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광섬유의 브릴루앙 산란을 이용한 복합소재 외팔보의 변형율 측정
윤혁진(Hyuk-Jin Yoon),송광용(Kwang-Yong Song),김정석(Jung-Seok Kim),신광복(Kwang-Bok Shin),원종운(Jong-Un Won),나희승(Hee-Seung Na) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
The application of light weight technology using composite in railway structure is actively being realized for the purpose of speed improvement, guarantee of safety, reduction of fuel, improvement of maintenance and etc. Especially, the application of composite to Korean tilting train, light weight train and low floor bus is now generalized and the research of applying the composite to special structure, such as core structure like bogie and the crash absorption equipment, is also being in progress. In this paper, longitudinal strain distribution of composite cantilever beam was measured applying the optical fiber sensors that uses the BOCDA (Brillouin Optical Correlation Domain Analysis) techniques. The 5mm thickness test specimen was fabricated by laminating the glass/epoxy prepreg and curing in the autoclave and the longitudinal strain was measured by increasing the loading from 200g to 2000g at 350㎜ length cantilever. At this moment, the spatial resolution was about 9mm and the strain error was ±20 με.
윤혁진 ( Yoon Hyuk-jin ),김대현 ( Kim Dae-hyun ),김재희 ( Kim Jae Hee ),조봉관 ( Cho Bong-kwan ),박찬호 ( Park Chan-ho ),박순응 ( Park Soon-eung ),김영철 ( Kim Young-chul ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
철도교량, 송전철탑 등 작업자의 접근이 어려운 철도시설물의 정기점검을 효율적으로 수행하기 위하여 무인이동체 등을 이용한 자동화 점검 시스템에 대한 관심이 증가하고 있다. 본 논문에서는 철도 운영환경에서 운용 안전을 확보하며 점검 시나리오 작성에서 점검결과 생성까지의 전 과정을 자동화 하는 자동화 점검 시스템 설계 결과를 소개한다. 고속열차 통과시 열차풍 및 전자기파 등 철도 운영환경의 특성을 측정하였고, 무인이동체에 미치는 주요 영향인자를 분석하여 개발하고자 하는 무인이동체 설계에 반영하였다.
광섬유가 삽입된 철도용 보강토 옹벽의 초기 변형율 측정
윤혁진(Hyuk-Jin Yoon),송광용(Kwang-Yong Song),김대상(Daesang Kim),김기환(Kihwan Kim),김정석(Jung-Seok Kim),권태수(Tae-Soo Kwon),나희승(Hee-Seung Na) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
The research of applying reinforced retaining wall due to support the land pressure that given from train's load has been accomplished actively in domestic area. After the retaining wall has been installed, the collapse or partial destruction that generated by effect of train's vibration and repetitive load of train may be induced. Accordingly in the period of using this, the sufficient durability should be guaranteed and years of durability are one hundred and as these are longer than road structure's, the technique that introduced to wall and monitor the long-term strain is necessary. In this paper, the optical fibre is induced vertically to the reinforced retaining wall and after the subsistence of optical fibre is confirmed, the early strain that applied to optical fibre after insertion is monitored. Before and after the concrete placing, damage feasibility of optical fibre is measured by using OTDR(Optical Time Domain Reflectometer) and after concrete is cultivated, the early strain induced to optical fibre is measured by application of BOCDA (Brillouin Correlation Domain Analysis) system.
혈액투석 중인 말기신부전 환자의 심근손상지표로서 심장트로포닌 - T 와 심장트로포닌 - I 의 임상적 의의
윤혁진(Hyeok Jin Yoon),이상봉(Sang Bong Lee),김양욱(Yang Wook Kim),김영훈(Yeong Hoon Kim),정우영(Woo Yeong Chung),김명유(Myeong You Kim),이정녀(Jeong Nyeo Lee) 대한신장학회 2002 Kidney Research and Clinical Practice Vol.21 No.4
배 경 : 심혈관계질환은 장기 혈액투석 환자의 주된 사망 원인이다. 심혈관계손상지표로 알려진 것 중에는 심장트로포닌-T(cTnT)와 심장트로포닌-I(cTnI)가 있다. 방 법: 56명의 장기 혈액투석 환자(남자 30명, 여자26명)를 대상으로 흡연, 당뇨병, 고혈압, 그리고 협심증성흉통 여부 및 심전도 변화를 조사하였고 혈액투석 직전에 혈액을 채취하여 혈청 마이오글로빈, 크레아틴인산효소(CPK), 젖산탈수소효소(LDH), 총 콜레스테롤, 혈색소, 부갑상선 호르몬, cTnT와 cTnI를 측정하였다. 또한 투석기간과 적절도(Kt/V_urea)를 조사하였다. cTnT는 ECLIA(참고치 ≤0.1 ng/mL)로 측정하였고, cTnI는 OPUS(참고치 ≤0.5 ng/mL)로 측정하였다. 결 과 : 대상 환자 56명 중 심근허혈소견은 32명(57.1%)의 환자에서 나타났고, cTnT 양성률은 32%(18/56), cTnI 양성률은 14%(8/56)였다. cTnT 농도는 심근허혈군 32명 중 12명(37.5%), 비심근허혈군 24명 중 1명(4.2%)에서 증가되어, 심근허혈군에서 비심근허혈군에 비해 cTnT가 의미있게 높은 양성률을 보였다(p=0.001). cTnI는 심근허혈군 32명 중 6명(18.8%), 비심근 허혈군 24명 중 2명(8.3%)에서 증가되었으나 통계적으로 유의한 차이는 없었다. 심근허혈소견에 대한 cTnT의 민감도는 37.5% 특이도는 95.8%였고, cTnI의 민감도는 18.8% 특이도는 91.6%였다. 심근허혈군에서 고혈압, 증가된 LDH와 CPK 및 혈청 마이오글로빈, 40세 이상의 나이, 150 pg/mL 이상의 부갑상선호르몬, 1.4 이하의 Kt/V_urea, 4.0 g/dL 이하의 혈청알부민 등의 소견이 비심근허혈군에 비해 의미있게 높은 빈도를 보였다(p<0.05). cTnT는 LDH와 혈청 마이오 글로빈, 나이, 부갑상선호르몬, Kt/V_urea 등과 유의한 상관관계를 보였다(r=0.46, p=0.0003; r=0.29, p=0.0282; r=0.42, p=0.0014; r=-0.49, p=0.0001; r=-0.29, p=0.0282). 그러나 cTnI는 나이만이 유의한 상관관계를 보였고(r=0.47, p=0.0003) 나머지 심근손상지표와 Kt/Vurea 등의 지표는 cTnI와 상관관계가 없었다. 결 론 : 유지혈액투석 중인 말기신부전 환자에서 심근손상의 지표로서 cTnT에 대한 2세대 ECLIA는 cTnI보다 더 민감하고 특이도는 cTnI 만큼 높으며, 부갑상선호르몬, 투석적절도, 여타 심근손상지표 등이 심장트로포닌-T 양성군 및 심근허혈군에서 유의한 차이를 보여, 장기혈액 투석환자에서 cTnT를 측정함으로써 경미한 허혈성심질환의 발견과 추적에 도움이 될 것으로 생각된다. Background : The main cause of death in maintenance hemodialyzed patients is cardiovascular event. Serum cardiac troponin T(cTnT) and I(cTnI) are increased in the serum of patients with chronic renal failure. Methods : We studied the incidence of increased serum cTnT and cTnI, the differences of their positivity, and the myocardial injury and cardiovascular risk factors in 56 maintenance hemodialyzed patients (30 males, 26 females). We investigated the patients about smoking, diabetes, hypertension and anginal pain. Blood was obtained from the patients immediately before hemodialysis. Samples were analyzed bin, PTH, cTnT and cTnI. Also, we evaluated the duration and adequacy(Kt/V_urea) of dialysis and ECG. cTnT was measured by ECLIA(reference value ≤0.1 ng/mL) and cTnI, by OPUS(reference value ≤0.5 ng/mL). Results : The mean age was 47 years(range from 15 to 73) and the mean dialysis duration was 38.7 months(range from 2 to 156). Myocardial ischemia was observed in 57.1%(32/56) of the patients. cTnT level above 0.1 ng/mL and cTnI level above 0.5 ng/ mL was observed in 32%(18/56) and 14%(8/56) of patients respectively. cTnT revealed significantly higher positive rate in the patients with myocardial ischemia than the patients without myocardial ischemia(37.5% vs 4.2%)(p=0.001). cTnI revealed no difference in positive rate between the patients with and without myocardial ischemia(18.8% vs 8.3%). The sensitivity and specificity of cTnT to myocardial ischemia were higher than those of cTnI(sensitivity 37.5% vs 18.8%, specificity 95.8% vs 91.6%). The patients with myocardial ischemia revealed hypertension, age over 40, Kt/Vurea under 1.4, and increased LDH, CPK, myoglobin, PTH levels with significantly higher frequency comparing to the patients without myocardial ischemia(p<0.05). cTnT levels correlated to LDH, myoglobin, age, PTH levels and Kt/Vurea(r=0.46, p=0.0003; r=0.29, p=0.0282; r=0.42, p=0.0014; r=-0.49, p=0.0001; r=-0.29, p=0.0282). cTnI levels correlated to age(r=0.47, p=0.0003) only. Conclusion : cTnT is a more sensitive and equally specific marker of myocardial ischemia than cTnI in patients undergoing maintenance hemodialysis. Also we may suggest that myocardial injury and increased cTnT levels are related to inadequate dialysis, secondary hyperparathyroidism and other cardiovascular risk factors in maintenance hemodialyzed patients.