• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 한국항해항만학회 2006년도 춘계학술대회 및 창립 30주년 심포지엄(논문집)
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• pp.209-214
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• 2006

This paper desires to assist ensuring of propriety clean-up equipment for clean-up shore or sea of pollution, there is not that responsible ability of a nation has an amount of skimmer or the length of boom. responsible ability of a nation must express overall evaluation what is considering quickly, system, and economizing in addition to an amount or clean-up equipment. responsible ability of a nation is complication and it's mutual relation of each other factor therefore responsible capacity of a nation is expressed using powersim with system dynamics theory.

• The Journal of the Korea institute of electronic communication sciences
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• 제16권3호
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• pp.511-518
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• 2021

In order to obtain a good tracking performance of the motor, it is necessary to design a controller that can respond to a disturbance by including a disturbance observer. The disturbance observer of the motor is designed to estimate the load torque and the back electromotive voltage based on the first-order low-pass filter. A PI controller and an IP controller were designed to compare the correlation between the disturbance observer and the controller and to obtain improved control performance. To check the performance of the designed observer and the controller, it was applied to a 120 [W] class BLDC motor. As a result, overshoot is reduced, and it can be seen that the steady-state error converges to zero.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2020년도 학술발표회
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• pp.311-311
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• 2020

가뭄·홍수 등 수재해 대응대책 수립 측면에서 유역의 자연유출량 산정은 가장 핵심적인 사항이라 할 수 있다. 우리나라는 전국적으로 수위-유량관측소를 설치하여 실시간 유출량 모니터링을 통해 수문정보를 수집하며, 주요지점을 제외한 유역에서는 주기적으로 강우-유출모형의 매개변수 최적화를 통해 산정된 장기유출량 결과를 자연유출으로 가정하여 수자원 계획 수립시 활용하고 있다. 그러나 강우-유출모형의 최적 매개변수 추정을 위해 활용되는 관측 수문자료는 상대적으로 자료의 연한이 짧고, 계절·공간적인 특성으로 인해 매우 제한적이며, 유역의 특성을 충분히 고려하지 못해 미계측유역의 매개변수 추정시 모형의 자료에서 기인한 불확실성이 크게 발생한다는 단점이 있다. 이에 본 연구에서는 관측자료에 대한 신뢰성이 유의하며, 공간적으로 고르게 분포된 12개 댐 유역을 대상으로 매개변수 지역화 연구를 수행하였다. SCEM-UA기법을 통해 GR4J 강우-유출모형의 매개변수를 최적화 하였으며, 매개변수와의 상관관계 및 선형회귀분석을 통해 유역특성인자를 선별하여 Copula 함수를 통해 지역화된 매개변수를 추정하였다. 최종적으로 본 연구에서 제시된 방법론에 대한 적합성을 평가하기 위하여 매개변수 최적화가 수행된 유역을 미계측 유역으로 가정하여 교차검증 관점에서 적합성을 검토하였으며, 통계적으로 유의한 결과가 도출되는 것을 확인하였다.

• Informatization Policy
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• 제18권4호
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• pp.3-21
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• 2011

Knowledge ecosystem means a dynamic knowledge circulation, including knowledge creation, exchange and sharing and utilization. It is also the field of knowledge practice, which creates interactions in knowledge exchange between people and groups. The key premises of knowledge ecosystem, based on the nature of general ecosystems, can be characterized as follows: first, it primarily focuses on social networks between people and organizations participating in the process of knowledge circulation; secondly, knowledge ecosystem thrives on diversity of knowledge; and thirdly, it is significant for selection of valuable knowledge and adoption of appropriate knowledge. This review attempts to make a systematic examination of a wide range of existing studies on knowledge ecosystem. In so doing, it is expected to provide a basis for further inquiry into more critical and complicated issues. Although the scarcity of existing research-at least those in Korea-may limit the implications of findings, this review offers a set of suggestions for future research.

• Review of Culture and Economy
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• 제21권1호
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• pp.63-83
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• 2018

In the US, there are no governing bodies within the federal executive departments dedicated to the arts and cultural affairs. Direct government subsidies for the arts are relatively small compared to other countries with a comparable economy and standard of living. Nevertheless, the US produces artworks, artists, and arts groups, leading the world's arts and culture. Incorporating the concepts of network governance and shared governance, this paper examines the dynamic roles and interrelationships among various for-profit/nonprofit arts organizations, foundations, councils, service organizations, arts advocacy groups, and professional/amateur associations from the federal to local levels that compose the ecology of American arts and culture. Through our evaluation, we conclude that the local/state/federal arts agencies and arts organizations at various levels influence each other via the principle of subsidiarity and isomorphism, creating a unique cultural policy and arts-supporting system that correspond to the political and social structure and environment of the United States.

• 지역과문화
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• 제8권1호
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• pp.25-53
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• 2021

Based on the assumption that understandings and practices have been shifted in accordance with the historical context, this study aims to propose future policies to localize cultural diversity. First, in this study, it is necessary for the concept of cultural diversity, which came from political struggles, to understand and practice cultural diversity in the historical context by analyzing the multilayer aspects of policy practices. Second, through the case study of Jeonlabuk-do, by reviewing the discrimination experienced by social minorities and the perception of professionals related to culture policies in the region, this study represents to understand and practice of cultural diversity in the multi-layed way, even in the local. Lastly, it suggests some specific future policies to be considered when implicating the policies of culture diversity in respond to the limits of current government policies, including: decentralization of policies, enhancing local policies, transition from 'politics of distribution' to 'politics of recognition', an interculturalist approach that promotes contact rather than separation

• Journal of the Korea Society for Simulation
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• 제19권4호
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• pp.169-178
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• 2010

Agent based simulation is an approach for the analysis of a system's long term behavior where the entities in the system behave independently by their own judgement and memory, but influence each other to cope with given environment. In this paper we developed an agent based simulation model for the analysis of behavioral mechanism of team formation. In the process of team formation members' mutual preference is an important factor although each member can join up with one's own will. Also a team performance can vary by the member's own experience. We implemented the developed model using Netlogo 4.1, and verified the model by simulation. From the simulation results we found that the model successfully performed necessary functions using behavioral rules, judgments, and evolutionary processes by memory. As a further study we will be able to apply the model for analyzing various ecological behavior of team formation.

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2021년도 학술발표회
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• pp.269-269
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• 2021

최근 기후변화로 인하여 과거 대비 강수패턴의 변화로 연중 총 강수량은 증가하였으나, 강우일수의 감소, 강우강도의 증가, 연속 무강우일수의 증가 등(기상청, 2018) 유역 내 수문환경 변동이 나타났고, 이로 인한 유역 내 연중 일정한 수자원 확보 및 안정적인 관리 측면에서 문제점들이 발생하고 있다. 2012~2017년 동안은 강수량 감소로 인한 전국적인 가뭄이 기록되었고, 최근 2020년에는 우리나라 뿐만 아니라 일본, 중국 등을 포함한 동아시아 지역에는 장기간의 폭우 발생으로 인한 기록적인 홍수 피해가 발생하였다. 기후변화를 피할 수 없는 현 상황에서(IPCC, 2013) 장래에 홍수·가뭄과 같은 수재해의 빈도가 증가하고, 강도가 심화될 것으로 예측되는 가운데 수재해에 대응·대비가 가능하고, 지속적이고 안정적인 수자원 확보가 가능할 수 있도록 수량과 수질을 모두 고려한 유역 단위의 수자원 관리 방안 마련에 대한 사회적 요구가 높아지고 있다. 이에 본 연구에서는 인구가 밀집되어 있는 수도권의 하천 유역 중 산지, 농지, 도농복합지 등 다양한 유역의 공간적인 특성이 혼합된 경안천 중유역을 대상으로 소유역 별 지하수자원 관리 취약성 평가 연구를 수행하였다. 기존의 연구에서는 지하수자원 관리 취약성 평가 시 강수에 따른 지하수위의 증감 여부, 사회적 인자로 인구, 수자원 이용량 중 지하수 이용량 등의 인자를 선정하여 지하수자원 관리의 취약성을 평가하였다. 최근 삶의 질 향상에 따라 안정적인 수량 확보와 유역 생태 보전을 위한 수질 안정성을 함께 확보 할 수 있는 다양한 연구들이 진행되고 있다. 기존 연구의 발전 및 기존 연구와의 차별성을 위하여 본 연구는 강수-하천수-지하수와 같은 수문순환 요소와 하천 수질 관측 요소 간의 상관관계 규명을 통한 유역 내 수문-수질 요소 간 상호영향을 고려하고, 안정적이고 지속가능한 수자원 관리를 위하여 지하수자원 관리 취약성 평가를 수행함으로써 수문순환과 수질을 모두 고려한 새로운 방법의 지하수자원 관리 취약성 평가 연구를 수행하였다. 본 연구의 결과는 유역 내 수문순환 요소와 함께 유역 내 수질관측 인자 간의 상호영향을 고려한 차세대 수자원 관리 방안 마련의 과학적·정책적 근거가 될 것으로 기대하고 있으며, 이를 통한 대국민 물 복지 실현에 기여할 수 있을 것으로 기대된다.

• 한국사회정책
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• 제25권2호
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• pp.429-446
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• 2018

The $4^{th}$ Industrial Revolution, symbolizing the explosive innovation of digital technologies, is expected to have a great impact on labor relations and produce a lot of contested issues. The labor-management issues, created by the $4^{th}$ Industrial Revolution, are as follows: (1) employment restructuring, job re-allocation, and skill-reformation, driven by the technological displacement, resetting of worker-machine relationship, and negotiation on labor intensity and autonomy, (2) the legislation of institutional protection for the digital dependent self-employed, derived from the proliferation of platform-mediated labor, and the statutory recognition of their 'workerness', (3) unemployment safety net, income guarantee, and skill formation assistance for precarious workeforce, (4) the protection of worker privacy from workplace surveillance, (5) protecting labor rights of the digital dependent self-employed and prcarious workers and guaranteeing their unionization and collective bargaining. In comparing how labor unions in Western countries have responded to the $4^{th}$ Industrial Revolution, German unions have showed a strategic approach of policy formation toward digital technological innovations by effectively building and utilizing diverse channel of social dialogue and collective bargaining, while those in the US and UK have adopted the traditional approach of organizing and protesting in attempting to protect the interest of platform-mediated workers (i.e. Uber drivers). In light of the best practice demonstrated by German unions, it is necessary to build the process of productive policy consultation among three parties- the government, employers, and labor unions - at multi levels (i.e. workplace, sectoral and national levels), in order to prevent the destructive damage as well as labor-management confrotation, caused by digital technological innovations. In such policy consultation procesess, moreover, the inclusive and integrated approach is required to tackle with diverse problems, derived from the $4^{th}$ Industrial Revolution, in a holistic manner.

• Journal of Korean Library and Information Science Society
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• 제43권1호
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• pp.261-285
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• 2012

The purpose of this study is to confirm that the user benefit criteria can be applied as the user benefit criteria of children's libraries by examining the theoretical validity of the user benefit criteria and furthermore, by clarifying and verifying the mutual relation between the user benefit criteria and the child development area. For such a purpose, this study collected data from 247 users of children's libraries in the country and collected data was analyzed using the structural equation modeling. The result of analysis is as follows. First, the relation between physical development and behavioral facilitation, emotional development and physiological maintenance, cognitive development and perceptual maintenance, and the development of social skills and social facilitation was appropriate. Second, usability, safety and diversity was valid as an index of behavioral facilitation, self-esteem, amenity and peacefulness was valid as an index of physiological maintenance, esthetic sense, dynamics and flexibility was valid as an index of perceptual maintenance, and leisure, communication and territoriality was valid as an index of social facilitation. Third, children who prefer physical development prefer the benefit of behavioral facilitation, children who prefer emotional development prefer the benefit of physiological maintenance, children who prefer cognitive development prefer the benefit of perceptual maintenance and children who prefer the development of social skills prefer the benefit of social facilitation.