• 전기전자학회논문지
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• 제21권1호
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• pp.66-69
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• 2017

In recent year, energy harvesting technologies from the ambient environments such as light, motion, wireless waves, and temperature again a lot of attraction form research community [1-5] due to its efficient solution in order to substitute for conventional power delivery methods, especially in wearable together with on-body applications. The drawbacks of battery-powered characteristic used in commodity applications lead to self-powered, long-lifetime circuit design. Thermoelectric generator, a solid-state sensor, is useful compared to the harvesting devices in order to enable self-sustained low-power applications. TEG based on the Seebeck effect is utilized to transfer thermal energy which is available with a temperature gradient into useful electrical energy. Depending on the temperature difference between two sides, amount of output power will be proportionally delivered. In this work, we illustrated a low-input voltage energy harvesting circuit applied discontinuous conduction mode (DCM) method for getting an adequate amount of energy from thermoelectric generator (TEG) for a specific wearable application. With a small temperature gradient harvested from human skin, the input voltage from the transducer is as low as 60mV, the proposed circuit, fabricated in a $0.6{\mu}m$ CMOS process, is capable of generating a regulated output voltage of 4.2V with an output power reaching to $40{\mu}W$. The proposed circuit is useful for powering energy to battery-less systems, such as wearable application devices.

• 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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• 제14권4호
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• pp.63-73
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• 2019

최근 청년창업자 및 시니어창업자들의 창업에 대한 관심이 높아지면서, 국내 창업률은 점차적으로 증가하고 있다. 그러나 창업기업의 생존율은 낮아 창업성과가 미비하다. 이에 본 연구에서는 창업성과를 높이기 위한 방안을 찾고자 창업의지가 창업역량요인의 경험역량, 자금조달역량, 마케팅역량 및 차별화경쟁우위를 통해 재무성과 및 비재무성과에 어떠한 영향을 미치는지에 대하여 실증분석하였다. 이를 위해 2019년 1월 21일부터 2월 1일까지 포항지역의 창업가 200명을 대상으로 실시한 설문조사 결과를 가설검증에 활용하였다. 연구결과를 요약하면 다음과 같다. 첫째, 창업의지는 경험역량, 자금조달역량, 마케팅역량에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 경험역량, 마케팅역량은 차별화경쟁우위에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 반면에 자금역량은 차별화경쟁우위에 유의한 영향을 미치지 않는 것으로 나타났는데, 이는 설문대상자의 대부분이 신규사업자라는 분석대상자의 특성이 반영된 결과로 판단된다. 셋째, 차별화경쟁우위는 재무성과, 비재무성과에 정(+)의 영향을 미치는 것으로 나타났다. 결론적으로 본 연구에서는 성공적인 창업성과를 위해서는 창업자의 창업의지 및 창업역량의 자금조달역량, 마케팅역량을 통해 차별화경쟁우위를 확보할 수 있다는 이론적 근거를 제시하고 있으며, 차별화경쟁우위와 창업의 재무성과 및 비재무성과 간에 유의적 관계가 있음을 밝혔다. 또한 창업자의 강한 의지를 바탕으로 새로운 아이디어를 창출하려는 노력을 기울이고, 자금투자 및 마케팅활동을 강화하여, 차별화된 경쟁우위를 확보하려는 지속적인 노력이 경영성과를 위해 필요하다는 중요한 의미를 창업자 및 경영실무자에게 제시하고 있다.