• International Journal of Internet, Broadcasting and Communication
• /
• 제15권4호
• /
• pp.342-350
• /
• 2023

The purpose of this study is to find out how the perceived waiting time of viewers of e-sports games affects negative emotions and how these negative emotions affect viewing satisfaction, viewing attitude, and continuous viewing intention. To achieve the purpose of this study, 200 viewers who watched e-sports games more than two to three times were targeted. 197 copies were selected as the final valid sample after excluding three of the collected questionnaires that showed unfaithful answers. For data processing methods, confirmatory factor analysis, reliability analysis, and structural equation model analysis were conducted using SPSS 27 and AMOS 25. Through this, the following results were obtained. First, it was found that the perceived waiting time of the viewer had a significant effect on the viewers' negative emotions in the event of a game pause. Second, viewers' negative emotions were found to have a significant effect on viewing attitudes, but not on viewing satisfaction. Third, it was found that viewing attitude had a significant effect on viewing satisfaction and continuous viewing intention. Fourth, it was found that viewing satisfaction had a significant effect on continuous viewing intention. In other words, the more acceptable and shorter the perceived waiting time due to the suspension of the game pause, the lower the negative emotions of the viewers, and the negative emotions of the viewers ultimately affect the intention to continue watching through viewing attitude and viewing satisfaction.

• 정보처리학회논문지A
• /
• 제8A권3호
• /
• pp.217-226
• /
• 2001

본 논문은 클러스터 기반의 분산 구조를 갖는 CCMSS(Clustered Continuous Media Storage Server) 시스템의 미디어 검색 동작에 대해 디스크의 입출력 지연 시간 뿐맘 아니라 내부 네트워크의 통신 지연 시간을 함께 고려한, 열린 큐잉 네트워크 기반의 해석적 모델을 제시하고 이를 이용하여 전체 서비스 지연 시간에 대한 확률적 모델을 정의한다. 그리고 정의된 확률적 모델을 바탕으로 허용된 서비스 실패율 범위에서 최대 서비스 가능한 사용자 요구 수를 구하고 이 값을 이용하여 승인 제어를 수행하는 통합형 통계적 승인 제어 모델을 제안한다. 제안된 승인 제어 기법의 성능 분석을 위해 단순히 디스크 성능만을 고려한 확률적 모델과 본 논문에서 제안한 디스크 성능과 내부 네트워크의 성능을 함께 고려한 확률적 모델을 통해 산출한 마감시간 실패율과 실제 클러스터 기반 서버 환경에서 모의 실험을 통해 얻은 결과를 비교하였으며, 실험 결과에 대한 분석을 통해 제안된 승인 제어 기법이 CCMSS 시스템의 실제 서비스 지연 요소를 정확히 반영하고 있다는 것을 알 수 있었다.

• 한국안전학회지
• /
• 제18권1호
• /
• pp.64-70
• /
• 2003

For the unconfined vapor cloud explosion(UVCE) accident by the continuous release of gas-liquid flow of various saturated liquids in a vessel at ground level, overpressures were estimated by TNT equivalency model with two estimation methods, such as UVCE I model based on a constant release time and UVCEII model based on a real travel time of vapor by dispersion and analyzed with various release conditions. As a simulation result the simple, easy, and correct method of evaluation of consequences of the UVCE accident was proposed by using consequences of UVCE I model and correlation equations for differences of overpressures between UVCE models, so that this evaluation method could be used easily in the small and medium size enterprises without using the dispersion model.

• 대한수학회지
• /
• 제58권1호
• /
• pp.45-67
• /
• 2021

In this paper, a mathematical dynamical system involving both deterministic (with or without delay) and stochastic "SIR" epidemic model with nonlinear incidence rate in a continuous reactor is considered. A profound qualitative analysis is given. It is proved that, for both deterministic models, if ��d > 1, then the endemic equilibrium is globally asymptotically stable. However, if ��d ≤ 1, then the disease-free equilibrium is globally asymptotically stable. Concerning the stochastic model, the Feller's test combined with the canonical probability method were used in order to conclude on the long-time dynamics of the stochastic model. The results improve and extend the results obtained for the deterministic model in its both forms. It is proved that if ��s > 1, the disease is stochastically permanent with full probability. However, if ��s ≤ 1, then the disease dies out with full probability. Finally, some numerical tests are done in order to validate the obtained results.

• KDI Journal of Economic Policy
• /
• 제40권4호
• /
• pp.1-22
• /
• 2018

We estimate three continuous-time stochastic volatility models following the approach by Aït-Sahalia and Kimmel (2007) to compare the Korean and US stock markets. To do this, the Heston, GARCH, and CEV models are applied to the KOSPI 200 and S&P 500 Index. For the latent volatility variable, we generate and use the integrated volatility proxy using the implied volatility of short-dated at-the-money option prices. We conduct MLE in order to estimate the parameters of the stochastic volatility models. To do this we need the transition probability density function (TPDF), but the true TPDF is not available for any of the models in this paper. Therefore, the TPDFs are approximated using the irreducible method introduced in Aït-Sahalia (2008). Among three stochastic volatility models, the Heston model and the CEV model are found to be best for the Korean and US stock markets, respectively. There exist relatively strong leverage effects in both countries. Despite the fact that the long-run mean level of the integrated volatility proxy (IV) was not statistically significant in either market, the speeds of the mean reversion parameters are statistically significant and meaningful in both markets. The IV is found to return to its long-run mean value more rapidly in Korea than in the US. All parameters related to the volatility function of the IV are statistically significant. Although the volatility of the IV is more elastic in the US stock market, the volatility itself is greater in Korea than in the US over the range of the observed IV.

• 한국습지학회지
• /
• 제5권1호
• /
• pp.67-78
• /
• 2003

The unsteady 2D convection and diffusion equation is solved numerically for the real-time simulation of suspended load propagation. The streamlined upwind scheme efficiently reduces numerical oscillations due to the high Peclet number in the convection dominant flow. By using the mixed boundary condition to express the external source terms or externally induced suspended load as a function of time in the algorithm, the model is capable of handling not only continuous load cases but also non-continuous suspended load influx. The suspended load transport modelwas verified using a case study for which an analytical exact solution is available and was applied to the real-time simulation of a suspended load influx case on the Mississippi River. The model algorithm can provide a framework upon which water quality as well as contaminant transport models can be built.

• 한국지능시스템학회논문지
• /
• 제15권3호
• /
• pp.318-323
• /
• 2005

본 논문에서는 불확실성을 포함한 연속시간 비선형 동적 시스템에 대한 퍼지 모델 기반 제어기의 지능형 디지털 재설계를 위한 조직적인 방법을 제안한다. 불확실 비선형 시스템을 표현하기 위해 연속시간 불확실 TS 퍼지 모델이 구성된다. 그리고, 안정화와 추적을 위한 퍼지 모델 기반 제어기 설계를 위해 PDC 기법이 이용된다. 마지막으로, 설계된 연속시간 제어기는 지능형 디지털 재설계 기법을 이용함으로써 이산시간 제어기로 전환됨을 증명하는 방법을 제안한다. 이 새로운 설계 기법은 퍼지 모델 기반 제어 이론과 불확실성을 가진 비선형 동적 시스템에 대한 진보된 디지털 재설계 기법의 통합을 위한 조직적이고, 효과적인 틀을 제공한다 마지막으로, 단일 링크 유연 로봇 시스템의 모의 실험을 이용해 개발된 설계 방법의 효용성과 실행 가능성을 입증한다.

• 한국지능시스템학회:학술대회논문집
• /
• 한국퍼지및지능시스템학회 2005년도 추계학술대회 학술발표 논문집 제15권 제2호
• /
• pp.125-128
• /
• 2005

This paper presents a simple methodolosy that makes a continuous-time nonlinear system chaotic using fuzzy control. The nonlinear system is represented by the T-S fuzzy model. Then, a fuzzy controller makes the T-S fuzzy model, which could be stable or unstable, bounded and chaotic. The verification of chaos in the closed-loop system is done by the following procedures. We establish an asymptotically approximate relationship between a continuous-time T-S fuzzy system with time-delay and a discrete-time T-S fuzzy system. Then, we verify the chaos in the closed-loop system by applying the Marotto theorem to its associated discrete-time T-S fuzzy system.

• 대한전기학회논문지
• /
• 제36권9호
• /
• pp.660-669
• /
• 1987

Routh approximation method is the most computationally attractive. But this method may cause time-response error because this method does not match the time-response directly. In this paper a new mixed method for obtaining stable reduced-order models for high-order continuous-time systems is proposed. It makes use of the advantages of the Routh approximation method and the Minimization of Integral Squared Error(MISE) criterion approach. In this mixed method the characteristic polynomial of the reduced-order model is first obtained from that of original system by using the Auxiliary Denominator Polynomial(ADP). The numerator polynomial is then determined so as to minimize the intergral squared-error of unit step responses. The advantages of the propsed method are that the reduced models are always stable if the original system are stable and the frequency domain and time domain characteristic of the original system will be preserved in the reduced models.

• 디지털융복합연구
• /
• 제19권12호
• /
• pp.413-425
• /
• 2021

본 연구는 이용과 충족접근, 기술수용모델을 통합 적용하여 유튜브 '먹방'콘텐츠 이용동기와 지속이용의도를 살펴보았다. 본 연구에서는 유튜브 '먹방' 콘텐츠 이용자 358명을 대상으로 설문조사를 통해 SPSS 21.0 프로그램과 AMOS 21.0 프로그램을 활용, 탐색적/확인적 요인분석과 경로분석 등을 실시하여 핵심 결과를 도출하였다. 결과를 제시하면, 첫째, 유튜브 '먹방' 콘텐츠 이용 동기 중 정보추구 동기와 스트레스 해소 동기, 시간보내기 동기는 인지된 유용성에, 정보추구 동기와 시간보내기 동기는 인지된 용이성에 정적 영향을 미쳤다. 둘째, 정보추구 동기, 스트레스 해소 동기, 시간보내기 동기는 공통적으로 인지된 즐거움과 인지된 독창성에 정적 영향을 미쳤다. 셋째, 인지된 즐거움은 인지된 용이성에는 정적 영향을 미쳤다. 넷째, 인지된 즐거움과 인지된 독창성은 모두 지속이용의도에 정적 영향을 미쳤다. 다섯째, 인지된 용이성은 인지된 유용성에 대해 정적 영향을 미쳤으며, 인지된 용이성과 인지된 유용성 모두 지속이용의도에 정적 영향을 미쳤다. 본 연구는 이용과 충족접근, 기술수용모델을 통합 적용하여 유튜브 '먹방' 콘텐츠의 지속이용을 파악할 수 있는 모델을 정교화하였다는 점에서 학술적 의의가 있을 것이다. 후속연구에서는 유튜브 '먹방' 콘텐츠의 지속이용의도 관련 모델의 정교화를 위해 다양한 이론과 모델들을 통합 적용해 볼 필요가 있을 것이다.