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Characterization of zeolites on acylation reaction
한진규,임현주,고문규 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Acylated aromatics are traditionally prepared by the acylation of aromatics with acid chlorides using Lewis acids such as AlCl3, and BF3. These Lewis acids are demanding wasteful and often involves use of hazardous substances throughout production and a treatment of waste streams and emissions. Aplications of zeolites start from its specific pore size which matches a size of many monosubstituted aromatics. Tansient intemediate shape selectivity inhibits polyacylation and deacivation of catalyst. Reaction of anisole with acetic anhydride is carried out over different ratios of Al/Si of ZSM-5 and ZSM-11 and compared. Synthesized zeolites were characterized with XRD, BET, EDX, FT-IR, Pyridine-TPD, UV-Vis.
한진규 대한수면연구학회 2004 Journal of sleep medicine Vol.1 No.2
Excessive daytime sleepiness(EDS) has recognized consequences such as road traffic accidents, impaired psychological functioning and reduced work performance. EDS can result from multiple causes such as sleep deprivation, sleep fragmentation, neurological, psychiatric and circadian rhythm disorders. Treating the underlying causes of EDS remains the mainstay of therapy but in those who continue to be excessively sleepy, further treatment may be warranted. Traditionally, the amphetamine derivatives, methylphenidate and pemoline(collectively sympathomimetic) psychostimulants were the commonest form of therapy for EDS, particularly in conditions such as narcolepsy. More recently, the advent of modafinil has broadened the range of therapeutic options. Modafinil has a safer side effect profile and as a result, interest in this drug for the management of EDS in other disorders, as well as narcolepsy, has increased considerably. There is a growing school of thought that modafinil may have a role to play in other indications such as obstructive sleep apnea/hypopnea syndrome already treated by nasal continuous positive airway pressure but persisting EDS, shift work sleep disorders, neurological causes of sleepiness, and healthy adults performing sustained operations, particularly those in the military. However, until adequately powered randomized-controlled trials confirm long-term efficacy and safety, the recommendation of wakefulness promoters in healthy adults cannot be justified.
기지국간 동기오차를 고려한 TD-CDMA 시스템 성능 분석
한진규,권동승,이명원,박한규 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.12
IMT-2000에서 TDD 모드를 지원하도록 제안되어 있는 TD-CDMA 시스템은 CDMA 뿐 아니라 TDMA, TDD 등을 융합한 기술을 이용하고 있다. TD-CDMA 시스템 성능 분석을 위해서는 CDMA 기술에서 고려해야 하는 간섭 뿐 아니라 T7MA와 TDD 기술에서 발생할 수 있는 간섭에 대한 모델링이 필수적이다. 특히 TDD 모드에서는 FDD 모드와는 달리 기지국간 간섭과 이동국간 간섭이 발생하는 특징을 갖는다. 본 논문에서는 TD-CDMA 시스템 성능 분석을 위한 간섭 모델링을 제시하고 프레임 내 슬롯 할당 방법에 따른 성능 분석을 수행하였다. 또한 기지국간의 동기오차를 고려할 수 있도록 간섭 모델링을 확장하였다. 시뮬레이션 결과를 통해 인접 기지국간에 동기오차가 적고 유사한 슬롯 구조를 가질수록 성능이 향상됨을 확인하였다. TD-CDMA is based on a combination of CDMA, TDMA, and TDD technologies, and it is proposed to support TDD mode for IMT-2000 service. To analyze the performance of TD-CDMA, we have to establish a modeling technique that takes into account the interference that can occur in each scheme. There is special interference in TDD mode, e.g. interference from base station to base station and from mobile to mobile. In this paper, we present an interference model for analyzing the performance of TD-CDMA systems and the slot allocation strategies. This model includes the cell synchronization error. As a result, this paper shows that almost equal slot allocation and low cell synchronization error guarantee desirable performance in TD-CDMA.