트렌치 굴착에 있어서 경량 흙막이 구조체의 안정성 해석

서성탁,허창환,김희덕,지홍기,Seo , Sung-Tag,Heo , Chang-Han,Kim , Hee-Duck,Jee , Hong-Kee 한국농공학회 2004 한국농공학회논문집 Vol.46 No.2

In trench excavation, essential factor of earth-retaining temporary work structure should be easy taking to pieces and movement, and dead weight must be less. This paper studies about the light weight material and application as earth-retaining structure to prevent the slope failure of sand soil ground caused by the variation of groundwater level in trench excavation. That is, light weight earth-retaining structural is proposed and a simulation with FEM on application of proposed structural in sandy soil is presented. The results are summarized as follows; (1) The study proposed FRP H-shaped pannel for the light weight member, and also presented estimation method about stability. (2) Mechanical property (bending moment, shear force, axial force, displacement) were changed according to groundwater level, but these values had been within enough safety rate and allowable stress. Therefore, proposed light weight pannel with FRP is available for bracing structure in trench excavation.

早期獺에 關한 硏究 : 第1編 病型分類에 關한 硏究 Part1. Studies on the Calssification

徐城鐸 慶北大學校 醫科大學 1964 慶北醫大雜誌 Vol.5 No.1

血尿를 呈하는 全身性疾患

徐城鐸 現代醫學社 1969 現代醫學 Vol.10 No.1

尿路感染症의 細菌學的 免疫學的 硏究

徐城鐸 慶北大學校 醫科大學 1973 慶北醫大誌 Vol.14 No.1

In order to know the causative agents of and the antibody response in urinary tract infections, patients who visited the Urology Clinic of Kyungpook National University Hospital from February through Septemberof 1972 were subjected for the study. Fifty-eight cases of patients studied were calssifiedd as follows; Acute pyelon ehprhitis, 10 cases; chronic pyelonephritis, 21; acute cystitis, 9; chronic cystitis, 11; and urethritis, 7. Among them, 35 were male and 23 were female, and patients of ages from 20 to 40 were most predominant with 39 cases. Chief complains were frank pain (24 cases) and fever and chill (20) among patients of upper urinary tract infections, and dysuria, painful urination and frequency of urination among patients of lower urinary tract infections. The major diseases predisposing infections were urinary stone. Various kinds bacteria were isolated from 32 cases and the maximum colony count of urine was 7.3×10 exp (7) /ml and minimum was 2.3×10 exp (3)/ml, and 27 cases were around 10^5/ml. Escherichia coli was most frequently isolated, and Aerbacter aerogenes, Klebsiellla and Staphylococcus was also foun in significant numbers. E. coli was most frequently associated with pyelonephritis and cystitis, and Klebsiella and A. aerogenes were frequently associated with chronic pyelonephritis. antibody titration tested by indirect bacterial hemagglutination showed that significant increase in titer was noted in some cases, and antibody reacted most strongly with homologous antigen in most cases. However, n special relationship between antibdy titer and bacterial counts was observed.

靑壯年의 Prostatism

徐城鐸 中央醫學社 1970 中央醫學 Vol.18 No.3

외래 나환자 (癩患者) 의 임상적 (臨床的) 고찰 (考擦)

서성탁 대한피부과학회 1960 大韓皮膚科學會誌 Vol.1 No.1

The clinical and histopathological studies were carried out on 120 leprosy patients who visited the Department of Dermatology, Medical School Hospital, Kyungpook University during the period from October, 1957 to April, 1953. The results obtained were as follows; (1) By their clinical menifestations, patients were classified as follows: 39 out of 120 patients (32.5%) were suffering from Lepromatous leprosy, 43(35.3%) were found to be Tuberculoid, 7 were found to be Neural leprosy, 27(22.5%) to be Indeterminste and 4 were Borderline group. Virtually all of them were mild, early cases of leprosy. (2) Quite rarely, patients signs were resognized by others, and ill patients recognized their signs as leprosy by themselves. (3) Here in Korea, the leprosy is commonly called $quot;Pung$quot; which is included all types of leprosy, $quot;Mamok$quot; usually mems macules and $quot;San-Hu-Pung$quot; is a current name for Lepromatous leprosy of puerperal women. (4) 73 patients(60.8%) were found to have visited the hospital from the beginning and 38 patients consulted at onset so-called $quot;Han-j$quot; or a herb doctor. (5) Age of onset varied with the different typpes of leprosy and the sex of patients. (6) The site of initial lesion also varied with the leprosy type, but usually both upper and lower extremities were most frequently involved (40% resperctively), and face was vulnerable site next to both limbs. (7) As to its contributory factors, played as a factor in 1) cases of then, and in 17 cases, the direct, prolonged contact with the leprosy patients were found to be one of the contributory factors, and 13 women became leprous within 3 months after delivery. (8) D.D.S. was found effective in 77 cases (84.2%) and in 10 cases the results were excellent; on the contrary, 9 cases showed aggravatio after the administration. (9) The accuracy of clinical diagnosis as compared with the histopathologic diagnosis is as follows: Lepromatous leprosy 94.8%. Tuberculoid leprosy 65.1%, Indeterminate group 92.5% and Borderline group 100%

早期癩에 關한 硏究 : 第1編 病型分類에 關한 硏究 Part I. Studies on the Classification

徐城鐸 경북대학교 의학연구소 1964 慶北醫大誌 Vol.5 No.1

The classification of leprosy being used in Korea is in general based on the one decided at The International Leprosy Congress(1953), consisting of two principal types; lepromatous and tuberculoid, and two groups; indeterminate and borderline. There are no detailed reports on basic studies which apply this classification to leprosy patients in Korea, as yet. With the purpose of re-appraising the applicability of this classification in Korea, clinical, histopathological and immunological studies were made on 653 cases of fresh, early leprosy patients who visited Kyungpook University Hospital, Taegu, Korea, from January, 1958 to December, 1963 without previous treatment in their past history. The results were as follows: 1. According to the classification based on the clinical appearance of the lesion, L type was found in 190 cases (29.1%), T type in 199 cases (30.5%), I group in 222 cases (34.0%), B group in 34 cases (5.2%) and N type in 8 cases(1.2%). 2. According to the classification made on the histopathological findings, 207 cases were of L type (31.7%), 154 cases of T type (23.6%), 255 cases of I group (39.1%) and 37 cases of B group (5.6%). 3. The histopathological characteristics of each type and group were as follows: ① In all cases of L type lepromata were found was recognized in almost all cases. Atrophic and fibrotic changes of the dermis were more profound, but damage of peripheral nerves and changes of capillaries (hemangiectasis, hypertrophy and proliferation of endothelial cells) were less than in the T type. ② In T type there was a tuberculous granuloma, but no recognizable free zone. Atrophicand fibrotic changes of dermis were less marked than in L type, but damage to peripheral nerves and changes in capillaries were more marked than in L type. ③ I group showed nonspecific inflammatory changes and atrophic and fibrotic changes of the dermis and atrophic changes of skin appendages were mild. ④ In B group lepromatous and tuberculoid granulomata were found simultaneously. Giant cells were noted in about half of the cases and a free zone in 21.6% Other changes were similar to those of T type. 4. As a general rule it is reasonable to apply the histopathological diagnosis to differentiate between the types and groups of leprosy and to decide on the prognosis, only after clinical diagnosis is made. In particular, it is impossible to diagnose I group only on histological findings without support from the clinical diagnosis. 5. In 527 cases (80.7%) clinical diagnosis was found to coincide with histological diagnosis. In all the 653 patients, the rate of coincidence was highest in L type, and relatively low in T type and B group. 6. In general there ware relatively greater discrepancies between clinical and histological diagnoses in the type or group which presents macules. The macules of B group were especially prone to be confused with those of L type. 7. In cases which showed coincidence between clinical and histological diagnoses, bacteriological examination of the skin was positive in 100% of L type, in 23.7% of T type, 15.0% of I group and 82.6% of B group, but less cases were found to be positive in bacteriological examination of biopsies. 8. In lepromin reaction, there was the highest degree of coincidence between the Mitsuda late reaction and Dharmendra early reaction. Therefore, the significance of both reactions appears to be equal. The rate of agreement of both reactions was highest in L type and lowest in T type. 9. Although not much difficulty was found in applying the classification decided at the International Leprosy Congress in Korea, it seems necessary to re-examine the macules.

서산A지구 간월호 준설에 따른 담수용량 증가에 관한 연구

서성탁 한국환경관리학회 2009 한국환경관리학회 학술연구발표회 논문초록집 Vol.2009 No.7

콘크리트 구조물의 내구성 향상을 위한 보강콘크리트의 강도특성에 관한 연구

서성탁(Seung-Tag Seo) 한국환경관리학회 2019 環境管理學會誌 Vol.25 No.1

최근 경주지진과 포항지진은 건축물 및 사회기반시설에 많은 피해를 가져왔다. 이는 기존 시설물뿐만 아니라 신설구조물에 대한 콘크리트의 내구성 향상이 중요한 이슈가 되었다. 본 연구는 콘크리트의 성능 향상을 위하여 보강재료로서 강섬유와 탄소섬유, 아라미드섬유를 혼입시켜 그 강성변화에 대하여 검토하였다. 시험결과, 섬유 종류에 관계없이 섬유혼입에 따른 콘크리트의 압축강도는 거의 변화지 않았다. 그러나 보의 휨강도 시험에서는 섬유보강에 따른 강성변화를 확인할 수 있었다. 또한, 보공시체를 대상으로 유한요소 해석에 의한 섬유보강 콘크리트보의 거동을 확인하였다. Recently, the Gyeongju earthquake and the Pohang earthquake have caused much damage to buildings and infrastructure. It is important to improve the durability of concrete for new structures as well as existing facilities. The study is to investigate the change of stiffness by mixing steel fiber, carbon fiber, and aramid fiber as reinforcement material to improve the performance of concrete. As a result of the test, the compressive strength of the concrete with the Fiber mixing ratio almost unchanged regardless of the fiber type. But, the stiffness change of concrete due to fiber reinforcement was confirmed in the flexural strength test of the beam. Additionally, the behavior of the fiber reinforced concrete beams by finite element analysis was verified for the specimens.

교축방향 인장이음에 관한 연구

서성탁 ( Seung-tag Seo ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.2

합성상판을 시공하는 경우 교축방향에 분할된 저강판을 접합 일체화해야 한다. 본 논문에서는 강ㆍ콘크리트 합성상판을 대상으로 3종류의 배력철근 방향 이음구조를 제안하며, 보 공시체에 의한 정적ㆍ정점피로 실험한다. 그 결과 보의 피로실험 결과 저강판 혹은 고력볼트가 피로파단 하였으며, 3차원 FEM해석에 이음부의 휨 강성도 및 피로강도에 대해서 해석적으로 검토된다.