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지영석(Jee, Young-Seok),나세윤(Lah, Se-Yun),조구영(Cho, Goo-Young),차석원(Cha, Suk-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
Recently by the development of the electronic engineering technology various mobile devices are developed. But their operation time need to be extended although capacity of the batteries are limited. We focused our attention to the portable SOFC system. Because SOFC has the high efficiency and a lot of strongness in comparison with other kinds of fuel cells, We evaluated hydrogen fed SOFC 50W system theoretically and got the results about the operating condition range from the comparison of the power efficiency, exhaust gas temperature, required heat for maintaining the operation temperature and operation time.
지영석(Jee, Young-Seok),고정식(Ko, Jeong-Sik),차석원(Cha, Suk-Won) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
Recently by the development of the electronic engineering technology various mobile devices are developed. But their operation time need to be extended although capacity of the batteries are limited. We focused our attention to the portable SOFC system. Because SOFC has the high efficiency and a lot of strongness in comparison with other kinds of fuel cells. In addition they can be built as a self/non-reformable system and single/dual chamber system. So We evaluated some types of SOFC theoretically, and compared the results from the fuel and performance efficiency point of view.
양지명,지영석,윤경철,Jee Myung Yang,Yong Sok Ji,Kyung Chul Yoon 대한안과학회 2014 대한안과학회지 Vol.55 No.6
Purpose: To report a case of chronic osteomyelitis of the orbit. Case summary: A 61-year-old woman visited the ophthalmology clinic with a 3-month history of right periorbital swelling and pain. She had a history of ondontitis treated with oral antibiotics three months previously. A hard, tender, swollen mass was palpated near the right lower eyelid extending to the floor of the right orbit. Otherwise, there were no other clinically-specific ocular signs. Orbital computed tomography and bone scan findings suggested right periorbital soft tissue inflammation with underlying osteomyelitis of maxillar and zygomatic bones involving the inferior and lateral orbital walls. The patient was admitted and treated with broad spectrum systemic antibiotics. After 7 days, periorbital soft tissue swelling and pain were improved, but the size of the hard mass was unchanged. Seven days after admission, incision and drainage of the periorbital hard mass near the lower eyelid and debridement of the necrotic and pyogenic tissue were performed. Histologic examination showed chronic granulomatous inflammation and bony necrosis of the mass. The patient was discharged after receiving systemic antibiotics for 7 more days. At the 6-month follow-up, no recurrence or abnormal findings in the right periorbital region were observed. Conclusions: Chronic orbital osteomyelitis should be treated with combined systemic antibiotics and surgical intervention. J Korean Ophthalmol Soc 2014;55(6):902-907
SOFC용 전극 제작 조건에 따른 전극 성능 및 구조 분석
나세윤(Lah, Se-Yun),지영석(Jee, Young-Seok),이윤호(Lee, Yoon-Ho),조구영(Cho, Goo-Young),차석원(Cha, Suk-Won) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
In order to develop SOFC cell performance, many kind of things were investigated. Electrode microstructure is the one of them therefore we focus on electrodes fabrication easily and efficiently. We can fabricate electrodes easily with Pt using DC magnetron sputtering and sintering. However sputtering is difficult to handle and to grow porous electrodes what we require. On the other hand sintering is much easier than sputtering to make porous and adhesive electrodes. So in this paper we deal with sintering and optimize to deposit electrodes conditions by analyzing electrode microstructure with sacnning electron microscopy(SEM) micrograph. Also, we compare electrochemical performance of cells fabricated by sputtering and sintering.
한국인의 GSTM1, GSTT1 유전자와 당뇨망막병증의 연관성에 대한 분석
김영휘(Yung Hui Kim),양지명(Jee Myung Yang),장재용(Jae Yong Jang),지영석(Yong Sok Ji) 대한안과학회 2017 대한안과학회지 Vol.58 No.3
목적: 제2형 당뇨병 환자의 Glutathione-S-transferase (GST) 유전자의 변이와 당뇨망막병증 발생의 연관성에 대해 분석하고자 하였다. 대상과 방법: 2013년 1월부터 2015년 11월까지 당뇨망막병증으로 진단받은 환자 131명과 유병기간이 10년 이상인 제2형 당뇨병 환자 중 당뇨망막병증이 발생하지 않은 105명, 그리고 당뇨병이 없는 정상대조군 45명을 대상으로 환자 대조군 연구를 시행하였다. 대상자들의 GSTM1 및 GSTT1 유전자 분석을 위해 사전 동의하에 말초혈액에서 얻어진 혈액샘플로부터 중합효소연쇄반응을 통해 각 유전자의 결손 유무를 분석하였다. 결과: 단변량분석에서 당뇨망막병증이 발생한 군이 발생하지 않은 군보다 제2형 당뇨병의 유병기간이 길었고(p=0.004), HbA1c 값이 더 높았다(p=0.004). GSTT1 유전자결손은 두 군 간의 차이는 없었으나, GSTM1 유전자결손은 당뇨망막병증이 있는 군에서 더 낮은 비율을 보였다(p=0.017). 로지스틱 회귀분석에서 당뇨의 유병기간(p=0.013), 높은 HbA1c (p=0.007), GSTM1 유전자결손이 없는 경우 (p=0.012)가 당뇨망막병증 발생의 위험인자로 분석되었다. 결론: 한국인을 대상으로 시행한 본 연구에서 GSTT1 유전자결손은 당뇨망막병증 발생의 위험성을 증가시키지 않는 반면, GSTM1 유전자결손은 당뇨망막병증 발생의 억제와 연관이 있었다. 향후 이에 대한 대다수의 환자 대조군 연구가 더 필요할 것으로 생각된다. Purpose: To investigate the correlation between Glutathione-S-transferase (GST) genes and diabetic retinopathy (DR) in patients with type 2 diabetes mellitus (DM). Methods: In this case-control study, 131 patients who were diagnosed with DR, 105 diabetic patients who did not have DR, and 45 nondiabetic controls were examined from January 2013 to November 2015. To analyze deletion of the GSTT1 and GSTM1 genes, polymerase chain reactions of DNA in a buffy coat from peripheral blood were performed via electrophoresis. Results: There were no statistically significant differences in age, sex, or spherical equivalent between the 236 type 2 diabetic patients and the 45 normal controls (p > 0.05). In both univariate and multivariate analyses, the duration of type 2 DR was longer (p = 0.004, p = 0.013), and HbA1c was higher (p = 0.004, p = 0.007) in the DR group than in the non-DR group. Presence of a GSTM1 deletion is associated with a lower frequency of DR (p = 0.017, p = 0.012). Conclusions: Deletion of the GSTT1 gene is not associated with an increased risk of DR, whereas GSTM1 deletion is associated with a lower risk of DR in patients with type 2 DM in the Korean population. Additional studies with larger sample sizes and different types of GST genes are needed to confirm this study.
이경민,엄대자,윤경봉,지영석 대한마취과학회 1991 Korean Journal of Anesthesiology Vol.24 No.4
We have experienced an anesthetic management of a 39-year-old male patient with pheo-chromocytoma on left adrenal gland. The patient had been treated with prazosin for 2 weeks preoperatively and premedicated with lorazepam, diazepam and glycopyrrolate. Following induction of anesthesia with intravenous diazepam, fentanyl, thiopental sodium and vecuronium, endotracheal intubation was performed. After intubation, anethesia was maintained with O₂-N₂O-isoflurane and vecuronium. Blood pressure until tumor removal had been controlled with sodium nitroprusside and phentolamine. After tumor resection, blood pressure was controlled by Hartmanns solution, whole blood and dopamine administration. A tolerable blood pressure and pulse rate were maintained throughout the procedure.
홍정연,이명희,이세실,지영석,강진구,임웅철,강희륜 대한마취과학회 1999 Korean Journal of Anesthesiology Vol.37 No.6
Background : The pharmacologic interactions between propofol and adjuvant agents have increasingly been recognized as clinically important and the improved knowledge of these is being used to optimise the quality of total intravenous anesthesia. The aim of the present study was to investigate the effects of fentanyl, fentanyl-midazolam, and fentanyl-ketorolac as analgesic supplementations on the induction of propofol anesthesia with Diprifusor TCI. Methods : Sixty ASA 1 patients undergoing elective diagnostic laparoscopy were randomly allocated to three groups equally according to injected adjuvant agents : group F, fentanyl 1 μg/kg; group FM, fentanyl 1μg/kg-midazolam 0.05 mg/kg; group FK, fentanyl 1μg/kg-ketorolac 0.5 mg/kg IV before induction. Propofol target concentration of 4 μg/ml was preset and unconsciousness with 3 min was considered as successful. Induction dose, time, success rate of induction, calculated and effective concentration, context sensitive decrement time when awakening concentratios 1.2μg/ml, vital signs and side effects were checked. Results : Successful induction rate was 55% in the group F, 100% in the group FM, and 85% in the group FK (P< 0.05). Induction time and dose were significantly decreased in the group FM compared with the group F and FK. Calculated concentration, effective concentration, and context sensitive decrement time were significantly lower in the group FM than other groups. Injection pain score and postoperative pain score showed no differences between groups, but incidence of apnea was significantly increased in the group FM. Conclusions : Fentanyl-midazolam as a analgesic supplementation offered better quality of propofol induction using TCI, but showed increased incidence of apnea compared with fentanyl or fentanyl- ketorolac. (Korean J Anesthesiol 1999; 37: 966∼972)