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이문용,전양,김영호,이정일,Lee, Moon-Yong,Jeon, Yang,Kim, Young-Ho,Lee, Jeong-Il 한국펄프종이공학회 1999 펄프.종이기술 Vol.31 No.4
This study was carried to investigate optimum conditions of charcoal added paper in making cigarette filter for the removal of smoke contents of cigarettes. We investigated the physical properties of charcoal added paper according to the ratio of pulps, the amounts of characoal , the weight of sheets and crimping conditions in dry method, and then analyzed the smoke contents of cigarettes. The results obtained were as follows. 1. Sw-BKP was higher than Hw-BKP in methylene blue absorption by UV test. 2. Charcoal had an effect on stiffness for decreasing factor greatly , while the addition amounts of Sw-BKP and high weigth of sheets increased it, and the interaction of weight of sheets and charcoal was higher than other factors. 3. Tear index decreased by charcoal addition greatly, on the other hand high weight of sheets and Sw-BKP/Hw-BKP ratio increased ter, and the interaction of pulps and chacoal acted on major factors. 4. We estimated crimp index with sensory evaluation , and charcoal hand an effect on decreasing factor in crimping greatly, while the interaction of weight of sheets and pulp ratio was higher than others. 5. In the case of charcoal added paper filter, tar removal efficiency of smoke contents was higher but about 6% than cigarette filter. Especially vapour phase(aldehyde) in smoke contents was removed greatly.
송신정,양필성,김태훈,엄재선,박희남,이문형,정보영 대한부정맥학회 2017 International Journal of Arrhythmia Vol.18 No.4
Background: Although a few previous studies have analyzed the role of reduced lung function in predicting atrial fibrillation (AF), the relationship between the incidence of AF and comorbid chronic obstructive pulmonary disease (COPD) is unclear. We hypothesized that COPD is associated with the occurrence of new-onset AF and clinical outcomes in AF patients. Methods: We analyzed the development of new-onset AF in 501,668 patients without AF and clinical outcomes in 4,541 patients with AF using Korean National Health Insurance Service-National Sample Cohort (NHIS-NSC). Results: Comorbid COPD was found in 4.8% (11,442 of 501,668) of non-AF patients and 18.6% (820 of 4,541) of AF patients. The incidence of AF in COPD patients was significantly higher compared to non-COPD patients (2.6% vs. 0.6%, p<0.001) over the follow-up period (45.5±14.9 months). In a multivariate Cox regression analysis, COPD predicted higher risk of AF independently from other risk factors (HR: 1.41, 95% CI: 1.25-1.60, p<0.001). The all-cause mortality of AF patients with COPD was significantly higher in patients who used b-blockers (20.6% vs 13.1% during follow-up, p<0.008). Multivariate Cox regression analysis showed that COPD is still an independent risk factor for all-cause mortality (HR: 1.25, 95% CI: 1.03-1.51, p=0.022), and stroke (HR: 1.19, 95% CI: 1.00- 1.41, p=0.039). Conclusion: The presence of COPD is an independent risk factor for new-onset AF. COPD is independently associated with all-cause mortality and stroke in AF patients.
Changes in Cardiovascular Health Status and Risk of Sudden Cardiac Death in Older Adults
김민,양필성,유희태,김태훈,장은선,엄재선,박희남,이문형,정보영 연세대학교의과대학 2021 Yonsei medical journal Vol.62 No.4
Purpose: Cardiovascular health (CVH) status is associated with several cardiovascular outcomes; however, correlations betweenchanges in CVH status and risk of sudden cardiac death (SCD) are unknown. We aimed to evaluate associations between changesin CVH status and risk of SCD and all-cause death in older adults. Materials and Methods: We used data from the Korea National Health Insurance Service-Senior cohort database (2005–2012). Sixmetrics from the American Heart Association (smoking, body mass index, physical activity, blood pressure, total cholesterol, andfasting blood glucose) were used to calculate CVH scores. Changes in CVH status between two health checkups were categorizedas low to low, low to high, high to low, and high to high. Results: We included 105200 patients whose CVH status for an initial and follow-up health checkup (2-year interval) was available. During a median of 5.2 years of follow-up after a second health checkup, 688 SCDs occurred. Compared to patients with apersistent low CVH status, those with a consistently high CVH status had a reduced risk of SCD [adjusted hazard ratio (HR), 0.69;95% confidence interval (CI), 0.56–0.86] and all-cause death (adjusted HR, 0.74; 95% CI, 0.69–0.78). The risk of all-cause death followedsimilar trends. However, an inconsistent linear relationship was observed for changes in CVH status and the risk of SCD,but not of all-cause death. Conclusion: Maintaining a high CVH status was associated with future risks of SCD and all-cause death among an older adultpopulation.
김희재,양이문 한국자료분석학회 2008 Journal of the Korean Data Analysis Society Vol.10 No.2
본 연구는 청년패널조사(2006)의 자료를 활용하여 직업별 취업자의 직장만족도에 관한 요인을 분석하였다. 직장만족도에 사용된 변수는 임금, 고용안정성, 하는 일, 근무환경, 근무시간, 발전가능성, 인간관계, 인사고가, 복지후생의 9개가 사용되었고, 직업분류는 2007년 7월에 발표된 통계청 직업분류군 9개를 관리 및 전문직, 사무종사직, 판매 및 서비스직, 장치 및 기계조작 및 조립직, 단순노무직으로 재분류하여 5개의 범주를 사용했다. 직장만족도를 구성하는 9개의 변수를 요인분석 한 결과 안정 및 보상요인, 자아실현 및 소통요인, 근로조건요인으로 추출되었는데 이를 직업별로 살펴보면, 관리 및 전문직, 단순노무직은 근로조건요인이, 나머지 직업군에서는 안정 및 보상요인이 직장만족도에 가장 영향을 주는 것으로 나타났다. 연구의 결과를 토대로 직업별로 개별화된 제도적 지원의 필요성이 제기되며, 차후의 시계열적 직장만족도 연구가 요구된다. This study was analyzed factors about the employed person's job satisfaction in accordance with job classification using data of the Youth Panel Survey. Nine Variable are used in job satisfaction as like payment, job stability, contents of work, work environment, development possibility, human relationships, personnel affairs, benefits. The job classification applied five job categories which were announced in the National Statistical Office; it is professional work, office work, salesmanship and service work, equipment and machine assembling work, simple labor work. In management and professional, simple labor work, work condition was revealed that it affect more positive in job satisfaction. On the other hand, office work, salesmanship and service work, equipment and machine assembling work's facts of job satisfaction is stability & compensation. On the result of the study, it is proposed the necessity of individual and institutional supports on the work place classification. At the same time, it needs time-series study from now on.
박희남,김인수,양필성,김태훈,박준범,박진규,엄재선,정보영,이문형 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.1
Purpose: The clinical significance of post-procedural atrial premature beats immediately after catheter ablation for atrial fibrillation(AF) has not been clearly determined. We hypothesized that the provocation of immediate recurrence of atrial premature beats (IRAPB) and additional ablation improves the clinical outcome of AF ablation. Materials and Methods: We enrolled 200 patients with AF (76.5% males; 57.4±11.1 years old; 64.3% paroxysmal AF) who underwentcatheter ablation. Post-procedure IRAPB was defined as frequent atrial premature beats (≥6/min) under isoproterenol infusion(5 μg/min), monitored for 10 min after internal cardioversion, and we ablated mappable IRAPBs. Post-procedural IRAPB provocations were conducted in 100 patients. We compared the patients who showed IRAPB with those who did not. We also compared the IRAPB provocation group with 100 age-, sex-, and AF-type–matched patients who completed ablation without provocation (No-Test group). Results: 1) Among the post-procedural IRAPB provocation group, 33% showed IRAPB and required additional ablation with a longer procedure time (p=0.001) than those without IRAPB, without increasing the complication rate. 2) During 18.0±6.6 months of follow-up, the patients who showed IRAPB had a worse clinical recurrence rate than those who did not (27.3% vs. 9.0%; p=0.016), in spite of additional IRAPB ablation. 3) However, the clinical recurrence rate was significantly lower in the IRAPB provocation group (15.0%) than in the No-Test group (28.0%; p=0.025) without lengthening of the procedure time or raising complication rate. Conclusion: The presence of post-procedural IRAPB was associated with a higher recurrence rate after AF ablation. However, IRAPB provocation and additional ablation might facilitate a better clinical outcome. A further prospective randomized study is warranted.