• Journal of Ginseng Research
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• v.41 no.4
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• pp.578-588
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• 2017

Background: Elevated testicular temperature disrupts spermatogenesis and causes infertility. In the present study, the protective effect of enzymatically biotransformed Panax ginseng Meyer by pectinase (GINST) against chronic intermittent heat stress-induced testicular damage in rats was investigated. Methods: Male Sprague-Dawley rats (4 wk old, 60-70 g) were divided into four groups: normal control (NC), heat-stress control (HC), heat-stress plus GINST-100 mg/kg (HG100), and heat-stress plus GINST-200 mg/kg (HG200) treatment groups. Each dose of GINST (100 mg/kg and 200 mg/kg) was mixed separately with a regular pellet diet and was administered orally for 24 wk. For inducing heat stress, rats in the NC group were maintained at $25^{\circ}C$, whereas rats in the HC, HG100, and HG200 groups were exposed to $32{\pm}1^{\circ}C$ for 2 h daily for 6 mo. At week 25, the testes and serum from each animal were analyzed for various parameters. Results: Significant (p < 0.01) changes in the sperm kinematic values and blood chemistry panels were observed in the HC group. Furthermore, spermatogenesis-related molecules, sex hormone receptors, and selected antioxidant enzyme expression levels were also altered in the HC group compared to those in the NC group. GINST (HS100 and HS200) administration significantly (p < 0.05) restored these changes when compared with the HC group. For most of the parameters tested, the HG200 group exhibited potent effects compared with those exhibited by the HG100 group. Conclusion: GINST may be categorized as an important medicinal herb and a potential therapeutic for the treatment of male subfertility or infertility caused by hyperthermia.

• Journal of the East Asian Society of Dietary Life
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• v.14 no.6
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• pp.542-550
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• 2004

This study was aimed for examining the changes of eating habit and behavior according to the degree of stress of elementary school students. It was tried to identify their daily stress levels and their relevances with the changes of their eating habits and behaviosr. The subjects were 500 students from fifth and sixth grades in three elementary schools in Seoul. The students surveyed showed to get moderately stressed in general. The stress level of girls were higher than that of boys(p<0.001) in the individual area. The breakfast ratio of the low stressed group(LS) marked higher(p<0.001) than those of both the middle-(MS) and highly-stressed group(HS). In other words, the LS group had regular breakfast. The main reason why they were skipping breakfast was lack of time. The amount of a meal in the HS group was noticeably bigger than the other two groups(p<0.05) and the amount of salt and spices used was higher(p<0.01). The amount of food taken when they got stressed was increased remarkably higher in the HS group and students in that group had snacks as the way of relieving the stress. The HS group displayed higher ratio of the unbalanced diet habit. There were noticeable differences in the eating habit and behavior, i.e. the amount of meals, of salt used and whether eating breakfast or not, in accordance of the levels of stress.

• Journal of the Korea Society of Computer and Information
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• v.16 no.2
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• pp.17-23
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• 2011

In this paper, daily life stress monitoring system is proposed. The proposed wireless ECG module, reducing the noise and increasing the size of signal, amplification circuit was designed for. Using HRV(Heart Rate Variability), extracted by measuring R-wave, stress diagnostic algorithms to assess the stress of human emotion were developed. For monitoring the activities, the proposed system is consist of small rectangular size for portable and by simple measurement it is possible to measure at any time. Through experiments, the proposed approach to represent user's stress level can be confirmed. Through that, it can see appropriate structure to obtain R-wave for stress assess as well as high resemblance to the clinical electrocardiogram. In this paper, performed experiments was developed nonrestraint measuring and wearable wireless biometric scanner that is able to monitor the heart's electrical activity of everyday life.Using this, the algorithm system, that is able to assess stress index through time-domain and frequency-domain analysis of the front and the rear of performing stress load protocol, was developed,

• Journal of Medicine and Life Science
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• v.17 no.3
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• pp.86-93
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• 2020

The study aimed to understand medical students' experiences of emotional changes, including their method of adapting to experiences, and the effect of the experiences in shaping their identities. We interviewed 12 medical students who were finishing their 1-year clinical internship in 2016. Data on their opinions and reasons for emotional changes during their school life were obtained. The descriptive phenomenological approach was applied to analyze the interviews. Their stress came from disappointment in themselves, competitive environment, observing a change in their personalities, meeting their parents' expectations, and interpersonal relations. The interviewees adjusted to the medical study by exercising self-control in their studies and daily lives, by practicing self-acceptance and observing their state of mind, and by breaking free from the competition-driven environment and obsession with grades. In addition, they cultivated endurance and found external support. Finally, they achieved self-efficacy and were comfortable in their identity as medical students. They still had to address the stress from working relationships and the difficulty in balancing studies and life. The medical students' self-evaluation and compulsive tendencies increased during the medical course due to the burden of studies. They evolved by learning self-control and introspection and seeking ways to adapt. Understanding this growth process of medical students will improve student support in medical schools.

• Journal of Environmental Science International
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• v.20 no.12
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• pp.1599-1605
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• 2011

To evaluate heat environment surrounding plants diurnal change of leaf temperature in the broad-leaved deciduous and evergreen trees was measured with microclimatic environmental factors including global solar radiation, and upward and downward long wave radiation. Maximum daily solar radiation was 961.2 and 976.3 w/$m^2$ in August 9 and 23, respectively. Upward long wave radiation was slightly higher than downward long wave radiation, showing 404.2 w/$m^2$ in August 9 and 394.5 w/$m^2$ in August 23. In addition, daily maximum vapor pressure deficit was 5.42 and 6.84 kPa in August 9 and 23, respectively, indicating high evaporative demand. Quercus glauca and Acer mono was differently responded to changing light regimes. On August 9, leaf temperature at the top-positioned leaves of Acer plants was higher than air temperature as well as those of Quercus plants in the morning. This indicates that stomata in Acer plants were closed by heat stress or water stress in the morning, while Quercus plant maintained active transpiration by opening stomata. These results indicated that improved light regimes such as gap opening in the closed forest may not always affect positively in the physiology of understory plants.

• Journal of Families and Better Life
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• v.27 no.6
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• pp.65-82
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• 2009

The following research aimed to determine the effect of stress among middle school students on their addiction to the Internet. This research's target was a group of male students who had a high probability of getting addicted to the Internet while playing c/t games. The study distributed 357 questionnaires and used 340 copies, which meant discarding 17 copies that were considered inadequate. The research results are as follows: First, there appeared subordinate factors in the stress suffered by the students. These included stress from their families, from conflicts with their teachers, from the living environment, current schoolwork and future course in college, insecurity over their physical appearance, bullying from other students, and relationships with friends. Among these factors, stress caused by conflicts with teachers and family was the most frequently cited, while stress from their friends was the least cited. The motive in using the Internet was found to be bound with several factors. These include: a form of diversion, a way to communicate with others, a means in coping with loneliness, a source of news and information, a form of passing away time, a kind of habit, and others. Among these motives, passing away time and indulging a habit were cited the most, followed by news and information search, and a form of diversion. Second, as a subordinate factor in Internet addiction, the following were cited: formation of tolerance, health issues, occurrence of problems related to daily life, satisfaction or a pleasant sensation, withdrawal, cover-up on the use of the Internet, and formation of virtual interpersonal relationships, and others. Among these, the formation of tolerance came out the highest, followed by health issues, daily life, and problems related to daily life. Third, in terms of the effects of stress on the motive in using the Internet, the research found that the more the students felt stressed out by conflicts with their teachers and family, the more they tended to use the Internet to communicate with others, to cope with loneliness, to obtain newsI and information, to passawaytime, and to indulge a habit Also, the more they felt stressed out by the living environment, the more they tended to use the Internet to communicate with others, to cope with loneliness, and use news and information. The more they felt stressed out by their schoolwork and future course in college, they tended to use the Internet as a form of diversion and to secure news and information. The more they felt stressed out by their insecurity over their physical appearance and being victimized by bullies, the more they tended to use the Internet to cope with loneliness. Fourth, as for the effect of several variables on student addiction to the Internet, the study found that the more students felt stressed out by their living environment, by schoolwork and future course in college, by their physical appearance, and bullying from other students, the more they used the Internet as a form of diversion, a communication tool, and as a means of passing away time or indulging a habit. The study came up with the finding that the more the students used the computer and the Internet, the probability of their getting addicted to the Internet got higher.

• Journal of Korean Academy of Nursing
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• v.39 no.4
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• pp.480-489
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• 2009

Purpose: The purpose of this study was to identify the factors which influence health-related quality of life (HRQoL) in Korean Medicaid beneficiaries. The relationships among sociodemographic factors, health status, health behavior, and HRQoL were analyzed. Methods: Data from the 2007 survey on Health Services Use and Health Status of Medicaid Beneficiaries conducted by the Ministry for Health Welfare and Family Affairs were examined. To analyze the sample survey data, descriptive statistics, correlation and hierarchical multiple survey regression analysis with SAS 9.1.3 package were used with SURVEYMEANS and SURVEYREG procedures, which incorporate the sample design into the analyses in order to make statistically valid inference for the whole Medicaid population. Results: The HRQoL correlated with limitations in Activities of Daily Living (ADL) (r=-.509, p<.001), stress (r=-.387, p<.001), depression (r=-.385, p<.001), alcohol consumption (r=.216, p<.001), and exercise (r=.293, p<.001). Significant factors that affect HRQoL of Medicaid beneficiaries were gender, region, limitations in ADL, stress, depression, alcohol consumption, and regular exercise. These variables explained 44.6% of HRQoL (F= 215.00, p<.001). Conclusion: The results indicate that to improve the HRQoL of Medicaid beneficiaries it is important to develop nursing intervention programs that focus on psychological health and health behavior and to give consideration to differences in gender and region.

• Journal of dental hygiene science
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• v.16 no.4
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• pp.310-316
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• 2016

The purpose of this study was to investigate the relationship between stress and oral symptoms, and quality of life in university students. This survey was performed on 452 university students in the Daejeon area. The research was conducted during 2 weeks in June 2016 using a self-reported questionnaire. The data were analyzed by PASW Statistics ver. 18.0. According to the findings of the study, higher levels of stress were detected in girls than in boys (p<0.05). Stress had a significant impact on the symptoms of dry mouth, bad breath, and temporomandibular pain (p<0.05). The high-stress group experienced a negative impact on oral impacts on daily performance (OIDP) scores as compared to the group with lower stress. Stress had a significantly positive correlation with dry mouth, bad breath, temporomandibular joint (TMJ). OIDP was a significant positive correlation with dry mouth, bad breath, TMJ and stress. The findings of the study showed that stress exerted a significant influence on the oral symptoms and quality of life in university student.

• Animal Bioscience
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• v.35 no.3
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• pp.503-510
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• 2022

Objective: This study was performed to determine the effects of stress after road transportation and oral administration of chromium and meloxicam on growth performance, plasma cortisol, serum metabolites, and behavior in dairy calves. Methods: A total of 50 Holstein heifers (average body weight [BW]: 172±4.19 kg; average age: 5.53±0.12 months) were randomly assigned to five groups including NL (not transported + D-lactose; 1 mg/kg BW), TL (transported + D-lactose; 1 mg/kg BW), TC (transported + chromium; 0.5 mg/kg dry matter [DM] feed), TM (transported + meloxicam; 1 mg/kg BW), and TMC (transported + combination of meloxicam and chromium; 1 mg/kg BW and 0.5 mg/kg DM, respectively). Doses of D-lactose monohydrate, meloxicam, and chromium were prepared for oral administration by suspension in 15 mL of water in a 20-mL dosing syringe. Blood was collected before transportation, immediately after 120 km of transportation (IAT), and at 6, 24, and 48 h after transportation. Results: Neither transportation nor administration of meloxicam and/or chromium affected (p = 0.99) average daily gain and feed intake. Plasma cortisol concentrations in the NL group (average 0.13 and 0.18 nmol/L, respectively) were lower (p<0.001) compared to the TL group (average 0.39 and 0.61 nmol/L, respectively) at IAT and 48 h after transportation. At 48 h after transportation, cortisol concentrations were lower (p<0.05) in the TC group (average 0.22 nmol/L) than in the TL group (average 0.61 nmol/L), and TC calves had similar cortisol concentrations to NL calves. Lying duration (min/d) was shorter (p<0.05) in the TL group than in the NL group at 2 d after transportation. Lying duration was longer (p<0.05) for the TC and TMC groups than for the TL group at 2 d after transportation. Conclusion: Transportation increased cortisol concentrations and affected lying behavior, while chromium administration reduced cortisol concentrations and changed lying behavior. Thus, chromium administration before transportation may be a viable strategy to alleviate stress elicited by road transportation.

• Research in Community and Public Health Nursing
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• v.15 no.2
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• pp.323-331
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• 2004

Purpose: To examine nursing students' experiences in visiting care practice in community. Method: According to phenomenological method and Collaizzi's data analysis, all data were collected from March to June 2002 through written daily reports by 56 students in the visiting care unit of four public health centers. Four researchers had sought the daily reports for significant data. Result: In the research, 118 significant statements were selected and 33 subject groups were organized from the statements. From the 33 groups were identified 10 categories finally. which were as follows: stress, reflecting the nursing identity, considering the meaning of life, importance of family, necessity of social interest, compassion, worth of visiting care, the limits of visiting nursing care, identified characteristics of clients, both sides of the role model. Conclusion: Through visiting care practice, nursing students experienced stress, nursing identity, both sides of role model, and the worth and limits of visiting care, students felt the necessity of systems for lower classes and considering general characteristics of the clients. Above all, they came to have a wider perspective of the society through the practice.