• The Journal of the Korea Contents Association
• /
• v.20 no.5
• /
• pp.1-10
• /
• 2020

In this paper, we propose a new pornographic content detection scheme using bi-directional relationships between neighboring auditory signals in order to accurately detect sound-centered obscene contents that are rapidly spreading via the Internet. To capture the bi-directional relationships between neighboring signals, we design a multilayered bi-directional dilated-causal convolution network by stacking several dilated-causal convolution blocks each of which performs bi-directional dilated-causal convolution operations. To verify the performance of the proposed scheme, we compare its accuracy to those of the previous two schemes each of which uses simple auditory feature vectors with a support vector machine and uses only the forward relationships in audio signals by a previous stack of dilated-causal convolution layers. As the results, the proposed scheme produces an accuracy of up to 84.38% that is superior performance up to 25.80% than other two comparison schemes.

• Journal of Broadcast Engineering
• /
• v.15 no.5
• /
• pp.632-641
• /
• 2010

This paper shows the research about the personalized broadcasting system. The personalized broadcasting is the service that users only show the programs which they want to watch when they want to watch these. The purpose of the bi-directional broadcasting service is supporting more satisfied and more personalized services by permitting the bi-directional data transformation. This research also develops the user profiling system for the bi-directional and personalized broadcasting service. This system applied the TV-Anytime metadata specifications which is the standard for the personalized broadcasting services, the system supports the various functions for the bi-directionl and personalized broadcasting such as the user profiling, contents metadata and targeting advertisement services. The bi-directional and personalized broadcasting system increases the users' satisfaction with the recommendation and management of the personally favorite broadcasting contents and advertisements, the trial run results show that the services raise the users' satisfaction with the intelligent and discriminating broadcasting services.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.28 no.5C
• /
• pp.303-311
• /
• 2008

In the case of bi-directional high pressure pile load test with double-acting jack, the shortcomings of bi-directional pile load test with single-acting jack could be solved, low-cost of test could be sure, the limits of loading capacity could be overcome and quality assurance of service plie could be confirmed. In this study, to confirm the stability, the reliability and the application of bi-directional high pressure pile load test with double-acting jack, the calibration test for high pressure oil jacks, the length of high pressure hose and tunable high pressure pipe system were performed. As a result, credibility was very high because the reliability of test results was approached at about 1.0.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.27 no.5
• /
• pp.1129-1140
• /
• 2017

Unidirectional data transmission system, which allows physical one way transmission, removes the backward link physically to prevent the intrusion from the outside through the network. However, the system is difficult to apply to the environment requiring either backward transmissions or bi-directional communications. In this paper, we proposed Limited Two-way communications system, called as LimTway, which only allows outbound TCP two-way communications. LimTway uses two one-way links(forward, backward). While the forward one-way link is staying to be activated so that an allowed outbound UDP traffic could be transmitted one-way always, the backward one-way link is activated while allowed outbound TCP sessions are established. In order to prevent the intrusion from the outside during the period, the software of LimTway is designed to allow only the transmissions of both outbound TCP two-way communication traffics and outbound UDP traffics.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2006.05a
• /
• pp.733-736
• /
• 2006

'디지털 컨버전스'의 물결로 기기들의 통합 과정에서 표준화 된 사용자 인터페이스에 대한 가이드가 필요하다. 본 논문은 다채널과 양방향성, 많은 컨텐츠의 제공이라는 특성을 지닌 디지털 양방향 방송의 효과적인 시청을 위하여 EPG를 중심으로 인터페이스의 요소를 연구한다. 사용성 관점에서 기존 매체의 인터페이스 요소를 정의하고, 이 정의를 기반으로 사용자의 요구 분석에 근거하여 디지털 양방향 방송에 적합한 인터페이스 요소를 새롭게 도출하고 제안한다. 그리고 도출한 요소를 바탕으로 가상의 시나리오를 통해 서비스를 이해한다.

• Journal of the Korean Geotechnical Society
• /
• v.23 no.6
• /
• pp.23-36
• /
• 2007

To overcome the limits of the static pile load test for large diameter drilled shafts, bi-directional low pressure pile load test (BDL PLT) has been used but this test method containes some problems that has not been solved basically. That is, BDL PLT has some problems: difficulty in jack (or cell) arrangement for large test capacity, void remain inside jack (or cell) due to the unrecovery of piston after test etc. In this study, bi-directional double-acting high pressure pile load test (BDH PLT W/DOJ) was developed and confirmed for a in-situ large diameter drilled shaft. At present, test specification of bi-directional pile load test (BDPLT) is being made, and severed main issues (such as, test kinds, test capacity, necessity of use of double-acting and attention of application to service pile) will be contained at the specification.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2013.11a
• /
• pp.715-718
• /
• 2013

단방향 통신을 하는 기존의 전력망에서 할 수 없었던 전력수요 모니터링, 신재생 에너지 활성화 등이 가능하도록 소비자와 전력 사업자간의 양방향 통신을 하는 스마트그리드의 관심이 증가하고 있다. 스마트그리드는 기존 전력망에 IT기술을 접목하여 전력 사업자와 소비자 간의 양방향 통신이 가능하기 때문에 전력 사용에 대한 실시간 모니터링을 하며 안정적인 전력을 공급할 수 있고 생산량이 불안정한 신재생 에너지를 효율적으로 관리 할 수 있는 장점을 갖고 있다. 하지만 양방향 통신을 위해 공개망과 연계되면서 기존의 공개망이 갖고 있는 정보 변조, 위장 공격 등의 보안위협이 그대로 발생할 수 있다. 따라서 본 논문에서는 스마트카드를 이용한 인증을 통해 스마트그리드 환경에서 전송되는 정보에 대한 위장이나 조작 등의 보안위협으로부터 보호할 수 있는 기법을 제안한다.

• Transactions of the Korean Society of Mechanical Engineers B
• /
• v.36 no.12
• /
• pp.1141-1150
• /
• 2012

This paper describes the shape optimization of impeller blades for an anti-heeling bidirectional axial flow pump used in ships. In general, a bidirectional axial pump has efficiency much lower than that of a classical unidirectional pump because of the symmetry of the blade type. In this study, by focusing on a pump impeller, the shape of the blades is redesigned to develop a bidirectional axial pump with higher efficiency. The commercial code employed in this simulation is CFX v.13. The CFD result of the pump torque, head, and hydraulic efficiency was compared. The orthogonal array (OA) and analysis of variance (ANOVA) techniques and surrogate-model-based optimization using orthogonal polynomials are employed to determine the main effects and their optimal design variables. According to the optimal design, we confirm an effective design variable for impeller blades and explain the optimal solution as well as the usefulness of satisfying the constraints of the pump torque and head.

• Korea Information Processing Society Review
• /
• v.11 no.1
• /
• pp.84-92
• /
• 2004

최근 방송, 통신, 컴퓨터를 융합한 디지털 기술의 급속한 발전으로 방송사업자가 기존의 단방향 방송서비스 제공에서 벗어나 시청자가 참여할 수 있는 TV-Commerce, 양방향 광고, TV-AnyTime, 주문형 비디오(VOD) 등의 사용자 요구 중심의 다양한 양방향 방송서비스를 제공할 수 있게 되었다.(중략)

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.9 no.5
• /
• pp.7-13
• /
• 2009

In This Paper, we propose relay schemes for network-coding based two-way relay communication in multi relay channel. Two-way relay channel communication is a bi-directional communication that two users exchange their data with the help of a relay. Network-coding based Two-way relay communication can achieve more throughput compared to conventional two-way relay communication. In this paper, we propose relay selection schemes to provide maximum performance considering instantaneous signal-to-noise in multi-relay channel. Simulation results show that the proposed relay selection schemes can provide diversity order according to the number of relays.