• Journal of Chest Surgery
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• v.28 no.6
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• pp.637-639
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• 1995

Congenital esophageal anomaly with or without tracheoesophageal fistula was rare congenital disease.We experienced 6 cases of congenital esophageal atresia, with tracheoesophageal fistula [5 cases and one esophageal atresia without fistula, were treated in the Department of Thoracic and Cardiovascular Surgery, Kangnam Sacred Heart Hospital, Hallym university, from May, 1992 to July, 1994. The type of four cases were upper blind pouch and lower tracheo or broncho esophageal fistula and one case H-type fistula with no esophageal atresia, and the one case was esophageal atresia without fistula. We performed modified Haight`s method, one case was primary closure with feeding gastrostomy and stomach interposition. Three were died due to respiratory failure on 7 and 9th postoperative days.Three were recovered uneventfully.

• IEMEK Journal of Embedded Systems and Applications
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• v.8 no.3
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• pp.145-153
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• 2013

Virtualization technology has been applied in IA-32 based server or desktop systems. Recently it has been applied in ARM based mobile systems. Virtualization technology provides many useful features that are not possible in operating system level such as isolation, interposition, encapsulation and portability. In this research, we implement an ARM based VMM(Virtual Machine Monitor) by using the following techniques. First, we use "emulation" to virtualize the processor. Second, we use "shadow page tables" to virtualize the memory. Finally, we use a simple "pass-through I/O" to virtualize the device. Currently the VMM runs ARM Linux kernel 3.4.4 on a BeagleBoard-xM, and we evaluated the performance of the VMM using lmbench and dhrystone. The result of the evaluation shows that our VMM is slower than Xen on ARM that is implemented using paravirtualization but has good performance among the VMMs using full-virtualization.

• Journal of Korean Foot and Ankle Society
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• v.15 no.3
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• pp.179-182
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• 2011

Naviculocuneiform coalition is one of uncommon tarsal coalitions and especially symptomatic cases which need operative treatment are rare. Authors report 2 cases of pediatric naviculocuneiform patients who showed symptomatic condition as mainly pain. Plain radiographs, computed tomography or magnetic resolution imaging study showed bony bridge in naviculo-medial cuneiform joint. After over six months conservative treatment, excision of coalition and interposition $Tisseel^{(R)}$ was performed for motion preservation and relief of pain.

• Journal of Chest Surgery
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• v.28 no.10
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• pp.935-938
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• 1995

Two cases of severe caustic injury of the hypopharynx, esophagus, and stomach are presented. Restoration of digestive continuity was accomplished by retrosternal isoperistaltic interposition of the transverse and left colon on the post-injury 73rd and 66th day respectively. The upper oro-colon continuity was made by a cervical approach, a vertical incision at the posterior hypopharyngeal wall, and interrupted one-layer sutures using 3-0 Dacron suture materials. The distal continuity was made by colojejunostomy between the transposed colon and proximal jejunum. There was no event after the operation in both cases. The posterior vertical hypopharyngotomy and hypopharyngocolostomy at the early post-injury period may be the preferred procedure to obtain normal deglutition in patients with esophageal stricture associated with hypopharyngeal injury.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.325-327
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• 2006

현재 사용되고 있는 운영체제들은 그들의 기능을 확장하거나 교체하기 위해서 kernel extension을 사용해 왔다. 일반적으로 이러한 kernel extension들은 커널과 같은 주소공간에서 실행하기 때문에, 그것에서 발생하는 오류(fault)로 인해 전체 시스템이 망가지는 결과를 초래할 위험이 있다. 그래서 kernel extension의 안전한 실행에 관한 연구들은 kernel extension에서 발생한 오류를 전체 시스템으로부터 고립시키는 것이 주목적이었다. 하지만 이러한 방법들은 kernel extension의 어셈블리어로 된 코드를 분석하거나 사용하고 있는 커널의 소스 코드를 수정을 필요로 한다. 본 논문은 Sentry라는 kernel extension을 감시하기 위한 인터포지션 서비스를 제안한다. Sentry를 사용하기 위해서 별도의 커널 코드를 수정할 필요도 없으며, 이미 사용하고 있는 리눅스와 호환될 수 있는 특징을 지니고 있다. 그리고 kernel extension의 소스코드 및 어셈블리 코드에 대한 분석 없이 바이너리 파일을 직접 수정하여 kernel extension을 모니터링 할 수 있도록 한다. 게다가 Sentry는 재구성이 가능하기 때문에 얼마든지 kernel extension에 대한 보호정책을 동적으로 바꿀 수 있다.

• Journal of Chest Surgery
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• v.25 no.12
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• pp.1492-1496
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• 1992

Takayasu`s arteritis is a nonspecific inflammatory vascular disease of unknown origin. It most often cuases stenosis of the aorta or its branch arteries with ischemic changes in the organs supplied, but the vessels inside these organs are not directly involved. From 1983 to 1991, we performed operation on 6 patients with Takayasu`s arteritis. There were 6 female patients ranging in age from 17 years to 36 years. Symptoms included headache, dizzness, visual disturbance, and motor weakness or pain of arm. In 5 cases, bypass graft arised from ascening aorta[ventral aorta] were done, and in one, stenotic segments of left subclavian and vertebral arteries were resected an graft interposition done. Follow-up has been 62.4$\pm$34.8 months[ranging from 11 to 113 months], results of each patient were exellent, except one postoperative death.

• Journal of Chest Surgery
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• v.24 no.12
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• pp.1232-1237
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• 1991

The cervical esophageal stricture has various surgical modalities and difficulties in reconstruction. We had experienced a case of successful reconstruction of the cervical esophageal restenosis using the free jejunal graft, on 30 year old man had had esophageal stricture after ingestion of lye. He had undergone colon interposition[esophagocologastrostomy] with left colon feeding gastrostomy. But restenosis was occurred just above of the cervical esophagocolostomy site several times of balloon dilatation were failed. So, we decided to use of the free jejunal graft. The free jejunal graft was isolated about 15cm length with it`s vascular arcades. The graft was irrigated with the mixed solution as isotonic saline, heparin and papaverine chloride. The artery of graft was anastomosed to the branch of the external carotid artery in end to side with continuous sutures of the 8.0 Prolene. The vein of the graft was anastomosed to the branch of the anterior facial vein in end to end with continuous sutures of the 8.0 prolene. Postoperative course was uneventful and the patient was discharged after removal of the tracheostomy cannula and gastrostomy tube.

• Journal of Chest Surgery
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• v.27 no.12
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• pp.1042-1046
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• 1994

We experienced a case of traumatic aneurysm of descending thoracic aorta by an automobile accident. The patient was 23-year-old-male with a traumatic aortic aneurysm [6x12cm] on the descending thoracic aorta just distal to the origin of the left subclavian artery. Exposure was obtained through a left posterolateral thoracotomy incision in the fourth intercostal space and then partial femoro-femoral cardiopulmonary bypass was established.After aortic cross- clamping, the aneurysmal sac was opened and repaired with interposition of Dacron vascular graft and aortic cross-clamping period lasted for 100 minutes. Postoperative bleeding and vocal cord paralysis were complicated, but bleeding was controlled by reoperation and vocal cord paralysis was improved. Follow up was continued for 14months and postoperative course was uneventful.

• Journal of Chest Surgery
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• v.24 no.7
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• pp.725-731
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• 1991

Four patients with traumatic rupture of aorta underwent operative repair at Seoul national university hospital. All cases were confirmed by preoperative aortography. Rupture site was aortic isthmus or just distal to it. Operations were somewhat delayed due to the low degree of suspicion and difficulties in diagnosis: ranging from 5 hours to 8 days. Operation was performed as same manners in all cases: resection of the ruptured portion and tubular woven dacron graft interposition in conjunction with shunt or bypass procedures, TDMAC-Heparin shunt between ascending and descending aorta was used in 3 cases, and LA-femoral centrifugal pump was used in one case. There were no intraoperative or postoperative mortality. Hoarseness was developed in all patients but paraplegia or other significant complications were not found in any of patients. We concluded that 1] high degree of suspicion is essential in the early diagnosis and treatment of traumatic aortic rupture and 2] any kind of shunt or bypass procedure is necessary in operative repair of traumatic aortic rupture and use of centrifugal pump without systemic heparinization is easier and safer procedure than others for the maintenance of adequate distal flow.

• Journal of Chest Surgery
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• v.32 no.10
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• pp.943-946
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• 1999

There was no significant difference in morbidity and mortality between those that received simultaneous operation for coronary artery disease and peripheral vascular disease versus those that received coronary artery bypass graft alone. Simultaneous operation is also cost effective. A 46 year-old patient with resting chest pain and intermittent claudication was diagnosed as unstable angina and Leriche's syndrome. We performed simultaneous revascularization for coronary artery stenosis with internal mammary artery and right gastroepiploic artery and a bifurcated vascular graft interposition between in the aorta, left common iliac and right femoral arteries for Leriche's syndrome. The postoperative coronary angiogram and aortogram revealed a good patency of the arterial conduits and vascular graft. He has been followed for 12 months without any problem.