inverter, the half bridge connected to the live end of the single-phase commetial power source perform PWM, and the other half bridge connected to the neutral...
In the last decade, many advances have been made in the field of automatic temperature estimation, including wearable sensor technologies (WST), infrared thermography (IRT), and non-contact infrared thermometer (NCIT). In contrast with the WST and IRT, NCIT is inexpensive without the risk of potential skin irritation. Nevertheless, NCIT is limited in short valid estimation distance (<12 cm), resulting...
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