• 벤처창업연구
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• 제10권3호
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• pp.15-26
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• 2015

본 연구의 목적은 국내에서 활발히 시행되고 있는 기업가정신 정책(entrepreneurship policy)에 대한 이론적 기반을 제공하는 것이다. 먼저 기업가정신 정책은 기업가적 과정에 정부가 개입하는 활동으로, 기업가정신을 가진 개인들의 공급을 증가시키고 그들의 창업활동을 지원하는 정책으로 정의하고, 이를 벤처기업정책 및 중소기업정책과 구분한다. 기업가정신 정책의 경제적 당위성과 관련하여서는 기업가 시장(market for entrepreneur)의 개념을 상정하고, 시장실패의 관점에서 정부의 개입 필요성을 도출하며, 정책수립의 원칙을 제시한다. 또한 기업가적 과정을 토대로 하여 기업가정신 정책의 틀을 모형화 하고, 정책영역별 파급경로(transmission channel)를 파악한다. 기업가정신 정책의 파급경로는 (1) 수요측면, (2) 공급측면, (3) 창업의사결정, (4) 자원조달 등이다. 마지막으로 각 정책영역 및 파급경로별로 구체적인 정책수단 혹은 프로그램들을 유형화하고, 이 기준에 따라서 실제로 우리나라에서 수행되고 있는 기업가정신 정책들을 분류한다. 하지만 본 연구는 기업가정신 정책에 대한 실험적인 경제 분석이므로 기업가정신 정책에 대한 연구목적이나 정책수립목표에 따라서 접근방법 및 내용이 달라질 수 있다.

• 경제분석
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• 제27권4호
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• pp.43-69
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• 2021

한국은 중국과의 교역 규모가 큰 데다 금융부문의 연계성 또한 점차 강화되고 있어 중국 통화정책 변화가 다양한 경로를 통해 한국 경제에 파급영향을 미치고 있다. 이에 본 연구는 중국 통화정책 운영상의 특징과 최근 운영 현황을 살펴보고, VAR 모형을 이용하여 중국 통화정책 변화가 한국 경제에 미치는 영향과 파급경로에 대해 분석하였다. 중국 통화정책 변화의 파급경로를 대중 수출 및 무역수지 등 한국 교역변수(무역경로)와 이자율, 주가, 물가 등 금융변수(금융경로, 원유가격경로)에 미치는 영향으로 나누어 분석한 결과, 중국 통화정책 완화 충격은 무역경로 중 수직적 무역통합 경로를 통해 한국의 대중 중간재 수출을 증가시킨 것으로 나타났다. 반면 지출전환 경로와 소득수요 경로는 유의하지 않은 것으로 나타났다. 금융경로 및 원유가격경로에서는 글로벌 투자자금 흐름 재조정, 금리차 및 원자재가격 변동 등을 통해 중국 통화정책 완화 충격이 한국 금리 하락과 주가 및 물가 상승을 유발하는 것으로 나타났다.

• Journal of Communications and Networks
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• 제16권3호
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• pp.293-300
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• 2014

As energy harvesting communication systems emerge, there is a need for transmission schemes that dynamically adapt to the energy harvesting process. In this paper, after exhibiting a finite-horizon online throughput-maximizing scheduling problem formulation and the structure of its optimal solution within a dynamic programming formulation, a low complexity online scheduling policy is proposed. The policy exploits the existence of thresholds for choosing rate and power levels as a function of stored energy, harvest state and time until the end of the horizon. The policy, which is based on computing an expected threshold, performs close to optimal on a wide range of example energy harvest patterns. Moreover, it achieves higher throughput values for a given delay, than throughput-optimal online policies developed based on infinite-horizon formulations in recent literature. The solution is extended to include ergodic time-varying (fading) channels, and a corresponding low complexity policy is proposed and evaluated for this case as well.

• Journal of Communications and Networks
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• 제14권2호
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• pp.121-129
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• 2012

In this paper, we consider a source node that operates over a time varying channel with energy harvesting capability. The goal of the source is to maximize the average number of successfully delivered packets per time slot. The source is able to choose whether to transmit a packet or defer the transmission in each time slot. The decision which is chosen by the source depends on the channel information available and the length of the energy queue. We formulate the problem of finding the optimal policy as a Markovian decision problem. We show some properties of the value function that represents the discounted number of successfully delivered packets per time slot. We prove that the optimal policy is a threshold type policy depending on the state of the channel and the length of the energy queue. We also derive an upper bound for the average number of packets per time slots successfully received by the destination. We show using numerical results that this bound is a tight bound on the performance of the optimal policy. And we consider the case of time varying channel but without channel state information (CSI). Then, we study the impact of channel time varying nature and the availability of CSI. In this case, we show that the optimal policy is a greedy policy. The performance of this greedy policy is also calculated.

• 수산경영론집
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• 제51권4호
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• pp.69-83
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• 2020

The purpose of this paper is to empirically investigate whether asymmetric price transmission exists in the distribution stage of farmed olive flounder market. For the analysis, time series data were used for the producer prices of Jeju and Wando, and the wholesale prices of Incheon, Hanam and Busan. Through the Granger causality test, the causal relationship from the producer price to the wholesale price was derived and the asymmetric price transmission was analyzed using the autoregressive distributed lag model (ARDL). As a result of the analysis, it was found that there is a phenomenon of 'positive asymmetric price transmission' from the producer price to the wholesale price. This result can be one evidence that excess profits are received in the intermediate distribution stage, and can be said to be a result showing the incompleteness and inefficiency of the distribution structure of the farmed olive flounder. In the future, it is required to establish an information-sharing system in all stages of production, distribution, and consumption that can create a competitive environment for distribution participants and resolve information asymmetry. Also, it is necessary to review the distribution center specializing in live fish from the viewpoint of the establishment of new distribution channels and sales diversification strategy under the rapidly changing fisheries environment.

• Journal of Korea Trade
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• 제24권4호
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• pp.1-17
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• 2020

Purpose - Since China has been South Korea's biggest export destination, uncertainty shocks originating from it would influence South Korea's exports. This paper evaluates the effects of China's economic policy uncertainty on Korea's exports to explore the transmission channels. Design/methodology - Incorporating endogeneities and nonlinearities, this study employs a quarterly time-varying parameters vector autoregressive model to investigate the relationships between China's economic policy uncertainty and Korea's exports, where the overparameterization due to time-varying specifications is overcome by a novel stochastic model specification search framework. According to previous theoretical studies, this paper assesses two channels, demand shock channel and exchange rate channel, through which foreign uncertainty affects Korea's exports. This paper identifies the primary drivers of Korea's aggregate exports and analyzes the rationales for the time-variant impacts of China's economic policy uncertainty on Korea's exports to China. Findings - Our empirical results reveal that Korea's aggregate exports are less responsive to China's economic policy uncertainty shocks and significantly move together with global demand. In contrast, its bilateral exports to China are highly responsive in a negative and time-variant way. Moreover, Chinese investment is an important channel through which China's economic policy uncertainty affects Korea's exports to China after 2010. Further, the time-variant effects of China's economic policy uncertainty on Korea's exports to China are related to changes in China's foreign trade policies, global economic conditions, and China's degree of economic freedom. Originality/value - Few previous studies touch the effects of external uncertainty shocks on South Korea's exports. This paper attempts to fill this gap and explicitly investigate the impacts of China's economic policy uncertainty on Korea's exports from a time-varying perspective. As Korea is an export-oriented economy, this study provides insights for the Korean government to understand the transmissions of external uncertainty better.

• Journal of Communications and Networks
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• 제14권5호
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• pp.495-500
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• 2012

A standard paradigm for the allocation of wireless resources in communication demands symmetry, whereby all users are assumed to be on equal footing and hence get equal shares of communication capabilities. However, there are situations in which "prime users" should be given higher priority, as for example in the transmission of emergency messages. In this paper, we examine a prioritization policy that can be implemented at the physical layer. In particular, we evaluate the performance of a prioritized transmission scheme based on spectrum pooling and on the assignment of higher signal-to-noise ratio channels to higher-priority users. This performance is compared to that of unprioritized (or "symmetric") schemes, and the impact of prioritization on the unprioritized users is discussed.

• Asian Journal of Innovation and Policy
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• 제5권2호
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• pp.185-196
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• 2016

A digital cable broadcasting service is a multimedia broadcasting service that provides high definition and various supplementary services by using digital transmission. Korea implemented a complete digital broadcasting service by 2012. This study applied a choice experiment to investigate consumer preferences, and it calculated the marginal willingness to pay for this service. Moreover, we employed a multinomial probit model to relax the assumption that all respondents have the same preference for attributes being valued. The results suggest that respondents value channels, definition, video-on-demand (VOD) service, pay-per-view (PPV) service, and commerce based on TV (T-commerce). On the other hand, online gaming may be less important as an attribute for digital cable broadcasting service in Korea.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권10호
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• pp.4034-4053
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• 2015

In order to meet various requirements for transmission quality of both primary users (PUs) and secondary users (SUs) in cognitive radio networks, we introduce a channel bonding mechanism for PUs and a channel reservation mechanism for SUs, then we propose a novel spectrum allocation strategy. Taking into account the mistake detection and false alarm due to imperfect channel sensing, we establish a three-dimensional Markov chain to model the stochastic process of the proposed strategy. Using the method of matrix geometric solution, we derive the performance measures in terms of interference rate of PU packets, average delay and throughput of SU packets. Moreover, we investigate the influence of the number of the reserved (resp. licensed) channels on the system performance with numerical experiments. Finally, to optimize the proposed strategy socially, we provide a charging policy for SU packets.

• 방송공학회논문지
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• 제23권6호
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• pp.824-835
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• 2018

본 연구에서는 8VSB가 도입된 후 케이블TV 가입자 수와 케이블 TV 사업자의 수익에 미친 영향을 살펴보고, 디지털방송 시청권 확대 및 시청자 복지에 준 영향을 알아보았다. 이를 위해 케이블TV 사업자의 아날로그 및 8VSB 상품 가입자 수 및 수익의 추이와 사업자별로 제공되는 채널 수의 변화를 토대로 분석하였다. 연구결과, 8VSB 전환을 통해 케이블 사업자의 아날로그 가입자 및 디지털 가입자 이탈이 늦춰지고 있으며, VOD 시청료와 홈쇼핑 송출 수수료 수익이 영업 이익에 유의미한 영향을 주는 것으로 나타났다. 8VSB 가입자는 동일한 요금으로 더 많은 채널들을 깨끗한 화질로 시청할 수 있는 계기가 되었고 PP도 더 많은 고객들에게 프로그램을 제공할 수 있게 되었다. 방송환경의 변화에 따른 정부의 규제 완화로 인해 유료방송의 디지털 전환이 족진되고 시청자 후생이 증진되었다.