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      • KCI등재

        감마선 조사된 $\alpha$-$Al_2$$O_3$의 열자극에 관한 수치해석적인 분석

        김태규,이병용,김성규,박영우,추성실 한국의학물리학회 1993 의학물리 Vol.4 No.2

        열자극 과정의 수치해석적인 방법을 이용하여 열자극 세기곡선의 kinetic order, 활성화 에너지, 이탈 진동수 그리고 초기 트랩 밀도를 구하기 위하여 혼합된 열자극 세기곡선으로 분해하였고, 비선형 최소 자승법으로 분해된 열자극 곡선 세기와 측정된 세기의 차이를 최소화시켰다. 감마선 선량계로 사용되고 있는 $\alpha$-Al$_2$ $O_3$ 에감마선을 조사시킨 후 ,300K~600K의 온도 구간에서 측정된 $\alpha$-Al$_2$ $O_3$의 열자극 발광 세기곡선은 정점 온도가 381K, 415K, 441K, 460K, 488K 그리고 506K인 6개의 독립된 열자극 발광세기곡선으로 분해되었으며, 381K의 정점온도를 갖는 분해된 열자극 발광 세기곡선의 kinetic order, 활성화 에너지 그리고 이탈 진동수는 각각 1, 1.12eV 그리고 6.79X$10^{12}$sec$^{-1}$로써, 이 결과는 다른 측정법에 의한 값과 유사하였다. The complex glow curves were split into isolated glow curves to be calculated the values of kinetic order, activation energy, escape frequency and density of initial trap from the independent glow curves using the mathematical method of thermally stimulated processes. The minimization of the intensity difference between measured and theoretical glow curve was done by the nonlinear least-square program. The results of the fitted curves were almost equal to the actual values of the parameters. Thermoluminescence from gamma ray irradiated ${\alpha}$-Al$_2$ $O_3$ over the range of 300K to 600K was split into six glow curves. The kinetic order, activation energy and escape frequency of first glow curve were obtained as 1, 1.12eV and 6.79X10$\^$12/sec$\^$-1/, respectively, which were similar to the results of other method. Also the parameters of the second and the third glow curve and so forth were calculated.

      • KCI우수등재

        바이오필터와 황-석회석을 이용한 마을하수 처리 공정 개발

        김태규,Kim, Tae-Kyu 한국농공학회 2007 한국농공학회논문집 Vol.49 No.2

        This process which has a connection of biofilter and sulfur-limestone has been developed to treat organic substances including BOD, COD and SS etc. and to treat sulfur-limestone is for denitrification.. The whole process consists of chemical reaction tank, sedimentation tank, trickling filter, denitrification tank The trickling filter is equipped with a reactor filled with absorptive filter, and the sulfur denitrification tank is filled with sulfur-limestone mixed media. After setting up practical facilities whose capacity is 60 tons a day, we have observed the removal efficiencies of pollutants through 60 experiments during Summer and Winter seasons. The average concentration of polluted water was BOD for 3.6 mg/L, $COD_{Mn}$ for 11.3 mg/L, SS for 2.8 mg/L, T-N for 8.6 mg/L, and T-P for 0.8 mg/L, and the rate of treatment efficiencies 96.5%, 84.7%, 96.5%, 79.2%, and 80.8%, respectively was found through the experiments. The average treatment efficiency for BOD and $COD_{Mn}$ was 85.0% and 55.7%, respectively and the average removal efficiency for NH4+-N was 84.9% in the trickling filter. The removal efficiency in the denitrification tank is as follows; The removal rate of $NO_3^--N$ was as high as 93.2% within the compass of pH 6.3 to 7.3 through $16.8{\sim}37.0mg/L$ flown into $NO_3^--N$ and $0.1{\sim}8.3mg/L$ outflown. It had observed that this process has implemented highly efficient and advanced treatment without external carbon sources and internal recycle during its process. In conclusion, this process is suitable for a sewerage in a small village due to the merits of low power consumption and easy maintenance.

      • 초소형 비행체를 위한 초소형 연료전지의 설계 및 제작

        김태규 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.11

        초소형 비행체를 위한 초소형 연료전지의 설계 및 제작을 수행하였다. 초소형 연료전지는 초소형 PEM 연료전지와 NaBH4 수소발생용 초소형 반응기로 구성된다. 연료카트리지, 펌프, 보조전원과 같은 모든 BOP를 통합하여 완전한 초소형 동력장치를 제작하였고, 마이크로 연료전지의 성능을 측정하였다. Design and fabrication of micro fuel cell for micro aerial vehicles was carried out. The micro fuel cell system consists of two main components; one is a micro PEM fuel cell and the other is a microreactor for hydrogen generation from NaBH4 alkaline solution. All of BOP such as a fuel cartridge, a micropump, and an auxiliary battery were integrated for a complete micro power device, and the performance of the micro fuel cell system was measured.

      • KCI등재

        대류실험 장치의 개발 및 활용

        김태규 한국물리학회 2018 New Physics: Sae Mulli Vol.68 No.1

        A convectional experiment apparatus has been developed so that convective experiments can be performed normally in the science class. The apparatus is composed of a convection box, a light source box, the object, and a smoke box with an incense stick. The reproducibility of convective experiments was ensured by them controlling the variables and quantifying the measured values. The characteristics of the smoke flowing from the incense stick depended on the size of convection box, the spacing of objects, and the height, position and depth of the ember of the incense stick. Those characteristics were also affected by the flow speed of rising smoke and the differences between the surface temperature of the objects and the temperature inside the convection box. Changes in those characteristics and in the direction of smoke flow, in particular a reversal of direction, with changing surface temperature of the objects were continuously measured. The experimental convection device developed in this study can be utilized in experiments related to convection. 대류실험을 교육 현장에서 정상적으로 실시할 수 있도록 대류실험 장치를 개발하였다. 장치는 크기를 변화시킬 수 있는 대류상자, 대류상자 내부를 비추는 광원상자, 표면 온도를 변화시킬 수 있는 물체 및 선향 연기의 유량 및 유속을 조절할 수 있는 선향 연기 상자로 구성되어 있다. 변인의 통제 및 측정값의 계량화로 정량적인 실험을 수행하여, 대류실험의 재연성을 확보하였다. 선향 연기 흐름의 기울어짐은 대류상자의 가로, 세로 및 높이, 선향 불씨의 높이, 위치 및 깊이에 의존하였다. 또한 상승하는 선향 연기의 유속 뿐 만 아니라 물체와 대류상자 내부의 온도차도 선향 연기 흐름의 기울어짐에 영향을 주었다. 물체의 표면 온도의 변화에 따라서, 선향 연기 흐름의 기울어짐이 변하고 선향 연기 흐름의 방향이 역전되는 과정을 연속적으로 측정하였다. 본 연구에서 개발된 대류실험 장치를 대류와 관련된 실험에서도 활용할 수 있다.

      • KCI등재

        Patterns of initial failure after resection for gallbladder cancer: implications for adjuvant radiotherapy

        김태규 대한방사선종양학회 2017 Radiation Oncology Journal Vol.35 No.4

        Purpose: This study sought to identify potential candidates for adjuvant radiotherapy and patterns of regional failure in patients who underwent curative-intent surgery for gallbladder cancer. Materials and Methods: Records for 70 patients with gallbladder cancer who underwent curative resection at a single institution between 2000 and 2016 were analysed retrospectively. No patients received adjuvant radiotherapy. Initial patterns of failure were evaluated. Regional recurrence was categorized according to the definitions of lymph node stations suggested by the Japanese Society of Hepato-Biliary-Pancreatic Surgery. Results: Median follow-up was 23 months. Locoregional recurrence as any component of first failure occurred in 29 patients (41.4%), with isolated locoregional recurrence in 13 (18.6%). Regional recurrence occurred in 23 patients, and 77 regional recurrences were identified. Commonly involved regional stations were #13, #12a2, #12p2, #12b2, #16a2, #16b1, #9, and #8. Independent prognostic factors for locoregional recurrence were ≥pT2 disease (hazard ratio [HR], 5.510; 95% confidence interval [CI], 1.260–24.094; p = 0.023) and R1 resection (HR, 6.981; 95% CI, 2.378–20.491; p < 0.001). Conclusion: Patients with pT2 disease or R1 resection after curative surgery for gallbladder cancer may benefit from adjuvant radiotherapy. Our findings on regional recurrence may help physicians construct a target volume for adjuvant radiotherapy.

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