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Vision Inspection Methods for Uniformity Enhancement in Long-Length 2G HTS Wire Production
Jae-Hun Lee,Byoung-Jean Mean,Tae-Jin Kim,Young-Soon Kim,Kyekun Cheon,Taehoon Kim,Dae-Gwan Park,Dae-Won Song,Ho-Kyum Kim,Woosuk Chung,Hunju Lee,Seung-Hyun Moon Institute of Electrical and Electronics Engineers 2014 IEEE transactions on applied superconductivity Vol.24 No.5
<P>With much effort devoted by many research groups, the performance of 2nd generation (2G) superconducting wires, also called coated conductors (CC), was drastically improved, leading to many meaningful and impressive demonstrations of electric power devices. Now that the performances such as critical current, in-field characteristics, and mechanical strengths became sufficient to the application, the attention has moved to how we can produce long 2G wires with high uniformity. Many in-line inspection tools are tested and introduced to address these challenges. In this paper, we describe two methods that we adopted for in-line monitoring and feedback control of layer deposition. One is for texture control of ion beam assisted deposition (IBAD) of an MgO layer through reflection high-energy electron diffraction (RHEED) pattern monitoring and analysis. The other is for composition control of a superconducting layer through surface color observation and control of metal source evaporation rates. By applying the above two methods, we achieved in-plane texture of about 4.8 ° in the MgO layer, as measured by FWHM of phi-scan of (220) peak, and the critical current of 750 A/12 mm width in the GdBCO layer along the length of more than 650 m, with excellent uniformity.</P>
<tex> $C\!\!-\!\!Lock$</tex> : Energy Efficient Synchronization for Embedded Multicore Systems
Seung Hun Kim,Sang Hyong Lee,Minje Jun,Byunghoon Lee,Won Woo Ro,Eui-Young Chung,Gaudiot, Jean-Luc IEEE 2014 IEEE Transactions on Computers Vol.63 No.8
<P>Data synchronization among multiple cores has been one of the critical issues which must be resolved in order to optimize the parallelism of multicore architectures. Data synchronization schemes can be classified as lock-based methods (“pessimistic”) and lock-free methods (“optimistic”). However, none of these methods consider the nature of embedded systems which have demanding and sometimes conflicting requirements not only for high performance, but also for low power consumption. As an answer to these problems, we propose C-Lock, an energy- and performance-efficient data synchronization method for multicore embedded systems. C-Lock achieves balanced energy- and performance-efficiency by combining the advantages of lock-based methods and transactional memory (TM) approaches; in C-Lock, the core is blocked only when true conflicts exist (advantage of TM), while avoiding roll-back operations which can cause huge overhead with regard to both performance and energy (this is an advantage of locks). Also, in order to save more energy, C-Lock disables the clocks of the cores which are blocked for the access to the shared data until the shared data become available. We compared our C-Lock approach against traditional locks and transactional memory systems and found that C-Lock can reduce the energy-delay product by up to 1.94 times and 13.78 times compared to the baseline and TM, respectively.</P>
A study on the expansibility of sound-responsive visual art contents
Jiang, Qianqian,Chung, Jean-Hun The Institute of Internet 2022 International journal of advanced smart convergenc Vol.11 No.2
The relationship between sound and vision was experimentally confirmed by physicist Ernst Florens Friedrich Chladni as early as the 18th century and formally entered into systematic research. With the development of emerging media technology, sound reactive type visual content is not limited to a single visual interaction based on the vibration of sound, and its visual content shows a diversified and scalable development trend according to different purposes in many fields. This study analyzes the development and changes of sound visual art contents from early stage to modernization, and analyzes the development characteristic of sound visual art content in different fields and scene environments influence by interactive media, new media technologies and devices by means of case analysis. Through this research, it is expected that the sound reactive type visual art content can continue to develop and extend in the existing fields, while explore the scalability of the application of sound reactive type visual art content in more fields.