• Proceedings of the Optical Society of Korea Conference
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• 2008.07a
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• pp.169-171
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• 2008

마이켈슨 간섭계 시스템에 두 개의 Convex Lens를 추가함으로서 평면파 참조광을 유지 시키며, 물체에 조사되는 물체광의 조사면적을 변화시킬 수 있는 새로운 형태의 마이켈슨 간섭계를 제작 하였다. 새로운 형태의 마이켈슨 간섭계를 반사형 디지털 홀로그래피 현미경 시스템(Digital Holography Microscope System)에 적용하여 촬상소자(CCD: Charge Couple Device)에 홀로그램 기록 시 기록 가능한 CCD의 유효 영역과 재생 가능 영역에 대해 연구를 하였다

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.11-12
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• 2007

In order to verify a digital substation based on IEC 61850, KEPRI in charge of POWER IT project related to SAS has constructed IED conformance testing system, which consists of HMI, IED (Intelligent Electronic Device), network equipment, V/I generator, and performed the interoperability test between two IEDs made by other vendors. The test was proceeded based on SCL and with system integrated tools

• Journal of Digital Convergence
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• v.12 no.1
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• pp.511-518
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• 2014

The purpose of this study is to produce and distribute a smart device based educational application for culinary practice. This study was performed from Jul. 1 to Dec. 30, 2012. The design of the application is composed of the theoretical contents, making methods, practice video and evaluation questions of Western cuisine among the contents of the culinary practice education. In addition, the notice and Q&A were added for the interaction between teachers and learners. For this study, 31 main dishes' pictures, 155 pictures for making processes by menu, 31 recipes, 31 cooking tips, 372 evaluation questions and 31 cooking videos about 31 menus were produced. The contents produced as above were directly inserted at 'http://kongju-fn.dslink.co.kr/super/index.html' to produce the application. This application can be found through searching with the word of 'yoribaksa'. This study can be considered to be significant in that this application was produced in the situation of the absence of any other previous applications for culinary practice education.

• Journal of Digital Convergence
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• v.12 no.1
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• pp.379-388
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• 2014

We noted that substituting hard disk with high-performance storage device on SAN did not immediately result in getting high performance. Investigating the reason behind this leaded us to propose optimization schemes for high-performance storage system. We first got rid of the latency in the I/O process which is unsuitable for the high-performance storage device, added parallelism on the storage server, and applied temporal merge to Superhigh speed network protocol for improving the performance with small random I/O. The proposed scheme was implemented on the SAN with high-performance storage device and we verified that there were about 30% reduction on the I/O delay latency and 200% improvement on the storage bandwidth.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.4
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• pp.781-792
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• 2015

This paper proposes a virtual and invisible private disk (VIPDISK) technology equipped with the secure storage devices. As a software based security technology, it can create hidden partitions on any data storage device which can not be identified by the windows OS, so the program running on it, does not have any evidence of the existence of the hidden storage space. Under inactive state, it maintains an unexposed secure partition which can only be activated with a matching combination of a unique digital key and a user password to open the decryption tool. In addition, VIPDISK can store data to secure storage device with real-time encryption, it is worry-free even in the case of lost or theft. Simulation results show that VIPDISK provides a much higher level of security compared to other existing schemes.

• Journal of Digital Convergence
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• v.18 no.10
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• pp.219-224
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• 2020

The purpose of this study is to develop a device to replace the pre-boring method, which is generally constructed, to prevent pile damage caused by tension cracks that reason from tension waves generated during PHC pile construction on soft ground. Tension cracks are caused by tension waves from the hammer striking during the PHC pile hitting on the soft ground, which in turn leads to faulty construction. In order to prevent the occurrence of tension waves generated during driving, apply separate driving force increasing device to prevent the generation of tension waves, and pile damage as well. Also, it is an eco-friendly construction method that reduces smoke and noise by improving construction speed, reducing construction costs, and able to small equipment when developing equipment. This development equipment is a piece of effective equipment that can pioneer the Saemangeum reclamation area, the South-east Asian construction market, where the Deep soft ground is distributed.

• Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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• v.26 no.2
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• pp.104-111
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• 2015

Background and Objectives : Acoustic analysis of voice could be influenced so much by the quality of voice files which were recorded by recording device. In clinical practice, voice files that were recorded by analysis program directly or portable digital recording device were analyzed mostly. This study examined the feasibility of using Galaxy smartphone recordings for acoustic analysis of voice. Materials and Methods : Acoustic measures were compared between voice signals recorded from 30 normal speakers (15 males and 15 females) through Galaxy smartphone, portable digital recording device and CSL. Fo, jitter, shimmer, NHR (Noise-Harmony ratio) and Formant frequencies were analyzed by MDVP. Results : Fo, Jitter, Shimmer, NHR and formant frequencies from 3 devices were no significantly difference. The intraclass correlation coefficient (ICC) was higher between each of the voice perturbation measures. Conclusion : The findings indicated that Galaxy smartphone recording system was useful device for acoustic analysis of voice. Furthermore, Galaxy smartphone can be applied widely in various way for acoustic analysis of voice.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.4C
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• pp.295-307
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• 2002

The IEEE 1394 protocol is a de facto standard in multimedia digital home network. It supports several advanced features such as hot plugging, dynamic network reconfiguration, isochronous transmission and so on. Since the IEEE 1394 was adapted in the field of multimedia service with QoS guarantee, back bone network protocol with reel-time digital instrumentation and control sub networks, and physical layer protocol for real-time middleware such as real-time CORBA, the additional real-time features has been required in device driver implementation because of the necessity of the predictability enhancement. To guarantee the real-time features, the device driver of the IEEE 1394 should support the priority based packet processing and also need a isochronous buffer management mechanism to deal with the periodic isochronous communication. In this paper, we proposed a new software architecture of the IEEE 1394 device driver for supporting the real-time characteristics such as priority based packet processing, priority based scheduling and so on.

• Journal of Digital Contents Society
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• v.18 no.4
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• pp.699-706
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• 2017

This study aims to investigate the effects of a massage device with vibration and pressure functions and a manual massage on the degree and duration of pain among patients after intramuscular injection. This study used a quasi-experimental design with nonequivalent control group. The experimental group had lower pain scores (t= 7.40, p =.001) and shorter durations of pain (t= 5.25, p=.001) than the control group. The results showed that after intramuscular injection, a massage device with vibration and pressure functions effective to reduce the degree and duration of pain than a manual massage. Therefore, the application of a massage device with vibration and pressure functions after intramuscular injection will contribute to the promotion of patient safety and the reduction of nurse workload.

• Journal of Digital Convergence
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• v.18 no.9
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• pp.379-389
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• 2020

This is a qualitative study about Google 'Nest Hub Max' that displays proactive intelligent personal assistant. Following the step of grounded theory, an in-depth interview for 6 users who had used this device for a month was taken. 186 concepts were discovered, categorized as 11 top-categories and 24 sub-categories. Paradigm diagram, considering axis-coding, was made and it have been narrowed down to 'Usage patterns' of proactive IPA, considering selective coding aspects. 'Usage patterns' were divided to passive and active user. Thus, neither passive user nor active user was satisfied about device and proactive IPA. This study is meaningful that it constructed basic data about the user experience of proactive IPA on this device. It will support the device or service that consists proactive IPA in the future.