${\pi}$형 거더를 가진 4경간 사장교의 동적거동에 관한 실험적 연구

조재영,김영민,이학은,윤기용,Cho, Jae-Young,Kim, Young-Min,Lee, Hak-Eun,Yoon, Ki-Yong 한국방재학회 2004 한국방재학회논문집 Vol.4 No.1

Generally, a ${\pi}$-type girder composed of two I-type girders is known to have a significant disadvantage in wind resistance design because of aerodynamic instability. A representative bridge for this girder was Tacoma Narrows Bridge. Since Tacoma Narrows Bridge had very low stiffness of the bridge structure and its cross-section shape had aerodynamic instability, the bridge collapsed after severe torsion and vibration events in 19m/s wind speed. Aerodynamic vibration can be avoided by enhancing structural stiffness and damping factor and conducting a study of cross-section shapes. This study shows the angle of attack for the four-span cable stayed bridge having ${\pi}$-type cross-section and describes the aerodynamic characteristics of the changed cross-section with aerodynamic vibration damping additions, by carrying out two-dimension vibration tests. As a result of uniform flow and turbulent flow, the study shows that because the basic ${\pi}$-type cross-section alone can have efficient wind resistant stability, there is no need to have additional aerodynamic damping equipment. Since this four 230m-main-span bridge has a large frequency and also has a big stiffness compared to other bridges containing a similar cross-section, it has aerodynamic stability under the design wind speed. 일반적으로, 2개의 I형 거더로 이루어진 ${\pi}$형거더는 공기역학적으로 불안하여 내풍설계에 있어 매우 불리 한 것으로 알려져 있다. 공기역학적 진동은 구조물의 강성이나 감쇠의 향상, 단면 형상의 연구 등에 의해 억제될 수 있으므로 본 연구에서는 ${\pi}$ 형단면을 가진 4경간 사장교에 대해 영각과 공기역학적 제진장치의 추가로 인한 단면의 변화에 따른 2차원 진동실험을 통하여 공기역학적 특성을 파악하도록 하였다. 등류와 난류에서의 실험결과 본 교량단면은 기본단면만으로도 내풍안정성을 충분히 갖추고 있기 때문에 페어링(Fairing) 및 베플(Baffle Plate) 등의 추가적인 공기역학적 제진장치가 필요하지 않을 것으로 판단된다. 이는 본 교량의 경우 주경간이 230m인 4경간으로 이루어져 있어 비슷한 단면을 가진 교량에 비하여 수직 및 비틀림 진동수가 크고 강성이 크기 때문에 설계풍속 내에서 공기역학적으로 안정한 것으로 보여진다.

각종재배조건이 고구마 수량 및 전분 함량에 미치는 영향

조재영,박근용,반채돈,Jae-Young Cho,Keun-Yong Park,Chae-Don Ban 한국작물학회 1970 한국작물학회지 Vol.- No.8

각종 재배조건 및 저장기간이 고구마 전분함량에 미치는 영향을 구명코저 신미 품종을 공시하여 삽식기별 수수기별 시비량별 토성별 저장기간별로 구분 시험을 실시하였든바 요약하면 다음과 같다. 1. 5월 15일 삽식에 비하여 만식일수록 괴근수량 및 전분함랴은 감소되었고 특히 6월 5일 이후의 삽식에서 급격히 감소되었으며 괴근수량의 감소정도에 비하여 전분함량의 감소정도는 더욱 심하였다. 2. 10월 5일 적기수확에 비하여 조기수확일수록 괴근수량 및 전분함량은 감소 경향이였고 8월 25일 이전 조기수확은 괴근수량 37~45% 전분함량 5~7%의 감소를 보였다. 3. 시비량에 따라서 전분함량은 차이가 많았으며 대체로 3요소를 균형시비하는 경우 전분함량이 높은 경향이었고 가리질비료를 다용하거나 인산질비료를 시용하지 않은 경우 낮은 경향이였다. 한편 괴근수량에는 $K_20$O>$P_20_5$>N의 순으로 효과가 높았다. 4. 토성에 있어서는 모래나 자갈이 많이 함유되어 있는 토양에서부터 경직토로 갈수록 전분함량은 낮았으나 10a당 전분수량은 조사토 및 식양토에서 높았다. 5. 저장기간중 전분함량은 수량직후에 가장 높고 저장일수가 경과함에 따라 감소하였으나 수확후 10일에서 급격히 감소되었고 그 후의 감소는 근소하였다. Investigation was made to know the effects of the time of transplanting and harvesting, fertilizer, soil texture and period of storage on tuber yield and starch content of sweet potato. Variety used was Shin-mi, one or the leading varieties in Korea. Late transplanting, early harvesting, and balanced application of nitrogen, phosphorous and potassium, and loam and coarse sandy loam were more effective in increasing starch content than early planting, late harvesting, and more application of potassium and none application of phosphorous, and light clay respectively. Long storage period resulted in reducing starch content.

영농기 필지논의 근역 영양물질 농도 변화 및 침투손실량

윤광식,조재영,최진규,손재권,한국현,김영주,최진용,Yoon Kwang-Sik,Cho Jae-Young,Choi Jin-Kyu,Son Jae-Gwon,Han Kuk-Heon,Kim Young-Joo,Choi Jin-Yong 한국관개배수위원회 2002 한국관개배수논문집 Vol.9 No.1

Changes of concentrations and losses of nutrient via infiltration from paddy plot during rice cultivation were monitored. The infiltrated water samples were collected in a ceramic porous cup which was buried at the depth of 30,50,70, and 90cm beneath the

ST분절 상승 심근경색증 환자에서 증상 발생 후 응급센터 도착 시간 지연에 영향을 주는 요인

이재훈 ( Jae Hoon Lee ),정명호 ( Myung Ho Jeong ),이정애 ( Jung Ae Rhee ),최진수 ( Jin Su Choi ),박인혜 ( In Hyae Park ),채임순 ( Leem Soon Chai ),장수영 ( Soo Yong Jang ),조재영 ( Jae Young Cho ),정해창 ( Hae Chang Jeong ),이기홍 대한내과학회 2014 대한내과학회지 Vol.87 No.4

Background/Aims: Delay in symptom-to-door time (SDT) in patients with acute ST-segment elevation myocardial infarction (STEMI) is the most important factor in the prediction of short and long-term mortality. The purpose of this study was to investigate the social and clinical factors affecting SDT in patients with STEMI. Methods: We analyzed 784 patients (61.0 ± 13.2 years, 603 male) diagnosed with STEMI from November 2005 to February 2012. The patients were divided into four groups according to SDT: Group I (n = 163, ≤ 1 h), Group II (n = 183, 1-2 h), Group III (n = 142, 2-3 h) and Group IV (n = 296, > 3 h). Results: Delay in SDT increased with age (Group I, 58.4 ± 12.0; Group II, 59.4 ± 13.3; Group III, 62.0 ± 12.8; Group IV, 63.0 ± 13.8 years, p = 0.001). In 119 patients, transportation was less frequently used as the delay in SDT (41.7% vs. 29.0% vs. 26.1% vs. 9.8%, p < 0.001). By multiple logistic regression analysis, family history [OR, 0.488; CI, 0.248-0.959; p = 0.037], previous ischemic heart disease [OR, 0.572; CI, 0.331-0.989; p = 0.045], no occupation [OR, 1.600; CI, 1.076-2.380; p = 0.020] and method of transportation [OR, 0.353; CI, 0.239-0.520; p < 0.001] were independent predictors of delay in SDT. Conclusions: Our study shows that general education about cardiovascular symptoms and a prompt emergency call could be important to reduce SDT in STEMI. (Korean J Med 2014;87:429-438)

AWS자료를 이용한 새만금간척지의 기상분석

송재도 ( Song Jae-do ),손재권 ( Son Jae-kwon ),구자웅 ( Koo Ja-woong ),최진규 ( Choi Jin-kyu ),조재영 ( Cho Jae-yong ),김영주 ( Kim Young-ju ) 한국농공학회 2007 한국농공학회 학술대회초록집 Vol.2007 No.-

It is important to be analyze the relationship between agricultural land planning and weather in the Saemangeum reclaimed tideland. So, this study was analyzed weather characteristics of Saemangeum reclaimed tideland until December, 2006 since January, 2001 using the AWS observation weather data. Analysis items of weather data were air temperature, wind speed, precipitation. In case of air temperature was ascending gradually, and was ranged 12.7~14.0℃ during the recently 6 year. Island and inland region was showed high, but showed comparatively low in region that was adjoined in west coast. Also, wind speed, annual precipitation were ranged 1.4~3.5m/s, 1,064.5~1,367.1mm by regional.

미시적 조성분급과 상전이

이재훈,김용완,조재영,최청송 ( Jae Hoon Lee,Yong Wan Kim,Jae Young Cho,Cheong Song Choi ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

논에서의 일주기 수질 조사로부터 유도된 오염물질의 강우 -유출 사상별 유량가중평균농도와 유출량- 유하부하량 관계

윤광식 ( Yoon Kwang Sik ),최진용 ( Choi Jin-yong ),한국헌 ( Han Kuk Heon ),조재영 ( Cho Jae Young ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.5

Water quality samples were taken for every two hours whenever runoff occurred by rainfall to investigate concentration variations of T-N, T-P and SS during runoff process from a paddy field. The difference between the highest concentration in a runoff event and flow weighted mean concentration for T-N, T-P, SS placed between 3.07∼40.16%, 11.44∼60.80%, and 15.11∼64.5%, respectively. The difference between the lowest concentration in event and event mean concentration for T-N, T-P, SS ranged between -7.24∼-31.84%, -11.59∼-47.86%, and -5.21∼-36.20%, respectively. The relationship between runoff and mass load was derived for each storm event using observed data. The relationship between runoff and mass load showed linear relationship regardless of water quality constituents and rainfall amount. The results suggested that relationship between T-N and T-P loads and runoff should be prepared separately in considering of fertilization effect and seasonal conditions. The relationship between SS and runoff should be made to reflect seasonal conditions and tillage effect.

低溫과 水分포텐셜이 紫雲英 蒐集種의 發芽와 苗伸長에 미치는 影響

Rak Chun Seong(成樂春),Keun Yong Park(朴根龍),Jae Yeung Cho(趙載英) 한국육종학회 1990 한국육종학회지 Vol.22 No.3

Germination and seedling growth of local collected chinese milkvetch (Astragalus sinicus L.) cultivars were measured at three temperatures (5, 10 and 15℃) and four polyethylene glycol(PEG) 10,000(MW) solutions(0, 10, 20 and 25g/100㎖ H₂O). Adjustments of PEG 10,000 solutions were based on water potentials of 0.0, -0.2, -0.5 and -0.8 MPa at room temperature. Observations were taken at 5, 7, 9 and 11 days for treatments at 15℃, 7, 11, 15 and 19 days for those at 10℃, and 9, 15, 21 and 27 days at 5℃. Germination rate of cultivar A of chinese milkvetch was higher than that of cultivars B at three temperatures and four PEG treatments. However, cultivar B showed greater seedling length than cultivar A at the temperatures and PEG treatments. The highest germination rate and seedling length of both cultivars were appeared at temperature of 10℃ among three temperatures. Germination rate and seedling length of both cultivars were reduced as PEG concentration increased from PEG 10 to 25g/100㎖ water. With concentration of PEG 20 and 25g/100㎖ water, germination rate and seedling length of both cultivars were the highest at 101C. Germination rate and seedling length of both cultivars of the cultivars was increased as temperature increased. The result of this study indicated that germination of chinese milkvetch seeds was affected more by moisture stress conditions than by low temperatures and required more moisture for adequate germination and seedling growth.

급성 ST분절 비상승 환자의 1년 사망률 예측을 위한 새로운 위험 도구

박진희 ( Jin Hee Park ),박인혜 ( In Hyae Park ),정명호 ( Myung Ho Jeong ),이숙자 ( Sook Ja Lee ),장수영 ( Soo Yong Jang ),조재영 ( Jae Young Cho ),정해창 ( Hae Chang Jeong ),이기홍 ( Ki Hong Lee ),박근호 ( Keun Ho Park ),심두선 ( 대한내과학회 2015 대한내과학회지 Vol.88 No.2

Background/Aims: Accurate risk stratification is important in the management of patients with acute myocardial infarction (AMI). This study aimed to develop a new assessment tool for the prediction of 1-year mortality in patients with AMI, including biochemical markers. The author developed a new assessment tool (new risk score) that takes biochemical markers into account for 1-year mortality in patients with non-ST elevation myocardial infarction (NSTEMI) and identifies the risk factors related to 1-year mortality. Methods: A total of 1,427 patients (65 ± 11.8 years of age, 985 males) who were admitted to the Chonnam National University Hospital with NSTEMI from November 2005 to March 2012 were retrospectively analyzed for score derivation. Multivariable Cox-regression analysis was used to select correlates of 1-year mortality that were subsequently weighted and integrated into an integer scoring system.Results: Seven variables selected from the initial multivariate model were weighted proportionally to their respective hazard ratiofor 1-year mortality; age ≥ 65 years (2 points), N-terminal pro-brain natriuretic peptide (NT pro-BNP) > 991 pg/mL (1 point), baseline left ventricular ejection fraction < 40% (1 point), high sensitivity C-reactive protein (hs-CRP) > 3 mg/dL (1 point), glomerular filtration rate (GFR) < 60 mL/min/1.73 m2 (1 point), heart rate > 82 beats/min (2 points), and final thrombolysis In myocardial infarction flow < 3 (2 points). Conclusions: In NSTEMI patients, our new score that incorporates seven risk factors accurately predicts the 1-year mortality. Additionally, the biochemical markers hs-CRP, NT pro-BNP, and GFR are reliable predictors of 1-year mortality. (Korean J Med 2015;88:168-176)

슬관절내 발생한 Clear Cell Sarcoma - 1예 보고 -

김성수,조재영,김용식,김정만 대한슬관절학회 1991 대한슬관절학회지 Vol.3 No.1

Clear cell sarcoma arising from tendons and aponeuroses is very rare, especially in the knee joint. This was firstly decribed as a new type of tumor by Enzinger in 1965. Although the histogenesis of clear cell sarcoma remains uncertain, it may be expected the melanocytic origin. The microscopic pattern of nests, fascicles, or clusters of fusiform to polygonal cells with a typical reticular pattern, clear cytoplasm, and clear nucleoi with prominent nucleoli is a consistent observation. We report a case of incidentally founded clear cell sarcoma in the knee joint mimic to chronic synovitis with review of literature.