• Journal of Korea Water Resources Association
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• v.46 no.4
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• pp.373-387
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• 2013

For the efficient operation and management of the water resources system, coordinated operation of weirs and reservoirs is required. A simulation based, and an optimization based approaches are available to deal with the operation and management problems. The simulation based approach does not guarantee an optimal solution, and the optimization based approach is not so flexible to consider, complex, nonlinear problems we will face when trying to allocate water to different uses, various demand sectors in a basin. Hence, it is important to develop a model that would compensate for the weak points in both models. We will compare and contrast intrinsic and extrinsic properties of two modeling approaches, addressing issues related to setting system operation and control rules that would lead us to more efficient use of water in the basin. As a result, we propose to use CoWMOM(Coordinated weirs and multi-reservoir operating model), a "simulation based" optimization model for a simple simulation of the past periods, and for the real-time simulation process considering uncertain inflow.

• Journal of the Economic Geographical Society of Korea
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• v.16 no.4
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• pp.597-612
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• 2013

The purpose of this paper is to examine the building process of industrial competitiveness of the Korean cosmetics industry in the global production network. For this study, cosmetics industry in Korea is selected as a research subject. Secondary data and the Korea Health Industry Statistics are analyzed to examine the overall changes of the cosmetics firms under the changes of global economy overtime. In-depth interviews of the case firms are also conducted to understand the old and new corporate strategies which locate with the sustainability and competitive advantages under an uncertain environment. As a result of the restructuring processes, the Korea cosmetics industry has upgraded its position as an innovative power in the world cosmetics industry. In addition, during the restructuring processes, cosmetics industry is overwhelmingly concentrated in the Capital Region, reflecting intensification of agglomeration economies.

• Journal of Physiology & Pathology in Korean Medicine
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• v.21 no.4
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• pp.803-814
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• 2007

Shenming(神明) exists everywhere in the universe; it affects human beings to feel and contact ideal and peaceful state of Shen(神). Shenming theory(神明思想) in ${\ulcorner}$Hwang Ti Nei Ching${\lrcorner}$ (黃帝內經) was established by ancient Northeastern Asians who were trying to apply paradigm called TianRenHeYi theory(天人合-思想), unifying man and the Great Spirit(絶對精神) of the universe. Based on present, Shenming(神明) is an idea that can estimate will of Shen(神) which has a key to the future; such concept is founded by both human's mind and action that are designed to seek for the uncertain future. Very pure and devoted mind can sympathize with Shen(神) to accept Shenming(神明). Sehnming theory(神明思想) in ${\ulcorner}$Hwang Ti Nei Ching${\lrcorner}$ (黃帝內經) has a basic concept of living balanced life as a human by accepting Shenming(神明), the Spirit of Universe. Thus, it can be summarized into a phrase, 'Shenming(神明) is a process that human conjures his ultimate destiny called the Great Spirit(絶對精神) in himself.' If a man would be guided by Shenming(神明), the Spirit of Universe, he can live peacefully. Therefore, it is essential to study Shenming theory(神明思想) in ${\ulcorner}$Hwang Ti Nei Ching${\lrcorner}$ (黃帝內經) to aid present people's mental health.

• Korean Institute of Interior Design Journal
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• v.18 no.6
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• pp.96-103
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• 2009

Man has an unconscious desire to free oneself from everyday selves and a strong intellectual desire to see and analyze things in a different perspective. This provided a momentum for architectural design that has long been confined to its limits of modernism of being rational and objective. The ever-changing society that we live in filled with various attempts and pluralistic characteristics shows a complex set of attributes that can hardly be defined by a single term. As society moves towards an uncertain and volatile state, the boundary between literature, philosophy and art has dimmed out and converged. Such tendencies have been observable in recent establishments in architecture in the form of introducing external elements and create an alien and farfetched architectural space. Using the 'depaysement' defamiliarization method expressing irrationality and randomness, it is applied in various aspects, sharing the counter-rational structure and features of such architectural space. Hence, it is the purpose of this study to delve into the unique characteristics of depaysement through Magritte's work which reflects the unique pictorial world built under the influence of surrealism, and discover the $D\acute{e}paysement$ tendencies in modern architectural space. It is apparent in Modern architecture that, owing to the development in digital technology, it is showing process changes in design and an interfacial $D\acute{e}paysement$ effect in cyberspace, an interlace of reality and the virtual world. In this study, the focus of analysis was architectural properties such as the program, figure/spatial, material and the objective side, but due to mutual text properties, it is bound to be an overlapping analysis.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.11 no.5
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• pp.543-549
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• 2018

The importance of prediction is becoming more emphasized, due to the uncertain business environment. In order to implement the predictive model, a number of data engineers and scientists are involved in the project and various prediction ideas are suggested to enhance the model. it takes a long time to validate the model's accuracy. Also It's hard to redesign and develop the code. In this study, development method such as Lego is suggested to find the most efficient idea to integrate various prediction methodologies into one model. This development methodology is possible by setting the same data layout for the development code for each idea. Therefore, it can be validated by each idea and it is easy to add and delete ideas as it is developed in Lego form, which can shorten the entire development process time. Finally, result of test is shown to confirm whether the proposed method is easy to add and delete ideas.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.10
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• pp.6092-6101
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• 2014

This study examined the job experience of visiting supervisors for multicultural families. To achieve the goal of this study, data was collected by in-depth interviews with 7 visiting supervisors for multicultural families. For an analysis of the data, the grounded theory approach by Strauss and Corbin [11] was employed. The results of an analysis of the categories are detailed below. Through an open coding process, a total of 124 concepts, 33 subcategories, and 13 categories were produced. The central phenomenon was 'uncertain employment '. From the axial coding, the causal conditions were 'employment for economic reasons' and 'frequent policy and regulation changes'. The contextual conditions were 'uneasiness about the evaluation result', 'unilateral work instruction system', and 'little improvement of treatment'. Intervention conditions were 'high level of satisfaction with work', 'handy source of income', and 'no other alternative'. Action/interaction strategies were 'efforts for contract extension' and 'receptive attitude'. The consequences were 'hope to retain employment' and 'agonizing over their rights'.

• Journal of Information Management
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• v.43 no.2
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• pp.169-197
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• 2012

Patents are an up-to-date and reliable source of technological knowledge, and thus patent analysis has been considered to be a necessary step for identifying evolving technological trends and planning technology strategies. Although there exist many research papers and technical reports concerning patent analysis, few empirical studies on planning technology strategies for uncertain futures from a national or company perspective have been rarely conducted. Therefore, this paper aims presenting a procedure and its practical case of planning future technology strategies by incorporating patent analysis and scenario planning. Using patents related to polymer electrolyte membrane fuel cells, this paper developed technology strategies corresponding to future scenarios. We expect that the proposed method and case study can assist knowledge services of experts in the long-term technology strategy planning process.

• Structural Engineering and Mechanics
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• v.51 no.4
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• pp.547-564
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• 2014

This study focuses on the application of an active tuned mass damper (ATMD) for controlling the seismic response of an 11-story building. The control action is achieved by combination of a fuzzy logic controller (FLC) and Particle Swarm Optimization (PSO) method. FLC is used to handle the uncertain and nonlinear phenomena while PSO is used for optimization of FLC parameters. The FLC system optimized by PSO is called PSFLC. The optimization process of the FLC system has been performed for an 11-story building under the earthquake excitations recommended by International Association of Structural Control (IASC) committee. Minimization of the top floor displacement has been used as the optimization criteria. The results obtained by the PSFLC method are compared with those obtained from ATMD with GFLC system which is proposed by Pourzeynali et al. and non-optimum FLC system. Based on the parameters obtained from PSFLC system, a global controller as PSFLCG is introduced. Performance of the designed PSFLCG has been checked for different disturbances of far-field and near-field ground motions. It is found that the ATMD system, driven by FLC with the help of PSO significantly reduces the peak displacement of the example building. The results show that the PSFLCG decreases the peak displacement of the top floor by about 10%-30% more than that of the FLC system. To show the efficiency and superiority of the adopted optimization method (PSO), a comparison is also made between PSO and GA algorithms in terms of success rate and computational processing time. GA is used by Pourzeynali et al for optimization of the similar system.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.38 no.4
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• pp.39-44
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• 2015

The VHTR (Very High Temperature gas-cooled nuclear Reactor) has been considered as a major heat source and the most safe generation IV type reactor for mass hydrogen production to prepare for the hydrogen economy era. The VHTR satisfies goals for the GIF (Generation IV International Forum) policy such as sustainablility, economics, reliability and proliferation resistance and physical protection, and safety. As a part of a VHTR economic analysis, we have studied the VHTR construction cost and operation and maintenance cost. However, it is somewhat difficult to expect the ripple effect on the whole industry due to the lack of information about Inter-industries relationship. In many case, the ripple effect are based on experts' knowledge or uncertain qualitative assumptions. As a result, we propose quantitative analysis techniques for ripple effects such as the production inducement effect, added value inducement effect, and employment inducement effect for VHTR 600MWt${\times}$4 modules construction and operation ripple effect based on NOAK (Nth Of A Kind). Because inducement effect values have been published annually, we predict inducement effect's relation function and estimated values including production inducement effect value, added value inducement effect value, and employment inducement effect value using time series and estimated values are verified with published inducement effects' value. This paper presents a new method for the ripple effect and preliminary ripple effect consequence using a time series analysis and inter-industry table. This ripple effect analysis techniques can be applied to effect expectation analysis as well as other type reactor's ripple effect analysis including VHTR for process heat.

• Computers and Concrete
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• v.23 no.6
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• pp.433-444
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• 2019

As rice husk ash (RHA) is not produced in controlled manufacturing process like cement, its properties vary significantly even within the same lot. In fact, properties of Rice Husk Ash Based Concrete (RHABC) are largely dictated by uncertainty leading to huge deviations from their expected values. This paper proposes a Robust Cost Optimization (RCO) procedure for RHABC, which minimizes such unwanted deviation due to uncertainty and provides guarantee of achieving desired strength and workability with least possible cost. The RCO simultaneously minimizes cost of RHABC production and its deviation considering feasibility of attaining desired strength and workability in presence of uncertainty. RHA related properties have been modeled as uncertain-but-bounded type as associated probability density function is not available. Metamodeling technique is adopted in this work for generating explicit expressions of constraint functions required for formulation of RCO. In doing so, the Moving Least Squares Method is explored in place of conventional Least Square Method (LSM) to ensure accuracy of the RCO. The efficiency by the proposed MLSM based RCO is validated by experimental studies. The error by the LSM and accuracy by the MLSM predictions are clearly envisaged from the test results. The experimental results show good agreement with the proposed MLSM based RCO predicted mix properties. The present RCO procedure yields RHABC mixes which is almost insensitive to uncertainty (i.e., robust solution) with nominal deviation from experimental mean values. At the same time, desired reliability of satisfying the constraints is achieved with marginal increment in cost.