• Asian-Australasian Journal of Animal Sciences
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• v.18 no.4
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• pp.463-469
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• 2005

An attempt was made to analyze the factors affecting mating performance of rams in pen mating systems. Due to many types of social interactions, mating performance of rams may decrease or increase. Six intact Muzaffarnagari rams were used and divided into three dominant subordinate pairs by food and ewe competition test. For dominant rams subordinate ram became competitor and vice versa. In the first experiment, ram was exposed to ewe but the competitor ram was kept outside the pen with the facility of visibility only. In the second experiment each ram was exposed to ewe along with the competitor ram and in third experiment ram was exposed to ewes (two) along with competitor ram in observation pen. Recordings of different mating and agonistic behaviour were done in all the experiments. It was found that subordinate ram's mating behaviour was inhibited by mere presence of a dominant ram out side without physical contact. However, when ram exposed to oestrus ewe(s) along with competitor ram, both dominant and subordinate rams spent much of their time in guarding activities instead of mating. In addition dominant ram tried to curtail the subordinate ram mating by agonistic interaction like fight and butting. Different guarding activities were observed either as active or passive type depending on level of dominanace. It was concluded that in a limited space the interaction of two or more rams might affect the number of services adversely.

• Journal of Preventive Medicine and Public Health
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• v.40 no.5
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• pp.337-344
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• 2007

Objectives: This study was performed to investigate the level of quality of life (QOL) and to identify its related factors among the elderly using a hall for the aged. Methods: The study subjects were 350 elderly people living in Nam Gu, Gwangju City. They were interviewed by questionnaire to collect information on social-demographic characteristics, health behaviors, health-related characteristics and QOL. We used statistical analysis methods such as T-test, ANOVA and multiple regression analysis to find which factors affected QOL. Results: The characteristics relating to physical functions were as follows: presence of spouse, education, alcohol drinking, teeth condition, arthritis, frequency of visiting the hall for the aged, and depression. Age, arthritis and depression were significantly related to role limitation due to physical problems. General health was related to gender, age, and depression, and vitality was related to education, frequency of visiting the hall, and depression. Role limitation due to emotional problems was related to age and depression, and mental health was related to age, hypertension, arthritis and depression. Conclusions: This study showed QOL of the elderly was significantly influenced by socio-demographic factors, and physical or emotional conditions. To improve QOL of the elderly, we need to develop programs to promote health and to manage chronic diseases of the elderly.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.4 no.6
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• pp.1311-1326
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• 2010

Peer-to-peer (P2P) networks consume the most bandwidth in the current Internet and file sharing accounts for the majority of the P2P traffic. Thus it is important for a P2P file sharing application to be efficient in bandwidth consumption. Bandwidth consumption as much as downloaded file sizes is inevitable, but those in file search and bad downloads, e.g. wrong, corrupted, or malicious file downloads, are overheads. In this paper, we target to reduce these overheads even in the presence of high volume of malicious users and their bad files. Sybil attacks are the example of such hostile environment. Sybil attacker creates a large number of identities (Sybil nodes) and unfairly influences the system. When a large portion of the system is subverted, either in terms of the number of users or the number of files shared in the system, the overheads due to the bad downloads rapidly increase. We propose ELiSyR, a file search protocol that can tolerate such a hostile environment. ELiSyR uses social networks for P2P file search and finds benign files in 71% of searches even when more than half of the users are malicious. Furthermore, ELiSyR provides similar success with less bandwidth than other general efforts against Sybil attacks. We compare our algorithm to SybilGuard, SybilLimit and EigenTrust in terms of bandwidth consumption and the likelihood of bad downloads. Our algorithm shows lower bandwidth consumption, similar chances of bad downloads and fairer distribution of computation loads than these general efforts. In return, our algorithm takes more rounds of search than them. However the time required for search is usually much less than the time required for downloads, so the delay in search is justifiable compared to the cost of bad downloads and subsequent re-search and downloads.

• Journal of Engineering Education Research
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• v.11 no.3
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• pp.78-89
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• 2008

This paper analyses the codes of ethics of eight engineering societies in USA and Korea focusing on fundamental canons, and major findings are as follows. Firstly, engineering societies in Korea began to make a code of ethics recent1y. Secondly, codes of ethics in USA have similar contents by mutual learning contrary to Korean cases. Thirdly, some codes of ethics in Korea are very poor and their presence are not well perceived. Fourthly, codes of ethics in Korea don't cover comprehensively responsibility to the public, to employers or clients, and to the profession. Fifthly, engineering societies in USA hold paramount the safety, health, and welfare of the public. Sixthly, new social issues including sustainable development are well discussed in the codes of ethics in USA.

• Physical Therapy Korea
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• v.15 no.1
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• pp.77-85
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• 2008

The self-report measure is a useful tool for evaluating self-recognized disability and difficulty in daily living activities. Although many studies and clinics used the Neck Pain and Disability Scale (NPDS) for measuring neck pain and functional impairment, there has not been much adaptation of this for use with Korean patients. The purpose of this study was to establish the reliability and validity of NPDS among Korean neck pain patients. Fifty-five subjects (32 males, 23 females) with neck pain enrolled in this study. They completed standardized self-administered questionnaires. The NPDS measures pain intensity; its interference with vocational, emotional, recreational, social, and functional aspects of living; and the presence and extent of associated factors. Reliability was determined by the intraclass correlation coefficient (ICC) and Cronbach's alpha for internal consistency. Validity was examined by correlating the NPDS scores to the Visual Analog Scale (VAS) score. The test-retest reliability of the translated versions of the NPDS was good ICC (2,1)=.86 (95%CI .76~.92). Cronbach's alpha value for NPDS was found to be .93, and this was statistically significant (p<.05). The criterion-related validity coefficient was .79 (p<.Oll. We conclude that the Korean version of NPDS has been shown to be a reliable and valid instrument for the assessment of neck pain. Successful linguistic and cultural translation will admit appropriate cross-cultural comparison for clinical analysis. Therefore, this study can be expected to be used as an adequate evaluation scale for neck pain related studies and treatments.

• Environmental and Resource Economics Review
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• v.19 no.3
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• pp.459-483
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• 2010

This paper constructs the two-part tax-a combined form of output tax and entrance fee-for polluting oligopolists under endogenous entry. In the presence of external damage that varies exogenously with aggregate output, we show that the two-part tax produces the ex post Pigouvian rule and thus achieves the first-best optimum. We also examine a detailed analysis of the impact of the two-part tax on social welfare and government revenues. Finally, when estimation errors exist in the process of regulation, we identify the incentive conflicts between interest groups and analyze the effects of estimation errors on determining optimal tax. In particular, we show that if the regulator takes care of both welfare loss and revenue gain under the proposed two-part tax, not only over-estimation on the slope of external damage but also under-estimation on the slope of market demand should be taken into the policy consideration.

• Journal of the Ergonomics Society of Korea
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• v.32 no.6
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• pp.495-501
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• 2013

Objective: The purpose of this study was to survey of the subjective health status of the elderly farmer. Background: With increase of aged population, the health of the elderly farmer has become main concerns of the elderly in the rural community. For the effects of the factors related to quality of life, subjective health condition showed the largest influence. Method: The survey was conducted by 326 elderly farmers aged 50 and older in rural areas through structured questionnaires. Survey questionnaire consisted items of general characteristics, health-related life habits, levels of stress(SF-PWI), symptom of musculoskeletal diseases and general level of health(SF-36). For the data analysis, SPSS 19.0K was used, and analysis was conducted by using frequency, percentage, mean, and standard deviation. For the symptom prevalence of musculoskeletal disorders and comparison of average level of health, chi-square test and t-test were used. Results: The results of the study are as follows. It was shown that the symptom prevalence of musculoskeletal disorders had a significant difference in gender (p<0.01). Frequency analysis on presence of musculoskeletal symptoms in each part of body showed that leg/knee region was 28.1%, back region was 26.6%, shoulder region was 18.0%, arm/elbow region was 11.9%, hand/wrist region was 8.2% and neck region was 7.2%. According to comparison of average level of health, a social functioning were the highest as score 87.3, followed by mental health(65.6) and role limitation-emotional(65.5). Conclusion: Health promotion program for the elderly and female in the rural are needed. Application: The survey of the subjective health status of the elderly should be used for planning factors to make a health improvement plan in elderly farmer.

• Journal of the Korean Data and Information Science Society
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• v.26 no.6
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• pp.1199-1206
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• 2015

into aging is the most rapidly increasing among the OECD countries. Consequently, this study aims at analyzing the forms of portfolio establishment by group, the factors affecting the old age preparation, and the presence of middle-aged households' preparation for the old ages in order to forestall social problems like the poverty ration of elderly that have been caused by the rapidly aging society. The result shows that the portfolio for the old age preparation can be expanded if a combination product of finance and real estate is developed as a means of old age preparation. Upon the results of the study above, it can be seen that the old age preparations differ according to not only the demographic elements, but also the extent to how much resources one holds. Especially, the various factors affecting the holding resources vary householder by household depending on whether they prepare for the old ages or not.

• Journal of Korean Academy of Nursing
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• v.46 no.6
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• pp.836-847
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• 2016

Purpose: The purpose of this study was to examine the association between utilization of home care services under the national long-term care insurance system and family caregiver distress. Methods: A secondary data analysis was conducted in this study using data collected in 2011 and 2012 from the Korean version of International Resident Assessment Instrument (interRAI) Home Care assessment system. The study sample included 228 clients receiving community based home care and their family caregivers in Korea. Descriptive statistics, $x^2$ test, t-test, and Heckman selection model analysis were conducted using SAS 9.3. Results: Presence of family caregiver distress was significantly associated with days of nurse visits (${\beta}$=-.89, p=<.001) and home helper visits (${\beta}$=-.53, p=.014). Level of caregiver distress was also significantly associated with days of nurse visits (${\beta}$=-.66, p=.028). Other factors which were significantly associated with caregiver distress were depression, cognitive function, inadequate pain control, social support for older adult, and caregiver relationship to the older adult. Conclusion: The results of this study show that visiting nurse service and appropriate support programs for Older Adults and family caregivers experiencing caregiver distress should be developed and provided to families based on the health care needs of older adults and their family caregivers for effective and sustainable home care.

• Journal of the Korea Society of Computer and Information
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• v.15 no.6
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• pp.129-138
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• 2010

The purpose of this study was to analyze the difference between Exercise addiction and Affect, and addiction-related potential was investigated. In addition, exercise addiction prevention and positive exercise was to identify. The participants of the study included 312 tennis club member who were more than 20 years old and lived in seoul city. The survey was analyzed by SPSS PC+ for window (version 12.0) which is a statistical analysis program to produce the computational results of this study. Based on the survey, this study could draw such results as follows: First, exercise addiction, gender and age on partial variables were statistically significant differences. A male positive addictions, exercise desire were higher than in female. 50s in the withdrawal symptoms of the variables that showed statistically significant difference participation, and period, frequency, time of exercise addiction showed that in withdrawal symptoms, positive addictions domain in a statistically meaningful differences. Second, social demographic domain in the presence of gender showed significant correlation exercise desire were and exercise participation time in the positive addictions showed significant correlation. Participation frequency and the time involved in retaining all the positive affect and negative affect have found a high correlation. Third, the influence of relation between exercise addiction and affect of tennis participants, exercise desire, positive addiction, showed in a statistically positive affect and negative affect meaningful influence on it.