밤나무의 내한성(耐寒性)(제1보(第一報)) - 품종별(品種別) 부위별(部位別) 차이(差異)에 관(關)하여 -

조태환,홍성각,Cho, Tae Hwan,Hong, Sung Gak 한국산림과학회 1975 한국산림과학회지 Vol.26 No.1

경기도(京畿道) 내(內) 4지역에서 1975년 3월 2일에 채취된 밤나무 10 품종(品種)에 대한 내한성도(耐寒性度)의 품종 및 부위별(部位別) 차이를 알기 위해 본 실험을 하였다. 저온(低溫) 및 해영온도(解永溫度) 처리(處理) 속도(速度)를 자연상태와 비슷한 시간당(時間當) $6^{\circ}C$ 보다 더 천천히 조절하였다. 부위별(部位別) 내한성도(耐寒性度)의 순위는 모든 품종에 있어서 동아(冬芽), 형성층(形成層), 재부유조직(材部柔組織) 및 피층(皮層)의 순위(順位)로 증가 하였다. 품종 간(間)의 내한성도의 순위는 줄기의 부위에 따라 일정치 않았으나 품종단택(品種丹澤)(단지와)은 예외적으로 모든 부위(部位)에 있어서 가장 높은 내한성도를 보였다. 가장 내한성도가 높은 품종을 발견하는데 있어서 부위별 내한성도의 계절적 변화(變化)에 관한 연구의 필요성에 관하여 고찰되었다. Freezing resistance of ten cultivars of Chestnut (Castanea crenata S. et Z.) collected from four different sites of Kyunggi Province, Korea on March 2, 1975, was measured to find out the differences among tissue parts, and those among cultivars. The freezing and thawing rates were controlled lower than $6^{\circ}C/hr$. which occurs in nature. The resistance to low temperature was in order from lowest to highest; winter bud, cambium, xylum ray parenchyma and bark cortex. The difference in cold hardiness among cultivars was not consistent among tissue parts of twig stem except in cultivar Dan-Taeck of which all tissue parts showed highest cold-hardiness. The importance of the study on the seasonal variation in cold hardiness of different tissue parts was discussed in terms of choosing the most cold resistant Chestnut culitivar in Korea.

액상의 혼합성이 한정된 계의 기액평형의 열역학적 건전성평가에 관한 연구

조태환 단국대학교 1985 論文集 Vol.19 No.-

21세기의 미공군

조태환,Jo, Tae-Hwan 한국방위산업진흥회 1987 國防과 技術 Vol.- No.98

사이드펄링을 활용한 과풍속제어장치에 대한 풍동시험 연구

조태환,김양원,장일영,박철완,김정환 한국풍력에너지학회 2017 풍력에너지저널 Vol.8 No.2

A wind tunnel test for the side-furling device that was used for a horizontal type small wind turbine to reducethe output power in a high wind speed condition was conducted in a 5 m × 3.75 m open-jet test section. Asimple experimental wind turbine model with a “MEXICO blade” and electric motor was used to simulate thesmall wind turbine system. The furling force of the tail was measured by a force sensor installed on the furlingarm and the yawing moment of the turbine was measured by a moment sensor installed on the turbine strut. The turbine power was calculated by using the torque of the rotating axis and the rotational speed of the blade. Force characteristics of the tail system were studied by changing the arm length, wind speed and flow direction. Moment characteristics of the nacelle and blade system were studied by changing the offset distance, wind speedand RPM. Moment equilibrium conditions for the typical wind speed were estimated from those test results andconfirmed by a fixed-tail-angle test. A free-tail-angle test was also conducted to verify the effect of theside-furling device in high wind speed conditions.

간이보정장치를 이용한 외장형 풍동저울 보정상수 및 풍동저울 축 보정

조태환,정진덕,최인호,성봉주,서종원 한국항공우주학회 2000 한국항공우주학회 학술발표회 논문집 Vol.- No.-

블레이드 축소모델 풍동시험을 통한 MW급 풍력발전기 성능예측 연구

조태환,김양원,황은수 한국풍력에너지학회 2016 풍력에너지저널 Vol.7 No.1

The aerodynamic performance of the MW size wind turbine was studied by the wind tunnel test with scaled down model. The radius of the real scale blade was about 56 m and the corresponding Reynolds number at the blade tip was 3.6×106. The scaled down model used in wind tunnel test has a 1.1 m radius and the maximum Reynolds number achievable in the wind tunnel test was 0.1×106. The aerodynamic characteristics of the scaled down model by the Reynolds number was studied experimental method and computational method. The Reynolds number effect on the aerodynamic performance of the blade from 0.8×106 to 1.1×106 was tested by changing the rotational speed of the blade from 700 RPM to 900 RPM. The test results show that the power coefficient at 700 RPM was quite low and collapsed by comparison with the results at 800 RPM and 900 RPM. The wake measurement results show that there was a stall in the middle sections of the blade and this made the Cp collapse. The BEMT analysis for the scaled down model and real scale model were conducted and the correlation equation was induced from those results. The aerodynamic performance of the MW size wind turbine blade was estimated from the wind tunnel test results of the scaled down model with this correlation equation.

응급센터로 내원한 요로감염 환자에게서 균혈증 동반여부를 예측하기 위한 혈청프로칼시토닌 측정의 유용성

조태환,박종수,문성우,최성혁,이성우,홍윤식,김수진,이선정 대한응급의학회 2014 大韓應急醫學會誌 Vol.25 No.6

Purpose: Urinary tract infection (UTI) is a common diseasein the emergency department (ED). In general, UTI couldbe treated easily without complication. However, UTI withbacteremia can progress to sepsis or severe sepsis anddelay of appropriate treatment can result in worse prognosis. Increased serum procalcitonin level in the bacterialinfection of ED patients has been proven. The purpose ofthis study is to examine the clinical utility of procalcitonin asa predictor for bacteremia in UTI patients in the ED setting. Methods: This is a retrospective cohort study. UTI Patientsadmitted through the ED of three academic teaching hospitalsfrom January 2010 to December 2012 were enrolled. We investigated demographic characteristics, hemodynamicvariables, and laboratory results including serum procalcitoninlevel at presentation to the ED according to the presenceof bacteremia. ROC curve was obtained and multivariateregression analysis was performed to test the predictivevalue of serum procalcitonin level for bacteremia inUTI patients. Results: A total of 334 patients were enrolled. Bacteremiawas proven in 135 UTI patients. UTI patients with bacteremiahad significantly higher serum level of procalcitonin(0.830 vs. 6.860, p<0.0001). In multivariable logistic regressionanalysis, level of procalcitonin and platelet countshowed statistical significance (Odds Ratio=1.018, (1.007-1.028), 0.995, (0.992-0.998), 95% CI). Area under thecurve for procalcitonin was 0.729, and cut off value was2.52 ng/ml. Conclusion: Serum procalcitonin level could be used as avaluable predictor for the presence of bacteremia in UTIpatients visiting the ED.

KARI 개방형시험부에서 수행된 고속철도 차량 판토그라프 공력소음 풍동시험

조태환,황은수,김양원,김철완,최영민 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.4

고속철도 차량이 고속주행시 발생하는 소음의 주요소 중 하나로 알려져 있는 판토그라프의 공력소음 특성을 파악하기 위해 실물 판토그라프를 5 m x 3.75 m 개방형시험부에 설치한 후, 소음풍동시험을 수행하였다. 판토그라프 시스템 하부에 설치된 전기 및 기계 장치의 영향을 최소화 하기 위해 하부 덮개를 설치하였으며, 총 81개의 마이크로폰으로 구성된 직경 4m 빔포밍어레이를 사용하여 각 주행조건에서 소음특성을 측정하였다. 단일 마이크로폰 스펙트럼 특성분석을 사용하여 0.5 kHz 이하의 저주파수 대역 소음특성을 비교하였으며, 마이크로폰 어레이 빔포밍기법을 사용하여 0.5 ~ 4 kHz 대역에서 발생되는 소음의 소음원 특성을 비교하였다. 풍동시험은 160km/h 이하 주행속도 조건에서 수행되었으며, 팬헤드의 높이, 측풍 및 정상/비상 운영조건에 대해 수행되었다. Aeroacoustic test for the pantograph system was conducted in KARI low speed wind tunnel with 5 m x 3.75 m open jet test section to study the acoustic characteristics in high speed train. A fairing was installed around the under body of the pantograph to reduce the flow effect by the electric and mechanical components of the pantograph which was covered by the roof fairing in normal high speed train. Spectral power analysis was applied to study the noise characteristics for the frequency ranger under 0.5 kHz and beamforming analysis with 81 microphone array system for the frequency range over 0.5kHz. The test was conducted for various pan head height, normal/emergency operation conditions, side wind conditions at the wind speed under 160 km/h.

문화재 지정 근대 군사유적의 유형별 특징에 관한 연구

조태환,김태영,Cho, Tae-Hwan,Kim, Tai-Young 한국농촌건축학회 2017 농촌건축 : 한국농촌건축학회논문집 Vol.19 No.4

The military remains have a social and historic value in holding up a true mirror to modern history of war and suffering, and will be used for historic place in Korea. This study is to research these modern military remains as cultural properties in Korea. They are classified with three types, namely military sites, installations of civil structures and buildings. The military remains have the historic sites of the righteous army and Korean war, and most of them are battle fields located in a mountainous area rather than urban area. There are fortresses, bridges and tunnels, and watchtowers of civil structures. The fortresses were constructed with Japanese military installations in the end of the Pacific War, and are most located in Sangmo-ri, Daejeong-eup, Seogwipo-si, Jeju-do, Korea. The bridges were to be destroyed and constructed during the war, and the watchtowers as military defence were to be constructed in inland area. There are arsenals, barracks, and headquarters of buildings. The weapon factory of Gigiguk (arsenal bureau) constructed in the late 19th century are present, and also the army training center, barracks, and church, etc are in Seogwipo-si, Jeju-do, Korea. There are old headquarters constructed in 1910s at Jinhae Gyeongnam, and buildings to testify about the horrors of the Korean war around Cheorwon, Gangwon.

성대결절의 초미형태학적 검색

조태환 慶北大學校 醫科大學 1983 慶北醫大誌 Vol.24 No.2

저자는 성대 소결절 5례를 광학 및 전자현미경으로 검색하여 이 질환의 병리학적 발생기전을 규명하고자 관찰하였던 바 아래와 같은 성적을 얻었다. 광학현미경적으로는 간질혈관의 확장 및 내강의 혈전, 혈관기저막의 비후, 및 심한 간질의 부종과 소수의 단핵구 침윤을 볼 수 있었다. 전자현미경으로는 표면의 중층 편평상피세포들간의 부종, 간질의 부종 및 섬유소 침윤, 모세혈관의 확장 및 내피세포들의 비후, 혈관기저막의 섬유소 증식 및 비후, 그리고 혈관을 중심으로한 동심원상의 섬유모세포 증식 등이었다. 이상의 성적들과 문헌적 고찰에 따라 저자들은 성대 소결절의 병리학적기전을 다음과 같이 생각하였다. 발성이라는 기계적 자극이 성대에 가해짐에 따라 혈관내피세포들의 상해 및 손상을 유발하여 혈관의 투과성을 증가시키고 이에 따라 혈장성분이 간질내로 유출됨에 따라 간질의 부중을 유발하여 폴립양의 돌출물이 된다. 이후 역시 누출된 혈장성분들에 의해 섬유모세포들이 자극되어 증식됨에 따라 소결절의 강도 및 크기의 증가를 유발하게 될 것으로 생각된다. Author examined 5 cases of vocal cord nodules, so called singer's nodule, by light microscope and electron microscope, for investigating the pathogenesis. Light microscopically, stromal edema was pathlogic finding. The covering stratified squamous epithelium were relatively intact, and did not show the proliferative change. Along the stroma, many capillaries and venules were proliferated. In the lumen of which congested red blood cells and some thrombi were filled. Basal lamina of capillaries were thickened, which was demonstrated by PAS(Periodic Acid Schiff) stain. Some inflammatory cells, mainly lymphocytes and plasma cells, were aggregated focally. Electron microscopically, covering stratified squamous epithelial cells were quite similar to that of stratum spinosum in the epidermis of skin. But intercellular edema and reduction in the number of spinous processes were noted. Along the stroma, marked edema and fine fibrillary depositions were revealed. The capillaries showed endothelial hypertrophy, and had irregular contoured nucleus and mitochondrial swelling with dilatation of the Golgi apparatus. The lumen of capi llaries was filled with degradation products of red blood cells. The basal lamina of the capillaries were thickened and composed of several layer of laminating collagen fibers. The thickeness of basal lamina was up to 1 um. Along the each capillaries, fibroblasts were proliferated in concentric fashion, so called onin skin appearance. Through the above mentioned results and references of other investigators, we thought pathogenesis of the vocal cord nodules as follows. The main trigger mechanism for developing the nodule would be mechanical irritation of phonation. This stimulation may be induced endothelaial injury and increased permeability of them. The permiated plasma components induced stromal edema, which make polypoid nodules on the surface of the vocal cord commissure. After then, permeated plasma components would stimulated stromal fibroblasts, which were situated normally, and they were proliferated. They would increassed the size and hardness of the nodules. The causes of basal lamina proliferation may be plasma components.