• Journal of Korea Water Resources Association
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• v.32 no.5
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• pp.565-577
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• 1999

The geometric patterns of a stream network in a drainage basin can be viewed as a "fractal" with fractal dimensions. Fractals provide a mathematical framework for treatment of irregular, ostensively complex shapes that show similar patterns or geometric characteristics over a range of scale. GIUH (Geomorphological Instantaneous Unit Hydrograph) is based on the hydrologic response of surface runoff in a catchment basin. This model incorporates geomorphologic parameters of a basin using Horton's order ratios. For an ordered drainage system, the fractal dimensions can be derived from Horton's laws of stream numbers, stream lengths and stream areas. In this paper, a fractal approach, which is leading to representation of a 2-parameter Gamma distribution type GIUH, has been carried out to incorporate the self similarity of the channel networks based on the high correlations between the Horton's order ratios. The shape and scale parameter of the GIUH-Nash model of IUH in terms of Horton's order ratios of a catchment proposed by Rosso(l984J are simplified by applying the fractal dimension of main stream length and channel network of a river basin. basin.

• Journal of Korea Water Resources Association
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• v.42 no.1
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• pp.75-92
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• 2009

The development of the method for flood runoff analysis representing Korean mountain basins have been one of big concerns for Korean hydrologists for several decades. Several traditional methods dealing with unit hydrograph have been restricted to be used in Korea basins, because of its drawbacks due to its originality from other countries and the uncertainties of control parameters as well as its linearity assumption between rainfall and runoff relationship. In this paper, several geomorphological similarity relationships for Korean mountain basins was developed by using the experimental data over 40 Korean basins. Then those were applied directly to geomorphological unit hydrograph theory to meet Korean geomorphological unit hydrograph. The developed method was applied to Andong Dam basin. The results show the applicability and simplicity of the developed Korean geomorphological unit hydrograph generally for Korean mountain basins in future. It might be needed for more validations and applications of this method over Korean regions.

• Journal of Digital Convergence
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• v.12 no.12
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• pp.139-149
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• 2014

This paper aims to examine the moderate effects of LMX on the relationships between appraisal justice and organization commitment. Additionally, This study is to identify the influences of appraisal justice on the organization commitment in the organization. To accomplish these purposes, the main factors of the appraisal justice such as distributive justice, procedural justice and interactional justice were found from the previous studies. This study used the statistical techniques such as descriptive analysis, reliability analysis, discriminant analysis, factor analysis, correlation analysis, multi regression analysis, and hierarchical regression analysis. The following are the summary of hypothesis test: First, all three justice factors are essential to enhance the level of organizational commitment in appraisal about employee of enterprises. Second, interactional justice among factors of appraisal justice have differential influence on organization commitment by LMX.

• The Journal of the Korea Contents Association
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• v.10 no.4
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• pp.274-281
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• 2010

The objective of the present study lied in providing empirical analysis over subjects of revenue officers targeted for suggesting effective managerial way for enhanced job productivity by using team commitment as a mediator in the correlation between trust and job productivity. As a result, it was identified that organizational trust, trust in superiors and trust to colleagues perceived by revenue officers have positive effects on team commitment, while the higher team commitment leads to higher job productivity, accordingly leading to better efficiency in carrying out tax-related administration and improving the level of satisfaction as for tax payers. It demonstrated that managers in tax-related organizations must create the foundation affordable for revenue officers to be widely exposed to participate in organization-related key decision-making processes in such a way that encourages and initiates them to have stronger loyalty and self-confidence based on common identity. Furthermore, much effort shall be continuously paid in designing personnel and organizational management policies in order for them to have faithfulness and adherence to their belonged organization.

• Korean Security Journal
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• no.51
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• pp.61-78
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• 2017

This study aims to empirically validate the relationship between organizational learning transfer climate and the transfer of training and to enhance the transfer of training among South Korean coast guards. The empirical data was collected through 526 South Korean coast guards admitted to the institute, and support by managers and peers, and potential for organizational change were selected as independent variables for multiple regression. As a result, the transfer of training is positively correlated with support of mangers and peers, and potential for organizational change, thus suggesting factors like supervisor participation and long-term educational planning as policy implications for the effective transfer of training to work environment. Though findings from research cannot be generalized to the broader population due to limitations of sampling, this study does find its significance in that organizational learning transfer climate was considered as a key factor influencing the transfer of learning for the first time.

• Journal of Digital Convergence
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• v.10 no.4
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• pp.95-106
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• 2012

The purpose of this paper is that analyze the influence of empowering leadership and constituent individual of organization's creativity and the moderating effect of leader-member exchange. For the verify the variables relationship, we perform the hierarchical regression analysis. As a result, empowering leadership positively effect creativity when appear the leader's leading by example, coaching, informing and showing concerning. And also, we are confirm the moderating effect LMX. To conclude, Empowering leadership influence positive and negative effect to creativity by the sense of the affect, the loyalty, the contribution, professional respect.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2002.11a
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• pp.201-204
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• 2002

심장박동간격은 최근 교감신경과 부교감신경의 안정을 알아보는 척도로 쓰이고 있다. 본 연구 목적은 심장박동변이 측정을 통하여 항균작용 및 원적외선 방사를 하는 특수기능성 직물이 인체의 자율신경계, 감성 및 심리적 변수에 미치는 효과를 알아보는 데에 있다. 총 10명의 피험자를 대상으로 하여 심장박동 간격을 조사하고 시각상사척도를 이용하여 우울, 불안, 피로 그리고 스트레스정도를 착용 전후에 각각 조사하였다. 그 결과 저주파수 적분값과 고주파수 적분값의 비가 착용 전에 비해 착용 후 통계적으로 유의한 차이가 나타났으며 (p<0.05) 우울, 불안, 피로, 스트레스의 값이 유의하게 감소하였다(p<0.05). 본 연구를 통하여 항균, 원적외선 방사를 하는 특수기능성 섬유가 감성이나 자율신경계에 영향을 준다는 것을 관찰할 수 있었다.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.257-260
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• 2010

실제 규모 ISO 9705 표준 화재실에서 액체연료를 대상으로 연소효율 개념에 관한 실험적 연구가 수행되었다. 특히 구획 외부에서 측정되는 총괄연소효율과 구획 내부의 고온 상층부에서 측정된 국부연소효율 개념을 비교 검토하였다. 주요 결과로서, 총괄연소효율은 총괄당량비 증가에 따라 비교적 선형적인 감소경향을 보였다. 반면에 국부연소효율은 총괄당량비가 증가함에 따라 2차 곡선의 형태로 크게 감소됨을 확인하였다. 위 결과를 통해 국부연소 효율에 대한 정보는 구획 내부의 화재현상을 이해하는데 유용한 변수임을 알 수 있었다. 또한 국부연소효율은 구획화재의 상사과정에서 중요한 변수로 사용될 수 있음을 논의하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2020.06a
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• pp.332-332
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• 2020

본 연구에서는 유역 출구에서의 첨두유속과 Clark 모형 매개변수 간의 관계를 검토하였다. 첨두유속과 집중시간의 관계가 먼저 검토되었으며, 이후 집중시간과 저류상수의 관계가 검토되었다. 이를 위해, 다년간의 수위 관측 및 유속 및 유량 측정 성과가 있는 지점들이 선정되었다. 분석을 위해 관측 수위 및 수위-유량 곡선이 존재하는 호우사상들이 고려되었으며, 이 중 첨두유속 자료가 존재하는 사상들이 첨두유속과 집중시간 관계 검토를 위해 고려되었다. 본 연구의 결과를 요약하면 다음과 같다. (1) 호우사상 규모가 커짐에 따라 첨두유속은 크게, 집중시간은 작게 나타나며, 이 둘은 선형적인 관계를 가진다. (2) 집중시간과 저류상수는 호우사상 규모에 관계없이 유역별로 어느 정도 일정하게 나타나며, 이는 유역의 상사성과 높은 상관을 가진다.

• Fire Science and Engineering
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• v.28 no.4
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• pp.29-34
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• 2014

In this study, to assess the validity of scaling law which was based on the ventilation factor and utilized in fields of compartment fires, numerical simulations were conducted on full- and 2/5 reduced-scale compartment fires using FDS and simulation results were compared with the previously published experimental data. The numerical modeling used in this study was verified by comparing the predicted temperature at several points of the upper layer with the experiment data. Temperature and concentration distribution inside of compartments and velocity profile at door of compartment are analyzed to assess the validity of scaling law. Comparison between the predicted results on the full- and reduced-scale compartments shows good agreements on the inner compartment flow patterns, outflowing flame patterns from the compartments, and vertical temperature distributions.