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- 저자 : 장현호(Hyun Ho Chang) (검색결과 46 건)
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악교정수술 환자에 있어서 Enflurane, isoflurane 흡입마취제가 간기능에 단기간 미치는 영향
장현호,김재승,강재현,이승호,Chang, Hyun-Ho,Kim, Jae-Seung,Kang, Jae-Hyun,Lee, Seung-Ho 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.4
Isoflurane and enflurane are currently used on orthognathic surgery in Korea. Since starting to use enflurane and isoflurane in orthognathic surgery, we have questioned their effect on liver function. Many studies have reported liver function after enflurane and isoflurane anesthesia. Although both enflurane and isoflurane are less hepatotoxic than halothane, some cases of liver dysfunction have been reported after enflurane and isoflurane anesthesia. And, we know that isoflurane is less hepatotoxic than its predecessors, enflurane. But, fulminant liver failure and necrosis were also reported after isoflurane anesthesia. The purpose of this study was to compare immediate liver function in healthy orthognathic surgical patients receiving enflurane or isoflurane anesthesia. To assess the effect of enflurane and isoflurane on liver function, we measured pre-and post-operative serum concentrations of aspartate aminotransferase(AST), and alanine aminotransferase(ALT), alkaline phosphatase(ALP), total bilirubin(Tbil).
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김재승(Jae Seung, Kim),장현호(Hyun Ho Chang),김만진(Man Jin Kim),한승윤(Seung Yun Han) 대한구강악안면외과학회 1995 대한구강악안면외과학회지 Vol.21 No.4
The methods of management ofr condylar fractures have been investigated and improved for several decades. The methods which have been used up to date are classified broadly into conservative and surgical treatment. Conservative treatment is planned to restore normal function through intermaxillary fixation and early exercises of mandibular movement. It is chosen in the cases of children s or growing adolescent s fractures and adult s intracapsular or high condylar fracture. Although long term results proved conservative treatment to be satisfactory, it is impossible to restore the preexisting anatomic relation and it may cause dysfunction or limitation of mandibular movement. So surgical intervention has been advocated for various types of condylar fracture. Until now, most surgical treatments have been undertaken by the following methods such as preauricular or Risdon approach, Nam s method, and lag screw fixation method. All of them are through an extraoral approach, which can cause complications such as facial nerve injury, external scar, and resorption or necrosis of bone fragments. In order to overcome these complications, we attempted an intraoral approach. In this article, the technique and the clinical results of an intraoral approach are presented. We treated 5 patients having subcondylar (4) and low condylar neck (1) fractures with the use of an intraoral approach from May, 1993 to February, 1995. After 3 to 12 months follow-up, we could draw the following conclusions. 1. An intraoral approach has advantages over an extraoral approach ; No facial nerve damage, no facial scar, and the decrease of possibility of necrotic bone change. 2. The 5 patients treated in this technique had a stable occlusion state and all of them had no functional disturbance such as limitation of opening, protrusive and laterotrusive movements. Protrusive and opening deviation was not also noted. 3. Because the intraoral approach has some limitation in gaining enough visibility, it is better to use this method in cases of which fracture line is present below the condylar neck.
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하악골 후방이동 수술후 기도 공간과 두개 및 경추 각도의 변화에 관한 연구
장현호(Hyun Ho Chang),김재승(Jae Seung Kim),이충국(Choong Kook Yi) 대한구강악안면외과학회 2000 대한구강악안면외과학회지 Vol.26 No.2
In the study of craniofacial deformity, it is very important that identifying the factor which can affect the morphology and which is closely related to the morphology, because it can not only improve the comprehension of growth and developmental process but also be applied in growth prediction and treatment modality. Several investigators have already mentioned the characterstics of head posture and airway space in relations to morphologic difference. But it is very meaningful work in clarifying the correlation between morphology, head posture and airway space that observing the change of head posture after morplologic change caused by operation and the change of airway space after same procedure. To investigate above correlation, I selected normal group which is consisted of 43 adults and mandibular prognathism group which is consisted of 47 adults who had been operated by sagittal split ramus osteotomy and were followed up more than 1 year. With their lateral skull radiograghs, reference lines which can evaluate each measuring points and areas without effect of postural change were first determined. And using above reference lines, change of airway space, positional change of tongue and hyoid, change of cranial and cervical angulations were measured. The results obtained from the study were as follows 1. In the change of head posture, the position of tongue and hyoid neighboring to pharynx is more closely related to the reference line of cervical column than to reference line of cranium. 2. After mandibular setback operation, the airway dimension was decreased to 81.6% of preoperative state at 1 month postoperatively and was slightly increased to 89.7% at 1 year postoperatively. 3. Posterior movement of tongue plays important role in decrease of airway dimension and inferior movement of hyoid was closely correlated with posterior movement of tongue. 4. Postoperative anterior movement of mandible, namely, morphologic relapse had correlation with relapse phenomenon of airway dimension. 5. Craniocervical angulation increased postoperatively. Especially in the postoperative early state, there was increased foreward inclination of cervical angulation rather than increase of cranial angulation. But at postoperative 1 year it was observed that cervical inclination was returned to preoperative state and cranial angulation was increased gradually. 6. Increase rate of airway dimension was correlated with the increase of cranial angulation from postoperative 1 month to 1 year. In conclusion, relapse tendency of airway dimension following increase of cranial angulation was found after mandibular setback operation and it is considered that increase of cranial angulation is one of compensatory mechanism in airway maintenance.
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장현호(Hyun Ho Chang),이태경(Tae Kyung Lee),이영인,원제무 대한교통학회 2008 대한교통학회 학술대회지 Vol.59 No.-
국내에 ITS가 도입된 지 20여년의 시간이 경과하였다. 그리고 ITS의 교통정보 수집기술과 더불어 방대한 양의 교통자료를 수집 · 활용할 수 있는 기반이 조성되었다. 대부분의 수집된 교통정보는 실시간 교통정보제공 및 교통운영을 위한 목적으로 활용되고 있다, 반면, ITS의 실시간 자료수집체계를 이용하여 축적된 이력자료(Historical Data)의 관리 기술과 활용 빈도는 낮은 수준이다. 최근에는 이력자료를 유지 · 관리하기 위한 집계자료관리시스템(ADMS, Archlved Data Management System)이 도입되기 시작하면서 이력자료의 활용 가능성은 매우 높아지고 있다. 그러나 방대한 양의 이력자료는 누락자료(missing data)를 포함하고 있기 때문에, 이력자료를 효과적으로 관리 · 활용하기 위해서는 누락자료의 보정처 리가 선행되어야 하며, 이를 위해서는 결측자료 추정기법이 필수적이다. 이러한 누락자료의 대부분은 Loop 검지기의 수명 도달에 따른 교체, 도로공사 등으로 인한 파손으로 발생하게 된다. 대부분의 경우 정상적인 가동까지는 모니터링, 설계, 공사, 준공의 단계를 거침으로 상당한 기간이 요구된다.
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한국인 정상성인에 있어 하악 과두돌기와 오훼돌기 길이의 비율에 관한 연구
장현호(Hyun Ho Chang),이충국(Choong Kook Lee) 대한구강악안면외과학회 1990 대한구강악안면외과학회지 Vol.16 No.1
Mandibular growth results from development of it s five independent skeletal units. It has been reported that there is an intercorrelation between the growth of the condylar and the coronoid processes. This relationship might be one of the most important reference factors in the diagnosis of condylar growth which causes craniofacial deformities. To study the interrelationship between condylar and coronoid processes in a Korean adult s normal face, we selected 42 females and 30 males who have normal faces. With their panoramic views, we measured the length of condylar and coronoid processes. The results were as follows : In Korean adult normal faces : 1. There was a high correlation in the length between the condylar and the coronoid processes unilaterally, and between both condyles and between both coronoides. 2. In both sexes, the absolute length of condylar and coronoid processes between the two groups were significantly different, and absolute lengths of males were higher than those of females. However there was no significant difference in the linear ratio(CON/COR) between the two groups. 3. In the female group, the ratio(CON/COR) was 1.152±0.077, and 1.135±0.081 in the male. The total mean ratio was 1.145±0.079.
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장현호(Hyun Ho Chang),백승걸(Seung Kirl Baek) 대한교통학회 2004 대한교통학회 학술대회지 Vol.46 No.-
Cellular Automata이론을 기반으로하는 CA차량추종모형(이하 CA모형)은 Nagel과 Schreck enberg(1992)에 의해 처음 소개된 후, 국내에서도 기존의 CA모형을 이용한 “미시적교통류 시뮬레이션 시스템 개발에 관한 연구(조중래, 2001)”, “고속도로 돌발상황 영향 분석 교통 시뮬레이션 모형 개발(노정현, 2001)”, “다양한 연속 교통류 구현을 위한 확률파장전파모형의 개발(장현호, 2004)”등의 연구가 소개되었다. 그러나 교통류의 행태를 보다 더 효과적으로 설명하기 위한 CA기반 차로변경모형에 관한 연구는 미흡한 실정이다. 고속도로의 경우에 있어서 차로 이용률(Lane Usage)은 운전자의 특정 차로선호 정도, 통행시간 최적화를 위한 차로변경, 중차량의 영향 등으로 인하여 다르게 나타나며, 차로이용률은 일정하지 않으며 밀도에 따라서 변화한다. 그리고 차로변경에 의한 차로이용률에 의하여 차로별 교통량-밀도관계 또한 다르게 나타난다. 따라서 차량 시뮬레이션을 위해서는 차로변경모형과 더불어 다양한 차로변경형태를 설명하는 차로변경모형의 개발이 필수적이다.
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