• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.113-116
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• 2000

본 논문에서는 probabilistic principal component analysis (PPCA)를 이용하여 extended maximum a posteriori (EMAP)에 기반한 화자적응 시스템의 성능을 향상시키는 방법을 제시하고자 한다. PPCA는 각각의 hidden Markov model (HMM) 사이의 상관계수 행렬을 강인하게 예측하는데 적용된다. 이렇게 구한 상관계수 행렬은 화자적응 시스템에 사용된다. PPCA는 연산이 효율적이고, EMAP에서 기존에 사용되었던 방법에 비해 향상된 성능을 보여준다. 여러 차례의 음성인식 실험을 통하여, PPCA를 적용한 EMAP은 적은 양의 적응 데이타에서 좋은 성능을 보인다는 것을 확인할 수 있다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.366-367
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• 2017

생체인식 기술의 발달에 의해 생체 인증 수단 또한 늘어남에 따라 사용자의 얼굴을 이용한 인증방법이 점차 실용화 되어가고 있다. 그러나 주변 환경에 제약받을 경우 완벽한 인식률을 보여주지 못하는 경우가 발생한다. 본 논문에서는 기존의 얼굴인식 방법의 오탐지 부분에 대한 개선방법을 제안 하고자 하였다. 디지털 영사식 방법을 통한 무아레 현상을 얼굴인증에 접목시켜 보다 정확한 얼굴 인증을 진행할 수 있도록 개선된 인증 방법을 제시한다.

• The KIPS Transactions:PartA
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• v.9A no.3
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• pp.387-398
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• 2002

As whole genome sequences of many organisms have been revealed by small-scale genome projects, the intensive research on individual genes and their functions has been performed. However on-memory algorithms are inefficient to analysis of whole genome sequences, since the size of individual whole genome is from several million base pairs to hundreds billion base pairs. In order to effectively manipulate the huge sequence data, it is necessary to use the indexed data structure for external memory. In this paper, we introduce a workbench system for analysis and visualization of whole genome sequence using string B-tree that is suitable for analysis of huge data. This system consists of two parts : analysis query part and visualization part. Query system supports various transactions such as sequence search, k-occurrence, and k-mer analysis. Visualization system helps biological scientist to easily understand whole structure and specificity by many kinds of visualization such as whole genome sequence, annotation, CGR (Chaos Game Representation), k-mer, and RWP (Random Walk Plot). One can find the relations among organisms, predict the genes in a genome, and research on the function of junk DNA using our workbench.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• v.4 no.1
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• pp.41-46
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• 2001

Purpose: We studied to know the effect of early feeding on the course and the recovery of acute diarrheal disease. Methods: The study was conducted on 76 patients who admitted to the Soonchunhyang university hospital for acute diarrhea. We divided 76 patients into 3 dietary groups (whole milk group (WMG): 35, diluted milk group (DMG): 29, breast milk group (BMG): 12). We compared three groups by numbers of diarrhea, numbers of vomiting, calory intake, weight increments, and duration of diarrhea. Results: 1) The mean age was $16.45{\pm}18.20$, $11.53{\pm}9.80$, $5.38{\pm}5.01$ months for WMG, DMG, and BMG, respectively. The mean weight was 9 kg and the mean duration of diarrhea was 2.29 days. 2) The numbers of diarrhea during admission was not significantly different in the three groups. 3) The calory intake during admission was significantly low in DMG. 4) The weight increments during admission was significantly low in DMG. 5) The duration of diarrhea during admission was not significantly different in the three gourps. Conclusion: Early refeeding with whole milk or breast milk did not prolong or worsen the course or symptoms of diarrhea compared with gradual reintroduction with diluted milk. But there were advantages of improved nutrition and weight increments. Futher study is necessary to demonstrate the effect of diet according to the causative organisms.

• Proceedings of the KIPE Conference
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• 1998.07a
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• pp.337-341
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• 1998

Brushless DC motors have trapezoidal back emf waveform. Generally, because it is drived by a voltage source inverter, the ideal rectangular phase current is not available and therefore produce torque ripple. In this paper, the torque ripple due to commutation is analysed and the practical method that can reduce the torque ripple is proposed. Simulation and experimental results show the effectiveness of the proposed method.

• 한국데이터정보과학회:학술대회논문집
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• 2003.10a
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• pp.139-145
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• 2003

본 논문에서는 강수 자료의 예측에 사용되는 3-모수 카파 분포(KD3)에서의 모수 추정 방법을 알아보고 시뮬레이션을 통하여 모수 추정 방법에 따른 성능을 비교해 보았다. 이 분포의 모수 $\alpha,\;\beta,\;\mu$를 추정하기 위하여 적률추정법(MME), L-적률 추정법(LME), 최우추정법(MLE)을 적용하였다. 소표본의 경우뿐만 아니라 대표본의 경우에도 시뮬레이션을 통하여 추정법들의 성능을 비교하였다. 적률 추정법과 L-적률 추정법에서는 제약조건 하에서의 1차원 Newton-Raphson방법을 수정하여 이용하였다. MSE를 기준으로 한 시뮬레이션 결과, KD3의 모수 추정에 있어서 표본의 크기가 100보다 작으면 LME의 적용을 추천하고 표본의 크기가 100이상이면 MLE를 추천한다.

• Journal of Korea Society of Industrial Information Systems
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• v.8 no.2
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• pp.45-53
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• 2003

The significances of this paper are of two points. One is that this research develops the query expansion search by adding the related terms based on the dictionary to the original query terms. This method shortens the process of the conventional model of query expansion utilizing the feedback data of the search. The other is that this research tries to find out the optimal point of precisions and recalls by differentiating the weight ratio between original quay and additional terms. This method shows that the efficiency and precision of query expansion search increase.

• The Journal of the Korea Contents Association
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• v.15 no.6
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• pp.24-32
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• 2015

The global success of PSY's Gangnam Style was mediated through combination of YouTube and SNS. PSY's success led into some communication scholars' consideration of new international circulation of Korean pop culture (Korean Trend 2.0). In terms of global circulation of pop culture, it is noticeable how users appropriate YouTube channel beyond mere watching music videos and mere international circulation of Korean pop culture. The mode of fan's activity and appropriation contributes to the expansion of the width and amplification of the volume of Korean popular culture as well. The circulation of pop culture was considered in the level of exchange of tangible commodities such as CD, DVD, and so on until the adoption of digital media and Internet. YouTube has brought new mode in which the international circulation of pop culture is mediated without exchange of tangible commodities but was amplified with the diffusion of network. This study grasps how the mode of users' appropriation contributes to international circulation of pop culture through case studies of some K-pop music videos and international K-pop fans' tribute activities. In terms of theoretical perspective, fandom studies will be examined. In terms of research method, the researcher adopts netnography, a participatory observation on network, to find the feature of fandom and its contribution to the international circulation of pop cultures.

• Journal of the Korean association of regional geographers
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• v.12 no.2
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• pp.305-322
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• 2006

An increasing number of cities employ rescaling strategies that not only construct metropolitan production network scaled down from national context, but also tune up new governance to effectively control local geographies of the city. In this context, urban redevelopment has emerged a key 'global' strategy to empower governmental institutions of the city, which not only eliminate such threatening spatial variables as deteriorated housing, working-class ghettos, and crime areas, but also increase and extract exchange value of those spaces. I view such practices a process of 'glurbanization'. This paper investigates how state/city government employs the discourse of urban re/development for 'inventing' poverty at an urban scale: how it institutionalizes the discourse for implementing concrete projects: and how urban institutional apparatus appropriate their discursive practices of redevelopment for their own ends in the city. By particularly focusing on the California Redevelopment Law and the Community Redevelopment Agency of the City of Los Angeles, this paper analyzes the ways in which the law and the agency extract value from what they define 'blight areas' by means of eminent domain and tax increment revenues. For empirical analysis I employ discourse analysis and institutional ethnography. I conclusively argue that the urban spaces stigmatized as 'blight areas' are increasingly entrapped by the urban redevelopment agency, which extracts increased exchange value from the areas and redirects it for supporting external investors, private developers, and the body of the agency itself.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.49-51
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• 2020

인터넷 상거래의 발전으로 온라인 쇼핑몰은 간편 결제와 같은 다양한 페이들을 지원하며 결제방식에 있어서 다양한 방법들을 제공하고 있다. 한편, 경쟁 우위에 있는 다양한 온라인 앱들은 O2O(Online-to-Offline) 서비스를 기반으로 오프라인 매장에도 진출하고 있다. 반면, 기존의 오프라인 사업장을 가진 소상공인들은 ICT 적용과 활용을 위한 개발에 어려움을 겪고 있을 뿐만 아니라 고객 관리와 광고 등에서도 상대적인 열세로 인하여 오프라인 사업장의 수익은 점점 줄어드는 실정이다. 이러한 문제를 해결하기 위하여 본 논문에서는 블루투스 비콘 기술을 사용하여 고객 관리와 광고 등이 가능하며, 오프라인 사업장에도 적용이 가능한 방법을 제안한다. 제안 방법을 통하여 오프라인 매장에서도 온라인 쇼핑몰처럼 관리가 가능하다.