과업 갈등상황에서 스타트업 팀의 민첩성 향상을 위한 의사소통과 지식공유 프로세스에 관한 연구

이세윤,박준기,이혜정 한국벤처창업학회 2016 벤처창업연구 Vol.11 No.6

Startup teams should be prompt to seize an business opportunity and handle various business problems with which they has not been faced before. This research examines and compares the hypotheses about the processes of communication media usage, knowledge sharing and team agility by the level of task conflict. In order for detailed investigation, each of antecedent was divided into sub-dimensions: communication media usage into synchronous and asynchronous media usage, and knowledge sharing into speed and quantity of knowledge sharing. Team agility, the dependent variable, was proposed as an important success factor of startup teams. The research model describes that the communication media usage affects knowledge sharing and consequently team agility. The differences of media usage and relationships among variables were proposed as the level of task conflict in teams. 230 data points were collected from startup teams under 5 years and statistically processed to test research model and hypotheses. From the total sample analysis, the results indicate that the knowledge sharing speed is positively associated with the quantity, and the knowledge sharing speed and quantity have positive associations with team agility. Both synchronous and asynchronous communication media usage also has significant positive associations with knowledge sharing speed. On the other hand, media usage did not show significant direct association with knowledge sharing quantity. From the group comparisons of task conflict, it was found that the higher task conflict, the higher in media usage, knowledge sharing speed and quantity, and team agility. The process of media usage, knowledge sharing, and team agility were found to be different between the high and low task conflict. From these results, the authors discussed and proposed some implications for startup team leaders. 스타트업 팀은 시장의 비즈니스 기회를 신속하게 포착해야 함은 물론이고 이전에 경험해 보지 못한 다양한 문제들을 해결해야만 한다. 본 연구는 신생 조직이나 팀에서 의사소통 매체의 활용을 통해 지식 공유를 거쳐 팀의 민첩성으로 이어지는 프로세스에 대한 가설을 검증하고 과업 갈등에 따른 차이를 비교하기 위한 연구이다. 의사소통 매체의 활용 측면에서 동시적, 비동시적 매체 사용으로 구분하였고, 지식 공유는 속도와 양으로 나누어 영향을 비교하였다. 그리고 신생 조직의 중요한 성과 변수로서 팀의 민첩성을 종속 변수로 설정하였다. 연구 모형을 통해 의사소통 매체를 사용함으로써 지식 공유가 이루어지며 결과적으로 팀의 민첩성에 영향을 주며, 팀의 과업 갈등의 정도에 따라 의사소통 매체의 활용 정도나 변수들 간 관계에 차이가 있을 것이라는 가설을 제시하였다. 설립된 지 5년 미만의 스타트업 팀 230개를 대상으로 설문조사를 통해 데이터를 수집하고 통계적으로 분석하였다. 분석 결과, 갈등 상황을 고려하지 않은 전체 집단에서, 지식 공유의 속도가 빠르면 지식공유의 양이 증가하고, 지식 공유의 속도와 양이 높으면 민첩성이 높아지는 관계를 확인하였다. 또한, 의사소통 매체는 동시적이건 비동시적이건 간에 모두 지식 공유의 속도에 유의미한 영향을 미치는 것으로 나타났다. 한편, 과업갈등의 정도에 따른 분석에서는, 과업갈등이 높은 집단이 낮은 집단에 비해 매체의 사용, 지식 공유의 속도와 양, 민첩성이 더 높았다. 또한, 매체의 사용, 지식 공유, 민첩성으로 이어지는 프로세스에서도 집단 간 차이를 확인하였다. 이러한 결과에 따라 스타트업 팀의 리더를 위한 시사점을 제시하였다.

Low-Voltage and High-Current DC Output Realized by Multiple Power Cells Based on Deadbeat and Automatic Current Sharing Control

Liu, Jinfeng,Zhang, Yu,Wang, Xudong,IU, Herbert Ho-Ching The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.8 No.1

This paper presents a synchronous generator with a distributed system of multiple parallel three-phase power cells. This generator can immediately output high DC. Each power cell comprises three-phase windings and a three-phase synchronous rectification bridge with a deadbeat control of load power feedforward, which can improve the characteristics of dynamic response and reflect the load variance in real time. Furthermore, each power cell works well independently and modularly using the method of automatic maximum current sharing. The simulation and experimental results for the distributed controller of multiple power cells demonstrate that the deadbeat control method can respond quickly and optimize the quality of the energy. Meanwhile, automatic maximum current sharing can realize the validity of current sharing among power cells.

Low-Voltage and High-Current DC Output Realized by Multiple Power Cells Based on Deadbeat and Automatic Current Sharing Control

Jinfeng Liu,Yu Zhang,Xudong Wang,Herbert Ho-Ching IU 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.4

This paper presents a synchronous generator with a distributed system of multiple parallel three-phase power cells. This generator can immediately output high DC. Each power cell comprises three-phase windings and a three-phase synchronous rectification bridge with a deadbeat control of load power feedforward, which can improve the characteristics of dynamic response and reflect the load variance in real time. Furthermore, each power cell works well independently and modularly using the method of automatic maximum current sharing. The simulation and experimental results for the distributed controller of multiple power cells demonstrate that the deadbeat control method can respond quickly and optimize the quality of the energy. Meanwhile, automatic maximum current sharing can realize the validity of current sharing among power cells.

동기적 웹 브라우저 공유를 지원하는 협동작업 시스템

김문석(Moon Suk Kim),성미영(Mee Young Sung) 한국정보처리학회 2001 정보처리학회논문지B Vol.8 No.3

Collaborative computing is an environment that allows participants to share their information synchronously or asynchronously so that they can do their job more effectively and accurately. In the past, collaborative computing has included e-mail, Internet chatting, whiteboard, videoconferencing as well as other Internet application programs. In this paper, we introduce a system in which participants can share their documents and databases through the web for more efficient collaboration. The user can host their web browser across other terminals using URL, Form, Scroll, and Window Size Synchronization. URL Synchronization controls synchronously the movement and direction of Internet browsing while Form Synchronization allows the user to show inputs on the web in real-time. Scroll Synchronization is used to control the scrolling of the web page for sharing the same part in the web browser whereas Window Size Synchronization adjusts the length and width parameters of the web browser.

클라우드 서비스 기반 이기종간의 데이터 공유 기법

서정희(Jung-Hee Seo),박흥복(Hung-Bog Park) 한국정보통신학회 2018 한국정보통신학회논문지 Vol.22 No.3

일반적인 이기종 디지털 장치들간의 데이터 공유는 다양한 인터페이스로 인해 많은 문제를 야기시킨다. 이런 문제를 해결하기 위해서 본 논문은 서로 다른 장치들간의 통신을 지원하는 D2D 통신을 사용하여 클라우드 서비스와 모바일을 결합한 이기종간의 데이터 공유를 제안한다. 제안된 기법은 데이터 동기화를 수행하기 위해 서버에 집중되는 부하를 줄이는 프로세스로 수행되며, 장치들간의 데이터 복제로 인한 지연을 최소화하기 위해 청크 리스트에 수정된 부분만을 복사하여 데이터 쓰기 속도에 기여하기 위한 기술을 채택하고, 데이터 공유를 위한 동기화로 소모되는 네트워크 대역폭을 최소화하기 위해서 모바일 환경과 결합한 클라우드 서비스 모델을 구현한다. 따라서 서로 다른 공간의 데이터를 효율적으로 공유하고 데이터의 무결성과 지연을 최소화할 수 있다. There are many problems caused by data sharing between general heterogeneous digital devices due to various interfaces. To solve this problem, this paper proposes heterogeneous data sharing with cloud service and mobile through D2D communication that supports communication between different devices. The proposed technique is used to reduce the load on the server to perform data synchronization. Also, in order to minimize data latency caused by data replication between different devices, a technique to enhance the speed of data writing with copying only the modified parts in the chunk list is adopted and cloud service model integrated with mobile environment is realized in order to minimize the network bandwidth consumed for synchronization for data sharing. Therefore, it is possible to share data in different spaces efficiently with maintaining data integrity and minimizing latency in data.

Research on the Power Sharing Control and Stability of VSGs

Xie, Dong,Zang, Da-Jin,Gao, Peng,Wang, Jun-Jia The Korean Institute of Power Electronics 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2

Aiming at the deficiencies of power sharing control performances when a traditional droop control is adopted for microgrid inverters, this paper proposes a microgrid inverter power sharing control strategy based on a virtual synchronous generator. This control method simulates the electromechanical transient characteristics of a synchronous generator in a power system by an ontology algorithm and the control laws of a synchronous generator by control over the speed governor and excitation regulator. As a result, that the microgrid system is able to effectively retain the stability of the voltage and frequency, and the power sharing precision of the microgrid inverter is improved. Based on an analysis of stability of a microgrid system controlled by a virtual synchronous generator, design thoughts are provided for further improvement of the power sharing precision of inverters. The simulation results shows that when the virtual synchronous generator based control strategy was adopted, the power sharing performances of microgrid inverters are improved more obviously than those using the droop control strategy.

Research on the Power Sharing Control and Stability of VSGs

Dong Xie,Da-Jin Zang,Peng Gao,Jun-Jia Wang 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2

Aiming at the deficiencies of power sharing control performances when a traditional droop control is adopted for microgrid inverters, this paper proposes a microgrid inverter power sharing control strategy based on a virtual synchronous generator. This control method simulates the electromechanical transient characteristics of a synchronous generator in a power system by an ontology algorithm and the control laws of a synchronous generator by control over the speed governor and excitation regulator. As a result, that the microgrid system is able to effectively retain the stability of the voltage and frequency, and the power sharing precision of the microgrid inverter is improved. Based on an analysis of stability of a microgrid system controlled by a virtual synchronous generator, design thoughts are provided for further improvement of the power sharing precision of inverters. The simulation results shows that when the virtual synchronous generator based control strategy was adopted, the power sharing performances of microgrid inverters are improved more obviously than those using the droop control strategy.

수학교실담론에 나타난 실시간 쌍방향 수업의 요소별 양상 분석: 권위 개념을 중심으로

전혜진,이경화 대한수학교육학회 2022 수학교육학연구 Vol.32 No.4

The purpose of this study is to explore how the elements of synchronous online learning emerge in mathematics classroom discourse through an authority lens. To this end, we analyzed synchronous online learning classes for 5th to 6th graders. Elements of synchronous online learning were divided into delivery system, interaction, content, and learners; and data modeling tasks were implemented. Findings indicate that the delivery system has both potential and risk for sharing authority in mathematics classroom discourses, and four types of interactions are formed (or not formed) in a differentiated manner, respectively. In addition, mathematics classroom discourses, such as providing teacher feedback and encouraging students supported students’ shared authority. Further, the content element combined with other elements, was found to influence sharing authority. These findings reveal some aspects that teachers should consider in designing and implementing synchronous online learning for shared authority.

Esterel에서 동기장치 중복사용 문제 검출시 과잉 경보 줄이기

윤정한(Jeong-Han Yun),김철주(Chul-Joo Kim),김성건(Seonggun Kim),한태숙(Taisook Han) 한국정보과학회 2010 정보과학회논문지 : 소프트웨어 및 응용 Vol.37 No.8

Esterel이라는 절차형(imperative) 동기(synchronous) 언어로부터 회로를 합성(synthesis)할때, 하나의 동기장치(synchronizer)가 한 클럭에 중복사용되는 문제(schizophrenic parallel synchronizer)가 발생할 수 있다. 기존 컴파일러는 동기장치가 중복사용될 경우 동기장치를 복제하여 이 문제를 해결하고 있다. 본 논문은 동기장치가 중복사용되더라도 회로상/기능상 문제가 없는 조건을 제시하고, 이를 기반으로 소스코드를 분석하여 복제해야만 하는 동기장치를 찾아주는 알고리즘을 제안한다. 이 알고리즘은 컴파일러가 중복사용되는 동기장치들 중에서 꼭 복제해야만 하는 것을 알 수 있게 해 주어, Esterel 프로그램을 좀 더 작은 회로로 합성할 수 있도록 한다. Esterel is an imperative synchronous language well-adapted to control-intensive systems. When an Esterel program is translated to a circuit, the synchronizer of a parallel statement may be executed more than once in a clock; the synchronizer is called schizophrenic. Existing compilers cure the problems of schizophrenic parallel synchronizers using logic duplications. This paper proposes the conditions under which a synchronizer causes no problem in circuits when it is executed more than once in a clock. In addition we design a detection algorithm based on those conditions. Our algorithm detects schizophrenic parallel synchronizers that have to be duplicated in Esterel source codes so that compilers can save the size of synthesized circuits.

Control Method of Self-Frequency Recovery and Active Power Sharing for an Isolated Microgrid Based on VSGs

Pengxiang Xing,Fan Ma,Chunzheng Tian,Changqing Xu,Lili Wang 대한전기학회 2019 Journal of Electrical Engineering & Technology Vol.14 No.1

The concept of virtual synchronous generator (VSG) is emerging as an attractive solution for renewable energies to enhance the microgrid inertia and damping property by emulating the essential behaviors of conventional synchronous generators. However, in the isolated microgrid based on VSGs, there will be a frequency deviation when the power demand varies because of the droop characteristic of the VSG in active power–frequency regulation. In this paper, a control method for VSGs to implement self-frequency recovery and active power sharing in isolated microgrid is proposed. With this method, the VSGs regulate their power baseline values over multiple iterations through local-feedback of the frequency deviation until the microgrid frequency restores to normal value, and simultaneously share the power demand variation according to the ratio of their power baseline values. Compared to the previous studies, the proposed method can eliminate the output power and frequency oscillations in secondary control, and additionally, reduce the dependence of the microgrid on communication system, which is beneficial to enhance the robustness of the microgrid operation. Simulation results proved the proposed method to be effective.