• Ocean Science Journal
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• v.43 no.1
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• pp.1-7
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• 2008

Physical and biological environmental variations in the East Sea were investigated by analysing time-series of oceanographic data and meteorological indices. From 1971 to 2000, dominant periodicity in water temperature variations had two apparent periods of 3 to 4 years and of decades, especially in the southwestern part of the East Sea affected by the influence of inflowing Tsushima warm current. Fluctuating water temperature within a certain period appears to respond to El $Ni{\tilde{n}}o$ events with a time lag. It was found that there was a strong correlation between water temperature and El $Ni{\tilde{n}}o$ events with a time lag of 1.5 and 5.5 years for periods of 3 to 6 years and of decades, respectively. Corresponding with El $Ni{\tilde{n}}o$ events, water temperature variability also showed strong correlation with shift and/or changes in biological and chemical environments of nutrient concentrations, zooplankton biomass, and fisheries. However, there also occurred a short-term periodicity of water temperature variations. Within a period of 1 to 4 years, a relatively short-term cycle of water temperature variation had strong correlation with other climate indices such as Pacific Decadal Oscillation and monsoon index. After comparing coherence and phase spectrum between water temperature and different climate indices, we found that there was a shift of coherent periods to another climate index during the years when climate regime shift was reported.

• Journal of Digital Convergence
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• v.19 no.10
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• pp.247-252
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• 2021

The purpose of this study is to understand the mediating effect of grit in the relationship between academic achievement satisfaction and academic helplessness of middle school students. To this end, a survey was conducted on 575 middle school students in Changwon, Gyeongsangnam-do, on academic achievement satisfaction, academic helplessness, and grit. This research was carried out by hierarchical regression analysis was conducted to understand the correlation analysis and mediating effect between major variables, and verified by Sobel test. As a result of the study, First, correlation analysis revealed a positive correlation between academic achievement satisfaction, grit, and academic helplessness. Second, regression analysis showed that both perseverance of effort and consistency of interest were partially mediated between academic achievement satisfaction and academic helplessness. This means that academic achievement satisfaction not only directly affects middle school students' academic helplessness, but also has an indirect effect through grit. Finally, a learning counseling plans (Self-analysis program and Environmental control program) was discussed to reduce the academic helplessness of middle school students.

• Korean Journal of Environment and Ecology
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• v.19 no.3
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• pp.287-298
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• 2005

This study was carried out to offer the raw data on conservation of land and natural environment by constructing groups of indicators to objectively and rationally assess the sustainable natural ecosystem and present the direction for establishing and planning the environmental policy. There were selected that four assessment items were biotic, abiotic, qualitative, and functional factor. And there were extracted fifty-six indicators including density, total nitrogen, hemeroby degree, and goods production. As assessment items and indicators were over 0.6, the design of questionnaire showed no great problem. In the results of correlation analysis of assessment indicators, sociality and dominance was highly correlative in biotic factor, soil property and aspect in abiotic factor, naturalized and urbanized index in qualitative factor, and protection of landslide and soil erosion were too correlative. In the results of deciding the dimension by multidimensional scaling, as stress values were from 0.042 to 0.133, index of fit over 0.9, there no statistical problems. In case of X axis, biotic factor was structure, viewpoint in abiotic factor, composition in qualitative factor, and object in functional factor, and Y axis was shaped Into form, range, structure, and activity.

• Journal of Environmental Policy
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• v.10 no.4
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• pp.61-80
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• 2011

Through concentrated investments in environmental regulations centered around BOD, which is a biodegradable matter index, and basic environmental infrastructures, national BOD pollution level has continuously improved. Nonetheless, limitations of BOD management system has become evident through nation-wide stagnation and/or increases of refractory organic matters, such as COD, at main drinking water sources, and the need for a new index, which can easily indicate different environmental conditions, has increased. Therefore, this study suggests a new organic management index for a proper management of surface water. $COD_{Cr}$ and TOC were examined as candidates for surface water quality management index, and it was found that TOC was more appropriate than $COD_{Cr}$ as an organic matter management index. Through this study, it was found that TOC possesses following qualities: a more representative index; international acceptability; monitoring program is easier; better availability of analysis techniques; better accuracy and precision of analysis; less time required for analysis; ease of operation; management of disinfection byproducts; connection with present policies; existence of foreign and domestic application case studies; and correlation with water ecosystem.

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.2
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• pp.58-64
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• 2007

As the concerns regarding global worming were increased, the pressure of greenhouse gas(GHG) emission reduction on mobile source was also increased. Carbon dioxides contribute over 90% of total GHG emission and the mobile source occupies about 20% of this $CO_2$ emission. Therefore automotive exhaust is suspected to be one of the major reasons of the rapid increase in greenhouse effect gases in ambient air. In this study, in order to investigate $CO_2$ emission characteristics from gasoline passenger cars(PC), which is the most dominant vehicle type in Korea, 106 vehicles were tested on the chassis dynamometer. $CO_2$ emissions and fuel efficiency were measured. The emission characteristics by displacement, gross vehicle weight, vehicle speed and CVS-75/vehicle speed mode were discussed. Test modes were vehicle speed modes and CVS-75 mode that have been used to develop emission factors and to regulate for light-duty vehicle in Korea. It was found that $CO_2$ emissions showed higher large displacement, heavy gross vehicle weight, low vehicle speed and CVS-75 mode than small displacement, light gross vehicle weight, high vehicle speed and vehicle speed mode, respectively. From these results, correlation between $CO_2$ emission and fuel efficiency was also determined. The results of this study will contribute to domestic greenhouse gas emissions calculation and making the national policy for climate change.

• Korean Journal of Environment and Ecology
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• v.31 no.3
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• pp.329-336
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• 2017

We analyzed the influence of living characteristics as environment related behavior by questionnaire survey analysis. Survey was conducted to 569 people living in Gimhae city, Gyongsangnam-do, Korea. By the results of correlation analysis, items with high levels of practice were related to legal regulations. However, group who are less interested in preserving the environment have lower performance in all aspects of their activities. In the relationship between social characteristics and environment related behavior, residents were generally aware of the practice of detached house dweller group rather than of apartment dweller. As the age increased, have more willing to practice. While the higher levels of education group do not make environment related behave better. However, it seemed that the student group's distinct characteristics was reflected in the education level. As this study, improvement of environmental awareness is needed to improve practice of environment related behavior rather than regal approach. Policy for environment related behavior is necessary to vary the methodology based on analysis of social characteristics, such as gender, residential type and education level rather than generalization.

• The Journal of Engineering Geology
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• v.25 no.1
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• pp.83-91
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• 2015

Few studies have investigated soil management policy and soil erosion measurement, whereas the occurrence of climate change requires the establishment of robust soil management systems and appropriate control of soil erosion. In this study, we developed a smart sensor for real-time quantitative measurements of soil erosion at the watershed scale. The smart sensor consists of an ultrasonic sensor, a rainfall meter, a solar cell, an RTU (remote terminal unit),and a CDMA (code division multiple access) and it was programmed to take a measurement every 30 minutes. The depths measured by the smart sensor were compared with data from terrestrial LiDAR. Experimental results showed a strong correlation in the depth of soil erosion between LiDAR and the ultrasonic sensor for the period from 22 August to 11 October 2013. Furthermore, the correlation coefficient between soil erosion depth (mm) and soil erosion volume (m³) was 0.9063 in the lower region of the watershed and is 0.9868 in the upper region. The proposed ultrasonic sensor technique can provide high-quality data for soil conservation and management systems in the future.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.14 no.11
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• pp.5627-5635
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• 2013

The purpose of this study was to determine factors of women's satisfaction of hospital environment following childbirth. Data were collected using a structured questionnaire from 783 women visited at 101 hospitals for delivery and frequencies, t-test, ANOVA, Pearson's correlation, and multiple regression analyses were performed. Women's satisfaction was significantly related with personal and environmental factors. Specifically, a kind of patient room, using a shared room regardless of their preference, using family delivery room, planned hospitalization, gestational week at delivery, and hospital locations significantly predicted the variance of women's satisfaction. Therefore, hospital user satisfaction should be carefully understood as a consequence of interaction of person and environment and the level of satisfaction can be represented by the degree of congruency between personal and environmental characteristics. Furthermore, healthcare providers should develop strategies to reduce gaps between personal preferences/will/control and environmental situations, contributing to women's satisfaction with hospital following childbirth.

• Journal of Korea Water Resources Association
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• v.49 no.3
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• pp.197-205
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• 2016

Recently, natural hazards have occurred frequently due to climate change. The research need for predicting variability and tendency of precipitation and temperature has been increased. However, it is difficult to determine the characteristics of precipitation and temperature within a confidence range since they change due to complex factors with choppy and too many components. If their characteristics having more than one component are decomposed, then it can be useful for determining the variation of such characteristics more accurately. In this study, Korean precipitation and temperature were decomposed and their Intrinsic Mode Function (IMF) were extracted from Empirical Mode Decomposition (EMD). Finally, the characteristics of Korean precipitation and temperature data were analyzed in terms of periodicity and tendency.

• Journal of the Korean BIBLIA Society for library and Information Science
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• v.29 no.3
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• pp.65-87
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• 2018

The user satisfaction of environmental facilities, collection, library services including webpage, etc. by using KSDC program provided by Korea Social Science Data Center has been analysed in this study. Also, the undergraduate students using P-academic library on December 2017 were sampled and analysed in this study. ANOVA etc. were used for testing wether gender, academic level and major of students affect the satisfaction, and Pearson correlation coefficient was used for testing the relation among the variables in the attached questionnaire. The major conclusions of this study are: (1) The policy development for the library use of male undergraduate students is needed. (2) The special counterplan to improve the user accessibility is needed. (3) Also, environmental facilities is absolutely needed when planning to improve user satisfaction. Besides, the development plan prepared after analysing the user opinions in essay form was suggested in this paper, too.