• Aerospace Engineering and Technology
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• v.6 no.1
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• pp.83-91
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• 2007

An experimental verification of multipactor(MP) discharge for S-band diplexer as a sample DUT for space application by an in-house MP test facility is proposed. The designed diplexer having two BPFs for Rx and Tx is applied to a design of five pole inter-digital cavity type band pass filter with chebyshev response, it has 2.7 % bandwidth centered at 2.232 and 2.055 GHz for Rx, Tx, respectively. To avoid the MP discharge, the accurate design and analysis methods based on 3D EM field analysis are considered. The proposed in-house MP test facility consists of a phase detecting system using a doubly balanced mixer as a simple, low cost and real time MP test method compared with results of previously well-known MP detection systems as cross reference methods. The calculated MP threshold RF input power is 43.13 dBm. The measured one is 43 dBm and 44 dBm for CW, pulsed mode test, respectively.

• The Journal of the Korea Contents Association
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• v.9 no.6
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• pp.126-133
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• 2009

This study examined the relationship of what kind of creative thinking has as factors for emotion design products for consumers focusing on the successful cases of emotion products. For the design creativity attribute used in this experiment, the design evaluation creativity tools revealed in Kim Eun-Ju's 2007 design creativity evaluation tool development were used mostly MP3s, which have various forms, functions and sizes were selected as the target for experiment. Results of the experiment showed that for design creativeness items for MP3 as single products, uniqueness, favorableness and convenience were relevant. Accordingly, the common features of design creativeness items for emotional products were identified. According to the result, for emotional designs, the interest level of uniqueness for the design creativity evaluation items and the functional items for practicality had a high relativity. Therefore, there is a need to examine the common features between the design creativity items for products other than MP3s in the future.

• Journal of Digital Contents Society
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• v.15 no.3
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• pp.357-363
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• 2014

In this paper, we propose a new audio forensic marking system for protecting the copyright of the Internet-based music streaming services. In the proposed method, in order to guarantee the QoS of the streaming service, high speed, and generates a forensic mark inserted MP3 file. We make pre-marking process and generate a new forensic marked MP3 file, a combination of the pre-marked MP3 frame, the inserted user information. Experimental results show that the proposed method satisfactory results robustness and imperceptibility, and real-time properties. In addition, we were confirmed that the real-time embedding and detection from the streaming-based audio forensic marking system that has been implemented on the server/client is possible.

• Venture DIGEST
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• s.91
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• pp.8-9
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• 2006

최근 몇 년간 발전과 혁신을 거듭하며 디지털 문화의 중심으로 자리매김해 온 MP3플레이어. 이제 단순한 MP3플레이어는 경쟁에서 살아남기 어려워졌을 만큼 변화속도가 빨라지고 있다. 디지털기기의‘컨버전스’화 속에 업계는 휴대용 게임기, 포터블미디어플레이어 (PMP), 디지털멀티미디어방송(DMB) 등으로 영역 확대를 시도하는 중이다.

• Journal of Applied Biological Chemistry
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• v.62 no.2
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• pp.157-165
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• 2019

Di- and tri-methylation of lysine 4 on histone H3 (H3K4me2 and H3K4me3, respectively) are epigenetic markers of active genes. Complex associated with Set1 (COMPASS) mediates these H3K4 methylations. The involvement of COMPASS activity in secondary metabolite (SM) biosynthesis was first demonstrated with an Aspergillus nidulans cclA knockout mutant. The cclA knockout induced the transcription of two cryptic SM biosynthetic gene clusters, leading to the production of the cognate SM. Monascus spp. are filamentous fungi that have been used for food fermentation in eastern Asia, and the pigment Monascus azaphione (MAz) is their main SM. Monascus highly produces MAz, implying that the cognate biosynthetic genes are highly active in transcription. In the present study, we examined how COMPASS activity modulates MAz biosynthesis by inactivating Monascus purpureus cclA (Mp-cclA) and swd1 (Mp-swd1). For both ${\Delta}Mp-cclA$ and ${\Delta}Mp-swd1$, a reduction in MAz production, accompanied by an abated cell growth, was observed. Suppression of MAz production was more effective in an agar culture than in the submerged liquid culture. The fidelity of the ${\Delta}Mp-swd1$ phenotypes was verified by restoring the WT-like phenotypes in a reversion recombinant mutant, namely, trpCp: Mp-swd1, that was generated from the ${\Delta}Mp-swd1$ mutant. Real-time quantitative Polymerase chain reaction analysis indicated that the transcription of MAz biosynthetic genes was repressed in the ${\Delta}Mp-swd1$ mutant. This study demonstrated that MAz biosynthesis is under the control of COMPASS activity and that the extent of this regulation is dependent on growth conditions.

• The Journal of Information Systems
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• v.14 no.2
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• pp.257-276
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• 2005

This study adopts diffusion of innovation theory and analyses product life cycle on two different information communication technology (ICT) products. One is telematics located on introduction and the other one is MP3 located on maturity. The analytical results were mixed. ordinary least square (OLS) result showed that adoption of MP3 player is affected by white noise error ($\varepsilon$) and telematics is influenced by innovation effect (p coefficient) rather than imitation effect (q coefficient) or white noise error. However, nonlinear least square (NLS) result showed that adoption of MP3 player is affected by imitation effect (q coefficient) rather than innovation effect (p coefficient). In addition, the ratio of imitation effect/innovation effect of MP3 player is larger than that of telematics.

• Proceedings of the Korea Multimedia Society Conference
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• 2003.05b
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• pp.338-341
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• 2003

최근의 인터넷 음악방송은 MP3 오디오를 기반으로 하는 TCP 프로토콜의 전송방식이 일반적이다. TCP방식의 전송은 HTTP 프로토콜을 이용한 파일 전송방식으로 네트워크의 부하가 급증할 경우 TCP의 특성으로 인해 음악의 끊김 현상이 발생하여 QoS 문제가 발생한다. 본 논문은 실시간 전송방식의 RTP(Real-time Transfer Protocol) 프로토콜을 이용하여 MP3 오디오 기반의 생방송 시스템 개발에 대한 연구로서, 기존의 TCP 방식의 음악의 끊김 현상을 개선하기 위한 모듈 구현을 목적으로 한다. 본 연구에서는 MP3 오디오 전송에 따른 QoS(Quality Of Service) 개선을 위하여 인터리빙 기법을 이용한 SPH/RPH(Send Payload Handler/ Receive Payload Handler) 모듈을 구현하였다.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.8
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• pp.45-52
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• 2013

Coordinated Multi-Point (CoMP) is considered as a technology in the 3rd Generation Partnership Project(3GPP) Long Term Evolution-Advanced (LTE-A) system. In this paper, we design and analyze the performance of the Coordinated Beamforming (CB) technique, which is one major category of CoMP. We perform Monte Carlo simulations with a Heterogeneous Network (HetNet) in LTE-A, and confirm the performance through a graph of the Cumulative Distribution Function (CDF). From the simulation results, we show significant performance gain with the CoMP technique, and better performance when we apply various schemes of scheduling and precoding.

• The Journal of Asian Finance, Economics and Business
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• v.9 no.3
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• pp.295-302
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• 2022

This research aims to determine and analyze: (a) the effects of digital marketing activity (DMAc), digital marketing capability (DMC), and Digital marketing asset (DMA), (b) the effects of DMAc, DMC, and DMA on marketing performance (MP), (c). the effects of entrepreneurial orientation (OE) on MP and (d). the mediating role of OA on the effects of DMAc, DMC, and DMA on OE. The research population is all the small enterprise actors in Kendari city applying digital marketing and having a permanent establishment in Kendari City. The analysis tool used is SEM Partial Least Square. Results of the research show that: (a). DMC and DMA have positive and significant effects on OE while DMAc is found to be insignificant on OE, (b). then, DMAc and DMA have positive and significant effects on MP, and DMC is found to be insignificantly increasing MP, (c). OE has positive and significant effects on MP and (d). DMC effects on MP and effects between DMA and MP are mediated by OE, whereas DMA effects on MP are not mediated by OE position. Based on research findings, DMC and DMA are superior at forming research opinions since they have a substantial influence on enhancing collaboration.

• The Journal of the Acoustical Society of Korea
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• v.32 no.1
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• pp.64-70
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• 2013

In this paper, we suggest a new audio watermarking method for audio contents copyrights that can efficiently provide protection from MP3 compression attacks. Watermarks were inserted at the coefficients repeatedly from low frequencies to high frequencies after DCT transform in commonly used Cox's spread spectrum method. Because the methods using arbitrary coefficients are not effective, we use the new weight functions that make small losses for the watermark coefficients during attacks, using psychological acoustics. In the results of various sound clips, the suggested method had overall better outcomes than the Cox's method by preserving watermarks and reducing distortions of the original sounds.