스트럿-타이 모델을 이용한 T형 깊은 보의 설계에 관한 연구

김종석,이승훈,이영호,진치섭 釜山大學校生産技術硏究所 2002 生産技術硏究所論文集 Vol.61 No.-

T형 깊은 보는 변형률 분포가 비선형성을 띄고 응력의 형태가 교란되어있어 일반적인 휨 이론으로는 해석이 불가능하다. 그러므로 T형 깊은 보는 스트럿-타이 모델의 사용이 필수적인 구조물이다. T형 깊은 보는 설계함에 있어 기존의 설계방법에 의하면, 구조물의 어느 한 부분은 매우 정확하게 설계하는 반면, 다른 부분은 과거의 경험 혹은 일반상식에 바탕을 두어 설계하여 왔다. 하지만 본 연구에서는 유한요소 해석 결과를 바탕으로 구성된 스트럿-타이 모델을 이용하여 T형 깊은 보에 대하여 설계하였다. 또한 재료의 비선형성을 고려한 비선형 스트럿-타이 모델과 선형 스트럿-타이 모델을 이용하여 얻은 각각의 해석 결과를 비교 분석하였다. T형 깊은 보의 설계에 있어서 스트럿-타이 모델을 이용한 설계는 기존의 방법보다 좀더 합리적이고 경제적인 설계법이라 판단할 수 있으며, 또한 비선형 스트럿-타이 모델을 사용하지 않고 선형 스트럿-타이 모델로 해석하여도 충분히 안전성을 확보할 수 있음을 알 수 있었다. Stress condition of T-shaped deep beam is very disturbed because the stain distribution is not linear. Hence, Strut-Tie model must be considered in design of T-shaped deep beam. If irrational design or irrational construction should be conducted, that may lose stability in capacity as structure. In current design practice, certain parts of structure are designed with extreme accuracy, while T-shaped deep beam is designed using common sense and experience. Therefore, it is generally very conservative. For that reason, logical, reasonable concept and accuracies are desired at design of T-shaped deep beam. Strut-Tie model satisfies those desires. In this paper, T-shaped deep beam is analyzed by considering nonlinear stain distribution. Strut-Tie model is constructed based on principle stress trajectory obtained from finite element analysis of T-shaped deep beam. The analysis result are compared with the specifications, and this paper presents that Strut-Tie model can be an economical design than current design methods without losing the degree of safety.

터널 및 地下採掘 現場에서의 V-CUT심빼기를 應用한 長孔發破에 對한 硏究

金益壽,鄭義鳳,金琮鈗,金鎭錫 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1

This research is on developing a new blasting technique which will complement the problems of the ordinary burn-cut blasting technique. This new technique employ a v-cut long hole blasting technique. the on-site testing of this v-cut technique has shown a number of advantages to the ordinary burn-cut blasting technique. When tested on the whole-section digging on the large section of a standard mining hole. the v-cut technique has shown the equivalent result to the ordinary burn-cut technique. However, the v-cut technique is more effective than the burn-cut technique, since it makes drilling simpler, and reduces both cost and amount of construction time.

Todorokite와 δ-MnO₂의 浮遊性에 關한 硏究

엄제현,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2004 産業科學技術硏究論文集 Vol.9 No.1

For the purpose of reserching the floatability of Manganese-nodule, the test was porformed by means of the Zeta potential measuring and the flotation experiment for Todorokite, δ-MnO₂ The flotation condition in the flotation experiment were as follow. sample : Todorokite, δ-MnO₂ sample size : 65 mesh - 200 mesh condition time : 10 min flotation time : 4 min air amount : 20 ㎖/min promoter : D.A.Cl, S.D.S pH regulator : HCl, CaO From the above test the flotation result were summerized as follow. 1. The point of zero charge(PZC) of Todorokite in the Zeta potential measuring was pH4.3. 2. The point of zero charge of δ-MnO₂ in the Zeta potential measuring was pH3.0. 3. The best floatability of 8 δ-MnO₂ was 85% as a function of pH3.5 using DACl 10㎎/ℓ 4. The best floatability of Todorokite was 40% as a function of pH3.5 using DACl 10㎎/ℓ 5. The most difference of floatability of the δ -MnO₂ and Todorokite was 40% using DACl 10m㎎/ℓ at pH3.5

10Å Manganite와 δ-MnO_(2)의 부유성에 관한 연구

엄제현,김익수,성일용,김종윤,김진석 三陟大學校 2006 論文集 Vol.39 No.-

For the purpose of researching the floatability of 10Å Manganite and δ-MnO_(2) from Manganese layer, the test was performed by means of the Zeta potential measuring and the floatation experiment for 10Å Manganite, δ-MnOcc. The floatation condition in the floatation experiment were as follow. Sample : δ-MnO_(2), 10Å Manganite from Manganese layer Sample size : 65mesh ~ 200mesh. condition time : 10min. Flotation time : 4 min. Air amount : 20ml/min. Promoter : DACl, NaDS, Kerosene Dpresser : Na_(2)SiO_(2)(Water glass) PH regulator : HCl, CaO From the above test the floatation result were summerized as follow. 1) It was PH 2.3 that the PZC of the 10Å Manganite - rich from Manganese nodule in the ξ - potential measuring. 2) It was PH 3.0 that the PZC of the δ-MnO_(2)- rich from Mangnaese nodule in the ξ - potential measuring. 3) It was 35% using DACl 15mg/l at PH 2.7 that the most difference of floatability of the δ-MnO_(2)- rich and 10Å Manganite - rich.

Micromanganese-Nodule의 選鑛에 관한 硏究(제1보)

엄제현,박동기,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.4

For the purpose of researching of the manganese recovery from the micromanganese-nodule, the test was performed by means of the ζ-potential measuring and of the floatation experiment for manganese recovery of the micromanganese nodule obtained from siliceous deep sea clay. The floatation condition in the floatation experiment were as follow. Sample size : 65mesh∼200mesh. Condition time : 10 min. Flotation time : 4 min. Air amount : 20㎖/min. Promoter : DAS, NaDS. Kerosene Dpresser : Na_2SiO_3(Water glass) PH regulator : HCl, CaO From the above test the flotation results were summerized as follow. (1) ζ-potential of micromanganese-nodule was minus(-) in the pH 3∼12. (2) The manganese recovery from the micromanganese- nodule was the best at pH 7. (3) The manganese recovery from the micromanganese- nodule was the best using DACI 50㎎/ℓ + kerosene 200㎎/ℓ in the promoter at pH 7. (4) The best manganese recoverv of the micromanganese-nodule was 80% using DACI 50㎎/ℓ + kerosene 200㎎/ℓ in the promoter and water glass 500㎎/ℓ in the depresser at pH 7. In the futurity, continuous study of the micromanganese-nodule in many kinds of site should be required.

황산화 부선법에 의한 방연광의 억제에 관한 연구

엄제현,박동기,김익수,성일용,김종윤,김진석 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.1

The applicability of a sulphation-floatation process was considered in order to depress of galena in a mineral processing process of complex sulphide ores. The galena will be depressed in the floatation step because of the formation of a PbSO₄ film on the surface of galena. when a PbS bulk concentrate is treated with sulphuric acid. The optimum conditions of the sulphation treatment for depressing galena were found to be 30%. and about 5 minutes of retention, with 18 Vol. % H₂SO₄. under these conditions. galena was sulphated only slightly and thus in complete depression in the floatation.

Micromanganese-Nodule의 選鑛에 關한 硏究(제2보)

엄제현,박동기,김익수,성일용,김종윤,김진석 三陟大學校 2003 論文集 Vol.36 No.-

For the purpose of researching of the micromanganese-nodule floatability, the test was performed by means of the flotation experiment. The sample of flotation experiment used the micromanganese nodule obtained from siliceous deep-sea clay. The flotation condition in the flotation experiment were as follow. Sample size : 65mesh ∼ 200mesh Conditioning time : 10min Flotation time : 4min Air amount : 20㎖/min Promoter : DACI, Kerosene pH regulator : HCI, CaO From the above test the flotation results were summerized as follow. (1) The micromanganese nodule recovery was the best at pH 7∼9 (2) The micromanganese nodule recovery was the best using DACI+Kerosene in the promoter at pH 7. (3) The best recovery of micromanganese nodule was 80% using DACI 50㎎/ℓ +Kerosene 200㎎/ℓ in the promoter at pH 7.

Nanoplasmonics: Enabling Platform for Integrated Photonics and Sensing

Jong-Souk Yeo 한국진공학회 2015 한국진공학회 학술발표회초록집 Vol.2015 No.8

[성원에드워드학술상] Nano Convergence Systems for Smart Living

Jong-Souk Yeo 한국진공학회 2015 한국진공학회 학술발표회초록집 Vol.2015 No.8

Nature-Inspired Technologies through Nano-Bio Convergence

Jong-Souk Yeo 한국진공학회 2018 한국진공학회 학술발표회초록집 Vol.2018 No.8