• 한국수학교육학회지시리즈D:수학교육연구
• /
• 제3권1호
• /
• pp.9-21
• /
• 1999

In mid 1980s, open education arrived in Korea. It was influenced by the educational reforms implemented in American primary schools. Currently, the Ministry of Education is appealing to teachers for their active involvement in educational reform by using open education methodology. Often teachers in Korea complain that they do not know what to do or how to change in order to practice the open education. It is time to review the state of open education in Korea and the United States. This paper contains the following segments: 0) Introduction, 1) Beginning of open education, 2) A brief history of open education in Korea, 3) The current status of open education in the United States, 4) A glance at open mathematics classroom in Korea, 5) Lessons from the review, and 6) Conclusion.

• 지식경영연구
• /
• 제11권4호
• /
• pp.1-19
• /
• 2010

With the increasing importance of ecosystem in a business environment, the value of open innovation is receiving great attention. Under open innovation, companies open their knowledge, capital, and other resources to cooperating companies; on the other hand, under closed innovation companies depend solely on their own resources. In this paper, we compare closed and open innovation using the simulation method, and confirm that in terms of total capital and production of the industry, open innovation provides greater opportunities to the entire ecosystem. Moreover, Schumpeterian competition, which is a dynamic of closed innovation, functions even under open innovation. Our findings highlight that not only small but also large companies can receive the benefit of an enlarged industry under open innovation.

• Asian Journal of Innovation and Policy
• /
• 제10권3호
• /
• pp.316-329
• /
• 2021

This study explores the role of the think tank as an intermediary organization in the open innovation system. Think tank has contributed to the policy process as a mediator between government and public and as a symbolic entity of intellectual innovation to produce knowledge to the public. As the innovation system matures, one of the major challenges in research and practice is the openness and collaboration in the science, technology, and innovation system. While previous literature highlighted the think tank as the knowledge arbitrager transforming ideas into policy issues, few studies address the research questions: Is the conventional role of the think tank still persistent in the open innovation system? What are the demanding roles? This paper tackles these questions by reviewing the current role of the South Korean think tank in the science & technology sector. Based on the open innovation framework, we suggest that think tanks need to play a bigger role as policy entrepreneurs, crossing policy borders and interacting with other partners.

• Biomolecules & Therapeutics
• /
• 제24권1호
• /
• pp.99-107
• /
• 2016

Triclosan is an antimicrobial or sanitizing agent used in personal care and household products such as toothpaste, soaps, mouthwashes and kitchen utensils. There are increasing evidence of the potentially harmful effects of triclosan in many systemic and cellular processes of the body. In this study, we investigated the effects of triclosan in the survivability of cultured rat neural stem cells (NSCs). Cortical cells from embryonic day 14 rat embryos were isolated and cultured in vitro. After stabilizing the culture, triclosan was introduced to the cells with concentrations ranging from $1{\mu}M$ to $50{\mu}M$ and in varied time periods. Thereafter, cell viability parameters were measured using MTT assay and PI staining. TCS decreased the cell viability of treated NSC in a concentration-dependent manner along with increased expressions of apoptotic markers, cleaved caspase-3 and Bax, while reduced expression of Bcl2. To explore the mechanisms underlying the effects of TCS in NSC, we measured the activation of MAPKs and intracellular ROS. TCS at $50{\mu}M$ induced the activations of both p38 and JNK, which may adversely affect cell survival. In contrast, the activities of ERK, Akt and PI3K, which are positively correlated with cell survival, were inhibited. Moreover, TCS at this concentration augmented the ROS generation in treated NSC and depleted the glutathione activity. Taken together, these results suggest that TCS can induce neurodegenerative effects in developing rat brains through mechanisms involving ROS activation and apoptosis initiation.

• 한국입자에어로졸학회지
• /
• 제9권2호
• /
• pp.103-110
• /
• 2013

The electrostatic precipitator (ESP) has been used for degrading atmospheric pollutants. These devices induce the electrical forces to facilitate the removal of particulate pollutants. The ions travel from the high voltage electrode to the grounded electrode by Coulomb force induced by the electric field when a high voltage is applied between two electrodes. The ions collide with gas molecules and exchange momentum with each other thus inducing fluid motion, electrohydrodynamic (EHD) flow. In this study, for the simulation of electric field and EHD flow in ESPs, an open source EHD solver, "espFoam", has been developed using open source CFD toolbox, OpenFOAM(R) (Open Field Operation and Manipulation). The electric potential distribution and ionic space charge density distribution were obtained with the developed solver, and validated with experimental results in the literature. The comparison results showed good agreement. Turbulence model is also incorporated to simulate turbulent flow; hence the developed solver can analyze laminar and turbulent flow. In distributions of electric potential and space charge, the distributions become distorted and asymmetric as the flow velocity increases. The effect of electrical drift flow was investigated for different flow velocities and the secondary flow in a flow of low velocity is successfully predicted.

• 한국약용작물학회지
• /
• 제28권4호
• /
• pp.254-259
• /
• 2020

Background: Centella asiatica is a well-known medicinal plant having a wound healing effect. In this study, the growth, asiaticoside content, and antioxidant components and activity were investigated in C. asiatica resources under different cultivation and irrigation conditions. Methods and Results: The cultivation and irrigation methods were divided as greenhouse and open field, and sprinkler and sub irrigation. respectively. Growth characteristics were measured in aerial parts of C. asiatica. Asiaticoside content was analyzed using high performance liquid chromatography. Total polyphenol, total flavonoid and 2,2-diphenyl-1picryl hydrazyl (DPPH) radical scavenging activity were analyzed for antioxidant activities. Growth was higher under greenhouse and sub irrigation than open field and sprinkler conditions. In the leaves, asiaticoside content was 53.45 mg/g (open field) and 34.38 mg/g (sub irrigation), total polyphenol was 41.14 mg/g (open field) and 25.73 mg/g (sub-irrigation), and total flavonoid was 27.26 mg/g (open field) and 23.72 mg/g (sub-irrigation). DPPH radical scavenging activity in the leaves was 85.97 mg·ascorbic acid equivalent (AAE)/g (open field) and 54.83 mg·AAE/g (sub irrigation). Conclusions: Asiaticoside and antioxidant components and activity were not accompanied with high yield, although high growth was observed under greenhouse conditions. Therefore, cultural requirements of C. asiatica should be sufficiently considered to suit each purpose.

• Spatial Information Research
• /
• 제22권6호
• /
• pp.67-79
• /
• 2014

최근 전 세계적으로 많은 국가에서 오픈소스 소프트웨어의 도입 및 활용이 크게 늘고 있다. 특히 오픈소스 소프트웨어의 활성화를 위해 정부와 민간 기업이 적극적으로 나서고 있는 추세이다. 본 논문에서는 오픈소스 공간정보 소프트웨어 생태계 활성화정도를 확인하고, 생태계 활성화를 위한 시사점을 도출해 보고자 하였다. 오픈소스 공간정보 소프트웨어 생태계의 주요 역할자는 정부, 기업, 학계 및 연구계, 비영리재단 등이다. 정부는 오픈소스 공간정보 소프트웨어에 대한 R&D 투자나 지원에 대한 정책을 갖고 있지 않은 것으로 나타났다. 오픈소스 공간정보 소프트웨어 관련기업은 그 숫적인 측면에서도 작을 뿐만 아니라 수익을 창출하는 명확한 비즈니스 모델을 갖고 있지 않았다. 학계 및 연구계는 오픈소스 공간정보 소프트웨어의 활용이 매우 낮으며, 이는 생태계 내에 핵심인력을 제공하는데 부정적 영향을 미치는 것으로 판단되었다. 비영리재단은 2009년 설립된 OSGeo 한국어지부가 다양한 노력을 기울이고 있지만 질적인 측면에서나 활성화 측면에서는 아직 미약한 수준이다. 오픈소스 공간정보 소프트웨어 생태계의 활성화를 위해서는 참여하는 각 주체별 노력이 필요하다. 그 가운데에서도 정부는 이 생태계의 활성화에 가장 큰 시발점을 제공할 수 있을 것으로 판단된다. 정부에서 추진되어야 할 과제와 관련하여 첫째, 오픈소스 공간정보 소프트웨어에 대한 R&D투자 둘째, 공공부문에 오픈소스 공간정보 소프트웨어를 활용한 시범구축사업, 셋째, 관련 인력양성, 넷째, 오픈소스 공간정보 소프트웨어와 관련된 국제협력, 홍보마케팅과 관련된 노력 등이 지속적으로 필요한 것으로 판단된다.

• 한국콘텐츠학회논문지
• /
• 제9권2호
• /
• pp.350-358
• /
• 2009

전 세계적으로 항공자유화가 급격히 확산되면서 우리나라도 항공정책의 기본방향을 항공자유화로 수립하고 시장 개방을 통해 국적항공사의 경쟁력 제고 및 이용자 편의 증진을 도모하고 있다. 이러한 항공자유화의 방향은 정부, 항공사, 공항, 이용자 등 다양한 요소가 유기적으로 연계되어 고려되어야 하며, 정책실행의 강도에 따른 효과를 다양하게 실험해 봄으로써 내실 있는 방향으로 수립되어야 할 것이다. 본 연구에서는 시스템 사고를 기본적 틀로 하고 있는 시스템 다이나믹스(System Dynamics) 기법을 사용하여 항공자유화의 동태적 특성을 분석하기 위한 시뮬레이션 모델을 개발하고, 동 모델 상에서 항공자유화 정책의 시나리오에 따른 효과를 분석하였다. 분석 결과, 항공자유화는 운항횟수 증대, 항공운임 인하 등의 소비자 편익 제고뿐만 아니라 항공사, 공항 등 항공운송산업 및 지역경제에 긍정적인 영향을 미치는 것으로 나타났다. 따라서 항공자유화의 효과를 극대화시킬 수 있도록 정책적 실행 강도를 적절히 구사해야 할 것이다.

• 한국멀티미디어학회논문지
• /
• 제19권2호
• /
• pp.170-179
• /
• 2016

It is a story-based content creation service that provides any user with some proper contents based on a story written by the user in order to utilize a lot of contents accumulated on Internet. For this service, the story has to be described in computer-readable representation. In this paper, analyzing the structure of scenario, as known as screenplay or scripts, a structure of story representation, which is referred to as OpenScenario, is defined. We intend users to produce their own contents by using massive contents on Internet by the proposed method. The proposed method's OpenScenario consists two main parts, OSD (OpenScenario Descriptors) which is a set of descriptors to describe various objects of shots such as visual, aural and textual objects and OSS (OpenScenario Scripts) which is a set of scripts to add some effects such as image, caption, transition between shots, and background music. As an usecase of proposed method, we describe how to create new content using OpenScenario and discuss some required technologies to apply the proposed method effectively.

• ETRI Journal
• /
• 제41권4호
• /
• pp.473-482
• /
• 2019

High availability and reliability have been considered promising requirements for the support of seamless network services such as real-time video streaming, gaming, and virtual and augmented reality. Increased availability can be achieved within a local area network with the use of the virtual router redundancy protocol that utilizes backup routers to provide a backup path in the case of a master router failure. However, the network may still lose a large number of packets during a failover owing to a late failure detections and lazy responses. To achieve an efficient failover, we propose the implementation of fast detection with virtual router redundancy protocol (FDVRRP) in which the backup router quickly detects a link failure and immediately serves as the master router. We implemented the FDVRRP using open neutralized network operating system (OpenN2OS), which is an open-source-based network operating system. Based on the failover performance test of OpenN2OS, we verified that the FDVRRP exhibits a very fast failure detection and a failover with low-overhead packets.