About lexicons, i think there is no special vocab used only in science papers. About the style, i think it is same in almost any language, we don't use metaphor, idioms and implicit expressions. Unlike English, even the law does not have much special vocab. In the past it did but the government is putting effort to change them into everyday used words. Even elementary school student have no big difficulty in reading legal provisions.

Just like in any other languages, scientific articles will use a lot of technical terms specific to the field, which are typically hanja-based special terms mostly known in those specialized fields. Here's a page listing technical papers published by a major technical research institution: https://ettrends.etri.re.kr/ettrends/14/#section0. You can get a taste of the technical jargon in use from the titles and abstracts.