• Journal of Korean Society on Water Environment
• /
• v.21 no.3
• /
• pp.242-247
• /
• 2005

In this study, we investigated the removal efficiencies of pollutants and permeate fluxes depending on chemistry of feed water, various molecular weight cut-offs (MWCOs) and materials of membrane, operating pressure. We used seven MWCO membranes of YC0.5, YM1, YM3, YM10, YM30, YM100 and PM30, humic acid solution and surface water as feed water, and examined variation in permeate flux. Results of TOC removal experiment demonstrate that MWCO lower 1,000daltons could remove humic acid effectively. As increasing solution pH and decreasing divalent cations ($Ca^{2+}$) concentration, TOC removal increased. But $UV_{254}$ removal efficiency increased with higher divalent cation concentration and solution pH. Membrane fouling increased with increasing electrolyte (NaCl), divalent cation concentration and decreasing solution pH. In spite of initial permeate flux of the hydrophobic membrane (PM30) was higher than that of the hydrophilic membrane (YM30), flux decline of PM30 was significant during operation. At higher operating pressure, compactness of the cake layer on the membrane surface increased, resulting in gradual increase in hydraulic resistance.

• Journal of Korean Academy of Fundamentals of Nursing
• /
• v.13 no.2
• /
• pp.242-248
• /
• 2006

Purpose: The purpose of this study was to identify the effects of a BeHaS exercise program on pain, health status, body weight in middle-aged women who have osteoarthritis in their knees. Method: The participants in this study were eighteen women whose mean age was 56.22years and who had osteoarthritis in the knees. The BeHaS exercise program consists of approximately one and half hour of exercise, two days per week, for twelve weeks. Data were gathered from September 2005 to December 2005 using a questionnaire and measuring VAS for pain, KWOMAC for health status, body weight for scale. Data were analyzed with the SPSS Win 11.0 using frequency and paired t-test for differences between pre-exercise and post-exercise. Results: The results of this study are as follows: Scores for pain on post test were statistically lower than pre test(t=4.202, p=0.001), health status was statistically improved after exercise program (t=3.479, p=0.002). But body weight did not change(t=-.774, p=0.222). Conclusion: From these results, it is concluded that the BeHaS exercise program can be effective in decreasing pain and increasing health status in middle-aged women with knee osteoarthritis.

• Journal of Preventive Medicine and Public Health
• /
• v.52 no.4
• /
• pp.242-249
• /
• 2019

Objectives: Elderly individuals with diabetes should maintain a normal body mass index (BMI) to help control their blood glucose levels. This study investigated barriers to physical activity (PA), self-efficacy to overcome those barriers, and PA self-efficacy among elderly individuals with diabetes in relation to BMI. Methods: This cross-sectional study included 56 participants. Data were collected by a questionnaire interview and direct measurements for anthropometric data. PA self-efficacy was measured using 8 questions describing different levels of PA, where participants rated the strength of their belief that they could engage in that activity. Self-efficacy to overcome barriers was measured using 10 questions capturing participants' confidence in their ability to engage in PA despite different possible barriers. Mean scores for these parameters were analyzed using the chi-square test and the independent t-test. Results: In total, 89.3% of participants had a low PA level and 58.9% had more than 3 hours of sedentary activity per day. Furthermore, 55.4% were obese and 14.3% were overweight. The mean scores for PA self-efficacy and self-efficacy to overcome barriers were $59.1{\pm}26.4$ and $52.5{\pm}13.8$, respectively. PA level was related to BMI (p<0.001; r=0.116) and sedentary activity (p<0.05; r=0.274). PA self-efficacy and age were not related to BMI. Barriers to PA were associated with PA levels (p<0.05). Conclusions: Physical inactivity was a major problem in elderly individuals with diabetes, and was correlated with higher BMI. Lower levels of PA might be mediated by sedentary activity.

• Parasites, Hosts and Diseases
• /
• v.57 no.3
• /
• pp.233-242
• /
• 2019

Detailed description of malaria in low transmission areas is crucial for elimination. The current study aimed to provide a comprehensive description for malaria transmission in Jazan, a low transmission district, southwestern Saudi Arabia. Patients at a tertiary care hospital were recruited in our study between August 2016 and September 2018. Malaria diagnosis was performed through a species-specific nested polymerase chain reaction (nested PCR), microscopy and Paramax-$3^{TM}$ rapid detection test (RDT). Malaria was detected in 30 patients by the PCR, with point prevalence of 10.9%. Of these malaria infections, 80% was imported, 26.6% was asymptomatic and 23.3% was sub-microscopic. Malaria was reported throughout the year, with February/March and September/October peaks. Infection was significantly more in males than in females (P=0.01). Likewise, infections were detected more in febrile than in non-febrile patients (P=0.01). Adult aged 15-24 years, fever and travel were identified as high-risk factors. Malaria was primarily attributed to Plasmodium falciparum mono-infections, followed by P. vivax mono-infections and lastly to falciparum/vivax mixed infections accounting 76.6%, 16.6%, and 6.6% of PCR-confirmed malaria cases, respectively. The nested PCR was superior to the smear microscopy (sensitivity 76.6%; specificity 100%) and the RDT (sensitivity 83.3%, specificity 94.2%). The overall percent agreement between microscopy and the RDT was 92.7% (kappa=0.63). High proportion of imported malaria including sub-microscopic and sub-patent cases were described. We suggest that incorporation of molecular tool into the conventional malaria diagnosis is beneficial in Jazan district.

• Korean Journal of Occupational Health Nursing
• /
• v.30 no.4
• /
• pp.232-242
• /
• 2021

Purpose: This study investigated the occupational status and job stress of visiting nurses during the COVID-19 pandemic. Methods: Participants were 151 visiting nurses working in the public health services in Seoul and Gyeonggi-do. The study was conducted using a structured online questionnaire. Results: The average age of the visiting nurses was 49.5 years. A occupational period was 38.4% of the participants had worked for a period of 6-10 years and 34.5% of them had worked for a period of 11 years or more. In terms of employment type, 74.8% had permanent contracts and 13.9% had fixed terms. 93.4% of nurses were working on COVID-19-related work; and 57.6% of them were working more than 50% of their work. Each visiting nurse provided health services for a total of 436.4 cases on average and the per day count was 14.3 cases. The service was provided through home visits or phone consultations. The results of the job stress were relationship conflict (60.92±20.72), job demand (59.05±14.10), job autonomy (57.83±14.63), job instability (45.25±27.37), organizational system (44.97±17.21), workplace culture (42.71±18.00), and inadequate compensation (35.29±18.14). There was a significant difference in job stress according to the proportion of COVID-19 work was 'workplace culture' (p=.023), Job autonomy (p=.053) and Inappropriate compensation(p=.054). Conclusion: In order to provide a stable working environment for visiting nurses and effective public visiting health services during unexpected circumstances, such as the COVID-19 pandemic, it is necessary to promote progressive policies and systemic improvements.

• Journal of Korean society of Dental Hygiene
• /
• v.23 no.6
• /
• pp.441-449
• /
• 2023

Objectives: This study was conducted to analyze the factors influencing the positive psychological capital, growth mindset, and self-leadership of dental hygienists in the Seoul and Gyeonggi regions with regard to their retention intention. The findings would serve as basic data for improving the retention intention. Methods: The methods espoused for analysis comprised independent sample t-test and ANOVA for group comparisons, Pearson's correlation analysis for examining the correlation between variables, and multiple regression analysis for identifying factors affecting retention intention. Results: Positive psychological capital was higher among those under the age of 27 and employed in dental clinics. Growth mindset was higher among those with less than three years of work experience and those working in clinics. Self-leadership was higher among those aged 28-31, and retention intention was higher among those under the age of 27 and with less than three years of work experience (p<0.05). A correlation was observed between positive psychological capital and self-leadership (r=0.760), self-leadership and retention intention (r=0.514), positive psychological capital and retention intention (r=0.505), positive psychological capital and growth mindset (r=0.337), and growth mindset and self-leadership (r=0.245) (p<0.001). Factors influencing the intention to stay at work were self-leadership (β=0.309) and positive psychological capital (β=0.242) (p<0.05). Conclusions: In order to improve dental hygienists' retention intention, it is necessary to devise strategies for improving positive psychological capital and self-leadership.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.7 no.4
• /
• pp.265-273
• /
• 2005

Chemical properties and heavy metal concentrations of forest soils of four abandoned coal mine lands affected by coal mining activities in the Mungyeong area were investigated to provide basic information for revegetation of abandoned coal mine lands. Soil pH in abandoned coal mine lands ranged from 5.30 to 6.76 it in the control site was 5.23. Contents of organic matter and total N in abandoned coal mine lands were $4.46\~7.19\%\;and\;0.07\~0.15\%$, respectively. Available P contents were 6.54 for A (Samchang), 6.52 for B (Bongmyeong),3.94 fur C (Kabjung), 5.45 mg/kg for D (Danbong coal mine land) and 5.25 mg/kg for the control site, which had a positive correlation with soil pH. Contents of exchangeable Ca, Mg, K and Na in abandoned coal mile lands averaged 196.1, 88.7, 88.2 and $10.2cmol^+/kg$, with a range of $132.1\~242.1,\;24.2\~138.\; 64.9\~120.8\;and\;8\~12.2cmol^+/kg$, respectively. Those of the control site were 192.8, 95.8, 104 and $21.2 cmol^+/kg$, respectively. Heavy metals such as Al, As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn of forest soil in abandoned coal mine lands have a larger content than those of the control site. Al, Mn and fb content was especially high in abandoned coal mine lands. The Al content of forest soil in abandoned coal mine lands ranged from 397 to 917 ppm, which was considered to be high enough to inhibit tree growth. Therefore, it is suggested that soils of abandoned coal mine lands contaminated by mining activities need to be properly treated for remediation of environmental problems.

• Journal of Korean society of Dental Hygiene
• /
• v.11 no.2
• /
• pp.233-242
• /
• 2011

Objectives : The purpose of this study is to provide the basic data for searching for the method to induce more positive knowledges and attitudes about the old from the university students majoring in dental hygienics, health and social welfare university students majoring in the old, who will face the change of aging society directly. Methods : The study selected 1 school in Busan and Daegu respectively with convenience sampling from September 2010 to October 2010, performed questionnaire(self administered questionnaire) to 401 students majoring in dental hygienics, health and social welfare and achieved following conclusions. Results : 1. When the students without the education experience about the old have negative experiences, the degree of interest in the old was high and when they have positive experiences, the attitude score about the old was high(p<0.001). 2. For education experience about the old, the students majoring in dental hygienics have the lowest experiences(p<0.001). 3. For knowledge, attitude and behavior about the old depending on major, the students majoring in social welfare have the highest interest and for the knowledge about the old in physical area, the students majoring in health have the highest knowledge(p<0.01).4. The area related with the knowledge about the old showed significant correlation in all of physical, psychological and social area(p<0.001). 5. The factors giving effects to the attitude about the old were gender(p=.006), experience(p=.003) and education experience related with the old(p=.022) and the factors giving effects to the behavior about the old were experience(p=.036) and attitude about the old(p=.000). Conclusions : It is necessary to develop actual education program that can provide preliminary dental hygienists with positive attitude about the old and reflect a lot of matters related with psychological area and social area about the old. In addition, it is necessary to establish the opportunity to understand the old through voluntary service activity related with the old in connection with local community. It is necessary to recognize the old positively by showing the positive figure.

• Elastomers and Composites
• /
• v.38 no.3
• /
• pp.235-242
• /
• 2003

A vulcanization reaction characteristics of an isoprene rubber (IR)-modified natural rubber/carbon black (NR/CB) composite was studied using in-situ electrical property measuring technique. Since the electrical conductivity of the sample composite would be changed continuously during the vulcanization reaction by rearranging of the carbon black particles within the sample, volume resistivity (${\rho}$) might be obtained as a function or reaction time. A stabilization time ($t_i$), maximum reaction speed time ($t_p$), and volume resistivity at that time(${\rho}_p$) were defined from the data for the Arrhenius analysis. Volume resistivity ${\rho}$ showed a comparatively high value of ${\sim}10^8$ order before the reaction started, and dramatically decreased to be stabilized within $1{\sim}2$ minutes as soon as the reaction started. As the more time elapsed, thereafter, ${\rho}$ decreased monotonously to a certain constant value through a peak, ${\rho}_p$ at time $t_p$, which was considered as the maximum reaction rate. As a result, while $t_i$ values were comparatively constant as $1{\sim}2$ minutes, $t_p$ values showed to become shorter and shorter as the reaction temperature.

• Applied Biological Chemistry
• /
• v.39 no.6
• /
• pp.460-465
• /
• 1996

The production of bacterial protease and its characteristics were investigated with Bacillus subtilis globigii CCKS-118 which was isolated from Korean traditional soy sauce. The optimum culture condition of the strain for the production of alkaline protease was as follow : 2% soluble starch, 0.2% yeast extract, 0.1% $(NH_4)_2SO_4$, 0.2% $MgSO_4$, pH 7.5, $35^{\circ}C$ and 20h rs. The optimum pH and temperature for the enzyme action of alkaline protease producing Bacillus subtilis globigii CCKS-118 were pH 9.0 and $50^{\circ}C$, respectively. The enzyme was relatively stable at $pH\;6.0{\sim}9.0$ and at temperature below $40^{\circ}C$. The activity of the enzyme was inhibited by $Hg^{2+}$ whereas $Cu^{2+}$ gave rather activating effects on the enzyme activity. The enzyme was inhibited by phenylmethane-sulfonyl fluoride indicating serine pretense metal ion group are required for the enzyme activity. Km value was $1.242{\times}10^{-4}M$, $V_{max}$ value was $25.99\;{\mu}g/min$. This enzyme hydrolyzed casein more rapidly than the hemoglobin.