• Title/Summary/Keyword: PSTP

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Association between periodontal flap surgery for periodontitis and vasculogenic erectile dysfunction in Koreans

  • Lee, Jae-Hong;Choi, Jung-Kyu;Kim, Sang-Hyun;Cho, Kyung-Hyun;Kim, Young-Taek;Choi, Seong-Ho;Jung, Ui-Won
    • Journal of Periodontal and Implant Science
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    • v.47 no.2
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    • pp.96-105
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    • 2017
  • Purpose: The National Health Insurance Service-National Sample Cohort and medical checkup data from 2002 to 2013 were used to evaluate the association between periodontal surgery for the treatment of periodontitis (PSTP) and vasculogenic erectile dysfunction (VED). Methods: Bivariate and multivariate logistic regression analyses were applied to a longitudinal retrospective database to assess the association between PSTP and VED while adjusting for the potential confounding effects of sociodemographic factors (age, household income, insurance status, health status, residence area, and smoking status) and comorbidities (diabetes mellitus, angina pectoris, cerebral infarction, and myocardial infarction). Results: Among the 7,148 PSTP within the 268,296 recruited subjects, the overall prevalence of VED in PSTP was 1.43% (n=102). The bivariate analysis showed that VED was significantly related to PSTP (odds ratio [OR], 1.99; 95% confidence interval [CI], 1.38-2.06; P<0.001), and this was confirmed in the multivariate analysis after adjusting for sociodemographic factors and comorbidities (OR, 1.29; 95% CI, 1.06-1.58; P=0.002). Conclusions: Subjects with a history of periodontal flap surgery had a significantly higher risk of VED, after adjusting for potential confounding factors. Further studies are required to identify the key mechanisms underlying the association between severe periodontal disease and VED.

Multi-Level Models for Activity Participation and Travel Behaviors (다수준 모형을 이용한 활동참여와 통행행태 분석)

  • 최연숙;정진혁;김성호
    • Journal of Korean Society of Transportation
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    • v.20 no.7
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    • pp.79-85
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    • 2002
  • In this paper, multilevel models are adopted to identify interactions among household members in trip making behaviors. The multilevel approach is a proper methodology to handle samples, which are extracted from a hierarchical structure universe. PSTP dataset is used in developing models and understand proportion of variations among individuals and household. The results of this study show that for activity participation and travel behavior household level variance is more than 1/4 of person level variance and therefore not negligible. The results confirm the importance of multilevel model in travel behavior analysis.

Dynamic Structural Equation Models of Activity Participation and Travel Behavior using Puget Sound Transportation Panel (Puget Sound Transportation Panel을 이용한 활동참여와 통행행동의 Dynamic SEM)

  • 최연숙;정진혁
    • Journal of Korean Society of Transportation
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    • v.20 no.6
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    • pp.129-140
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    • 2002
  • This paper develops a dynamic structural equation model, which captures relationships among socio-demographics, activity participation(i.e., time use) and travel behavior in consideration with time variation effects. The data used in developing the model are two waves(the year 1991 and 1992) from Puget Sound Transportation Panel (PSTP). which is surveyed in Puget Sound Region in United States. The PSTP is widely used in transportation behavior analysis and includes various information of traveler's socio-economic, travel patterns, and activity participation. In the model, we use 10 endogenous variables including activity participations and travel behaviors and 10 exogenous variables composed of time variant and invariant traveler's socio-demographic variables. The empirical model shows that strong relationships exist not only between socio-demographics and travel behavior, but between waves. We also confirm needs of panel data set to identify and understand time variation effects and travel behaviors.

Effect of ammonia nitrogen and microorganisms on the elevated nitrogenous biochemical oxygen demand (NBOD) levels in the Yeongsan river in Gwangju (광주지역 영산강의 NBOD 발생에 대한 암모니아성 질소 및 미생물 영향 연구)

  • Jang, Dong;Cho, Gwangwoon;Son, Gyeongrok;Kim, Haram;Kang, Yumi;Lee, Seunggi;Hwang, Soonhong;Bae, Seokjin;Kim, Yunhee
    • Journal of Korean Society of Water and Wastewater
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    • v.36 no.2
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    • pp.81-95
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    • 2022
  • The present study was performed to investigate the effects of NH3-N and nitrifying microorganisms on the increased BOD of downstream of the Yeongsan river in Gwangju. Water samples were collected periodically from the 13 sampling sites of rivers from April to October 2021 to monitor water qualities. In addition, the trends of nitrogenous biochemical oxygen demand (NBOD) and microbial clusters were analyzed by adding different NH3-N concentrations to the water samples. The monitoring results showed that NH3-N concentration in the Yeongsan river was 22 times increased after the inflow of discharged water from the Gwangju 1st public sewage treatment plant (G-1-PSTP). Increased NH3-N elevated NBOD levels through the nitrification process in the river, consequently, it would attribute to the increase of BOD in the Yeongsan river. Meanwhile, there was no proportional relation between NBOD and NH3-N concentrations. However, there was a significant difference in NBOD occurrence by sampling sites. Specifically, when 5 mg/L NH3-N was added, NBOD of the river sample showed 2-4 times higher values after the inflow of discharged water from G-1-PSTP. Therefore, it could be thought other factors such as microorganisms influence the elevated NBOD levels. Through next-generation sequencing analysis, nitrifying microorganisms such as Nitrosomonas, Nitroga, and Nitrospira (Genus) were detected in rivers samples, especially, the proportion of them was the highest in river samples after the inflow of discharged water from G-1-PSTP. These results indicated the effects of nitrifying microorganisms and NH3-N concentrations as important limiting factors on the increased NBOD levels in the rivers. Taken together, comprehensive strategies are needed not only to reduce the NH3-N concentration of discharged water but also to control discharged nitrifying microorganisms to effectively reduce the NBOD levels in the downstream of the Yeongsan river where discharged water from G-1-PSTP flows.

Multilevel and Multivariate Structural Equation Models for Activity Participation and Travel Behavior (다수준 다변량 구조방정식을 이용한 활동참여와 통행행태 분석에 관한 연구)

  • 최연숙;정진혁
    • Journal of Korean Society of Transportation
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    • v.21 no.4
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    • pp.145-154
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    • 2003
  • Multilevel and Multivariate Structural Equation Mpdel is applied to handle the hierarchical nature of the data and explain complex relationship among socioeconomic factors of individuals and household, activity participation, and travel behavior using Puset Sound Transportation Panel data. From analysis, variations of individual activity participation and travel behavior can be divided into two categories : Within-household variation and Between-households variation. Empirical results show that the interdependency index(p) of variables for household members within a household is between 0.13 and 0.33 indicating high interdependency. These results suggest that Multilevel and Multivariate SEM approach is an appropriate modeling methodology and gives additional information for activity participation and travel behavior. Also most of personal and household characteristics influence on activity participation and travel behavior within a household as well as between households.