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Power Control of a Combined System with Fuel cell and Supercapacitor
Woong-Hyub Song,Jin-Young Kim,Haeyoung Park,Eui-Cheol Nho,In-Dong Kim,Heung-Geun Kim,Tae-Won Chun,Nam-Sup Choi 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper deals with a combined system with fuel cell and supercapacitor to provide a power to grid or electrical load. The supercapacitor is used to compensate the slow response of the fuel cell at the instant of abrupt load change. The operation of the bidirectional DC/DC converter for a supercapacitor during charging and discharging is analyzed, and a power control method to maintain a DC link voltage constant is proposed. Simulation results for 3㎾ combined system show the usefulness of the proposed method.
Yong-Hyub Kim,Sang-Yun Song,Hyun-Jeong Shim,Woong-Ki Chung,Sung-Ja Ahn,Mee Sun Yoon,Jae-Uk Jeon,Ju-Young Song,Taek-Keun Nam 대한방사선종양학회 2015 Radiation Oncology Journal Vol.33 No.1
Purpose: To evaluate treatment outcomes and determine prognostic factors in patients with esophageal cancer treated with esophagectomy after neoadjuvant chemoradiotherapy (NCRT) Materials and Methods: We retrospectively evaluated 39 patients with esophageal cancer who underwent concurrent chemoradiotherapy followed by esophagectomy between 2002 and 2012. Initial clinical stages of patients were stage IB in 1 patient (2.6%), stage II in 5 patients (12.9%), and stage III in 33 patients (84.6%). Results: The median age of all the patients was 62 years, and the median follow-up period was 17 months. The 3-year overall survival (OS) rate was 33.6% in all the patients. The 3-year locoregional recurrence-free survival (LRFS) rate was 33.7%. In multivariate analysis with covariates of age, the Eastern Cooperative Oncology Group performance status, hypertension, diabetes mellitus, tumor length, clinical response, clinical stage, pathological response, pathological stage, lymphovascular invasion, surgical type, and radiotherapy to surgery interval, only pathological stage was an independent significant prognostic factor affecting both OS and LRFS. The complications in postoperative day 90 were pneumonia in 9 patients, anastomotic site leakage in 3 patients, and anastomotic site stricture in 2 patients. Postoperative 30-day mortality rate was 10.3% (4/39); the cause of death among these 4 patients was respiratory failure in 3 patients and myocardial infarction in one patient. Conclusion: Only pathological stage was an independent prognostic factor for both OS and LRFS in patients with esophageal cancer treated with esophagectomy after NCRT. We could confirm the significant role of NCRT in downstaging the initial tumor bulk and thus resulting in better survival of patients who gained earlier pathological stage after NCRT.
Kim, Yong-Hyub,Song, Sang-Yun,Shim, Hyun-Jeong,Chung, Woong-Ki,Ahn, Sung-Ja,Yoon, Mee Sun,Jeong, Jae-Uk,Song, Ju-Young,Nam, Taek-Keun The Korean Society for Radiation Oncology 2015 Radiation Oncology Journal Vol.33 No.1
Purpose: To evaluate treatment outcomes and determine prognostic factors in patients with esophageal cancer treated with esophagectomy after neoadjuvant chemoradiotherapy (NCRT) Materials and Methods: We retrospectively evaluated 39 patients with esophageal cancer who underwent concurrent chemoradiotherapy followed by esophagectomy between 2002 and 2012. Initial clinical stages of patients were stage IB in 1 patient (2.6%), stage II in 5 patients (12.9%), and stage III in 33 patients (84.6%). Results: The median age of all the patients was 62 years, and the median follow-up period was 17 months. The 3-year overall survival (OS) rate was 33.6% in all the patients. The 3-year locoregional recurrence-free survival (LRFS) rate was 33.7%. In multivariate analysis with covariates of age, the Eastern Cooperative Oncology Group performance status, hypertension, diabetes mellitus, tumor length, clinical response, clinical stage, pathological response, pathological stage, lymphovascular invasion, surgical type, and radiotherapy to surgery interval, only pathological stage was an independent significant prognostic factor affecting both OS and LRFS. The complications in postoperative day 90 were pneumonia in 9 patients, anastomotic site leakage in 3 patients, and anastomotic site stricture in 2 patients. Postoperative 30-day mortality rate was 10.3% (4/39); the cause of death among these 4 patients was respiratory failure in 3 patients and myocardial infarction in one patient. Conclusion: Only pathological stage was an independent prognostic factor for both OS and LRFS in patients with esophageal cancer treated with esophagectomy after NCRT. We could confirm the significant role of NCRT in downstaging the initial tumor bulk and thus resulting in better survival of patients who gained earlier pathological stage after NCRT.
Ick Joon Cho,Woong-Ki Chung,Joon Kyoo Lee,Min-Cheol Lee,Jayeong Paek,Yong-Hyub Kim,Jae-Uk Jeong,Mee Sun Yoon,Ju-Young Song,Taek-Keun Nam,Sung-Ja Ahn,Dong Hoon Lee,Tae Mi Yoon,Sang-Chul Lim 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: To investigate the differences in treatment outcomes between two radiation techniques, intensity-modulated radiotherapy (IMRT) and three-dimensional conformal radiotherapy (3DCRT). Materials and Methods: We retrospectively analyzed 160 (IMRT = 23, 3DCRT = 137) patients with stage I glottic cancer treated from January 2005 through December 2016. The IMRT was performed with TomoTherapy (16 patients), volumetric-modulated arc therapy (6 patients), and step-and-shoot technique (1 patient), respectively. The 3DCRT was performed with bilateral parallel opposing fields. The median follow-up duration was 30 months (range, 31 to 42 months) in the IMRT group and 65 months (range, 20 to 143 months) in the 3DCRT group. Results: The 5-year overall survival and 3-year local control rates of the 160 patients were 95.7% and 91.4%, respectively. There was no significant difference in 3-year local control rates between the IMRT and 3DCRT groups (94.4% vs. 91.0%; p = 0.587). Thirteen of 137 patients in the 3DCRT group had recurrences. In the IMRT group, one patient had a recurrence at the true vocal cord. Patients treated with IMRT had less grade 2 skin reaction than the 3DCRT group, but this had no statistical significance (4.3% vs. 21.2%; p = 0.080). Conclusion: IMRT had comparable outcomes with 3DCRT, and a trend of less acute skin reaction in stage I glottic cancer patients
한국인에서 간세포암종 발생의 위험요인 및 개인별 간세포암종 발생 예측모형
박영수,송기준,최창환,안상훈,김동기,전재윤,한광협,문영명,백용한,이현웅,정재연 대한간학회 2001 Clinical and Molecular Hepatology(대한간학회지) Vol.7 No.4
Background / Aim : We identified risk factors for hepatocellular carcinoma(HCC)through a nine-year follow-up study, ending last year, of 4,339 patients with chronic liver disease. The aim of this study was to establish an individual prediction model according to risk factors for the development of HCC. Methods : We studied a total of 1994 patients who had regular check-ups from January 1990 to December 1998. We analyzed the risk factors and established the individual prediction model to predict the risk rate for HCC using logistic regression analysis. We applied the model to patients who were enrolled over the next two years. Results : 90(9.05%) out of 994 patients developed HCC during a mean of 33 months of follow-up. The risk index for individual patients was made by considering the relative risk level of statistically significant risk factors. From 1999 to 2000, 480 patients were newly enrolled and divided into a low risk group(less than 5% probability), an intermediate risk group(5% to 10% probability), and a high risk group(more than 10% probability). According to this classification, 1 of 191 patients in the low risk group(0.523%), 5 of 176 patients intermediate risk group(2.84%), and 21 of 113 patients in the high risk group(18.6%) were diagnosed with HCC. Conclusion : We confirmed the reliability of the newly established individual prediction model for the screening of HCC. This model may help screening programs to be done effectively by focusing on high risk groups for HCC.
Cho, Ick Joon,Chung, Woong-Ki,Lee, Joon Kyoo,Lee, Min-Cheol,Paek, Jayeong,Kim, Yong-Hyub,Jeong, Jae-Uk,Yoon, Mee Sun,Song, Ju-Young,Nam, Taek-Keun,Ahn, Sung-Ja,Lee, Dong Hoon,Yoon, Tae Mi,Lim, Sang-Ch The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.4
Purpose: To investigate the differences in treatment outcomes between two radiation techniques, intensity-modulated radiotherapy (IMRT) and three-dimensional conformal radiotherapy (3DCRT). Materials and Methods: We retrospectively analyzed 160 (IMRT = 23, 3DCRT = 137) patients with stage I glottic cancer treated from January 2005 through December 2016. The IMRT was performed with TomoTherapy (16 patients), volumetric-modulated arc therapy (6 patients), and step-and-shoot technique (1 patient), respectively. The 3DCRT was performed with bilateral parallel opposing fields. The median follow-up duration was 30 months (range, 31 to 42 months) in the IMRT group and 65 months (range, 20 to 143 months) in the 3DCRT group. Results: The 5-year overall survival and 3-year local control rates of the 160 patients were 95.7% and 91.4%, respectively. There was no significant difference in 3-year local control rates between the IMRT and 3DCRT groups (94.4% vs. 91.0%; p = 0.587). Thirteen of 137 patients in the 3DCRT group had recurrences. In the IMRT group, one patient had a recurrence at the true vocal cord. Patients treated with IMRT had less grade 2 skin reaction than the 3DCRT group, but this had no statistical significance (4.3% vs. 21.2%; p = 0.080). Conclusion: IMRT had comparable outcomes with 3DCRT, and a trend of less acute skin reaction in stage I glottic cancer patients.
Jeong, Jae-Uk,Nam, Taek-Keun,Song, Ju-Young,Yoon, Mee Sun,Ahn, Sung-Ja,Chung, Woong-Ki,Cho, Ick Joon,Kim, Yong-Hyub,Cho, Shin Haeng,Jung, Seung Il,Kwon, Dong Deuk The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.3
Purpose: To determine prognostic significance of lymphovascular invasion (LVI) in prostate cancer patients who underwent adjuvant or salvage postoperative radiotherapy (PORT) after radical prostatectomy (RP) Materials and Methods: A total of 168 patients with prostate cancer received PORT after RP, with a follow-up of ≥12 months. Biochemical failure after PORT was defined as prostate-specific antigen (PSA) ≥0.2 ng/mL after PORT or initiation of androgen deprivation therapy (ADT) for increasing PSA levels regardless of the value. We analyzed the clinical outcomes including survivals, failure patterns, and prognostic factors affecting the outcomes. Results: In total, 120 patients (71.4%) received salvage PORT after PSA levels were >0.2 ng/mL or owing to clinical failure. The 5-year biochemical failure-free survival (BCFFS), clinical failure-free survival (CFFS), distant metastasis-free survival (DMFS), overall survival, and cause-specific survival rates were 78.3%, 94.3%, 95.0%, 95.8%, and 97.3%, respectively, during a follow-up range of 12-157 months (median: 64 months) after PORT. On multivariate analysis, PSA level of ≤1.0 ng/mL at the time of receiving PORT predicted favorable BCFFS, CFFS, and DMFS. LVI predicted worse CFFS (p = 0.004) and DMFS (p = 0.015). Concurrent and/or adjuvant ADT resulted in favorable prognosis for BCFFS (p < 0.001) and CFFS (p = 0.017). Conclusion: For patients with adverse pathologic findings, PORT should be initiated as early as possible after continence recovery after RP. Even after administering PORT, LVI was an unfavorable predictive factor, and further intensive adjuvant therapy should be considered for these patients.