• 한국과학교육학회지
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• 제24권1호
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• pp.171-182
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• 2004

The purpose of this study is to analyze lesson plans from third to sixth grades of science and to find out teaching strategies in respects of learning functions provided by preservice elementary teachers in education university. On the whole, to control students' learning process preservice teachers used more shared-regulation strategy than strong teacher-regulation one. Teaching activities for regulative learning function were most used in strategy of strong teacher-regulation, and in strategy of shared-regulation those for cognitive learning functions were most used. But teaching activities for affective learning functions were used a little considered in both teaching strategies. In introduction step of instruction, affective and regulative learning functions were more instructed by strong teacher-regulation strategy and cognitive learning functions were more instructed by shared-regulation strategy. The affective, cognitive, and regulative learning functions were largely planned by shared-regulation teaching strategy in development. The regulative learning functions were planned by strong teacher-regulation strategy than by shared-regulation strategy and affective learning functions were considered a little bit in consolidation. There was a tendency that strong teacherregulation strategy was increased in lessons for fifth and sixth grade.

• Educational Technology International
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• 제20권2호
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• pp.223-255
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• 2019

The purpose of this study is to draw implications for designing online tools to support monitoring in collaborative learning. For this purpose, eighteen research papers that explored learner dashboards and group awareness tools were analyzed. The driving questions for this analysis related to the information and outcomes that must be monitored, whose performance they represent, and who monitors the extent of learning. The analytical frameworks used for this study included the following: three modes of co-regulation in terms of who regulates whose learning (self-regulation in collaborative learning, other regulation, and socially shared regulation) and four categories of dashboard information to determine which information is monitored (information about preparation, participation, interaction, and achievements). As a result, five design implications for learner dashboards that support monitoring were posited: a) Monitoring tools for collaborative learning should support multiple targets: the individual learner, peers, and the entire group; b) When supporting personal monitoring, information about the individual and peers should be displayed simultaneously to allow direct comparison; c) Information on collaborative learning achievements should be provided in terms of the content of knowledge acquired rather than test scores; d) In addition to information related to interaction between learners, the interaction between learners and learning materials can also be provided; and e) Presentation of the same information to individuals or groups should be variable.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9557-9565
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• 2014

MiRNAs are endogenous, single stranded ~22-nucleotide non-coding RNAs (ncRNAs) which are transcribed by RNA polymerase II and mediate negative post-transcriptional gene regulation through binding to 3'untranslated regions (UTR), possibly open reading frames (ORFs) or 5'UTRs of target mRNAs. MiRNAs are involved in the normal physiology of eukaryotic cells, so dysregulation may be associated with diseases like cancer, and neurodegenerative, heart and other disorders. Among all cancers, lung cancer, with high incidence and mortality worldwide, is classified into two main groups: non-small cell lung cancer and small cell lung cancer. Recent promising studies suggest that gene expression profiles and miRNA signatures could be a useful step in a noninvasive, low-cost and repeatable screening process of lung cancer. Similarly, every stage of lung development during fetal life is associated with specific miRNAs. Since lung development and lung cancer phenomena share the same physiological, biological and molecular processes like cell proliferation, development and shared mRNA or expression regulation pathways, and according to data adopted from various studies, they may have partially shared miRNA signature. Thus, focusing on lung cancer in relation to lung development in miRNA studies might provide clues for lung cancer diagnosis and prognosis.

• Genomics & Informatics
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• 제12권3호
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• pp.105-113
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• 2014

A subset of mammalian genes differ functionally between two alleles due to genomic imprinting, and seven such genes (Peg3, Usp29, APeg3, Zfp264, Zim1, Zim2, Zim3) are localized within the 500-kb genomic interval of the human and mouse genomes, constituting the Peg3 imprinted domain. This Peg3 domain shares several features with the other imprinted domains, including an evolutionarily conserved domain structure, along with transcriptional co-regulation through shared cis regulatory elements, as well as functional roles in controlling fetal growth rates and maternal-caring behaviors. The Peg3 domain also displays some unique features, including YY1-mediated regulation of transcription and imprinting; conversion and adaptation of several protein-coding members as ncRNA genes during evolution; and its close connection to human cancers through the potential tumor suppressor functions of Peg3 and Usp29. In this review, we summarize and discuss these features of the Peg3 domain.

• 한국주거학회논문집
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• 제19권5호
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• pp.93-102
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• 2008

In Korea, a movement for forming intentional communities is gathering people's interests to improve individualistic living environment, and to create a humanistic lifestyle. However, it is difficult to say if its management is successful or not, because intentional community is just in the experimental stage in Korea. The purpose of this study is to identify actual condition of residents' participation in forming process, shared activities in their daily lives, residents' regulation, common facilities and its management in order to offer basic information for revitalization of intentional communities in Korea. 7 intentional communities including eco-friendly villages, religious communities and a cooperative housing community were collected as the study objects. Upon analysis, those communities were divided into two groups according to their purpose of establishment; "HC (Housing-life focused Community includes cooperative housing community and eco-friendly community)" and "IC (Ideology focused Community includes ideology community and religious community)" in order to identify difference in residents' participation between the two groups. In-dept interviews with representatives of 7 intentional communities by a structured questionnaire were used as study method. The findings of this study are as follows; In general, more active residents' participation is identified in ICs than in HCs. There is no common house, which is considered as essential in intentional community, in HCs, while it was facilitated in all ICs. Role of leader seems more important in ICs than in HCs. About the ownership of housing and land, private owned is common in HCs, while community owned is common in ICs. Shared activities and residents' regulations are evidently less in most HCs than in ICs. Furthermore, in order to run a community sustainable, it is crucial to encourage sense of community among residents, and developing common house and activity programs. Common house design, which can promote proactive residents' participation in shared activity should be studied fitted to Korean circumstances. Above all, proactive participation in the shared activities is one of the most important factors in intentional community.

• 전자공학회논문지
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• 제50권1호
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• pp.148-156
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• 2013

본 논문에서는 디지털 제어부를 공유하며, 회로 동작시간의 분배 방식을 통해 다중 출력을 지원하는 SMPS를 제안한다. 제안된 회로는 Pseudo Relaxation Oscillating 기법의 DPWM 발생기를 사용한다. 제안된 SMPS는 회로의 동작시간 분배 방식을 사용하여 기존의 DPWM 발생기에서 문제가 되는 큰 면적의 디지털 로직 컨트롤러를 공유하는 형태이기 때문에 칩 면적과 효율 측면에서 큰 이점을 가지지만, 각 DPWM 발생기의 실시간 제어가 어려우며 불안정한 출력 전압을 공급할 수 있다는 단점을 가진다. 이를 해결하기 위해 본 논문에서는 동작시간 분배 방식으로 인해 동작클록이 인가되지 않은 DPWM 발생기들의 출력전압을 실시간으로 피드백 받아 안정된 출력 전압을 공급할 수 있는 실시간 전류 보정 기법을 제안한다. 제안된 SMPS를 100MHz의 내부 제어 동작 주파수와 10MHz 스위칭 주파수로 동작시킬 시, 소모되는 내부 코어 회로의 최대 전류는 4.9mA이며, 출력 버퍼를 포함한 전체 시스템의 전력 소모는 30mA이다. 또한 800mA, 100KHz의 load current regulation 조건으로 시뮬레이션 시, 3.3V 출력전압에 대한 최대 리플 전압은 11mV, Over/Undershoot voltage는 각각 10mV, 19.6mV 이다. 코어 회로의 크기는 $700{\mu}m{\times}800{\mu}m$의 작은 면적으로 구현가능하다. 제안된 회로는 Dong-bu Hitek BCD $0.35{\mu}m$ 공정을 이용한 시뮬레이션을 통해 검증되었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.167-171
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• 2007

For ensuing rolling stock safety, it is necessary that safety management should be made systematically through its whole life cycle. That is to say, safety management activities for every steps of rolling stock life cycle should be defined, and the roles of managers such as executor, assessor, and certificator should be shared clearly. This paper defines the safety management activities based on IEC 62278, analyzing foreign and domestic safety regulation systems, and suggests the reformed safety management system for rolling stock in Korea

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.677-687
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• 2018

This paper presents a novel power decoupling control scheme with the bidirectional buck-boost converter for primary-side regulation photovoltaic (PV) micro-inverter. With the proposed power decoupling control scheme, small-capacitance film capacitors are used to overcome the life-span and reliability limitations of the large-capacitance electrolytic capacitors. Then, an improved flyback PV inverter is employed in continuous conduction mode with primary-side regulation for the PV power conditioning. The proposed power-decoupling controller shares the reference for primary side current regulation of the flyback PV inverter. The decoupling controller shapes the input current of the bidirectional buck-boost converter. The shared reference eliminates the phase-delay between the input current to the bidirectional buck-boost converter and the double frequency current at the PV primary current. The elimination of the phase-delay in dynamic response enhances the ripple rejection capability of the power decoupling buck-boost converter even with small film capacitor. With proposed power decoupling control scheme, the additional advantage of the primary-side regulation of flyback PV inverter is that there is no need to have an extra current sensor for obtaining the ripplecurrent reference of the decoupling current-controller of the power-decoupling buck-boost converter. Therefore, the proposed power decoupling control scheme is cost-effective as well as the size benefit. A new transient analysis is carried out which includes the source voltage dynamics instead of considering the source voltage as a pure voltage source. For verification of the proposed control scheme, simulation and experimental results are presented.

• 인터넷정보학회논문지
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• 제19권5호
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• pp.133-145
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• 2018

본 논문은 최근 급성장하고 있는 공유경제플랫폼에 대한 바람직한 규제 방안을 논하고 있다. 디지털 기술의 발전과 혁신은 새로운 서비스, 새로운 경제, 산업 가치의 창출이라는 기대도 큰 반면, 기존 산업과의 이해 충돌에서 발생하는 사회적 신뢰 문제에 대한 우려와 도전, 과제들을 야기한다. 공유경제 역시 새로운 수요와 공급을 창출하고 혁신적인 거래방식으로 전 세계적으로 빠른 성장을 하고 있지만, 아직도 주요 도시에서는 기존 산업 가치와의 충돌이 야기하는 문제에 대해 제도적 측면에서의 한계점이 노출되고 있다. 본 연구는 이러한 문제점을 최소화하기 위해 일정 수준의 규제가 필요함을 전제로 규제과정에서 수반되는 사회적 비용 최소화를 위해서 공유경제 특성을 고려한 공동규제(Co-regulation) 접근방안이 바람직함을 제안하고 있다.

• 한국컴퓨터정보학회논문지
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• 제28권7호
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• pp.179-187
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• 2023

소비자 신뢰는 공유 경제 발전에 중요한 역할을 한다. 본 연구는 소비자 신뢰에 영향을 미치는 요인을 중점적으로 다루며, 중국의 자전거 공유 산업에서 선두였던 오포(OFO)의 사례를 살펴보았다. 본 논문은 오포의 내부 경영 문제와 거의 파산상태에 이르기까지 소비자 신뢰의 하락을 분석합니다. 2018년 12월부터 오포가 직면한 "환불의 어려움" 문제는 계속해서 커져 왔으며, 본 연구는 이 상황을 배경으로 신뢰/불신에 영향을 주는 영향 요인들을 살펴보았다. 제품 요인(품질), 플랫폼 요인(결제 보안, 개인 정보 보호, 명성), 사회적 요인(사회 규범, 정부 규제)을 독립변수로 고려하여 소비자 신뢰에 영향을 미치는 요인을 분석합니다. 분석 결과, 공유 자전거에 대한 소비자의 불신이 커지면 전환의도가 높아지며, 회사의 평판과 사회적규범은 신뢰와 불신에 모두 영향을 미치고, 정부규제는 신뢰에 영향을 미친다는 것을 확인하였다. 연구 결과는 공유 경제 플랫폼에 시사하는 바가 있으며 향후 연구를 위한 지침을 제공할 수 있을 것으로 기대된다.