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대구 지하철역사 장애인 편의시설 실태분석 및 개선방안에 관한 연구
이재환 대구대학교 산업기술연구소 2013 産業技術硏究 Vol.24 No.1
Disabilities is increasing in modern society after Industrial Revolution. Due to the general public at any time, any number of factors also may be disabled. Participation in society for persons with disabilities should be given the opportunity. But persons with disabilities can not itself engage in social life. Thus, the social structure should have been maintenance of the system for disabilities. Therefor, the purpose of this study was focused on searching for the good device against the handicapped people's facilities out of public transportation, which had done by studying, analyzing representative transportation systems and subway station buildings.
이재환,박상원 한국섬유공학회 1996 한국섬유공학회지 Vol.33 No.9
For the development of economic, automated, and computer-aided manufacturing process of textile printing screen, photocuring of PVA emulsion by argon LASER was studied. The crosslinking-degree of PVA, photosensitized by diazonium salt, was analyzed by gravimetric and IR-spectroscopic method. The exposure time was longer than 4 $\mu$s with 1 W power and 50 $\mu$m spot size for processable crosslinking. The crosslinking behavior of PVA showed typical S-shape kinetics against the cumulative exposure time.
이재환 한국전산구조공학회 1994 한국전산구조공학회논문집 Vol.7 No.1
선박, 자동차, 항공기등 수송체 구조해석에 유한요소법이 사용됨에 따라 초기 설계 후 대형 복합구조물의 해석이 ANSYS, NASTRA등의 범용 유한요소 코드에 의해 수행되고 있다. 설계변경을 시도할 때 설계자의 경험과 인지만으로 대형 구조물의 성능변경을 예측하기는 어렵다. 비록 대형 컴퓨터의 사용으로 구조 재해석이 용이하나 정량적 및 이론적 설계수정방향 없이는 인력과 계산시간 소모를 초래하고 때로는 시간 제약으로 충분한 재해석을 못할 수가 있다. 이때 긴요하게 사용될 수 있는 정보는 민감도로서 설계변수 변화에 대한 구조응답 변화를 수치적으로 나타내므로 설계변경에 도움을 줄 수 있다. 본 논문에서 계산된 정확한 민감도는 선체데크구조와 수송체구조물 프레임 강성도를 설계 변수로 하였으며 구조물 진동저감 설계에 사용될 수 있다. 즉 유한요소법에 의한 구조 재해석에 의하지 않고 민감도 값으로 구조 진동변위 증감을 예측할 수 있음이 예제로 보여지고 있다. Design sensitivity analysis method for the vibration of vehicle structure is developed using adjoint variable method. A variational approach with complex response method is used to derive sensitivity expression. To evaluate sensitivity, FEM analysis of ship deck and vehicle structure are performed using MSC/NASTRAN installed in the super computer CRAY2S, and sensitivity computation is performed by PC. The accuracy of sensitivity is verified by the results of finite difference method. When compared to structural analysis time on CRAY2S, sensitivity computation is remarkably economical. The sensitivity of vehicle frame can be used to reduce the vibration responses such as displacement and acceleration of vehicle.
Role of echocardiography in clinical hypertension
이재환,박재형 대한고혈압학회 2015 Clinical Hypertension Vol.21 No.8
Hypertension is amajorand correctable cardiovascular risk factor. The correct diagnosisofhypertension andprecise assessment of cardiovascular risk are essential to give proper treatment inpatientswithhypertension. Althoughechocardiography is the second-line study in the evaluationofhypertensivepatients, it givesmany clues suggestingbadprognosis associated with hypertension, including increased left ventricular (LV) mass, decreasedLV systolic function, impaired LV diastolic function, and increased left atrial size anddecreased function. Alongwith conventional echocardiographic methods, tissueDoppler imaging, three-dimensional echocardiography, and strain echocardiography arenewer echocardiographic modalities inthe evaluation of hypertensive patients in the current echocardiographic laboratories.Understandingconventional andnewer echocardiographicparameters is important inthediagnosis andassessmentof cardiovascular risk inhypertensivepatients.