• The Journal of Advanced Prosthodontics
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• 제13권3호
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• pp.160-171
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• 2021

Purpose. This in-vitro study evaluated and compared the color stability of 3D-printed and conventional heat-polymerized acrylic resins following aging, mechanical brushing, and immersion in staining medium. Materials and methods. Forty disc-shaped specimens (10 mm in diameter and 3 mm thick) were prepared from two 3D-printed [DentaBASE (DB) and Denture 3D+ (D3D)] and one conventional polymethylmethacrylate (PMMA) denture materials. The specimens were thermo-cycled, subjected to mechanical brushing, and were immersed in either coffee, lemon juice, coke, or artificial saliva (AS) to simulate one and two years of oral use. Color measurements of the specimens were recorded by a spectrophotometer at baseline (T0), and after one (T1) and two years (T2) of simulation. The color changes (ΔE) were determined and also quantified according to the National Bureau of Standards (NBS) units. Descriptive statistics, followed by factorial ANOVA and Bonferroni post-hoc test (α=.05), were applied for data analysis. Results. The independent factors, namely material, staining medium, and immersion time, and interaction among these factors significantly influenced ΔE (P<.009). Irrespective of the materials, treatments, and time, the highest and the lowest mean ΔEs were observed for PMMA in lemon juice (4.58 ± 1.30) and DB in AS (0.41 ± 0.18), respectively. Regarding the material type, PMMA demonstrated the highest mean ΔE (2.31 ± 1.37), followed by D3D (1.67 ± 0.66), and DB (0.85 ± 0.52), and the difference in ΔE between the materials were statistically significant (P<.001). All the specimens demonstrated a decreased color changes at T2 compared to T1, and this difference in mean ΔE was statistically significant (P<.001). Conclusion. The color changes of 3D-printed denture resins were low compared to conventional heat polymerized PMMA. All the tested materials, irrespective of the staining medium used, demonstrated a significant decrease in ΔE values over time.

• 한국산학기술학회논문지
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• 제22권5호
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• pp.361-370
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• 2021

본 연구는 비대면 온라인 강의와 대면강의를 경험한 간호대학생의 대학생활스트레스와 삶의 만족에 영향을 미치는 요인을 파악하고자 실시하였다. 연구대상자는 일부 지역 간호대학생을 대상으로 하였으며, 연구기간은 2020년 11월부터 12월까지이었고, 분석대상은 227명 이었다. 자료는 기술적 통계, t-tset, ANOVA, Pearson correlation과 Stepwise multiple regression으로 분석 하였다. 그 결과 삶의 만족에 영향을 미치는 요인은 대학생활스트레스, 경제상태, 대인관계가 유의한 영향을 미치며 설명력은 27.1%이었다. 일반적 특성에 따른 삶의 만족과의 관련성에서는 대학생활만족도(F=5.88, p=.003), 성적(F=7.07, p=.001), 대인관계(F=8.80, p=.000), 경제상태(F=10.53, p=.000)에서 차이가 있었으며, 삶의 만족과의 상관관계에서는 대학생활스트레스와 삶의 만족(r=-.436, p<.001)과 통계적으로 유의한 음의 상관관계로 나타났다. 결론적으로, 간호대학생의 삶의 만족을 충족시키기 위해서는 교육환경을 개선하여 학업스트레스를 줄이고, 효과적인 의사소통을 활용한 긍정적 대인관계를 유지 및 상담활동 등 적극적으로 정보를 제공해 줌으로써 경제문제를 해결할 수 있는 전략도 필요한 것으로 보인다.

• 한국엔터테인먼트산업학회논문지
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• 제14권7호
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• pp.95-106
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• 2020

이 연구는 프로배구구단의 통합적 마테팅 커뮤니케이션(IMC)활동의 효과성 입증을 위해 조사 연구되었다. 이 연구의 대상은 2019~2020시즌 남자 프로배구 경기를 관람하기 위해 경기장을 방문한 관람객을 대상으로 총 400부를 설문 조사 한 후, 무효 또는 오류 설문지를 제외한 385명의 설문지를 연구 목적으로 사용하였다. 요인 분석 및 신뢰성 테스트는 IBM SPSS통계 Ver 21.0을 사용하였다. 일반적 특성을 살펴보기 위해서 빈도분석을 실시하였다. 인구통계학적 및 일반적 특성에 따른 집단 간의 차이 검증을 위해 독립표본 t검증 및 일원분산분석을 실시하였으며, 변인간의 관계를 살펴보기 위해서 상관관계분석을 실시하였다. 이와 더불어 변인 간 영향력을 검증하기 위해 회귀분석을 실시하였다. 연구 결과는 다음과 같다. 첫째, 성별에 따른 구단이미지, 구단평판, 구단충성도에는 차이가 나타나지 않았다. 둘째, 연령에 따른 구단이미지, 구단평판, 구단충성도에는 차이가 나타나지 않았다. 셋째, 관람경험에 따른 구단이미지, 구단평판, 구단충성도에는 차이가 나타나지 않았다. 넷째, 프로배구구단 IMC활동은 구단이미지에 영향을 미치는 것으로 나타났다. 다섯째, 프로배구구단 IMC활동은 구단평판에 영향을 미치는 것으로 나타났다. 여섯째, 프로배구구단 IMC활동은 구단충성도에 영향을 미치는 것으로 나타났다. 여덟째, 구단이미지는 구단충성도에 영향을 미치는 것으로 나타났다. 마지막으로, 구단평판은 구단충성도에 영향을 미치는 것으로 나타났다.

• Journal of Korean Neurosurgical Society
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• 제65권5호
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• pp.751-757
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• 2022

Objective : Tumours of the brain are a rare occurrence accounting for approximately 2% of all neoplasms in adults. Few studies have been done in Nigeria on the profile of brain tumours. The aim of this study is to determine the profile of brain tumours in general and determine the change in Kanofsky Performance Score (KPS) after treatment. Methods : This is a prospective hospital-based study in Kaduna. All consecutive patients over 18 years of age with diagnosis of brain tumours from January 2016 to December 2019 were included in the study. Demographic and clinical data was collected using a proforma during the study. Patients who received treatment were followed up for 12 months. The primary outcome data was the difference in the quality of life as measured by KPS at the point of first contact and at 1-month after treatment and at 12-month follow up. Data obtained was analysed with SPSS version 25.0 for Windows. Descriptive statistics was done to determine the profile. Paired t-test at 95% confidence interval was done to check for significant correlation between the mean KPS. Results : A total of 39 consecutive patients were included in the study. There was a slight male preponderance with a M : F of 1.17 : 1. Meningioma and metastasis were more common in females while gliomas and pituitary tumours were more common in males. The mean age of patients was 49.8 years and standard deviation of 11.8 years. Pituitary tumours were the most common tumours. The most common location of the tumour was frontal lobe followed by the pituitary gland. The mean duration of symptoms before neurosurgical consultation was 38 weeks. The most common presenting symptoms of patient with brain tumour was headache. The quality of life improve compare to the baseline in 81% of patient at discharge and at 1 year follow up. The overall mortality rate was 25.6%. Conclusion : The most common brain tumour in our study is pituitary tumour. Most patients present late. The most common presenting symptoms is headache. There is significant improvement in the KPS of patients following treatment. The overall mortality rate at 1-year post treatment is 25.6%.

• 한국환경복원기술학회지
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• 제25권3호
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• pp.63-82
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• 2022

The purpose of this study is to compare growth condition of landscape woody plants growing on the different ground structures in apartment complex. I chose Manseok Beach Town Complex 2, in Manseok-dong, Seo-gu, Incheon which has both natural and artificial ground as a subject site. Analysis of three phases of soil showed that artificial ground had average liquid phase of 30.89%, artificial ground mounding 33.88% and natural ground 24.40%. It means that artificial ground has higher water content than natural ground despite having same earthiness. It is believed that artificial ground is not as well drained as natural ground even though it is connected to the natural ground and has a deep soil depth because of mounding. Comparative study between woody plants on natural ground and those on artificial ground demonstrated that trees on natural ground grew 40.4% compared to those on artificial ground(0.875mm more) in terms of diameter growth. Average diameter growth of trees on natural ground was 3.040mm against 2.165mm for those on artificial ground. All 19 tree species which were measured for root diameter growth showed similar or higher growth on natural ground than on artificial ground. When it comes to growth of height, arborvitae showed highest growth on natural ground, followed by Thuja occidentalis, Pinus strobus, Magnolia denudata, Diospyros kaki and Aesculus turbinata. I measured branch growth and rate of leaf adherence of Pinus strobus. Average annual rate of branch growth of woody plants on natural ground was twice as high as those on artificial ground. I could conclude that ground structure influences branch growth of Pinus strobus. Statistics analysis of tree damage demonstrated significant result, meaning that there is a difference in the average damage rate depending on structure of ground. In order to validate growth difference by planting ground, I conducted T-Test of growth of diameter, root diameter, branch and height on woody plants growing on natural and artificial ground. As a result, it is believed that there is a difference in the growth of trees depending on the ground structure. Putting all these results together demonstrates that woody plants on natural ground generally grow better than those on artificial ground, which means ground structure does have an influence on the environment of growth of trees.

• 한국환경농학회지
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• 제40권4호
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• pp.366-372
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• 2021

BACKGROUND: Ammonia is known as a precursor to fine particulate matter, and according to CAPSS, annual ammonia emissions in the agricultural sector were 249,777 tons as of 2018, accounting for about 79.0% of Korea's total ammonia emissions. In particular, ammonia emissions from agricultural land increased by 19,566 tons (10.2%) compared to the previous year. The Ministry of Environment is setting emission statistics using the ammonia emission coefficient developed in Korea in 2008, but researchers in the agricultural field regard it as a coefficient that does not reflect the reality of Korea's agricultural environment. Accordingly, in order to develop ammonia emission coefficients from the cultivation of apples and pears, Korea's representative fruit type, test agricultural land was set in Iksan, Jeollabuk-do. METHODS AND RESULTS: This study attempted to obtain the ammonia emission coefficient by the treatment of the composite fertilizer (N-P₂O₅-K₂O=12-7-9), and the flux was measured using a dynamic flow-through chamber method. As for the chamber, a total of 12 chambers were installed repeatedly in 4 zones and used to develop emission coefficients. Using compound fertilizers during fruit tree cultivation, the ammonia emission coefficient was evaluated as 10.4 kg NH3/ton for pears and 15.3 kg NH₃/ton for apples. The reason why the ammonia emission coefficient according to the use of composite fertilizers was calculated higher for apple cultivation is believed to be due to the relatively high pH concentration of apple orchard soil. CONCLUSION(S): This study may provide basic data for upgrading the ammonia emission coefficient when using composite fertilizers in agricultural land. In the future, it might be necessary to upgrade the calculation of emissions through the development of ammonia and fine particulate matter emission coefficients considering the agricultural environment of Korea.

• 한국안전학회지
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• 제37권1호
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• pp.64-69
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• 2022

The study measured a subway construction worker's Macpa stress by Heart Rate Variability measuring instrument and conducted a survey of Korean job stress from subway construction workers. Also, the study analyzed the relationship between Macpa stress index and Korean job stress result and suggested managing stress method for each item. According to National Statistical Office data, the first line subway in Seoul was started to open in 1974. The extended total length is 996 kilometers until 2019. Many aged workers are currently working at subway construction sites due to the avoidance of young workers since the past until now. It means that the elderly has a substantial portion among subway construction workers. The productivity has been adversely affected by health problems due to the aging of workers, job stress due to heavy work, and personal health problems. So, the regulation and policies on job stress health management are being strengthened. The data were measured Macpa stress by machine measuring heart rate variability and conducted Korean job stress survey(shortened) from Sa-sang to Ha-dan line Busan subway construction workers for analyzing the relationship. Independent variable were age, job duration, job position, employment type, working type in this study. Macpa's dependent variable was stress index and Korean job stress survey(shortened)'s dependent variables were job requirements, job autonomy, relationship conflict, job instability, organizational structure, inappropriate compensation, working place culture, and total score. SPSS 12.0 K Statistics Program was used for statistical analysis. Kruskal-wallis test, a nonparametric statistical analysis, was used because the data are difficult to be assumed as normal distribution. As a result, the paper indicated the significant correlation between Macpa stress index and Korean job stress(short version). The elderly workers presented higher Macpa index and higher job stress due to aging and heavy-duty work. The majority workers were daily workers who had unstable working condition and uncertainty about the future. The study suggested a manual that could reduce job stress for subway construction workers and future study deriving management tool through analyzing job stress factor is necessary.

• 디지털융복합연구
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• 제20권5호
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• pp.1-10
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• 2022

본 연구는 교육에서의 ICT 활용의 중요성이 커짐에 따라 에듀테크 활용에 대한 교육현장과 산업체의 인식의 차이 및 특징을 분석하고, 요구사항을 도출함으로써 에듀테크 활성화를 위한 정책적 제언을 제시하고자 한다. 이에, 교사 201명과 100개 기업체를 대상으로 설문조사를 실시하여, 에듀테크 활용에 대한 필요도와 활용도를 알아보기 위한 IPA 분석과 Borich 요구도, 기초통계, t검증을 실시하였다. 그 결과, 에듀테크 활용의 필요도에 대해 높게 인식하고 있었으며, 에듀테크를 위한 지원이나 접근성이 부족한 것으로 인식하고 있었다. 이에, 제품 개발단계부터 활용, 사후관리에 이르기까지 현장 교사와 기업의 직접적인 교류, 에듀테크 도입을 위한 전문적 지원, 구매 프로세스 간소화 및 관련 규제 완화, 교사 특성에 따른 맞춤형 지원 및 연수 프로그램이 요구된다. 향후, 코로나-19 이후에 나타날 교육 변화를 고찰하여 알맞은 제품 개발과 활용 확산 전략이 수립되어야 할 것이다.

• Journal of Animal Science and Technology
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• 제64권3호
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• pp.471-480
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• 2022

This experiment was conducted to determine the maximum dietary energy levels on growth performance and carcass characteristics of White Pekin duck. the Six dietary treatments were formulated based on their apparent metabolizable energy (AME) concentrations from 2,700 to 3,200 kcal/kg with a 100 kcal/kg gap to evaluate the accurate dietary AME requirement to address current knowledge and further issues for fulfilling the genetic potential of meat-type white Pekin ducklings. A total of 432 one-day-old male White Pekin ducklings were randomly allocated into one of six dietary treatments with six replicates (12 birds per pen). The diets were formulated as corn-soybean meal-based diets to meet or exceed the Nutrient Requirement of Poultry specification for meat-type ducks. Growth performance indices (i.e. average daily gain [ADG], average daily feed intake, feed conversion ratio) were measured weekly. Medium body weight (BW) ducklings from each pen were sacrificed to analyze the carcass traits and abdominal fat content on day 21. Obtained data were analyzed to estimate significant effect using the one-way ANOVA of IBM SPSS Statistics (Version, 25). If the p-value of the results were significant, differences in means among treatments were separated by Tukey's post hoc test. Significant differences were then analyzed with a linear and quadratic broken model to estimate the accurate concentration of AME. Ducklings fed higher dietary AME diets increased (p < 0.05) BW, ADG. Ducklings fed higher AME than 2,900 kcal/kg diets increased abdominal fat accumulation and leg meat portion. The estimated requirement by linear plateau method showed from 3,000.00 kcal/kg to 3,173.03 kcal/kg whereas the requirement by quadratic plateau method indicated from 3,100.00 kcal/kg to 3,306.26 kcal/kg. Collectively, estimated dietary requirements exhibit diverse results based on the measured traits and analysis methods. All the estimated requirements in this experiment present higher than previous research, the maximum requirement for the next diet formulation should be selected by the purpose of the diet.

• 대한통합의학회지
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• 제11권3호
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• pp.99-114
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• 2023

Purpose : The purpose of this study was to determine factors that affect the quality of life (QoL) of people with diabetes. We hope to provide a basis for intervention strategies for health promotion and related research among patients with diabetes in the field of physical therapy. Methods : We selected individuals diagnosed with diabetes who were aged 19 years or higher by using data from the 2019 Korean Health Panel survey and analyzed the results of 1,527 people. The influencing factors were sex, age, household income, marital status, age, education level, subjective health status, body mass index (BMI), smoking, drinking, regular exercise, experience of depression and anxiety, suicidal thoughts, stress, and frequency of walking (days/week). Frequency analysis, descriptive statistics, independent sample t-test, one-way analysis of variance, and multiple regression analysis were performed. Results : The EQ-5D score for QoL was .87 ± .12, with pain and discomfort being the most detrimental to the QoL of people with diabetes. In terms of patients characteristics, the QoL was lower among participants who were female, older, and separated/widowed/divorced; had an education level below middle school; had a poor subjective health status; were non-smokers and drinkers; and did not walk and exercise regularly, experienced a lot of stress, and experienced depression and anxiety; and had suicidal thoughts (p<.001). Being separated/bereaved/divorced; experiencing a lot of stress, depression, and anxiety; and having suicidal thoughts were negatively associated with QoL in people with diabetes (p<.01). On the other hand, age of 65 years or younger; graduation from high school, fair or better subjective health, regular exercise and alcohol consumption, and walking (days/week) were positively associated with QoL (p<.05). Conclusion : Regarding the QoL of patients with diabetes, intervention strategies should be formulated by considering general characteristics and disease-related characteristics. Among the various factors affecting QoL, the number of walking and regular exercise were found to be the factors that improved the QoL of patients with diabetes. These results can be used as a basis for the education and management of patients with diabetes in the field of physical therapy.