• 한국환경과학회지
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• 제29권6호
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• pp.623-631
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• 2020

This study analyzes the effect of negative air ions on the concentration of airborne particulate matter and evaluates the expected purification efficiency of open spaces for particulate matter by investigating the amount of negative air ions generated by plants. This study establishes a negative air ion generation treatment environment, plant environment, and control environment to measure the purification efficiency of particulate matter under the conditions of each, analyzing the expected purification efficiency by designing a particulate matter purification model. Results show that the amount of generated negative air ion according to environment was negative air ion generation treatment environment > plant environment > control environment; this order also applies to the particulate matter purification efficiency. Moreover, it took 65 min for the negative ion generation treatment environment, 90 min for the plant environment, and 240 min for the control environment to reach the standard expected purification efficiency of particulate matter concentration of 960 mg/㎥ for PM₁₀. For PM_2.5, with the designated maximum concentration of 700 mg/㎥, it took 60 min for the negative ion generation treatment environment, 80 min for the plant environment, and more than 240 min for the control environment. Based on these results, the expected purification efficiency compared to the control environment was quadrupled in the negative ion generation treatment environment and tripled in the plant environment on average.

• International Journal of Computer Science & Network Security
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• 제22권6호
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• pp.241-245
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• 2022

The main purpose of the study is to determine the main factors influencing the economic environment of the region and its financial and economic security. Ukraine aspires to become a full member of the European Union, but the events of 2022 have changed everything. Full-scale military operations on the territory of Ukraine significantly affect its socio-economic situation Today, the issue of studying the negative impact of military operations on the economic environment is very relevant. Based on the results of the study, we have identified the main negative factors of the military impact on the economic environment of the region and its financial and economic security.

• 한국환경보건학회지
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• 제45권5호
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• pp.511-519
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• 2019

Objectives: The standard method for the enumeration of environmental Legionella is culturing, which has several disadvantages, including long incubation and poor sensitivity. The purpose of this study is to demonstrate the usefulness of real-time PCR and to improve the standard method. Methods: In 200 environmental water samples, a real-time PCR and culture were conducted to detect and quantify Legionella. Using with the results of the survey, we compared the real-time PCR with the culture. Results: Each real-time PCR assay had 100% specificity and excellent sensitivity (5 GU/reaction). In the culture, 36 samples were positive and 164 samples were negative. Based on the results of the culture, real-time PCR showed a high negative predictive value of 99%, 35 samples were true positive, 105 samples were true negative, 59 samples were false positive and one sample was a false negative. Quantitative analysis of the two methods indicated a weak linear correlation ($r^2=0.29$, $r^2=0.61$, respectively). Conclusions: Although it is difficult to directly apply quantitative analysis results of real-time PCR in the enumeration of environmental Legionella, it can be used as a complementary means of culturing to rapidly screen negative samples and to improve the accuracy of diagnosis.

• 복식문화연구
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• 제29권4호
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• pp.505-521
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• 2021

This study analyzed the effects of consumer confusion on shopping fatigue and negative purchasing behaviors in an internet shopping environment. Further, the effects of shopping fatigue on negative purchasing behaviors were analyzed. The survey was conducted among consumers in their 20s and 40s in the Seoul metropolitan area who had experience of purchasing fashion products through internet shopping. A total of 392 questionnaire were analysis, with frequency, reliability, factor, correlation, and regression analysis completed using the SPSS statistics program. The results of the study showed that consumer confusion and shopping fatigue in internet shopping environment affected negative purchasing behaviors. First, consumer confusion comprised overload confusion, similarity confusion, and ambiguity confusion. It was found that overload confusion and similarity confusion significantly affected shopping fatigue. Second, shopping fatigue significantly affected negative purchasing behaviors, and an increased level of shopping fatigue result in, increased purchase delay and non-purchase behavior. Third, consumer confusion (overload confusion, similarity confusion, ambiguity confusion) significantly affected purchase delay behavior, while similarity confusion and ambiguity confusion significantly affected non-purchasing behavior. These results will provide useful data for e-CRM and marketing directions of internet companies and will contribute to rational decision-making of internet consumers and improve the quality of consumer life.

• Journal of Electrochemical Science and Technology
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• 제13권2호
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• pp.208-212
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• 2022

In this paper, we report the effects of temperature on the deterioration of graphite-based negative electrodes during the longterm cycling of lithium-ion batteries (LIBs). After cycling 75 Ah pouch-type LIB full cells at temperatures of 45℃ (45-Cell) and 25℃ (25-Cell) until their end of life, we expected to observe changes in the negative electrode according to the temperature. The thickness of the negative electrode of the cell was greater after cycling; that of the electrode of 45-Cell (144 ㎛) was greater than that of the electrode of 25-Cell (109 ㎛). Cross-sectional scanning electron microscopy analysis confirmed that by-products caused this increase in the thickness of the negative electrode. The by-products that formed on the surface of the negative electrode during cycling increased the surface resistance and decreased the electrical conductivity. Voltage profiles showed that the negative electrode of 25-Cell exhibited an 84.7% retention of the initial capacity, whereas that of 45-Cell showed only a 70.3% retention. The results of this study are expected to be relevant to future analyses of the deterioration characteristics of the negative electrode and battery deterioration mechanisms, and are also expected to provide basic data for advanced battery design.

• 아동학회지
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• 제32권3호
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• pp.77-90
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• 2011

This study attempted to examine the differences between male and female juveniles from the perspective of the parentification and to discover if the differences in the effects of shame and guilt proneness on the parentification of juveniles according to gender were observed under the control of negative family environment variables. With this purpose in mind, the researcher measured negative family environments, and the shame proneness, guilt proneness, and parentification of 225 male and 243 female students in middle schools in Seoul. The results indicate that there were differences in the levels of parentification according to gender male juveniles showed higher levels of parentification than female juveniles. In addition, after negative family environment variables were under control, both shame proneness and guilt proneness effected the parentification. Furthermore, while the effects were different according to gender, guilt proneness had a significant effect on parentification for males and shame proneness had a significant effect on the parentification for females. In conclusion, it was suggested that female's parentification as effected by shame proneness nees to be be noted although male juveniles showed higher levels of the parentification.

• 마케팅과학연구
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• 제12권
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• pp.135-154
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• 2003

본 연구는 의료서비스이용자의 편의성을 증대시키기 위하여 의료서비스접점에서 물리적 환경과 공정성, 그리고 지각된 대기시간이 매개변수인 서비스품질평가와 부정적 감정을 통하여 재이용의도에 미치는 영향을 실증적으로 조사 분석하였다. 특히 의료서비스에서 물리적환경과 공정성이 부정적 감정에 어떠한 영향이 미치는지를 처음으로 확인하고자 시도하였다. 연구결과 의료서비스접점에서 첫째, 물리적환경요인은 서비스품질평가에 긍정적인 영향을 미치고, 부정적인 감정은 낮추는 것으로 나타났다. 둘째, 공정성은 서비스품질평가나 부정적인 감정에 영향을 미치지 않는 것으로 확인되었으며, 셋째, 지각된 대기시간은 서비스품질을 낮추고 부정적 감정은 증가시키는 것으로 나타났다. 넷째, 서비스품질은 재이용의도에 긍정적 영흥를 미치고 있으나, 부정적 감정은 재이용 의도에 영향을 미치지 않고 있는 것으로 확인되었다. 따라서 의료서비스도 물리적환경의 중요성이 증가 하고, 대기시간의 단축노력이 필요하다. 또한 부정적 감정은 재이용의도에 영향을 미치지 않는 것으로 나타났으나 의료서비스의 특수성에 따른 전환장벽이 해결될 경우 이탈가능성이 존재하고 있으므로 부정적 감정의 최소화를 위한 노력이 요구된다.

• 한국생활과학회지
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• 제24권2호
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• pp.159-170
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• 2015

The aims of this study were to investigate the relationships among mothers' depression, home environment, and preschool children's development. The participants in this study were 199 parents of 3- to 5-year-old children. Statistical methods used for the data analysis were the frequencies, means, standard deviations, Pearson correlation, simple and multiple regression. The major findings were as follows. First, mothers' depression had a negative influence on home environment. Second, mothers' depression had a negative influence on children's development. Last, the effect of mothers' depression on children's development was partially mediated by home environment. The results suggest that mothers' depression and home environment may predict children's development.

• 해양환경안전학회지
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• 제12권2호
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• pp.145-150
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• 2006

본 연구에서는 인천항의 인식에 관해 퍼지이론을 이용하여 분석하였다. 분석결과 인천항만개발에 대해서 긍정적 이미지의 경우는 절충이 0.73, 찬성이 0.27로 나타났고, 부정적 이미지에서도 절충이 0.69, 반대가 0.31로 나타나 항만개발은 절충적으로 고려되어야 하는 것으로 나타났다. 항만의 이미지에 대해 연령별로 살펴보면 20대와 30대 사이에 긍정적 이미지는 급격히 낮아지는 것으로 나타났고, 부정적 이미지에서는 10대에서 20대 사이에 이미지가 높아지는 것으로 나타났다. 따라서 긍정적 이미지는 레져활동, 휴식공간의 확보 등을 통해 높이고, 종합항만공간, 친환경적 항만개발 전략 등을 통해 부정적 이미지는 낮출 수 있는 항만개발이 요구된다.

• 한국환경교육학회지:환경교육
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• 제25권2호
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• pp.161-179
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• 2012

The aims of this study are to investigate the environmental perception of elementary school students through picture drawing and associated words about environment, and analyze whether there are differences in the environmental perception according to living places and grades. The drawing of 230 students are analysed and categorized into the criteria. The results are as follows: a number of students realized as images associated with natural environment for words related to environment. In the pictures of the 'positive environment', expression frequencies of natural environment and living things were higher than ones of artificial environment and non-living things. On the other hand, there were many pictures expressed as pollutions of waste, air and water in the pictures of the 'negative environment'. Comparison of environmental perception between rural and urban students showed a significant difference all in the two criteria. There was, however, no difference in the environmental perception between grades. Therefore, it is suggested that student's minds about the sentimental situation can be studied and they can be guided in positive directions to lead their future life in environment-friendly education rather than pollution education.