• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.5
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• pp.219-224
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• 2015

Recently, the multi-core processor architecture is widely used in the digital signal processors for enhancing its performance. Multi-core processors are classified either as symmetric or asymmetric. Asymmetric multi-core processors are known to have higher performance and more efficient than symmetric multi-core processors. In order to study the performance enhancement of asymmetric multi-core digital signal processors over the symmetric ones, the trace-driven simulation has been executed for various asymmetric quad-core, octa-core and hexadeca-core digital signal processors and compared with the symmetric ones of similar hardware budget using UTDSP benchmarks as input.

• Journal of the Korean Society for Library and Information Science
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• v.57 no.4
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• pp.119-138
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• 2023

This study endeavors to delineate the essential components of digital preservation policies requisite for data repositories. Drawing from an examination of digital preservation policies from data repositories accredited by CoreTrustSeal in 2023, this study unveils the pivotal components intrinsic to a digital preservation policy framework, subsequently elucidating the content each component encompasses. The proffered framework is anticipated to serve as a foundational reference for institutions aiming to craft their digital preservation policies, transcending the confines of those solely pursuing CoreTrustSeal certification, to encompass both domestic and international institutions irrespective of their intent to seek CoreTrustSeal certification.

• Journal of Information Science Theory and Practice
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• v.2 no.4
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• pp.6-19
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• 2014

The description of preserved resources is one of the requirements in digital preservation. The description is generally created in the format of metadata records, and those records are combined to generate information packages to support the process of digital preservation. However, current strategies or models of digital preservation may not generate information packages in efficient ways. To overcome these problems, this research proposed an internal structure of information packages in digital preservation. In order to construct the internal structure, this research analyzed existing metadata standards and cataloging rules such as Dublin Core, MARC, and FRBR to extract the core elements of resource description. The extracted elements were categorized according to their semantics and functions, which resulted in three categories of core elements. These categories and core elements were manifested by using RDF syntax in order to be substantially applied to combine metadata records in digital preservation. Although the internal structure is not intended to create metadata records, it is expected to provide an alternative approach to enable combining existing metadata records in the context of digital preservation in a more flexible way.

• ETRI Journal
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• v.25 no.5
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• pp.337-344
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• 2003

In this paper, we introduce a fully synthesizable 32-bit embedded microprocessor core called the AE32000B. The AE32000B core is based on the extendable instruction set computer architecture, so it has high code density and a low memory access rate. In order to improve the performance of the core, we developed and adopted various design options, including the load extension register instruction (LERI) folding unit, a high performance multiply and accumulate (MAC) unit, various DSP units, and an efficient coprocessor interface. The instructions per cycle count of the Dhrystone 2.1 benchmark for the designed core is about 0.86. We verified the synthesizability and the area and time performances of our design using two CMOS standard cell libraries: a 0.35-${\mu}m$ library and a 0.18-${\mu}m$ library. With the 0.35-${\mu}m$ library, the core can be synthesized with about 47,000 gates and operate at 70 MHz or higher, while it can be synthesized with about 53,000 gates and operate at 120 MHz or higher with the 0.18-${\mu}m$ library.

• Journal of Korean Society for Quality Management
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• v.49 no.4
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• pp.609-622
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• 2021

Purpose: In recent years, several new attempts have been made to offer products and services based on servitization and customization for comparative advantage and customer satisfaction. Apparently, these attempts are empowered by new digital technologies. Therefore, this study aims to present new business cases with features of digital transformation era in Korea on the perspective of new quality dimensions. Methods: The study approaches the subject by presenting a number of recent business cases in multiple fields in Korea. All cases are analyzed and compared with "10 Quality Dimensions" and several related implications such as servitization, customization, digitalization and differentiated value. Results: The results of this study are as follows; the common core quality dimensions of case are customization, aesthetic and convenience. Furthermore, the critical role of technology is deduced as the core quality dimensions are built on new digital technologies. Lastly, businesses in the age of digital transformation must focus on the core performance of their products and services for customer satisfaction while delivering new core quality dimensions. Conclusion: Recent digital technologies are capable to realize servitization and empower companies to provide differentiated and customized products, services, and experience to their customers. However, it is significant to retain other factors for customer satisfactions rather than customization.

• Proceedings of the KIPE Conference
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• 2002.07a
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• pp.419-422
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• 2002

This paper compares PDM and PWM for single phase switched reluctance motor for vacuum cleaner. Generally, PWM control scheme Is preferred because of small torque ripple compared with PDM control scheme. However, as the motor speed of the vacuum cleaner is above 20,000[rpm], the torque ripple is not problem any more. PDM control scheme is better than PWM control scheme considering loss of power device and EMI.

• The Transactions of the Korea Information Processing Society
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• v.5 no.9
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• pp.2233-2247
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• 1998

With the growth of World Wide Web, multimedia electronic documents have been frequently used in a lot of applications. Especially, digital libraries tliat deal with huge and various multimedia electronic documents need to support efficient searcli techniques and systematical management techniques. In this paper, we suggest an extended Dublin Core metadata to store and search the multimedia electronic documents managed at digital libraries. We also design a document database schema based on the extended Dublin Core metadata and implement a svstem, called xD-MMS which manages the multimedia electronic documents.

• Journal of the Institute of Convergence Signal Processing
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• v.9 no.1
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• pp.62-74
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• 2008

In this paper, we would like to propose the design of symmetric digital filter core in order to use in the radio astronomy. The function of FIR filter core would be designed by VHDL code required at the Data Acquisition System (DAS) of Korean VLBI Network (KVN) based on the FPGA chip of Vertex-4 SX55 model of Xilinx company. The designed digital filter has the symmetric structure to increase the effectiveness of system by sharing the digital filter coefficient. The SFFU(Symmetric FIR Filter Unit) use the parallel processing method to perform the data processing efficiently by using the constrained system clock. In this paper, therefore, for the effective design of SFFU, the Unified Synthesis software ISE Foundation and Core Generator which has excellent GUI environment were used to overall IP core synthesis and experiments. Through the synthesis results of digital filter core, we verified the resource usage is less than 40% such as Slice LUT and achieved the maximum operation frequency is more than 260MHz. We also confirmed the SFFU would be well operated without error according to the SFFU simulation result using the Modelsim 6.1a of Mentor Graphics Company. To verify the function of SFFU, we carried out the additional simulation experiments using the pseudo signal to the Matlab software. From the comparison experimental results of simulation and the designed digital FIR filter, we confirmed the FIR filter was well performed with filter's basic function. So we verified the effectiveness of the designed FIR digital filter with symmetric structure using FPGA and VHDL.

• Journal of The Korean Association For Science Education
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• v.40 no.2
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• pp.227-236
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• 2020

This study examines the change in students' science attitude and the growth of their core competencies through science classes emphasizing digital literacy. To this end, we conducted a study on 116 first graders in C middle school in the C region, and entered a science class that emphasized digital literacy of 35 classes. First, as a result of examining the effect on science attitude, a statistically significant change (p<.05) was observed. The effect size for each subregion ranged from 0.67 to 1.52. Second, there were no differences in the overall frequency of growth perception according to the type of class that emphasized digital literacy. However, in the analysis of core competencies, Web-based classes did not show a large difference in frequency by core competencies, whereas high-tech classes were slightly different by core competencies. This is an implication for science education, and it is necessary to increase the utilization of science classes that emphasize digital literacy.

• Journal of Korea Technology Innovation Society
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• v.8 no.spc1
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• pp.323-336
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• 2005

Digital content industry is growing rapidly because of the property of high-speed networking and greater demand for digital fulltext-image. However, we know the fact that it is many difficulty in production and supply for good quality of content. Hereupon, we suggest digital fulltext-image service framework to protect copyright. More concretely, we propose integrated model and reference model to securely serve digital fulltext-image by recompositing core objects and reconstructing the value-chain structure of digital content industry to framework including the process(from its production (creators or copyrighters) to consumption (users or consumers)). Also, we construct the digital fulltext- image service system based on reference model and reconstruct its interface that occurs between core subjects.