• Title/Summary/Keyword: PM10 management

Search Result 1,564, Processing Time 0.037 seconds

Studies on the Environmental Behaviors of Ambient $PM_{2.5}$ and $PM_{10}$ in Suwon Area (수원지역 대기 중 $PM_{2.5}$$PM_{10}$의 환경거동에 관한 연구)

  • 김동술
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.16 no.2
    • /
    • pp.89-102
    • /
    • 2000
  • A total of 318 particulate sample sets consisting of both fine PM(FPM : dp$\leq$2.5 ${\mu}{\textrm}{m}$) and coarse PM(CPM : 2.5${\mu}{\textrm}{m}$${\mu}{\textrm}{m}$) was collected by a dichotomous sampler in Suwon area from December 1996 to November 1997. The concentration of seven inorganic elements such as pb. Cr, Cd, Cu, Zn Fe and Na were determined from each sample using an AAS. The purpose of the study was to extensively investigate environmental behaviors of particulate matters and to provide air quality management schemes applying various statistical approaches. The mean concentrations of PM10 Results of correlation analyses indicated the existence of strong correlations among inorganic elements PM10 FPM CPM and various meterological variables. Our study also examined the degree of uncertainties whether the particular elements can be assorted into the accumulation mode or the coarse mode in their size distribution. Furthermore the analysis of the pollution rose showed graphically the direction of potential sources of particulate matters. According to statistical analyses of our data quantitative differences appeared in the pollution patterns between weekdays and weekends.

  • PDF

Change of the Size-Resolved Aerosol Concentration Due to Relative Humidity (습도 변화에 따른 에어로졸의 농도 및 크기의 변화경향 파악)

  • Jung, Chang Hoon;Park, Jin Hee;Kim, Yong Pyo
    • Particle and aerosol research
    • /
    • v.9 no.2
    • /
    • pp.69-78
    • /
    • 2013
  • In this study, the atmospheric aerosol concentration measured at different relative humidity levels was analyzed. Using an optical particle counter, PM10 and PM2.5 concentration as well as particle size distribution were measured and the relation between these size resolved data and relative humidity was studied. The results showed that mass concentration increases as relative humidity increases. The comparison between PM1, PM2.5 and PM10 showed that the fine particles grow more than coarse particles as relative humidity increases. The results also showed that PM10-2.5 and relative humidity do not show close correlation, which means that the mass increase of PM10 at high relative humidity is mainly due to the growth of PM2.5.

Chemical Characteristics and Particle Size Distribution of PM10 in Iron and Steel Industrial Complex (포항철강공단 미세먼지(PM10)의 입경분포 및 화학적 특성)

  • Jung, Jong-Hyeon;Lee, Hyung-Don;Jeon, Soo-Bin;Yoo, Jeong-Kun;Shon, Byung-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.13 no.11
    • /
    • pp.5601-5609
    • /
    • 2012
  • The fine particulate matter($PM_{10}$) concentrations and contents were measured to check the health and environment influential factors in Pohang Iron and Steel Industrial Complex and its vicinities. In addition, the $PM_{10}$ distribution for each year and season was surveyed using the regional air quality monitoring stations. The measuring on the $PM_{10}$ inside the industrial complex showed $61.3{\pm}12.1{\mu}g/m^3$ for average concentration of $PM_{10}$ which was measured by Dongil Industry and $44.3{\pm}8.1{\mu}g/m^3$ measured by steel manufacturing industry complex management office. Both of them satisfied the environmental air quality standard. The percentage of $SO_4{^2}$, $NO_3{^-}$, $NH_4{^+}$ which are the secondary ions created out of the $PM_{10}$ in Dongil Industry and steel manufacturing industry complex management office was checked and it was revealed that the percentage of ${SO_4}^{2-}$ was high and it is considered that the pollution source related with the sulfides exist at the industrial complex. They were in order of ${SO_4}^{2-}$ > $Cl^-$ > $NO_3{^-}$ > $F^-$ > $NH_4{^+}$ in Dongil Industry and ${SO_4}^{2-}$ > $Cl^-$ > $NO_3{^-}$ > $NH_4{^+}$ > $F^-$ in steel manufacturing industry complex management office.

The Effects of Supply Chain Management on Project Manager's Capability and Sustainable Benefit Sharing in Global Leading Companies (글로벌 리딩 기업의 공급사슬관리가 프로젝트 관리자의 역량과 지속가능 성과공유에 미치는 영향)

  • Park, Jugyeong;Lee, Seol-bin
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.19 no.2
    • /
    • pp.548-560
    • /
    • 2018
  • This study was conducted to evaluate the effects of SCM on PM's capabilities and sustainable benefit sharing in leading global companies. To achieve this, statistical analyses were carried out through an empirical questionnaire survey of 426 PMs in SCM companies. The results showed that SCM commitment, vision and goal sharing have positive effects on PM's capabilities in leading global companies, boosting PM capability. Moreover, sustainable benefit sharing was improved along with SCM trust building, vision and goal sharing in global leading companies, supporting the usefulness of these variables. In contrast, SCM information sharing and trust building did not lead to significant acceleration of PM's capabilities, rejecting these variables. These findings indicate that SCM information sharing or trust building does not really help simple members to accelerate PM's capabilities.

Characteristics of the Springtime Weekday/Weekend on Mass and Metallic Elements Concentrations of PM10 and PM2.5 in Busan (부산지역 봄철 주중/주말의 PM10과 PM2.5 질량농도와 금속이온농도 특성)

  • Jeon, Byung-Il
    • Journal of Environmental Science International
    • /
    • v.24 no.6
    • /
    • pp.777-784
    • /
    • 2015
  • This study investigates weekday/weekend characteristics of $PM_{10}$ and $PM_{2.5}$ concentration and metallic elements in Busan in the springtime of 2013. $PM_{10}$ concentration on weekday/weekend were 77.54 and $67.28{\mu}g/m^3$, respectively. And $PM_{2.5}$ concentration on weekday/weekend were 57.81 and $43.83{\mu}g/m^3$, respectively. Also, $PM_{2.5}/PM_{10}$ concentration ratio on weekdays/weekend was 0.75 and 0.65, respectively. The contribution rates of Na to total metallic elements in $PM_{10}$ on weekday/weekend were 38.3% and 38.9%, respectively. It would be useful in control effectively with management of urban fine particle to understand characteristics of fine particle concentration on weekday/weekend.

Effects of Diluents and Cryoprotectants on Sperm Cryopreservation of Mason Salmon, Oncorhynchus masou masou (산천어(Oncorhynchus masou masou) 정자의 냉동보존에 미치는 희석액과 동해방지제의 영향)

  • Lim, Han-Kyu;Lee, Cheul-Ho;Min, Byung-Hwa;Lee, Jung-Uie;Lee, Chae-Sung;Seong, Ki-Baik;Lee, Sang-Mok
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.41 no.4
    • /
    • pp.267-271
    • /
    • 2008
  • We experimentally determined the physico-chemical properties of seminal plasma as well as the sperm cryopreservation techniques of masou salmon, Oncorhynchus masou masou. Seminal plasma contained $18{\pm}1mmol/L$ potassium, $144{\pm}4mmol/L$ sodium, $116{\pm}3mmol/L$ chloride, $83.2{\pm}3.1mg/L$ calcium, $14.8{\pm}0.7mg/L$ magnesium, $45{\pm}9mg/L$ glucose, and $1.0{\pm}0.0g/L$ total protein. The osmolality and pH of seminal plasma were $287{\pm}7\;and\;7.7{\pm}0.1mmol/kg$, respectively, and the spermatocrit was $28{\pm}2$. The rate of embryonic survival at the eyed-stage and the hatching rate were highest in 10% methanol with 300 mM glucose. Compared to DMSO or glycerol, methanol served as a better cryoprotectant of masou salmon sperm.

Nurses' Knowledge and Performance of Pain Management at a General hospital (일 개 종합병원 간호사의 통증관리 지식과 통증 관리 수행)

  • Han, Ji-Young;Park, Hyun-Sook;Jin, Mi-Jung
    • Journal of Korean Academy of Fundamentals of Nursing
    • /
    • v.23 no.1
    • /
    • pp.6-11
    • /
    • 2016
  • Purpose: This study was done to describe level of knowledge and performance of pain management by nurses in general hospitals. Methods: The study was conducted from August 1 to 28, 2014 with 141 nurses from a general hospital in B city. Data were analyzed using descriptive statistics, t-test, one-way ANOVA, and Pearson correlation coefficient with SPSS 20.0. Results: Average correct response rate for knowledge was 62.7%, indicating poor knowledge of pain management. Mean score for knowledge of pain management was $31.33{\pm}3.24$ out of 50(general knowledge about pain $14.02{\pm}2.18$ out of 20, knowledge on use of analgesics $9.21{\pm}1.97$ out of 20, knowledge on analgesic classification $8.16{\pm}1.00$ out of 10). Mean score for performance of pain management was $3.19{\pm}.44$ out of 4. There was significant difference in knowledge of pain management by age. Performance of pain management differed significantly according to age and type of working unit. No significant relationship was found between knowledge and performance of pain management. Conclusion: These findings show that nurses who have good knowledge do not always have good performance of pain management. Therefore, it is necessary to develop new strategies to promote performance as well as continued pain management education to increase ability of nurses to manage pain.

A Study on Operational Status and Management Satisfaction of Dental Laboratories (치과기공소 운영실태 및 경영만족도 조사)

  • park, Jong-Hee
    • Journal of Technologic Dentistry
    • /
    • v.38 no.1
    • /
    • pp.23-36
    • /
    • 2016
  • Purpose: The purpose of this study is to suggest direction for dental technicians and management of dental laboratories to contribute to the improvement of oral health of citizens with high-quality dental prosthesis by researching operational status and management satisfaction of dental laboratories. Methods: In order to investigate operational status and management satisfaction of dental laboratories, this study conducted a questionnaire survey by mailing questionnaires to heads of dental laboratories designated as clinical training workshops of Department of Dental Technology of G University and a total of 158 questionnaires were used for analysis. Results: As for gender, males were 142 persons (89.9%) and females were 16 persons (10.1%). For location of the laboratories, number of laboratories in metropolitan cities was 94 (59.5%) while small and that in mid-sized cities was 64 (40.5%). As for the satisfaction with job, those who have managed dental laboratories for 23-30 years ($1.92{\pm}77$), transact with 7-12 dental clinics ($1.70{\pm}75$), had monthly income of 4-8 million won ($1.74{\pm}.80$) and had 8-10 employees ($2.33{\pm}.68$) were the highest in their satisfaction. As for satisfaction with management, those who have managed their business for 15-20 years ($2.86{\pm}.52$), transact with more than 20 dental clinics ($2.00{\pm}.04$), had monthly income of less than 4 million won ($2.00{\pm}.85$) and had less than 3 employees ($2.00{\pm}.62$) were the highest in their satisfaction. As for monthly income, those with less than 2 million won were 24 persons (15.2%), 2-4 million were 64 persons (40.5%), 4-6 million were 40 (25.3%), 6-8 million were 14 (8.9%) and over 8 million won were 16 persons (10.2%). As for number of employees, those with less than 3 employees were 32perosns (20.3%), 4-7 were 82 (51.9%), 8-10 were 26 (16.5%) and more than 11 were 10 persons (6.3%). As for severance payment, 84 persons practiced it according to Labor Standard Act (53.2%) and 34 practice it to a proper degree (21.5%) while 20 did not practice it at all (12.7%) and 20 persons did not respond to the question (12.7%). Conclusion: Although dental laboratories have rapidly expanded in number from 473 in 1986 to 2,400 in 2015, dental technician circles are facing difficulty in their management due to fierce competition and low profitability. Therefore, in order to improve this problem, it is necessary to readjust prices for dental prosthesis to realistic ones.

A Practical Approach to the Real Time Prediction of PM10 for the Management of Indoor Air Quality in Subway Stations (지하철 역사 실내 공기질 관리를 위한 실용적 PM10 실시간 예측)

  • Jeong, Karpjoo;Lee, Keun-Young
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.65 no.12
    • /
    • pp.2075-2083
    • /
    • 2016
  • The real time IAQ (Indoor Air Quality) management is very important for large buildings and underground facilities such as subways because poor IAQ is immediately harmful to human health. Such IAQ management requires monitoring, prediction and control in an integrated and real time manner. In this paper, we present three PM10 hourly prediction models for such realtime IAQ management as both Multiple Linear Regression (MLR) and Artificial Neural Network (ANN) models. Both MLR and ANN models show good performances between 0.76 and 0.88 with respect to R (correlation coefficient) between the measured and predicted values, but the MLR models outperform the corresponding ANN models with respect to RMSE (root mean square error).

Temporal and Spatial Distribution of Particulate Carcinogens and Mutagens in Bangkok, Thailand

  • Pongpiachan, Siwatt;Choochuay, C.;Hattayanone, M.;Kositanont, C.
    • Asian Pacific Journal of Cancer Prevention
    • /
    • v.14 no.3
    • /
    • pp.1879-1887
    • /
    • 2013
  • To investigate the level of genotoxicity over Bangkok atmosphere, $PM_{10}$ samples were collected at the Klongchan Housing Authority (KHA), Nonsree High School (NHS), Watsing High School (WHS), Electricity Generating Authority of Thailand (EGAT), Chokchai 4 Police Station (CPS), Dindaeng Housing Authority (DHA) and Badindecha High School (BHS). For all monitoring stations, each sample covered a period of 24 hours taken at a normal weekday every month from January-December 2006 forming a database of 84 individual air samples (i.e. $12{\times}7=84$). Atmospheric concentrations of low molecular weight PAHs (i.e. phenanthrene, anthracene, pyrene and fluoranthene) were measured in $PM_{10}$ at seven observatory sites operated by the pollution control department of Thailand (PCD). The mutagenicity of extracts of the samples was compared in Salmonella according to standard Ames test method. The dependence of the effects on sampling time and on sampling location was investigated with the aid of a calculation of mutagenic index (MI). This MI was used to estimate the increase in mutagenicity above background levels (i.e. negative control) at the seven monitoring sites in urban area of Bangkok due to anthropogenic emissions within that area. Applications of the AMES method showed that the average MI of $PM_{10}$ collected at all sampling sites were $1.37{\pm}0.10$ (TA98; +S9), $1.24{\pm}0.08$ (TA98; -S9), $1.45{\pm}0.10$ (TA100; +S9) and $1.30{\pm}0.09$ (TA100; -S9) with relatively less variations. Analytical results reconfirm that the particulate PAH concentrations measured at PCD air quality monitoring stations are moderately low in comparison with previous results observed in other countries. In addition, the concept of incremental lifetime particulate matter exposure (ILPE) was employed to investigate the potential risks of exposure to particulate PAHs in Bangkok atmosphere.