• 한국의류학회지
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• 제46권5호
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• pp.741-759
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• 2022

This study examines the effect of live commerce characteristics on consumption behavior mediated by presence. As contactless shopping has become the new normal, live commerce is emerging as an innovative communication service between consumers and sellers. We examine the role of interaction and streamers' attributes on sharing and purchase intention by mediating social presence and telepresence. A web-based experiment was conducted to test our hypotheses. The data of 267 participants were analyzed using SPSS 23.0 and AMOS 21.0. The results showed that the Streamer-Consumer interaction had a positive effect on social presence and telepresence. By contrast, the Consumer-Consumer interaction had no significant effect on social presence and telepresence. We further found that streamer trustworthiness had a positive effect on both social presence and telepresence, while streamer attractiveness had a positive effect only on telepresence. Thus, social presence and telepresence positively influenced sharing and purchase intention. Overall, these findings illustrate that the Streamer-Consumer interaction and streamer trustworthiness are vital characteristics that lead to higher levels of presence using live commerce. Several academic and managerial implications are suggested based on these results.

• 한국환경과학회지
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• 제12권12호
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• pp.1261-1267
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• 2003

On the basis of the distribution of particle size measured by laser diffraction spectrometers, this research was carried out to investigate the characteristics of mist removal with the change of operating condition in the plasma reactor of impulse streamer corona. The operating parameters in this experiment were power of impulse streamer corona, gas velocity, impulse generation time, gas temperature, and SOx/NOx concentration. The collection efficiency T(d) was estimated by the distribution of particle size in the collection zone through the advanced model.

• 환경위생공학
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• 제14권4호
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• pp.69-76
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• 1999

This research was carried but to investigate the characteristics of mist removal with the change of operating conditions in the plasma reactor of impulse streamer corona based on the distribution of particle size measured by laser diffraction spectrometers. The operating conditions in this experiment were power of impulse streamer corona, gas velocity, collection time, and SOx/NOx concentration. The collection efficiency T(d) was estimated by distribution of particle size in the collection zone through the advanced model.

• Journal of Electrical Engineering and Technology
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• 제5권2호
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• pp.329-336
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• 2010

The paper describes the electrical and optical properties of underwater discharges in highly inhomogeneous electric fields caused by 1.2/50 ${\mu}s$ impulse voltages as functions of the polarity and amplitude of the applied voltage, and various water conductivities. The electric fields are formed by a point-to-plane electrode system. The formation of air bubbles is associated with a thermal process of the water located at the tip of the needle electrode, and streamer coronas can be initiated in the air bubbles and propagated through the test gap with stepped leaders. The fastest streamer channel experiences the final jump across the test gap. The negative streamer channels not only have more branches but are also more widely spread out than the positive streamer channels. The propagation velocity of the positive streamer is much faster than that of the negative one and, in fact, both these velocities are independent of the water conductivity; in addition the time-lag to breakdown is insensitive to water conductivity. The higher the water conductivity the larger the pre-breakdown energy, therefore, the ionic currents do not contribute to the initiation and propagation of the underwater discharges in the test conditions considered.

• International Journal of Safety
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• 제5권2호
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• pp.18-23
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• 2006

Studies have claimed that ESE (Early Streamer Emission) air terminals offer a vastly increased zone of protection over that of traditional lightning rods (Franklin rods) by causing the emission of an upward streamer/leader: The upward streamer/leader will propagate towards the tip of the downward leader at an early stage in the attachment process.. This paper shows the results of a performance evaluation test of a particular type of the ESE air terminal (called "ElecHippo") with a simple rod tested at the Korea Electrotechnology Research Institute (KERI). The corona emission current of the ElecHippo made by Yong-Jin Enterprise Corp. has also been measured at the Occupational Safety & Health Research Institute (OSHRI). The results show that the ElecHippo meets the French standard of NFC 17-102-1995. The results also verify the ESE performance by measuring the ion emission current generated in the discharge electrode gap as a function of the capacitance and inductance of the equipped devices. Finally, we propose a new method for grounding the system to reduce the lightning damage by combining the ESE air terminal, the early discharge earth plate, the lightning strike recorder and the surge protection device.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 가을 학술발표논문집 Vol.28 No.2 (3)
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• pp.775-777
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• 2001

스트리밍 서버의 대역폭 부담으로 인해 멀티캐스트 스트리밍이 개발되었지만 이는 서비스제공자가 정한 일정에 따라 일방적으로 방송을 청취하게 된다는 단점이 있다. 이러한 단점을 보완하기 위해 Partitioned Broadcast를 통해 VCR기능을 제공하는 연구가 진행되었다. 그러나 기존의 방법은 전체 네트웍의 트래픽을 많이 사용하게 되는 문제점이 있었다. 본 논문에서는 Partitioned Broadcast Streamer의 개념을 제시하고 이를 구현해 봄으로서 전체 네트웍의 대역폭을 절약하면서 멀티캐스트 라이브 스트림상에서 VCR기능을 제공할 수 있는 방안을 제시한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2000년도 추계학술대회 논문집 학회본부 C
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• pp.559-561
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• 2000

In this paper we present not only propagation of streamer but also chemical processes in air. The results of two-dimensional simulation are that chemical species have different densities in spatial domain and temporal domain. We show that photoionization plays important roles in streamer propagation and chemical reactions.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1997년도 하계학술대회 논문집 E
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• pp.1785-1787
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• 1997

This paper involves corona using the streamer theory. We are modelling a point-to-plane electrodes and this is first stage to model the electrostatic precipitator. Then here theoretical grounds of streamer were used.

• 대한전기학회논문지:전기물성ㆍ응용부문C
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• 제48권3호
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• pp.200-208
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• 1999

In this paper, the corona discharge is analyzed by Finite Element Method(FEM) combined with Flux-corrected Transport(FCT) algorithm. In the previous papers, Finite Difference Method(FDM) combined with FCT was used. Usually in the FDM, the regionof interest is discretized with structured grids. But to refine local regions with same resolution, much more grids are required for the structured grids than for unstructured grids than for unstructured grids. Therefore, we propose the FEM-FCT method to simulate the corona discharge. The proposed method has good flexibility in model shape and can reduce the computational cost by the local refinement where the physical quantities have steep gradients. Using the proposed method, we study the streamer growth of parallel plate electrodes which is initiated by the low and high perturbation density. We find that the varying the initial density of perturbation has very little effect on the streamer propagation. And the corona discharge of the rod-to-plane electrode is simulated. On the surface of the rod electrode, the high concentration of the electric field gives rise to many number of streamer seeds. The strong axial streamer propagate to the plane electrode. The weaker non-axial streamer repel each other and stop growing more. The results are very similar to those of the papers which used the FDM-FCT method on structured grids. Thus we can conclude that the proposed FEM-FCT method is more efficient than the conventional FDM-FCT method by virtue of the reduction in computational grids number.

• 조명전기설비학회논문지
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• 제22권8호
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• pp.67-74
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• 2008

이 논문은 수중의 침 대 평판 전극에서 임펄스전안의 크기와 극성, 물의 저항률 등과 같은 다양한 조건에 따른 방전특성을 나타낸다. 스트리머코로나가 침전극 끝단에서 발생하며 평판전극을 향하여 진전하여 최종적으로 전극 사이가 섬락에 이르게 된다. 동일한 전압에서 물의 저항률이 작을 때 스트리머코로나의 분기로는 물의 저항률이 클때 보다 더욱 굵고 밝게 나타났다. 정극성에 비해서 부각성 스트리머코로나가 더욱 많은 분기로를 형성하며 더욱 넓게 퍼지는 것으로 나타났다. 스트리머코로나의 개시 후 방전의 진전과 더불어 수 백 [mA]에서 수 [A]에 이르는 많은 수의 전류펄스가 발생하였다. 정극성의 절연파괴까지의 지연시간은 부극성에 비하여 매우 짧았으며, 전극에 공급되는 전구방전에너지는 물의 저항률에 반비례하였다.