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Hee-Beom Yang*,Han-Byol Song*,Ji-Won Han,Joong Kee Youn,Dayoung Ko,Young Jin Ryu,Ji Young Kim,Hyun-Young Kim 대한외과학회 2023 Annals of Surgical Treatment and Research(ASRT) Vol.104 No.1
Purpose: Appendectomy is one of the most common surgeries in children. Although various radiological examinations are performed, they do not always reveal a definitive diagnosis of appendicitis. This study aimed to investigate the clinical course of equivocal appendicitis, identify the factors associated with appendectomy, and suggest appropriate management for these patients. Methods: Patients younger than 19 years who visited Seoul National University Bundang Hospital with a differential diagnosis of appendicitis from January 2013 to December 2017 were included. All participants conducted ‘appendiceal CT’ with a scoring scale of 1–5. The higher the score, the higher the likelihood of a radiologic diagnosis of appendicitis. We defined the appendicitis CT score of 2–4 as equivocal appendicitis (n = 143). Medical records were reviewed retrospectively for demographics, further examination as abdominal ultrasonography, and appendectomy status (yes or no). The mean follow-up period was 15.6 ± 71 days. Results: Equivocal appendicitis accounted for 16.7%. Additional ultrasonography test was performed in 24.5% (35 of 143). In total, 34 patients (23.8%) underwent appendectomy. Among the patients with appendiceal CT scores 2, 3, and 4, 4.9%, 50.0%, and 87.5% underwent appendectomy, respectively. Higher WBC count, higher appendicitis CT score, and readmission were significantly associated with appendectomy in patients with equivocal appendicitis. Conclusion: Higher appendicitis CT score and WBC level were positively associated with appendectomy. Careful observation can be a treatment option in appendicitis CT score 2 or 3 groups. Appendectomy is the first-line treatment for patients with appendicitis score 4. Additional ultrasonography test is advisable to determine treatment modality for equivocal appendicitis.
Jae-hee Han,Ji-Hun Yang,Won-Suk Yang,Cheol-Woong Yang,Ji-Beom Yoo,Chong-Yun Park 한국진공학회(ASCT) 2000 Journal of Korean Vacuum Science & Technology Vol.4 No.2
Vertically aligned carbon nanotubes on nickel coated glass substrates were obtained at low temperatures below 600℃ by plasma enhanced hot filament chemical vapor deposition where acetylene gas was used as the carbon source and ammonia gas was used as the dilution gas and catalyst. The diameters of the nanotubes decreased from 96 ㎚ to 41 ㎚ as NH₃/C₂H₂ ratio increased from 2:1 to 5:1. Total flow rate of input gases with constant NH₃/C₂H₂ ratio did not change the diameter of carbon nanotubes. No growth of the carbon nanotubes was observed with only C₂H₂ nor N₂ instead of NH₃. G line and D line in Raman spectra were observed, which implies that there were many structural defects in carbon nanotubes.
양희범(Hee-Beom Yang),이성철(Seong-Cheol Lee),김세림(Se-Lim Kim),이민석(Min-Suk Lee),이진호(Jin-Ho Lee),김태춘(Tae-Choon Kim),김영걸(Young-Gul Kim),송관정(Kwan-Jeong Song) 한국차학회 2008 한국차학회지 Vol.14 No.2
차에서 효율적인 교배육종 시스템을 확립코자 몇 가지 교배조합에서의 연차 간 결실율과 종자 형성율을 평가하였다. 10% 자당, 2% 한천, pH 5.6의 화분 발아 배지에서의 화분 발아 검정은 인공교배에 이용한 화분의 활력이 정상적이었음을 나타냈다. 인공교배 3일 후 이내에 화분관은 화주를 통해 자방의 상단을 침입하는 것으로 나타났다. 교배조합에 따른 결실율은 3.7~57.7%, 열매 당 종자 수는 1.4~3.0 개 내외를 나타냈다. 연차 간 변이에 있어서 열매 당 종자 수의 변이는 미미했고, 결실율의 변이는 다소 크게 나타났다. 자방은 3개의 심실로 구성되고 심실 당 4개의 배주가 위치하여 총 12개 배주가 형성됨을 확인하였다. Aiming to establish an efficient conventional breeding system in tea (Camellia sinensis), fruit set and seed formation with seasonal variation were evaluated at some cross combinations. The pollen germination test was conducted on a medium consisting of 10% sucrose, 2% agar, pH 5.6 and the result indicated that pollens used in artificial pollination had normal germination activity. Pollen tubes penetrated through style into ovary within 3 days after artificial pollination. Fruit set was ranged at 3.7~57.7% and average number of seeds per fruit was varied at 1.4~3.0. Amount of variation was little at average number of seeds per fruit, but much high at fruit set. Morphological analysis determined that one ovary had three carpels and 12 ovules, including 4 ovules a one carpel, respectively.
양희범 ( Hee Beom Yang ),신창섭 ( Chang Sub Shin ) 충남대학교 기초과학연구원 2023 충남과학연구지 Vol.40 No.1
In this study, we aim to gain a more detailed understanding of particle spin using the tools of quantum field theory. Firstly, we delve into the fine structure of the hydrogen atom, investigating the discrepancies between the energy levels predicted by the Schrödinger equation and experimental results. These variations are attributed to various interactions, including relativistic effects and spin-orbit coupling. Our emphasis lies particularly on the impact of spin-orbit coupling, exploring the influence of the interaction between the electron's spin, manifested as a magnetic dipole moment, and the potential of the atomic nucleus on energy level changes. Secondly, we focus on the classification of particles into fermions or bosons based on whether their spin is a integer or a half-integer. As each classification leads to different exchange behaviors of particles, we investigate their responses accordingly and derive the spin-statistic theorem.