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강대웅,정지용,윤나라,안치용,김종오,신병철,정종훈,김현리 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2
Background: Some cases of QT interval, corrected QT interval (QTc), QT dispersion (QTd) and corrected QT dispersion (QTcd) have been reported in ESRD, but these results are variable and the influence of a hemodialysis is still controversial, In this study, we investigated the effect of hemodialysis on QT and QTc interval and QT and QTc dispersion in patients with ESRD 15 min before and 15 minute after each hemodialysis. Methods: Sixty-seven patients with ESRD (men 33 & women 34) on three-times stable hemodialysis (>3 months) were randomly enrolled. Fifty control subjects with a similar age and normal renal function were enrolled from this hospital. Routine biochemical studies were measured pre- and post dialysis, at the time of the ECG. Plasma Na+, K+, BUN, creatinine, ionized calcium and phosphate were checked. Twelve-lead electrocardiographs were performed at 10㎜/mv and 50㎜/s using a HewIett-Packard Pagewriter 100, before and after a single hemodialysis session.The QT interval was measured from the onset of the QRS complex to the end of the T wave. If the end of the T wave was not clear in a particular lead then it was excluded from analysis. When U waves were present, the end of the T wave was taken as the nadir between the T and U waves. Each QT interval was corrected for heart rate using Bazett's formula (QTc==QT/√(RR)) (ms). The difference between maximal and minimal QT interval duration was defined as QT dispersion (QTd) in each of the 12 leads. Result: This study demonstrates that QT, QTd, QTcd is higher in hemodialysis patients compared with control subjects, and QT and QTd rise postdialysis to levels comparable to those seen acutely following myocardial infarction, when patients are at greatly increased risk of potentially fatal ventricular arrhythmias, Conclusions: QT interval and QT dispersion, markers of risk for arrhythmias and sudden death, are elevated in hemodialysis patients, and rise postdialysis. QT interval and QT dispersion is an easily obtainable, noninvasive, simple, inexpensive, and widely available method of risk stratification in uremic patients receiving chronic dialysis. Additional studies are needed to clarity whether increased postdialysis QT dispersion results in an increased occurrence of arrhythmias.
황오열,박치영,김용배,안희창 大韓成形外科學會 1987 Archives of Plastic Surgery Vol.14 No.3
Most mandibulr reconstructions are performed primarily or secondarily for bony defects caused by injuries or removal of tumors. An autogenous bone greft is still the method of choice for the restoration of mandibular defec. But a conventional autogenous free bone graft does not possess an intact blood supply and is dependent on local nutrition to survive. Severely scarred or radiated tissue are unfavorable beds for bone graft and even more the risk of resorption and infection is inceased in these kinds of a pooly vascularized bed. To overcome this difficulty, free vascularized bone graft has been tried with microsurgical gical technuque. A free vascularized bone graft has significantly higher rate of survival, with less resorption and higher resistance to infextion than a connentional free bone graft. A free vascularized iliac bone graft pedicled on deep circumflex iliac vessels is used widely, as it have many advantages such as, availability of large bloc of composite tissue, simplicity of donor dissection, large and long vascular pedicle and few donor site morbidity. In this paper, we represent 4 cases of reconstruction of wide mandibular defects using free vascularized iliac bone graft and free dsteocutaneous groin flap, and review the characteristics of gunshot wound. The result is satisfactory.
Alternative Alert System for Cyanobacterial Bloom, Using Phycocyanin as a Level Determinant
Ahn, Chi-Yong,Joung, Seung-Hyun,Yoon, Sook-Kyoung,Oh, Hee-Mock The Microbiological Society of Korea 2007 The journal of microbiology Vol.45 No.2
Chlorophyll ${\alpha}$ concentration and cyanobacterial cell density are regularly employed as dual criteria for determinations of the alert level for cyanobacterial bloom. However, chlorophyll ${\alpha}$ is not confined only to the cyanobacteria, but is found universally in eukaryotic algae. Furthermore, the determination of cyanobacterial cell counts is notoriously difficult, and is unduly dependent on individual variation and trained skill. A cyanobacteria-specific parameter other than the cell count or chlorophyll ${\alpha}$ concentration is, accordingly, required in order to improve the present cyanobacterial bloom alert system. Phycocyanin has been shown to exhibit a strong correlation with a variety of bloom-related factors. This may allow for the current alert system criteria to be replaced by a three-stage alert system based on phycocyanin concentrations of 0.1, 30, and $700\;{\mu}g/L$. This would also be advantageous in that it would become far more simple to conduct measurements without the need for expensive equipment, thereby enabling the monitoring of entire lakes more precisely and frequently. Thus, an alert system with superior predictive ability based on highthroughput phycocyanin measurements appears feasible.
Acute Renal Cortical Necrosis Caused by Tampon
Ahn, Chi-Yong,Yoon, Na-Ra,Kang, Dae-Woong,Park, Kyung-Hee,Kim, Hyong-Sun,Chung, Jong-Hoon,Kim, Hyun-Lee 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2
Acute renal cortical necrosis (RCN) is an uncommon cause of acute renal failure secondary to ischemic necrosis of the renal cortex. The lesions are usually caused by significantly diminished renal arterial perfusion secondary to vascular spasm, micro-vascular injury, or intra-vascular coagulation, In untreated patients, the mortality rate exceeds 60%. Early initiation of dialysis significantly diminishes this rate. But, most patients require dialysis and progress chronic renal failure. Our experience clearly indicates that tampon can produce acute renal cortical necrosis in a normal kidney and we must be aware of this potentially dangerous complication of the tampon.
TiO2-SnO2 나노입자로 부터 고굴절 하드코팅 도막의 제조
안치용 ( Chi Yong Ahn ),김남우 ( Nam Woo Kim ),송기창 ( Ki Chang Song ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.6
TiO2-SnO2 nanoparticles with an average diameter of 3~5 nm were synthesized by hydrolysis of titanium tetraisopropoxide (TTIP) and tin chloride to depress the photocatalytic activity of TiO2 nanoparticles. Organic-inorganic hybrid coating solutions were prepared by reacting the TiO2-SnO2 nanoparticles with 3-glycidoxypropyl trimethoxysilane (GPTMS) by the sol-gel method. The hard coating films with high refractive index were obtained by curing thermally at 120 oC after spin-coating the coating solutions on the polycarbonate (PC) sheets. The coating films from TiO2- SnO2 nanoparticles showed an improved pencil hardness of 3H compared to 2H of the coating films from TiO2 nanoparticles. Besides, the refractive index of the coating films from TiO2-SnO2 nanoparticles enhanced from 1.543 to 1.623 at 633 nm as the Sn/Ti molar ratio increased from 0 to 0.5.