• Korea-Australia Rheology Journal
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• v.13 no.3
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• pp.109-123
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• 2001

A stress jump, defined as the instantaneous gain or loss of stress on startup or cessation of a deformation, has been predicted by various models and has relatively recently been experimentally observed. In 1993, Liang and Mackay measured shear stress jump data of xanthan gum solutions, and in 1996, Orr and Sridhar reported extensional stress jump data of Boger fluids. Shear stress jumps of suspensions and liquid crystal polymers have also been observed. In this contribution, experimental work as well as a variety of theoretical models, which are able to predict a stress jump, are reviewed.

• 대한예방의학회:학술대회논문집
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• 2000.10a
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• pp.81-82
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• 2000

• 대한예방의학회:학술대회논문집
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• 1998.10b
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• pp.305-306
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• 1998

• 대한예방의학회:학술대회논문집
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• 1998.10b
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• pp.103-104
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• 1998

• Safety and Health at Work
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• v.12 no.1
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• pp.133-135
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• 2021

The COVID-19 pandemic has resulted in movement restrictions being instituted globally and the cessation of work at many workplaces. However, during this period, essential services such as healthcare, law enforcement, and critical production and supply chain operations have been required to continue to function. In Singapore, measures were put in place to protect the workers from infection at the workplace, as well as to preserve the operational capability of the essential service in a COVID-19 pandemic environment. This paper critically analyses the measures that were implemented and discusses the extension to broader general industry.

• The Korean Journal of Applied Statistics
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• v.27 no.1
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• pp.21-30
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• 2014

Ordinary survival analysis cannot be applied when a significant fraction of patients may be cured. A cure rate model is the combination of cure fraction and survival model and can be applied to several types of cancer. In this article, the cure rate model is considered in the interval censored data with a cluster effect. A shared frailty model is introduced to characterize the cluster effect and an EM algorithm is used to estimate parameters. A simulation study is done to evaluate the performance of estimates. The proposed approach is applied to the smoking cessation study in which the event of interest is a smoking relapse. Several covariates (including intensive care) are evaluated to be effective for both the occurrence of relapse and the smoke quitting duration.

• Safety and Health at Work
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• v.7 no.4
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• pp.293-298
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• 2016

Background: The aim of this study was to increase knowledge regarding the dangers associated with tobacco use, and decrease secondhand smoke exposure and tobacco use behaviors with an antitobacco messaging campaign among rural, medically underserved, blue-collar workers. Methods: A quasiexperimental study was conducted with employees at two worksites. One worksite received the intervention, which consisted of nine different antitobacco messages. Baseline and follow-up surveys were conducted at each worksite to assess change in knowledge and behavior; the data were compared across the two worksites. Results: Two hundred twenty-two and 243 participants completed baseline and follow-up surveys at the intervention and comparison sites, respectively. A statistically significant difference was seen over time between the worksites on knowledge of the dangers of tobacco (p < 0.0001); the mean knowledge score increased at the intervention site, but remained unchanged at the comparison site. In general, non-smokers at both worksites appeared to try to decrease exposure to secondhand smoke over the follow-up period. Repeated measures analysis indicated that there were no differences in motivation to quit (p = 0.81), interest in quitting (p = 0.40), thinking about quitting (p = 0.53), or several tobacco-use behaviors over time among smokers at the intervention and comparison worksites. There were slight increases over time in the proportion of smokers who do not allow smoking in their homes/vehicles at the intervention worksite, although not statistically significant. Conclusion: Participants at the intervention worksite increased their knowledge regarding the dangers of tobacco use and secondhand smoke exposure. Among current tobacco users, the intervention appeared to increase family rules regarding secondhand smoke exposure in their homes and vehicles.

• The Journal of Pediatrics of Korean Medicine
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• v.32 no.3
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• pp.55-61
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• 2018

Objectives The study aimed to examine satisfaction of elementary school students parents' on the program by school doctor of Korean medicine. Methods The program by school doctor of Korean medicine has been conducted in 22 schools in Seoul since June 2017. The program includes Korean medicine health care lecture for the students, the teachers, and the parents, the diet management advice, smoking/drinking cessation, and sex education. The program was varied by schools. This study investigated the parents' satisfaction of the program by school doctor of Korean medicine by a survey. Results A total of 92 elementary school parents participated in the survey, 92.4% of the respondents answered that the school doctor program showed positive effects on students' health. Most of them replied positive regarding the health education about smoking cessation (82.5%). Also, the respondents were satisfied about overall health education from the program (89.1%), and improvements of the students' learning ability through regular health checkups (59.8%). Conclusions Parents who were participated in the program by school doctor of Korean medicine positively evaluated about the program. They also shared their expectations to the role of the school doctor of Korean medicine in improving student's immune system and health counseling for the students and the school faculty.

• Journal of Bio-Environment Control
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• v.22 no.1
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• pp.55-59
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• 2013

This study was evaluated that seasonal change of the hesperidin content was in relation to the skin color and weight of fruit in outer or inner side of the canopy, for determine the optimum time and the index of most abundant hesperidin content in lemon fruits juice. The hesperidin content was different with fruit growth and on fruit bearing site of the tree. The fruits of the either side contained the highest hesperidin value at 162 and 176 days after anthesis just after de-greening and the value was highest in the fruits of outer side of the canopy. This time also corresponded to the time just before the cessation of fruit growth. These results suggested that the optimum harvesting period for more hesperidin content was the stage just after de-greening and just before fruit growth cessation.

• Korea journal of population studies
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• v.29 no.2
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• pp.195-213
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• 2006

Follow-up surveys with 700 smoking male adults and 300 nonsmoking male adults were performed before 20-days and after one month, three months and six months since government's price increase enforcement. 572 smokers among 700 and 198 non-smokers among 300 were remained and followed up till the end of the surveys. The cessation rate of smokers are 6.6%(after one month), 10.3%(after three months) and 11.0%(after six months). Smoking cessation ratio of new smoking quilters who considered that price increase as a motive of their giving-up smoking are 76.3%, 81.3% and 65.1%. The smokers estimates of short-run price elasticities from follow-up surveys are -0.6853, -0.6230 and -0.5482 at each survey period. Including non-smokers, estimates of short-run price elasticities from follow-up surveys are -0.3920, -0.3739 and -0.3481 at each survey period. The effect of demand decrease caused by KR\500 price increase stayed with little difference for six months because price elasticities between each survey period showed no much change. Effectiveness and validity of tobacco control by price increase was confirmed through the survey results. Therefore if the government want to attain long term strategic goal to decrease general smoking rate among male adult smokers by 30%, the strong smoking prohibition policy, just like the price increase of December 2004, should be continuously driven.