• Title/Summary/Keyword: 녹음방지

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A Study on portable voice recording prevention device (휴대용 음성 녹음 방지 장치 연구)

  • Kim, Hee-Chul
    • Journal of Digital Convergence
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    • v.19 no.7
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    • pp.209-215
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    • 2021
  • This study is a system development for voice information protection equipment in major meetings and places requiring security. Security performance and stability were secured with information leakage prevention technology through generation of false noise and ultrasonic waves. The cutoff frequency band for blocking the leakage of voice information, which has strong straightness due to the nature of the radio wave to the recording prevention module, blocks the wideband frequency of 20~20,000Hz, and the deception jamming technology is applied to block the leakage of voice information, greatly improving the security. To solve this problem, we developed a system that blocks the recording of a portable smartphone using a battery, and made the installation of a separate device smaller and lighter so that customers do not recognize it. In addition, it is necessary to continuously study measures and countermeasures for efficiently using the output of the anti-recording speaker for long-distance recording prevention.

A Study on Recrystallization of Polysilicon Using Lamps (램프를 이용한 폴리실리콘 재결정화)

  • Choi, Jin-Ho;Jang, Yun-Seok
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05a
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    • pp.206-209
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    • 2002
  • 본 논문에서는 폴리실리콘의 재결정화 공정에서 발생하기 쉬운 폴리실리콘의 엉김현상, 슬립, 부분적인 실리콘 기판의 녹음현상 등을 방지하기 위한 방법을 제시한다. 그리고 재결정화 된 박막의 질을 향상시키기 위한 폴리실리콘과 보호 산화막(capping oxide)의 두께 변화에 따른 실험 결과를 살펴본다. 폴리실리콘의 엉김현상은 매몰 산화막(buried oxide)과 액체 상태의 실리콘 사이의 wetting angle과 관계되는데, 이를-방지하기 위해서는 재결정화할 폴리실리콘과 산화막의 계면에 질소를 주입시켜주면 되는데, 이는 재결정화할 시료를 암모니아 가스 분위기에서 열처리를 통하여 해결할 수 있다. 그러고 실러콘 기판의 국부적 녹음 현상 및 슬립은 실리콘 기판의 윗면을 mechanical damage에 의해서 약 $20{\mu}m$ 정도의 거칠기를 가지도록 하면 이러한 현상을 방지할 수 있다. 그러고 폴리실리콘이 재결정활 될 때 부피의 변화가 발생하며, 이로 인하여 재결정화된 박막의 두께는 위치에 따라 변화한다. 재결정화된 박막 두께의 균일도를 유지하기 위해서는 재결정화할 폴리실리콘 두께의 3배 이상이 되는 보호 산화막을 사용하였을 때 원하는 균일도를 얻을 수 있었다.

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A Unique Identification hiding technique for Internet Broadcast service of Digital Audio (디지털 오디오의 인터넷 방송 서비스를 위한 저작물 식별 코드 은닉 기술)

  • 신승원;김종원;최종욱
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2001.11b
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    • pp.163-168
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    • 2001
  • 본 논문은 인터넷을 이용한 방송 서비스에서 저작권 보호 및 저작물 식별을 위한 고유 식별 정보(unique identification)를 삽입, 추출하는 기술을 제안한다. 인터넷을 통한 방송 서비스의 활성화를 위해서는 저작권의 보호와 저작물의 불법 사용 방지, 저작물에 대한 저작권료 지불, 그리고 차후에 불법 사용자의 적발 등을 할 수 있는 기술이 필요하다. 본 논문에서 제안하는 기술은 디지털 음악을 소비자에게 서비스할 때, 사용자의 아이디(ID)와 신상 정보를 이용해서 생성된 정보와 음악의 식별 정보를 같이 저작물에 삽입하여 다운로드 받은 음악 파일이나 또는 청취 중에 녹음한 음악 파일을 불법으로 유통시킬 경우에 유통된 음악 파일에서 삽입된 식별코드를 추출하여 음악 파일의 불법 유통경로를 추적하여 불법 사용자를 적발할 수 있는 기능을 갖고 있다. 이러한 기능을 만족시키기 위해서 인터넷 서비스에서 널리 이용되는 MP3, AAC, WMA 등과 같은 손실 압축을 거친 이후에도 삽입된 워터마크를 검출할 수 있으며, 일반 사용자들이 손쉽게 접할 수 있는 여러 신호처리에도 강인한 특성을 갖는 기술을 제안한다.

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디지털 오디오의 인티넷 방송 서비스를 위한 저작물 식별 코드 은닉 기술$^{(1)}$

  • 신승원;김종원;최종욱
    • Proceedings of the Korea Multimedia Society Conference
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    • 2004.05a
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    • pp.103-106
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    • 2004
  • 본 논문은 인터넷을 이용한 방송 서비스에서 저작권 보호 및 저작물 식별을 위한 고유 식별 정보(unique identification)를 삽입, 추출하는 기술을 제안한다. 인터넷을 통한 방송 서비스의 활성화를 위해서는 저작권의 보호와 저작물의 불법 사용 방지, 저작물에 대한 저작권료 지불, 그리고 차후에 불법 사용자의 적발 등을 할 수 있는 기술이 필요하다. 본 논문에서 제안하는 기술은 사용자 관련 정보와 음악의 식별 정보를 저작물에 삽입하여 다운로드 받은 음악 파일이나 또는 청취 중에 녹음한 음악 파일의 불법 복제를 막는 방법이다. 저작물을 불법으로 유통시킬 경우에 유통된 음악 파일에서 삽입된 식별코드를 추출하여 음악 파일의 불법 유통경로를 추적하여 불법 사용자를 적발할 수 있도록 하였다. 이러한 기능을 만족시키기 위해서 인터넷 서비스에서 널리 이용되는 MP3, AAC, WMA 등과 같은 손실 압축을 거친 이후에도 삽입된 워터마크를 검출할 수 있으며, 일반 사용자들이 손쉽게 접할 수 있는 섞어 신호처리에도 강인한 특성을 갖는 기술을 제안한다.

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Universal Personal Telecommunications using Specialized Resource Functions in the Intelligent Peripheral (Intelligent Peripheral의 특수 음성 자원을 이용한 Universal Personal Telecommunications 서비스)

  • Kim, Gi-Ryeong;Kim, Tae-Il;Choe, Go-Bong
    • The Transactions of the Korea Information Processing Society
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    • v.3 no.6
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    • pp.1506-1514
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    • 1996
  • This paper proposes enhanced features for the Universal Telecommunications (UPT), voice authentication and voice synthesis, using the specialized resources functions in the Intelligent peripheral(IP). The proposed voice authentication is able ti provide simple and user-friendly security mechanism and to prevent unauthorized users from fraudulently using the UPT number. Also, traditional UPT service deliveries only fixed message to the UPT user, but the proposed UPT service can support flexible message transfer by use of the voice synthesis.

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A Study on the Self-voice Suppression Algorithm in a ZigBee CROS Hearing Aid (지그비 크로스 보청기에서의 자기음성 억제 알고리즘 연구)

  • Im, Won-Jin;Goh, Young-Hwan;Jeon, Yu-Yong;Kil, Se-Kee;Yoon, Kwang-Sub;Lee, Sang-Min
    • Journal of IKEEE
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    • v.13 no.3
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    • pp.62-71
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    • 2009
  • In this study, we developed a wireless CROS(contralateral routing of signal) hearing aid for unilateral impaired people. CROS hearing aid takes sound from an ear with poorer hearing and transmit to another ear with better hearing. Generally, the self-voice delivered through the receiver of CROS hearing aid can be very loud. It is hard to perceive target speech because of loud self-voice. To compensate it, a self-voice suppression algorithm has been developed. we performed SDT(speech discrimination test) for evaluation of the self-voice suppression algorithm. One-syllable words was used as test speech and recorded with self-voice at a 1m distance. As the results, SDT score was improved about 11% when the self-voice suppression algorithm was processed. It is verified that the self-voice suppression algorithm helps speech perception at a time to communicate with others.

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Evaluation of Robustness of Deep Learning-Based Object Detection Models for Invertebrate Grazers Detection and Monitoring (조식동물 탐지 및 모니터링을 위한 딥러닝 기반 객체 탐지 모델의 강인성 평가)

  • Suho Bak;Heung-Min Kim;Tak-Young Kim;Jae-Young Lim;Seon Woong Jang
    • Korean Journal of Remote Sensing
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    • v.39 no.3
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    • pp.297-309
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    • 2023
  • The degradation of coastal ecosystems and fishery environments is accelerating due to the recent phenomenon of invertebrate grazers. To effectively monitor and implement preventive measures for this phenomenon, the adoption of remote sensing-based monitoring technology for extensive maritime areas is imperative. In this study, we compared and analyzed the robustness of deep learning-based object detection modelsfor detecting and monitoring invertebrate grazersfrom underwater videos. We constructed an image dataset targeting seven representative species of invertebrate grazers in the coastal waters of South Korea and trained deep learning-based object detection models, You Only Look Once (YOLO)v7 and YOLOv8, using this dataset. We evaluated the detection performance and speed of a total of six YOLO models (YOLOv7, YOLOv7x, YOLOv8s, YOLOv8m, YOLOv8l, YOLOv8x) and conducted robustness evaluations considering various image distortions that may occur during underwater filming. The evaluation results showed that the YOLOv8 models demonstrated higher detection speed (approximately 71 to 141 FPS [frame per second]) compared to the number of parameters. In terms of detection performance, the YOLOv8 models (mean average precision [mAP] 0.848 to 0.882) exhibited better performance than the YOLOv7 models (mAP 0.847 to 0.850). Regarding model robustness, it was observed that the YOLOv7 models were more robust to shape distortions, while the YOLOv8 models were relatively more robust to color distortions. Therefore, considering that shape distortions occur less frequently in underwater video recordings while color distortions are more frequent in coastal areas, it can be concluded that utilizing YOLOv8 models is a valid choice for invertebrate grazer detection and monitoring in coastal waters.

Location and Construction Characteristics of Imdaejeong Wonlim based on Documentation (기문(記文)을 중심으로 고찰한 임대정원림(臨對亭園林)의 입지 및 조영 특성)

  • Rho, Jae-Hyun;Park, Tae-Hee;Shin, Sang-Sup;Kim, Hyoun-Wuk
    • Journal of the Korean Institute of Traditional Landscape Architecture
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    • v.29 no.4
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    • pp.14-26
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    • 2011
  • Imdaejeong Wonlim is located on the verge of Sangsa Village in Sapyeong-ri, Daepyeong-myeon, Hwasun-gun Gyeongsangnam-do toward Northwest. It was planned by Sa-ae, Minjuhyeon in 1862 on the basis of Gobanwon built by Nam Eongi in 16th century against the backdrop of Mt. Bongjeong and facing Sapyeong Stream. As water flows from west to east in the shape of crane, this area is a propitious site standing for prosperity and happiness. This area shows a distinct feature of Wonlim surrounding the Imdaejeong with multi layers as consisting of 5 districts - front yard where landmark stone with engraved letters of 'Janggujiso of Master Sa-ea' and junipers are harmoniously arranged, internal garden of upper pavilion ranging from a pavilion to square pond with a little island in the middle, Sugyeongwon of under pavilionu consisting of 2 ponds with a painting of three taoist hermits, forest of Mt. Bonggeong and external garden including Sapyeong Stream and farmland. According to documentation and the results of on-site investigation, it is certainly proved that Imdaejeong Wonlim was motivated by Byeoseo Wonlim which realized the idea of 'going back to hometown after resignation' following the motives of Janggujiso, a hideout aimed to accomplish the ideology, 'training mind and fostering innate nature,' on the peaceful site surrounded by water and mountain, as well as motives of Sesimcheo(洗心處) to be unified with morality of Mother Nature, etc. In addition, it implies various imaginary landscapes such as Pihangji, Eupcheongdang, square pond with an island and painting of three Taoist hermits based on a notion that 'the further scent flies away, the fresher it becomes,' which is originated from Aelyeonseol(愛蓮說). In terms of technique of natural landscape treatment, divers techniques are found in Imdaejeong Wonlim such as distant view of Mt. Bongjeong, pulling view with an intention of transparent beauty of moonlight, circle view of natural and cultural sceneries on every side, borrowed scenary of pastoral rural life adopted as an opposite view, looked view of Sulyundaero, over looked view of pond, static view in pavilion and paths, close view of water space such as stream and pond, mushroom-and-umbrella like view of Imdaejeong, vista of pond surrounded by willows, imaginary view of engraved letters meaning 'widen knowledge by studying objectives' and selected view to comprise sunrise and sunset at the same time. In the beginning of construction, various plants seemed to be planted, albeit different from now, such as Ginkgo biloba, Phyllostachys spp., Salix spp., Pinus densiflora, Abies holophylla, Morus bombycis, Juglans mandschurica, Paulownia coreana, Prunus mume, Nelumbo nucifera, etc. Generally, it reflected dignity of Confucianism or beared aspect of semantic landscape implying Taoist taste and idea of Phoenix wishing a prosperity in the future. Furthermore, a diversity of planting methods were pursued for such as liner planting for the periphery of pond, bosquet planting and circle planting adopted around the pavilion, spot planting using green trees, solitary planting of monumentally planted Paulownia coreana and opposite planting presenting the Abies holophylla into yin and yang.

Case Study of Teaching Practices of Biology Teachers with and without Research Experience in Evolution Education (진화 교육 연구 경험 유무에 따른 생명과학 교사의 교수 실행 사례 연구)

  • Ko, Yuseon;Cha, Heeyoung;Lim, Mili
    • Journal of The Korean Association For Science Education
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    • v.37 no.4
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    • pp.747-761
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    • 2017
  • The purpose of this study is to analyze differences in the teaching practices of biology teachers according to their awareness of the importance of evolution. For this purpose, two teachers who experienced study of evolution and recognized its importance, along with two teachers with no experience in evolution education in the comparison group, were included in the sample. To observe teaching practices, two classes each on biological evolution and non-evolution were selected, recorded and transcribed. The content analyzed included the teachers' view on evolution education and teachers' evolution concepts reflected in teaching practice. As a result, the level of understanding of the teachers' evolution concept was unrelated to teachers' awareness of the importance of evolution. Instead, each teacher would not feel the need for religious beliefs or awareness of the importance of evolution to have a negative impact on the awareness of the importance of evolution. Inexperienced teachers tend to reject the retraining opportunities to recognize the importance of evolution. In addition, inexperienced teachers were only superficially aware of the evaluation and improvement of evolution presented in textbooks and curricula. In actual teaching practice analysis, inexperienced teachers' utilizing ratio of the evolution key concept was higher than that of experienced teachers. Only experienced teachers were aware of the misconceptions presented in their execution and described the causes that appear in these misconceptions. Teachers who recognized the importance of evolution were widely using the key concepts of evolution, as well as more practical in preventing the misconceptions related to evolution forms. It indicates that biology teachers who do not realize the importance of evolution in biology education need to experience explicit and practical education programs as well as instructional materials on evolution.