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이영록(Youngrok Lee),전치혁(Chi-Hyuck Jun) 대한산업공학회 2009 대한산업공학회 추계학술대회논문집 Vol.2009 No.10
Bicluster analysis is an unsupervised learning method to detect uniquely characterized two-way subsets of objects and attributes from a data set. This paper is to investigate a validation method of bicluster solutions based on a stability index measuring the degrees of reproducibility against the variation of the input data set. By comparing a bicluster solution obtained from the original input data set with bicluster solutions from randomly re-sampled data sets, we quantify the stability of the bicluster solution. Experiments with artificial and real data sets are performed to validate the proposed method.
이정화(Lee, Jeonghwa),이영록(Lee, Youngrok),전치혁(Jun, Chi-Hyuck) 대한산업공학회 2009 대한산업공학회 춘계학술대회논문집 Vol.2009 No.5
Biclustering is the method that clusters objects and features simultaneously. It is usually used to analysis of microarray data, which consists of genes and conditions. Common biclustering algorithms ignore sequential relation between time points. But for time series data time sequence should be maintained in a bicluster solution for useful meaning. So, this paper proposes a new biclustering algorithm for time series data based on the binary least square algorithm.
김수용,이영록,양진국,Kim, Sooyong,Lee, Youngrok,Yang, Jinkook 한국건설관리학회 2015 건설관리 : 한국건설관리학회 학회지 Vol.16 No.3
건설 프로젝트의 VE는 크게 설계단계 VE와 시공단계 VE로 분류된다. 설계단계 VE는 정부의 법률에 의해 100억 원 이상의 공공 건설공사에 적용해야만 한다. 따라서 설계VE는 건설 프로젝트에 적극적으로 적용되고 있다. 이와는 대조적으로, 시공 VE는 제한된 특정 건설 프로젝트에 적용되고 있다. 그 이유는 시공 VE 프로세스가 실무적 요구 품질을 반영 할 수 없기 때문이다. 시공 VE는 시공 가능성에 대한 타당성 검증을 통해 긍정적인 효과를 구현할 수 있다. 이에 본 연구에서는 실무를 반영한 시공 VE의 방법을 제안하고자 한다. 제안 방법은 직관지수(G.F.I.)를 활용한 전문가 기반의 대안평가 방법이며, 제안 방법의 적용성을 검증하기 위해 실무사례에 적용하였다. 그 결과 제안된 대안평가 방법은 기존의 방법보다 적용 절차, 적용 방법 측면에서 효율성이 높은 것으로 나타났다. Value engineering (VE) of the construction project is classified into design phase value engineering and construction phase value engineering. Design phase value engineering must apply to over 10 billion public construction projects by government law. Therefore, the design value engineering apply to actively in construction projects. In contrast, the construction value engineering apply to a limited certain construction project. The reason is that construction value engineering process can not reflect practical demands quality. The construction value engineering can implement to positive impact through the feasibility verification for constructability. In this research, we propose a method of construction value engineering that reflect the practical demands. This method is experts alternative evaluation of using by GFI-based. And, this study was applied to the practical cases to verify the applicability of the proposed method. As a result, proposed alternative evaluation method were analyzed highly efficient in terms of applying the process as well as the method compare to the conventional method.
이정화(Lee, Jeonghwa),이영록(Lee, Youngrok),전치혁(Jun, Chi-Hyuck) 한국경영과학회 2009 한국경영과학회 학술대회논문집 Vol.2009 No.5
Biclustering is the method that clusters objects and features simultaneously. It is usually used to analysis of microarray data, which consists of genes and conditions. Common biclustering algorithms ignore sequential relation between time points. But for time series data time sequence should be maintained in a bicluster solution for useful meaning. So, this paper proposes a new biclustering algorithm for time series data based on the binary least square algorithm.
김윤전,나정화,이영록,성경림,Yoon Jeon Kim,Jung Hwa Na,Youngrok Lee,Kyung Rim Sung 대한안과학회 2012 대한안과학회지 Vol.53 No.7
Purpose: To evaluate the correlations between central corneal thickness (CCT) and optic disc and retinal nerve fiber layer (RNFL) parameters determined by spectral domain optical coherence tomography (SD OCT) and visual field (VF) global indices. Methods: The present study included 151 eyes diagnosed with open-angle glaucoma (OAG) and 135 glaucoma suspect (GS) eyes. The CCT, RNFL thickness, optic disc parameters, and VF global indices were measured. The relationships between CCT and RNFL thickness, optic disc parameters, and VF global indices were assessed by linear regression analysis. Results: Intraocular pressure (IOP, p < 0.001) and VF mean deviation (p = 0.005) in all participants, age (p = 0.017) and IOP (p = 0.003) in the GS group, and IOP (p = 0.002) and inferior RNFL thickness (p = 0.017) in the OAG group were significantly associated with CCT. Among the optic disc parameters, rim area, average cup/disc ratio, and vertical cup/disc ratio were significantly associated with CCT in all participants in the univariate but not multivariate analysis. Conclusions: Optic disc parameters obtained by SD OCT were not correlated with CCT in the OAG or GS group, while RNFL thickness and VF mean deviation showed associations. J Korean Ophthalmol Soc 2012;53(7):1002-1010
이진영,성경림,나정화,이영록,Jin Young Lee,MD,Kyung Rim Sung,MD,PhD,Jung Hwa Na,MD,Youngrok Lee,MD 대한안과학회 2012 대한안과학회지 Vol.53 No.5
Purpose: To evaluate the use of prophylactic antibiotics in glaucoma surgery and the prevalence of postoperative endophthalmitis. Methods: Retrospective medical record review was performed on 136 eyes which underwent glaucoma operation by one surgeon from March 2008 to February 2010 and were followed at least till 6 months postoperatively (glaucoma drainage device implantation; 95 eyes, trabeculectomy; 41 eyes). Results: For intravenous antibiotics injection, 10 eyes used 3rd generation cephalosporin, 54 eyes used 4-fluoroquinolone, 72 eyes used 2nd generation cephalosporin. For oral antibiotics, 125 eyes used 3rd generation cephalosporin, 1 case used 4-fluoroquinolone, and other 10 cases did not use oral antibiotics after the surgery. Total period of systemic antibiotics use showed various distributions with 14 eyes more than 5 days, 115 eyes 4-5 days, and 8 cases less than 4 days. Six eye which used 4-fluoroquinolone and 3 eyes which used cephalosporin showed side effect such as skin lesion and nausea. There has been no single occurrence of endophthalmitis. Conclusions: Various kinds of prophylactic antibiotics were used for glaucoma surgery and the period of antibiotics use was different among patients. However, there has been no single occurrence of endophthalmitis till 6 months postoperative follow up. J Korean Ophthalmol Soc 2012;53(5):647-651