• 정보보호뉴스
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• s.134
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• pp.14-18
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• 2008

KISA가 웹 서버 보안강화를 위한 웹쉘(WebShell) 탐지 프로그램 '휘슬(WHISTL)'을 일반 기업에 보금한다고 밝혔다. KISA 인터넷침해사고대응지원센터가 침해사고 예방과 대응을 위해 자체적으로 개발해 사용하던 탐지 프로그램인 휘슬은 기존 프로그램을 기업 서버 관리자가 편리하게 사용할 수 있도록 보완해 재배포하는 것이다. 기업 서버 관리자에게 편리함을 안겨 줄 휘슬의 주요 기능을 살펴보자.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2012.04a
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• pp.294-295
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• 2012

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.150-151
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• 2009

• The Journal of the Acoustical Society of Korea
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• v.37 no.6
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• pp.404-411
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• 2018

This paper proposes a dolphin whistle mimicking underwater communication method using FSK (Frequency Shift Keying) and method to improve BER (Bit Error Rate) performance by using multipath gain combining. The proposed method divides whistle sound into short time intervals and transmits FSK modulated signal that ensures orthogonality of the symbol. Multipath gain can be obtained by using characteristic of mimicked signal frequency that varies with time. To demonstrate the performance of the proposed method, computer simulations and lake experiments were conducted. Computer simulation results show that an additional multipath gain is obtained by multipath. From lake experiments, when symbol length is 20 msec and modulation band is 900 Hz, the proposed FSK method with multipath combining gain obtains BER of 0.002, which is better than CSS (Chirp Spread Spectrum) with BER of 0.185. he proposed based on FSK method has higher imitation degree than the CSS method by analyzing mean cross-correlation value in the time - frequency domain of the imitated signal and actual whistle signal.

• Journal of Science of Art and Design
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• v.4
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• pp.123-146
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• 2002

[ $\lceil$ ]The Life of Pigeons$\rfloor$ consists of seven different canvases without a leading image It contains fragments of disassociated ordinary subjects from a capitalistic and consuming society. In this respect, the text itself attains multiple meanings throughout with inner disharmony, disassociation and relationships of differences. The divided seven images look as if they are connected as one and are connected events that are happening at the same time and in similar places. A liberal interpretation of this work is given to viewers when the seven canvases have both relations and gaps at the same time. $\lceil$The Life of Pigeons$\rfloor$ attempts the viewer's disruption through its middle stratum of meaning structure, which is a device for viewers to rearrange and deeply analyze the seven images. As a result, the artist allows the viewers to get lost in self-contradiction. A fundamental formal structure adopting post-modernism and abandoning modernism is what we can detect with detailed analysis of the work. For instance, changing surface style appears by dividing or putting images in obliquely, furthermore it clearly shows that the main subject is divided in form such as the subject's division into seven spaces. There are three major characteristics. First, the form of the images is divided and composed through oblique and overlapped images. Second, the main content of the subject tends to be scattered. Third, the subjects are interpreted in multiple meanings due to their allegory and symbolism. The inquiry of $\lceil$The Life of Pigeons$\rfloor$ proves that it takes a post artistic spirituality as its basis and its subjects are divided by the differences and surrounding relationships.

• The Journal of the Acoustical Society of Korea
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• v.38 no.5
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• pp.580-586
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• 2019

In this paper, we propose a biomimetic communication method using a dolphin whistle to covertly transmit the communication signal. A conventional CSS (Chirp Spread Spectrum) modulation technique divides dolphin whistle into several slots and modulates with up and down chirp signals. That causes the time-frequency characteristic difference between the original dolphin whistle and the camouflage performance is degraded. In this paper, we propose a delay based modulation scheme to eliminate distortions. The simulation results show that the bit error rate of the proposed method is better performance than that of the conventional CSS modulation method by about 3.5 dB to 8 dB. And the camouflage performance that evaluated through the cross correlation in the time-frequency domain is also better than that of the CSS modulation method.