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가상대조집단을 활용한 코로나19가 개별 관광지의 관광 수요에 미치는 영향 분석 방안
양원석,전계형,이상민 사단법인 한국비즈니스이벤트컨벤션학회 2024 이벤트 컨벤션 연구 Vol.20 No.2
Purpose– This study presented a method to analyze the impact of nationwide socioeconomic events, like COVID-19, on demand changes in individual tourist areas. Design, data, and methodology– Empirical analysis was carried out using the tourist statistics from the Korea Tourism Knowledge & Information System. The study presented an analytical methodology utilizing a hypothetical comparison group, time series forecasting, and performance evaluation methods in machine learning. Result–The empirical analysis of 117 tourist areas in Seoul, Incheon, Gyeonggi-do, and Gangwon-do showed that, at a statistically significant level, 39% of the tourist areas experienced a decrease in demand, while 57% showed no change in demand. Conclusions – This study introduced a method to estimate and test the individual impact of events without comparison group data, and validated its effectiveness by analyzing demand changes at tourist areas during the COVID-19 pandemic.
요구사항으로부터 기능점수를 측정하기 위한 체계적인 방법
양원석,박수용,최순황,정창해,황만수,Yang, Won-Seok,Park, Su-Yong,Choe, Sun-Hwang,Jeong, Chang-Hae,Hwang, Man-Su 한국시스템엔지니어링협회 2004 시스템엔지니어링워크숍 Vol.4 No.-
Our research proposes how to, systematically, count function point from initial functional requirements based on natural language. Gradually, Function Point Analysis is used to overcome the limitation of LOC(Line Of Code) for estimating software size. Moreover, it plays an important role in cost management. Function point is derived from initial requirements and is determined by experts who have an education for function point. However, currently there are few researches to cout function point by systematic or automatic rules. Through extending our porposed method, we expect that function point is able to be counted automatically or semi-automatically. This would be our future research
전기히터식 및 지열원 히트펌프식 농산물 열풍건조기의 에너지 성능 비교
양원석,김영일,박승태 한국 지열 · 수열에너지학회 2018 한국지열에너지학회논문집 Vol.14 No.4
Energy performance of electric heater and geothermal source heat pump type hot air dryers arecompared in this study. For set temperatures of 30℃, 35℃ and 40℃, radish is dried from initial mass60 kg until it gets 5 kg, where the difference equals the amount of water removed. As set temperatureis increased, drying time is shortened for both electric heater and heat pump types, however energyefficiency is decreased due to increasing electricity consumption. Moisture extraction rate(MER) ofelectric heater is 2.58~2.84 kg/h, and for heat pump type 2.56~2.71 kg/h, showing little differencebetween the two types. Specific moisture extraction rate (SMER) of electric heater is 0.94~0.96 kg/kWh, and for heat pump type 1.72~2.21 kg/kWh. SMER of heat pump type is greater by 0.78~1.25kg/kWh than the electric heater hot air dryer, which is 1.8~2.3 times better in terms of energy efficiency.
부산 영도 내만에서 식물플랑크톤 군집의 주간 변동 특성
양원석,최동한,원종석,김지훈,현명진,이하은,이연정,노재훈,YANG, WONSEOK,CHOI, DONG HAN,WON, JONGSEOK,KIM, JIHOON,HYUN, MYUNG JIN,LEE, HAEUN,LEE, YEONJUNG,NOH, JAE HOON 한국해양학회 2021 바다 Vol.26 No.4
연안역에서 나타나는 식물플랑크톤 군집의 연중 변동 특성을 확인하기 위하여, 일 년여간 부산 영도 내만의 고정점에서 생물량 및 다양성을 매주 조사하였다. 연구 해역은 엽록소 a가 0.43~7.58 mg m<sup>-3</sup> 범위를 나타내어 중영양에서 부영양 특성을 나타내었다. 조사 기간 동안 엽록소 a 중 3 ㎛ 이상 크기의 식물플랑크톤이 차지하는 비율은 평균 80% 내외를 차지하여 높았다. 이들 3 ㎛ 이상 크기의 식물플랑크톤에서는 규조류(Bacillariophyta)가 봄과 여름에 가장 우점하였으며, 가을과 겨울에는 은편모조강(Cryptophyceae)이 우점하였다. 반면, 3 ㎛ 이하 크기의 초미소식물플랑크톤에서는 마미엘라강(Mamiellophyceae)이 대부분의 시기에 가장 우점하였으며, 은편모조강(Cryptophyceae)이 연중 평균(+표준편차) 17.7 ± 17.6%로 비교적 높았으나 계절적 변동이 컸다. 와편모조강(Dinophyceae)은 드물지만 60.4%까지 매우 높게 우점하기도 하였다. 본 연구에서 13개월 간 일주일 간격의 정기 관측을 통해 육지에 인접한 천해 연안 식물플랑크톤 군집이 짧은 시간 규모에서 변동함을 파악할 수 있었다. 이러한 지속적인 고정점 관측은 식물플랑크톤의 단·장기 변동 특성과 기후 및 환경 변화의 영향을 이해하는 데 중요한 자료를 제공할 수 있을 것이다. To understand the temporal variation of phytoplankton communities in a coastal area, the biomass and diversity were weekly investigated in the inner bay of Yeong-do, Busan. In the study area, chlorophyll a concentration ranged from 0.43~7.58 mg m<sup>-3</sup> during the study, indicating the study area was in mesotrophic or eutrophic status. The fractions of chlorophyll a occupied by large phytoplankton (> 3 ㎛ diameter) exhibited an average of 80% of total chlorophyll a in this study. Among the large phytoplankton, while Bacillariophyta was the most dominant in spring and summer, Cryptophyceae prevailed in the fall and winter. On the contrary, in the picophytoplankton community less than 3 ㎛ in diameter, Mamiellophyceae was the most dominant in most seasons, Cryptophyceae was relatively high with an average of 17.7 ± 17.6% throughout the year, but seasonal variations were large. Dinophyceae rarely occupied a higher fraction up to 60.4% of the picophytoplankton community. By weekly monitoring at a coastal station for 13 months, it is suggested that phytoplankton communities in coastal waters could be changed on a short time scale. If data are steadily accumulated at the time-series monitoring site for a long time, these will provide important data for understanding the long-term dynamics of phytoplankton as well as the impact of climate and environmental changes.
양원석,김남기 대한산업공학회 2017 Industrial Engineeering & Management Systems Vol.16 No.3
In this paper, we deal with the economic operation of a data backup scheme for various computer systems under disastrous information threats. To this end, we introduce a queueing model that combines disasters and two-stage queues. Making use of the matrix-geometric approach, we obtain its steady-state probabilities. From these results, we compute the average total cost with a recovery cost and a backup cost taken into account. With sample numerical results, we investigate the optimal backup operation that minimizes the average total cost.