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Wi, Yeon-Hwa,Lee, Kang-Seok,Lee, Byung-Hyung,Choe, Soon-Ja The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.10
Stable, spherical, polystyrene particles were synthesized in ab initio dispersion polymerization by using the poly(methacrylic acid)[PMAA] macro-RAFT agent. The presence of the PMAA macro-RAFT agent on the polystyrene (PS) particles was confirmed by NMR and FTIR spectroscopy. The PS particle size was influenced by the concentration of the RAFT agent and monomer due to the initial nucleation. When the concentration of the PMAA macro-RAFT agent was increased from 2 to 10 wt% relative to the monomer, the average particle size decreased from 2.31 to 1.36 ${\mu}m$, the conversion decreased from 93.3 to 88.9%, the weight-average molecular weight increased from 46,300 to 150,200 g $mol^{-1}$ and the PDI decreased from 2.79 to 1.94, respectively. In particular, the incorporation of 10 wt% of PMAA macro-RAFT agent produced monodisperse PS spheres of 1.36 ${\mu}m$ with a coefficient of variation (CV) of 6.44%. Thus, the PMAA macro-RAFT agent worked as a reactive steric stabilizer providing monodisperse, micron-sized, PS particles.
Kim Si-Ho,Wi Yu Mi,Yun Su Yeon,Ryu Jeong Seon,Shin Jung Min,Lee Eun Hui,Seo Kyung Hwa,Lee Sung Hee,Peck Kyong Ran 대한의학회 2021 Journal of Korean medical science Vol.36 No.14
Coronavirus disease 2019 vaccinations for healthcare workers (HCWs) have begun in South Korea. To investigate adverse events (AEs) of the first dose of each vaccine, any symptom was collected daily for seven days after vaccination in a tertiary hospital. We found that 1,301 of 1,403 ChAdOx1 nCoV-19 recipients and 38 of 80 BNT162b2 recipients reported AEs respectively (90.9% vs. 52.5%): injection-site pain (77.7% vs. 51.2%), myalgia (60.5% vs. 11.2%), fatigue (50.7% vs. 7.5%), headache (47.4% vs. 7.5%), and fever (36.1% vs. 5%; P < 0.001 for all). Young HCWs reported more AEs with ChAdOx1 nCoV-19 than with BNT162b2. No incidences of anaphylaxis were observed. Only one serious AE required hospitalization for serious vomiting, and completely recovered. In conclusion, reported AEs were more common in recipients with ChAdOx1 nCoV-19 than in those with BNT162b2. However, most of the reported AEs were mild to moderate in severity. Sufficient explanation and preparation for expected AEs required to promote widespread vaccination.
의료기기의 광균일도 향상을 위한 LED 배열방식의 비교분석
손선국(Sun-Guk Son),황대위(Dae-Wi Hwang),송하연(Ha-Yeon Song),홍재화(Jae-Hwa Hong),김승일(seung-il kim),류장렬(Jang-Ryul Ryu) 한국정보기술학회 2011 Proceedings of KIIT Conference Vol.2011 No.5
본 논문은 LED 의료기기에서 LED(IR, RED)의 광균일도를 향상시키기 위한 효율적인 LED배열 구조에 관한 것으로, 특히, LED(150개 이상)가 요구되는 11″인치이상의 LED의료기기에 적용할 수 있는 다양한 LED 배열방식을 제안한다. 제안하는 배열 방식은 3종류의 등간격 평면형배열(Type1-1~2/Type2-1~2/Type3-1~2)과 3종류의 등간격 원통형배열(Type4-1~2/Type5-1~2/Type6-1~2)로, Type*-1~2는 LED와 Receiver와의 거리를 다르게 한 배열된 구조를 가지며, Type1-1~2/Type4-1~2는 Stripe형, Type2-1~2/Type5-1~2는 Mosaic형, Type3-1~2/Type6-1~2는 Delta형의 등간격의 구조를 갖는다. 제안된 3종류 배열구조에 대해 LightTools를 사용하여 광균일도를 실험하였다. 실험결과, 3종류의 Type 중 11″인치이상에서의 광균일도는 모든 Type에서 Receiver를 10㎜로 떨어뜨려 측정한 경우 좋았고, 특히 Mosaic형 방식에서 가장 양호한 결과를 나타내었으나 조도값은 Stripe형 방식에서 가장 높았다. This paper presents various LED array methods to improve the luminous intensity uniformity of LED(IR, RED) for LED medical equipment, and especially LED array methods applicable to the LED medical equipment over 11 inches requiring a great quantity of LEDs(over 150) are represented. The presented LED array methods consist of three types of equal-distance Planar array architectures (Type1-1~2/Type2-1~2/Type3-1~2) and three types of equal-distance Cylindrical array architectures (Type4-1~2/Type5-1~2/Type6-1~2). Basically, Type*-1~2 employs a structure that are arranged in different distance between LED and the Receiver. Type1-1~2/Type4-1~2 are Stripe type, Type2-1~2/Type5-1~2 are Mosaic type, Type3-1~2/Type6-1~2 have the structure of the Delta type of equal-distance array. LED array methods presented in this paper was all simulated using the LightTools. As a simulation result, all three types showed a good luminous intensity uniformity when measured at 10㎜ away and especially the Mosaic type showed a good luminous intensity uniformity whereas roughness values were the highest in the Stripe-type approach.
정기화,김현섭,이현숙,최위형,김준기,이연숙,김남근,이경령,이정추,Jeong, Gi-Hwa,Kim, Hyeon-Seop,Lee, Hyeon-Suk,Choe, Wi-Hyeong,Kim, Jun-Gi,Lee, Yeon-Suk,Kim, Nam-Geun,Lee, Gyeong-Ryeong,Lee, Jeong-Chu The Korean Society for Integrative Biology 1997 Korean journal of biological sciences Vol.1 No.2
The distributions of G to A substitution ($G^{-75}{\rightarrow}A$) mutation in the human apolipoprotein A1 (APOAI) gene promoter region and glutathione S-tran-sferase Mu1 (GSTM1) gene deletion were examined in subjects with Korean population. The $G^{-75}{\rightarrow}A$ mutation of APOA1 was genotyped by the polymerase chain reaction (PCR) and subsequent digestion of the PCR product using either Mspl or Mval (n=206). The observed numbers of GG, GA and AA genotypes were 132, 63 and 11, respectively. The allele frequencies of G and A were 0.794 and 0.206, respectively. The GSTM1 gene deletion was simply examined by the PCR amplification (n=106). The observed numbers of null type ($GSTM1^*0/GSTM1^*0$) and positive type were 55 and 51, respectively. The allele frequency of $GSTM1^*0$ was 0.720.