• Current Research on Agriculture and Life Sciences
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• 제5권
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• pp.134-142
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• 1987

The purpose of this study is to establish more rational and practical planning theory for amusementpark. It analyze and considerate the fluctuation of the people who come and use a Tong-Ch'on amusementpark. The results drawn from this research work are as follows ; There are considerable correlation between use fluctuation and some factors. The factors are season (spring, summer, autumn) as a time, temperature, cloud amount, duration of sunshine, weather (rainy day) as a climate and date (weekday, holiday) as a social system. The important variables are temperature, cloud amount, duration of sunshine and date (week day, holiday) to estimate the user of amusementpark. I can reduce the following two types of regression models. 1.${\log}_eY1=6.9114+0.1135TEM+0.00002_eSUM-0.4068WI+0.4316W3$ ($R^2=0.94$) 2. ${\log}_eY2=7.2069+0.1177TEM-0.0990CLO+0.488W3$ ($R^2=0.95$) Y ; Number of User TEM ; Temperature CLO ; Amount of cloud SUN ; Duration of Sunshine WI ; Weekday W3 ; Holiday Those model is inorder to estimate the user for management of Tong-Ch'on amusementpark and use on the computation of facility size for reconstruction. Besides the amusementpark, city park and outdoor recreation area could estimate of user throuth this method. But, I am not sure about the regression models because I didn't apply the regression models to the other amusementpark, city park or outdoor recreation area. Therefore, I think that this problem needs to study in the future.

• Steel and Composite Structures
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• 제34권2호
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• pp.261-277
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• 2020

The main objective of this research paper is to consider vibration analysis of vacancy defected graphene sheet as a nonisotropic structure via molecular dynamic and continuum approaches. The influence of structural defects on the vibration of graphene sheets is considered by applying the mechanical properties of defected graphene sheets. Molecular dynamic simulations have been performed to estimate the mechanical properties of graphene as a nonisotropic structure with single- and double- vacancy defects using open source well-known software i.e., large-scale atomic/molecular massively parallel simulator (LAMMPS). The interactions between the carbon atoms are modelled using Adaptive Intermolecular Reactive Empirical Bond Order (AIREBO) potential. An isogeometric analysis (IGA) based upon non-uniform rational B-spline (NURBS) is employed for approximation of single-layered graphene sheets deflection field and the governing equations are derived using nonlocal elasticity theory. The dependence of small-scale effects, chirality and different defect types on vibrational characteristic of graphene sheets is investigated in this comprehensive research work. In addition, numerical results are validated and compared with those achieved using other analysis, where an excellent agreement is found. The interesting results indicate that increasing the number of missing atoms can lead to decrease the natural frequencies of graphene sheets. It is seen that the degree of the detrimental effects differ with defect type. The Young's and shear modulus of the graphene with SV defects are much smaller than graphene with DV defects. It is also observed that Single Vacancy (SV) clusters cause more reduction in the natural frequencies of SLGS than Double Vacancy (DV) clusters. The effectiveness and the accuracy of the present IGA approach have been demonstrated and it is shown that the IGA is efficient, robust and accurate in terms of nanoplate problems.

• 대한원격탐사학회지
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• 제18권6호
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• pp.337-344
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• 2002

일반적으로 위성영상으로부터 위치정보를 획득하기 위해서는 센서와 촬영대상간의 기하학적 관계를 규명하는 센서모델링이 선행되어야 한다. 그러나 Linear CCD (Charge Coupled Device) 배열에 의해 얻어지는 Pushbroom 위성영상은 Frame 센서에 의해 얻어지는 영상과 달리 영상을 획득하는 동안에 투영중심의 위치와 자세가 시간에 따라 변하기 때문에 정확한 센서모델링에 어려움이 있다. 또한 영상에 대한 궤도정보가 알려지지 않거나 불확실한 경우에는 물리적 센서모델의 적용에 어려움이 따르게 된다. 따라서 본 논문에서는 인공위성의 궤도정보가 알려지지 않거나 불확실한 경우에 Frame, Pushbroom, Whiskbroom, SAR 영상 등 다양한 영상자료에 적합한 센서모델로서 RFM(Rational Function Model)의 적용가능성을 검토하였다. 이를 위해서 KOMPSAT EOC 영상과 SPOT영상에 RFM을 적용하였으며, 지상기준점을 20개, 30개, 40개, 50개, 60개, 70개의 경우로 나누어 지상기준점의 개수와 배치 및 RFM 계수의 차수변화에 따른 RFM의 정확도를 분석하였다. 또한 수학적 모델 중에 하나인 DLT를 구현하여 RFM과 비교하였다.

• 교육시설 논문지
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• 제25권6호
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• pp.35-44
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• 2018

The purpose of this study is to predict more accurate construction costs and to support efficient decision making in the planning and design stages of smart education facilities. The higher the error in the projected cost, the more risk a project manager takes. If the manager can predict a more accurate construction cost in the early stages of a project, he/she can secure a decision period and support a more rational decision. During the planning and design stages, there is a limited amount of variables that can be selected for the estimating model. Moreover, since the number of completed smart schools is limited, there is little data. In this study, various artificial intelligence models were used to accurately predict the construction cost in the planning and design phase with limited variables and lack of performance data. A theoretical study on an artificial neural network and deep learning was carried out. As the artificial neural network has frequent problems of overfitting, it is found that there is a problem in practical application. In order to overcome the problem, this study suggests that the improved models of Deep Neural Network and Deep Belief Network are more effective in making accurate predictions. Deep Neural Network (DNN) and Deep Belief Network (DBN) models were constructed for the prediction of construction cost. Average Error Rate and Root Mean Square Error (RMSE) were calculated to compare the error and accuracy of those models. This study proposes a cost prediction model that can be used practically in the planning and design stages.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제24권2호
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• pp.103-114
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• 2021

본 연구는 소수 나눗셈에서의 '몫'과 '나머지' 용어 사용의 문제점을 인식하고 이를 개선하기 위한 방안을 탐색하였다. 지금까지의 선행 연구와 현행 교과서를 분석한 결과, '몫', '나머지' 용어 사용에 대해 연구자마다 상이한 견해를 주장한 근원에 나눗셈 알고리즘에서의 q, r값과 계산 결과의 해석에 따른 결과 값과 남는 양을 동일하게 보는 데에 원인이 있음을 밝히고, 소수 나눗셈의 '몫'과 '나머지' 취급에 대한 일관된 관점과 교과서 개선 방안을 제안하였다. 즉, 나눗셈 알고리즘 b=a×q+r에 의한 소수 나눗셈의 결과인 q, r을 '몫', '나머지'로 보고, 문제 맥락에 따라 q와 같거나 작은 양을 최종적인 '결과 값'으로, 결과 값을 취하고 난 잔여량을 '남는 양'으로 지칭할 것을 제안하였다. 또한, 몫을 반올림하여 나타낸 근삿값을 '몫'으로 지칭하지 않을 것을 제안하였다.

• 한국정보통신학회논문지
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• 제25권2호
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• pp.228-233
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• 2021

비즈니스에 성공한 디자인 혁신 제품사례가 증가함에 따라 디자인 혁신성에 대한 관심도가 높아지고 있다. 본 연구는 블루투스 스피커 제품의 디자인 혁신성 (기능성, 인간공학, 심미성)이 구매고객의 호감도와 구매 의도에 어떠한 영향을 미치는지 살펴보고자 한다. 실증적 연구를 위한 합리적 행위이론(TRA)과 기술수용모델(TAM)을 통한 연구모형을 제언한다. 설문은 디자인 혁신성, 호감도, 구매 의도의 영향 관계를 파악하기 위한 문항으로 구성되었다. 연구결과 기능성, 인간공학, 심미성은 제품의 호감도와 구매 의도에 영향을 주었다. 블루투스 스피커 디자인 혁신 제품이 초기시장에서 수용되기 위해서는, 기능과 심미성을 중심으로 호감도에 대한 긍정적인 태도를 형성하는 것이 무엇보다 중요하다. 호감도는 디자인 혁신 제품의 구매 의도에 가장 결정적인 영향을 미치는 요인으로서 기업은 호감도에 긍정적인 영향을 미치는 다양한 요인을 발굴, 강화해야 한다.

• 한국IT서비스학회지
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• 제21권4호
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• pp.1-26
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• 2022

Recently, the number of cases of purchasing food online has been increased, especially in the open market. Therefore, we examined the characteristics of status quo bias and switching costs in the open market. Also, in this study, the causal relationship between the characteristics of status quo bias and switching costs, switching costs and switching intention in the open market was investigated. The analysis result consists of four parts as follows. First, in the open market, rational decision making, which belongs to the characteristics of status quo bias, was found to have a positive (+) effect on time switching cost among switching costs, but did not have a positive (+) effect on economic and psychological switching cost. Second, cognitive misperceptions was consistent with the assumption that it have a positive (+) effect on all of the economic, time, and psychological switching cost, which are switching costs in the open market. Third, psychological commitment was found to have a positive (+) effect on economic and time switching cost among switching costs, but did not have a positive (+) effect on psychological switching cost. Fourth, psychological switching cost, which belongs to switching costs in the open market, was found to have a negative (-) effect like the hypothesis set in switching intention. However, it was found that economic and time switching cost did not have a negative (-) effect on switching intention. This study subdivided the switching costs into three dimensions and compared the degree of influence on the switching intention, and the degree of influence was different for each dimension. Therefore, it was found that when switching from the existing open market to the new open market, it is not possible to simply judge that the switching costs directly has a negative (-) effect on the switching intention or does not.

• 인간식물환경학회지
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• 제24권4호
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• pp.341-353
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• 2021

Background and objective: As the agricultural industry becomes a more convergent industry, it is believed that the demand for human resources by companies will change. Therefore, a survey was conducted to investigate the human resources required by agriculture companies. Methods: In the survey on 77 agriculture companies, 98.7% of respondents answered that new employees with a college degree needed additional training to adapt to practical affairs. Results: The first priority of education was "community spirit" (22.1%) and the second priority was "convergence capability" (15.6%). The most important educational goal desired by agricultural companies was "cultivating human resources with community spirit and ethical judgment", followed by "cultivating human resources with serious communication and problem-solving skills", and "cultivating human resources with scientific thinking and unique creative imagination." Sub-competencies that companies want agricultural colleges to strengthen were "community spirit" 4.32(SD=0.96), "desirable values" 4.30 (SD = 1.05), "sympathy" 4.28 (SD = 0.95), "convergence capability" 4.16 (SD = 0.88), "creativity" 4.11 (SD = 0.83), "civic spirit" 4.10 (SD = 0.91), and "rational/critical thinking" 3.94 (SD = 1.04). There was a significant difference in sub-competencies that require reinforcement depending on the number of full-time employees. "Creativity" was most necessary in companies with less than 3 employees (4.39), and 4~7 employees (4.33), and "aesthetics"" in companies with less than 3 employees (3.94), and 4-7 employees (3.61) "Civic spirit" was most necessary in companies with 31 employees or more (4.33). Conclusion: The most important educational goal desired by companies was "cultivating human resources with community spirit and ethical judgment".

• 보건행정학회지
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• 제3권2호
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• pp.81-99
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• 1993

The purpose of this research is to assess the geographical distribution of physicians and dentists and the degree of maldistribution of the physician. Data were obtained form the Korean Medical Association's report on physicians registry and census for 1990. To assess the degree of disparity in the rural-urban distribution of physician manpower and to identify changes in the distribution pattern, the Gini index of concentration was used. Major findings are as follows; 1. Urban-rural disparity in the distribution of physician manpower exists in all categories of manpower, i.e. physician, dentist, oriental medical doctor, general practitioner, medical specialist, practitioner, public health physician and public health dentist. Urban area which had 74.4% of nation's population, accounted for over 90% of all physician manpower. 2. In terms of the ration of physician manpower per 10, 000 population, in urban area, they were 8.2 physicians, 2.7 general practitioners, 5.5 specialists, 3.0 practitioners, 1.8 dentists and 1.3 oriental medical doctors. In rural area, the ratios were 1.4 physicians, 0.6 general practitioners, 0.9 specialists, 1.0 practitioners, 0.4 dentists and 0.4 oriental medical doctors. 3. Gini indicies computed to measure inequality of physician manpower distribution were 0. 3675 for physicians, 0.3372 for general practitioners, 0.3338 for specialists, 0.2263 for practitioners, 0.3132 for dentists and 0.3293 for oriental medical doctors. 4. Inspite of increase in the number of physician manpower, urban concentration of physician manpower intensified from 1980 to 1990. However, the Gini index for all physician manpower fell by 18.3~36.7% from 1980 to 1990, indicating more even distribution. 5. In rural area, the public health physicians and dentists had increased the ratios of physicians, general practitioners, practitioners and dentists per 10, 000 population remarkebly, and had decreased the Gini indicies of physicians, general practitioners, practitioners and dentists. Thus, public health physicians and dentists contributed to improve the distribution of physician manpower in rural area. Based on the results of this study, long-term and rational manpower policies should be developed to solve the problem of geographical maldistribution of physician manpower as well as short-term policy for inducing physicians to the rural areas.

• 한국전자통신학회논문지
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• 제18권2호
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• pp.329-335
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• 2023

타임지가 선정한 슈퍼푸드이며, 후숙 과일 중 하나인 아보카도는 현지가격과 국내 유통 가격이 크게 차이가 나는 식품 중 하나이다. 이러한 아보카도의 분류과정을 자동화한다면 다양한 분야에서 인건비를 줄여 가격을 낮출 수 있을 것이다. 본 논문에서는 아보카도의 데이터셋을 크롤링을 통하여 제작하고, 딥러닝 기반 전이학습모델을 다수 사용하여, 최적의 분류모델을 만드는 것을 목표로 한다. 실험은 제작한 데이터셋에서 분리한 데이터셋에서 딥러닝 기반 전이학습모델에 직접 대입하고, 해당 모델의 하이퍼 파라미터를 Fine-tuning하며 진행하였다. 제작된 모델은 아보카도의 이미지를 입력하였을 때, 해당 아보카도의 익은 정도를 99% 이상의 정확도로 분류하였으며, 아보카도 생산 및 유통가정의 인력감소 및 정확성을 높일 수 있는 데이터셋 및 알고리즘을 제안한다.