• Journal of Preventive Medicine and Public Health
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• v.30 no.3 s.58
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• pp.609-622
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• 1997

Nitrogen dioxide $(NO_2)$ has been regarded as one of the main elements among air pollutants, and we measured $NO_2$ levels of near gas range, kitchen, living room and outdoor on 489 apartments in Pusan area. $NO_2$ were sampled by using Palmes tubes (diffusion tube sampler) during August 16-25, 1995 (summer) and January 15-29, 1996 (winter), respectively. Authors wanted to know comparison of $NO_2$ levels in summer and winter, $NO_2$ levels categorized by variables, and variables affected to $NO_2$ levels. According to this study, we conducted to establish the degree of indoor-outdoor air pollution of urban apartments in Korea and methods to reduce indoor air pollution. The results of this study were summarized as follows: 1) Mean $NO_2$ levels of near gas range, kitchen, living room, and outdoor were $25.9{\pm}10.0ppb,\;23.3{\pm}8.0ppb,\;19.9{\pm}6.1ppb,\;and\;19.0{\pm}6.0ppb$ in summer, and $34.5{\pm}16.8ppb,\;28.2{\pm}13.4ppb,\;25.3{\pm}12.5ppb,\;21.8{\pm}9.8ppb$ in winter, respectively. 2) Mean $NO_2$ levels according to the floor levels were not significantly different in summer, and in winter, $NO_2$ levels were decreased as the floor levels were increasing, but those were increased above 16th floor. 3) Variables showing significant correlation(p<0.05) with $NO_2$ levels were as follows; Summer: floor level, family size, number of family during a meal, number using gas range during rice cooking per day, and natural ventilation. Winter: floor level, family size, number of person who have been respiratory disease in a house, number of family during a meal, total number of meals, and number using gas range during rice or side-dish cooking per day. 4) We suggest that the methods of reducing indoor $NO_2$ levels are ventilation during cooking, complete combustion, decreasing number and time of cooking, and substitution of fuels.

• The Korean Journal of Vision Science
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• v.20 no.4
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• pp.569-577
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• 2018

Purpose : The study looked at how effective each group wearing MyoVison lens, MC lens, and Single Vision lensdepending on their parents' myopia condition. Methods : The study observed the changeof spherical equivalent among customers, who visited between January 2010 and December 2016,of an optical shop in Incheon Metropolitan City. And we observed MyoVision 152 eyes, MC Lens 86 eyes and Single Vision lens 270 eyes. This study was conducted using SPSS ver18, which analyzes the changes in average values of MyoVision, MC Lens, and Single Vision for a year.In each group, the differences in the group were compared using the Paired T-test and then one-way ANOVA (post-hoc; Bonferroni) Results : Group-to-group comparisons showed that MyoVision and MC Lens have a shorterinhibition than Single Vision. In particular, MyoVisionand MC Lens showed different relief effects depending on the degree of refraction of parents.When both parents had normal refractive, the change between MyoVision and Single Vision lens was $-0.35{\pm}0.05D$. When the father had a refraction MC lens were $-0.36{\pm}0.14D$ more effective than Single Vision. When only the mother had refraction, the mean value between MyoVision and Single Vision lens was $-0.37{\pm}0.06D$, and the mean between MC lens and Single Vision lens was $-0.38{\pm}0.08D$. And when both parents had refraction problems, the mean value change between MyoVision and Single Vision lens was $-0.28{\pm}0.07D$, and $-0.31{\pm}0.07D$, respectively. Conclusion : MyoVision and MC Lens appeared to have no effect on the functions of mitigating myopia in within group comparisons, but MyoVision and MC Lens showed reducing myopia than Single Vision in between group.

• The Korean Journal of Vision Science
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• v.20 no.4
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• pp.523-530
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• 2018

Purpose : The purpose of this study was to investigate the difference in the dynamic visual acuity between (DVA) the distance and near and the effect of change of accommodative stimulus on the dynamic visual acuity by the addition of the plus lens. Methods : The study involved 40 male and female adults ($22.84{\pm}2.43$ years old) with over 1.0 of visual acuity and without systemic disease or ocular disease. We compared the distance and near DVA and the change of DVA induced by the addition of the plus lens(+0.50D, +1.00D, +1.50D). Results : The distance DVA and near DVA are $78.86{\pm}19.46deg/sec$ and $76.90{\pm}18.05deg/sec$ respectively. The distance DVA was slightly higher(p=0.04). The higher the distance DVA, the higher the positive correlation with the near DVA and distance DVA, and distance DVA was higher in those who had higher the near DVA(r=0.95, p=0.00, Fig. 4). The near DVA according to the change of accommodative stimulus was $75.95{\pm}18.85deg/sec$ in full correction and the near DVA with +0.50D spherical power was $76.95{\pm}16.45$ but there was no statistically significant differences(p>0.05). However, the near DVA with +1.00D spherical power was $79.02{\pm}13.51deg/sec$ and it was slightly higher. Also, the near DVA with +1.50D spherical power was $84.28{\pm}18.96deg/sec$, there and it was statistically significant difference(p<0.05). Conclusion : There is no difference between distance and near DVA, but near DVA is also excellent if distance DVA is good. The DVA increases as added a plus lens for controlled accommodative stimulation changes.

• Journal of Environmental Impact Assessment
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• v.30 no.4
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• pp.225-236
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• 2021

The master plan for the Four Rivers Restoration Project (June 2009) was devised, the procedure of pre-environmental review (June 2009) and environmental impact assessment (Nov. 2009), and post-environmental impact survey were implemented, and 4 times audits also inspected. and finally the Ministry of Environment's Four Rivers Investigation and Evaluation Planning Committee proposed the dismantling or partial dismantling of the five weirs of the Geum River and Yeongsan River. But controversies and conflicts are still ongoing. Therefore, this study intend to reestablish the management plan for the four major rivers by reviewing and analyzing the process so far. The results are as follows. First, a cost-benefit analysis should be performed by comparing the water quality impact of weir operation and weir opening. Therefore, it is inevitably difficult to conduct cost-benefit analysis. Second, according to the results of cost-benefit analysis on the dismantling of the Geum River and the Yeongsan River, the dismantling of the weir and the regular sluice gate opening was decided. However, there is a problem in the validity of the decision to dismantle the weir because the cost-benefit analysis for maintaining the weir is not carried out. Third, looking at the change in water quality of 16 weirs before and after the Four Major Rivers Restoration Project, COD and Chl-a were generally deteriorated, and BOD, SS, T-N, and T-P improved. However, in the cost-benefit analysis related to water quality at the time of weir dismantling, only COD items were targeted. Therefore, the cost of BOD, SS, T-N, and T-P items improved after the project were not reflected in the cost-benefit analysis of dismantling weirs, so the water quality benefits were exaggerated. Fourth, in the case of Gongju weir and Juksan weir, most of them are movable weirs, so opening the weir alone can have the same effect as dismantling when the water quality deteriorates. Since the same effect can be expected, there is little need to dismantle the weirs. Fifth, in order to respond to frequent droughts and floods, it is desirable to secure the agricultural water supply capacity to the drought areas upstream of the four majorrivers by constructing a waterway connected to the weir. At present it is necessary to keep weirs rather than dismantling them.

• Journal of Korea Water Resources Association
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• v.53 no.12
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• pp.1071-1079
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• 2020

For integrated water management, it is essential to secure basic data such as the amount of agricultural water intake. The river water intake through the intake weir is carried out through the agricultural irrigation canal, and a method for measuring the quantity of water intake is required to suit the characteristics of the measuring points. In this study, the accuracy of the calculated flow data was determined by applying a microwave water surface current meter. The microwave water surface current meter is a method of calculating surface velocity using doppler effect, which is mainly used in high-velocities situations such as flood. Surface velocity is difficult to represent the average velocity of the entire section at low dicharges or high wind speeds, it is considered to be low in continuous utilization throughout the year, and it is necessary to verify whether the measurement using an microwave water surface curren meter is appropriate in agricultural irrigation canal. The data measured with an microwave water surface curren meter were compared with the actual flow data to calculate the intake data in agricultural irrigation canal. In agricultural irrigation canal, the low-level discharge calculated using an microwave water surface current meter at a minimum velocity of about 0.3 m/s and a minimum discharge of about 1.0 m3/s or higher was found to have a high tendency and accuracy compared to the standard discharge, especially when the high discharge was high. Although effective results can be obtained in terms of quantity at low discharge, it is deemed that subsequent studies are needed to calculate the average discharge of the cross section at low discharge, given that the trend of data is unstable. Through this study, it is suggested that it is appropriate to calculate the amount of water intake through the microwave water surface current meter in artificial waterways with a certain discharge or higher, so it is expected to be widely distributed as a method for measuring river water intake.

• Journal of the Korean earth science society
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• v.43 no.5
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• pp.591-603
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• 2022

The color and optical properties of seawater are determined by the interaction between dissolved organic and inorganic substances and plankton contained in it. The Ieodo - Ocean Research Institute (I-ORS), located in the East China Sea, is affected by the low salinity of the Yangtze River in the west and the Tsushima Warm Current in the south. Thus, it is a suitable site for analyzing the fluctuations in circulation and optical properties around the Korean Peninsula. In this study, seawater surrounding the I-ORS was classified according to its optical characteristics using the satellite remote reflectance observed with Moderate Resolution Imaging Spectroradiometer (MODIS)/Aqua and National Aeronautics and Space Administration (NASA) bio-Optical Marine Algorithm Dataset (NOMAD) from January 2016 to December 2020. Additionally, the variation characteristics of optical water types (OWTs) from different seasons were presented. A total of 59,532 satellite match-up data (d ≤ 10 km) collected from seawater surrounding the I-ORS were classified into 23 types using the spectral angle mapper. The OWTs appearing in relatively clear waters surrounding the I-ORS were observed to be greater than 50% of the total. The maximum OWTs frequency in summer and winter was opposite according to season. In particular, the OWTs corresponding to optically clear seawater were primarily present in the summer. However, the same OWTs were lower than overall 1% rate in winter. Considering the OWTs fluctuations in the East China Sea, the I-ORS is inferred to be located in the transition zone of seawater. This study contributes in understanding the optical characteristics of seawater and improving the accuracy of satellite ocean color variables.

• Journal of the Korean Society of Radiology
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• v.17 no.2
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• pp.257-265
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• 2023

The purpose of this study was to vaccinate every year according to the general characteristics of COVID-19, whether to vaccinate every year according to the vaccination experience, whether to vaccinate every year according to knowledge/attitude about vaccination, and negative responses to the vaccinate every year In order to understand the factors affecting the vaccination physician every year by identifying the factors of Statistical analysis is based on general characteristics, variables based on vaccination experience, and knowledge/attitudes related to vaccination. The doctor calculates the frequency and percentage, A square test (-test) was performed, and if the chi-square test was significant but the expected frequency was less than 5 for 25% or more, a ratio difference test was performed with Fisher's exact test. Through multiple logistic regression analysis using variables that were significant in simple analysis, a predictive model for future vaccination and the effect size of each independent variable were estimated. As statistical analysis software, SAS 9.4 (SAS Institute Inc., Cary, NC, USA) was used, and because the sample size was not large, the significance level was set at 10%, and when the p-value was less than 0.10, it was interpreted as statistically significant. In the simple logistic regression analysis, the reason why they answered that they would not be vaccinated every year was that they answered 'to prevent infection of family and hospital guests' rather than 'to prevent my infection' as the reason for the vaccination. It was 11.0 times higher and 3.67 times higher in the case of 'for the formation of collective immunity of the local community and the country'. The adverse reactions experienced after the 1st and 2nd vaccination were 8.42 times higher in those who did not experience pain at the injection site than those who did not, 4.00 times higher in those who experienced swelling or redness, and 5.69 times higher in those who experienced joint pain. There was a 5.57 times higher rate of absenteeism annually than those who did not. In addition, the more anxious they felt about vaccination, the more likely they were to not get the vaccine every year by 2.94 times.

• Journal of the Daesoon Academy of Sciences
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• v.31
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• pp.93-129
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• 2018

These days, the world finds itself in a time when 21st century human and societal practices can benefit from alternative viable models; as such models are desperately needed. Daesoon Jinrihoe seeks to show one model inspired by the historical kings, Yao and Shun. In Daesoon Jinrihoe, King Yao and King Shun (堯舜 yo sun) are recollected and projected into modern times. This paper is a study that examines what aspects of Daesoon Thought go into understanding Kings Yao and Shun and what insights their example can provide for modern people today. In Daesoon Thought, the 'Dao of Kings Yao and Shun' has appeared again because the 'Era of the Great Opening (開闢時代 gaebyeok shidae)' has arrived, and this era is characterized by 'Seeking Out the Beginning and Returning to the Original Root (原始返本 wonshi banbon).' This is not simply a return to ancient times. The seeds that fall on the ground grow up to overcome winds and rains, bring forth new fruits in the autumn, and their fruits contain the original seeds. The seeds are simultaneously the original seeds, but not the seeds themselves. Rather, they are complete bodies condensed and infused with abundant experience gained after multitudinous trials. In Daesoon Thought, Kings Yao and Shun are analyzed from the following four perspectives: first, as an ideal human image that combines the qualities of Sages and Heroes (聖雄 seong oong), second, as the historical background behind the truth of the 'Resolution of Grievances for Mutual Beneficence (解冤相生),' third, as an ancient model of the ideal world, and fourth, as Daesoon Jinrihoe's 'Mind Dharma (心法)' and also as the classical basis for the 'Cultivation of Dao (修道).' However, the meaning of Kings Yao and Shun in Daesoon Thought is not limited to traditional philosophical thought but also contains certain crucial differences. In Daesoon Thought, the qualities of sages and heroes are combined in a way that does not compromise or penalize, but in accordance with the rule of law and beyond, the ideal world is understood as a world in which there are no natural disasters and everyone enjoys beauty and splendor. Mind Dharma means the spiritual cultivation of the 'Dao of Mutual Beneficence' as presented by Sangje (上帝 the Supreme God) through sincerity, respectfulness, and faithfulness (誠敬信 seong, gyeong, shin). In addition, through the core truth of Daesoon Thought, the Resolution of Grievances for Mutual Beneficence, the resolution of the grudges associated with Kings Yao and Shun will likewise eliminate the root-grudge plaguing humanity and divine beings. In this paper, I intend to deepen my understanding of Daesoon Thought through a study on our theology's understanding of Kings Yao and Shun, and I also wish to redefine the value of Daesoon Thought through the symbolization and reinterpretation of ancient historical figures.

• Journal of the Daesoon Academy of Sciences
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• v.32
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• pp.31-76
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• 2019

Lee Sang-ho published Jeungsan Cheonsa Gongsagi (Records of the Holy Works of Celestial Master Jeungsan) in 1926. Then, after complementing the book with additional materials, he published Daesoon Jeon-gyeong in the form of a religious scripture. Since then, Daesoon Jeon-gyeong has been expanded to a sixth edition which was published in 1965. The Haengnok of Daesoon Jinrihoe's The Jeon-gyeong, which was published decades later than Daesoon Jeon-gyeong describes Sangje's whole life year by year in five chapters starting from his descent to the human world all the way to his passing into heaven. It comprehensively contains the essential contents of other chapters from The Jeon-gyeong. This paper was written for the following three goals: first, to study the contents of Haengnok that summarize Sangje's life. Second, to see how its contents are related to descriptions from the other six chapters. Lastly, to discuss how certain verses have been changed from the way they appeared Daesoon Jeon-gyeong. When we compare these two scriptures, there are some verses that are found only in the Haengnok section of The Jeon-gyeong. For example, the verse that explains how Sangje's family name 'Kang' originated and how his ancestors came to live in Gobu area is described only in The Jeon-gyeong. The origin of the family name Kang is considered important because he descended into the world as a human bearing the family name Kang, and it is included in his official name that represents his divine position. Also, unique to The Jeon-gyeong are verses such as those describing "Samsin San (the three holy mountains) in the area where Sangje descended to and verses about the historical change of place names in the areas where Sangje lived. These verses have great significance in terms of their mystical aspects within Daesoon Thought. Secondly, the record about Sangje's Holy Works at Siru Mountain in The Jeon-gyeong is not found in Daesoon Jeon-gyeong. The Holy Works at Siru Mountain are important because they provide proof of Sangje's major activities during the period between his 3-year travel around the country and his Cheonji-gongsa (Reordering Works of the Universe). Next to be observed are some changes in verses that can be seen when comparing The Jeon-gyeong to Daesoon Jeon-gyeong. Of particular impostance here are the story of Sangje's Holy Work called 'King in White Cloth and General in White Cloth' and the description of Sangje's passing into heaven. Both records contain key changes that distinguish The Jeon-gyeong from Daesoon Jeon-gyeong.

• Journal of the Korean Orthopaedic Association
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• v.54 no.6
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• pp.547-556
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• 2019

Purpose: This study evaluated the results of surgical treatment for residual or recurrent deformity after the conservative treatment of idiopathic clubfoot. Materials and Methods: Fifty-one cases (32 patients), who were followed up to skeletal maturity, were reviewed retrospectively. The mean age at the last follow-up was 18.7 years. The surgical options included selective or comprehensive soft tissue release, tendon lengthening and transfer, and various types of osteotomy. The radiology measurements included the talocalcaneal angle and talo-first metatarsal angle in the anteroposterior (AP) view, and the talocalcaneal angle and calcaneal pitch in the lateral view. The radiology measurements were compared with the normal values for adults. The clinical evaluations were made using the ankle-hindfoot score and the midfoot score of the American Orthopaedic Foot and Ankle Society (AOFAS): excellent (>85), good (71-85), pair (56-70), and poor (<56). Results: At the last follow-up, the percentages of the 51 cases, whose parameter values fell within the normal ranges were as follows: in the AP view, 41.2% (talocalcaneal angle); and 90.2% (talo-first metatarsal angle). In the lateral view, the percentage was 84.3% (talocalcaneal angle). For the calcaneal pitch, the percentages were 61%. The mean AOFAS score was 88.1±10.7 on the ankle-hindfoot score and 86.7±11.5 on the midfoot score. Conclusion: The long-term outcome of patients with idiopathic clubfoot, who underwent surgical treatment after conservative treatment, was found to be 43%-90% of the normal range of radiographic indices. Clinically, the mean AOFAS scores were "excellent". Therefore, a satisfactory result can be obtained by analyzing the elements of deformity more accurately and then using the selective operation method, even if the non-surgical correction method fails.