중성자에 조사된 원자로 압력용기 재료의 Barkhausen 노이즈에 관한 연구

옥치일,김장환,박덕근,홍준화,이종규 韓國非破壞檢査學會 1998 한국비파괴검사학회지 Vol.18 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 자기이력곡선과 Barkhausen noise amplitude(BNA), Barkhausen noise energy(BNE) 및 미세경도 변화를 측정하여 이들 사이의 상관관계를 구하였다. 중성자 조사에 의하여 자기이력곡선은 변화가 없었으며, BNA, BNE 및 경도는 중성자 조사량에 따라 세 단계의 변화를 보였으며, 중성자 조사량이 10 n/㎠에서는 급격히 변하여 이들 사이의 상관관계가 있음을 알 수 있었다. 따라서 BNA와 BNE가 중성자 조사에 의한 재료의 미세 구조 결함을 조사하는데 비파괴적인 방법으로 가능성이 있음을 알 수 있었다. Hysteresis loop, Barkhausen noise(BN), and hardness were measured in the neutron irradiated RPV steel for various fluence, irradiated dose up to 10 n/㎠. The coercivity, remanence and maximum induction of neutron irradiated samples did not change significantly, but the BNA and BNE were decreased as the neutron irradiation increased. The changes of BNE and BNA were characterized by three stages with respect to neutron dose. The BNA and BNE were decreased with an increase of neutron dose to 10 n/㎠, and remained nearly constant up to 10 n/㎠, then were decreased rapidly with an increase of the neutron dose above 10 n/㎠. On the other hand, the hardness was observed revesely with the change of BNA and BNE.

超多收性 대립벼의 窒素施肥量이 生育特性과 收量에 미치는 影響

李宗玉,金鎭雨,崔周鎬,金長鏞 진주산업대학교 농업기술연구소 1997 農業技術硏究所報 Vol.10 No.-

本 硏究는 晋州産業大學校 學生實習圃場에서 1996年 4月부터 同年 10月까지 다산벼(da san)벼를 公試 品種으로 하여 施肥水準을 窒素 0, 10, 15, 20, 25kg으로 달리 栽培하여 各 施肥水準에 따라 生育 및 收量, 米質을 調査한바 그 結果를 要約하면 다음과 같다. 1. 分蘗數는 施肥水準이 높을수록 많았으며, 有效莖比率은 낮은 경향이었다 2. 稈長 및 穗長은 施肥水準이 높을수록 길었으며,穗數는 큰 차이가 없었다. 3. 千粒重은 施肥水準이 높을수록 무거웠으며, 登熟 및 精玄比率은 낮은 경향이었다. 4. 粒數는 施肥水準 無肥區보다 25kg區에서 30個 程度 많았다. 5. 比重 및 層米重은 施肥水準이 높을수록 많은 경향이었다. 6. 正組重은 無肥歐에 비하여 25kg歐에서 278kg, 玄米重은 190kg程度 많았다. 7. 各 形質의 有意性 檢定 結果는 反復間에는 差異가 없었으며 處理間에는 全 形質에서 認定되었다. 8. T-N含量은 施肥量이 增加함에 따라 增加하였다. 9. P_2O_5, CaO, MgO는 處理間에 差異가 없었다. 10. K_2O는 10kg區, SiO_2는 25kg區에서 가장 높았다. This Paper aims to examine the effects of different level nitrogen fertilization on the growth, yield and quality of the dasam rice. The nitrogen levels were 0, 10, 15, 20 and 25kg per plot. The experiment were carried out in Chinju National University Experimental Farm from April till October, 1996. The results are as follows : 1. The tiller numbers became larger in the higher notrogen level plots. But as the nitrogen level got higher, the percentage of effective tillers decreased. 2. The culm and panicle legth became longer in the higher level ; the number of panicles per plant showed little difference. 3. The 1,000 grain weight became heavier in the higher level ; but the ripeness percentage and the hulled and unhulled rice percentage became lower. 4. The grain number of the 25kg plot was larger by 30 than that of the 0kg plot. 5. The empty grains and rice screenings increased in the higher levels. 6. The winnowed rice in the 25kg plot was heavier by 278kg than in the 0kg plot ; the brown rice was heavier by 190kg. 7. The significance test revealed the each replication showed no difference in each character, but that each treatment showed significant difference in all the characters. 8. The T-N content increased in the higher levels. 9. P_2O_5, CaO and MgO showed no difference in each treatment. 10. K_2O content was highest in the 10kg level ; SiO_2 in the 25kg level.

바이오필터에 의한 VOCs의 제거에 대한 연구

김장호,김옥택,안종수,김종수 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1

Biofiltration was successfully applied to treat amixture of volatile organic compounds(Benzene, Xylene) from contaminated air stream. Immobilized Ps.oleovorans biofilter was evaluated for its value in simultaneous removal of B.X from waste air stream. The variety of operating conditions were tested to evaluated important factors such as space velocity, PH, water content, ect. In the loading rate(1,000ppmv) and space velocity(l,200hr), the average removal efficiencies of B.X. were 39.3% and 30.5% and CO₂ production rate were 6.72 mg/hr, 4.65mg/hr, respectively. Removal efficiency of B.X. mixture was lower than it's each individual at same loading rate. When the concentrations of B.X. mixture were controlled 300ppmv and 900ppmv at two stages reactor, the average outlet concentration were 7.lppmv, 184.5ppmv and CO₂ production rate were 6.04mg/hr, 12.6mg/hr, respectively.

관동맥 우회로 이식술후 우회 혈관의 개존 여부 평가에 있어 전자선 단층 촬영을 이용한 3차원 혈관조영술의 유용성

하종원,조승연,심원흠,정남식,이향미,최규옥,장양수,유경종,강면식 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.5

Halimeter를 이용한 치면세마처치 전후의 구취감소효과에 관한 연구

이은숙 ; 장종화 ; 최옥선 김천대학교 2000 김천대학교 논문집 Vol.21 No.-

The purpose of this study was attempted to analyze the halitosis concentration variation before and after oral prophylaxis through the oral examination and questionaires method as well as measuring the halitosis by Halimeter for volatile sulfer compounds, For this study. 50 patients were selected samples who had visited division of dental infirmary of Eulgy University Hospital from March 27. 2000 to June 8, 2000. The obstained results were as follows: 1. The average value for halitosis by Halimeter was 154.93±42.86ppb in men and 133.42±52.82ppb in women and average 144.18±42.83ppb(p=0.120). The value was approved increasing by age(p=0.137). 2. On toothbrushing bounds. When brushing teeth, gingiva, tongue, the halitosis concentration is lower than brushing only teeth and gingiva(p=0.001). 3. According to toothbrushing reason. Just for prevention of oral disease showed lower halitosis concentration than just for habits or halitosis removing case(p=0.000). 4. According to the toothbrushing bounds, After oral prophylaxis halitosis concentration is lower than before oral prophylaxis(p=0.000). 5. Before oral prophylaxis concentration is lower than after oral prophylaxis by ages and sex group(p=0.000)

기관지 방선균증의 임상 1례

이은영,장태원,정만홍,옥철호,이규원,손창배,이지숙,신은경,서정아,백종현,김영옥 고신대학교의과대학 2007 고신대학교 의과대학 학술지 Vol.22 No.2

Actinomycosis is a chronic suppurative infection, whitch infiltrates mucosa-associated tissues. Thoracic, pelvic and cervicofacial infections of actinomyces are not uncommon, but endobronchial actinomycosis is rarely reported. We report a case of a 29 year old man who presented with a recurrent pneumonia and chronic cough. Fiberoptic bronchoscopy revealed occlusion of the right. lower medio-basal segment bronchus with exophytic endobronchial mass. The diagnosis was confirmed histologically by demonstration of sulfur granules in the bronchoscopic biopsy of the mass. Intravenous administration of amoxacillin and clindamycin followed by oral amoxacillin and clindamycin therapy resulted in complete recovery.

패류중 중금속함량에 관한 연구

신현수,허옥순,이진하,김세은,주인선,신동우,강석종,박만종,김지연,김근희,강숙경,정래석,허숙진,소유섭,최장덕,문병우,김진수 식품의약품안전청 2001 식품의약품안전청 연보 Vol.5 No.-

본 연구는 패류중 중금속함량 측정을 위한 분석효율이 높고 간편한 분해법을 찾아내어 그 방법에 의끓 유종중인 패류중 중금속함량을 파악하고자 수행하였다. 시료를 분해시키는 Microwave와 습식, 건식회법을 비교한 결과 변형습식회화르가 가장 적합하였다. 변형습식회차딘는 려린0,3+C104+H2SOf의 혼찰산을 쪼 · j 1 (v/v)의 비율로 혼합하여 사용하였 을 때 회수을 Pb린틴. Cd 97.8, Cu 94.2, Zn 92.8%를 나타내었근 분해시간은 2~2.5시간 소요되었다. 유통중인 패류중 중금속함량 」최소~최대(평균), mgAgl 은 Pb 0.028~o.528(0.153), Cd 0.OO7~1,832(0.587), Cu 0.360~37.375(4.6691, Zn 6.317~233.2iO(38.881), Hg 0.001 ~O.151(0.012)mg/ltg으로 나타났다. 또한 유통중인 5종의 패류중 중금속평균항량이 생산지 하재지역에서 구입한 패류에 비해 모든 중금속언써 약간 높은 함량을 보였으나 오염된 수준이 아닌 자연함유량수준이었다. This study was conducted to improve the digestion method for the determination of heavy metals in shellfishes and to estimate the contents of heavy metal in commercial shellfishes by their digestion method. This digestion method was compared microwave with wet and dry ash digestion for shellfish samples, obtained results showed that the modified wet ash Ⅱ digestion was convenient and easy to use. For the modified wet ash Ⅱ digestion, The mixed acid of HNO₃+HClO₄+H₂SO₄(25:5:1, v/v) was used. Under this condition, Recoveries were Pb 94.3, Cd 97.8, Cu 94.2 and Zn 92.8% and digestion time was ∼2.5 hours. The contents of heavy metal [minimum∼maximum (mean), mg/kg in commercial shellfishes were as follows ; Pb:0.028∼0.528(0.153), Cd:0.007∼1.832(0.587), Cu:0.360∼37.375(4.669), Zn:6.317∼233.250(38.881), Hg:0.001∼0.151(0.013). The contents of heavy metal in commercial shellfishes of five species were slightly greater than those of shellfishes purchased at Hajae. There was no great difference between the contents of heavy metal of Hajae and those of shellfishes purchased at Whole market.

선천성 양측성 폐정맥 협착증의 심초음파 및 심도자 및 혈관조영술 소견

정남식,하종원,윤정한,김병옥,장양수,조승연,조범구 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.4

중성자에 조사된 원자로 압력용기 재료(SA508)의 Magneto-acoustic emission 효과

홍준화,박덕근,옥치일,김장환,이종규 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.6

원자로 압력용기 재료인 SA508 steel을 온도 70 ℃와 대기압하에서 최고 10 n/㎠까지 중성자를 조사시켜 조사량에 따른 미세경도 변화와 magneto-acoustic emission(MAE) 에너지를 측정하였다. 중성자 조사에 따른 경도의 변화는 조사량이 10 /㎠까지는 거의 일정하였으나, 조사량이 10 /㎠이상에서 급격히 증가하였다. MAE 에너지의 변화는 중성자 조사량에 따라 경도의 변화와 같은 형태로 변하였으나 그 변화량은 감소하여 그변화의 추이는 경도의 변화와는 역의 형태였고, 또한 MAE에너지의 상대적 변화와 경도 변화사이에는 아주 좋은 선형성을 보였다. 이러한 결과에서 SA508 강재는 10 /㎠이상의 중성자에 조사될 경우에 재료에 중성자 조사에 의한 미세 결함이 급격히 증가하여 전위(dislocation)이동에 대한 저항성을 나타내는 마찰경화의 증가가 경도의 증가를 유발하고, 또한 이러한 미세 결함은 자기장과의 반응에서는 90°자벽의 운동중에 자기탄성 변화를 유도하여 MAE 에너지의 감소를 유발함을 알 수 있었다. 그리고 경도의 변화량보다 MAE 에너지의 변화량이 더 크게 나타나, 중성자 조사에 의한 미세결함은 기계적 성질보다 자기적 성질에 더 민감하게 반응한다는 것을 알 수 있었다.따라서 MAE가 중성자 조사에 의한 재료의 미세 구조 결함을 비파괴적인 방법으로 평가하는 강력한 도구의 가능성이 있음을 알 수 있었다. Magneto-acoustic emission (MAE) energy and hardness were measured in the reactor pressure vessel steel (SA508 Steel) for the various neutron fluence, irradiated dose up to 10 n/㎠. The hardness was nearly a constant up to 10 n/㎠, but it was rapidly increased with an increase of the neutron irradiation above 10 n/㎠. It may be considered that the increase of hardness is due to the hindrance of dislocation motion induced defect clusters by irradiation. On the other hand, the MAE energy was slowly decreased as the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation increased up to 10 n/㎠ and it was rapidly decreased with an increase of the neutron irradiation above 10 n/㎠. The decrease of the MAE energy may be considered as an increase of the defect clusters which is very sensitive to the 90°domain wall motion. Furthermore, the change of MAe energy and hardness had nearly a linear relationship, but the change of MAE energy was more significant than the change of the hardness. Therefore, MAe may be considered as a very useful technique for the nondestructive evaluation of irradiation damage.

S-상 심실중격의 임상적 고찰

이동민,장경식,양종태,장대용,김종오,서영욱,고영엽,홍순표 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

Background: The sigmoid septum described an anatomical variation in the contour of the left ventricular outlet. It is related to degenerative change with aging. We observed clinical significance of sigmoid septum in Korean. Methods: Echocardiographic examination was performed in 434 patients. Sigmoid septum is defined as discrete bulging of the proximal interventricular septum with that thickness is greater than 1.3cm or the thickness is grater 1.5 times than adjacent mid interventricular septum in apical 3 chamber view. Result: The incidence of patient with sigmoid septum(septum patient) is 24.8% (male 8.4%, female 16.3%) . The incidence increases with age and is more common in women. The patients with sigmoid septum were compared with targeted groups, there was no significant difference in blood pressure between them, but in height and weight, the former were lower. (p<001, p<03). In the patients with sigmoid septum, weight and the surface area of a body have an opposite correlation with increase of age (p<03, r=-0.34) (p<04, r=-0.31) , but no decrease of height was found according to age increase (p=0.47, r=-0.11) The main reason patients with sigmoid septum ask echocardiolography and its clinical symptoms were abnormal results of previous electrocardiography and/or usual chest pain. Compared with control group, interventricular septal thickness is larger in septum patients (p<001). The thickness of interventricular septum located in subaortic left ventricular outflow tract is 1.6±0.3cm. There is another web like structure that continued from interventricualr septum to anterior free wall of left ventricle and the width is 1.6±0.4cm. A sign of insignificant obstruction due to left ventricular outflow was observed from three sigmoid septum patients. Conculusion: Septum patient is largely found in older age group and the body weight and body surface area are lower than control group. The body weight and body surface area are opposite correlation with age. So sigmoid septum is considered as structural change by weight reduction with aging. It is assumed that septum patients are related with asymptomatic ischemia because they have more abnormal ECG finding such as T wave inversion on precordial leads or standard leads, nonspecific ST-T change, LBBB etc. Sigmoid septum is not only proximal interventricular septal bludging but also another web like structure continuing to anterior wall of left ventricle.