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Power-to-Gas 기반 섹터커플링 시스템 구축을 위한 대중의 지불의사액
김준규(Joon-Kyu Kim),김주희(Ju-Hee Kim),유승훈(Seung-Hoon Yoo) 한국에너지학회 2024 에너지공학 Vol.33 No.1
The government is considering the introduction of sector coupling as a way to compensate for the instability of the power system and solve the power generation constraints caused by the shortage of the power grid. In particular, the government intends to introduce Power-to-Gas (P2G), which uses surplus power to generate hydrogen. This study seeks to evaluate public acceptance of introducing P2G by using contingent valuation method (CV). For this purpose, CV survey was conducted through person-to-person interviews targeting 1,000 households in South Korea. At this time, the annual income tax per household and the one-and-one-half bounded dichotomous choice model (OOHB) were adopted as payment vehicle and willingness to pay (WTP) elicitation methods, respectively. In addition, a single bounded model (SB) is applied to examine the response effects that may occur in the OOHB model. In both models, the spike model is used to handle many zero WTPs. As a result, the estimation results of the SB spike model were adopted and the average annual WTP per household for the P2G project was estimated to be KRW 5,317. The total WTP for the project was derived at KRW 117.1 billion per year, and the present value of the total benefits generated over the decade totaled KRW 926.5 billion as of 2021. Comparing the total benefit derived in this study with the cost involved in the project to be evaluated, the benefit/cost ratio is calculated as 1.99. Therefore, the project was found to secure economic feasibility.
더러브렛 경주마에서 혈청 젖산농도 측정에 의한 표준운동능력검사의 적용
문규환,김준규,김병선,엄영호,양일석,Mun, Kyu-whan,Kim, Joon-gyu,Kim, Byung-sun,Um, Young-ho,Yang, Il-suk 대한수의학회 1999 大韓獸醫學會誌 Vol.39 No.6
To establish the protocol of a standardized exercise test for evaluating exercise intolerance and degree of fitness in Thoroughbred racehorses, we examined serum lactate concentrations related to exercise intensities using the high speed treadmill. Twelve clinically healthy Thoroughbred racehorses with or without previous training or racing history were assigned to two gorups, fit and unfit group, respectively. The protocol used for the standardized exercise test was consisted of two stages : stage of warm-up and that of acceleration. During the warm-up, the horses exercised 5 min at 1.8m/s and 3 min 3.4m/s without inclination. At the acceleration stage, exercise test was performed at 10% slope and the speed was increased from the initial 5m/s to the maximal speed which each tested horse could keep up with. The speed was increased with incremental steps of 1 m/s every minute. During the last 15 sec of each step, blood samples were collected for serum lactate determination. $V_{max}$(maximal treadmill speed which tested horses could keep up with) of the fit group ($10.93{\pm}0.33m/s$, mean${\pm}$SE, n = 6) was higher than that of the unfit group ($9.52{\pm}0.23m/s$, mean${\pm}$SE, n = 6). Serum lactate concentrations increased exponentially according to exercise intensities. $V_{La4}$(speed producing a serum lactate concentration of 4mmol/l) of the fit group, $6.45{\pm}0.26m/s$, was higher than that of the unfit group, $5.45{\pm}0.23m/s$. $La_{peak}$(peak plasma lactate concentration during the exercise test) was lower in the fit group ($20.34{\pm}1.62mmol/l$ at 1 min after maximal intensity exercise) than in the unfit group ($24.78{\pm}1.09mmol/l$ at 2 min after maximal exercise step). $t_{50%}$(time required for the recovery of lactate concentration to be one-half of $La_{peak}$ after maximal exercise) of the unfit group and the fit group were 40.0 and 18.0 min, respectively. Therefore, the protocol of the incremental standardized exercise test utilized in this study seems to be reliable for the assessment of fitness and exercise intolerance for the Thoroughbred racehorses.