• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2014년도 제50차 하계학술대회논문집 22권2호
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• pp.97-98
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• 2014

Lots of investment projects of new development and redevelopment for information systems have been not taken care of in the field of administration and evaluation, for these information systems projects have unique characteristics such as technology sensitiveness, network effectiveness, embeddedness, and externality. In fact, quantitative and qualitative evaluation of investments in information systems projects are not sufficient. It is critically important to generally evaluate benefits of development or operation cost, urgency, external effects, and so on. In addition, the efficient monitoring and effective analysis of information systems are surely needed for beneficient results of investment in information systems. We propose an economics evaluation model for information systems projects.

• 정보와 통신
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• 제29권10호
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• pp.3-8
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• 2012

본고에서는 스마트폰과 스마트TV 등과 같은 커넥티드 디바이스(connected device)에 관한 ICT 생태계(이하 '스마트 미디어 생태계')에 대해 알아본다. 스마트 미디어 생태계는 플랫폼을 중심으로 가치가 창출되는 생태계라는 특징을 가진다. 특히, 양면시장(two-sided market)에서 관찰되는 직/간접적 네트워크 외부성(direct and indirect network externality)에 의해 작동된다. 또한 단일 기능요소보다는 여러 사업자로부터 제공되는 기능요소들의 복합체인 플랫폼 연합체(platform coalition)로 출발한다. 이에 따라 생태계 초기에는 생태계 간 경쟁과 더불어 생태계 내에서 메타 플랫폼(meta platform)의 지위를 획득하려는 지배구조 경쟁도 전개된다. 스마트 미디어 생태계의 특성과 진화과정 및 운영원리에 대한 이해는 생태계 참여자들의 전략과 생태계 활성화를 위한 정책방향에 시사하는 바가 크다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권11호
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• pp.5203-5217
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• 2018

In order to increase the capacity and improve the spectrum efficiency of wireless communication systems, this paper proposes a rate-based two-sided many-to-one matching game algorithm for energy-harvesting small cells with non-orthogonal multiple access (NOMA) in heterogeneous cellular networks (HCN). First, we use a heuristic clustering based channel allocation algorithm to assign channels to small cells and manage the interference. Then, aiming at addressing the user access problem, this issue is modeled as a many-to-one matching game with the rate as its utility. Finally, considering externality in the matching game, we propose an algorithm that involves swap-matchings to find the optimal matching and to prove its stability. Simulation results show that this algorithm outperforms the comparing algorithm in efficiency and rate, in addition to improving the spectrum efficiency.

• 기술혁신연구
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• 제13권1호
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• pp.113-139
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• 2005

The purpose of this study is to analyse the diffusion process of personal computer (PC) in Korea during the 1990's. To achieve the goal, five research steps have been done such as the literature survey of diffusion theory, set-up of theoretic equilibrium model of supply and demand, derivation of an equilibrium path using Hamiltonian, and empirical analysis. The empirical analysis has been performed based on that equilibrium path. The results can be summarized as follows : First, technological attribute of diffusing product influences the diffusion speed of Product. It has been proven that the size of the network has a significant effect on the diffusion of PC in empirical study Second, supply factors have an important role in the diffusion process. According to the empirical analysis, decreasing cost of production as a result of technological advance promotes the speed of diffusion. This point seems to be manifest theoretically, but existing empirical models have not included supply factors explicitly, Third, it has been found out that expectation of decreasing cost would influence the speed of diffusion negatively as expected ex ante. Theoretically this result is supported by arbitrage condition of purchasing timing.

• Asian Journal of Innovation and Policy
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• 제10권2호
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• pp.212-235
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• 2021

In spite of the increasing popularity of the Ricardian model for the study of the impact of climate change on agriculture, there has been few attempts to examine the role of interregional spillovers in this framework and all of them rely on geographical proximity-based weighting schemes. We remedy to this gap by focusing on the spatial externalities of surface water flow used for irrigation purposes and demonstrate that farmland value, the usual dependent variable used in the Ricardian framework, is a function of the climate variables experienced locally and in the upstream locations. This novel approach is tested empirically on a spatial panel model estimated across the counties of the Southwest USA over 1997-2012. This region is one of the driest in the country, hence its agriculture relies heavily on irrigated surface water. The results highlight how the weather conditions in upstream counties significantly affect downstream agriculture, thus the actual impact of climate change on agriculture and subsequent adaptation policies cannot overlook the streamflow network anymore.

• Asia pacific journal of information systems
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• 제20권1호
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• pp.127-140
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• 2010

The benefit that a consumer derives from the use of a good often depends on the number of other consumers purchasing the same goods or other compatible items. This property, which is known as network externality, is significant in many IT related industries. Over the past few decades, network externalities have been recognized in the context of physical networks such as the telephone and railroad industries. Today, as many products are provided as a form of system that consists of compatible components, the appreciation of network externality is becoming increasingly important. Network externalities have been extensively studied among economists who have been seeking to explain new phenomena resulting from rapid advancements in ICT (Information and Communication Technology). As a result of these efforts, a new body of theories for 'New Economy' has been proposed. The theoretical bottom-line argument of such theories is that technologies subject to network effects exhibit multiple equilibriums and will finally lock into a monopoly with one standard cornering the entire market. They emphasize that such "tippiness" is a typical characteristic in such networked markets, describing that multiple incompatible technologies rarely coexist and that the switch to a single, leading standard occurs suddenly. Moreover, it is argued that this standardization process is path dependent, and the ultimate outcome is unpredictable. With incomplete information about other actors' preferences, there can be excess inertia, as consumers only moderately favor the change, and hence are themselves insufficiently motivated to start the bandwagon rolling, but would get on it once it did start to roll. This startup problem can prevent the adoption of any standard at all, even if it is preferred by everyone. Conversely, excess momentum is another possible outcome, for example, if a sponsoring firm uses low prices during early periods of diffusion. The aim of this paper is to analyze the dynamics of the adoption process in markets exhibiting network effects by focusing on two factors; switching and agent heterogeneity. Switching is an important factor that should be considered in analyzing the adoption process. An agent's switching invokes switching by other adopters, which brings about a positive feedback process that can significantly complicate the adoption process. Agent heterogeneity also plays a important role in shaping the early development of the adoption process, which has a significant impact on the later development of the process. The effects of these two factors are analyzed by developing an agent-based simulation model. ABM is a computer-based simulation methodology that can offer many advantages over traditional analytical approaches. The model is designed such that agents have diverse preferences regarding technology and are allowed to switch their previous choice. The simulation results showed that the adoption processes in a market exhibiting networks effects are significantly affected by the distribution of agents and the occurrence of switching. In particular, it is found that both weak heterogeneity and strong network effects cause agents to start to switch early and this plays a role of expediting the emergence of 'lock-in.' When network effects are strong, agents are easily affected by changes in early market shares. This causes agents to switch earlier and in turn speeds up the market's tipping. The same effect is found in the case of highly homogeneous agents. When agents are highly homogeneous, the market starts to tip toward one technology rapidly, and its choice is not always consistent with the populations' initial inclination. Increased volatility and faster lock-in increase the possibility that the market will reach an unexpected outcome. The primary contribution of this study is the elucidation of the role of parameters characterizing the market in the development of the lock-in process, and identification of conditions where such unexpected outcomes happen.

• 벤처창업연구
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• 제9권6호
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• pp.47-64
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• 2014

본고에서는 창조경제하의 주요 특성(네트워크 외부성과 스필오버 효과)을 감안한 이론모형을 구축하고 신용보증 등 정책금융의 효과를 분석한 결과, 창조경제하에서 발생할 수 있는 정보의 비대칭성을 축소시킬 수 있는 인프라 구축과 금융시장의 효율성 제고가 양적 지원 확대 못지않게 중요한 것으로 나타났다. 즉 신용보증제도와 같은 정부의 정책금융이 소기의 성과를 내기 위해서는 시장실패로 인한 자금의 갭을 메우는 것도 중요하지만 창조경제하에서 이와 같은 정보의 비대칭성을 줄일 수 있는 인프라 및 다양한 기제가 혁신기업의 창업 및 성장단계에 따라 필요한 것으로 나타났다. 이러한 것이 구비되지 않았을 경우 정책금융 지원효과는 오히려 시장에 공급되는 금융규모 자체를 줄이거나 오히려 혁신기술의 상용화 가능성을 낮출 것으로 지적되었다. 현재 우리나라의 중소기업금융과 신용보증제도 현황을 살펴본 결과 창조경제 구축에 부합하게끔 정책목표나 방향이 설정되어 있으나 양적인 측면의 공급확대이지 질적인 측면에서 보다 근본적인 정보의 비대칭성 문제 해소에는 미흡한 것으로 평가되었다. 이와 같은 논의 결과를 토대로 창조경제 활성화를 위한 금융지원의 기본방향으로 시장친화적 금융지원정책의 추진과 이를 위한 위험분담 체계의 구축, 관계형 금융 활성화, 중소기업 금융정책의 효율화가 제시되었다. 이러한 기본방향을 전제로 신용보증제도와 관련하여서는 창조경제의 특성이 고위험인 만큼 자칫 이와 같은 공적 지원의 양적 확대가 재정부담으로 작용할 수 있으므로 효율적인 보증제도의 운용 필요성이 제기되었다.

• 한국경영과학회지
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• 제38권3호
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• pp.51-70
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• 2013

This paper develops a model to predict the adoption and level of usage of network technology in a two-level supply chain with buyer-supplier relationships. A firm's adoption of a new technology depends not only on its own beliefs of the new technology's costs and benefits, but also on the adoption decisions of other firms in the supply chain. A model first analyzes an individual supplier's decision about a new technology adoption considering with multiple suppliers and buyers. Individual suppliers' decisions are aggregated with a population model to project how new technology diffuses across the supply chain and examine the pattern of diffusion process. This study found that as more firms adopt in initial periods, the total amount of information to the potential adopters in the population increases, and then the number of firms persuaded by the information increases as the process moves up the distribution of adoption process. We consider three factors influencing the diffusion speed of the new technology in a supply chain network : mean benefits, cost sharing, and information provision. This study examines how such factors affect the reduction of threshold levels, which implies that reductions in threshold levels have an aggregate effect by accelerating the rate of adoption. In particular, we explore relationship factors available in practice in a buyer-supplier relationship and numerically examines how these relationship factors contribute to increase the diffusion speed of the technology in a two-level supply chain.

• 한국콘텐츠학회논문지
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• 제10권2호
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• pp.320-329
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• 2010

소프트웨어 제작자들이 불법복제로부터 그들의 제품을 보호하기 위해 노력하는 것처럼 콘텐츠 제작자들도 사용자간 불법 콘텐츠 공유를 규제하기 위해 노력하고 있다. 본 연구는 이러한 시도가 과연 저작권자의 권익을 보호하고 그들의 수익을 극대화할 수 있는 근본적인 해결책이 될 수 있을 것인지에 대하여 경제적 측면에서 논의한다. 이를 위해 불법 콘텐츠 공유에 대한 규제가 제작자의 수익에 미치는 효과를 파악하기 위한 분석적 모형을 개발하고 규제와 비 규제하에서 콘텐츠 제작자의 수익극대화를 위한 최적 조건을 제시한다. 분석결과, 정품 콘텐츠와 불법 복제 콘텐츠간의 충분한 차별화가 어려운 경우에는 불법 복제의 규제가 긍정적인 효과를 줄 수 있으나 정품 콘텐츠와 불법 복제 콘텐츠 사이에 충분한 차별화가 가능한 경우에는 오히려 규제가 없는 경우에 저작권자의 수익이 극대화되는 것으로 나타났다.

• East Asian Economic Review
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• 제20권2호
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• pp.229-275
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• 2016

We study the effect of the high-skilled emigration rate on the growth rate of the source countries. We incorporate the foreign direct investment and the policy variables into the panel model and also their interactions with the high-skilled emigration rate, as they are related to the network externality that may be created by the high-skilled emigrants working abroad. We apply the static fixed-effects model and compare it with the results obtained in the dynamic panel model with system generalized methods of moments estimators. We find the negative effect of the high-skilled emigration rate by itself and in its interaction with the foreign direct investment only in the dynamic model. However, we find positive coefficient for the interaction of the high-skilled emigration rate and the civil liberties index, which holds across the static and dynamic specifications. This implies that the effect of the high-skilled emigration rate on the growth rate of the source countries can be positive, and the extent is larger for countries with 'poor' civil liberties. The developing countries with low levels of foreign direct investment inflows and 'poor' civil liberties can best benefit from the high levels of skilled emigration outward. Through finding significant interactions with other variables, we confirm that the high-skilled emigration should be considered along with other related variables in measuring its impact on growth. The implications offer suggestions for the international trade and aid policies.