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Yi, Chong Seong,Rha, Jong Gu,Lee, Jong Kun,Kim, Yong Wook,Shin, Jong Chul,Kim, Soo Pyung THE CATHOLIC UNIVERSITY OF KOREA 1997 Bulletin of The Catholic Research Institutes of Me Vol.25 No.-
Respiratory distress syndrome(RDS) is a major cause of death in premature neonates, and it is caused by the failure of morphological and biochemical lung maturation(synthesis and secretion of lung surfactant). It is known that cortisol, thyroxine, prolactin, epidermal growth factor(EGF), and estrogen accelerate the lung maturation. Cortisol and thyroxine are currently used in the antenatal treatment for the prevention of RDS in premature neonates. In order to evaluate the effect of EGF on the levels of cortsol, thyroxine, and prolactin, this study was undertaken. Phosphate buffered saline(PBS) with and without EGF was directly injected into the 25 days' gestational fetus in uterus. Blood was collected for the measurement of cortisol, thyroxine, and prolactin one day or two days after the injection. Body weights and lung weights were also measured. The results were as follows : 1. There was no significant difference in body weights and lung weights between PBS-treated group(control group) and EGF-treated group(experimental group), 24 hours and 48 hours after the injection. 2. 24 hours after the injection, the levels of cortisol were significantly increased in the BGF-treated group compared with those in the PBS-treated group. However 48 hours after the injection, there was no significant difference in the levels of cortisol between the two groups. The levels of thyroxine and prolactin in the EGF-treated group did not significantly differ from those in the PBS-treated group 24 hours and 48 hours after the injection. In conclusion, in vivo, the synthesis of cortisol may be affected by EGF treatment, which suggests that the action of EGF for lung maturation may be partially mediated by the increased endogenous levels of cortisol.
A Simple ZVZCS Sustain Driver for a Plasma Display Panel
Yi Kang-Hyun,Han Sang-Kyoo,Choi Seong-Wook,Kim Chong-Eun,Moon Gun-Woo The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.4
A high efficiency and low cost sustain driver for a plasma display panel (PDP) utilizing a current pumping method is proposed. The main concept of the proposed circuit is using the current source to charge and discharge the panel. As a result, all power switches can achieve zero voltage switching (ZVS) and every auxiliary switch can also achieve zero current switching (ZCS). Since the inductor current can compensate for the discharge current, the current stress of all the power switches can be reduced considerably. Furthermore, it has features such as a simpler structure, less mass, lower cost, and lower electromagnetic interference than in previous circuits.
새로 발생한 13 q32.2 → qter 결손과 동반된 13 번 환상염색체 환아 1 예
황성진(Seong Jin Hwang),이지현(Jee Hyun Lee),박인양(In Yang Park),문희봉(Hee Bong Moon),오준환(Joon Hwan Oh),이귀세라(Gui Se Ra Lee),이종승(Chong Seung Yi),신종철(Jong Chul Shin),김수평(Soo Pyung Kim) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.2
We report a case of ring chromosome 13 with a distal deletion of 13q32.2→qter observed in a fetus who was referred to our institution at term due to severe growth restriction and multiple congenital malformations on ultrasonographic examination. This boy was born by vaginal delivery at 39 weeks in gestation. His weight, head circumference and height were less than the 3 percentile of gestational age. Apgar score was 7 at 1 minute and 9 at 5 minutes. He showed microcephaly, large forehead, low set ears, hypertelorism, flat nasal bridge, and micrognathia. The genitalia was ambiguous, showing severe hypoplasia of the penis. The anus was ectopic, displaced anteriorly from its normal position but with a normal opening and function. Neurologic examination was normal. Echocardiogram done at 2 weeks of life showed a persistent foramen ovale and a ventriculoseptal defect (type II) with increased pulmonary hypertension. MRI examination of the brain showed poorly demarcating corpus callosum suspecting agenesis of corpus callosum. Also, cerebellar vermis was small and hypoplastic, mimicking a variant form of Dandy-Walker malformation. MRI of the pelvis showed a tubular structure in pelvic cavity, suspicious of uterine remnant, between urinary bladder and rectum, and a inguinal hernia was noted in the left side. In the abdominal cavity enlarged adrenal glands were noted, and hormonal study showed elevated 17-α-OH-progesterone (168.9 ng/ml) with normal 17-KS and 17-OHCS levels. Gastrointestinal and urogenital system were otherwise normal. Cytogenetic analysis of the parents were both normal but the newborn showed 46, XY, r(13), de novo, with deletion points q32.2→qter. Our findings are in line with previous reports about chromosome 13 deletions, in which loss of the critical point leads to major malformations like brain anomalies and ambiguous genitalia.
A Simple ZVZCS Sustain Driver for a Plasma Display Panel
Kang-Hyun Yi,Sang-Kyoo Han,Seong-Wook Choi,Chong-Eun Kim,Gun-Woo Moon 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.4
A high efficiency and low cost sustain driver for a plasma display panel (PDP) utilizing a current pumping method is proposed. The main concept of the proposed circuit is using the current source to charge and discharge the panel. As a result, all power switches can achieve zero voltage switching (ZVS) and every auxiliary switch can also achieve zero current switching (ZCS). Since the inductor current can compensate for the discharge current, the current stress of all the power switches can be reduced considerably. Furthermore, it has features such as a simpler structure, less mass, lower cost, and lower electromagnetic interference than in previous circuits.
A simple energy recovery circuit with current-fed type for plasma display panel (PDP)
이강현(Kang-Hyun Yi),한상규(Sang-Kyoo Han),최성욱(Seong-Wook Choi),김정은(Chong-Eun Kim),문건우(Gun-Woo Moon) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
High efficiency and low cost sustain driver for plasma display panel (PDP) with current fed is proposed. Main concept of the proposed circuit is using the current source to charge and discharge panel. As a result, all power switches can achieve the zero voltage switching (ZVS) and every auxiliary switch can also do the zero current switching (ZCS). Moreover, since the inductor current can compensate the discharge current, the current stress of all power switches can be reduced considerably. Furthermore, it has features as a simpler structure, less mass, less cost, and lower electromagnetic interference than prior circuit.
개심술 전후에 발견된 기관 협착증 2 례에 대한 마취경험
김성오,김종성,김성덕,이상돈 대한마취과학회 1995 Korean Journal of Anesthesiology Vol.28 No.5
Long, severe, and fixed congenital tracheal stenosis is a life-threatening anornaly and not relieved by endotracheal or tracheostomy intubation. The rarity of congenital tracheal stenosis has not allowed sufficient experience for the development of standard treatment methods, therefore, congenital tracheal stenosis still carries significant morbidity, with a mortality rate as high as 70%. We have followed up two patients managed by different methods, but O(2)-isoflurane-Fentanyl-vecuronium was used for induction and maintenace. We experienced one case of tracheoplasty with pericardial patch for extensive tracheal stenosis under extracorporeal circulation, and one case of slide tracheoplasty for funnel-shaped tracheal stenosis. The first case was noticed incidentally during anesthetic induction and the vocal cord was visible but 2.5 mm sized tube could not be advanced,so we used the guide wire which is used for central line, then we could intubate with some resistance. Tracheostomy was not allowed due to diffuse tracheal stenosis reaching from cricoid cartilage to carina. During the extra corporial circulation, the guide wire was inserted from operation field, and 3.5 mm sized tube was introduced via guide wire by anesthesiologist. After operation the grannulation tissue that obstructing airway, was noticed by bronchoscopy, and was removed, then he was weaned from ventilator successfully. The second case was discovered due to diffcult weaning from ventilator after open heart surgery. the bronchogrm showed right tracheal bronchus and diffuse tracheal stenosis from T2 to carina. He was ventilated initially with 4.0 mm sized endotracheal tube, and ventilated intermittently with other 2.5 mm sized endotracheal tube from operation field during tracheal anastomosis. After operation, he died with increased airway pressure and airway bleeding.
박인양(In Yang Park),이종승(Chong Seong Yi),신종철(Jong Chul Shin),이지현(Ji Hyun Lee),이현정(Hyun Jeong Lee),강대호(Dae Ho Kang),김사진(Sa Jin Kim),김수평(Soo Pyung Kim) 대한산부인과학회 2002 Obstetrics & Gynecology Science Vol.45 No.3
N/A Objective: Much emphasis has been placed on the morbidity and mortality of infants delivered before 32 weeks of gestation, including intraventricular hemorrhage and respiratory distress. The incidence of these complications and their association with long-term sequelae are well defined. This information is important, especially when decisions regarding delivery have to be made. Although delivery at >32 weeks of gestation may be considered free of serious sequelae of prematurity, morbidities are still associated with delivery between 32 and 36 weeks of gestation. The purpose of this study is to determine the incidence of minor morbidities associated with premature delivery between 32 and 36 weeks of gestation. We tried to find out the proper time to decrease the minor perinatal morbidities and the adverse effect of tocolytic treatment. Met hod: The study population is consisted of infants delivered between 20 and 36 weeks of gestation at Kang Nam St. Mary's hospital from 1995 to 1999. Maternal and neonatal charts were abstracted for maternal past history, pregnancy complications and neonatal demographics comparing complications present at each gestational week. Mann-Whitney test and χ2 test were used to assess statistical significance. Results: There was no significant difference of delivery time due to maternal age and parity. There was increased risk of low Apgar score and low birth weight before 34 weeks of gestation. Neonatal death was significantly high before 32 weeks of gestation. Neonatal death, sepsis, intraventricular hemorrhage, respiratory distress, ventilatory equipment use was significantly high before 32-33 weeks of gestation. Hypothermia, feeding difficulty, jaundice, NICU admission was significantly high before 30, 32, 35, 35 weeks of gestation. So it is approved that minor perinatal morbidity was decreased after 34-35 weeks of gestation. Conclusion: Major morbidity was significantly high before 32-33 weeks of gestation and Minor morbidity was significantly high before 34 weeks of gestation. Therefore considering of minor and major morbidity, it is reasonable to postpone the preterm delivery until 34 weeks of gestation.