• 한국콘텐츠학회논문지
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• 제9권5호
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• pp.277-283
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• 2009

국제결혼이 문제가 되는 경우는 대부분 2세들이 사화와의 충돌이나 갈등을 야기 시키기 때문이므로 이 문제가 부각되기 전에 이에 대한 연구와 준비가 필요하다. 이에 본 연구는 다문화(국제결혼) 가정 자녀들의 보육시설에서의 행동특성을 분석하여 언어, 정서, 또래관계, 집중력 등의 발달 수준이 일반 가정의 어린이들과 어떤 차이가 있는지를 분석하였으며, 그 결과에 의하여 다문화가정 자녀의 보육지도를 위한 교수 전략을 개발하였다.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권2호
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• pp.53-57
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• 2012

The mathematical model of a three-phase voltage source pulse-width modulation (PWM) DC/AC inverter is non-linear, and in view of the traditional linear control strategy it can not meet the requirements of designing a high-performance inverter. What's more, when the loads are not pure resistive loads, the inverter further requires that the controller possess high-performance. This paper proposes a nonlinear control strategy for the inverter called Passivity-based Control. We can alter the inverter model in three-phase abc coordinate to two-phase synchronous rotating dq coordinate for establishing the port-control Hamiltonian (PCH) model for this system. We can control the distribution of energy in the system to achieve the control aim. Simulation results show that the passivity-based control method can make this system possess a level of high-performance that is both robust and dynamic.

• 조명전기설비학회논문지
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• 제23권2호
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• pp.182-189
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• 2009

경쟁적 전력시장에서 발전회사의 전략적 행위를 분석하기 위해서 일반적으로 내쉬균형(Nash equilibrium) 이론이 널리 사용되고 있다. 기존 연구에 의하면 송전제약이 있는 전력시장에서는 최적반응의 불연속으로 인해 순수전략내 쉬균형이 존재하지 않게 되고, 이때는 혼합전략 내쉬균형이 전력시장의 균형이 된다. 본 논문에서는 송전제약이 있는 2-지역 전력시장에서 혼합전략 내쉬균형을 유도하고, 송전용량이 혼합전략 내쉬균형에 미치는 영향을 해석하였다.

• 한국IT서비스학회지
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• 제11권1호
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• pp.273-292
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• 2012

Manufacturers have started to adopt service as their offering mix in order to overcome slow growth, declining profitability and commoditization in the pure product market. Several companies like IBM and GE have shown that services would be a new source of revenue and a steady growth. Service covers a wide spectrum from a simple add-on service like repair to complex outsourcing service. Service adoption is a challenge for manufacturers who have been accustomed to product making and selling. Making, proposing, delivering and evaluating services needs a different and new capabilities for manufacturers. And service transition is closely related with capabilities which make a transition with a less risk. In this paper, a taxonomy of efforts is developed which build on the service transition literatures and cases. We provide a phased service transition strategy for manufacturers and service capabilities needed at each phases.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권8호
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• pp.2666-2687
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• 2022

As a new alternative communication scheme in 5G, unmanned aerial vehicle (UAV) is used as a relay in the remote base station (BS) for assistant communication. In order to ameliorate the quality of the backhaul link, a UAV backhaul transmission scheme based on improved Nash equilibrium (NE) strategy is proposed. First, the capacity of air-to-ground (A2G) channel by the link preprocess is maximized. Then, the maximum utility function of each UAV is used as the basis of obtaining NE point according to the backhaul channel and the backhaul congestion. Finally, the improved NE strategy is applied in multiple iterations until maximum utility functions of all the UAVs are reached, and the UAVs which are rejected by air-to-air (A2A) link during the process would participate in the source recovery process to construct a multi-hop backhaul network. Simulation results show that average effective backhaul rate, minimum effective backhaul rate increases by 10%, 28.5% respectively in ideal A2G channel, and 11.8%, 42.3% respectively in fading channel, comparing to pure NE strategy. And the average number of iterations is decreased by 5%.

• Nuclear Engineering and Technology
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• 제48권4호
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• pp.915-924
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• 2016

After a severe accident to the nuclear reactor, the in-vessel retention strategy is a key way to prevent the leakage of radioactive material. Nanofluid is a steady suspension used to improve heat-transfer characteristics of working fluids, formed by adding solid particles with diameters below 100nm to the base fluids, and its thermal physical properties and heat-transfer characteristics are much different from the conventional working fluids. Thus, nanofluids with appropriate nanoparticle type and volume concentration can enhance the heat-transfer process. In this study, the moving particle semi-implicit method-meshless advection using flow-directional local grid method is used to simulate the bubble growth, departure, and sliding on the downward-facing heating surface in pure water and nanofluid (1.0 vol.% $Al_2O_3/H_2O$) flow boiling processes; additionally, the bubble critical departure angle and sliding characteristics and their influence are also investigated. The results indicate that the bubble in nanofluid departs from the heating surface more easily and the critical departure inclined angle of nanofluid is greater than that of pure water. In addition, the influence of nanofluid on bubble sliding is not significant compared with pure water.

• Asia pacific journal of information systems
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• 제17권2호
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• pp.83-95
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• 2007

We are motivated by how offline and online firms compete. The Internet made many conventional offline firms build a dynamic online business as another sales channel using their advantages such as brand equity, an existing customer base with comprehensive purchasing data, integrated marketing, economies of scale, and longtime experience with the logistics of order fulfillment and customer service. Even though the hybrid selling using both offline and online channel seems to have advantages over a pure online retailer, all the conventional offline firms are not seen to create an online business. Many conventional offline firms began to launch online business since the Internet era, however, just being online business is not likely to guarantee success. According to Bizate.com's report whether the hybrid channel strategy is successful is still under investigation. For example, consider the classic case of Barnes and Noble versus Amazon.com, Barnes and Noble was already the largest chain of bookstores in the U,S., when Amazon.com was established in 1995, BarnesandNoble.com followed suit in 1997, After suffering losses in its initial years, Amazon finally turned profitable in 2003. In 2004, Amazon's net income was $588 million on revenues of $6.92 billion, while Barnes and Noble earned $143 million on revenues of $4.87 billion, which included BarnesandNoble.com's loss of $21 million on revenues of $420 million. While these examples serve to motivate our thinking, it does not explain when offline firms should venture online. It also does not provide an analytical framework that can generalized to other competitive online-offline situations. We attempt to do this in this paper and analyze a hybrid channel model where a conventional offline firm competes against online firms using its own direct online channels. We are particularly interested in an optimal channel strategy when a conventional offline firm sells its products through its own direct online channel to compete with other rival online firms. We consider two situations where its direct online channel and other online firms are symmetric and asymmetric in the brand effect. The analysis of this paper presents several findings. In the symmetric model where a hybrid firm's online channel is not differentiated from a pure online firm, (i) a conventional offline firm will not launch its online business. In the asymmetric model where a hybrid firm's online channel is differentiated from a pure online firm, (ii) a conventional offline firm can launch its online business if its brand effect is greater than a certain threshold. (iii) there is a positive relationship between its brand effect and online customer costs showing that a conventional offline firm needs more brand effect in order to launch online business as online customer costs decrease. (iv) there is a negative relationship between its brand effect and the number of customers with access to the Internet showing that a conventional offline firm tends to launch its online business when customers with access to the Internet increases.

• 경영과정보연구
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• 제38권4호
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• pp.1-24
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• 2019

본 연구는 MIM(Mobile Instant Messenger) 서비스에서 소비자들이 구매하는 이모티콘 번들의 구성을 개인이 선택 가능토록 하는 맞춤화(customization)를 하는 것에 대한 소비자들의 반응을 설문을 통해 확인함으로써, 이모티콘 시장에서 맞춤 번들링이 유효한 마케팅 전략인지를 증명하고자 한다. 현재 국내 MIM 서비스에서 이용되는 이모티콘은 순수 번들링의 형태이다. 이에 따라 이모티콘 번들 내에 포함된 모든 이모티콘을 사용하지 않음에도 필요한 이모티콘만 따로 구입이 불가능하기 때문에 어쩔 수 없이 번들 전체를 구입해야 한다. Hitt and Chen (2005)과 Wu and Anandalingam (2002)은 소비자가 순수 번들링에 포함된 제품 및 서비스 중 일부만 가치있게 생각한다면 맞춤 번들링이 훨씬 수익성이 좋음을 증명하여 순수 번들링의 대안으로서 제시한 바 있다. 맞춤 번들링은 한계비용이 0에 가까운 상품일 때 적합한데, 이모티콘과 같은 정보재의 경우 이러한 조건을 충족한다. 반면, 맞춤 번들링은 선택 가능한 옵션을 증가시키기 때문에 복잡성의 문제를 낳을 수 있고(Blecker et al., 2004), 소비자는 정보의 과부화를 겪게 될 수도 있다(Huffman & Kahn, 1998). 따라서 맞춤 번들링 도입 필요성에 대한 판단은 상품의 특성 및 소비자들의 반응에 대한 실증적 분석을 통해 이루어질 필요가 있다. 설문조사를 통해 얻은 자료를 분석한 결과, 맞춤 번들링을 도입하였을 때, 소비자들의 구매의도와 지불의 사금액은 유의하게 증가하였다. 맞춤 번들에 대한 구매의도는 기존 순수 번들에 대한 구매의도보다 리커트 5점척도 기준으로 0.44 정도가 증가하였다. 구매의도의 증가 정도는 기존에 순수 번들을 구매한 경험의 유무에 따른 차이가 없는 것으로 확인되었다. 기존에 순수 번들 구매 경험이 없는 그룹의 경우는 50% 정도의 응답자가 맞춤 번들의 구매의향을 밝힌 것으로 확인되었다. 반면 구매 경험이 있는 그룹에서는 87% 응답자가 구매의향을 밝힌 것으로 나타났다. 지불의사금액은 전체 그룹에서 기존 이모티콘 가격 대비 약 2.8% 증가하였다. 기존 구매경험에 따라 분류하여 분석하면, 구매 경험이 있는 그룹에서는 5.9% 증가하였고 구매 경험이 없는 그룹은 기존 가격 대비 약 5%가 싸다면 살 의향이 있는 것으로 나타났다. 종합적으로 이모티콘 번들에 맞춤 번들링을 도입하는 것은 소비자의 긍정적 반응을 이끌어낼 수 있으며, 실무적으로도 유효한 마케팅 전략이 될 수 있을 것으로 판단된다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1450-1455
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• 2005

This paper describes a DR construction for land navigation and the sigma point based receding horizon Kalman FIR (SPRHKF) filter for DR/GPS hybrid navigation system. A simple DR construction is adopted to improve the performance both of the pure land DR navigation and the DR/GSP hybrid navigation system. In order to overcome the flaws of the EKF, the SPKF is merged with the receding horizon strategy. This filter has several advantages over the EKF, the SPKF, and the RHKF filter. The advantages include the robustness to the system model uncertainty, the initial estimation error, temporary unknown bias, and etc. The computational burden is reduced. Especially, the proposed filter works well even in the case of exiting the unmodeled random walk of the inertial sensors, which can be occurred in the MEMS inertial sensors by temperature variation. Therefore, the SPRHKF filter can provide the navigation information with good quality in the DR/GPS hybrid navigation system for land navigation seamlessly.

• Journal of Information Technology Applications and Management
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• 제15권3호
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• pp.111-125
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• 2008

The management of organizational Human Resource is steadily shifting away from pure hierarchical to market mechanisms that involve external vendors. HR Business Process Outsourcing (BPO) has recently emerged as a significant administrative innovation in an organization's strategy. Our paper attempts to understand firm-specific factors influencing the scope of HR BPO needs. Study results show that IT maturity and firm size are influential factors on the scope of HR BPO needs. We hope that our attempt at empirically examining and predicting this emergent phenomenon will stimulate others to look at this important strategic challenge facing firms from a theoretical perspective. Such research initiatives will allow us not only to better understand this complex phenomenon, but also to drive useful management prescriptions grounded on theory-based research.