• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.27 no.12
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• pp.1036-1043
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• 2016

In this paper, an analysis about the elevation angle accuracy degradation of an APAR(Airport Precision Approach Radar) due to the multi-path effect using a phased array antenna was performed. An APAR installed around a runway of airport will be continuously affected in a runway surface of the fixed environment. In this paper, an analysis about the elevation angle accuracy degradation of APAR due to the multi-path effect of runway surface was conducted through a calculation of monopluse slope and sum/difference beam pattern analysis of array antenna. Also, a difference pattern for monopulse to minimize this degradation was optimized in an appropriate configuration to improve a elevation angle accuracy. Finally, a degree of improvement of elevation angle accuracy was confirmed by calculating a monopulse slope including the ground reflection after applying optimized difference patterns of array antenna.

• The Journal of Korean Obstetrics and Gynecology
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• v.35 no.2
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• pp.16-27
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• 2022

Objectives: The purpose of this study is to analyze educational effect of ultrasound examination training with ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology. Methods: All 4^th grade students in 2021 and 2022 of school of Korean Medicine, Dong-Shin University must be trained in the department of Korean Medicine Obstetrics and Gynecology according to ultrasound examination training guideline including Objective Structured Clinical Examination (OSCE). After completing ultrasound examination training, we distributed questionnaires to them about a confidence before OSCE and after OSCE, difficulty in using ultrasound, ultrasound reading, difficulty with probe manipulation and computer operation, ultrasound understanding, clinical usefulness. And then, we analyzed the related factors including descriptive statistics, frequency analysis, student's t-test and paired t-test by SPSS 12.0. Results: Confidence in using ultrasound showed differences among students by gender and year, but it was not statistically significant. The difficulty of ultrasound use and ultrasound reading was at a moderate level, and the gender difference was not significant, and the difference between the practical students by year was statistically significant. The difficulty of the operation of the ultrasonic probe was at a normal level, and the difference between the students in practice by gender and year was not statistically significant. Although they answered that they had a very good understanding of the use of ultrasound, there was a gender difference and it was statistically significant, and practical students by year was not statistically significant. They answered that the effect on clinical use was very sufficient, but it was not statistically significant. The appropriateness of the practice time was evaluated at a moderate level. Conclusions: The use and educational effect of ultrasound examination using ultrasonic phantom in the department of Korean Medicine Obstetrics and Gynecology clinical practice education was very effective.

• The Journal of the Korea Contents Association
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• v.16 no.6
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• pp.649-661
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• 2016

It was intended to enhance the quality of festival and contribute as image of refined local festival by making an empirical and cross-sectional analysis of effect that the overall quality of service provided in the local festival had on users' satisfaction and revisit intention by using 2013-2014 two-year data for visitors who had enjoyed "Cheonan Heungtaryeong Dance Festival", best festival designated by Ministry of Culture, Sports and Tourism after 2012. The results of analyzing a difference for 2 years are as follows. 1) Among social quality factors, both cultural effect and image effect showed a significant difference with p=.001 and p=.004. 2) Among process quality factors, food and souvenir showed a significant difference with p=.27. 3) Among physical quality factors, both convenience in connection with the visitors' enjoying the festival and facility arrangement didn't show difference between groups with p=.130 and .408. Finally, in the item of whether the overall service quality of festival had an effect on visitor satisfaction and whether visitor satisfaction with festival had an effect on revisit intention, each of these had p=.000. So, it was shown that there was statistically significant difference. In other words, it is proved that the enhancement of service quality lead to high satisfaction, and this arouses revisit intention and produces word of mouth effect.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.28 no.1
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• pp.42-48
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• 2006

Open reduction and rigid internal fixation is the most popular treatment method for maxillofacial fracture patients, and it is unevitable that postoperative pain can be developed. Many surgeons including oral & maxillofacial surgeons have made constant efforts to decrease postoperative pain. This study is a comparison of postoperative analgesia and intramuscular analgesia in patients with mandibular fractures. In this study, twenty-one patients (Experimental group) were randomly selected and they were injected with IV patient-controlled analgesia (PCA; Walkmed$^{(R)}$, USA). For control group another twenty-one patients were injected with intramusclar non-steroid anti-inflammatory drugs (Rheoma$^{(R)}$, Samsung Pharm. Co.). And then, we measured visual analogue scale (VAS) scores from first postoperative day to second day at regular time interval. The following results were uptained; 1. In patient group who with open reduction and rigid internal fixation, there was significant difference of postoperative analgesic effect during the first postoperative day(p<0.05). 2. In patient group with over 90 minutes surgery time, there was significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p<0.05). 3. In patient group with less than 90 minutes surgery time, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 4. In patient group with surgery of open reduction using rigid internal fixation at single fractured site, there was no significant difference of postoperative analgesic effect during the first and second postoperative day when compared between experimental group and control group(p>0.05). 5. In patient group with surgery at two fractured sites, there was significant difference of postoperative analgesic effect during the first postoperative day when compared between experimental group and control group(p<0.05). As mentioned above, it suggest that patient-controlled analgesia is more effective for postoperative pain relief than intramuscular injection in patients with rigid internal fixation by open reduction after mandibular fracture occurred. Especially, it is considered that in patient with more than 90 minutes surgery time or in cases with multiple fractured sites had more effective results with PCA therapy than conventional intramuscular analgesics.

• 한국방재학회:학술대회논문집
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• 2007.02a
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• pp.242-245
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• 2007

Stack effects occurred in the stairwell, an important evacuation means of the high-rise building, give a big impact on stairwell pressure difference distribution and it could obstruct evacuation from the building, so should be controlled within proper range. Computer simulation was conducted with CONTAMW2.4 to find the solution of stack effects of the high-rise building. It was able to solve the imbalance pressure difference with a pressurization and a depressurization supplied by fans on higher and lower parts of the stairwell.

• Korean Journal of Applied Biomechanics
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• v.12 no.1
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• pp.193-204
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• 2002

The purpose of this study was to investigate the effect of martial art type and target height on the ground reaction force factors during Dollyuchagi motion. Data were collected using force plate. Five Taekwondo players and five Hapkido players were tested during Dollyuchagi motion to three different target heights(0.8, 1.2, 1.6 m). After analysis of kinetics using force plate data, maximum vertical ground reaction force was 1.62~2.44 BW, and impulse was $0.66\sim1.01 BW{\cdot}s$. Even though there was no difference for maximum ground reaction forces and impulse between Hapkido and Taekwondo, as target height was higher, impulse increased. Anterior-posterior and vertical ground reaction forces at kicking foot take-off were greater with target height, although there was no difference for medio-lateral force with target height. At impact there was significant difference for anterior-posterior ground reaction force between Hapkido and Taekwondo players. Taekwondo players' force (range, -0.23~-0.26 BW) was greater than Hapkido players's force (range, -0.08~-0.14 BW).

• Journal of Advanced Marine Engineering and Technology
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• v.27 no.4
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• pp.511-519
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• 2003

A stratified flow is simulated using the finite difference lattice Boltzmann method (FDLBM). The effect of body force (gravity) in a simple one-dimensional model with the lattice BGK 9 velocity is examined. The effect of body force in the compressible fluid is greatly different from that of the incompressible fluid In a compressible fluid under gravitational force, the density stratification is not sufficient and the entropy stratification is essential. The numerical simulation of a line sink compressible stratified flow in two-dimensional channel is also carried out. The results show that selective withdrawal is established when the entropy of the upper part increases. and the simulated results using FDLB method are satisfactory compared with the theoretical one.

• The Journal of Korean Physical Therapy
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• v.17 no.2
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• pp.1-10
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• 2005

This study is going to have been recognized a change of Cervical range of motion with the object 40 persons who sat for many hours before computer. According to the therapy term, sling used joint mobility exercise and Mckenzie was executed by 20 persons Shared. The study results about the effect that Cervical exercise had on joint Range of motion of a VDT syndrome patient were as follows. 1. There was a similar difference a sling used in Cervical Range of motion of joint mobility exercise cure after one-week, two-weet and three-week. 2. The change Cervical Range of motion of Mckenzie exercise has not been after one-week and two-week but a similar difference happens after three-week. 3. There has not been difference between joint mobility exercise and Mckenzie exercise in cure ferm sling used.

• Journal of Korean Physical Therapy Science
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• v.4 no.2
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• pp.367-372
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• 1997

The purpose of this paper was to evaluated a effect of aerobic exercise for obesity high school student. The subjects were 20 obesity boys and 20 obesity girls as above 25% body fat. The exercise program of this study composed to intensity of $60{\pm}10%$ HRmax, 4 day/weeks and $40{\sim}50$ min/day during twelve weeks. The results were summerized as follows : 1. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests of exercise group and HDL-cholesterol was significantly increased but no significant difference of the non exercise group in men. 2. There were significantly decreased on T-cholesterol, LDL, Triglyceride between pre and post tests but no significant difference in HDL of the exercise group in women. 3. There were no significant difference between men and women.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.657-659
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• 2001

Prototype DSLPM (Double Side Linear Pulse Motor) has a complicated magnetic circuit to be composed of permanent magnetics and winding. During the fabricating of DSLPM, we found that upper airgap length may be a little different from lower airgap length because of fabrication tolerance and error. So, a little difference of both airgap length have a various effect on the characteristics of DSLPM. Therefore, in this paper, we analyzed the normal force and maximum static thrust force according to the difference of both airgap length on DSLPM with finite element method. Obtained results can be used for design of DSLPM with higher performance.