• Korean Journal of Childcare and Education
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• v.9 no.2
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• pp.97-115
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• 2013

The present study examined the relationships between work related flow (i.e., absorption, work enjoyment, and intrinsic work motivation) and role conflict causes (i.e., teacher's belief, teaching and interaction with young children, comradeship, relationships with parents, workload, supervision, and social awareness of the job). A canonical correlation analysis was performed on the data from a sample of 154 childcare teachers. The results are as follows (1) there was a reciprocal-causal relationship between teachers' role conflict causes and their work-related flow; (2) canonical function 1 showed that absorption and work enjoyment are strongly associated to a teacher's belief and supervision of conflict causes; and (3) canonical function 2 showed that intrinsic motivation has a relatively strong relationship with workload and supervision of conflict causes. It can be concluded that it is important for childcare teachers to have sufficient job resources to promote their flow at work. Further research is needed for investigation of teacher's flow at various conditions of work.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.131-133
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• 2014

클라우드 컴퓨팅은 워크플로우 응용의 처리에 있어 효율적으로 시스템을 구축할 수 있도록 한다. 그렇지만 여러 클라우드 사업자 측에서 다양한 서비스를 제공하고, 이로 인해 발생하는 복잡성으로 사용자 스스로 클라우드 인프라를 활용하여 워크플로우 처리를 수행하는 것은 어려운 일이며, 이 문제를 극복하기 위해 클라우드 브로커 시스템이 도입되었다. 이와 같은 브로커 시스템에서 워크플로우를 처리할 때 사용자가 지정한 품질 제약을 만족시키는 이슈를 해결하기 위해 많은 워크플로우 스케쥴링에 대한 연구들이 수행되었다. 본 논문에서는 클라우드 환경에서 보다 효율적인 워크플로우 처리를 위해 기존 워크플로우 스케쥴링 기법의 연구들에 대한 특징과 한계에 대한 조사를 수행하였다.

• Proceedings of the KIPE Conference
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• 2016.11a
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• pp.178-179
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• 2016

본 논문에서는 바나듐 레독스 플로우 배터리의 동작원리를 설명하고, C-rate에 따른 특성 분석을 하였다. 전해질 양이 18mL, 22mL일 때 0.1C, 0.3C, 0.5C, 0.7C, 0.9C, 1.0C로 전류의 크기에 변화를 주어 용량을 측정한 후 비교 분석하였다. 더불어 HPPC(Hybrid pulse power characterization) 실험에서 1.0C 일 때 잔존 용량(State-of-charge, SOC)의 변화에 따른 저항을 추출하였고 분석하였다. 그 결과 바나듐 레독스 플로우 배터리의 효율 분석을 위한 파라미터 값을 확인하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.9
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• pp.814-821
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• 2012

We propose a network processor called an OmniFlow processor capable of wire-speed flow management by a hardware-based flow admission control(FAC) in this paper. Because the OmniFlow processor can set up and release a wire-speed connection for flows, the update period of flows can be set to a short time, and only active flows can be effectively managed by terminating a flow that does not have a packet transmitted within this period. Therefore, the FAC can be used to provide a reliable transmission of UDP as well as TCP applications. This processor is fabricated in 65nm CMOS technology, and total gate count is 25 million. It has 40 Gb/s throughput performance in using the 32 RISC cores when maximum operating frequency is 555MHz.

• Journal of Internet Computing and Services
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• v.17 no.1
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• pp.47-53
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• 2016

A type of workflow affiliation network is one of the specialized social network types, which represents the associative relation between actors and activities. There are many methods on a workflow affiliation network measuring centralities such as degree centrality, closeness centrality, betweenness centrality, eigenvector centrality. In particular, we are interested in the closeness centrality measurements on a workflow affiliation network discovered from enterprise workflow models, and we know that the time complexity problem is raised according to increasing the size of the workflow affiliation network. This paper proposes an estimated ranking algorithm and analyzes the accuracy and average computation time of the proposed algorithm. As a result, we show that the accuracy improves 47.5%, 29.44% in the sizes of network and the rates of samples, respectively. Also the estimated ranking algorithm's average computation time improves more than 82.40%, comparison with the original algorithm, when the network size is 2400, sampling rate is 30%.

• Journal of KIISE:Databases
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• v.30 no.2
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• pp.197-208
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• 2003

Abstract Workflow is not appropriately applied to coordinated execution of applications(steps) that comprise business process such as a collaborative series of tasks because of the lacks of network infra, standard of information exchange and data consistency management with conflict mode of shared data. Particularly we have not mentioned the problem which can be occurred by shared data with conflict mode. In this paper, to handle data consistency in the process of rollback for failure handling or recovery policy, we have classified rollback dependency into three types such as implicit rollback dependency in a transactional workflow, implicit rollback dependency in collaborative transactional workflows and explicit rollback dependency in collaborative transactional workflows. Also, we have proposed the rollback dependency compiler that determines above three types of rollback dependency. A workflow designer specifies the workflow schema and the resources accessed by the steps from a global database of resources. The rollback dependency compiler generates the enhanced workflow schema with the rollback dependency specification. The run-time system interprets this specification and executes the rollback policy with data consistency if failure of steps is occurred. After all, this paper can offer better correctness and performance than state-of-the-art WFMSs.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.280-282
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• 2002

최근 업무 전산화로 인한 분산 컴퓨팅 환경이 확대되고 네트워크 기반의 응용 서비스들이 다양하게 개발됨에 따라 네트워크 트래픽은 증가 일로에 있으며 어느 호스트에서 어떤 형태의 트래픽이 얼마만큼 유발되는지를 알아내는 일은 한정된 네트워크 자원을 효율적으로 활용하는데 매우 중요한 일이 되었다. 하지만, 현재의 네트워크관리시스템들은 트래픽 모니터링에 따른 통계값 제공 등의 단순 평면적인 정보만을 제공할 뿐, 네트워크를 정밀 분석하고 그에 따른 대책을 마련하기에는 미약하다. 따라서 효율적인 네트워크 자원 활용을 위하여 네트워크 트래픽을 자세히 분석하며, 네트워크 계층별, 지역별, 호스트별 및 응용 서비스 별로 트래픽을 측정 및 분석할 수 있는 시스템의 개발이 필요하다. 본 논문은 한국전력데이터통신망을 대상으로 네트워크 트래픽의 발원지로부터 목적지까지의 백본 및 LAN 구간에서의 트래픽을 플로우별로 수집, 분석할 수 있는 트래픽 분석 시스템을 설계 및 구현하였다본 시스템은 트래픽 측정을 위해 백본에서는 Netflow 기능을 이용하며, LAN 구간에서는 패킷 캡처 방식의 Probe를 이용한다. 이때 기존의 패킷 캡처 방식의 기능을 개선하여 이를 플로우화 함으로써 LAN구간에서도 동일한 인터페이스를 통하여 네트워크 트래픽을 분석할 수 있게 하였다.

• Journal of the Korean GEO-environmental Society
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• v.18 no.12
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• pp.65-75
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• 2017

Flowability and strength with curing time of controlled low-strength material (CLSM) are required differently according to the construction purpose. In this paper, the flowability and strength were estimated from the mixing ratio of CLSM using multiple regression analysis to design the CLSM. The flow values and strength at 12 hrs and 7days were measured in accordance with the mixing ratio of CLSM which consists of 7 different materials, such as CSA expansive agent, ordinary Portland cement, fly ash, sand, silt, water, and accelerator. The multiple regression was performed with the proportions of each material of CLSM as independent variables and the measured properties as dependent variables using SPSS Statistics 23 which is a statistical analysis program. The regression coefficients were estimated from the first to third order equation models for the materials. From the results, the third order model for the flow values and the first order models for 12hrs and 7days strength are the most appropriate models. This study suggests that the mixing ratio required for constructions may be effectively estimated from the regression models about the characteristics of CLSM, before performing experimental tests.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.12
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• pp.8363-8369
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• 2015

This study is to be investigate properties of workability, compacting and compressive strength replaced by the illite powder in high fluidity concrete. For this purpose, illite powder has replaced the binder of high fluidity concrete of 5%, 10%, 15%, 20%. After concrete mixing, slump flow test, reach time slump flow 500mm, O-lot test were conducted on fresh high fluidity concrete. And compressive strength was determined 28 days for the hardened high fluidity concrete specimens. According to the test results, the workability, filling height of high fluidity concrete were increased in 10% replacement of illite powder. Furthermore, the compressive strength of high fluidity concrete was increased in 10% replacement of illite powder.. It was possible to confirm that optimal mixture ratio of illite powder seems to exist, and it is shown to be 10% according to our experimental results.

• Broadcasting and Media Magazine
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• v.8 no.2
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• pp.84-104
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• 2003

방송 인프라도 드디어 ENG VCR시대를 넘어 컴퓨터시대로 점차 마이그레이션 하고 있다. 이같은 IT기반의 환경은 워크플로우 개선을 통한 회사 경쟁력 향상를 도모함과 아울러 조직의 리엔지니어링을 가속화하여 조직의 최적화(Optimization)를 구현한다. 예를 들면 워크플로우 개선 측면으로는 콘텐츠 입력$\cdot$검색$\cdot$모니터(Acquisition ＆ Searching ＆ Browsing), 자료의 복사$\cdot$편집(Copying ＆ Editing), 프로그램의 배달$\cdot$송출$\cdot$출력(Delivery ＆ Transmission ＆ Retrieval)등이 새롭게 나타나거나 변하여 시간비용을 대폭 절감하고, 업무의 정형화 및 리소스 공유로 효율적 비용관리와 분배구조를 구축하며, 작업과 승인 프로세스의 원활화로 생산성이 크게 향상된다. 또한 하루 24시간, 1년 365일 상시 운용이 가능하며, 테이프 구입비, 시스템 보수.유지비(TCO)등 각종 비용이 크게 절감된다. 디지털 아카이브 구축으로 콘텐츠 재활용의 극대화, 콘텐츠의 효율적인 관리, 효율적 콘텐츠 가공, 다양한 메체로 전환가능, 지적 재산권의 확보가 가능하다. 이밖에 원소스 멀티유즈 환경 구축을 통해 다양한 수의 창출 채널이 확보되고, 새로운 상품 개발이 가능하며, 고객의 니즈에 더욱 충실해 질 수 있다. 이같이 방송 인프라의 펀더멘탈 변화에 의해 방송제작$\cdot$편집$\cdot$송출에 관련된 환경이 크게 바뀐다.