• Current Optics and Photonics
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• v.6 no.2
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• pp.202-211
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• 2022

In the pasteurization of escalator handrails using ultraviolet (UV) sterilizers, a combination of light distribution and escalator speed has priority over other important factors. Furthermore, since part of the escalator handrail has a curved structure, proper design is needed to improve the sterilization rate on the surfaces touched by users. In this paper, two types of sterilizers satisfying these conditions are manufactured with 275-nm UV-C LEDs, after modeling the three-dimensional (3D) structure of an escalator handrail and simulating optical distributions of UV-C irradiation on the handrail's surface according to light-emitting diode (LED) positions and reflector variations in the sterilizers. Pasteurization experiments with the UV-C LED sterilizers are conducted on six types of gram-positive and gram-negative bacteria, with exposure times of 0.2, 5, and 15 s at an actual installation distance of 20 mm. The sterilization rates for the gram-positive bacteria are 10.63% to 27.94% at 0.2 s, 89.44% to 96.30% at 5 s, and 99.64% to 99.88% at 15 s. Those for the gram-negative bacteria are 57.70% to 77.63% at 0.2 s, 98.90% to 99.49% at 5 s, and 99.88% to 99.99% at 15 s. The power consumption of the UV-C LED sterilizer is about 8 W, which can be supplied by a self-generation module instead of an external power supply.

• Korean Journal of Pharmacognosy
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• v.53 no.2
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• pp.87-95
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• 2022

Methicillin resistance Staphylococcus aureus (MRSA) is a gram-positive bacterium, the most commonly isolated bacterial human pathogen. JiYu-san is one of the natural products used to treat diseases in the folk recipe. In this study, we investigated the antimicrobial activity of EtOH 70% extracts of JiYu-san (JYS) against MRSA. The antibacterial activity of JYS against MRSA strain was evaluated using minimum inhibitory concentration (MIC), checkerboard dilution test, and time-kill assay. The effect of JYS on the immune mechanism of MRSA was confirmed through cell membrane permeability tests and energy metabolism tests, and the antibacterial activity mechanism was performed using qRT-PCR and western blot. As a result, in the antibacterial test of JYS, the MIC was measured to be 1.9~1000 ㎍/mL, and synergistic or showed a partial synergistic effect. In addition, JYS showed antibacterial activity in a combination test with DCCD or TX-100. In a study on the mechanism of action of antibacterial activity, it was found that JYS suppressed MRSA resistance genes and proteins. These results suggest that JYS has antibacterial activity and provides great potential as a natural antibiotic by modulating the immune mechanism against MRSA.

• Journal of the Korea Institute of Building Construction
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• v.22 no.4
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• pp.337-345
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• 2022

The foundation of high-rise concrete building in coastal areas generally must be installed in an integrated manner, not separately, in order to prevent defects caused by stress on the upper and lower parts of the mounting surface and to manage the process smoothly. However, when performing integrated punching, there is a concern that temperature stress cracks may occur due to hydration heat. Due to the large member size, it is difficult to make a sufficient commitment, so it is necessary to mix concrete with high self-charging properties to ensure workability. In this research, the amount of high-performance spray and admixture used was adjusted as experimental variables to satisfy this required performance. Through the analysis of the results for each blending variable, it was found that the unit quantity was 155kg/m³ and the cement ratio in the binder was 18%, and the target values of the pre-concrete properties and compressive strength were satisfied. A four-component binder(18% cement, 50% slag fine powder, 27% fly ash, 5% silica fume) was used.

• Journal of Fashion Business
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• v.27 no.1
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• pp.140-155
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• 2023

This study was undertaken to observe the influence of the model image and self-image congruence of consumers in Korean cosmetic advertisements on the advertising attitude and analyze the relationship between self-image congruence and advertising demand type, participation, and advertising effect, and to help develop plans to more effectively communicate advertising images. The experimental design of this study was 2 (self-image congruence: consistency vs. inconsistency) × 2 (advertising appeal: rational appeal vs. emotional appeal) × 2 (involvement: high vs. low) three-way ANOVA. The results of the study showed that the interrelationship between self-image congruence and advertising appeal type and involvement played an important role in determining the advertising attitude. More specifically, firstly, the self-image congruence of consumers in Korean cosmetic advertising affected the advertising attitude. Secondly, in the advertisements of Korean cosmetics, consumers preferred a rational advertising appeal to an emotional advertising appeal. Finally, statistical results showed significant differences in the influence of the interaction effect of the self-image congruence status of consumers and the advertising appeal on the attitude of advertising. The Korean cosmetic involvement of consumers had a significant impact on whether the Korean cosmetic advertising model image and consumer self-image were consistent with the type of advertising appeal and on the interaction effect of advertising attitude.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.37 no.3
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• pp.250-256
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• 1992

This study was carried out to obtain basic genetic informations in pea(Pisum sativum L.). A series of field experiments were carried out with seven pea cultivars and F$_1$ hybrids for three years. Based on the information collected from a set of diallel crosses, the behaviours of inheritance of seed yield and ten major agronomical characters were observed by the estimation of heterosis and combining ability. Heterosis for seed yield per plant was 79% and those for yield components such as number of seeds per plant, number of pods per plant, stem length, stem diameter, number of branches per plant, also showed relatively high values. General combining ability(GCA) and specific combining ability(SCA) were significantly different among major agronomic characters, and the variances of GCA were higher than those of SCA latter. Among the tested cultivars, Alderman was found to be the most promising parent based upon the GCA effects on the seed yield and yield components. The crosses of Sugar Ann$\times$Alderman, Wando$\times$Alderman and JI 1198$\times$Chinju ＃6, showed the highest SCA effects on seed yield and yield components.

• Journal of Korean Society on Water Environment
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• v.39 no.1
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• pp.20-29
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• 2023

This study analyzed the relationship between harmful cyanobacterial abundance and environmental factors in order to figure out the causes of the recent increase of cyanobacteria in Lake Dukdong from 2019 to 2021. Lake Dukdong, which is used as a drinking water source for Gyeongju City, has an algae alert system in place. Lake Dukdong has maintained good water quality, but algae alert level 1 (over 1,000 cells/mL) has been issued in recent years. As a result of Pearson correlation analysis (from May to Oct.), the cell density of Microcystis and Aphanizomenon, which form part of the most harmful cyanobacteria genus, were significantly positively correlated with the water temperature and water storage volume. T-test was performed to compare the data from 2016-2018 and 2019-2021 (from May to Oct.). The average density of harmful cyanobacteria cells increased about six-fold from 54 to 344 cells/mL. There were significant differences in water temperature, pH, total nitrogen (TN), total phosphorus (TP), TN/TP ratio, water storage volume, and cyanobacterial cell density. Water temperature increased from 19.2 to 22.8 ℃. TP concentration increased from 0.017 to 0.028 mg/L. The main cause of the recent increase of harmful cyanobacteria in Lake Dukdong is thought to be the increase in water temperature, TP concentration, and water storage volume from 2019 and 2021, resulting in more favorable conditions for cyanobacterial growth.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.348-351
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• 2009

유비쿼터스 사회를 실현하는 핵심기술인 u-GIS 공간정보 기술은 데이터 스트림 처리 시스템(Data Stream Management System)과 지리정보 시스템(Geography Information System)이 결합된 플랫폼인 u-GIS DSMS를 요구한다. u-GIS DSMS는 GeoSeonsor에서 수집되는 센서 테이터와 GIS의 공간정보 데이터를 결합하여 처리하는 공간영역질의가 다수 요구된다. 이런 공간영역질의들은 특정 지역에 밀집하게 등록되는 경향이 있으며, 유사한 프리디킷을 가질 가능성이 높다. 이러한 특징은 공간영역질의가 특정 지역에 밀집되면 다수의 비슷한 연산들이 반복적으로 처리하기 때문에 시스템 성능이 저하 될 것이다. 이를 해결하기 위해 영역질의 색인기법 연구가 활발히 진행되고 있다. 그러나 기존의 VCR-Index와 CQI-Index 기법은 질의영역을 셀 구조나 가상구조로 분할하여 처리하기 때문에 자원 및 연산을 공유 할 수 없어 질의 처리 속도가 현저히 저하되기 때문에 대량의 공간영역질의 처리에는 부적합하다. 그래서 본 논문에서는 공간영역질의의 효율적인 연산 공유를 위한 질의영역 밀집도 기반의 그룹화 기법을 제안한다. 이 기법은 질의영역의 밀집도를 이용하여 공간영역질의들을 그룹화 후 색인을 구성한다. 색인된 영역들의 데이터는 단일 큐로 구성 후 질의들의 프리디킷을 분석하여 자원 및 연산 공유기법을 통해 기존의 기법보다 처리 속도 향상 및 메모리 사용을 감소시켰다.

• 한국벤처창업학회:학술대회논문집
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• 2022.11a
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• pp.105-117
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• 2022

본 연구은 군 장병들의 자기결정성에 영향을 미치는 변인을 선정하고 회복탄력성의 매개효과를 알아보고자 한 박사학위논문의 요약본이다. 연구를 위해 전국 육군 8개 부대 장병 898명을 대상으로 자기결정성의 관련 변인을 측정하기 위한 설문을 실시하였다. 설문 결과는 통계분석을 시행하였는데, 매개효과 검증을 위해 독립변인으로 그릿과 주관적 안녕감을, 종속변인으로 자기결정성, 매개변인을 회복탄력성으로 하는 3단계 회기분석을 실시하였다. 연구 결과, 군 장병들의 일반적인 특징에서 성별과 회복탄력성 교육참여 여부는 각 변인에 유의한 차이를 보이지 않았고, 연령은 27세 이상, 계급은 부사관이 모든 변인에서 높은 수치를 보였다. 그릿과 주관적 안녕감의 하위요인들은 자기결정성에 모든 하위요인에 다소 높은 정적 상관관계와 유의한 영향을 미치는 것으로 나타났으며, 그릿과 주관적 안녕감의 하위요인들은 회복탄력성의 모든 하위요인과도 전반적으로 높은 정적 상관관계를 보였고, 전반적으로 유의한 영향을 미치는 것으로 나타났다. 회복탄력성의 하위요인들은 자기결정성의 하위요인 전반에 상관관계를 가졌으며, 부분매개효과를 확인했으나 일부요인은 기준을 충족하지 못하였다. 결론적으로 군 장병들에게 지속적인 관심과 꾸준한 노력을 기울일만한 동기부여가 무엇보다 필요하며, 군 장병들의 성공적인 자기결정력 성장을 위해서는 자율성 증진과 원활한 대인관계 환경 제공을 통한 그릿과 주관적 안녕감의 요인들의 충족이 필요함을 알 수 있었다. 또한 장병들의 회복탄력성 능력 향상을 위한 그릿과 주관적 안녕감 증진은 장병들의 자기결정성 증진에 기여할 주요 수단임을 알 수 있었고, 장병들의 주관적, 긍정적 심리상태와 자신 삶의 만족을 위한 주관적인 능력 증진을 위해서는 그릿 및 주관적 안녕감과 회복탄력성이 주요한 에너지로 활용될 수 있음을 추론할 수 있었다.

• Transactions of the Korean hydrogen and new energy society
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• v.34 no.1
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• pp.8-16
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• 2023

In this work, we report basic performance test results of a lab-scale three phase alternative current (AC) arc plasma torch system for plasma gas reforming applications. The suggested system primarily consists of three graphite electrodes inclined at 12.5° to the central axis, a 𝞥 150 mm cylindrical gas path and a three phase-60 Hz AC power supply. At air flow rate of 50 Lpm and arc currents of 100-175 A, test results revealed that plasma resistances were decreasing from 1.08 Ω to 0.53 Ω with the increase of plasma power from 9.3 kW to 13.8 kW, causing the decrease of power factor and increase of the line voltages. However, the injected air can be heated quickly up to the temperatures of >1,200℃ when injecting AC arc plasma powers of >10 kW.

• Journal of Korean Clinical Nursing Research
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• v.15 no.2
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• pp.77-89
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• 2009

Purpose: The purpose of this study was to compare maternal perceptions between two groups of postpartum women, women who chose to have their babies room-in and women who did not (non rooming-in group). Methods: Data collection was conducted in 37 hospitals from August 10 to September 20, 2008. The participants were 209 mothers opting for rooming-in and 128 mothers for non rooming-in. The women completed a questionnaire which included the Edinburgh postpartum depression scale, maternal attachment inventory, and postpartum self-evaluation questionnaire. Results: There were significant differences in education level, income and antenatal education between the rooming-in and non rooming-in groups. The rooming-in group also showed higher levels of satisfaction with medical services. More important, the rate of breast feeding for the rooming-in group was higher than for the non rooming-in group. There was no difference between the two groups for postpartum depression, maternal attachment and mothers' confidence with infant care tasks. Conclusion: These findings suggest that rooming-in system has more advantages compared to non rooming-in and that it can help to promote breast feeding. The authors recommend that the rooming-in system be expanded nationwide. The results of this research can be used to assist the development of future rooming-in system expansion strategy.