• BMB Reports
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• 제44권2호
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• pp.107-112
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• 2011

We have developed a biologist-friendly, stand-alone Java GUI application, IdBean, for ID conversion. Our tool integrated most of the widely used ID conversion services that provide programmatic access. It is the first GUI ID conversion application that supports the direct merging as well as comparison of conversion results from multiple ID conversion services without manual effort. This tool will greatly help biologists who handle multiple ID types for the analyses of gene or gene product lists. By referring to multiple conversion services, the number of failed IDs can be reduced. By accessing ID conversion service online, it will potentially provide the most up-to-date conversion results. The application was developed in modular form; however, it can be re-packaged into plug-in form. For the development of a bioinformatics analysis tool, the module can be used as a built-in ID conversion component. It is available at http://neon.gachon.ac.kr/IdBean/.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.321-324
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• 2002

For a rule-based conversion of Hangout into the Roman alphabet rather than a word-for-word conversion, one must come up with a faultless model for the Korean standard pronunciation rules, which are the basis of the Romanization. It is on this foundation that the Korean-Roman alphabet conversion table can be created. For linguistic modeling using PetriNet, modeling boundary and notation of modeling can be defined. In order to describe PetriNet, which is a dynamic modeling tool, as a static one, one can model the standard Korean pronunciation rules and the Hangout-Roman alphabet notation by conversion into incident matrix Thus, this research attempts to develop a mathematical modeling tool for a natural language using PetriNet, and create a Korean-Roman alphabet conversion table.

• ETRI Journal
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• 제19권4호
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• pp.317-325
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• 1997

A new on-the-fly conversion algorithm is proposed, and high-speed array multipliers with the on-the-fly conversion are presented. The new on-the-fly conversion logic is used to speed up carry-propagate addition at the last stage of multiplication, and provides constant delay independent of the number of input bits. In this paper, the multiplication architecture and the on-the-fly conversion algorithm are presented and discussed in detail. The proposed architecture has multiplication time of (n +1)$t_{FA}$, Where n is the number of input bits and $t_{FA}$ is the delay of a full adder. According to our comparative performance evaluation, the proposed architecture has shorter delay and requires less area than the conventional array multiplier with on-the-fly conversion.

• 한국재료학회지
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• 제25권9호
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• pp.475-479
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• 2015

$YNbO_4:Yb^{3+}/Er^{3+}$ is synthesized using a solid-state reaction process with a LiCl flux. The effects of the Er/(Yb+Er) ratios ($R_{Er}$) on the up-conversion (UC) and down-conversion (DC) spectra are investigated. The XRD data confirm that the $Yb^{3+}$ and $Er^{3+}$ ions are fully substituted for the $Y^{3+}$ sites. The UC emission spectra activated by 980 nm consists of green and red emission bands, which originate from the $Er^{3+}$ ions through an energy transfer (ET) process from $Yb^{3+}$ to $Er^{3+}$. The UC emission intensity depends on the $R_{Er}$ value, and the findings demonstrate that $R_{Er}{\leq}0.14$ is suitable for an effective UC process. The DC emission spectra under 269 nm radiation of the synthesized powders exhibits not only a strong blue emission assigned to the $[NbO_4]^{3-}$ niobates, but also green peaks that originate from the $Er^{3+}$ ions through an ET process between $[NbO_4]^{3-}$ and $Er^{3+}$.

• 한국수소및신에너지학회논문집
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• 제25권2호
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• pp.209-217
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• 2014

To enhance the performance of SEWGS system by holding the WGS catalyst in a SEWGS reactor, a spring type bed insert was developed. In this study, effects of operating variables such as steam/CO ratio, gas velocity, syngas concentration on CO conversion were investigated in a fluidized bed reactor using the spring type bed insert to hold the WGS catalyst as tablet shape. CO conversion increased initially as the steam/CO ratio increased. But further increment of the steam/CO ratio caused decreasing of CO conversion because of increment of gas velocity and decrement of syngas concentration. Moreover, CO conversion decreased as the gas velocity increased and the syngas concentration decreased at the same steam/CO ratio. Continuous operation up to 48 hours (2 days) was carried out to check reactivity decay of WGS catalyst supported by spring type bed insert. The average CO conversion was 99.04% and we could conclude that the WGS reactivity at those conditions was maintained up to 48 hours.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1566-1577
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• 2015

A novel high step-up converter is presented herein, which combines the conventional buck-boost converter, the charge pump capacitor and the coupling inductor. By doing so, a quite high voltage conversion ratio due to not only the turns ratio but also the duty cycle, so as to increase design feasibility. It is noted that the denominator of the voltage conversion ratio is the square of one minus duty cycle. Above all, there is no voltage spike across the switch due to the leakage inductance and hence no passive or active snubber is needed, and furthermore, the used switch is driven without isolation and hence the gate driving circuit is relatively simple, thereby upgrading the industrial application capability of this converter. In this paper, the basic operating principles and the associated mathematical deductions are firstly described in detail, and finally some experimental results are provided to demonstrate the effectiveness of the proposed high step-up converter.

• 지식경영연구
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• 제5권2호
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• pp.25-51
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• 2004

The purpose of this study is to investigate the knowledge creating pattern of technology catching-up and pioneering phase in the new product development process. This paper first reviews the knowledge conversion, absorptive capability, learning orientation and the trigger of learning. The paper then presents the integrative model of knowledge creating. Based on the integrative model, in-depth case analysis was conducted on the new product development process in Phicom. As a result, the paper discuss that the pattern of absorptive capability building, knowledge conversion and knowledge transfer is different from technology catching-up and pioneering phase. Finally, the implications and limitations of the study are discussed.

• 방송공학회논문지
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• 제20권2호
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• pp.265-272
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• 2015

폐색영역 탐지(Occlusion detection)와 중간값 필터(Median filter)를 조합한 새로운 움직임 추정 기반의 프레임율 변환(Frame rate up-conversion based on motion estimation) 기술을 소개한다. 움직임 추정은 움직임 벡터(Motion vector)를 얻기 위해 수행한다. 그 후 폐색영역 탐지방법은 폐색된 부분에서 움직임 벡터를 개선한다. 폐색된 영역에서는 잘못된 움직임 벡터를 찾을 가능성이 높으므로 움직임 벡터 의존율이 적은 중간값 필터를 적용하고, 비폐색된 영역에서는 움직임 벡터가 연속적이고 신뢰도가 높으므로 BDMC(Bi-Directional Motion Compensated interpolation)를 적용하여 보간 영상을 생성한다. 양방향 움직임 벡터를 사용하는 BDMC는 움직임 벡터의 연속성과 신뢰도가 높을수록 좋은 결과를 얻는다. 실험결과에서 제안된 알고리즘이 기존의 방법보다 더 나은 성능을 갖는다. 실험에서의 평균 PSNR(Peak signal to noise ratio)은 테스트 시퀀스들에 대하여 BDMC 대비 약 0.16dB 향상되었다.

• 한국전자파학회논문지
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• 제15권5호
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• pp.480-485
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• 2004

본 논문에서는 혼합기의 주파수 상향 변환 동작을 이용한 새로운 전치왜곡 선형화 기법을 제안하였다. 이 선형화 기법은 주파수 상향 혼합 동작을 이용함에도 불구하고 추가적인 신호원을 필요로 하지 않는다. 대신 입력 신호로부터 2차 저주파 혼변조 왜곡 신호를 추출하여 주파수 상향 변환에 필요한 신호원으로 사용하였다. 제안한 전치왜곡 선형화 기법의 타당성을 보이기 위해 주파수가 1.8544 ㎓와 1.8556 ㎓인 2-톤 신호를 개인휴대 통신용 전력 증폭기에 인가하여 22 ㏈m/tone 출력시에 (CR) 비를 26 ㏈ 개선하였으며, 출력 신호레벨을 17 ㏈ 변화시키는 동작 영역에서 (C/I) 비를 20 ㏈ 이상 개선시켰다. 또한 IS-95A 1FA 신호를 인가하여 출력이 26.5 ㏈m일 때 885 KHz 및 1.25 MHz 이격 지점에서 인접 채널 전력비를 각각 10.8 ㏈, 6.4 ㏈ 개선시켰다.

• 방송공학회논문지
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• 제21권4호
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• pp.472-483
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• 2016

본 논문에서는 MC-FRUC(Motion Compensated Frame Rate Up-Conversion) 에서 사용될 수 있는 주파수 영역에서의 블로킹 현상(blocking artifacts) 검출 알고리즘을 제안한다. MC-FRUC 알고리즘은 블록 단위로 움직임 벡터를 계산하여 움직임 보상을 수행함으로써 블록 경계선 주변에서 블로킹 현상이 발생할 수 있다. 본 논문에서는 효율적인 블로킹 현상 검출을 위해 보간된 영상(interpolated frame)의 주파수 성분을 분석하여 블록경계에서 블록킹 현상을 감소시킨다. 실험결과에서 제안된 알고리즘이 기존의 FRUC 방법보다 더 나은 주관적 화질을 보인다. 제안한 방법은 또한 기존의 BDMC(Bi-Directional Motion Compensation) 대비 평균 약 0.45 dB PSNR(Peak Signal to Noise Ratio)이 향상되었다.