• Journal of the Computational Structural Engineering Institute of Korea
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• v.20 no.3
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• pp.255-264
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• 2007

In the current domestic and overseas standards concerning seismic design, especially on the capacity & demand spectra in the multi-story building, failure is caused more by story drift than by displacement; and the existing capacity spectrum method (CSM) does not make a close estimate of story drift because response is derived using displacement. Therefore, this paper proposes an improved CSM to estimate story drift and its direct effect on the collapse of structures, yet still maintaining the same advantage and convenience of the existing CSM about a most basic model of multi-story building: shear building. To establish its reliability, the proposed method is applied to an example model and results are then compared with those obtained through nonlinear time-history analysis.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.6
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• pp.617-627
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• 2011

This paper presents the results of analytical simulation of shake-table responses of a 1:5 scale 10-story reinforcement concrete(RC) residential building model by using the PERFORM-3D program. The following conclusion are drawn based on the observation of correlation between experiment and analysis; (1) The analytical model simulated fairly well the global elastic behavior under the excitations representative of the earthquake with the return period of 50 years. Under the design earthquake(DE) and maximum considered earthquake(MCE), this model shows the nonlinear behavior, but does not properly simulate the maximum responses, and stiffness and strength degradation in experiment. The main reason is considered to be the assumption of elastic slab. (2) Although the analytical model in the elastic behavior closely simulated the global behavior, there were considerable differences in the distribution of resistance from the wall portions. (3) Under the MCE, the shear deformation of wall was relatively well simulated with the flexural deformation being overestimated by 10 times that of experiment. This overestimation is presumed to be partially due to the neglection of coupling beams in modeling.

• Journal of Korean Association for Spatial Structures
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• v.20 no.2
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• pp.51-58
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• 2020

Recently, deep learning that is the most popular and effective class of machine learning algorithms is widely applied to various industrial areas. A number of research on various topics about structural engineering was performed by using artificial neural networks, such as structural design optimization, vibration control and system identification etc. When nonlinear semi-active structural control devices are applied to building structure, a lot of computational effort is required to predict dynamic structural responses of finite element method (FEM) model for development of control algorithm. To solve this problem, an artificial neural network model was developed in this study. Among various deep learning algorithms, a recurrent neural network (RNN) was used to make the time history response prediction model. An RNN can retain state from one iteration to the next by using its own output as input for the next step. An eleven-story building structure with semi-active tuned mass damper (TMD) was used as an example structure. The semi-active TMD was composed of magnetorheological damper. Five historical earthquakes and five artificial ground motions were used as ground excitations for training of an RNN model. Another artificial ground motion that was not used for training was used for verification of the developed RNN model. Parametric studies on various hyper-parameters including number of hidden layers, sequence length, number of LSTM cells, etc. After appropriate training iteration of the RNN model with proper hyper-parameters, the RNN model for prediction of seismic responses of the building structure with semi-active TMD was developed. The developed RNN model can effectively provide very accurate seismic responses compared to the FEM model.

• Proceedings of the Korea Contents Association Conference
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• 2006.11a
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• pp.594-598
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• 2006

Many institutes and organizations carrying out the national R&D projects have and use the expert pool database at each need. But there is lack of human resources information about expert in science and technology part for many policy planning and committee activity, also most of the expert pools are scattered on several database systems. So it is necessary to manage systematically the human resources informations about scientific expert. As the committeeman assignment and committee findings management are conducted by the off-line method, there are wastes of time and labor in committeeman assignment process and committee history management. Therefore we need to provide an effective and automatic process for committeeman assignment and management. In this paper, we construct a database for expert pool who can be used in committee activity or policy planning, and implement a system that services committee management and committeeman assignment process. The human information retrieval service of this system is based on the KRISTAL-2002, an information retrieval and management system developed by KISTI.

• Magazine of the Korea Concrete Institute
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• v.7 no.2
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• pp.126-135
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• 1995

Thermal cracks are occured when thermal stress due to the hydration of cement exceeds the tens~le strength of concrete. Since crackmg causes poor durability of concrete, the effect of ther ma1 cracking should be includod for the design and construction of massive concrete structures. In this study, an experiment is performed for the investigation of time dependent thermal stress history. In order to evaluate thermal stress. two methods are employed. One 1s the evaluation method of thermal stress based on the measurement from embedment stram gauge with non-stress strain gauge and the other 1s based on the measurement from concrete stress gauge. As a result of this study, the value corrected by the former shows good agreement with the latter. The validity of the proposed method for the evaluation of thermal stress 1s explored.

• Journal of the Korean Society of Costume
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• v.50
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• pp.85-96
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• 2000

The study is aimed to analyse social and cultural background and to compare the changes of the cosmetic culture in Korea and the western countries accompanied by the developemnt os the cosmetic industry in the 20th century. The cosmetic culture of Korea has kept on changing adopting the new western style make up, These changes were very closely related with the current sociocultural environments and the developments of the cosmetic industry. The analysis and comparison of Korean cosmetic culture and that of Western countries can be summarized as following: Fistly the cosmetic culture of korea came out after Korean War through the improt of western movies. Secondly at the beginning of accommodation of the western concept of beauty the standards of beauty were confused with that of traditional make up. Thirdly in terms of the history of costumes in the western cosmetic culture the trend was feminine and curve lineal style in the 1910s straight and young style in the 1920s Young elegant curve lineal style and straight-line style replaced among themselves in every 10 years and the cycle became more rapid after the 1970s and there were diversity in the cosmetic culture affected by the postmodernism Fourthly the cosmetic culture of :total fashion" was taken into consideration. Fifthly the cosmetic culture of "total fashion" was taken into consideration. fifthly the make up of Korean and that of western countries are not only a way to express of aesthetic desire for beauty but sanitary management and it is a kind of an expansion of value for management for an inner self. Now is the time to refuse the attitude of accommodation of the western cosmetic culture without any consideration. We need to rediscover our traditional cosmetic culture and cultural distinctiveness and try to mix them with the western cosmetic culture in order to develop our own peculiar style which will be able to Korean design remain in the international stage and grow further.d grow further.

• Journal of the Korean Professional Engineers Association
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• v.34 no.1
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• pp.53-58
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• 2001

Value Engineering (VE) is an organized process with an impressive history of improving value and quality. VE can be applied to the construction projects with having good study results. The VE study in construction projects gives identification of opportunities to remove unnecessary costs while assuring quality, performance, reliability, and other factors will meet or exceed the clients needs. VE techniques can save money, reduce time, and improve quality, reliability, maintainability, and performance. VE can also make improving of human factors (altitudes, creativity), and team work. According to the results of VE study in recent USA, 5∼35% reduction in initial costs have been made for the construction projects (ROI ranges : 100∼1000). To have successful work results, if possible, VE study shall be considered at project planning stage or basic design stage later than field work stage with application of VE JOB PLAN, multi-disciplinary approach, and proper techniques in respective study phases (pre-workshop / information gathering / function analysis / creativity / judgement and evaluation / development / presentation and implementation) among the detail techniques in many.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.135-136
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• 2016

SUPER concrete poontoon is developed to overcome shortcomings about corrosion problem of steel pontoon and the insufficient freeboard line of concrete pontoon. Top slab of Pontoon resists truck load or sidewalk live load. The soffit slab and outer wall of Pontoon resist the horizontal and vertical components of wave pressure, and those were loaded along X and Y-axis of Pontoon. Global analysis for the Pontoon is carried out to design its cross-sections economically using a geometric non-linear time history analysis method by Strand7 and buoyance-stability calculated automatically on non-vertical boundary conditions. And the load-capacity of Pontoon is confirmed through mock-up tests.

• Journal of the Korean Society of Costume
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• v.18
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• pp.247-268
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• 1992

The Clothing expresses people's desire of beauty most directly of all cultural inheritances, and it teach us how the human culture has changed and developed. In this study researched the history of buttonholes which make the clothes more functional and beautiful. Buttons and Buttonholes is one of detailed elements they used as a fastener or as a decoration on clothing. Button have been used since ancient times, in early times long before buttons were used as fasteners they had significant decorative and symbolic value. In ancient times, clothes fastened with pins, brooches, fibular and ties. In medieval Europe, it was not until the 13th century that they used the button in functional use, and then Chong Ryung-Lk was introduced from orient, and they became popular as fasteners on clothing during the 13th century when fitted clothes replaced loose garments. Garments were laced together or fastened with buttons, until buttonholes were invented in the 13th century. But as early as the 14th century it appears that someone discovered that a loop slipped over a button, or button pushed through a slit in the cloth, would make a good clothes fastener. Many buttons made during the modern ages were convex medallions set in metal rims and decorated with partraits of famous men and women. During the modern ages, buttons, with ligh-ographed pictures, covered with celluloid of glass were popular. In the 19th century, the mass production by machine made people use the button easily, and many different material of button easily and many different material of button was made. With the begining of the 20th century. the development of plastics led to various and functional buttons. The type of buttonholes also became various, as bound buttonhole, Tailred buttonhole, Worked buttonhole, Loop buttonhole and so on. The button has many forms which were imitated by nature, or made geometrically and the appearance of the button from behind is classified by what has holes and what has holes and what has a shank, and I also classified the kinds of button by the quality of the material design and use. Like this, with the passing of the time buttons and buttonholes have changed in appearance with the change of clothes, and they have standed for something meaningful as well as fixed the opening and made clothes more beautiful.

• Journal of Korean Society of Coastal and Ocean Engineers
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• v.26 no.1
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• pp.33-40
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• 2014

Reliability analysis of jacket type offshore wind turbine (OWT) support structure under extreme ocean environmental loads was performed. Limit state function (LSF) of OWF support structure is defined by using structural dynamic response at mud-line. Then, the dynamic response is expressed as the static response multiplied by dynamic response factor (DRF). Probabilistic distribution of DRF is found from response time history under design significant wave load. Band limited beta distribution is used for internal friction angle of ground soil. Wind load is obtained in the form of thrust force from commercial code called GH_Bladed and then, applied to tower hub as random load. In a numerical example, the response surface method (RSM) is used to express LSF of jacket type support structure for 5MW OWF. Reliability index is found using first order reliability method (FORM).