• Journal of Korean Society of Coastal and Ocean Engineers
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• 제26권3호
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• pp.174-183
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• 2014

Seabed beneath and near coastal structures may undergo large excess pore water pressure composed of oscillatory and residual components in the case of long durations of high wave loading. This excess pore water pressure may reduce effective stress and, consequently, the seabed may liquefy. If liquefaction occurs in the seabed, the structure may sink, overturn, and eventually increase the failure potential. In this study, to evaluate the liquefaction potential on the seabed, numerical analysis was conducted using the expanded 2-dimensional numerical wave tank to account for an irregular wave field. In the condition of an irregular wave field, the dynamic wave pressure and water flow velocity acting on the seabed and the surface boundary of the composite breakwater structure were estimated. Simulation results were used as input data in a finite element computer program for elastoplastic seabed response. Simulations evaluated the time and spatial variations in excess pore water pressure, effective stress, and liquefaction potential in the seabed. Additionally, the deformation of the seabed and the displacement of the structure as a function of time were quantitatively evaluated. From the results of the analysis, the liquefaction potential at the seabed in front and rear of the composite breakwater was identified. Since the liquefied seabed particles have no resistance to force, scour potential could increase on the seabed. In addition, the strength decrease of the seabed due to the liquefaction can increase the structural motion and significantly influence the stability of the composite breakwater. Due to limitations of allowable paper length, the studied results were divided into two portions; (I) focusing on the dynamic response of structure, acceleration, deformation of seabed, and (II) focusing on the time variation in excess pore water pressure, liquefaction, effective stress path in the seabed. This paper corresponds to (II).

• Journal of Korean Society of Coastal and Ocean Engineers
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• 제26권3호
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• pp.160-173
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• 2014

Seabed beneath and near coastal structures may undergo large excess pore water pressure composed of oscillatory and residual components in the case of long durations of high wave loading. This excess pore water pressure may reduce effective stress and, consequently, the seabed may liquefy. If liquefaction occurs in the seabed, the structure may sink, overturn, and eventually increase the failure potential. In this study, to evaluate the liquefaction potential on the seabed, numerical analysis was conducted using the expanded 2-dimensional numerical wave tank to account for an irregular wave field. In the condition of an irregular wave field, the dynamic wave pressure and water flow velocity acting on the seabed and the surface boundary of the composite breakwater structure were estimated. Simulation results were used as input data in a finite element computer program for elastoplastic seabed response. Simulations evaluated the time and spatial variations in excess pore water pressure, effective stress, and liquefaction potential in the seabed. Additionally, the deformation of the seabed and the displacement of the structure as a function of time were quantitatively evaluated. From the results of the analysis, the liquefaction potential at the seabed in front and rear of the composite breakwater was identified. Since the liquefied seabed particles have no resistance to force, scour potential could increase on the seabed. In addition, the strength decrease of the seabed due to the liquefaction can increase the structural motion and significantly influence the stability of the composite breakwater. Due to limitations of allowable paper length, the studied results were divided into two portions; (I) focusing on the dynamic response of structure, acceleration, deformation of seabed, and (II) focusing on the time variation in excess pore water pressure, liquefaction, effective stress path in the seabed. This paper corresponds to (I).

• Journal of Fashion Business
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• 제11권4호
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• pp.1-17
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• 2007

The purpose of this study was to provide for the useful fundamental data to enterprise which produces the natural-dyed clothing products by investigating with the holding conditions and pursuit of wearing images. The subjects were females aged 20 to 59, a questionnaire was developed by the researcher and distributed to 237 females. A sample of 223 females responded to the questionnaire. Data analyses were processed by SPSS WIN 10.0 Program; Frequency count and percentage, $X^2-test$, ANOVA and Duncan's multiple range test were used for statistical analysis. The results of this study were as follows: First, there were significant differences in holding items, period and private ownership according to age, any academic background and a monthly income. Second, the result by classification of the pursuit of wearing images could be identified four factors: factor 1) sexual and feminine image, factor 2) simple and common image, factor 3) comfortable and natural image and factor 4) dynamic image.

• International Journal of Automotive Technology
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• 제3권4호
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• pp.165-170
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• 2002

For a vehicle Anti-lock Braking System (ABS), the control target is to maintain friction coefficients within maximum range to ensure minimum stopping distance and vehicle stability. But in order to achieve a directionally stable maneuver, tire side forces must be considered along with the braking friction. Focusing on combined braking and turning operation conditions, this paper presents a new control scheme for an ABS controller design, which calculates optimal target wheel slip ratio on-line based on vehicle dynamic states and prevailing road condition. A fuzzy logic approach is applied to maintain the optimal target slip ratio so that the best compromise between braking deceleration, stopping distance and direction stability performances can be obtained for the vehicle. The scheme is implemented using an 8-DOF nonlinear vehicle model and simulation tests were carried out in different conditions. The simulation results show that the proposed scheme is robust and effective. Compared with a fixed-slip ratio scheme, the stopping distance can be decreased with satisfactory directional control performance meanwhile.

• Journal of Fashion Business
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• 제13권1호
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• pp.1-16
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• 2009

The purpose of this study was to evaluate the clothing image of the Daks and Superior golf wear, and to compare the perceiver's image perception with clothing image in fashion industry, and to find out the differences of image perception between the buying groups and non-buying groups of the Daks and Superior golf wear, for developing the possibility and strategy of the golf wear market for the apparel marketers and manufacturers. In this study, the data obtained from 193 respondents were analyzed by the descriptive statistics, average analysis. The results from the data were as follows : The questionnaire of the image evaluation rated on 7 point Likert-type scales in the 17 features were evaluated by perceivers. The clothing images by 103 respondents(Daks group) were not in accord with the clothing images expressed on homepage of the Daks golf wear. In the other hands, the clothing images by the 90 respondents(Superior group) were in accord with the clothing images expressed on homepage of the golf wear. There were significant differences in evaluating the clothing images between the buying groups and non-buying groups of the Daks and Superior golf wear. The buying groups of the Daks and Superior golf wear perceived the clothing image of the Daks and Superior golf wear more dynamic, positive than the non-buying groups.

• Korean Institute of Interior Design Journal
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• 제24권4호
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• pp.51-60
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• 2015

This study aims to establish the foundation for a simultaneity research, draw the potential through Bergson's simultaneity, and explore a space with the possibility of a continued change, focusing on the simultaneous process, in which physical mobility and consciousness of space last together. First, this study was focused on understanding Bergson's simultaneity, on the basis of the perspective that space needs to have more active, dynamic mobility. For understanding Bergson's simultaneity, the understanding of Bergson's duration conception, memory and perception was preceded. After that, the characteristics of simultaneity were extracted from the concepts of duration, change, memory and perception and its characteristics, which are connected to space, were analyzed. As a result, the study on simultaneity that was intensively analyzed, based on diverse cases, re-awakened the basis of value or thought, which we must aim at, in space design of the present time. This shows the possibility of another creative form that can be found in spaces of the present time and serves as the foundation to discover an essential and potential value of space in space design. Moreover, the combination of space with science, humanities, art and digital media technology demonstrated once again that there is a good possibility of approaching non-representational space that is pursued today and it is anticipated that using Bergson's simultaneity as a medium for spatial combination in their relationship would help in drawing deeper internal meaning and potential of space.

• Earthquakes and Structures
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• 제9권4호
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• pp.911-936
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• 2015

This work evaluates the performance of a number of seismic assessment procedures when applied to a case study reinforced concrete (RC) wall building. The performance of each procedure is evaluated through its ability to accurately predict deformation demands, specifically, roof displacement, inter-storey drift ratio and wall curvatures are considered as the key engineering demand parameters. The different procedures include Direct Displacement-Based Assessment, nonlinear static analysis and nonlinear dynamic analysis. For the latter two approaches both lumped and distributed plasticity modelling are examined. To thoroughly test the different approaches the case study building is considered in different configurations to include the effects of unequal length walls and plan asymmetry. Recommendations are made as to which methods are suited to different scenarios, in particular focusing on the balance that needs to be made between accurate prediction of engineering demand parameters and the time and expertise required to undertake the different procedures. All methods are shown to have certain merits, but at the same time a number of the procedures are shown to have areas requiring further development. This work also highlights a number of key aspects related to the seismic response of RC wall buildings that may significantly impact the results of an assessment. These include the influence of higher-mode effects and variations in spectral shape with ductility demands.

• Journal of Biomedical Engineering Research
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• 제29권4호
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• pp.286-294
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• 2008

This work investigates the characteristics of brain interactions of experienced Zen-Buddhist practitioners by obtaining multichannel EEG (electroencephalogram) data. Brain interactions were compared among three phases-40-minute meditation (M), 5-minute Chakra-focusing practice (Z) and rest with closed eyes (R). The similarity index S, developed in nonlinear dynamical system theory, was employed to measure the degree of possibly asymmetric coupling. Meditators exhibited, overall, stronger interactions among multiple cortical areas in meditation stages M and Z than in the R state. This enhancement was greater in the M stage when the meditator was accompanied by a thought-free and fully consciousness state. In the high-frequency band (>13Hz), the interdependence was also higher in both meditation stages than at baseline rest. However, the interaction strength, especially in the posterior regions, was greatest in the Z stage, which involved internal attention. Few electrode pairs were observed with significant pair-wise asymmetry in the Z state. The similarity is a possible characteristic of dense reciprocal and strong mutual interactions between multiple cortical areas during meditation - especially in the Z state in the high-frequency band. These results demonstrate that profound Zen meditation induces various dynamic states in different phases of meditation, possibly reflected by nonlinear interdependence measure.

• Proceedings of the Korea Technology Innovation Society Conference
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• 한국기술혁신학회 2015년도 추계학술대회 논문집
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• pp.884-906
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• 2015

본 연구는 공공연구기관의 기술이전 효율성을 분석하기 위해 효율성 분석기법인 DEA를 활용하였다. 투입요소로 연구비, 연구인력, TLO 인력, TLO 운영비 네 가지를, 산출요소로 기술이전 계약건수, 기술이전 수입료 두 가지를 선정하여 기술이전 효율성을 산출하였다. 기술이전 효율성에 영향을 미치는 변수로 지역적 위치, 연구기관 유형, 민간부문 연구개발비 비중, 인센티브 제도 등을 고려하여 산출된 효율성을 비교하였다. 본 연구의 분석을 통해 다음의 4가지 시사점을 도출하였다. 첫째, 연구기관 지방이전 시 먼저 인프라를 구축하고 산학연협력이 제대로 이뤄질 수 있는 환경을 조성해야 한다는 것이다. 둘째, 연구기관별로 설립 목적에 맞는 R&D를 수행할 수 있도록 해야 한다. 셋째, 민간수탁 증대가 R&D 효율성(기술이전 효율성)과 직접적으로 연결이 될 거라는 단편적인 생각은 버리고 폭넓은 의견수렴과 심층적 조사가 필요하다. 넷째, 인센티브 제도나 규정을 운영함에 있어 TLO 인력에게 직접적인 동기요인으로 작용할 수 있는 장치를 만들어야 한다. 본 연구의 분석을 통해 정부 연구기관들의 기술이전 효율성에 대한 이해를 높이고, 도출된 시사점을 바탕으로 국가 R&D 체계를 개선하는데 유의미한 정책의 개발이 있을 것으로 기대한다. 또한 공공연구기관의 기술이전에 대한 관심과 논의가 확대되고, 향후 축적될 자료를 활용한 정교한 연구가 활발히 이어지기를 희망한다.

• Journal of Distribution Science
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• 제15권12호
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• pp.41-51
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• 2017

Purpose - This study proposes the impact of the US and Korean economic policy uncertainty on macroeconomy, and its effect on Korea. The economic policy uncertainty index of the US and Korea is used to represent the economic policy uncertainty on Korean economy. Research design, data, and methodology - In this paper, we collect the eight variables to find out the interrelationship among the US and Korean economic policy uncertainty index of the US and macroeconomic indicators during 1990 to 2016, and use Vector Error Correction Model. Result - The distribution industry stock index in Korea is influenced by the economic policy uncertainty index of the US rather than of Korea. All variables are related negatively to the economic policy uncertainty index of the US and Korea from Vector Error Correction Model. This study shows that the economic policy uncertainty index of the US and Korea has the dynamic relationships on the Korean economy. Conclusions - A higher economic policy uncertainty shows a greater economy recession of a country. Finally, the economic policy uncertainty of the Korea has an intensive impact on Korea economy. Particularly, the economic policy uncertainty of the US has a strong impact on distribution industry stock market in Korea.