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김준현(Joonhyun Kim) 인간식물환경학회 2024 인간식물환경학회지 Vol.27 No.2
Background and objective: Many scholars agree that the key to mitigating the environmental crisis lies in altering humanbehavior. To better understand this linkage, it is crucial to identify the psychological determinants of one's pro-environmentalbehavioral intention (PEB) and examine the process through which such behavior is generated. This study focuses on onesuch process, drawing of plants. We test whether visually representing plants by engaging in freehand drawing wouldinfluence actual behavioral intentions to improve the quality of our environment and whether this association is mediatedby the key environment-psychological factors (attitude toward plants and affection to the natural environment). Methods: To answer this question, we conducted a quasi-experiment with 235 students from selected colleges in Seoulby dividing them into control and treatment groups. The control group participated in regular outdoor activities during a fieldtrip while the treatment group engaged in drawing of plants during the trip. Survey answers and drawings were analyzedto examine the effect of plant drawing practice on PEB and the mediative role of the psychological constructs. Results: Our T-test and the partial least squares structural equation model (PLS-SEM) test revealed the following findings:(1) Engaging in plant drawing practice is more effective in developing positive attitudes toward plants and affection to thenatural environment than engaging only in normative outdoor experience. (2) Analytical-observational drawings areinfluential to PEB by mediating through plant attitude, and expressive-subjective drawings are influential to PEB bymediating through environmental affect. (3) Gender was a critical factor in determining plant attitude, environmentalattitude, and PEB. Conclusion: In sum, the findings suggest that plant drawing experience has a significant impact on developing PEB, andthus, it can be an effective means to foster a biospheric mindset as well as nature-protective behavior.
김준현 ( Joonhyun Kim ),안수영 ( Sooyoung Ahn ),박민우 ( Minwoo Park ) 한국환경영향평가학회 2020 환경영향평가 Vol.29 No.6
최적의 염소 소독 전략을 구축하기 위해 8개의 연립 준선형 편미분방정식으로 구성된 수학적 모형이 제안되었다. 다차원 수치 프로그램을 개발하기 위해 상류 가중 유한요소법을 사용하였다. 프로그램은 세 가지 유형의 반응기에서 측정된 농도에 대해 검증되었다. 16개의 실험 결과에 대해 경계 조건 및 반응 속도를 보정하여 측정된 값을 재생시켰다. 모델링 결과로부터 8개의 반응 속도계수가 추정되었다. 반응 속도계수는 pH 및 온도로 표현되었다. 반응 속도계수를 추정하기 위해 수치 오차의 제곱의 합을 최소화하는 자동 최적 알고리즘의 프로그램을 개발하고 모형에 결합하였다. 최종 사용지에서 염소 및 오염물의 농도를 최소화하기 위해서는 정수장의 염소소독공정으로부터 최종 사용지까지의 수질 변화를 모형에 의해 예측하고 이를 기반으로 유입수 수질에 따라 염소소독공정을 운영하는 실시간 예측 제어 시스템이 필요하다. 본 모형을 이용하여 정수장에 이러한 시스템을 구축할 수 있을 것이다. A mathematical model comprised with eight simultaneous quasi-linear partial differential equations was suggested to provide optimal chlorination strategy. Upstream weighted finite element method was employed to construct multidimensional numerical code. The code was verified against measured concentrations in three type of reactors. Boundary conditions and reaction rate were calibrated for the sixteen cases of experimental results to regenerate the measured values. Eight reaction rate coefficients were estimated from the modeling result. The reaction rate coefficients were expressed in terms of pH and temperature. Automatic optimal algorithm was invented to estimate the reaction rate coefficients by minimizing the sum of squares of the numerical errors and combined with the model. In order to minimize the concentration of chlorine and pollutants at the final usage sites, a real-time predictive control system is imperative which can predict the water quality variables from the chlorine disinfection process at the water purification plant to the customer by means of a model and operate the disinfection process according to the influent water quality. This model can be used to build such a system in water treatment plants.