• The Transactions of the Korean Institute of Electrical Engineers D
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• v.54 no.7
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• pp.443-446
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• 2005

In this paper, we analyses transmission performance of communication security(COMSEC) bit synchronization information over the single channel ground and airborne radion system in variable message format system. Experimental results demonstrate the robust characteristics of the COMSEC bit synchronization information in 10-1 $\~$ 10-5 of bit error channel and the relationship of time duration of bit synchronization and probability of synchronization detection.

• Journal of Korean Academy of Nursing Administration
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• v.1 no.1
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• pp.46-64
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• 1995

The 12-hour work shift can be influenced on the nurse's job satisfaction, effective personnel administration, and quality of patient care. The purpose of this study was to explore the perception on the 12-hour work shift by nurses. A total of 516 nurses were selected by convenience sampling from six general hospitals in Seoul. Based on the literature review, the questionnaire on the need of the 12-hour work shift was designed by the investigator. The data were analyzed using descriptive statistics, ANOVA and Duncan's method as post-hoc test. The results of this study are as follows ; 1. The need of 12-hour work shift The mean needs of 12-hour work shift in the nursing practice, psychological, physical, socioeconomic, and environmental perspectives were 3.05, 2.72, 2.66, 3.08, and 4.22. 2. The need of 12-hour work shift by demographic data For the nursing practice, there was a statistically significant relationship between marital status(p=.021), satisfaction on the 8-hour work shift(p=.038), the perception on the 12-hour work shift(p=.001) and the need of 12-hour work shift. For the psychological perspectives, there was a statistically significant relationship between marital status(p=.016), the perception on the 12-hour work shift(p=.0001), and the need of 12-hour work shift. For the physical perspectives, there was a statistically significant relationship between age(p=.002), marital status(p=.005), the number of children(p=.005), the duration of job career(p=.014), the job position(p=.002), the work shift(p=.030), the perception on the 12-hour work shift(p=.0001) and the need of 12-hour work shift. For the socioeconomic perspectives, there was a statistically significant relationship between the job position(0=.002), the work shift(p=.006), the perception of the 12-hour work shift(p=.002) and the need of 12-hour work shift. For the environmental perspectives, there was a statisitically significant relationship between the traffic method(p=.05), the duration of the job career(p=.026), the perception on the 12-hour work shift(p=.309) and the need of 12-hour work shift. 3. The need of 12-hour work shift by the demographic data There was a statistically significant difference between marital status(p=.014), the number of children(p=.038), the job position(p=.007), the work shift(p=.037), and the perception on the 12-hour work shift(p=.0001) for the need of 12-hour work shift.

• Journal of Korean Home Economics Education Association
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• v.30 no.4
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• pp.1-14
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• 2018

The purpose of this study was to examine the relevance of mental health and nutritional intake according to the sleep duration of Korean adolescents. This study was based on data from the 2007-2016 Korea National Health and Nutrition Examination Survey(KNHNES), including 5,489 total subjects (2,795 middle school students, 2,694 high school students). The association between sleep duration and mental health was analyzed using a logistic regression analysis, and the link between sleep duration and nutritional intake was analyzed via a generalized linear model. An analysis of sleep duration showed that middle school students had a higher average sleep duration than high school students (P<0.0001). An analysis of the relationship between sleep duration and mental health showed that middle school students had lower rates of stress perception (P<0.0001) and suicidal ideation (P=0.0005) as their sleep duration increased. High school students had 53% less suicidal ideation in the group getting 6-7 hours compared to the group getting less than 6 hours, and 37% less suicidal ideation than the group getting 7-8 hours. The link between sleep duration and stress perception was statistically significant among both middle and high school students (P for interaction=0.02). An analysis of the daily intake of major nutrients according to sleep hours found high intake of vitamin C in groups where high school students slept more than nine hours (P=0.003). The state of nutritional intake according to higher sleep duration showed statistically significant differences between higher intake of phosphorus, riboflavin, niacin, and vitamin C in Nutrient Adequacy Ratio for high school students. In conclusion, adolescents' sleep duration is associated with stress perception, suicidal ideation and nutritional intake. Therefore, this study emphasizes the mental importance of adolescent sleep and can be used as a basis for nutrition education.

• Journal of Veterinary Clinics
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• v.13 no.2
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• pp.163-170
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• 1996

This study was performed to analyse the common calls of poddle spectrographically : bark, growl, howl, snore, yelp and whine. The sonograms of 6 common calls were shown their own specific features. There were significant differences among each types of common callsin the parceter of minimun frequency of call (MIFC), maximun frequency of call (MAFC), duration of call (DC), interval between call (IBC), dominant frequency (DF), F1 formant, F2 formant and F3 formant (P<0.01). It was considered that it was possible to record the main common calls dogs by sonograms and it sould be applied to objective basic data for understanding the psychological stats of dogs, the social relationship among them and the relationship sith human being.

• Journal of Chest Surgery
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• v.19 no.2
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• pp.181-187
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• 1986

The changes of serum creatine phosphokinase [CPK], serum lactic dehydrogenase [LDH], serum glutamic oxaloacetic transaminase [GOT] and serum glutamic pyruvic transaminase [GPT] were studied in a total of 82 cases who underwent open heart operation under the cardiopulmonary bypass at the Department of Thoracic and Cardiovascular Surgery, Chungnam National University Hospital. The results were as follows 1. The average values of CPK and COT after the operation were reached to the maximal values on the first postoperative day, which were returned to the normal range until the fifth postoperative day. The average values of LDH and CPT after the operation were reached to the maximal values on the first and second postoperative day respectively, which were significantly increased until the seventh postoperative day. 2. In the relationship of the serum enzymes and duration of the extracorporeal circulation, the values on the group over 90 minute of the extracorporeal circulation were more increased than on the group below 90 minute of the extracorporeal circulation. 3. In the relationship of the changes of the serum enzymes and congenital heart diseases and acquired heart diseases, there were no significantly differences in the values between the two groups.

• Journal of Korean Academy of Nursing
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• v.5 no.1
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• pp.87-92
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• 1975

This study was performed from July to December 1974 to investigate the rates of contamination of distilled water for injection and local anesthetics. 222 vials were sampled from 7 different places of St. Mary's Hospital The samples were cultured for isolation of microorganisms. The results were as follows; 1. Of 222 vials, 11 were Contaminated by 6 types: Staphylococcus epidermis, Bacillus subtilis, Mima polymorph a, Alcaligenes faecalis, Herellea vaginicala and pepto- streptococcus. 2. 5(9.1 %) of 55 vials from surgical wards, 2 (4.2 %) of 48 vials from surgical OPD, and 4 (12,l %) of 33 vials from pediatric wards were contaminated 3. Between rates of contamination of distilled water for injection and local anesthetics and the number of punctures, there was no significant relationship. (CR=1.42 P〉0.1) 4. There was no significant relationship (CR=1.02 P〉0.1) between the rates of contamination of vials and the duration of the first and the last punctures. 5. The ratios of contamination between 75% alcohol and 2% phenol used for disinfection of rubber lids of vials did not show significant difference.

• Wind and Structures
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• v.4 no.2
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• pp.147-162
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• 2001

This paper presents an analytical method which takes into account the non-linearity of individual members, and discusses some case study results. It also discusses the relationship between member non-elastic behavior and excitation duration, and the relationship between member fracture and overall structure behavior. It is clearly demonstrated that the frame already shows almost unstable behavior due to long-columnization just before the occurrence of a column fracture. Then, a column fracture immediately induces a structural collapse mechanism.

• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.464-467
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• 1999

Usually, more reference signatures result in better performance in signature verification. However, registering .many signatures may be a tedious work for users, so algorithms that use less signatures for the registration without increasing error rate is needed. In this paper, we find the features such as pen-down duration, the number of locally minimum velocity points, and the number of locally maximum curvature points. Then we find the relationship between these features and the optimal decision boundary. We apply this relationship in deciding threshold for signature verification. Experimental results show that the method using three reference signatures has almost same error rate as algorithms with many references.

• Journal of the Korean Society of Safety
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• v.10 no.4
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• pp.103-108
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• 1995

This study was performed to investigate a relationship between a biomechanical analysis of compressive force at L5/S1 and electromyographic analysis of erector spinae muscle during lifting task. In the experiment, isometric contractions at 25, 50, 75, 100%MVC for short duration and sustained isometric contractions at 50%MVC were performed. For muscle recruitment patten and compressive force analysis, rectified EMG amplitudes analysis and computerized biomechanical analysis were used. To achieve data, angles of neck, shoulder, elbow, wrist, hip, knee, ankle and length of body segments were measured. Results shows that trends of initial EMG rectified amplitude were similar to those of biomechanical calculation value and for sustained isometric contraction at 50%MVC EMG rectified amplitude of erector spinae muscle after 40seconds was increased up to level of 75%MVC. Based on the results of this study, biomechanical analysis should be supplemented considering muscle fatigue, and it is also suggested that work-rest cycle critera and the evaluation of back-pain injuries should include muscle fatigue.

• Korean Journal of Construction Engineering and Management
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• v.10 no.3
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• pp.130-138
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• 2009

Bromilow's time-cost (BTC) relationship was examined for building projects in Vietnam using actual construction time and total construction cost. Data set was collected from 77 historical building construction projects completed between 1999 and 2005 which were adjusted by consumer price index (CPI) to 2000 price. Time-cost equations were specified respected to two sectors, public and private, in Vietnamese construction industry and all cases. It is shown that a public funded building project has the longer construction duration than a similar budget private funded project. The resulting models are statistically significant. The adjusted R-square coefficients of all cases, public and private projects models are respectively 0.403, 0.436 and 0.377 mean that the BTC regression lines moderately fit the data set.