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Method Development for Determination of Octacosanol Contents in Triticale (x Triticosecale) Leaves
Hyojeong Yoon,Sang-Yun Lee,Kanphassorn Wimonmuang,Myoung Ryoul Park,Ja-Hwan Ku,Young-Sang Lee 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
Octacosanol is an aliphatic 28-carbon fatty alcohol with diverse biological effects. Aiming at development of an optimized extraction methods for quantitation of octacosanol, dried and powdered leaves of triticale (x Triticosecale) were extracted under different solvent, temperature, duration, and multiple extraction conditions and then derivatized prior to injection into a GC-MS followed by quantitation in selected ion monitoring (SIM, m/z=467.4) mode. Finalized optimal analysis methods were as follows: single-time extraction of 200 mg powdered leaf samples in 20 mL chloroform for 24 hours at room temperature followed by silylation with N-Methyl-N-trifluoroacetamide (MSTFA). Validation of developed methods showed acceptable accuracy (83–97%, recovery rate), linearity (R²=0.999, within 1 to 200 ppm), intra-date repeatability (4.3%, RSD, n=6), and inter-date reproducibility (3.6%, RSD, n=3). The limit of detection (LOD) and limit of quantitation (LOQ) were 0.15 ppm and 0.45 ppm, respectively. All these findings supported practicality of developed analysis methods to quantify octacosanol in leaves of triticale.
Neonatal outcomes of previable preterm births according to the delivery indications
( Hyojeong Kim ),( Yu Mi Shin ),( Eun Ji Oh ),( Kyong-no Lee ),( Hyeon Ji Kim ),( Jee Yoon Park ),( Kyung Joon Oh ) 대한산부인과학회 2022 대한산부인과학회 학술대회 Vol.108 No.-
Objective: To compare the neonatal outcomes of previable preterm births according to the delivery indication and to determine the obstetric risk factors affecting adverse outcomes. Methods: A retrospective study was performed in pregnancies delivered between 22+0 to 26+6 weeks in Seoul National University Bundang Hospital from April 2013 to September 2021. Stillbirths and elective termination of pregnancy were excluded. Patients were classified into two groups according to the delivery indication: 1) spontaneous preterm birth (sPTB) due to premature rupture of membranes (PPROM), preterm labor, or acute cervical insufficiency and 2) indicated preterm birth (iPTB). Obstetric and neonatal outcomes were reviewed and compared between two groups. Results: Among 162 live births, the rate of sPTB was 72% (116/162). In neonatal outcomes, bronchopulmonary dysplasia (BPD) was significantly higher in the sPTB group than the iPTB group (53% vs. 26%, p=0.003). The proportions of transfusion, retinopathy of prematurity (ROP), and home oxygen demand at discharge were all significantly higher in the sPTB group than the iPTB group, however survival at discharge was significantly lower in the iPTB group (all p-value < 0.05). In the multivariate analysis after adjustment of confounding factors, the sPTB group was significantly associated with higher rate of BPD (odds ratio 2.95, 95% confidence interval 1.13-7.71, p-value=0.028). and at the same time, higher rate of survival at discharge (odds ratio 2.98, 95% confidence interval 1.07-8.34, p-value=0.037). One year follow-up showed the rates of cerebral palsy and developmental delay were all higher in the iPTB group than the sPTB group, however the difference did not reach statistical significance (32% vs. 14% and 24% vs. 10%, respectively, both p-value >0.05). Conclusion: In previable preterm births, sPTB was associated with higher incidence of BPD, however had better neonatal survival rate overall.
대규모 다중 처리기 시스템을 위한 연결망 검증 시스템의 설계 : 다양한 검색 환경 제공
송효정(Hyojeong Song),권보섭(Bo Seob Kwon),김지윤(Ji Yun Kim),유동호(Dong Ho Yoo),윤현수(Hyunsoo Yoon) 한국정보과학회 1995 한국정보과학회 학술발표논문집 Vol.22 No.1
최근들어 국내, 국외에서 대규모 다중 처리기 시스템의 개발이 활발히 이루어지고 있다. 이들의 개발 과정에서, 다중 처리기 시스템의 핵심 부분인 상호 연결망에 대한 동작상의 오류와 성능 검증은 반드시 필요하다[1],[2],[3],[4]. 특히 대규모 시스템의 경우 상호 연결망에 구동되는 신호선의 수가 방대하기 때문에, 이들을 사용자가 원하는 형태로 검색, 저장, 가공하여 제공하는 것이 요구된다. 본 논문에서는 사용자에게 의미있는 검색 조건을 제공하는 연결망 검증 시스템을 설계한 후, 기존 방법과 비교해서 적은 하드웨어 비용을 갖음을 보인다.
송효정(Hyojeong Song),권보섭(Boseob Kwon),윤현수(Hyunsoo Yoon) 한국정보과학회 1999 정보과학회논문지 : 시스템 및 이론 Vol.26 No.5
기본 배년 네트워크의 내부 링크를 확장계수(dilation degree)배만큼 확장한 확장 배년 네트워크(dilater banyan network)는 기존 병렬처리 컴퓨터나 ATM 스위칭 시스템을 위한 효율적인 통신 하부 구조로서 여겨져 왔다. 본 논문에서는, 특히 각 스위치 소자 내부에 버퍼가 있는 확장 배년 네트워크의 성능 분석 모델을 마코프 체인에 기초하여 제안한다. 제안한 분석모델에 의해 도출된 네트워크 지연시간과 정규처리율의 값을 모의실험 결과와 비교하고, 네트워크 부하가 높고 확장 계수가 작은 경우를 제외하고는 두 결과값이 항상 일치함을 보인다. 이러한 확장 배년 네트워크는 스위치의 크기와 관계없이 확장 계수가 3이상이면 이상적인 처리율과 지연시간을 나타낸다. Dilated banyan networks have been regarded as a promising subsystem of parallel computers and ATM switching systems. In this paper, we propose a performance model, based on a Markov chain, for dilated banyan networks with internal buffers. With the proposed performance model, we can produce their network delay and normalized throughput, which, at almose all cases, accord with values from simulation experiments. The both values approximate to ideal ones irrespective of network size, if dilation degree is 3 or more.
Seok, Hyojeong,Yoon, Donghwan,Lim, Cheol Soon,Park, Byungwoon,Seo, Seung-Woo,Park, Jun-Pyo The Institute of Positioning 2015 Journal of Positioning, Navigation, and Timing Vol.4 No.2
In the case of satellite navigation positioning, the shielding of satellite signals is determined by the environment of the region at which a user is located, and the navigation performance is determined accordingly. The accuracy of user position determination varies depending on the dilution of precision (DOP) which is a measuring index for the geometric characteristics of visible satellites; and if the minimum visible satellites are not secured, position determination is impossible. Currently, the GLObal NAvigation Satellite system (GLONASS) of Russia is used to supplement the navigation performance of the Global Positioning System (GPS) in regions where GPS cannot be used. In addition, the European Satellite Navigation System (Galileo) of the European Union, the Chinese Satellite Navigation System (BeiDou) of China, the Quasi-Zenith Satellite System (QZSS) of Japan, and the Indian Regional Navigation Satellite System (IRNSS) of India are aimed to achieve the full operational capability (FOC) operation of the navigation system. Thus, the number of satellites available for navigation would rapidly increase, particularly in the Asian region; and when integrated navigation is performed, the improvement of navigation performance is expected to be much larger than that in other regions. To secure a stable and prompt position solution, GPS-GLONASS integrated navigation is generally performed at present. However, as available satellite navigation systems have been diversified, finding the minimum satellite constellation combination to obtain the best navigation performance has recently become an issue. For this purpose, it is necessary to examine and predict the navigation performance that could be obtained by the addition of the third satellite navigation system in addition to GPS-GLONASS. In this study, the current status of the integrated navigation performance for various satellite constellation combinations was analyzed based on 2014, and the navigation performance in 2020 was predicted based on the FOC plan of the satellite navigation system for each country. For this prediction, the orbital elements and nominal almanac data of satellite navigation systems that can be observed in the Korean Peninsula were organized, and the minimum elevation angle expecting signal shielding was established based on Matlab and the performance was predicted in terms of DOP. In the case of integrated navigation, a time offset determination algorithm needs to be considered in order to estimate the clock error between navigation systems, and it was analyzed using two kinds of methods: a satellite navigation message based estimation method and a receiver based method where a user directly performs estimation. This simulation is expected to be used as an index for the establishment of the minimum satellite constellation for obtaining the best navigation performance.