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We present a tunable multiwavelength fiber laser based on nematic liquid crystal device (NLC) for fiber-optic electric field sensor. The lasing multiwavelength could be tuned over 18 nm by applying electric field to the NLC device.
We measure the pitch variation of cholesteric liquid crystals (CLCs) according to the applied electric field using a wavelength-swept laser. While the electric field is applied to the CLC, the pitch of the CLC is elongated normal to the direction of electric field. Therefore, the reflection band is shifted to the longer wavelength. When the applied electric field to the CLC cell was over 1.52 V/μm,...
We report a measurement of effective refractive index of a nematic liquid crystal Fabry-Perot etalon according to the applied static electric field intensity. The effective refractive index decreases from 1.67 to 1.51 as the applied electric field intensity is increased.
We report a dynamic fiber-optic electric field sensor using a nematic liquid crystal (LNC) Fabry-Perot etalon and a wavelength-swept laser (WSL). The WSL has a linear relationship between the wavelength measurement and the time measurement. When a modulated electric field of the proper amplitude and frequency is applied to the NLC, the transmission wavelength peaks for the ordinary mode are maintained,...
Recently, methods that combine the concepts of Dynamic Voltage Scaling (DVS) and Dynamic Power Management (DPM) approaches have been proposed for a single task. This paper proposes Adaptive Power Management System (APMS), which utilizes useful features of both DPM and DVS and an existing pattern analysis algorithm, and new BET-based Task Partition Scheduling (BTPS). In order to determine the optimal...
The existing NAND flash memory file systems have not taken into account multiple NAND flash memories for large-capacity storage. To resolve these problems, this paper suggests a new file system called NAFS for large-capacity storage with multiple small-capacity NAND flash memories. It adopts a new cache policy and mount scheme in order to improve read and write performance and to reduce the mount...
This paper proposes a novel object-based virtual network middleware for supporting the interoperability among home devices and smart grid devices. In order to demonstrate that home devices and smart grid devices are interoperable through the proposed middleware, we implement applications based on the OVNet on a target platform consisting of embedded boards, sensors and laptops for emulation purposes...
A cyber physical systems (CPS) are deeply embedded systems that can be applied to home devices, medical equipments, cars, and etc. Since it is expected that a CPS system will be integrated with other CPSes designed for various areas to ultimately create a global CPS network covering a global network, IPv6 is suitable to these large-scaled integrated network environments. This paper proposes a hierarchical...
This paper suggests various schemes for a file system which is suitable for large-capacity storage with multiple NAND flash memories. The file system can be adopted by multimedia devices which require light non-volatile large storage.
This paper suggests a Break Even Time-based Adaptive Power Management System which partitions a multimedia data stream into a sequence of substreams. APMS shows good performance for multimedia applications which periodically access multimedia files.
This paper proposes an IPv6-based hierarchical middleware architecture for an efficient control of home devices on a global network from anywhere. This architecture can be adopted by mobile and home devices for smart home control.
This paper proposes a novel object-based home network middleware for the interoperability among home devices and smart grid devices. This middleware can be adopted by home devices for energy efficient homes.
Since the existing NAND flash memory file systems manage file data in page units, the memory usage increases greatly as the number and size of files increase, and the area to scan at the mounting time increases linearly as well. To resolve these problems, this paper suggests data management in segment units for more efficient processing of multimedia files to reduce memory usage and to improve reading...
This paper suggests a way to decrease memory usage through data management in segment units for the effective processing of multimedia files. In addition, it suggests a proper indexing structure and garbage collection method for multimedia files to improve performances of mounting and wear leveling.
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