• Journal of Korean Ophthalmic Optics Society
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• v.18 no.1
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• pp.37-43
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• 2013

Purpose: The present study was conducted to investigate whether the directions of eye movement in playing computer games for certain period affected the change of near point of convergence (NPC) and fusional reserve (FR) or not. Methods: Total 40 subjects in 20s who have the visual acuity of 1.0 or higher without any ocular disease and accommodative dysfunction were asked to successively play computer games. After the subjects were moving eyes in horizontal and vertical directions for 40 and 90 minutes, their horizontal fusional reserves, vertical fusional vergence and near point of convergence were measured. Results: The near point of convergence showed a tendency to be receded after computer gaming in the horizontal and vertical directions, and both of horizontal and vertical fusional reserves were significantly reduced. The range of declined fusional reserves and receded near point of convergence after computer gaming for 90 minutes was smaller than those after computer gaming for 40 minutes. The change of binocular vision was affected by the horizontal eye movement rather than the vertical movement when analyzed by the direction of eye movement. Conclusions: This study revealed that the change in FR and NPC was different along with dominant direction of eye movement during visual display terminal (VDT) tasks. Therefore, the adjustment of VDT working time is required to prevent the dysfunction of binocular vision according to the dominant direction of eye movement during VDT task.

• Korean journal of applied entomology
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• v.52 no.4
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• pp.341-348
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• 2013

We desinged and evaluated a remote-sensing sex pheromone trap for real-time monitoring of Mythimna separata (Lepidoptera: Noctuidae), a migratory insect in Korea. The system consisted of a modified cone-trap with a sex pheromone lure, a sensing module based on light interruption, a signal transmission module based on code division multiple access, a main electronic board for system control, a power supply based on a solar collector, a stainless steel-pole supporting the system, and a signal collection and display system based on an internet web page. The ratio (>92%) of the actual number of insects to the signal number in the remote-sensing trap was improved by sensing only within a limited period at night on the basis of the insect's circadian rhythm, control of signal sensitivity on the basis of sensing software programming, 1-h interval for signal transmission, and adjustment of the signal transmission program. The signal occurrence pattern in the remote-sensing trap was conclusively similar (correlation coefficient, >0.98) to the actual pattern of adult occurrence in the trap. The result indicated that the remote-sensing trap based on the attraction of the sex pheromone lure for M. separata has a promising potential for practical use. Occurrence of M. separata adults was observed several times in 2011 and 2012, and the peaks were sharp.

• The Journal of the Korea Contents Association
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• v.20 no.11
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• pp.101-109
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• 2020

This study sought to find out the impact of conflicts in social welfare organizations on job performance and to find out the effects of controlling participatory decision-making in their relationships. To that end, a survey was conducted on workers at social welfare centers in Seoul, Gyeonggi Province and Chungcheong Province, and 360 copies were finally used for analysis and Correlation and hierarchical regression and statistical significance analysis of the adjustment effects were performed. As a result, conflicts within the organization, job performance, and participatory decision-making showed a negative correlation, and as participatory decision-making in the relationship between conflict within the organization and job performance showed a controlled effect, the impact of conflicts within the organization on job performance was reduced. These results suggest that participatory decision-making can alleviate conflicts within an organization and at the same time increase job performance. Based on this, the following suggestions were proposed: They include conflict management strategies in the guidelines for social welfare subjects, establish guidelines for conflict management, provide training for workers, engage workers in employee evaluation and compensation system development, and operate permanent organizations such as the Conflict Handling Committee after investigating conflicts within social welfare organizations.

• The Journal of the Korea Contents Association
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• v.20 no.4
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• pp.331-347
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• 2020

In the modern economic area of service-based logic, the importance of the service industry continues to increase. Yet in spite of the various promotional policies of the government, growth remains at a standstill. It is now time to turn away from the outwardly visible form of the issue and to contemplate its root cause. This study thus investigated the service essentials based on philosophical thought in order to secure the continuous growth and competitive advantage of a service industry with an unshakable foundation. The effect of service essentials on job performance by service industry was also empirically analyzed. To conduct the study, a research hypothesis was verified by using the final 900 copies of survey data for service industry workers for data analysis. The results of the study on service essentials showed that interaction and harmony were found to have a positive effect on job performance in the transportation industry, while it verified the positive effects on job performance for interactivity and horizontality in the finance and insurance industry, and interactivity, horizontality and harmony in the hotel and resort industries. As a result, it was confirmed that service essentials had a partial effect on performance in the service industry. Various and in-depth studies on service essentials are thus required in the future, and it is also necessary to expand the parameters or adjustment variables that are capable of affecting performance.

• Journal of Chest Surgery
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• v.50 no.5
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• pp.363-370
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• 2017

Background: Extracorporeal life support (ECLS) is widely used in refractory heart or lung failure, and the demand for inter-facility transportation on ECLS is expanding. However, little is known about post-transportation outcomes, the clinical safety of such transportation, or the characteristics of the transported patients. Methods: This was a retrospective review of a 3-year, single-institution experience with inter-facility ECLS transport, as well as a comparative analysis of clinical outcomes with those of in-house patients. We also analyzed the risk factors for hospital mortality in the entire ECLS population using univariate and multivariate analyses to investigate the effects of transport. Results: All 44 patients were safely transported without adverse events. The average travel distance was 178.7 km, with an average travel time of 74.0 minutes. Early survival of the transported group seemed to be better than that of the in-house group, but the difference was not statistically significant (70.5% vs. 56.6%, p=0.096). The incidence of complications was similar between the 2 groups, except for critical limb ischemia, which was significantly more common in the transported group than in the in-house group (25.0% vs. 8.1%, p=0.017). After adjusting for confounders, being part of the transported group was not a predictor of early death (adjusted odds ratio, 0.689; p=0.397). Conclusion: Transportation of patients on ECLS is relatively safe, and the clinical outcomes of transported patients are comparable to those of in-house ECLS patients. Although matched studies are required, our study demonstrates that transporting patients on ECLS did not increase their risk of hospital mortality after adjustment for other factors.

• Journal of Internet Computing and Services
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• v.17 no.1
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• pp.35-45
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• 2016

Melatonin hormone involved in human's circadian rhythm adjustment sensitively responds to light's specific short wavelength ratio. A shift worker's circadian rhythm disturbance and sleep disorder are caused by the existing lighting conditions, whose short wavelength ratio is fixed. The life pattern of a shift worker changes irregularly because of irregular working hours and the same lighting environment; thus, his/her concentration is reduced. For such a reason, negative effects ensue to the detriment of healthy everyday life, including a high risk of accidents or having unsound sleep after leaving work. A smartphone-based wavelength control LED lighting system that targets shift workers and that can easily measure and control lighting suitable for wake-sleep cycle, according to working hours and closing hours, is proposed in this paper. First, after the light characteristics of LED lighting that changes depending on light control ratio are measured through the color sensor installed on the smartphone and the externally-linked Mini-Spectrometer, they are stored in the database. Based on the stored optical characteristics data, the measurement module and light control module are implemented. Lighting is offered using a control ratio having the maximum rate of short wavelength in consideration of the target illuminance, classified according to work type by identifying working hours as time when waking is required for shift workers. After a shift work leaves work, the amount of lighting is varied, using a control ratio having a minimum short wavelength rate so that a shift worker can enter the sleep state naturally.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.29 no.3
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• pp.237-247
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• 2011

As of 2011, 72 Permanent GPS Stations are installed to control DGPS reference points by the National Geographic Information Institute in South Korea. As the center of the Earth's mass continues to move, the coordinates of the permanent GPS stations become inconsistent over time. Thus, a reference frame using a set of coordinates and their velocities of a global network of stations at a specific period has been used to solve the inconsistency. However, the relative movement of the permanent GPS stations can lower the accuracy of GPS relative positioning. In this research, we first analyzed the data collected daily during the past 30 months at the 40 permanent GPS stations within South Korea and the 5 IGS permanent GPS stations around the Korean Peninsula using a global network adjustment. We then calculated the absolute and relative amount of movement of the GPS permanent stations. We also identified the optimum renewal period of the permanent GPS stations considering the accuracy of relative GPS surveying. Finally, we developed a Korean a Korean crustal movement model that can be used to improvement of accuracy.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.9
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• pp.3353-3357
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• 2010

The purpose of this study is to investigate the effect of visual rhythmic stimulation in gait ability and proprioception in chronic stroke patients. Twenty-one persons after six months post stroke participated in pre and post test control. The subjects were randomly assigned to a rhythmic visual stimulation(RVS) group (n=10) and control group (n=11). Training process was practiced with exercise on thirty minutes a day, three days a week for four weeks. To find out the effect, inspected the proprioception test and gait characteristics by gait analysis. In gait characteristics, the walking speed, cadence and the TUG time were significantly different from RVS group. The proprioception were significantly different RVS and control group. This study showed that the RVS training increased better functional activity by postural adjustment and gait learning of chronic stroke patients than that of control group. And so, the RVS training of hemiplegic patients was very important to successive rehabilitation. A continuous examination of RVS training could be practical use of physical therapy with exercise.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.21 no.5
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• pp.10-24
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• 2007

In the dissertation, a power conversion system for fuel cell is composed of a PWM inverter with LC filter in order to convert fuel cell voltage to a single phase 220[V]. In addition, new insulated DC-DC converters are proposed in order that fuel cell voltage is boosted to 380[V]. In this paper, it requires smaller components than existing converters, which makes easy control. The proposed DC-DC converter controls output power by the adjustment of phase-shift width using switch $S_5\;and\;S_6$ in the secondary switch which provides 93-97[%] efficiency in the wide range of output voltage. Fuel cell simulator is implemented to show similar output characteristics to actual fuel cell. Appropriate dead time td enables soft switching to the range where the peak value of excitation current in a high frequency transformer is in accordance with current in the primary circuit. Moreover, appropriate setting to serial inductance La reduces communication loss arisen at light-load generator and serge voltage arisen at a secondary switch and serial diode. Finally, TMS320C31 board and EPLD using PWM switching technique to act a single phase full-bridge inverter which is planed to make alternating current suitable for household

• Journal of Korean Public Health Nursing
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• v.10 no.2
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• pp.146-161
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• 1996

This study was purposed to find health promotion and care needs of the elderly in rural area of Korea. As the rural elderly are limited in accessibility to health care resources and could not immediately solve their health care needs when they need. health promotion and care services are expected to bring better and more practical solutions of their health care needs. Thus, the type of health care services to be developed in Korea rural area is discussed to have emphasis on health care service component in addition to health promoting components. Methods of this study was based on survey data analysis : total 322 persons aged older than 55 living at one 'Kun' in Korea administrative unit were interviewed by health workers working at the region and also get trained for this study data collection. The data collection interview was continued from February till May in 1996. The interview questions were modified with adjustment to Korea situation. with basis of the WHO's health promotion program components. The collected data were analyzed using SAS program for frequency, correlation, regressions. The major findings were as follows : (1) $74.8\%$ of the surveyed were sick at the survey time point. and $95.9\%$ known the diagnosis name of the disease. The most frequently complained diseases were Muscular-Skeletal diseases $(43.7\%)$. $34\%$ of those sick had never treated or discontinued therapeutic procedures. so that shown the necessity of systematic and usual health care services with health promotion program development for the elderly. (2) The percent of those who make social participation was $95.3\%$. and the activities were visiting neighbors $(70.4\%)$ and lack of qualified social activity programs. (3) $78.1\%$ of the surveyed had health counseling and education from professional health workers. Those ceased smoking and drinking were $59.6\%,\; 60.3\%$. respectively. Those had no application of therapeutic drugs or nutrion supplements was $40.7\%\;and\;94.1\%$ had regular meals. Those practiced exercises was low remarking $17.7\%$. (4) Positive health behaviors were better carried out by sick groups than by the healthier. except smoking. regular meals. and exercise. $17.5\%$ of sick group smoke more than one case of cigarettes. in contrast to $9.5\%$ of the healthier. (5) Mental health status was heathier among positive health behavior earners. Health counseling and education shown better score of mental health than those never counseled. (6) Positive health behavior practice frequency did not show significant differences when crossed by social activity participation status. (7) Health behaviors of the rural elderly people were carried out better when they had positive 'continuency in therapeutic procedure' 'health status'. 'familial relationship'. 'Health Status' of the rural olderly were explained by 'exercise'. 'drinking'. 'familial relationship'. 'activities of daily living'. Thus, health behaviors practice mutually interact with health status. In conclusion. the health promotion and care program component are recommended to include ation on the necessity of positive health promotion active social acitivities. pleasant life style, adaption into changes on the elderly, safety in residential area. community acitivity and resource utilization. etc .. in addition to the elderly's disability and sickness caring services.