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PAC 응집제 종류에 따른 조류가 포함된 상수원수의 부상분리효율 비교
박종원,민성기,이혜연,윤철종,이창한,Jong-Won Park,Seong-Kee Min,Hye-Yeon Lee,Churl-Jong Yun,Chang-Han Lee 한국환경과학회 2023 한국환경과학회지 Vol.32 No.5
This study used a batch DAF (dissolved air flotation) jar tester to evaluate the algae removal efficiency of alum and PAC coagulants during coagulation, flocculation, and flotation. Optimal coagulant dosages were 0.06 ~ 0.15 mL/L (12.0 ~ 26.0 mg Al/L,17%), 0.08 ~ 0.20 mL/L (10.0 ~ 24.0 mg Al/L, 12%), 0.25 ~ 0.30 mL/L (25.0 ~ 30.0 mg Al/L, 10%) for PAC, and 3.0 ~ 5.0 mL/L (81.0 ~ 135.0 mg Al/L, 2.7%) for alum. Turbidity of treated water was 1.0 ~ 2.0 NTU in optimal coagulation, flocculation, and flotation conditions for the four coagulants types. The amount of coagulant injected tended to decrease with increasing Al content in the coagulant, as follows : 17% PAC < 12% PAC < 10% PAC < 2.7% alum. Turbidity removal efficiencies were in the order of 12% PAC (93.6%) > 10% PAC (92.7%) > 17% PAC (91.3%) > 2.7% Alum (88.1%).
사각판 스티프너로 보강한 콘크리트 충전강관 기둥과 H형강 보 접합부의 내진성능
박종원,강승민,김욱종,Park, Jong Won,Kang, Seoung Min,Kim, Wook Jong 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.2
본 연구는 보 플랜지와 스티프너의 용접부 양단, 기둥 모서리 부분 스티프너에 라운드를 두는 방법 등을 통하여 총 7개 시험체에 실물대 반복하중실험을 실시한 결과를 나타낸 것이다. 실험 결과를 통하여 다음과 같은 결론을 얻을 수 있었다. (1) 필레(fillet)를 둠으로써 응력집중을 줄여 내진성능을 크게 향상 시킬 수 있다. (2) 스티프너 폭의 증가로 접합부의 강성 및 강도는 증가하였지만 에너지 소산 능력은 감소하였다. (3) 모든 시험체는 규준에서 강진지역의 내진구조에 대해 요구하는 총 0.04 radian의 회전각을 발휘할 수 있는 것으로 나타났다. This paper presented the results of cyclic loading tests of 7 full-scale beams to column subassemblages with improved connection detail i.e., fillets of the stiffening plates at the column corners and ends of the stiffener-to-beam flange weld. Major findings from the test results were: (1) Fillets reduced the stress concentrations that may cause early brittle fractures and considerably improved the cyclic performance compared to the detail without fillets. (2) As the width of the stiffening plate increased, the stiffness and peak strength increased and energy dissipation capacity decreased. (3) While all specimens failed by a fracture, they could develop a total rotation of 0.04 radian required for special moment resisting frames.
시청자 공적 가치 인식이 공영방송의 필요성과 TV 수신료 지불의사에 미치는 영향
박종원(Jong-won Park),김광호(Kwang-Ho Kim) 한국디지털콘텐츠학회 2016 한국디지털콘텐츠학회논문지 Vol.17 No.3
This paper is designed to study how public values of viewers impact on the necessity of public service broadcasters and the willingness to payment of TV license fee based on the public-opinion survey regarding raising KBS TV license fee which was submitted to the National Assembly in 2013. To investigate this influence, seven main projects presented by KBS are classified into five public values of public (service) broadcasters such as quality, diversity, universality, social value and global value. The seven key performance tasks were presented by KBS. The study results are summarized as follows. Firstly, the survey group who selected the digital welfare enlargement by free terrestrial multi-channel broadcasting among public values recognized as highest the necessity of public service broadcasting as the most highly. Secondly, regarding the question of raising license fee, 72.4 percent of respondents were in favor of 1,000 won and 43.9 percent of respondents were in favor of 1,500 won. The result of this study shows that public service broadcasting has the possibility of securing the legitimacy of license fee policy when public service broadcasters faithfully carry out the five public values as above.
요양병원 직원의 감정노동, 회복탄력성 등이 업무성과에 미치는 영향
박종원,Park, Jong-won 한국벤처혁신학회 2021 벤처혁신연구 Vol.4 No.1
This was empirical research aimed at determining the effects of emotional labor, Resilience and service environment, on the performance of Long-term Care Hospital Employee. The participants were 180 employees working in long-term care hospitals in Gyeonggi-do. The collected data were analyzed using the SPSS statics19.0 program. The study were analyzed by frequency analysis and descriptive statistics, ANOVA, Scheffe? test, Pearson correlation coefficients, and stepwise regression. As a result of the study, age, marriage status, career, and position affected performance among the general characteristics.tion coefficients, and stepwise regression. As a result of the study, the average performance was 91.25 (±12.46) points, emotional labor was 41.25 (±4.21) points, Resilience was 52.89 (±6.37), and the service environment was 78.93(±15.3) points. The performance showed a positive correlation with emotional labor(r=.326, p<.001) service environment (r=.384, p=.005) and Resilience (r=.417, p<.001) of Long-term Care Hospital Employee. Service environment was the biggest factor affecting performance, and the second was resilience. The explanatory power of this regression model was 48.2% and was statistically significant (F=58.249, p<.001).
박종원,최성용,우광준,Park, Jong Won,Choi, Sung Yong,Woo, Kwang Jun The Institute of Electronics and Information Engin 1987 전자공학회논문지 Vol.24 No.2
This paper, realizes the design of the sequential controller of a reinforced warehousing-delivery and unmanned transportation system for automated warehouse system. The system is composed of ware housing delivery adn transportation system using two unmanned vehicles with hierachical structure. It is described by GRAFCET and realized by programmed logic with microprocessor. Being described by GRAFCET, the system is able to divide it into subsystems and to synchronize them. Defining the concept of program module, one can easily program the system with the microprocessor instruction language.
특집 - 기계류부품 신뢰성평가 기술 - 과다 예압을 받는 테이퍼롤러 베어링의 수명단축효과에 대한 실험적 연구 -
박종원,김도식,Park, Jong-Won,Kim, Do-Sik 재료연구소 2009 機械와 材料 Vol.21 No.3
테이퍼롤러 베어링의 축방향 과다 예압에 의한 수명 단축 효과를 실험적으로 검증하고 그 결과에 의한 베어링의 수명 분포를 분석하여, 기존의 $L_{10}$ 수명식에 비하여 현장 작동 조건에 따른 실질적인 수명을 산출할 수 있는 축방향과 반경방향을 고려한 수명식을 도출하고 이를 프로그램화 하여 설계 및 생산 현장에서 용이하게 활용할 수 있도록 하였다.
일부 사무직 근로자와 생산직 근로자간의 일반건강진단 검사 결과의 차이
박종원,신동훈,이미영,서석권,Park, Jong-Won,Shin, Dong-Hoon,Lee, Mi-Young,Suh, Suk-Kwon 대한예방의학회 1995 예방의학회지 Vol.28 No.3
이 연구는 대구시 소재 일개 검진기관에서 1992년도에 일반건강진단을 받은 근로자를 대상으로 하여 사무직 근로자와 생산직 근로자간의 차이가 선별검사 결과에서 있는지를 알기 위해 시행되었다. 대상자는 남자 6,597명과 여자 3,610명으로 총 10.2명이 선택되었다. 남녀별로 나누어 각 선별검사 항목별로 단일분석을 시행한 후 유의한 변수를 골라 지수 회귀분석을 이용하여 사무직종에 대한 생산직을 비교하였다. 청력검사 항목은 남녀 모두에서 사무직보다 생산직에서 이상률이 더 컸다. 혈구용적치와 고혈압 항목은 조정변수를 교정한 후에도 남녀모두 직종간의 차이가 없었다. 간기능과 요단백 항목은 남자에서 사무직의 이상률이 생산직보다 더 높은 것으로 나타났다. 시력항목은 여자에서만 직종간의 차이를 보였으며 사무직에서 시력교정의 필요성이 더 켰다. 이상의 결과는 사무직종과 생산직종간에 일반건강진단의 검사 결과에서 차이가 있으며 원인규명을 위한 연구가 필요함을 보여준다. The authors conducted a cross-setional study to evaluate the differences of screening test results between clerks and laborers in an occupational health center in Taegu, 1992. A total of 10, 207 workers was included in the study. Of these, male were 6,597 and female 3,610. Constitutional variables included were items of health examination and some confounding variables(sex, age, body weight and work duration). All analyses were conducted separately for each sex through the use of multiple logistic regression analysis on occupation, controlling for age, work duration, and body weight. Laborers showed abnormal hearing test more often than clerks in both sexes. The blood pressure that showed statistical significance in univariate analysis in both sexes lost its significance after controlling covariates. Liver function and urine protein had statistically significant differences between two occupational groups in males and visual correction did in females. The results suggest that there are differences clerks and laborers in some of screening tests and analytic studies are needed to identify the causes of the differences.