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Selective Epoxidation of Alkene with Molecular Oxygen on Metal Organic Framework Catalyst
김경안,황성연,제갈종건,차현길 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
Epoxidation of alkene with heterogeneous catalyst of metal-organic framework (MOF) was studied. Unlike homogeneous catalysts, hetero-geneous catalyst were can be easily separated and reused several times. Hence, the heterogeneous MOF catalyst was separated from the reaction solution by filtration after epoxidation reaction of alkene at mild condition by molecular oxygen, the MOF as heterogeneous catalyst have high activity and, multiple recycles in epoxidation of alkene.
Chemical Recycling of PET through Hydrolysis by Biomass-derived Acid catalyst
김경안,강명종,황성연,제갈종건,차현길 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Chemical recycling of polyethylene terephthalate (PET) has been tried for decades, but still there are not efficient ways to recycling PET. Here, we introduce the microwave assisted PET hydrolysis for recycling PET into terephthalic acid (TPA) and ethylene glycol (EG) with biomassderived acid catalyst. Chemically modified biomass-derived silica has been introduced firstly in this work for microwave-assisted PET hydrolysis reaction.
김경안 한국외국어대학교 외국어교육연구소 1997 외국어교육연구 Vol.- No.11
Causative construction has been worked upon from the syntactic point of view in many languages. In English, verbs such as 'make', 'let', and 'have' are considered syntactic causative verbs. The equivalent of 'do' and 'make' in other languages have often been used as the syntactic causative verbs. Semantically, however, there is no reason why verbs such as 'order', 'request' cannot be causative verbs. Semantically causation includes a 'cause', and 'effect'. The causing event, 'cause' is frequently contained in the main clause and the desired event, 'effect ' in the embedded clause. When the main verb is, for instance, 'make' in an English causative sentence, it is not clear what the causing event may be although there must be a certain event which occurred to make the desired event happen. When the verb is 'order', it is a little clearer to understand what the causing event may be. The causer gives an order, verbally or in writing, which is intended to make the desired event happen. In this paper, we argue that in case of Korean, there is a match between syntax and semantics in the causative construction as the same complementizer 'key' or' tolok' is used. This is very different from the case of English because in English three different syntactic structures are used - bare infinitive, to-infinitive, and 'in order that' clause. Japanese uses two different syntactic structures, one of them including a morphological process using a causative morpheme 'sase', and the other using a complementizer 'yooni'. Thai behaves rather Elte Korean in the sense that one element 'hay (give)' can be used to cover the entirety of the semantic causative phenomenon. One difference between Thai and Korean is, though, that in Thai there can be two other ways besides using 'hay' to express the syntactic causative construction, which are to use the verb 'tham (do)' or 'tham hay' together. Based on what we have seen so far, we can have the following continuum of match-mismatch relation between syntax and semantics for the causative phenomenon.
New Therapeutic Approaches to the Treatment of Dyslipidemia 2: LDL-C and Lp(a)
김경안,박훈준 한국지질동맥경화학회 2023 지질·동맥경화학회지 Vol.12 No.1
Dyslipidemia is an important risk factor for atherosclerotic cardiovascular disease (ASCVD). There are abundant and unequivocal data to indicate that low-density lipoproteins (LDL) are a cause of ASCVD. Reduction of plasma low-density lipoprotein cholesterol (LDL-C) by medical therapy such as statins, ezetimibe and proprotein convertase subtilisin/kexin type 9 (PCSK9) inhibitors have proven to significantly reduce the risk of cardiovascular events. However, for many reasons, many patients are not able to achieve LDL-C levels recommended by guidelines on currently available therapies. This has led to the development of new drugs lowering LDL-C, such as inclisiran, bempedoic acid, and evinacumab, in the hope of reducing cardiovascular (CV) risk. Drugs targeting lipoprotein (a) (Lp[a]) also have a role in the prevention of atherosclerosis, with genetic studies having established that 20%–30% of the human population inherits plasma Lp(a) levels in the atherogenic range. In this paper, we will review the recent progress made in the approaches to LDL-C and Lp(a) therapeutic modulation.