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ISO 13790 한국형 유효계수 결정 방법론에 관한 연구
이득환(Deuk-Hwan Lee),최현웅(Hyun-Woong Choi),강소라(So-Ra Kang),유호경(Ho-Kyung Yu),김재민(Jae-Min Kim) 한국건축친환경설비학회 2014 한국건축친환경설비학회 논문집 Vol.8 No.3
Utilisation factors used in ISO 13790 are determined by time constant and gain/loss ratios and should be redefined for climate condition to improve the accuracy of the heating/cooling loads in each region or country. The purpose of this study is to suggest reference time constants and dimensionless reference numerical parameters which are applicable for buildings in Korean context. Using Energy plus detailed simulation models were made representing high weight/high insulated rooms surrounded by external environment and a light weight (curtain wall type) room adjacent to internal environment. Equivalent models were made with an ISO 13790-based calculation tool in which numerous combinations of reference time constants and dimensionless reference numerical parameters can be tested. After examining the agreement between results from Energy plus simulation and those of the ISO 13790-based tool, a set of reference time constants and dimensionless reference numerical parameters are suggested which reduce the error rates significantly. This paper presents the methodology of new utilisation factors calculation and outcomes of the examination.
건물 구조체에 따른 히트펌프 시스템 계절별 에너지 효율 계수
이득환(Lee Deuk-Hwan),유호경(Yu Ho-Kyung),한세희(Han Sae-Hee),최현웅(Choi-Hyun Woong),김재민(Kim Jae-Min) 한국건축친환경설비학회 2013 한국건축친환경설비학회 논문집 Vol.7 No.4
While nominal COPs which are determined under a steady static condition cannot represent the actual system efficiency of heat pumps, seasonal energy efficiency ratings (SEER) are used for the more realistic performance assessment. SEERs are calculated by taking account of building energy partial load patterns which are determined by outdoor temperature bin and simplied heating/cooling load calculation. Although SEERs could be used for the assessment of the system performance, it is questionable that the nature of the simplified calculation provides accep accuracy of the results taking account of building configuration(e.g. thermal capacity, window ratio etc), regional climate conditions etc). The purpose of this study is to test the applicability of SEERs of heat pump systems integrated within a building. The KS C 9306 method for calculating SEERs was investigated and used for the comparison analysis with the detailed simulation tool Energyplus in terms of system efficiency rates according to the partial load profiles.
이득환 ( Deuk Hwan Lee ),강형구 ( Hyoung Goo Kang ),김수현 ( Soo Hyun Kim ),이창민 ( Chang Min Lee ) 한국금융공학회 2013 금융공학연구 Vol.12 No.2
본 연구는 2011년 1월 1일부터 2013년 1월 4일까지 빅데이터(Big-data)에 나타난 9가지 감성(Sentiment)들의 특징을 자세히 살펴보았다. 기존에는 감성들의 추출에 대한 어려움으로 인해 감성들이 실제 주식 시장에 끼칠 수 있는 영향력이 등한시 되어 있는 실정이다. 본 연구에서는 Daum-soft에서 제공 받은 감성 자료를 대상으로 자기상관 분석, 주성분 분석, VAR 추정을 실시하여 감성이 가지고 있는 특징을 실증 분석한다. 그 결과 감성들은 일정한 패턴을 가지고 있음을 확인 할 수 있었다. 즉, 자기상관분석 결과 감성들의 자기회귀성과 주기를 확인 할 수 있었으며 주성분 분석 결과 9가지 감성들이 긍정성, 부정성으로 묶일 수 있음을 보였다. 마지막으로 VAR분석을 통해 음의 자기회귀 계수를 가짐을 알 수 있었으며 상호 다양한 시차에서 영향을 주고받음을 확인 할 수 있었다. 이는 빅데이터(Big-data)에 나타난 주가 정보를 담고 있는 감성들은 무작위적인 정보의 나열이 아니라 주식시장과 흐름을 같이 하고 있으며 과거값을 통해 예측이 가능함을 시사하고 있다. We study thoroughly by looking into nine different sentiments found in approximately 190 million pieces of Big-data gained from January 1st, 2011 to January 4th, 2013. In the past, it was not easy to extract the sentiments and because of that, until now, any influences that the sentiments could actually have on the stock market have been neglecting. In the study, with the sentiment references provided by Daum-soft, features of the sentiments were examined by autocorrelation analysis, principle component analysis and VAR. According to the results, we find that the sentiments are observed to have some regular patterns. In other words, the findings from the autocorrelation analysis prove autocorrelation and period of the sentiments while the results from the principle component analysis report that the nine sentiments could be connected with positivity and negativity. Lastly, via VAR, the sentiments appeare to have negative autoregressive parameters as they would be affected by each other at various lag-times. Those results from the analyses indicate that the sentiments with stock information appearing on Big-data would integrate with changes in the stock market as they can be possibly estimated based on values from the past.
유전 및 육종 : 한우의 유전체 표지인지 활용 개체 혈연관계 추정
김내수 ( Nae Soo Kim ),이득환 ( Deuk Hwan Lee ),조충일 ( Chung Il Cho ) 한국동물자원과학회 ( 구 한국축산학회 ) 2010 한국축산학회지 Vol.52 No.5
한우의 유전체 전장의 정보를 Illumina BeadArrayTM Bovine SNP50 assay를 이용하여 단일염기다형 현상을 조사한 결과, 유전적 다양성을 보이는 좌위가 약 32,567 좌위 이상에서 다양성을 보이고 있었으며 약 5,554 좌위에서 다양성이 조사되지 않았다. 이는 조사된 자료의 가계집단의 수가 크게 제한되었기 때문에 기인될 수 있으며 또 다른 원인으로는 한우 종축집단의 크기가 작을 수 있다는 현상을 반증한다고 사료된다. 유전분석의 기초가 되는 혈통기록에 의한 개체간 혈연관계를 유전체 정보에 의한 혈연관계와 비교하여 본 결과, 유전체 정보에 의한 혈연관계의 크기가 혈통기록에 의한 혈연관계보다 좀 더 정확하게 추정될 수 있다는 장점이 있으며 혈통기록상의 오류로 그릇된 혈연관계의 크기를 유전체 정보를 통하여 보완할 수 있다는 장점이 있다. 이러한 장점을 활용하면 유전체정보를 이용한 유전능력 평가의 정확성을 크게 향상시킬 수 있을 것으로 사료되었다. The emergence of next-generation sequencing technologies has lead to application of new computational and statistical methodologies that allow incorporating genetic information from entire genomes of many individuals composing the population. For example, using single-nucleotide polymorphisms (SNP) obtained from whole genome amplification platforms such as the Ilummina BovineSNP50 chip, many researchers are actively engaged in the genetic evaluation of cattle livestock using whole genome relationship analyses. In this study, we estimated the genomic relationship matrix (GRM) and compared it with one computed using a pedigree relationship matrix (PRM) using a population of Hanwoo. This project is a preliminary study that will eventually include future work on genomic selection and prediction. Data used in this study were obtained from 187 blood samples consisting of the progeny of 20 young bulls collected after parentage testing from the Hanwoo improvement center, National Agriculture Cooperative Federation as well as 103 blood samples from the progeny of 12 proven bulls collected from farms around the Kyong-buk area in South Korea. The data set was divided into two cases for analysis. In the first case missing genotypes were included. In the second case missing genotypes were excluded. The effect of missing genotypes on the accuracy of genomic relationship estimation was investigated. Estimation of relationships using genomic information was also carried out chromosome by chromosome for whole genomic SNP markers based on the regression method using allele frequencies across loci. The average correlation coefficient and standard deviation between relationships using pedigree information and chromosomal genomic information using data which was verified using a parentage test andeliminated missing genotypes was 0.81±0.04 and their correlation coefficient when using whole genomic information was 0.98, which was higher. Variation in relationships between non-inbred half sibs was 0.22±0.17 on chromosomal and 0.22±0.04 on whole genomic SNP markers. The variations were larger and unusual values were observed when non-parentage test data were included. So, relationship matrix by genomic information can be useful for genetic evaluation of animal breeding.