• Journal of Digital Contents Society
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• v.14 no.3
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• pp.323-331
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• 2013

This study aims at investigating and comparing the diphthongs, words, and sentences between two Korean highschool students groups using the Praat program. To do this English words and sentences were uttered and recorded by twenty Korean subjects; each group has ten subjects. All the subjects are female and their grades range from freshman to sophomore. Acoustic features were measured from a sound spectrogram with the help of the Praat software program and analyzed through statistical analysis. Results showed that the lengths of diphthongs and words were different between two groups, but the difference was not significant. However, in the lengths of sentence utterance, the group of 5 to 6 grade students in the current grading system pronounced longer than that of 1 to 2 grade students. Especially in the pronunciation of the first two sentences with more than five words, the difference was significant. From the data of the overall sum of words between the two subject groups, we were able to find out that the differences of the lengths of the words with the diphthongs were not significant, but those of the sentences with more than five words were significant. In the pronunciation of the words between coat and code, the length of the diphthong in coat was smaller than that of in code.

• Journal of Advanced Navigation Technology
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• v.26 no.5
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• pp.358-364
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• 2022

The Inter Communication System for avionics is in charge of processing all voice signals that internal calls between Pilot and Co-pilot, internal calls between Pilots and Crews, external calls through communication equipment such as Ultra/Very High Frequency Receiver/Transmitter(U/VHF RT), audio signal monitoring for navigation and mission equipment such as VHF Omnidirectional Range/Instrument Landing System(VOR/ILS), Tactical Air Navigation(TACAN), audio signal output for voice recording to Flight Data Recorder(FDR) and Data Transfer System(DTS), and warning/caution audio signal generate about the status and threat of aircraft. Because Inter Communication System for avionics is sensitive to noise in the case of analog audio signals, a redundant design that can protect audio signal from electromagnetic noise inside/outside of aircraft is required for the mission of pilots and crews. In this paper, Normal/Back-up operation mode and redundancy design plan based on digital method for the redundancy of the digital Inter Communication System for avionics and manufacturing, verification results are described.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.34 no.1
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• pp.115-127
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• 2024

The recent increase in digital audio media has greatly expanded the size and diversity of sound data, which has increased the importance of sound data analysis in the digital forensics process. However, the lack of standardized procedures and guidelines for sound data analysis has caused problems with the consistency and reliability of analysis results. The digital environment includes a wide variety of audio formats and recording conditions, but current audio forensic methodologies do not adequately reflect this diversity. Therefore, this study identifies Life-Cycle-based sound data elemental technologies and provides overall guidelines for sound data analysis so that effective analysis can be performed in all situations. Furthermore, the identified elemental technologies were analyzed for use in the development of digital forensic techniques for sound data. To demonstrate the effectiveness of the life-cycle-based sound data elemental technology identification system presented in this study, a case study on the process of developing an emergency retrieval technology based on sound data is presented. Through this case study, we confirmed that the elemental technologies identified based on the Life-Cycle in the process of developing digital forensic technology for sound data ensure the quality and consistency of data analysis and enable efficient sound data analysis.

• Annual Conference of KIPS
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• 2021.11a
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• pp.1148-1151
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• 2021

1 인 미디어 산업의 성장으로 다양한 콘텐츠 제작의 증가와 함께 영상의 분위기를 좌우하는 BGM 의 수요도 급증하고 있다. 그러나 무료 음원은 한정되어 있으며 이미 많은 영상에 쓰여 시청자에게 흔한 느낌을 준다. 특히 MCN 에 소속되지 않은 콘텐츠 크리에이터들은 개성 있고 영상에 어울리는 음원 확보에 어려움을 겪고 있다. 본 연구는 이러한 콘텐츠 제작 환경을 개선하기 위해 창작자가 직접 녹음하거나 악보를 스캔해 자신만의 음원을 제작할 수 있는 웹 애플리케이션 '플랫'을 제안한다. 본 연구를 통해 콘텐츠 크리에이터들은 독창적이고 풍성한 콘텐츠를 만들 수 있으며, 음악적 숙련도와 관계없이 쉽게 음원을 만들 수 있어 작곡에 대한 접근성이 좋아질 것으로 보인다. 또한, 딥러닝을 활용해 음악을 창작함으로써 인공지능 작곡 분야를 활성화하고 디지털 음악 시장의 새로운 분야를 개척하는 데 이바지할 것으로 기대한다.

• Journal of Digital Contents Society
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• v.4 no.1
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• pp.45-55
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• 2003

Due to the rapid development of information & communication technology under high performance computing environments, the multimedia production techniques have been applied to a variety of multimedia fields such as general banner advertisements including texts, images and animations, and the internet-broadcasting dealing with videos and sounds. This paper presents an authoring tool with main functions to setup events objects (image, animation, sound, button, area) and to setup action functions, so that non-experts can easily produce multimedia including images, sounds, animations and so on. The authoring tool implemented in Java can be applied to the CD-ROM title production as well as the web-site construction. We can expect that when this authoring tool is used for in multimedia production, both cost and time will be reduced due to its convenience and powerful functions. We have a future plan to integrate intelligent multimedia presentation techniques with the presented tool for the autonomous multimedia authoring works.

• The Journal of the Korea Contents Association
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• v.12 no.5
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• pp.81-90
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• 2012

Since the Canon EOS 5D Mark II with which the Full HD video shooting is possible was launched in 2008, the utilization of the DSLR cameras has been increasing in the video production field. In this thesis, the shortages and advantages of the video functions that the 5D Mark II cameras have will be analysed and they will be compared with the RED cameras that are most widely used in the video production field today. Through this, the utilization of the DSLR camera in the film production field will be investigated. The DSLR camera has the advantage of having good clear picture since it uses the image sensor of big size, and of being able to utilize the various lenses of good quality, and is small in size and light in weight compared to the conventional HD cameras. Although, there are some limitations that there are parts to be improved such as the sound recording problems and development of various additional equipments, the excellent usage that the DLSR cameras have is presenting a new possibility for the film production.

• Journal of Digital Contents Society
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• v.13 no.3
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• pp.279-290
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• 2012

The purpose of this experimental study is to investigate and compare the vowel lengths of the English diphthongs, /eɪ/ and /aɪ/, and the front low vowel /æ/ among English-speaking natives with Korean college students using the Praat software program. To do this English sentences were uttered and recorded by twelve subjects, six Korean subjects and six English-speaking native subjects. All the subjects are female and their age ranges from 23 to 35. Acoustic features(duration) were measured from a sound spectrogram with the help of the Praat software program and analyzed through statistical analysis. Results showed that the vowel lengths of the English diphthongs and the front low vowel between native English speakers and Korean collegians were different. In the pronunciation of the diphthongs /eɪ/ and /aɪ/, Korean subjects pronounced longer than native subjects did, but the difference was not significant. However, in the pronunciation of the English front low vowel /æ/, native subjects pronounced significantly longer than Korean subjects did. From the data of the overall sum of words and vowels between the two subject groups, we were able to find out that the differences of lengths of both the three words and the two diphthongs /eɪ/ and /aɪ/ were not significant, but those of /æ/ were significant.

• Journal of Digital Convergence
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• v.15 no.2
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• pp.421-429
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• 2017

The high rates of smartphone usage among younger people and the negative impacts are well-known, but there remains a paucity of qualitative research on the topic. This study was designed to explore the experiences of university students addicted to smartphones. The author conducted in-depth individual interviews with 17 university students who scored in the upper 5th percentile on a smartphone addiction scale. All interviews were audiotaped, transcribed, and analyzed using qualitative content analysis. Students with a smartphone addiction were trapped in a vicious cycle. More specifically, they were "Realizing something was wrong with withdrawal symptoms," "Having negative consequences," "Seeking escape," and "Staying addicted." This study helped participating students realize their addiction and disclose their emotional and interpersonal difficulties related to their smartphone use. These understandings may be used to refine and further develop school-based programs to better help those addicted to smartphones to recover.

• Journal of Digital Convergence
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• v.19 no.10
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• pp.521-533
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• 2021

The purpose of this study is to explore the self-directed learning experiences of nursing student in an online learning. Data collection was conducted through three focus group interviews from July to August 2021, and the subjects of the study were 15 nursing students who experienced online learning. For analysis, all interviews were recorded and transcribed as the participants said, and analyzed using qualitative content analysis. As a result of the study, 4 categories and 11 subcategories were derived. The four categories which nursing students experienced on online self-directed learning were 'cognitive action of learning motivation', 'preparing my own learning strategy through reflection', 'creating an environment that supports learning', and 'effective online instructional design and enthusiasm of instructors.' The results of this study can be used as basic data for preparing self-directed learning strategies of nursing students in online learning.

• Journal of Digital Policy
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• v.2 no.2
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• pp.21-33
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• 2023

The purpose of this study was to explore the night duty experience on the personal life of fixed night shift nurses working in various health care delivery systems. Data collection was conducted through three focus group interviews from September to October 2022, The subjects of the study were 13 nurses working fixed night shift. For analysis, all interviews were recorded and transcribed and analyzed using qualitative content analysis. In results, 5 themes, 11 categories and 24 subcategories were derived. The five themes were 'it's a voluntary choice', 'efforts to adapt to the shift', 'awareness about fixed night shift', and 'hope to improve the system'. The study aims to help understand fixed night shift work and systems by showing various night-duty experiences on the personal life of the nurses and to provide basic data for preparing measures to improve the system.