브로드캐스트 암호화를 이용한 콘텐츠 제공에 관한 연구

이덕규,이임영 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2

The method of broadcast encryption has been applied to the transmission of digital information such as multimedia, software, and paid TV on the open network. In this broadcast encryption method, only previously authorized users can gain access to digital information. When broadcast message is transmitted, authorized users can first decode the session key using the previously given private key and get digital information using this session key. This way, users retrieve a message or a session key using the key transmitted by broadcasters. For their part, broadcasters need to generate and distribute keys. Broadcasters should also carry out efficient key renewal when users subscribe or un-subscriver. In this paper use a broadcast, and present the DRM model, using that look into the requirement about the contents and apply also the concept of a broadcast encryption. We offer the authority to copy as the number of reproduction to want to the user, and the low so that we were convenient because we used.

게임에서 무엇을 배울까? : 초등학생을 위한 웹 기반 영어교수용 게임 개발을 위한 탐색

민덕기,민경임 청주교육대학교 2001 論文集 Vol.38 No.-

Pixel-Structured Scintillator with Polymeric Microstructures for X-Ray Image Sensors

Im Deok Jung,Min Kook Cho,Kong Myeong Bae,Sang Min Lee,Phill Gu Jung,김호경,김성식,고종수 한국전자통신연구원 2008 ETRI Journal Vol.30 No.5

We introduce a pixel-structured scintillator realized on a flexible polymeric substrate and demonstrate its feasibility as an X-ray converter when it is coupled to photosensitive elements. The sample was prepared by filling Gd2O2S:Tb scintillation material into a square-pore-shape cavity array fabricated with polyethylene. For comparison, a sample with the conventional continuous geometry was also prepared. Although the pixelated geometry showed X-ray sensitivity of about 58% compared with the conventional geometry, the resolving power was improved by about 70% above a spatial frequency of 3 mm-1. The spatial frequency at 10% of the modulation-transfer function was about 6 mm-

Effect of Intermetallic Compound Formation in Friction Welded Al Alloy Rods

Im, Yong-Deok,Park, Kwang-Suk,Song, Kuk-Hyun American Scientific Publishers 2018 Journal of nanoscience and nanotechnology Vol.18 No.3

<P>This study was carried out to evaluate the development of microstructures and mechanical properties on friction welded dissimilar materials with a light weight. For this work, Al6063 and Duralumin alloys with a shape of rod were selected as experimental materials, and friction welding was performed under conditions with a rotation speed of 2,000 RPM, a friction load of 12 kgf/cm(2) and an upset force of 25 kgf/cm(2), respectively. After welding, the microstructural analysis such as the grain boundary characteristic distributions and the formation of intermetallic compounds was analyzed by electron back-scattering diffraction method and transmission electron microscopy, respectively. In addition, the evaluation of mechanical properties on welded materials was conducted by Vickers microhardness and tensile test. As a result, applying the friction welding led to the significant grain refinement from 50 mu m in base material to 2 mu m in welded zone, respectively. In case of mechanical properties, Vickers micro-hardness and tensile strength of the welded material occupied 81% and 96% in fraction relative to the base material, respectively, which was attributable to the formation and growth of intermetallic compounds during the welding.</P>

Effects of Intermetallic Compound Formation in Al/Cu Clad Material Fabricated by Differential Speed Rolling

Im, Yong-Deok,Park, Kwang-Suk,Song, Kuk-Hyun American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.3

<P>In this study, the microstructure and mechanical property of Al/Cu clad material fabricated by differential speed rolling at room temperature were evaluated. Al and Cu plates were prepared and mechanically cladded at a differential speed ratio of 2:1 between the upper and lower rolls. Post-heat-treatment was carried out after the mechanical cladding at 400 degrees C for 60 min to induce the formation of intermetallic compound layers at the bonded interface of Al/Cu. As a result, differential speed rolling afforded a soundly cladded interface without any defects such as voids and cracks. In addition, intermetallic compound layers such as Al4Cu9 and Al2Cu were formed at the mechanically bonded interface during post-heat-treatment for 60 min, which led to an increase in Vickers microhardness value more than 30% relative to the base material. Therefore, we systematically explained the relationship between formation of intermetallic compounds and mechanical property of Al/Cu clad materials in this study.</P>

A Study on the Safe Use of Electric Kickboards

( Im Deok Gyu ),( Kim Hun ),( Min Seung Nam ) 한국감성과학회 2021 추계학술대회 Vol.2021 No.0

Electric kickboards that can be moved conveniently on streets that are difficult to reach by car are being used. However, accidents of people using electric kickboards are also increasing. The causes of accidents include not wearing protective equipment, not parked in a designated parking space, and entering pedestrians. The related laws on electric kickboards are being newly revised in Korea. Therefore, this study collected the problems or issues faced in terms of safety of electric kickboards users or others, through a survey on related laws for improvement. This study also likes to suggest an idea for a smart helmet. The function of the smart helmet is to connect to the device only when the helmet strap is properly locked and to cut off the power of the device if the helmet is not worn as per the wearing instruction. This smart helmet could reduce many accidents.

A Study on the Safe Use of Electric Kickboards

( Im Deok Gyu ),( Kim Hun ),( Min Seung Nam ) 한국감성과학회 2021 한국감성과학회 국제학술대회(ICES) Vol.2021 No.-

Electric kickboards that can be moved conveniently on streets that are difficult to reach by car are being used. However, accidents of people using electric kickboards are also increasing. The causes of accidents include not wearing protective equipment, not parked in a designated parking space, and entering pedestrians. The related laws on electric kickboards are being newly revised in Korea. Therefore, this study collected the problems or issues faced in terms of safety of electric kickboards users or others, through a survey on related laws for improvement. This study also likes to suggest an idea for a smart helmet. The function of the smart helmet is to connect to the device only when the helmet strap is properly locked and to cut off the power of the device if the helmet is not worn as per the wearing instruction. This smart helmet could reduce many accidents.

Application of Etchant Jet for Laser Micromachining of Metal Channels

Im, Hyun-Deok,Oh, Kwang-Hwan,Kim, Soo-Geun,Jeong, Sung-Ho 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.4

A laser micromachining technique that employs etchant jet for thermochemical wet etching of metallic channels is introduced In this method, the etchant supplies chemicals for thermochemical reaction and laser beam delivered through an optical fiber provides the thermal energy. For the generation of etchant jet, a nozzle with a gap control function is utilized. By using this method, microchannels with a triangular cross-sectional profile and a depth ranging from 100 to $300{\mu}m$ and a width ranging from 100 to $200{\mu}m$ are fabricated on stainless steel 304. Since the etchant is supplied in the form of a liquid jet, it is expected that this technique can be applied for the fabrication of microchannels on industry scale workpiece. The variation of channel size and shape with respect to process parameters is examined. Also, the potential application to the fabrication of metallic microchannels with high-aspect-ratio is investigated.

전래동화를 활용한 교육연극 효용성 탐구 -이해력과 표현력 향상을 중심으로-

배덕임 ( Deok Im Bae ) 한민족어문학회 2016 韓民族語文學 Vol.0 No.72

본 연구는 전래동화를 활용한 교육연극 활동을 통해 아이들이 자유롭게 상상하고, 깊이 있게 생각하고, 인물의 다양한 측면을 체험하면서 이해하고 표현할 수 있는 효과에 대해 고찰해 보았다. 연구를 통해 전래동화를 교육연극으로 선정하는 기준을 설정하고, 전래동화를 교육연극으로 활용했을 때의 효과 등에 대해 고찰하였다. 이와 같은 이론적토대를 바탕으로 전래동화를 활용한 교육연극이 아이들의 표현력과 이해력을 높일 수있음에 대해 개진하였다. 전래동화 작품을 활용하여 아이들의 이해력 및 표현력을 향상 시킬 수 있는 활동으로 ‘as if∼’ 활동과 ‘인물 탐구’ 활동을 설정하였다. 설정한 활동을 통해 교육연극 활동이 인물을 다양한 측면에서 체험 가능하게 하고, 작품의 이해도를 높일 수 있게 한다는 점을 탐구 하였다. 이와 같은 연구결과를 토대로 하여 아이들의 다양한 이해력 및 표현력을 높이고자 하는 수업에 전래동화를 활용한 교육연극 활동들이 적극적으로 활용될 수 있기를 바라는 바이다. 본 연구에서 소개 된 활동들은 개별화 되어 수업에 적용될 수 있고, 수업 시간의 상황과 학습자의 여건에 따라 서로 융합하여 적용할 수도 있을 것이다. 본 연구에서 제시된 교육연극은 참여자들에 의해 끊임없이 새롭게 재창조 될 수 있는 방법을 지향하였다. This study considers the way that, through educational play activities using a traditional fairly tale, children are able to imagine a traditional fairly tale freely, think about it deeply, and express it after experiencing a character``s various aspects. The study analyzes the selection standards of an education play, and advantages of choosing a fairly tale for it. With these theoretical bases, the study sets forth that an education play using a fairly tale is able to enhance children``s powers of expression and comprehension. The study suggests two activities that enhances children``s powers of expression and understanding using a fairly tale: the ‘as if~`` activity and the ‘exploring characters`` activity. The activities are designed to make it possible for children to experience a character in various aspects and understand a literary work more deeply. It is expected that children are able to enhance their powers of expression and comprehension through them. The activities are able to be applied to classes with individualization, or with convergence according to a class``s situation and learners`` conditions. The model of instruction in the study is aimed at being a way that is able to be recreated constantly by participants. The study has significance in that it lays the foundation for the methods of instruction of an educational play using a fairy tale theory, on which the number of researches is slight, and explores its effects.

「꼬마 옥이」내의 그림자모티프 연구

배덕임 ( Deok Im Bae ) 건국대학교 동화와번역연구소(구 건국대학교 중원인문연구소) 2008 동화와 번역 Vol.16 No.-

After learning that the shadow motif in KkomaOk-i,one of LeeWon-su’s masterpieces, is not only a simple material, but also has an important literary function, I undertook the study of it. A shadow has been interpreted in various ways. There is no doubt the imagery associated with shadows, which have fascinated people since primitive times, has expanded its meaning more broadly in these modern days. In this study, I clarify that the shadow motif was deeply related to the subject and the descriptive rhetorical style in KkomaOk-i. Moreover, I used the theory of Carl Gustav Jung as a foundation when I described that the shadow motif was strongly associated with the subject of love. I demonstrated that the shadow which appeared in Kkoma Ok-i was used in two ways: as a medium of the illusion world and a medium showing the unconsciousness of man. These media were the means that formed the subject of love. The reason why Lee Won-su used the shadow motif to form the subject was that a shadow could haunt both the illusion world and the unconsciousness world. The shadow motif appeared widely in Kkoma Ok-i, taking charge of the construction of the foundation for the formation of the subject. Lee Won-su brought the extension of cognition by using the shadow motif, so love, which he used as the subject, could transcend individual and racial dimensions and arrive at the human dimension. Lee Won-su connected the illusion world and the unconsciousness world by the shadow motif. He also used the shadow motif for showing a real form of ego which was realized by being projected on another object. Hence, the shadow motif appearing in Kkoma Ok-i does not have a simple meaning but is a symbol language which expresses various meanings and has an important position in the construction of descriptions.