• Journal of KIISE:Computing Practices and Letters
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• v.6 no.2
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• pp.187-195
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• 2000

Embedded software generates its outputs using current states of the system as well as external inputs. When a module in embedded software is tested, we need an automated testing tool, which generates possible sequences to reach the module as well as input data of the module, to reduce the testing time and to improve the quality of software. In this paper, we use decision table to specify the functionality of the module and data-annotated MSC (Message Sequence Charts) to describe scenarios, and implement a tool, which we call MSCTest, to automate the testing process. MSCTest consists of MSC graphic editor, test sequence and data generator, and test driver generator. MSCTest is effectively applied to test EsWin which is a kind of window library used in embedded systems.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.35 no.4B
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• pp.687-694
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• 2010

IPTV(Internet Protocol Television) is an emerging technology in which telecommunication and broadcasting technologies are converged. IPTV service providers usually multicast scrambled contents. And only legitimate subscribers who pass the access control can de-scramble and use the contents. In order to ensure revenues, providers oftentimes employ password-based authentication protocols that ensure secure authentication processes between set-top box and smart card. In this paper, we propose a fingerprint-based 1-out-of-n authentication protocol which provides convenient and more secure authentication process in some organizational environments. The proposed scheme shows that only those who provide legitimate fingerprint information can be authenticated even in a situation that both password and smart card are compromised.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.33 no.6A
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• pp.676-684
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• 2008

In digital video broadcasting-terrestrial (DVB-T), which is the European digital terrestrial television standard, the orthogonal frequency division multiplexing (OFDM) has been adopted for signal transmission. The main reasons using OFDM are to increase the robustness against the frequency selective fading and impulse noise, and to use available bandwidth efficiently. However, channel variation within an OFDM symbol destroys orthogonality between subcarriers, resulting in inter-carrier interference (ICI), which increases an error floor in proportional to maximum Doppler spread. This paper provides an ICI analysis in both time and frequency domains while existing literatures analyze the ICI effects mainly in frequency domain and proposes the algorithms that estimate the channel impulse response and channel variation using least square (LS) algorithm which is the most simple channel estimation technique. And we propose adaptive channel estimation algorithm that estimates the velocity of terminals. The simulation results show that proposed algorithm has similar performance with about 1.5% computational complexity of noise and ICI reduction LS algorithm in low speed environments.

• Trans-
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• v.1
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• pp.91-116
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• 2016

The theme of this research is the music visualization on stage. As the collaborated work, combining the dance, images with the Isang Yun's music, is showing the staged music, which is expressing the music not only through the sound but also the visualization. In the process of visualizing the music through the body and images on the stage, Isang Yun's musics are recreated in the hand of today's artists. The study found that the recreated work from the new point of view, like Interview with Isang Yun can be the bridge between the composer and today's artists and we can see the future through it. Even though, this paper analyzed the work through the aspects of dance and images, the main theme of the work is focusing how can we deliver the music in the new representative form through formative visualization on the stage.

• Journal of Broadcast Engineering
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• v.12 no.3
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• pp.242-249
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• 2007

Recently, International Telecommunication Union approved several methods for objective video quality measurements to be included in international standards. These methods are mainly developed to measure quality of digital video on professional CRT monitors. In this paper, we performed subjective tests in order to examine the applicability of the standard quality assessment methods for different display monitors such as common CRT, PDP, and LCD TV monitors as well as professional CRT monitors. Subjective testing on different display monitors shows that there exist relatively high correlations between the various display monitors, which indicates the standard quality assessment methods can be used on the display monitors under the given conditions of subjective duality assessment.

• Journal of Broadcast Engineering
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• v.22 no.1
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• pp.95-106
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• 2017

Interest in companion screen services and high-definition television broadcasting services are rising along with the advanced of digital broadcasting communication technology. Not only providing good-quality broadcasting services in the main screen, but also creating added values of companion services in the secondary screen are important. In this paper we suggest a platform and a related authoring tool generating adaptive companion screen services according to user contexts. The Platform providing adaptive companion screen services based on user environment is designed and implemented for real service market. Proposed platform organizes a higher quality content service considering both user contexts and demands of service providers in real time, and the related authoring tool enables a novice user interface designer and service director to make adaptive user interfaces quickly and easily. We developed and simulated this platform in accordance with Korean UHD IBB standard which provides interactive service applications.

• The Journal of the Korea Contents Association
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• v.15 no.5
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• pp.142-150
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• 2015

This study examines the effect of changes in the content distribution strategy on VOD usage by comparing the VOD usage pattern following the changes in the IPTV and Digital Cable SVOD holdback policy. The result of this study shows that after changing the SVOD holdback from one week to three weeks, the VOD usage decreased up to 50 percent while paid VOD revenue increased as a result of the rise in PPM. The time series analysis shows statistical decrease in the number of SVOD usage, SVOD usage per user, and PPV revenue per user while VOD revenue per user increased significantly. Moreover, SVOD usage within the drama genres such as mini-series, weekend series, weekend special series, and sitcom decreased significantly. This research provides a case study on the effect of the broadcaster's content distribution policy on the VOD user behavior thus proposing broadcasters and platform operators the ways of establishing distribution strategy as well as invigorating the VOD usage.

• Korean journal of communication and information
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• v.21
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• pp.35-62
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• 2003

This study is conducted to achieve following two purposes. First, this study investigates domestic conditions and problems of data broadcasting industry. Second, this study suggests the improving way of the legal and administrative systems in order to promote domestic data broadcasting industry. Survey was conducted with 16 companies and a few business men for gaining data of general condition and analyzing problems about domestic data broadcasting industry. The results are as follow: first, domestic industry was suffering from the lack of man power, finance, and the delay of data broadcasting service schedule. Second, respondents argued there was no the legal basis and the systematic regulation under the current digital broadcasting policy of government. To resolve those problems, this paper proposed the making laws preparing for the fusion service of communication and broadcasting, systematic assistance of government, the way of technology development and technical standardization, and the way of constructing infrastructure and cultivating man power.

• Journal of the Korean Professional Engineers Association
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• v.37 no.2
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• pp.34-36
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• 2004

우리나라의 과학기술은 지난 40여년간 국가 산업발전에 발맞춰 고도성장을 효과적으로 뒷받침, '60-'70년대 모방$.$학습단계 '80년도 내재화단계를 거쳐 '90년대이후 신기술 개발경쟁에 뛰어드는 혁신단계로 진입, 장기간의 과감한 투자로 과학기술역량이 급신장, 연구개발비 '67년 48억\$\longrightarrow$'02년 17조 3,251억원(세계 6위), 연구원수 '68년 5,024명 \$\longrightarrow$'02년 18만 9,888명(세계 9위), 미국내 특허출원 10년간 평균증가율 32%(OECD 국가중 1위) SCI 논문게재수 5년간 평균증가율 15%(세계4위), 그러나 선진국과 비교할 때 양적$.$질적으로 미흡, '02년을 기준으로, 연구개발투자는 미국의 1/20, 일본의 1/10, 독일의 1/3수준에 불과, '01년 기준 상위 20개 기업의 연구개발비 총액은 50억불 정도로, Ford(74억불), GM(62억불)보다 적음, 인구 천명당 연구원 수 (2,98명)도 주요국에 비해 부족 일본 7.07명, 러시아 6.98명, 독일 5.90명, 대만 4.77('01년, IMD), 특히 신성장산업의 창출과 산업의 고도화에 직결되는 핵심원천기술이 취약, SCI 게재논문수는 세계 14위이나, 논문의 질적 수준을 나타내는 피인용도는 세계 31위('02년), 10대 성장동력 10대 산업과 관련되는 핵심기술의 평균 기술수준은 최고 대비 69.8%, 기술격차는 4.2년 - 디지털 TV/방송산업 74.9%/기술격차 3.1년, - 바이오 신약/장기 산업 61.2% 수준, 과학기술 및 과학기술자에 대한 사회적 인식이 낮음, 이공계 출신의 사회 각 분야 지도층 진출비율이 매우 낮음(16대 국회의원 8%, 3급이상 국가공무원중 기술직 비율 17.1% 등), - 민간의 경우, 10대 기업 임원의 53%가 이공계 출신, 100대 기업 CEO의 38.4%가 이공계 출신, 대입수능시험에서 자연계 지원비율이 감소 -40.1%('99)\$\longrightarrow$34.7%('00)\$\longrightarrow$29.4%('01)\$\longrightarrow$26.9%('02)\$\longrightarrow$30.3%('03)\$\longrightarrow$31.5%\$\longrightarrow$'04)

• Journal of Environmental Science International
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• v.29 no.5
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• pp.575-578
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• 2020

The plasma cortisol of nurserypigs was examined using an outdoor efficacy testwith a digital content-based approach in animal welfare convergence types. Nine nurserypigs,without discriminating between female and male, were classified into 2 groups of 3 pigs each: control and group 1 (effect+nature), control and group 2(effect+nature+music). The control group was the same for group 1 and 2 to compare the effects using a t-test. There was no significant difference in plasma cortisol levels between the control group and group 1 until 4 h after stress induction. However, significant differences were subsequently found between the control group and group 1 from 8 h to 72 h (p<0.05). Further, plasma cortisol was not affected in group 2 at 0 h through 8 h and 72 h. At 12 h through 48 h, group 2 showed a reduction in plasma cortisol level compared to the control group(p<0.05). These results indicated that after stress induction, applying effect plus nature or effect plus nature plus music can effectively decrease plasma cortisol levels in nursery pigs within8 h through 72 h and may serve as a better model for digital content-based approach in animal welfare convergence types.