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H.264 Adaptive Deblocking Filtering with Reduced Hardware Complexity
Sungho Park,Gyounghwan Hyun,Hyuk-Jae Lee 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
This paper proposes a new hardware organization of adaptive deblocking filter (ADF) for an H.264 encoder. Most previous organizations of ADF aim to increase the computation speed at the cost of additional hardware resources. However, the execution speed of ADF in these previous designs is much faster than the other hardware modules in an H.264 chip such as motion estimation. The main aim of the proposed ADF is to balance the computation speed with the other hardware modules while reducing the hardware complexity. In the proposed ADF, SRAM size is reduced to 48x32 bytes and register arrays for transpose operation are removed.
Block-wise Correction of Vignetting Distortion
Sungho Park,Yongseok Jin,Hyuk-Jae Lee 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Vignetting refers to a distortion of an image near the periphery caused by loss of light. To compensate for the vignetting distortion, previous schemes use lookup table to store the distribution of light intensity and use this distribution to correct the distortion. Another previous scheme uses a functional model for the vignetting distortion and correct the distortion based on the model. This model-based correction reduces the memory space to store the lookup table, but it suffers from the reduction of the correction accuracy. This paper combines the previous two approaches by decomposing an image into small blocks, obtaining the functional models for every block, correcting vignetting distortion block by block based on the function models. Experimental results show that a functional model based on the 2<SUP>nd</SUP> order equation with the block size of 64×64 gives a reasonably good trade-off between the required memory space and the correction accuracy.
전자통신수단을 통한 국제물품매매에서의 계약성립에 관한 비교법적 연구: 한국과 EU규범을 중심으로
한국무역학회 2012 貿易學會誌 Vol.37 No.3
<P> 본 연구는 전자적 통신수단을 이용한 국제물품매매거래에서 계약성립에 관한 EU의 법적 규정과 한국법과의 비교분석을 하고 있다. 이를 수행하기 위하여 EU 내에 존재하고 있는 유럽계약법원칙(PECL), 국제상사계약에 관한 UNIDROIT 원칙(PICC), 전자상거래에 관한 EU지침서(EC Directive), 전자서명에 관한 EU지침서(ES Directive) 등의 관련규정들에 대해 살펴보았다. 이 규범들에서 규정하고 있는 전자적 통신수단을 이용한 계약의 성립과 그 법률적 효력에 대해 연구하였으며, 이와 관련하여 한국의 규범인 민법(KCA), 상법(KCOA), 전자서명법(DSA), 전자거래기본법(FAET), 전자무역촉진에 관한 법률(ETFA)들도 함께 조사하여 비교분석하였다.</P>
Ureteral endometriosis: A rare and underdiagnosed cause of renal dysfunction
( Sung Ho Park ),( Sung Taek Park ),( Hong Bae Kim ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
Ureteral endometriosis is associated with deep endometriosis and is relatively uncommon. In some patients, progressive obstruction of the lower part of the ureter may occur, with silent loss of renal function as a consequence. We report on one patient with loss of renal function secondary to ureteral endometriosis. Failure to diagnose deep endometriosis with ureteral involvement and lack of typical symptoms may all be reasons for development of loss of renal function. With only one functional kidney, this patient should be followed closely with renal function tests and ultrasound, and in certain cases also by magnetic resonance imaging or renal scintigraphy.
Sungho Park,Youngjin Park,Seongjin Yim 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Over-actuated feedback control system has advantages of increasing maneuverability and robust performance in fault situation but probability of fault occurrence is also increase because of the increasing the number of actuators and sensors. Furthermore if there has no appropriate fault tolerant strategy, more hazardous accident could occur so fault tolerant strategy is highly emphasized in over-actuated system. In over-actuated system, the number of operable control input is greater than the controlled variable so control input distribution is not unique for achieve same control objectives. In this research, fault diagnoses with inherent over-actuated system characteristic and make controller reconfiguration to achieve robust performance in fault situation. If there are some probabilities to exist fault situation, fault diagnosis system makes input perturbation which satisfied holonomic constraint to achieve same control objective and diagnoses fault components by analysis system response. Because input perturbations satisfy constraint equation, there is no change in system response in normal situation. But if some critical faults are exist, unintended system response could appear. Proposed fault diagnosis method is applied to 4 wheels independently driven vehicle to verify effectiveness of that method and evaluate the performance of fault diagnosis and controller reconfiguration.
Sung Ho Park 韓國海法學會 2009 韓國海法學會誌 Vol.31 No.2
국제상거래는 계약체결 및 이행과정상 다양한 규범들이 적용되고 있다. 본 논문은 형식성에 관한 다양한 국제규범들과 주요국가의 국내규범들의 규정을 비교하고 있다. 비록 대다수의 규범들이 계약성립요건으로 서면성을 요구하고 있진 않지만, 국제상거래는 수많은 서류들에 의해 이행되고 있으며, 또한 특정서류는 형식성을 요구하기도 한다. 서면과 서명은 계약상의 합의내용에 대한 신뢰성을 높이고 계약의 이행과정상에서 발생하는 국제상거래 당사자간의 법적, 문화적 차이에서 오는 혼란을 방지하는데도 일조한다. 국제상거래에서 전자통신수단을 이용할 경우 전자서류가 법적으로 기존의 문서와 동일한 법률적 성질을 가지는지에 대해서는 아직 국제적으로 완전한 합의가 이루어진 것은 아니다. 또한 많은 관련규범들의 규정들도 차이가 있음을 부인할 수 없다. 그러므로 본 논문은 이러한 차이점에 대해 국제상거래계약과 이행과정에서 적용될 수 있는 많은 국제규범들과 미국, 영국, 한국의 관련규범들을 비교분석하고 있다. This article attempts to describe and analyse the relevant provisions on the form requirements in the contracts for sale of goods under selected international and national regulations in a comparative way. International sales transactions are, in general, doing conduct with specific written documents even though most regulations in the world provide a written form is not necessary to make a contract for commercial transactions. Form requirement is needed in some international trade documents. Writing and signature raises a level of certainty and provides a record of the terms of agreement. It also fosters better communications given difference in law, language and culture amongst participants of international trade. When electronic communication means are used for the international sale of goods, it may not be obvious whether an electronic document has legally the same characters and functions as a paper-based document. In addition, although many international instruments relating to e-commerce have been set forth in the last decade, those may no bet exactly same provisions in terms of form requirement. In that respect, this article analyses how to solve the differences of the provisions relating to form requirements in international and national regulations.