통합된 광가입자망 접속구조의 불확실성 요인 분석

황유선,정혜승,이영호,노장래,김영휘 한국경영과학회 1998 한국경영과학회 학술대회논문집 Vol.- No.1

통신망의 광대역화 요구로 인하여 다양한 광가입자망 기술이 제안되었다. 각 기술의 특징으로 인하여 두 가지 이상의 가입자망 기술이 통합된 통합액세스노드시스템으로 가입자망을 전환하는 것에 관한 연구가 활발히 진행중이다. 그러나 이와 같은 통합액세스노드 시스템에 대한 경제성 분석이나 경제성에 영향을 미치는 불확실성 요인에 대한 분석이 이루어지지 않았다. 본 연구에서는 이러한 통합액세스노드 시스템을 실제 가입자망에 도입할 때 순현재가치(net present value), 순기비용(life cycle cost)을 가치척도로 하여 경제성을 분석하고 또한, 가치척도에 영향을 크게 미치는 불확실성 변수에 대하여 분석한다. 이를 통하여 중점적으로 관리하여야 하는 불확실성 변수를 제시하며 이들의 관리를 통하여 개발하는 시스템의 순현재가치가 어느 정도까지 증가하는지를 보여준다.

앙상블 기계 학습을 이용한 기온 예측

황유선,김찬수 건국대학교 기후연구소 2019 기후연구 Vol.14 No.2

In this study, we compared the prediction performances according to the bias and dispersion of temperature using ensemble machine learning. Ensemble machine learning is meta-algorithm that combines several base learners into one prediction model in order to improve prediction. Multiple linear regression, ridge regression, LASSO (Least Absolute Shrinkage and Selection Operator; Tibshirani, 1996) and nonnegative ride and LASSO were used as base learners. Super learner (van der Lann et al., 1997) was used to produce one optimal predictive model. The simulation and real data for temperature were used to compare the prediction skill of machine learning. The results showed that the prediction performances were different according to the characteristics of bias and dispersion and the prediction error was more improved in temperature with bias compared to dispersion. Also, ensemble machine learning method showed similar prediction performances in comparison to the base learners and showed better prediction skills than the ensemble mean.

5G 저지연 서비스 및 테스트베드 개발 동향

황유선,배명산,신재욱 한국통신학회 2015 정보와 통신 Vol.32 No.9

5세대(5G) 이동통신은 다양한 모바일 기기와 가입자의 확산에 따른 모바일 트래픽 증가를 수용할 뿐만 아니라 원격의료와 같이 저지연을 기반으로 하는 새로운 형태의 서비스를 제공함을 목표로 한다. 저지연 서비스는 수 밀리세컨드 (ms) 이내의 단대단 지연 요구사항을 가지며 무선 구간에서의 전송지연도 기존 시스템 대비 획기적인 단축을 필요로 한다. 본고에서는 5G 저지연 서비스의 개념 및 요구사항, 그리고 저지연 무선 기 술 및 테스트베드 개발 동향에 대해서 알아본다.

Myelodysplastic Syndrome Mimicking Idiopathic Thrombocytopenic Purpura

황유선,허정원,문영철,성주명,정화순 대한진단검사의학회 2010 Annals of Laboratory Medicine Vol.30 No.2

Background : In patients with isolated thrombocytopenia, but without significant dysplasia, diagnosis of idiopathic thrombocytopenic purpura (ITP) rather than myelodysplastic syndrome (MDS) may be taken into account. It is important to make an accurate diagnosis because different treatments are used for ITP and MDS. The purpose of this study was to investigate the clinical and hematologic features of patients who were initially diagnosed as ITP but had cytogenetic abnormalities. Methods : We retrospectively reviewed cytogenetic studies of 100 patients who were diagnosed as ITP from 2004 to 2009 at Mokdong Hospital of Ewha Womans University based on clinical features and hematologic studies. Bone marrow pathology was re-evaluated based on 2008 WHO classification. Cytogenetic analysis was performed by 24-48 hr culture of bone marrow aspirates without using mitogens and 20 metaphases were analyzed. Results : Of the 100 patients diagnosed as ITP initially, three patients (3%) had cytogenetic abnormalities. They had no thrombocytopenia-related symptoms and thrombocytopenia was found accidentally. The numbers of megakaryocytes in bone marrow were increased and dysplasia was not found in megakaryocyte, erythroid, and myeloid cell lineages. The proportion of blasts was within normal limits. Clonal chromosomal abnormalities found were der(1;7)(q10;p10), add(9)(q12), or t(7;11)(p22;q12). Presumptive diagnosis of MDS or diagnosis of idiopathic cytopenia of undetermined significance (ICUS) was made according to 2008 WHO classification. During the follow up, disease progression was not found. Conclusions : In patients with suspected ITP, cytogenetic analysis should be done. If specific clonal chromosomal abnormality is found, presumptive diagnosis of MDS has to be considered and close follow up is needed. (Korean J Lab Med 2010;30:105-10)

Evaluation of the Efficacies of Rapid Antigen Test, Multiplex PCR, and Real-time PCR for the Detection of a Novel Influenza A (H1N1) Virus

황유선,김경희,이미애 대한진단검사의학회 2010 Annals of Laboratory Medicine Vol.30 No.2

Background : In April 2009, a novel influenza A (H1N1) virus was detected in the US, and at the time of conducting this study, H1N1 infection had reached pandemic proportions. In Korea, rapid antigen tests and PCR assays have been developed to detect the H1N1 virus. We evaluated the efficacies of rapid antigen test, multiplex PCR, and real-time PCR for detecting the H1N1 virus. Methods : From August to September 2009, we tested 734 samples obtained from nasopharyngeal swab or nasal swab using rapid antigen test (SD Influenza Antigen, Standard Diagnostics, Inc., Korea) and multiplex PCR (Seeplex FluA ACE Subtyping, Seegene, Korea). We also tested 224 samples using the AdvanSure real-time PCR (LG Life Sciences, Korea) to compare the results obtained using real-time PCR with those obtained using multiplex PCR. Furthermore, 99 samples were tested using the AdvanSure real-time PCR and the AccuPower real-time PCR (Bioneer, Korea). Results : In comparison with the results of multiplex PCR, the sensitivity and specificity of the rapid antigen test were 48.0% and 99.8%, respectively. The concordance rate for multiplex PCR and the AdvanSure real-time PCR was 99.6% (k=0.991, P=0.000), and that for the AdvanSure real-time PCR and the AccuPower real-time PCR was 97.0% (k=0.936, P=0.000). Conclusions : The rapid antigen test is significantly less sensitive than PCR assay; therefore, it is not useful for H1N1 detection; however multiplex PCR, the AdvanSure real-time PCR, and the Accu- Power real-time PCR can be useful for H1N1 detection. (Korean J Lab Med 2010;30:147-52)

우리 것을 지키며 : 개척행전 성령행전 ; 미국교회들과 협력하여

황유선 기독교대한성결교회 활천사 2014 활천 Vol.722 No.1

우리 것을 지키며 : 선교행전 성령행전 ; 목사님이 개척하세요

황유선 기독교대한성결교회 활천사 2013 활천 Vol.721 No.-

유명인과의 트위터 매개 커뮤니케이션: 파워 트위터러의 네트워크 기능 탐색

황유선 한국소통학회 2012 한국소통학회 학술대회 Vol.2012 No.1

Anesthetic and Cardiopulmonary Effects of Medetomidine, Midazolam and Ketamine Combination in Beagle Dogs

황유선,박지영,정성목 한국임상수의학회 2013 한국임상수의학회지 Vol.30 No.6

This study was performed to examine the anesthetic and cardiopulmonary effects of medetomidine, midazolam and ketamine (MMK) combination in ten beagle dogs. Dogs were randomly allocated to two groups. Treatment group MMK-L received 0.015 mg/kg medetomidine followed by 0.3 mg/kg midazolam and 5 mg/kg ketamine by intramuscular injection. Treatment group MMK-H received 0.02 mg/kg medetomidine followed by 0.3 mg/kg midazolam and 5 mg/kg ketamine by intramuscular injection. Induction, anesthesia, sternal recumbency, standing, walking time, heart rate, arterial blood pressure, rectal temperature, respiratory rate and arterial blood gases were measured. Mean anesthesia time was significantly different between MMK-L group (52.4 ± 11.08 minutes) and MMK-H group (78.2 ± 20.72 minutes). Sedative scores and noxious stimuli were raised to the maximum value at 5 minutes after administration of the test dose and maintained until 40 minutes in both groups. In both groups, the heart rate significantly decreased after MMK administration. The blood pressures (MAP, SAP and DAP) increased after MMK administration but there were no significant differences in blood pressures between two groups. In conclusion, intramuscular administration of medetomidine followed by intramuscular injection of midazolam and ketamine in beagle dogs, leads immediate and sufficient anesthesia and proper doses of medetomidine for minimal adverse effects in intramuscular MMK combination will be 0.015 mg/kg in dogs.

뉴미디어 환경에서의 의견 지도력

황유선 한국방송학회 2010 한국방송학회 학술대회 논문집 Vol.2010 No.5