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최성호(Sungho Choi),서인준(In-Joon Seo) 한국기상학회 2020 대기 Vol.30 No.4
Among the weather conditions on the Korean Peninsula, Changma is a notable phenomenon. This is because substantial amount of the precipitation on the Korean Peninsula tends to happen during the Changma season. But there are times when this tendency falls into whims. That’s the case when it doesn’t rain or rains only little during the Changma season. The Korea Meteorological Administration (KMA) describes this phenomenon as ‘Dry Changma’ – meaning 〈Changma without rain〉. However, ‘Dry Changma’ is often regarded as an instance of contradicto in adjecto. Since the general public believe that ‘Changma’ means 〈a phenomenon of continuous rain for a long time or that rain〉. This confusion often leads to distrust in meteorologists. In this paper, we would like to propose a reasonable solution to this conundrum by employing the conceptual resources of contemporary philosophy. First of all, I will make explicit the meaning of ‘Changma’ that the public and meteorologists think of. And then a brief explanation of the concept of natural kinds will be presented and the argument will be made that Changma is a natural kind. Next, we will discuss a view on natural kind terms advanced by Saul Kripke, a renowned philosopher. We will argue that in Kripke’s view, the general public’s thought that ‘Dry Changma’ is contradicto in adjecto is not correct. This will eventually lead to the conclusion that the meteorologist usage of ‘Changma’ is the correct one, which is thereby to be adopted by the public.
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중잔유의 500MW 급 가스화 복합발전 적용 성능 평가
이승종,윤용승,유진열,서인준 한국화학공학회 1999 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.37 No.5
원유 정제 잔류물인 중잔유(heavy residual oil)를 발전연료로서 500 ㎿급 IGCC 플랜트에 적용하였을 때의 성능을 평가하기 위한 방안으로 정적씨스템 모사 방법을 사용하였다. 모사에 적용한 중잔유는 visbreaker residue와 butane asphalt 및 국내 정유공장으로부터 입수한 asphalt였으며, 씨스템 모사 방법의 검증을 위해서 중잔유의 가스화반응 모사결과를 Shell사에서 발표한 같은 중잔유에 대한 실증자료와 비교함으로써 사용된 모사 방법이 적절함을 우선 입증하였다. 이후 기타 중잔유를 사용하는 IGCC 플랜트에 대하여 같은 모사 방법을 적용하였다. 모사 결과, 중잔유의 가스화 반응은 1,300℃에서 진행하였을 때 가스화 반응에 의해 생성된 생성가스(raw gas)의 발열량은 2,750-2,800㎉/㎥ 범위였고, 발전 효율은 43%이상으로 발전 연료로서 적합한 성능을 나타내었다. As a way to evaluate the performance of the IGCC process with fuels from petroleum refineries, heating values of the raw gas as well as the plant efficiency were simulated by employing the static process simulation technique. Fuels chosen were visbreaker residue, butane asphalt and a asphalt from one Korean refinery. In order to verify the simulation technique, simulated results of a visbreaker residue were compared first with the actual demonstration plant data published from Shell Co. and then the simulation technique was applied to the cases of other fuels, butane asphalt and a Korean refinery asphalt. At the gasifier temperature of 1,300℃, simulation results showed that the heating value of raw gas produced from residual oils was in the range of 2,750-2,800 ㎉/㎥ with the plant efficiency over 43%. The results exhibit the technical and economical viability of using heavy residual oils from petroleum refineries as successful fuels in IGCC power plants.
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