• Journal of Digital Convergence
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• v.15 no.2
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• pp.135-144
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• 2017

This study is to identify the growth rate and volatility of logistics related firms in the stock market. To do this, we used monthly data for 197 years from June 2000 to October 2016 by selecting KOSPI and Transport & Storage(T&S), KOSDAQ, Transportation(TRANS) index. The purpose of this study is to compare the T&S and TRANS stock index returns with the KOSPI and KOSDAQ index. And we are to judge whether the development potential of the logistics industry and the value of the investment of related companies in the future is high. For this purpose, we will analyze the basic statistics, correlation and growth rate of each index, and compare T&S and TRANS with market returns. Analysis result, for the past 197 months logistics related T&S and TRANS have been higher than market returns. The correlation was highly related to TRANS and T & S in KOSPI, but it was not related to KOSDAQ. TRANS represents high risk and high return, while KOSDAQ represents high risk and low return market. TRANS is considered to be an efficient investment. We expect the future development of logistics related industries and T & S and TRANS to show a high rate of increase compared to the market returns.

• Proceedings of the KOSOMBE Conference
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• v.1995 no.11
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• pp.147-150
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• 1995

최근의 마취과학에 관한 연구에 있어서의 주된 경향은 마취심도 및 의식수준의 결정을 신경생리학적인 관점에서 분석하고자 하는 것이다. 즉, 마취와 의식에 관한 인간의 뇌가 가지고 있는 기능이나 약리학적인 반응을 대표할 수 있는 생체신호를 검출, 분석하여 정량화하고 이들을 이용하면 마취심도 및 의식수준과의 큰 상관관계를 얻을 수 있을 것이라 가정하는 것이다. 본 연구에서는 청각유발전위 (LAEP, Long latency Auditory Evoked Potential)를 검출하여 추출된 변수들과 마취제 투여량간의 변화에 따른 상관성을 분석하고자 하였다. 수술환자(17명)를 대상으로 실험을 실시하였으며 마취제로서는 Midazolam과 Diazepam을 인체로 투여하고 1 KHz와 2 KHz의 청각자극을 제시하였을 때 피검자로부터 발생되는 LAEP를 검출하였다. 검출된 LAEP로부터 추출된 N100과 P300의 진폭은 마취량의 증가에 따라서 간소함을 알 수 있었으며, 이러한 유의한 상관성을 보이는 진폭의 변화는 마취제의 투여에 따른 의식수준의 변화를 나타내는 지수(index)의 설정 및 알고리듬의 수립에 이용될 수 있을 것이다.

• Korean Journal of Environment and Ecology
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• v.22 no.5
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• pp.544-550
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• 2008

This study conducted a survey on the ecosystem of Wonju stream from May until November in 2004 and made an health assessment of Wonju stream using family biotic indices(FBI) and physical habitat assessment(PHA) of the aquatic insects. Through this survey, aquatic insects covering 8 orders, 37 families, 62 genuses, and 92 species were observed at 9 stations along Wonju stream. In terms of family biotic indices, it was confirmed that station 1,2 and 3 were maintaining the healthiest stream ecosystem with the value ranging from 4.55 to 4.82. In addition, station 2 was found to have the best habitat environment in the correlation between physical habitat assessment and family biotic indices with its value of 100 and 4.82, respectively. However, station 7 and 9 showed the lowest habitat environment with the value of 45, 6.17 and 45, 6.97, respectively. posing the need for improvement in PHA; further, station 7 and 9 showed inverted correlationship between PHA and FBI.

• Journal of the Korea Convergence Society
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• v.11 no.6
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• pp.89-94
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• 2020

The purpose of this study was to investigate the correlation between visual analogue scale(VAS) of the waist and Oswestry Disability Index(ODI) and the muscle strength of the waist for male field hockey athletes. The VAS and ODI were conducted by self-written evaluation, and muscle strength was measured by using DAVID. Pearson correlation was used for data analysis, and the statistical significance level was set to α = .05. The VAS of the waist of male field hockey athletes and the ODI were statistically significant. However, other VAS and the ODI did not correlate to the strength of the lower back. Therefore, there is a need to develop a new exercise program for the rather than strength training during the waist rehabilitation exercise. It is thought that these studies will serve as basic data useful for the development of treatment and exercise programs for athletes in the future.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.5
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• pp.1395-1408
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• 2014

In this research, a River Recreation Index Model (RRIM) was developed to provide sufficient information on the water quality of rivers to the public in order to secure safety of publics. River Recreation Index (RRI) is an integrated water quality information for recreation activities in rivers and expressed as the point from 0 to 100. The proposed RRIM consisted of two sub models: Fecal Coliform Model (FCM) and Water Quality Index Model (WQIM). FCM predicted Fecal Coliform Grade (FCG) using a logistic regression and WQIM synthesized water quality parameters of, DO, pH, turbidity and chlorophyll a into Water Quality Index (WQI). FCG and WQI were integrated into RRI by the integrating algorithm. The proposed model was applied to upstream of Gangjeong Weir in Nakdong River, and compared with Real Time Water Quality Index (RTWQI) which is the existing water quality information system for recreation use. The results show that calculated RRI reflected change of integrated water quality parameters well. Especially chlorophyll a showed Pearson correlation coefficient -0.85 with RRI. Also, RRIM produced more conservative index than RTWQI because RRI was calculated considering uncertainty of water quality criteria. Further, RRI showed especially low values when fecal coliform was predicted as low grade.

• Management & Information Systems Review
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• v.36 no.3
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• pp.37-49
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• 2017

This study investigates the dynamic relationship between KOSPI200 stock index and stock index futures and stock index option markets which is its derived from KOSPI200 stock index. We use 5-minutes rate of return data from 2012. 06 to 2014. 12. To empirical analysis, this study use autocorrelation and cross-correlation analysis as a preliminary analysis and then following Stoll and Whaley(1990) and Chan(1992), the multiple regression is estimated to examine the lead-lag patterns between the stock index and stock index futures and option markets by Newey and West's(1987) Empirical results of our study shows as follows. First, there exist a strong autocorrelation in the KOSPI200 stock index before 10minutes but a very weak autocorrelation in the stock index futures and option markets. Second, there is a strong evidence that stock index future and option markets lead KOSPI200 stock index in the cross-correlation analysis. Third, based on the multiple regression, the stock index futures and option markets lead the stock index prior to 10-15 minutes and weak evidence that the stock index leads the future and option markets. This results show that the market efficient of KOSPI200 stock index market is improved as compared to the early stage of stock index future and option market.

• Journal of Korea Water Resources Association
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• v.56 no.12
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• pp.883-893
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• 2023

While South Korea's dependence on imported grains is very high, droughts impacts from exporting countries have been overlooked. Using the Evaporative Stress Index (ESI), this study globally analyzed frequency, extent, and long-term trends of agricultural droughts and their relation to natural oscillations and global crop prices. Results showed that global-scale correlations were found between ESI and soil moisture anomalies, and they were particularly strong in crop cultivation areas. The high correlations in crop cultivation areas imply a strong land-atmosphere coupling, which can lead to relatively large yield losses with a minor soil moisture deficits. ESI showed a clear decreasing trend in crop cultivation areas from 1991 to 2022, and this trend may continue due to global warming. The sharp increases in the grain prices in 2012 and 2022 were likely related to increased drought areas in major grain-exporting countries, and they seemed to elevate South Korea's producer price index. This study suggests the need for drought risk management for grain-exporting countries to reduce socioeconomic impacts in South Korea.

• The Korean Journal of Health Service Management
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• v.5 no.4
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• pp.137-147
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• 2011

본 연구는 일부지역 장애아동 양육자의 정신과적 문제를 알아보기 위해 우울증 지수를 검사하고 분석함으로서 그 심각성을 확인하고 장애아동 양육자의 정신보건의 필요성을 알리기 위한 기초자료를 제공하는 데 목적이 있다. 본 연구는 2011년 8월부터 9월까지 경주 및 인근지역에서 지적장애아동과 지체장애아동을 둔 전업주부의 정신과적 문제를 알아보기 위해 양육 스트레스로 인한 우울증 정도를 알아보았다. 연구대상자는 3개의 치료기관 및 치료 관련기관에서 지적장애 또는 지체장애 아동을 양육하고 있는 부모 각 20명씩을 대상으로 하였다. 우울증 평가도구는 한국형 우울증 검사(Korean Depression Scale; KDS)를 이용하였다. 결과는 첫째, 지적장애아동과 지체장애아동 양육자 모두 우울증이 있는 것으로 나타났고 각각의 차이 비교에는 유의성이 없었다. 둘째, 지적장애아동과 지체장애아동 양육자의 우울증 세부항목에서는 의욕상실 부분에서만 유의성이 있었다. 셋째, 지적장애아동 양육자의 우울증 세부항목간의 비교에서는 유의성이 있었다. 넷째, 지체장애아동 양육자의 우울증 세부항목간의 비교에서는 유의성이 있었다. 다섯째, 지적장애아동 양육자의 우울증과 세부항목의 상관관계에서는 의욕상실에서 유의한 상관성이 있었다. 여섯째, 지체장애아동 양육자의 우울증과 세부항목의 상관관계에서는 의욕상실에서 유의한 상관성이 있었다. 본 연구에서는 두 장애아동의 양육자간 차이는 없었으며 우울증은 장애유형에 상관없이 모두 나타났다. 그리고 세부항목과 우울증의 상관성에서는 의욕상실에서 유의한 상관성을 보였다. 이것은 장애아동의 양육에서 치료의 지연으로 인한 의욕상실에서 우울증이 많이 유발됨을 알 수 있다.

• Journal of the Korean Geotechnical Society
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• v.20 no.5
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• pp.17-25
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• 2004

The flat dilatometer test (DMT) is a geotechnical tool to estimate in-situ properties of various types of ground materials. The undrained shear strength is known to be the most reliable and useful parameter obtained by DMT. However, the existing relationships which were established for other local deposits depend on the regional geotechnical characteristics. In addition, the flat dilatometer test results have been interpreted using three intermediate indices - material index $(I_D)$, horizontal stress index $(K_D)$, and dilatometer modulus (E$_{D}$) and the undrained shear strength has been estimated merely using the horizontal stress index $(K_D)$. In this paper, the applicability of the flat dilatometer to Korean soft clay deposit has been investigated. Then an artificial neural network was developed to evaluate the undrained shear strength by DMT and the ANN, based on the $p_0, p_1, p_2, {\sigma '}_v$ and porewater pressure. The ANN which adopts the back-propagation algorithm was trained based on the DMT data obtained from Korean soft clay. To investigate the feasibility of ANN model, the prediction results obtained from data which were not used to train the ANN and those obtained from existing relationships were compared.

• Journal of The Korean Society of Grassland and Forage Science
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• v.43 no.2
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• pp.103-108
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• 2023

Due to the recent impact of global warming, heavy rainfall and droughts have been occurring regardless of the season, affecting the growth of Italian ryegrass (IRG), a winter forage crop. Particularly, delayed sowing due to frequent heavy rainfall or autumn droughts leads to poor growth and reduced winter survival rates. Therefore, techniques to improve yield through additional sowing in spring have been implemented. In this study, the growth of IRG sown in Spring and Autumn was compared and analyzed using vegetation indices during the months of April and May. Spectral data was collected using an Unmanned Aerial Vehicle (UAV) equipped with a hyperspectral sensor, and the following vegetation indices were utilized: Normalized Difference Vegetation Index; NDVI, Normalized Difference Red Edge Index; NDRE (I), Chlorophyll Index, Red Green Ratio Index; RGRI, Enhanced Vegetation Index; EVI and Carotenoid Reflectance Index 1; CRI1. Indices related to chlorophyll concentration exhibited similar trends. RGRI of IRG sown in autumn increased during the experimental period, while IRG sown in spring showed a decreasing trend. The results of RGRI in IRG indicated differences in optical characteristics by sowing seasons compared to the other vegetation indices. Our findings showed that the timing of sowing influences the optical growth characteristics of crops by the results of various vegetation indices presented in this study. Further research, including the development of optimal vegetation indices related to IRG growth, is necessary in the future.