• Journal of the Korean Society of Environmental Restoration Technology
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• v.11 no.1
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• pp.85-95
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• 2008

This study was carried out to analyze Sungkyunkwan University Forest vegetation at Pocheon. Employing the releve method of Braun-Blanquet, 20 plots were sampled. The communities were classified into Larix leptolepis community, Quercus mongolica community, Pinus koraiensis community and Pinus densiflora community. Average coverage rate was 91% in tree layer, 39% in subtree layer, 44% in shrub layer, 43% in herb layer, respectively. The importance values were 61.79% in Larix leptolepis, 52.08% in Quercus mongolica, 44.6% in Pinus koraiensis, 30.35% in Pinus densiflora, 17.78% in Styrax obassia, 10.9% in Fraxinus rhynchophyllia. DBH range of most Quercus mongolica was between 6cm and 15cm. Therefore, Quercus mongolica will be dominant species in the study area for several more decades.

• Journal of information and communication convergence engineering
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• v.22 no.2
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• pp.133-138
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• 2024

Dissolved oxygen (DO) is an important factor in ecosystems. However, the analysis of DO is frequently rather complicated because of the nonlinear phenomenon of the river system. Therefore, a convenient model-free algorithm for DO variable is required. In this study, a data-driven algorithm for predicting DO was developed by combining XGBoost and an artificial neural network (ANN), called ANN-XGB. To train the model, two years of ecosystem data were collected in Anyang, Seoul using the Troll 9500 model. One advantage of the proposed algorithm is its ability to capture abrupt changes in climate-related features that arise from sudden events. Moreover, our algorithm can provide a feature importance analysis owing to the use of XGBoost. The results obtained using the ANN-XGB algorithm were compared with those obtained using the ANN algorithm in the Results Section. The predictions made by ANN-XGB were mostly in closer agreement with the measured DO values in the river than those made by the ANN.

• Journal of Digital Convergence
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• v.14 no.12
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• pp.95-103
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• 2016

This study is the analysis of actual proof about how the CEO's values system affects the organizational performance. To this end, we analyzed the content of forty different actual CEOs' values system through in-depth interviews. In addition, we verify the impact of the CEO's values system on organizational performances depending on the employee's awareness and sympathy. The organizational performance is analyzed in two different areas, social and financial performance, and significant results are obtained in both areas. In particular, we interview the CEOs directly, which is usually difficult to access, to analyze the values system and study the employee's awareness and sympathy for the values system. The Study puts emphasis on the importance of the process of achieving the employee's awareness and sympathy, rather than the values system contents itself. And it is necessary for verifying through much more company samples from further study.

• The Journal of Korean Physical Therapy
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• v.10 no.1
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• pp.45-52
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• 1998

Since isokinetic concise can give an evaluation of muscle strength with great accuracy and objectively, it is widely used as the one of the important methods for evaluation of muscle performance. The purpose of this investigation was to compare values uncorrected for gravity with values corrected for gravity and to determine the effect of making this correction on knee flexors and extensors at three speeds. This investigation measured values isokinetically at $60^{\circ}/sec,\;120^{\circ}/sec,\;and\;180^{\circ}/sec$ in 14 male and 17 fermale university students. The gravity effect torque(GET) is the torque resulting from the effect of gravity on the combined weight of the leg and dynamometer arm. The GET was added to the measured extensors peak torque and subtraced from the flexors peak torque to yield gravity corrected values. Failure to consider GET greatly underetimated extensors torque and overtestimated flexors torque. Physical therapists must remember the importance of making the gravity correction in patients with reduced torque output where the gravitational torque is a greater percentage of the measured torque to ascertain correctly the relative strength of antagonists inversely affected by gravity.

• Journal of Korean Society of Water and Wastewater
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• v.12 no.2
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• pp.50-58
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• 1998

Genetic Algorithm (GA) consists of selection, reproduction, crossover and mutation processes and many parameters including population size, generation number, the probability of crossover (Pc) and the probability of mutation (Pm). Determining values of the parameters is found critical in the whole optimization process and a sensitivity analysis with them seems mandatory. This paper tries to demonstrate such importance of sensitivity analysis of GA using an example water supply tunnel network of the New York City. For optimization of the network with GA, Pc and Pm vary from 0.5 to 0.9 by an increment of 0.1 and from 0.01 to 0.05 by an increment of 0.01, respectively, while fixing both the population size and the generation number to 100. This sensitivity analysis results in an optimum design of 22.3879 million dollars at the values of 0.8 and 0.01 for Pc and Pm, respectively. In addition, the probability of recombination (Pr) is introduced to check its applicability in the GA optimization of water distribution network. When Pr is 0.05 with the same values of Pc and Pm as above, the optimum design costs 20.9077 million dollars. This is lower than the cost of 22.3879 million dollars for the case of not using Pr by 6.6%. These results indicate that conducting a sensitivity analysis with parameter values and using Pr are useful in the optimization of WDN.

• The Korean Journal of Community Living Science
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• v.27 no.3
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• pp.387-403
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• 2016

This study explored the relationships between unmarried adult children and their coresident parents with a focus on the role of intergenerational exchanges and family values affecting parent-child relations. A total of 767 unmarried adult children who lived with their parents were selected from the data of the third National Korean Family Survey in 2015. The main findings were that coresident adult children exchange diverse resources with their parents and that exchange patterns whether receiving more or giving more differed depending on the helping dimensions. 'Receiving' type was more prominent in the dimension of practical help, while, 'receiving and giving' type was more noticeable in the dimension of emotional help. Findings also suggest that intergenerational exchange and family values contribute to parent-child relationship quality. While being an active provider of practical help is positively associated with relationship quality, being a recipient of emotional help is related to a higher level of relationship quality compared to being indifferent. In addition, a stronger value of family responsibility was associated with a higher level of relationship quality. These findings indicate that the importance of the practical and emotional component in the relationships between unmarried adult children and their co-resident parents and reciprocal intergenerational exchange and strong family values may be contributory factors to better parent-child relationships.

• Journal of Fashion Business
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• v.7 no.6
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• pp.21-31
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• 2003

The CLI(Consumer Life Information) is a new study to unite and create new values recognizing the importance of knowledge and information in information-oriented society based on domestic science and digital technology. The objective of this research is to define academic identity of consuming science and CLI, to analyze the theory, styles, manners, psychology and the concept of consumption, which is the base of consuming life, and to present the direction of CLI with tasks and three major axises of CLI. Nowadays, international order demands new paradigms from human beings. Especially, vision and creation of the values are settled as methodological ways considering the economic power. The CLI should be on the same horizon adjusting social change of pointing values and quality in consuming patterns of diversity and variety. Therefore, I would suggest the ways for the CLI to head for as follows. First, it is to perceive the 3 major Axises & Task of CLI. Second, it is to develope service (experiencing goods) and goods that can lead consuming lives. Third, it is to study merchandising strategy, to create new signs and symbols of goods, and to collaborate of R & D(reseach and developement) and Business. Fourth, it is to head for globalization. Consequantly, this study will be helpful to establish the theory of relationship between producer and consumer in fashion business included research and developments of qualitative goods.

• Journal of the Korean Society of Food Culture
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• v.32 no.2
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• pp.89-98
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• 2017

To enrich a country's food culture, it is essential that residents understand and care about that culture. Although various efforts to globalize Korean food have been made outside Korea, the importance of understanding Koreans' perception of and increasing interest in Korean food has been neglected. Thus, this study was conducted to identify the cognitive structures regarding Korean food among 30 Koreans living in metropolitan cities using in-depth laddering interviews based on the means-end chain theory. The most dominant cognitive structures toward Korean food were familiarity (attributes), ease of digestion and health (functional consequences), sense of responsibility and will to live (psychosocial consequences), and family affection and sense of achievement (values). In short, Koreans were found to consume Korean food to achieve perceived high-dimensional values rather than simply for its attributes or benefits. These findings have important implications for future strategies and policies aimed at increasing Korean food consumption by Koreans, as they suggest that underlying and symbolic values rather than the attributes of Korean food are more effective in promoting its consumption. Further studies on understanding perceptions and values using a larger Korean population are needed to preserve and further develop Korean food.

• The Research Journal of the Costume Culture
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• v.21 no.5
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• pp.639-654
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• 2013

Understanding consumers' being well and stylishly dressed is a key for marketers' success in ever changing fashion industry. The purpose of this study is to identify the antecedents of dressing style. As antecedents, personal values and clothing-related variables were considered: this study included physical appearance, materialism, and individualism as personal values and quality conscious, price conscious, and brand conscious as clothing related variables. It was hypothesized that personal values influence dressing style both directly and indirectly through clothing related variables. Data were gathered by surveying university students in Seoul, using convenience sampling. Three hundred eleven questionnaires were used in the statistical analysis, exploratory factor analysis using SPSS and confirmatory factor analysis and path analysis using structural equation modeling. The results showed that all the fit statistics for the variable measures were quite acceptable. In addition, the overall fits of the model suggest that the model fits the data well. The hypothesized relationship test also showed that individualism among personal values directly influences dressing style and that only price consciousness among clothing-related variables influences dressing style. With respect to the relative importance, individualism showed the largest standardized regression weight. The results suggest effective product, price, and promotion strategies for marketers whose target market is style conscious consumers.

• Geomechanics and Engineering
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• v.5 no.6
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• pp.541-564
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• 2013

In this study, artificial neural networks (ANNs) were used to predict the settlement of pad footings on cohesionless soils based on standard penetration test. To achieve this, a computer programme was developed to calculate the settlement of pad footings from five traditional methods. The footing geometry (length and width), the footing embedment depth, $D_f$, the bulk unit weight, ${\gamma}$, of the cohesionless soil, the footing applied pressure, Q, and corrected standard penetration test, $N_{cor}$, varied during the settlement analyses and the settlement value of each footing was calculated for each method. Then, an ANN model was developed for each traditional method to predict the settlement by using the results of the analyses. The settlement values predicted from the ANN model were compared with the settlement values calculated from the traditional method for each method. The predicted values were found to be quite close to the calculated values. It has been demonstrated that the ANN models developed can be used as an accurate and quick tool at the preliminary designing stage of pad footings on cohesionless soils without a need to perform any manual work such as using tables or charts. Sensitivity analyses were also performed to examine the relative importance of the factors affecting settlement prediction. According to the analyses, for each traditional method, $N_{cor}$ is found to be the most important parameter while ${\gamma}$ is found to be the least important parameter.