http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이경환,Lee, Gyeong-Hwan 한국과학기술단체총연합회 1986 과학과 기술 Vol.19 No.10
이 글은 지난 1985년 9월부터 1986년 3월까지 6개월간 한국과학재단의 지원을 받아 「지적소유권의 세계 동향과 대응전략에 관한 연구」라는 제목으로 한국 소프트웨어개발 연구조합 연구팀인 이경환(연구책임자) 교수외 6명의 연구자들이 연구한 결과보고 내용의 일부이다. <편집자 주>
이경환,김익태,김재수 조선대학교 공학기술연구원 2022 공학기술논문지 Vol.15 No.4
The reciprocating flow in an Inertance Pulse Tube Cryocooler (IPTC) with the piston movement in a compression chamber was modeled numerically and analyzed. The numerical modeling on the axisymmetric two-dimensional thermal fluid motion was applied to the reciprocating flow in an IPTC and compared the transient velocity field and temperature in the IPTC. The modeling of IPTC consists of the flow and heat transfer in the cylinder of compressor, a regenerator with a porous media, a pulse tube, 2 heat exchangers with a porous media, a long inertance, and a reservoir. The crevice between free piston and cylinder wall in the compressor was also modeled to consider the effect of leaked gas through the crevice during compression and expansion of cylinder volume. It is investigated the effect of volume ratio between the back space of piston and the compression space on the cooling performance or energy efficiency of IPTC was investigated with the temperature and flow distribution.
소아 장중첩증 환자의 방사선과적 정복시 바륨관장법과 통기법의 압력에 관한고찰
이경환 대한영상의학회 1989 대한영상의학회지 Vol.25 No.4
There are many methods of teatment of the intussusception in children including surgery barium reduction air reduction and saline enema under ultrasonographic monitoring. Among them barium reduction and air reduction have been used widely as nonsurgical method of treatment in radiologic department. During barium reduction the bottle filled with barium solution must not be elevated over a 3 feet from the operating table. In air reduction diagnostic pressure is about 60 mmHg and pressure during reduction usually is maintained between 90 mmHg and 130 mmHg. The authors have studied about pressure difference of barium solution by changing height of the bottle filled with barium solution and have compared with pressure in air reduction, The results are as follows. 1. Pressure of 20 w/v% barium solution at the 60 cm height is 44.4 mmHg and 69.6mm Hg at the 90cm height. 2. Pressure of 40w/v % barium solution at the 60 cm height is 51.4 mmHg and 80.1 mmHg at the 90 cm height. 3. Pressure of 40 w/v % barium solution at the 90cm height is much lower than the pressure maintained during air reduction and this difference in pressure may be noe of the causes of low reduction rate in barium reduction than air reduction. 4. The pressure gradient per 10 cm height is about 8.45 mmHg in 20 w/v % barium solution. about 9.21 mmHg in 30 w/v % barium solution and about 9.72 mm Hg 40 w/v % barium solution.5. Intraluminal pressure difference between the barium reduction and the air reduction is probaly one of the major causes of rapid diagnosis and high reduction rate in the air reduction.
이경환 대한영상의학회 1993 대한영상의학회지 Vol.29 No.1
In order to study the vascular manifestation of Behcet's disease, authors analized retrospectively the radiollogical and clinical features of 22 patients who were diagnosed as vasculo-Behcet's disease. The angiographic findings were aneurysm formation and occlusion of artery and vein. Aneurysm formations were found at common carotid artery (3 cases), abdominal aorta (2 cases), aortic arch (2 cases), innominate artery (2 cases) etc. Arterial occlusions were found at pulmonary artery (2 cases), subclavian artery(1 cases), brachial artery (1 case), common femoral artery (1 case) etc. Venous occlusions were found at the veins of the lower extremities including superficial femoral vein (18cases), IVC (2 cases), SVC(1 case), and lateral sinus (1 case). The clinical features were similar to that of Behcet's disease without vascular involvement, but incidencd of vacular involvement was more common in men and interval between the onset of the disease and vascular symptoms was 1-16 years (77%) and common associated symptoms were oral ulcers(59%) and skin lesions (55%). Angiographically the morphological features of vasculo-Behcet's disease are not specific, but vascular radiologist must be aware of vascular involvement by Behcet's disease in differential diagnosis when occlusive changes in the venous or arterial tree, or aneurysm formation are seen in young patients.
이경환,류갑상 한국융합학회 2020 한국융합학회논문지 Vol.11 No.6
In the field of public informatization maintenance business, the attacks of external illegal users such as unauthorized leakage, destruction, and alteration due to intentional or inadequate management of personal information are increasing. In order to prevent such security incidents in advance, it is necessary to develop and quantitatively manage SLA indicators. This study presents the privacy SLA indicators and suggests specific methods such as information collection method and timing of the privacy SLA indicators. In order to confirm the validity and reliability of the proposed SLA indicators, an online survey was conducted with a group of experts. As a result, it was evaluated that compliance rate of personal information destruction and compliance rate of personal information protection system would be effective when applied to new and revised SLA indicators in terms of importance and validity. In the future, using SLA indicators for personal information protection as a standard for public information maintenance will contribute to improving SW quality and securing safety.