• Journal of Korean Society of Coastal and Ocean Engineers
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• v.16 no.3
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• pp.171-177
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• 2004

A new wave gauge using digital image of waves is developed and the performances are tested by wave tank experiments. This wave gauge uses frame frequency of 1/15 sec, conversion of analog images to digital images, and large capacity of hard disk. This wave gauge measures wave heights by detecting the buoy movement automatically from the image, where the buoy moves with the same phase of water surface. The comparison of automatic measurements of wave heights to the true data is reasonable. The wave gauge can be improved to measure wave heights on shallow waters near shorelines.

• Journal of Fisheries and Marine Sciences Education
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• v.17 no.1
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• pp.76-85
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• 2005

GIS (Geographic Information Systems) technology is a necessary function to support location based on service by using GPS in the mobile environment. These mobile systems have basic functional limitations such as a low rate of processing, limited memory capacity, and small screen size. Because of these limitations, most of the mobile systems require development of a reduced digital map to overcome problems with large-volume spatial data. In this paper, we suggest using the reduced digital map format in order to use location based on service in a PDA environment. The processing of the proposed data format consists of map generation, redefinition of layers, creating polygons, and format conversion. The proposed data format reduces the data size by about 98% comparing with DXF format based on the digital map of Busan.

• Proceedings of the KIEE Conference
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• 2002.11d
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• pp.363-365
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• 2002

train radio system used for shinkansen in japan has been 18 years since it was opened in 1982 and grown old. Analogue train radio is short of the number of lines and can't cope with the needs for the new high speed data transmission by 1,200 bps. The construction to renew the Tohoku - Joethu shinkansen train radio system(shinkansen train radio system) with digital method started from 2000 in JREast Digital method makes it possible to improve the quality of radio transmission, reliability of the network and every device, the speed and capacity of transmission and to be more efficient maintenance by introducing the latest IT technology. This paper will consider synchronization between base station. diversity method. software receiver, mobile high speed digital radio system, high reliability LAN introduced as technologies supporting these.

• Journal of Information Processing Systems
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• v.15 no.2
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• pp.261-270
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• 2019

In order to protect secret digital documents against vulnerabilities while communicating, steganography algorithms are applied. It protects a digital file from unauthorized access by hiding the entire content. Pixel-value-difference being a method from spatial domain steganography utilizes the difference gap between neighbor pixels to fulfill the same. The proposed approach is a block-wise embedding process where blocks of variable size are chosen from the cover image, therefore, a stream of secret digital contents is hidden. Least significant bit (LSB) substitution method is applied as an adaptive mechanism and optimal pixel adjustment process (OPAP) is used to minimize the error rate. The proposed application succeeds to maintain good hiding capacity and better signal-to-noise ratio when compared against other existing methods. Any means of digital communication specially e-Governance applications could be highly benefited from this approach.

• Journal of Digital Convergence
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• v.18 no.10
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• pp.163-173
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• 2020

This study examinined the casual relationship between consulting service characteristics and management performance based on absorption capacity and innovative willingness in order to find out the factors of effective consulting In an age of infinite competition. 131 questionnaires were used to test 8 hypotheses using SPSS 22.0 and SmartPLS(3.3.2). Results are as follows: expertise and consultant knowledge among consulting service characteristics had a significant positive impact on management performance through the company's absorption capacity and innovative willingness. However, the consultant's attitude had no significant effect. This study suggests the necessary of factors that can enhance the consulting effectiveness. We would like to consider and analyze the psychological variables that can enhance the various attributes and management performance of consulting in future research.

• Journal of Digital Contents Society
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• v.6 no.2
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• pp.101-106
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• 2005

In this paper, performance evaluation of mobile access layer for multiple-input multiple-output (MIMO) MultiCarrier(MC)/CDMA 16 QAM system is considered to mitigate multiple access interference and enhance system channel capacity in Rayleigh wireless fading channel. Traditionally, multi-path is viewed as an undesirable feature of wireless communications. Therefore, diversity and adaptive array schemes are proposed to mitigate its effects. Recently, to increase the spectrum efficiency and the link reliability, MIMO schemes is devised to exploit multi-path in a scattering wireless channel. In particular, the channel capacity of MIMO-MC/CDMA 16 QAM system is evaluated according to Eb/No, Mc, p. From the results, in order to improve the channel capacity, the signals at various elements must be uncorrelated. And if the paths are correlated due to inappropriate spacing or mutual coupling effects, the channel capacity of MIMO-MC/CDMA 16 QAM system becomes substantially smaller.

• Journal of Digital Convergence
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• v.14 no.7
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• pp.363-371
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• 2016

Technology evaluation for technology innovation of venture firms should take the rapidly changing corporate environment, the ambiguity of language used in evaluation, and the inaccuracy of evaluation index into consideration. In this paper, targeting the absorptive capacity and technological entrepreneurship which are typical evaluation factors of venture firms, an ACTEM model to calculate the importance, priority, and dynamic capability of factors, applying Fuzzy-AHP was proposed. The fuzzy theory was introduced to compensate for the ambiguity of cognitive judgments when calculating weighted values for the factors that made up an assessment scale. An assessment criteria framework for absorptive capacity, technological entrepreneurship, and dynamic capability, which were not considered in previous studies on the evaluation and measurement of technological prowess, so that the users could have a realistic alternative to choose. The study compared the ACTEM model with the old AHP assessment method and found that "knowledge acquisition" and "producing ability" were the highest in absorptive capacity and technological entrepreneurship, respectively, thus demonstrating its validity.

• Journal of the Korean Society for information Management
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• v.33 no.1
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• pp.269-292
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• 2016

Digital preservation becomes, nowadays, one of the important business process in the academic libraries. This study is to investigate the librarians' perception on digital preservation requirements and to analyze the business practices of the digital preservation and digital preservation level in the 102 academic libraries. In results, it is found that the digital preservation specialists in academic libraries have almost same perception on basic policies and direction. Also, the study finds that the important function of digital preservation is to secure authenticity and integrity; policy and expertise are the most important key components for digital preservation; the most frequently reported barriers to preservation are the lack of willingness and funding problems; most librarians want to learn and train how to establish preservation planning and policy. In general, most librarian think that the level of digital preservation in the academic libraries is insufficiency. Therefore the academic libraries should establish the relevant digital preservation policy and business workflows and to develop capacity of digital preservation.

• Journal of Korean Library and Information Science Society
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• v.51 no.1
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• pp.91-114
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• 2020

Due to the settlement of the ICT environment and the widespread dissemination of Net media, the quantitative digital divide based on access to information has evolved into the formation of a qualitative digital divide. In the current information environment where enormous amounts of information exist on the Internet, there is a deeper intellectual digital divide that is different from the existing quantitative and qualitative digital divide. This study identified the changes in digital divide resulted from the evolution of information environment and empirically verified the formation of the intellectual digital divide. It also demonstrated that the intellectual digital divide is not distinct from the existing quantitative and qualitative digital divide, but from differences in the intellectual capacity of the information based on the factors of the existing digital divide. In particular, it was confirmed that the educational and economic levels, which have been the key factors of the traditional digital divide, still form the quantitative and qualitative digital divide, and also act as the key factors in the formation of the intellectual digital divide.

• Journal of the Korean Society for information Management
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• v.34 no.4
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• pp.247-271
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• 2017

Digital curation which maintains digital information over time and adds value becomes, nowadays, one of the important business process in the special libraries. This study is to investigate the business practice level of the digital curation in the special libraries and the librarians' perception on the importancy of digital curation. In results, it is found that most librarian, in general, think that the level of digital curation practice in the special libraries is insufficiency. Also, the study finds that the librarians of special libraries have difficulties in terms of the lack of willingness and funding problems as well as the lack of long-term policies and suitable business procedures; they only focus the cycle of information organization-information storage-information use among the 8 processes of digital curation; they need to recognize the importance of digital preservation as one of the essential process of digital curation and make effort to extend technological capacity of digital preservation.