http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김지상 ( Kim Jee-sang ),오병환 ( Oh Byung-hwan ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
This paper deals with an assessment of health monitoring of normal and high strength concrete structures using rebound hammer test and ultrasonic pulse velocity method. There are also few experimental results on the NDT of deteriorated concrete. In this paper, some on-going experimental results are summarized, in which the variables are compressive strength of concrete, age, degree of deterioration and load histories and correcting the surface-opening crack depth by ultrasonic pulse velocity in reinforcement concrete structures. These results are expected to use basic technique of concrete structure maintaining
Propofol에 의한 전신마취 후 회복 시 발생한 근경련 -증례 보고-
김병환,정성수,Kim, Byung-Hwan,Chung, Sung-Su 대한치과마취과학회 2010 Journal of Dental Anesthesia and Pain Medicine Vol.10 No.1
There are a few case reports describing persistent seizure following propofol. A 45-year-old female underwent operation of mastoidectomy and tympanoplasty. She had no personal or family history of epilepsy. Anesthesia was induced with propofol and rocuronium, and maintained with sevoflurane-remifentanil after tracheal intubation. Any event was not noted during surgery. Seizure-like movement and shivering were developed after surgery in recovery room. Symptom was relieved by benzodiazepines, especially lorazepam. She was discharged in the 9th postoperative days without any sequelae.
안테나 소형화를 위한 Co₂ 페라이트의 마이크로파 특성
김재식(Jae-Sik Kim),최의선(Eui-Sun Choi),김강(Kang Kim),이영희(Young-Hie Lee),송성호(Sung-Ho Song),안종복(Jong-Bok Ahn),김병환(Byung-Hwan Kim),최지영(Ji-Young Choi) 대한전기학회 2011 전기학회논문지 Vol.60 No.12
The sintering behavior and microwave properties of ferrite (Ba3Co2-2xZn2xFe24O41 ceramics) were investigated for microwave applications. Also PIFA type antenna with ferrite was simulated. All samples were prepared by the solid state reaction method and sintered at 1350℃. All ceramics had relatively density above of 92% compare with theoretical density of Ba₃Co₂Fe24O41 ceramics. From the XRD pattens, the Z-type phase was existed as main phase in Ba₃Co2-2xZn2xFe24O41 ceramics. The permittivity and permeability of Ba₃Co2-2xZn2xFe24O41 ceramics were increased with Zn additions and decreased rapidly over frequency of 200~600 ㎒. Several PIFA type antennas with ferrite and FR4 were simulated. All antenna structure had return loss of less than -10 ㏈ at each resonant frequency. Simulated antenna using both ferrite and FR4 showed size reduction of 25% without a significant decrement of efficiency.
김지상 ( Kim Jee-sang ),오병환 ( Oh Byung-hwan ),백낙승 ( Paek Nak-seung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
This paper deals with an assessment of compressive strength of normal and high strength concrete using rebound hammer test and ultrasonic wave method. Most existing formulas for strength evaluation using NDT have been obtained on the experimental results of normal strength concrete. There are also few experimental results on the NDT of deteriorated concrete. In this paper, some on-going experimental results are summarized, in which the variables are compressive strength of concrete, age, degree of deterioration and load histories. It is found that some refinements are required assessment of compressive strength in existing concrete structures when rebound hammer and ultrasonic wave method are applied.
초음파 펄스를 이용한 철근콘크리트 구조물의 균열 깊이 측정에 관한 연구
오병환 ( Oh Byung-hwan ),김지상 ( Kim Zi-sang ),김세훈 ( Kim Se-hoon ),백낙승 ( Paek Nak-seung ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
Ultrasonic pulse velocity method is employed for evaluation of crack depth in concrete structures. Due to the heterogeneous nature of concrete and the indirect transmission arrangement for the transit time measurement through the surface-opening cracks in concrete structures, ultrasonic pulse velocity has so many variations as crack depths and transmission length vary. In this study, ultrasonic pulse velocity method is investigated to evaluate the surface-opening crack depth of concrete slabs, reinforced concrete slabs, reinforced concrete flexural members. A resonable method is presented to detect the crack depth of concrete structures.
[제4분과/구조거동/재료Ⅱ] 반복하중을 받는 철근콘크리트의 부착슬립 모델
오병환(Oh Byung Hwan),김세훈(Kim Se Hoon),김지상(Kim Ji Sang) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
The crack widths of reinforced concrete flexural members are influenced by repetitive fatigue loadings. The bond stress-slip relation is necessary to estimate these crack widths realistically. The purpose of the present study is, therefore, to propose a realistic model for bond stress-slip relation under repeated loading. To this end, several series of tests were conducted to explore the bond-slip behavior under repeated loadings. Three different bond stress levels with various number of load cycles were considered in the tests. The present tests indicate that the bond strength and the slip at peak bond stress are not influenced much by repeated loading if bond failure docs not occur. However, the values of loaded slip and residual slip increase with the increase of load cycles. The bond stress after repeated loading approaches the ultimate bond stress under monotonic loading and the increase of bond stress after repeated loading becomes sharper as the number of repeated loads increases. The bond stress-slip relation after repeated loading was derived as a function of residual slip, bond stress level. and the number of load cycles. The models for slip and residual slip were also derived from the present test data.
콘크리트 해양구조물(海洋構造物)의 피로거동(疲勞擧動)과 확률론적(確率論的) 피로해석(疲勞解析)
오병환,김지상,Oh, Byung Hwan,Kim, Jee Sang 대한토목학회 1988 대한토목학회논문집 Vol.8 No.3
Recently, the offshore structures are increasingly constructed to explore the natural resources. These offshore structures are to be designed to resist the repetitive wave forces. A probabilistic method for the fatigue analysis of offshore concrete structures is presented in this study. The present spectral fatigue analysis calculates wave forces first and then the transfer functions for unit waves from which stress spectra are determined. The calculated fatigue stresses may then be used to evaluate the fatigue damage of concrete structures. A simplified model for the estimation of fatigue damage of the structures, which employs only the probabilistic moments of the peak stress distribution without direct integration, is also proposed. The present study allows more realistic fatigue analysis of offshore concrete structures. 최근들어 에너지의 개발을 위한 노력으로 해양구조물(海洋構造物)의 건설(建設)이 증가되고 있다. 이러한 해양구조물(海洋構造物)은 파랑(波浪)의 반복적(反復的)임 작용으로 피로하중(疲勞荷重)에 대한 고려가 필요하게 된다. 본(本) 논문(論文)에서는 콘크리트 해양구조물(海洋構造物)의 합리적(合理的)인 피로해석방법을 정립하기 위한 연구(硏究)를 수행하였다. 본(本) 논문(論文)에서 연구된 피로해석방법은 스펙트럼해석방법으로서, 우선 파력(波力)을 계산하고, 단위파랑(單位波浪)에 대한 전달함수를 계산하며 이로부터 응력스펙트럼을 계산하여 콘크리트의 피로거동에 근거한 피로손상을 계산한다. 또한, 본 논문에서는 피로손상계산시 요구되는 첨두응력분포 곡선하의 면적에 대한 직접 적분을 수행하지 않고, 첨두응력 분포곡선의 각 확률모멘트를 이용하여 피로손상을 계산할 수 있는 단순해석모델을 유도하여 제안하였다. 본(本) 논문(論文)은 콘크리트 해양구조물의 피로설계(疲勞設計) 위한 실제적인 피로해석방법을 제시하고 있다.
오병환 ( Oh Byung-hwan ),신경준 ( Shin Kyung-joon ),김광수 ( Kim Kwang-soo ),김지상 ( Kim Ji-sang ),이상철 ( Lee Sang-cheol ) 한국구조물진단유지관리공학회 2001 한국구조물진단유지관리공학회 논문집 Vol.5 No.4
The condition assessment of bridges is one of the important procedures in the safety evaluation of the structures. The current inspection guideline is rather ambiguous and vague so that the inspection results based on the existing guidelines are highly subjective and varing from person to person and even day to day for a given person. It is therefore, necessary to improve the current inspection criteria in order to provide consistent results in safety assessment. To circumvent possible inconsistencies in inspection and rating of bridge components, the revised criteria have been proposed in this study. The proposed guideline and criteria may be efficiently used for the realistic and consistent assessment of bridge structures.