• Industry Promotion Research
• /
• v.8 no.3
• /
• pp.137-152
• /
• 2023

As the world progresses towards a global society as time goes by, it is a natural reality that interpreting the fortunes of people born in foreign countries will inevitably increase in the future. If the time of birth is different, a big problem arises in the theory of MyungLiollgy. Therefore, this researcher decides whether to use the local standard time of the country of birth or convert it to the Korean time zone when a foreign-born person writes four weeks, because the position of the sun determines the time and date, so the local standard time It was concluded that it was appropriate to use it, and to support the discussion on the correction of true solar time in Eastern and Western countries, we carefully selected major countries and major cities where the time difference between the currently used national standard time and the true solar time according to the actual longitude line was expected, and the results were presented. was calculated and derived. As a result of the study, it was confirmed that the time difference between the national standard time and the true solar time is much greater than the general idea. On the other hand, through the case of actual foreign-born people, it was possible to find out the great influence of summer time on the composition of the sandbar, in addition to the influence of the exact time difference on the birth date and cutting time. Through the results of this study, it is thought that we have laid the systematic foundation of the myo-logical theory on the correction of true solar time in Eastern and Western countries for the simplicity of the four weeks of foreign-born people, and this will serve as an opportunity to reduce confusion about the method of simplifying the four weeks of foreign-born people. It is assumed that it will be possible.

• Geophysics and Geophysical Exploration
• /
• v.3 no.2
• /
• pp.39-47
• /
• 2000

A great deal of computing time and a large computer memory are needed to solve wave equation in a large complex subsurface layers using the finite difference method. The computing time and memory can be reduced by decreasing the number of grid points per minimum wave length. However, the decrease of grids may cause numerical dispersion and poor accuracy. In this study we performed the grid dispersion analysis for several rotated finite difference operators, which was commonly used to reduce grids per wavelength with accuracy in order to determine the solution for the acoustic wave equation in frequency domain. The rotated finite difference operators were to be extended to 81, 121 and 169 difference stars and studied whether the minimum grids could be reduced to 2 or not. To obtain accuracy (numerical errors less than $1\%$) the following was required: more than 13 grids for conventional 5 point difference stars, 9 grids for 9 difference stars, 3 grids for 25 difference stars, and 2.7 grids for 49 difference stars. After grid dispersion analysis for the new rotated finite difference operators, more than 2.5 grids for 81 difference stars, 2.3 grids for 121 difference stars and 2.1 grids for 169 difference stars were needed. However, in the 169 difference stars, there was no solution because of oscillation of the dispersion curves in the group velocity curves. This indicated that the grids couldn't be reduced to 2 in the frequency acoustic wave equation. According to grid dispersion analysis for the determination of grid points, the more rotated finite difference operators, the fewer grid points. However, the more rotated finite difference operators that are used, the more complex the difference equation terms.

• Journal of the Korean Society of Physical Medicine
• /
• v.13 no.3
• /
• pp.67-73
• /
• 2018

PURPOSE: This study was conducted to investigate the effects of pain, balance, and left / right step time difference between elastic taping and non-elastic taping in patients with acute ankle sprain. METHODS: The subjects were patients with acute ankle sprains who had been injured within 1 day. A total of 30 subjects were divided into three groups (CG: control group, EG1: experimental group 1, EG2: experimental group 2) of 10 people. The intervention period was 3 days. In the CG, only physical therapy (cryotherapy+pulsed ultrasound) was performed, while physical therapy and elastic taping were applied in EG 1 and physical therapy and non-elastic taping were applied in EG 2. RESULTS: Changes in pain, balance and left / right step time difference following intervention decreased significantly in all three groups. After intervention, the balance between the groups differed significantly between the CG and the EGs. In addition, the left / right step time difference differed significantly between the CG and EGs, as well as between the EG 1 and the EG 2. CONCLUSION: Physiotherapy is helpful for treatment of pain associated with acute ankle sprain. Taping is considered to be a way to provide more balance and gait ability.

• Economic and Environmental Geology
• /
• v.29 no.2
• /
• pp.183-192
• /
• 1996

Much computing time and large computer memory are needed to solve the wave equation in a large complex subsurface layer using finite difference method. The time and memory can be reduced by decreasing the number of grid per minimun wave length. However, decrease of grid may cause numerical dispersion and poor accuracy. In this study, we present 49 points weighted average method which save the computing time and memory and improve the accuracy. This method applies a new weighted average to the coordinate determined by transforming the coordinate of conventional 5 points finite difference stars to $0^{\circ}$ and $45^{\circ}$, 25 points finite differenc stars to $0^{\circ}$, $26.56^{\circ}$, $45^{\circ}$, $63.44^{\circ}$ and 49 finite difference stars to $0^{\circ}$, $18.43^{\circ}$, $33.69^{\circ}$, $45^{\circ}$, $56.30^{\circ}$, $71.56^{\circ}$. By this method, the grid points per minimum wave length can be reduced to 2.5, the computing time to $(2.5/13)^3$, and the required core memory to $(2.5/13)^4$ computing with the conventional method.

• Journal of Satellite, Information and Communications
• /
• v.10 no.4
• /
• pp.146-150
• /
• 2015

The COSPAS-SARSAT committee decides MEOSAR (Medium-Earth Orbit for search and rescue) service development for installing 406MHz SAR instruments on their respective MEO navigation satellite system of the United States, EU, and Russia, since 2000. The transmitted beacon signal is separately arrived by satellites with different FOA (Frequency of Arrival) and TOA (Time of Arrival). It is directly transferred to MEOLUT. In MEOLUT, a LUT track at least 3 or 4 satellites simultaneously and estimate location of beacon using time difference of arrival (TDOA) and frequency difference arrival (FDOA). But the transmitted distress signals may be overlapped each other because the distress beacons transmit signal on mean interval of 50 seconds in arbitrary time. It's difficult that simultaneously estimate location of beacon by current scheme for several overlapped distress signal. So we use cross ambiguity function (CAF) Map algorithm and present Multi-CAF MAP scheme in order to satisfy performance requirement of system. The performance is analyzed for COSAPS-SARSAT MEOSAR.

• Culinary science and hospitality research
• /
• v.7 no.1
• /
• pp.91-105
• /
• 2001

Chou-cream bread and Red bean paste bread were made by sponge & dough method with the sweet dough formula. The bread quality was studied by the measurements of the temperature variation, the fermentation level of frozen dough in the special condition(dough conditioner of 5$^{\circ}C$, 10$^{\circ}C$, 15$^{\circ}C$, 20$^{\circ}C$ and 30$^{\circ}C$), the product volume and thesensory evaluation with frozen dough thawed, fermented and baked. When thawing temperature was low, the core temperature of frozen dough increased slowly and the time for thawing and fermentationwas long. In thawing and fermentation, the core temperature of Red bean paste dough increased faster than that of Chou-cream dough. When the thawing conditions of dough conditioner(retarder) were 20$^{\circ}C$ and 30$^{\circ}C$, the level of total time decrease for thawing and fermentation was 55 and 86 min in Chou-cream dough and 62 and 90 min in Red bean paste dough respectively in comparison to dough conditioner of 5$^{\circ}C$. In volume of baked products, they showed no significant difference for three weeks of storage, but slight difference for four weeks of storage. The result was that Chou-cream bread was larger than Red bean paste bread in the decrease of volume. In sensory evaluation, the bread quality became low according to the time. When stored for four weeks in the freezer, significant differences were found in Chou-cream vread, but slight difference appeared in Red bean paste bread. The research identified that Red bean paste dough was more effective in manufacturing time than that of Chou-cream dough, when thawing temperature was high, and if frozen dough was thawed in the retarder of lower than 20$^{\circ}C$, the bread quality in terms of volume and sensory evaluation had no significant difference in comparison to the none-freezing Red bean paste bread.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
• /
• v.24 no.3
• /
• pp.108-118
• /
• 2011

Objective : This study was designed to evaluate the influence of time from onset of Bell's palsy until commenced Oriental medicine therapy on Bell's palsy. Methods : We investigated 35 cases of patients with peripheral facial palsy who visited Wonkwang University Oriental Hospital from 10th, December 2010 to 31st August, 2011 and classified them as time from onset of Bell's palsy until commenced Oriental medicine therapy. Time from onset of Bell's palsy until commenced Oriental medicine therapy of Group A was within 3 days. Group B was from 4 days to 8 days. We evaluate the treatment effect of each group by House-Brackmann grade before treatment and 1,3 week treatment. Results : 1. There was a statistical difference in period from onset of Bell's palsy until commenced Oriental medicine therapy between Group A and Group B. 2. There was a statistical difference after 1 week treatment in Group B. 3. There was a statistical difference after 3 weeks treatment in both Group A and B.3. After 3 week treatment, there was statistical significant difference in decreased value of House-Brackmann grade between Group A and Group B. Group A showed more recovery compared with Group B. Conclusions : 1. These results suggest that early oriental medicine treatment could be more effective in recovery of Bell's palsy. 2. Further studies will be required to identify the beneficial effect of early oriental medicine treatment in bell's palsy.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.34 no.4A
• /
• pp.291-301
• /
• 2009

In this paper, the effect of ISI(Inter-Symbol Interference) and ICI(Inter-Carrier Interference) due to time difference of arrival on OFDMA-based mobile multi-hop relay (MMR) systems is analyzed. Analyses are performed for the ISI caused by the previous OFDMA symbol transmitted from neighboring macro or relay cell as well as the ISI caused by the next OFDMA symbol transmitted from neighboring macro or relay cell. Then, an effective SINR(Signal to Interference plus Noise Ratio) estimation method and a path selection method considering time difference of arrival are proposed to minimize the effect of ISI and ICI. It is shown by simulation that the performance degradation caused by time difference of arrival can be significantly mitigated when the proposed path selection method is applied to the uplink of OFDMA-based MMR systems.

• The Journal of the Institute of Internet, Broadcasting and Communication
• /
• v.21 no.1
• /
• pp.27-34
• /
• 2021

In this paper, we propose a copyright protection scheme for real-time streaming of HEVC(High Efficiency Video Coding) based realistic content. Previous research uses encryption and modular operation for copyright pre-protection and copyright post-protection, which causes delays in ultra high resolution video. The proposed scheme maximizes parallelism by using thread pool based DRM(Digital Rights Management) packaging with only HEVC's CABAC(Context Adaptive Binary Arithmetic Coding) codec and GPU based high-speed bit operation(XOR), thus enabling real-time copyright protection. As a result of comparing this scheme with previous research at three resolutions, PSNR showed an average of 8 times higher performance, and the process speed showed an average of 18 times difference. In addition, as a result of comparing the robustness of the forensic mark, the filter and noise attack, which showed the largest and smallest difference, with a 27-fold difference in recompression attacks, showed an 8-fold difference.

• The Korean Journal of Food And Nutrition
• /
• v.30 no.3
• /
• pp.618-626
• /
• 2017

The purpose of this study was to investigate the intake of energy drinks and awareness of caffeine among middle school students. The subject was 313 middle school in Incheon area. The questionnaire respondents are consisted of 133 male students and 180 female students. The recognition result that allowed multiple responses to energy drink types was recognized by hot six at 28.9%, followed by red bull 24.3%, monster energy 13.8%, wolf energy 8.0% and taurine soda 6.9%, respectively. There was a significant difference in the experience of energy drink intake, intake reason, intake time and place (p<0.05), but there was no significant difference in intake frequency and place (p>0.05). There were significant differences in experience and frequency of energy drink intake (p<0.05), but there was no significant difference in intake reason, choice criteria, intake time and place (p>0.05). The result of the perception of energy drinks according to gender was 2.25 points for male students and 2.61 points for female students in the question 'caffeine is also present in tea, green tea, cola and chocolate'. There was a significant difference between male and female students (p<0.05). As a result of the recogniton of energy drinks, "the appropriate amount of caffeine is cleared and the concentration improves." When asked, "low body weight is 2.24 points, normal 2.27 points, overweight 1.89 points, obesity 2.46 points (p<0.05). There was a statistically significant difference in body mass index (BMI) between the two groups (1.95 for low body weight, 2.10 for normal body weight, 1.62 for overweight and 2.43 for obesity). Regression analysis showed that $R^2=0.007$ and F=2.798, respectively. Significant differences were found at the significance level of p<0.05. Energy drink consumption expenditure(${\beta}=0.121$, p<0.05), sleep time(${\beta}=0.130$, p<0.05), and caffeine perception(${\beta}=-0.162$, p<0.05) were significant determinants of energy drinks intake.