• 한국환경생태학회지
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• 제33권3호
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• pp.292-302
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• 2019

본 연구는 태백산국립공원 백두대간 생태축 연결을 위한 평가항목 및 요인별 가중치 설정을 위해 공원관리와 생태계조사, 생태환경계획과 관련된 분야별 전문가 대상의 설문조사를 토대로 계층화 분석을 실시하였다. 문헌연구와 담당자 면담조사로 생태축 연결을 위한 상위 평가지표 4개와 하위 평가지표 13개를 선정하였으며, 일관성 분석에 의한 유효설문을 대상으로 항목별 가중치를 산정하였다. 분석결과, 상위평가 지표에서는 생태계 가치증진이 0.474로 가장 높고, 자연-인간 갈등완화(0.247), 지역주민의 참여(0.165), 경제적 측면(0.114) 순으로 나타났으며, 하위 평가지표에서는 생물이동경로(0.116), 경관생태적 패치 연결성(0.112), 기능적 서식지(0.099) 등이 중요 항목으로 추출되었다. 분야별 평가항목과 가중치 비교에 따르면 생태계조사 분야에서는 생물종 이동경로(0.116)을 가장 중시하는 반면, 공원관리 분야에서는 기능적 서식지가 0.110로 가장 중요한 항목으로 평가되었으며, 생태환경계획 분야에서는 지역의 보전 및 이용자원 분포현황이 0.123으로 가장 높게 나타났다. 본 연구결과는 태백산국립공원 일대의 생태축 연결에 필요한 조사항목의 선정이나 분야별 연결성 분석방향 설정에 기여할 것이다.

• 한국측량학회지
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• 제32권4_1호
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• pp.343-351
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• 2014

본 연구에서는 최근 들어 그 중요성이 부각되고 있는 도시공간의 보행환경 평가와 관련하여 지역의 보행친화도와 물리적 사회경제적 특성과의 상관관계를 공간통계학적 측면에서 분석 하였다. 이를 위해 부산광역시의 2개 구의 보행성 지수(Walkability Index)를 정량적으로 산출하였고 이에 대한 전역적 국지적 공간 자기상관 측정을 수행하였다. 또한 Walkability Index에 대해 도시환경 변수와의 상관성을 파악하기 위해 지리가중 회귀분석(GWR : Geographically Weighted Regression, 이하 GWR)을 수행하였다. 연구결과 연구지역의 Walkability Index에서 통계적으로 유의한 수준의 공간 자기상관 수치와 군집이 도출되었다. 또한 GWR 분석결과 OLS(Ordinary Least Square Regression, 이하OLS) 회귀모형보다 통계적으로 개선된 추론이 가능 하였으며, 보행 환경변수에 대한 국지적 수준의 영향관계를 도출할 수 있었다. 본 연구의 결과들은 지역의 보행환경 평가 및 그와 연관된 환경변수의 탐색 시 공간 통계학적 접근이 효과적일 수 있음을 시사한다.

• Animal Bioscience
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• 제37권7호
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• pp.1196-1203
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• 2024

Objective: A study was conducted to quantify the performance differences of the near-infrared spectroscopy (NIRS) calibration models developed with different degrees of hay sample preparations. Methods: A total of 227 imported alfalfa (Medicago sativa L.) and another 360 imported timothy (Phleum pratense L.) hay samples were used to develop calibration models for nutrient value parameters such as moisture, neutral detergent fiber, acid detergent fiber, crude protein, and in vitro dry matter digestibility. Spectral data of hay samples prepared by milling into 1-mm particle size or unground were separately regressed against the wet chemistry results of the abovementioned parameters. Results: The performance of the developed NIRS calibration models was evaluated based on R², standard error, and ratio percentage deviation (RPD). The models developed with ground hay were more robust and accurate than those with unground hay based on calibration model performance indexes such as R² (coefficient of determination), standard error, and RPD. Although the R² of calibration models was mainly greater than 0.90 across the feed value indexes, the R² of cross-validations was much lower. The R² of cross-validation varies depending on feed value indexes, which ranged from 0.61 to 0.81 in alfalfa, and from 0.62 to 0.95 in timothy. Estimation of feed values in imported hay can be achievable by the calibrated NIRS. However, the NIRS calibration models must be improved by including a broader range of imported hay samples in the modeling. Conclusion: Although the analysis accuracy of NIRS was substantially higher when calibration models were developed with ground samples, less sample preparation will be more advantageous for achieving rapid delivery of hay sample analysis results. Therefore, further research warrants investigating the level of sample preparations compromising analysis accuracy by NIRS.

• Toxicological Research
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• 제28권3호
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• pp.173-178
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• 2012

This study investigated the human health risks of trichloroethylene from Industrial Complex A. The excessive carcinogenic risks for central tendency exposure were $1.40{\times}10^{-5}$ for male and female residents in the vicinity of Industrial Complex A. The excessive cancers risk for reasonable maximum exposure were $2.88{\times}10^{-5}$ and $1.97{\times}10^{-5}$ for males and females, respectively. These values indicate that there are potential cancer risks for exposure to these concentrations. The hazard index for central tendency exposure to trichloroethylene was 1.71 for male and female residents. The hazard indexes for reasonable maximum exposure were 3.27 and 2.41 for males and females, respectively. These values were over one, which is equivalent to the threshold value. This result showed that adverse cancer and non-cancer health effects may occur and that some risk management of trichloroethylene from Industrial Complex A was needed.

• 한국환경과학회지
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• 제24권8호
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• pp.1023-1036
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• 2015

A reliable streamflow forecasting is essential for flood disaster prevention, reservoir operation, water supply and water resources management. This study proposes a hybrid model for river stage forecasting and investigates its accuracy. The proposed model is the wavelet packet-based artificial neural network(WPANN). Wavelet packet transform(WPT) module in WPANN model is employed to decompose an input time series into approximation and detail components. The decomposed time series are then used as inputs of artificial neural network(ANN) module in WPANN model. Based on model performance indexes, WPANN models are found to produce better efficiency than ANN model. WPANN-sym10 model yields the best performance among all other models. It is found that WPT improves the accuracy of ANN model. The results obtained from this study indicate that the conjunction of WPT and ANN can improve the efficiency of ANN model and can be a potential tool for forecasting river stage more accurately.

• 대한지역사회영양학회지
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• 제5권2호
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• pp.141-151
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• 2000

The purpose of this study was to compare food habits and nutrient intakes among high school students with different obesity indexes who are residing in Seoul and Kyunggi-do. a total of 533 subjects were assigned to one of the following groups based on BMI : underweight, normal-weight and overweight. Food habits and nutrient intakes were evaluated based on questionnaires and 24hr-dietary record. The results were as follows. There was no significant differences in the general environmental characteristics of subjects with different BMI. However, the father\`s BMI was significantly higher in overweight female students compared to underweight or normal weight subjects. The menarch age was significantly decreased as the obesity increased. The self-satisfaction score for physical type was decreased as the BMI increased. The overweight group skipped dinner more frequently the other groups among male students. There was no significant difference in the scores of nutrition knowledge, nutritional attitude, and self -satisfaction of subjects with different BMI. The nutrient intakes of overweight group were the lowest among the three groups. In conclusion, obesity among female students may be related to family member\`s obesity. Also overweight students tend to have lower self satisfaction for their body image and undesirable food habits. Therefore, proper nutrition education is required to maintain desirable food habits for overweight students.

• Asian-Australasian Journal of Animal Sciences
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• 제32권9호
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• pp.1332-1339
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• 2019

Heat stress exerts a substantial effect on dairy production. The temperature and humidity index (THI) is widely used to assess heat stress in dairy operations. Herein, we review the effects of high temperature and humidity on body temperature, feed intake, milk production, follicle development, estrous behavior, and pregnancy in dairy cows. Analyses of the effects of THI on dairy production have shown that body temperature is an important physiological parameter in the evaluation of the health state of dairy cows. Although THI is an important environmental index and can help to infer the degree of heat stress, it does not reflect the physiological changes experienced by dairy cows undergoing heat stress. However, the simultaneous measurement of THI and physiological indexes (e.g., body temperature) would be very useful for improving dairy production. The successful development of automatic detection techniques makes it possible to combine THI with other physiological indexes (i.e., body temperature and activity), which could help us to comprehensively evaluate heat stress in dairy cows and provide important technical support to effectively prevent heat stress.

• Geomechanics and Engineering
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• 제25권4호
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• pp.317-330
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• 2021

This paper reports the results of advanced data analysis involving artificial neural networks for the prediction of the unconfined compressive strength of granite using only two non-destructive test indexes. A data-independent site-independent unbiased database comprising 182 datasets from non-destructive tests reported in the literature was compiled and used to train and develop artificial neural networks for the prediction of the unconfined compressive strength of granite. The results show that the optimum artificial network developed in this research predicts the unconfined compressive strength of weak to very strong granites (20.3-198.15 MPa) with less than ±20% deviation from the experimental data for 70% of the specimen and significantly outperforms a number of available models available in the literature. The results also raise interesting questions with regards to the suitability of the Pearson correlation coefficient in assessing the prediction accuracy of models.

• 한국정보전자통신기술학회논문지
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• 제16권5호
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• pp.301-306
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• 2023

Attention is a fundamental aspect in the cognitive process of human. Cognitive system of human body requires to focus on selected information among a vast amount of information from sensory organs. It has widely studied that various environmental factors affected the level of attention; however, few researches have aimed to the effect of direct cryotherapy. In this research, level of attention was studied comparing sub-indexes of FAIR test between groups with different duration of direct cryotheapy to the back of neck. FAIR test is a evaluation tool for visual attention consisting of three sub-indexes. Selective attention, accuracy of attention, and persistence of attention can be independently analyzed by FAIR test. In the analysis of selective attention, cryotherapy for 5 to 20 minutes showed higher result than cryotherapy for 40 minutes. In the analysis of persistence of attention, cryotherapy for 5 to 15 minutes showed higher result than cryotherapy for 40 minutes. Overall, selective attention and persistence of attention turns out to be maximized between 5 to 20 minutes of cryotherapy and tends to decrease afterwards. However, accuracy of attention does not seem to be affected by the duration of cryotherapy. Correlation between selective attention and the skin temperature by cryotherapy tends to be negative supporting the findings by ANOVA and post-hoc test. Correlation between persistence of attention and the skin temperature showed similar results.

• 한국수자원학회논문집
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• 제42권6호
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• pp.481-491
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• 2009

금강수계중 용담댐하류 앞섬 지점에서 생태유량을 산정하기 위한 생태 모니터링을 실시하여 어류종별 서식환경 특성조사를 포괄적으로 실시하였다. 이를 바탕으로 어류상, 상대풍부도 및 생물다양도 분석 등을 포함한 하천의 건강성 평가를 실시하고, 쉬리, 피라미 및 감돌고기 등에 대하여 작성한 서식처적합도 지수(HSI)와 물리적 서식처 모의시스템(PHABSIM)을 이용한 최적 생태유량을 산정하였다. 본 지점에서 채집된 종수는 20종이였으며, 우점종은 쉬리(22.4%), 아우점종은 피라미(22.0%)였다. 생태적 건강성은 50점 만점의 평가점수에서 $34{\sim}42$점으로 양호에서 좋은 상태로 나타났다. 3종의 대표어종에 대한 수심, 유속 및 하상재료에 대한 서식지적합도 지수를 물리적서식처 모의시스템에 적용한 결과 계절별로 유량의 차이를 보였으며, 3종에 대한 최적 생태유량은 9.0 cms로 추정하였다.