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Choi Hayeon,Kim Hokyung,Kim Ki Tae 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.6
Fluorescent nucleosides play essential roles in designing functional nucleic acid systems for various biological applications. Therefore, expanding the scope of fluorescent nucleosides with unique properties has become an important challenge. Herein, we report novel fluorescent nucleosides constructed by aldol-type condensation between 5-formylpyrimidine and a fluorogenic dye. Two new fluorescent nucleobase analogs (4a and 4c), derived from 2-dicyanomethylene- 3-cyano-4,5,5-trimethyl-2,5-dihydrofuran and a quinolinium moiety, respectively, were determined through reaction screening, and their photophysical properties and formation kinetics were investigated. Among the two, 4a exhibits a unique fluorescence featuring a large Stokes shift (67–117 nm) and high environmental sensitivity, as evidenced by its viscosity-induced fluorescence and aggregationinduced emission behavior. The kinetic study revealed that 4a was readily synthesized even in aqueous solutions with pH 7 (kobs = 6.4 105/s). The overall results indicate that 4a is a promising molecule for use in fluorescent nucleic acid systems, particularly for selective fluorogenic labeling of 5-formyluracil.
Hayeon Choi,Youngkyoung Koo,Seona Lee,Sangsoo Park 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.9
Location Based Services (LBS) are software algorithm systems used by internet protocol capable wireless device technologies assist and/or replace Global Positioning System (GPS) with their task of acquiring and interpreting location describing data. LBS, and the data they provide, are increasingly being used by a growing number of users. As the demand for LBS grows, increasingly there is an additional requirement for more accurate indoor location position determination. Indoor localization algorithm has always been a challenge for location describing device manufacturers. This paper proposes a solution for improving accuracy while also decreasing computational requirements. Leveraging readily obtainable, cost-effective, Bluetooth Low Energy (BLE) Beacons, the research details a modified trilateration algorithm utilizing weighted nodes coupled with emitter/receiver distance measuring improvements accomplished using transmitter emission fingerprinting techniques. The proposed algorithm is evaluated through thorough experimentations that produce a reduction in difference between the real and measured location. The results found are solely obtained through algorithmic solutions utilizing standardized transmission protocols and readily available devices technologies.
Hayeon Choi,Sangsoo Park 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.2
In contrast to the previous ARM microprocessor, the ARM Cortex-M3 processor provides a method for accelerating context switching, which is supported by dedicated hardware logic vis a software interrupt (or trap). In general, it is expected that retaining the context of a task using hardware will reduce the context switching time, but it is also known that software interrupts or traps incur their own overheads. In this study, we propose an algorithm for analyzing the performance of context switching methods in uC/OS-II the Cortex-M3. According to our experimental analysis, we obtained the same results using the algorithm in an ideal state and in a real application. We expect that the algorithms and experimental results described in this study may help embedded system designers by providing quantitative measures in the context switching time of Cortex-M3 using a real-world application.
ARM Cortex-M3 의 HW/SW 기반 문맥교환 시간의 정량적인 평가
최하연 ( Hayeon Choi ),박상수 ( Sangsoo Park ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
임베디드 마이크로프로세서인 ARM Cortex-M3 는 기존의 것들과는 달리 짧은 문맥교환을 제공하기 위해 Trap 을 이용하여 문맥교환 과정을 일부 하드웨어적으로 처리하는 기능을 제공한다. 일반적으로 Trap (혹은 소프트웨어 인터럽트)은 그 자신만의 오버헤드를 갖고 있는 것으로 알려져 있다. 따라서 본 논문에서는 소프트웨어적으로 문맥교환을 하던 방식에 비해 어느 정도의 성능 향상이 있을지에 대한 정량적인 비교 평가를 수행하여 Cortex-M3 를 기반으로 한 임베디드 시스템의 설계에 도움을 주도록 한다.