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위원석,하승균,배성우,최홍윤,팽진철,천기정,강건욱,이동수 대한핵의학회 2020 핵의학 분자영상 Vol.54 No.4
Purpose EGFR-mutation (EGFR-mt) is a major oncogenic driver mutation in lung adenocarcinoma (ADC) and is more often observed in Asian population. In lung ADC, some radiomics parameters of FDG PET have been reported to be associated with EGFR-mt. Here, the associations between EGFR-mt and PET parameters, particularly asphericity (ASP), were evaluated in Asian population. Methods Lung ADC patients who underwent curative surgical resection as the first treatment were retrospectively enrolled. EGFR mutation was defined as exon 19 deletion and exon 21 point mutation and was evaluated using surgical specimens. On FDG PET, image parameters of maximal standardized uptake value (SUVmax), metabolic tumor volume (MTV), total lesion glycolysis (TLG), and ASP were obtained. The parameters were compared between EGFR-mt and wild type (EGFR-wt) groups, and the relationships between these PET parameters and EGFR-mt were evaluated. Results A total of 64 patients (median age 66 years, M:F = 34:30) were included in the analysis, and 29 (45%) patients showed EGFR-mt. In EGFR-mt group, all the image parameters of SUVmax, MTV, TLG, and ASP were significantly lower than in EGFR-wt group (all adjusted P < 0.050). In univariable logistic regression, SUVmax (P = 0.003) and ASP (P = 0.010) were significant determinants for EGFR-mt, whereasMTV was not (P = 0.690). Multivariate analysis revealed that SUVmax and ASP are independent determinants for EGFR-mt, regardless of inclusion of MTV in the analysis (P < 0.05). Conclusion In Asian NSCLC/ADC patients, SUVmax, MTV, and ASP on FDG PET are significantly related to EGFR mutation status. Particularly, low SUVmax and ASP are independent determinants for EGFR-mt.
金正勳,柳輔赫,魏湲錫 弘益大學校 科學技術硏究所 2000 科學技術硏究論文集 Vol.11 No.-
In this paper, portable and vehicle-mounted generators grounding methods of low-voltage systems is compared to each other. Ungrouded system is better for the safety operation than solidly grounding system. Solidly-grounding method causes so high fault current that its safety voltages is lower than the ungrounded method. This paper also determined the magnitude and duration of the pelniissible body current limit and step voltage for the solidly-grounding and ungrounded system.
배성우,최홍윤,위원석,팽진철,천기정,강건욱,이동수 대한핵의학회 2020 핵의학 분자영상 Vol.54 No.6
Purpose The precise quantification of dopamine transporter (DAT) density on N-(3-[18F]Fluoropropyl)-2β-carbomethoxy- 3β-(4-iodophenyl) nortropane positron emission tomography ([18F]FP-CIT PET) imaging is crucial to measure the degree of striatal DAT loss in patients with parkinsonism. The quantitative analysis requires a spatial normalization process based on a template brain. Since the spatial normalization method based on a delayed-phase PET has limited performance, we suggest an early-phase PET-based method and compared its accuracy, referring to the MRI-based approach as a gold standard. Methods A total of 39 referred patients from the movement disorder clinic who underwent dual-phase [18F]FP-CIT PET and took MRI within 1 year were retrospectively analyzed. The three spatial normalization methods were applied for quantification of [18F]FPCIT PET-MRI-based anatomical normalization, PET template-based method based on delayed PET, and that based on early PET. The striatal binding ratios (BRs) were compared, and voxelwise paired t tests were implemented between different methods. Results The early image-based normalization showed concordant patterns of putaminal [18F]FP-CIT binding with anMRI-based method. The BRs of the putamen from the MRI-based approach showed higher agreement with early image- than delayed imagebased method as presented by Bland-Altman plots and intraclass correlation coefficients (early image-based, 0.980; delayed image-based, 0.895). The voxelwise test exhibited a smaller volume of significantly different counts in putamen between brains processed by early image and MRI compared to that between delayed image and MRI. Conclusion The early-phase [18F]FP-CIT PET can be utilized for spatial normalization of delayed PET image when theMRI image is unavailable and presents better performance than the delayed template-based method in quantitation of putaminal binding ratio.
전력전자 반도체 기반의 FACTS를 설치한 HVDC의 비용 분담 방안
이두희(D. H. Lee),위원석(W. S. Wi),최원석(W. S. Choi) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.11
지속적인 경제 성장으로 전력 수요가 꾸준히 늘어나고 있다. 계통 운영 기관은 늘어나는 수요에 맞춰 발전소의 발전량을 늘리고 국가 기관에서는 추가 발전 시설을 확보하려고 한다. 이에 따라 안정적인 전력공급을 위해서 765kV와 같은 추가 송전 시설을 건설하려고 하지만, 주민 수용성 문제와 환경 문제가 겹쳐 건설 계획에 제약이 따르게 된다. 대안책으로 HVDC, FACTS 같은 유연성 송전 설비가 거론됐다. 유연성 송전 설비는 계통 안정성과 효율성 모두 높이지만, 설치 단계에서 많은 비용을 요구한다. 계통 내 이해관계자들은 접속설비 건설 비용을 분담해야 하지만, 관련 비용을 높아지고 계통이 복잡해짐에 따라 비용분담 과정에 어려움이 따르고 있다. 비용분담에 관련된 시행규칙이 있지만, 현대 계통에 적용하기엔 불합리한 측면이 있다. 본 논문에서는 효율적인 비용분담에 관한 2가지 방법을 제안한다. 첫 번째는 이해관계자들의 기여도를 측정한 다음 기여도 기반으로 비용을 분담하는 방법이다. 두 번째 방식은 접속설비 설치에 따른 편익을 계산하여 비용을 분담한다.