• Korean System Dynamics Review
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• v.12 no.1
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• pp.89-114
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• 2011

With steady increase in the demand for door-to-door delivery services, courier service providers are facing a constant pressure to reduce delivery price in order to secure quantity order and to improve the efficiency and reliability for customer service. The objective of this research is to explain the structure of the door-to-door delivery including door-to-door delivery service demand, sorting capacity in the hub-terminal, and the system performance measures such as service reliability networks using causal loop diagram(CLD). Based on causal relation, this research describes a comprehensive approach to examine how capacity reliability contributes to the renewal of the firm's competences through its reciprocal relationship with travel time reliability and connectivity reliability. Also, this research suggests the policy alternatives to improve effectiveness and efficiency of door-to-door delivery network in response to increase customer satisfaction and profit maximization of the courier service providers: operational, tactical, and strategic levels.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.14 no.4
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• pp.31-37
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• 2006

In this paper, an experimental study on the robust input shaping for control of the residual vibration of flexible structures has been investigated. Two approaches has been used for the robustness of input shaping: the first method is to increase the number of impulses, and the other includes an EI shaper using vector diagram. The input case designed by the application of the above methods has been applied to a control problem involving residual vibration of a rotating hub with two flexible appendages. It has been found by a series of experiments that the input shaper designed in this paper works well for the residual vibration control of the flexible structure.

• 한국디지털정책학회:학술대회논문집
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• 2005.11a
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• pp.209-220
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• 2005

지식경영은 기업의 지속적 경쟁력을 제공하는 중요한 경영기법으로 인식되고 있다. 그러나 많은 기업에서 know-how 지식이나 know-where 지식을 축적하여 놓고 관련 평가체계를 잘 정립하면 향후 사용될 것이라는 전제하에 지식관리를 하고 있는 실정이다. 이러한 관점에서 본 논문은 지식관리를 조직업무형태에 따른 체인, 허브, 웹 유형으로 구분, 관리함이 효과적일 것이라는 가설을 기존 논문을 근거로 도출하였다. 이 중에서 가장 관리하기가 어렵다고 판단된 웹 혹은 네트워크 유형의 지식관리를 체계적으로 하기 위해서는 네트워크의 구조 자체에 대한 분석이 클러스터링 계수와 네트워크를 확장하는 역할을 담당할 수 있는 구성원에 대하여 이루어져야함을 e-Business 모델을 이용하여 제시하였다. 이러한 네트워크의 선행분석은 기존의 지식관리방법론을 보다 적극적인 관점에서 계획 및 통제할 수 있는 수단을 제공할 수 있을 것으로 판단된다.

• 유체기계공업학회:학술대회논문집
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• 2003.12a
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• pp.631-638
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• 2003

The wind turbine blade is the equipment converted wind into electric energy. The effect of the blade has influence of the output power and efficiency of wind turbine. The design of blade is considered of lift-to-drag ratio, structure, a condition of process of manufacture and stable maximum lift coefficient, etc. This study is used the simplified method for design of the aerodynamic blade and aerodynamic analysis used blade element method. This process is programed by delphi-language. The program has any input values such as tip speed ratio, blade length, hub length, a section of shape and max lift-to-drag ratio. The program displays chord length and twist angle by input value and analyzes performance of the blade.

• Proceedings of the Korea Database Society Conference
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• 2000.11a
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• pp.186-197
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• 2000

기업의 해체 이후 등장한 인터넷 비즈니스 기업들은 기존의 오프라인 기업들과는 달리 비즈니스에 의한 수익을 올리지 못하고 있다. 아직도 임계점에 도달하지 못해서 그런 것일까\ulcorner 아니면 기존의 수익 구조로는 어떤 한계가 있는 것일까\ulcorner 많은 연구에서 인터넷 비즈니스는 선점의 효과를 강조하고 있다. 경쟁에서 먼저 임계점에 도달한 인터넷 기업들은 주가로 보상을 받고 있기도 하다. 그러나, 임계점에 도달한 기업이 아직도 비즈니스에 의한 수익의 창출에는 그다지 성과를 올리지 못하고 있는 것 같다. 본 연구에서 주장하는 것은 다음의 두 가지이다. 첫째는, 인터넷 비즈니스 기업들은 임계점을 중시한 나머지 수익 구조에 대한 전략의 수립에 실패하였다. 둘째는, 인터넷 비즈니스 기업들은 기존의 오프라인 기업들과는 달리 온라인 기업 중심으로 이루어 졌기 때문에 기존의 오프라인 기업들과는 근본적으로 다른 수익 구조를 가져야 할 것이다. 즉, 기존의 온라인 기업들의 사업 방식과는 달라야 한다. 누구나 흉내낼 수 있는, 그래서 경쟁상의 우위를 지속적으로 유지시키기가 어려운, 운영의 효율성 중심이 아닌, 어떤 차별화된 전략을 가져야 할 것이다.

• Proceedings of the KIEE Conference
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• 2004.05a
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• pp.77-79
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• 2004

Because robot hardware architecture generally is consisted of a few sensors and motors connected to the central processing unit, this type of structure is led to time consuming and unreliable system. For analysis, one of the fundamental difficulties in real-time system is how to be bounded the time behavior of the system. When a distributed control network controls the robot, with a central computing hub that sets the goals for the robot, processes the sensor information and provides coordination targets for the joints. If the distributed system supposed to be connected to a control network, the joints have their own control processors that act in groups to maintain global stability, while also operating individually to provide local motor control. We try to analyze the architecture of network-based humanoid robot's leg part and deal with its application using the CAN(Controller Area Network) protocol.

• BMB Reports
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• v.54 no.5
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• pp.246-252
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• 2021

The Golgi complex plays a central role in protein secretion by regulating cargo sorting and trafficking. As these processes are of functional importance to cell polarity, motility, growth, and division, there is considerable interest in achieving a comprehensive understanding of Golgi complex biology. However, the unique stack structure of this organelle has been a major hurdle to our understanding of how proteins are secreted through the Golgi apparatus. Herein, we summarize available relevant research to gain an understanding of protein secretion via the Golgi complex. This includes the molecular mechanisms of intra-Golgi trafficking and cargo export in the trans-Golgi network. Moreover, we review recent insights on signaling pathways regulated by the Golgi complex and their physiological significance.

• Asia Marketing Journal
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• v.22 no.3
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• pp.71-85
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• 2020

Social media has emerged as a major hub of engagement between brands and consumers in recent years, and allows user-generated content to serve as a powerful means of encouraging communication between the sides. However, it is challenging to negotiate user-generated content owing to its lack of structure and the enormous amount generated. This study focuses on the hashtag, a metadata tag that reflects customers' brand perception through social media platforms. Online users share their knowledge and impressions using a wide variety of hashtags. We examine hashtags that co-occur with particular branded hashtags on the social media platform, Instagram, to derive insights about brand perception. We apply text mining technology and network analysis to identify the perceptions of brand images among consumers on the site, where this helps distinguish among the diverse personalities of the brands. This study contributes to highlighting the value of hashtags in constructing brand personality in the context of online marketing.

• The Bulletin of The Korean Astronomical Society
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• v.45 no.1
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• pp.42.1-42.1
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• 2020

Filamentary structures pervade the whole kind of molecular clouds from low- to high-mass star-forming clouds, and the non-star-forming clouds. It is supposed to be a prerequisite stage of star formation, and hence how filaments and dense cores form is one of the critical questions in the early star formation study. We investigated the dynamics and chemistry of dense cores in IC5146 using TRAO FUNS (TRAO Survey of the nearby Filamentary molecular clouds, the Universal Nursery of Stars) data. In addition, we performed polarization observation using JCMT Pol-2 polarimetry to investigate the magnetic field morphology within a core-scale. In the presentation, we will present the result of TRAO FUNS and JCMT/Pol2 observation toward the filaments and dense cores in the IC5146. We aim to reveal the roles of gravity, turbulence, and magnetic field in the formation of dense cores in the western hub-filament structure of IC5146.

• Journal of the Korean Geographical Society
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• v.50 no.5
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• pp.527-541
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• 2015

The purpose of this study is to investigate the changes in the inter-city passenger flows since adapting the express rail system in Korea(KTX). For the purpose, we analyze the express bus and rail passenger annual flow data of the before and after adapting KTX. In first, we examine the changes in the time-distance parameters in the inter-city passenger flows of the express bus, general rail, and KTX by applying gravity model. The results reveal that express bus passenger flows are less sensible to the time-distance compare to the rail passenger flows, and the trends have been intensified over time. However, the time-distance parameters for the KTX passenger flows reveal the reverse relationships with the gravity model. The KTX passenger flows expand between the long distance cities. We also apply the MST(Maximum Spanning Tree) method to find out the spatial structural changes in the inter-city passenger flows. The number of hierarchies has been increased in the express bus and general rail passenger flows, while single hierarchical structure has been lasted in the KTX passenger flows.