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플라이애쉬와 머드를 대체 혼입한 콘크리트의 특성에 관한 실험적 연구
안문기,이정섭,송하영,김을용 大田産業大學校 2002 한밭대학교 논문집 Vol.19 No.-
The purpose of this study is to inverstigate the influence of proportioning methods of fly ash and mud on the workability and the engineering properties of concrete. The main part of this experiment is the comparison and analysis of the basic properties of the concrete replaced and mixed with fly ash and mud. The test items are compressive strength and non-destructive test in hardened concrete, also slump, flow, air contents and mixing temperature in fresh concrete according to W/c, replacement ratio of fly ash and mud. The test results are as follows ; 1) As the increase of replacement ratio of fly ash and mud, the workability of concrete is decrease as compared with the plain concrete. 2) As the increase of replacement ratio of fly ash and mud, the compressive strength of concrete is increase as compared with the plain concrete and the non-destructive test results of concrete are better than the plain concrete.
GPS를 이용한 안드로이드 폰 자동 설정 어플리케이션 (U need Utility)
배현직;박정길;윤상문;이기주;김흥식 인제대학교 2012 仁濟論叢 Vol.27 No.1
Since the Apple's iPhone was released in Korea, many users use any smartphone. Since smartphones launch in Korea, many users change the previous feature phone to smartphone, and its users continue to increase. One of the advantages of smart phones is that user can install a wanted application like the computer, so the demand of applications has been increasing gradually. We are intended to study the development of smartphone application with location information by GPS. Instead of making the result of current location information by informing current position to users or approved third parties by them, we process their information which needs to be used internally them. And we study the application which changes the status of smartphone automatically by position information.
Genetic 알고리즘을 이용한 능선회귀 상수의 결정에 관한 연구
최이선,염준근,정기문 조선대학교 통계연구소 2000 統計硏究所論文誌 Vol.2 No.1
We use biased estimators to detect multicollinerity and ridge regression estimator among biased estimators. Important problem here is determination of ridge constant in ridge regression estimator. To determine ridge constant there is method using variance inflation factor and ridge trace, scree diagram in graphic method. With method using ridge trace and scree diagram it is not easy to find ridge constant. Method using variance inflation factor determine ridge constant when expectation of variance inflation factor is to approximate "1" applying all possible ridge constant between zero and one. In this thesis we propose determination of ridge constant to detect multicollinerity using genetic algorithm. Ridge constant is converged quickly through experiment.
염준근,남기성,정기문 동국대학교 자연과학연구소 1993 자연과학연구 논문집 Vol.13 No.-
고전적인 식별방법은 「masking」효과가 존재할 때 이상치와 영향력 관찰치를 식별하지 못한다. 본 논문에서는 「masking」효과가 존재할 때 영향력 관찰치를 식별하기위한 방법으로 수정된 Mahalanobis 거리를 제안했다. 또한, 「masking」효과가 존재하는 자료를 통하여 수정된 Mahalanobis 거리가 영향력 관찰치를 식별할 수 있음을 보였다. The classical identification method does not find outliers and influential observations when masking effect is presented. This paper proposes to modified Mahalanobis distance for the detection of influential observations when masking observations in dada which are presented masking effect.
임의 절단자료가 있는 선형회귀모형에서의 로버스트 추정량에 관한 연구
염준근,황강진,정기문 동국대학교 자연과학연구원 1995 자연과학연구 논문집 Vol.15 No.-
Koul, Susarla and Van Ryzin(1981) proposed a regression estimator for linear regression models with right censoring. Despite its computational advantages and well-explored theoretical properties, this estimator is not a robust estimator. That is, in case of data including contamination observations its estimator is very poor. We propose a robust estimator using least median of square method and variable transformation. We demonstrate this using simulation data.
A Bayesian Approach to Optimal Replacement Policy for a Repairable System with Warranty Period
Jung, Gi-Mun,Han, Sung-Sil The Korean Statistical Society 2002 Communications for statistical applications and me Vol.9 No.1
This paper considers a Bayesian approach to determine an optimal replacement policy for a repairable system with warranty period. The mathematical formula of the expected cost rate per unit time is obtained for two cases : RFRW(renewing free-replacement warranty) and RPRW(renewing pro-rata warranty). When the failure time is Weibull distribution with uncertain parameters, a Bayesian approach is established to formally express and update the uncertain parameters for determining an optimal replacement policy. Some numerical examples are presented for illustrative purpose.
Proteogenomic Characterization of Human Early-Onset Gastric Cancer
Mun, Dong-Gi,Bhin, Jinhyuk,Kim, Sangok,Kim, Hyunwoo,Jung, Jae Hun,Jung, Yeonjoo,Jang, Ye Eun,Park, Jong Moon,Kim, Hokeun,Jung, Yeonhwa,Lee, Hangyeore,Bae, Jingi,Back, Seunghoon,Kim, Su-Jin,Kim, Jieun Cell Press 2019 Cancer Cell Vol. No.
<P><B>Summary</B></P> <P>We report proteogenomic analysis of diffuse gastric cancers (GCs) in young populations. Phosphoproteome data elucidated signaling pathways associated with somatic mutations based on mutation-phosphorylation correlations. Moreover, correlations between mRNA and protein abundances provided potential oncogenes and tumor suppressors associated with patient survival. Furthermore, integrated clustering of mRNA, protein, phosphorylation, and N-glycosylation data identified four subtypes of diffuse GCs. Distinguishing these subtypes was possible by proteomic data. Four subtypes were associated with proliferation, immune response, metabolism, and invasion, respectively; and associations of the subtypes with immune- and invasion-related pathways were identified mainly by phosphorylation and <I>N</I>-glycosylation data. Therefore, our proteogenomic analysis provides additional information beyond genomic analyses, which can improve understanding of cancer biology and patient stratification in diffuse GCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Mutation-phosphorylation correlation suggests possible signaling interplays in EOGCs </LI> <LI> mRNA-protein correlation suggests genes with high association with patient survival </LI> <LI> Integrated analysis of mRNA and protein data identified four subtypes </LI> <LI> Phosphorylation data provide cellular signaling pathways underlying the subtypes </LI> </UL> </P> <P><B>Graphical Abstract</B></P> <P>[DISPLAY OMISSION]</P>
Importance Analysis for Capacitated Network Systems
Jung, Gi-Mun,Park, Dong-Ho,Lee, Seung-Min The Korean Reliability Society 2001 International Journal of Reliability and Applicati Vol.2 No.1
A network, where links have different capacities, is considered to be in functioning state if a specified amount of flow can be transmitted through the network. In this paper, we consider the measures of importance of a link in such networks. We define the structural importance and reliability importance of a link when the required amount of flow is given. We also present the performability importance, which can be used to determine which links should be improved first in order to make the greatest improvement in the expected maximum flow of network. Numerical examples are presented as well for illustrative purpose.
Cost Optimization of Ineffective Periodic Preventive Maintenance
Jung, Gi-Mun,Park, Dong-Ho,Yum, Joon-Keun The Korean Statistical Society 1999 Communications for statistical applications and me Vol.6 No.1
This paper considers an imperfect repair model for which the repairable system is maintained preventively at periodic times and is replaced by a new system when a predetermined number of preventive maintenance has been applied. our main objective of this is to determine the optimal number of preventive maintenances before the system is replaced and the optimal length of interval between two consecutive preventive maintenances under a new repair model which is referred to as an ineffective preventive maintenance. Such a model assumes a periodic preventive maintenance in which the system is effectively maintained with a certain probability. Otherwise the system is not improved at all after each maintenance and thus the failure rate remains the same as before. The criteria to determine the optimal number of preventive maintenances and length of period is the expected cost rate per unit time for an infinite time span. We give the explicit expressions for the expected cost rate per unit time. Some numerical examples are presented for illustrative purposes.