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공유수면 매립지내 폐석회 매립시설의 추가성토에 따른 장기침하 거동 분석
강정구,이연정,Kang, Jeong Ku,Yi, Yeun Jeung 한국지반신소재학회 2022 한국지반신소재학회 논문집 Vol.21 No.2
Recently, the reclamation of public waters has been on a downward trend due to environmental problems, but there is a limitation to evaluating environmental characteristics index uniformly. In this study, the stability of settlement behavior on public waters reclaimed land was analyzed using the experimental test. From the primary consolidation influence factors, the characteristics of the waste lime was similar that of clay in process of consolidation. Assuming that the waste lime landfill is the layer reinforced with thin geosynthetic reinforcement, the settlement was predicted by calculating the amount of increase using the Westergaard method. As a result of predicting settlement with degree of consolidation, it was found that the increase in stress was reduced by 40% when the surface layer of the soft ground was reinforce with geotextiles compared to the case where it was not reinforced. In addition, the consolidation behavior characteristics of clay and waste lime were compared using the correlation between the plasticity index and internal friction angle of waste lime. Since the waste lime in the public process of consolidation, it was predicted that long-term settlement will increase further.
Flexible, Tunable, and High Capacity Ultracapacitor using Nitron-Doped Graphene
정형모(Jeong, Hyung Mo),신원호(Shin, Weon Ho),최윤정(Choi, Yoon Jeong),강정구(Kang, Jeung Ku),최장욱(Choi, Jang Wook) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.11
We developed a simple method to synthesis a nitrogen doped graphene, nitrogen plasma treated graphene (NPG) sheets thought nitrogen plasma etching of graphene oxide (GO). X-ray photo electron spectroscopy (XPS) study of NPG sheets treated at various plasma conditions reveal that N-doping is classified to 3 kinds of binding configurations. The nitrogen doping concentration is at least 1.5 at % and up to 3 at% with changing of ratio of nitrogen configuration in NPG. Our group demonstrate ultracapacitor with high capacity and extremely durable using a NPG sheets that are comparable to pristine graphene supercapacitor, and pseudocapacitor using polymer and metal oxide with redox reaction, capacitance that are three-times higher, and a cycle life that are extremely stable. We also realized flexible capacitor by using the paper electrode that are coated by NPG sheets. NPG paper capacitor presented almost same performance compare with NPG on a metal substrate, and durability is much more enhanced than that. To additionally explain that how different kind of atoms in graphene layers can act as the ion absorption sites, we simulated the binding energy between nitrogen in graphene layer and ions in electrolyte. Increasing the energy density and long cycle life of ultracapacitor will enable them to compete with batteries and conventional capacitors in number of applications.
고선량율 근접치료기의 선원교정과 치료실주변 방사선량 측정
이정옥,강정구,문성록,Lee, Jeon-Gok,Kang, Jeong-Ku,Moon, Sun-Rock 대한방사선종양학회 1995 Radiation Oncology Journal Vol.13 No.1
High Dose Rate Remote Afterloading system was installed at Wonkwang University Hospital in January 1994. In this report, the calibration of a Gammamed 12-i High Dose Rate Remote Afterloading system and the radiation survey around the facility after design and construct a shieding room are discussed. The radiation survey of the facility indicates that the use of ordinary concrete shielding of existing room will provide adequate shielding. Also, the methodologies for performing source calibration are presented.
24 MV 의료용 선형가속기의 중성자 발생에 관한 연구
정동혁,강정구,이정옥,Jeong Dong Hyeok,Kang Jeong Ku,Lee Jeong Ok 한국의학물리학회 2005 의학물리 Vol.16 No.2
본 연구에서는 몬테칼로 계산(MCNPX 2.4.0)을 이용하여 24MV 의료용 선형가속기에서 발생하는 이차중성자의 에너지분포와 선량계산을 수행하였다. 먼저 선형가속기 두부(head)에서 방출되는 광자와 중성자의 에너지분포를 계산하였으며, 이를 이용하여 물팬텀에서 광자와 중성자의 흡수선량을 계산하였다. 몬테칼로 계산결과 물표면에서 5cm까지 중성자의 흡수선량은 $0.66\~0.35mGy/photon\;Gy$로 나타났으며, 상호작용 자료를 이용한 근사적 계산결과는 전자평형 깊이에서 0.52mGy/photon Gy로 나타났다. 다른 연구결과들과 비교를 통하여 본 연구가 고에너지 선형가속기에서 발생되는 중성 자의 선량평가에 응용될 수 있음을 제시하였다. The energy spectra and dose calculations were performed for secondary neutrons from a 24 MV LINAC using MCNPX code (V2, 4, 0). The energy spectra for neutrons and photons emitted from the LINAC head, and absorbed dose to water were calculated in water phantom. The absorbed doses calculated with Monte Carlo were $0.66\~0.35$ mGy/photon Gy at the surface to d=5 cm, and calculated with interaction data was 0.52 mGy/photon Gy at the depth of electron equilibrium in water. We have shown that this work can be applied to dose estimation of neutrons from high energy LINAC through the comparison of our results with other results.
선형가속기의 6 MV X-선에 대한 소형 조사면 측정과 몬테 카를로 시뮬레이션
정동혁,이정옥,강정구,김수곤,김승곤,문성록,Jeong Dong Hyeok,Lee Jeong Ok,Kang Jeong Ku,Kim Soo Kon,Kim Seung Kon,Moon Sun Rock 대한방사선종양학회 1998 Radiation Oncology Journal Vol.16 No.2
목적 : 방사선수술의 치료계획에 필요한 기본자료를 얻기 위하여, 6 MV X-선의 소형 조사면을 측정하고, 동일 조사면에 대한 몬테칼로 계산을 수행하여 그 결과를 측정한 자료와 비교하였다. 재료 및 방법 : 연구에 사용한 조사면은 SSD 100 cm에서 직경 1.0, 2.0, 그리고 3.0 cm인 원형의 소형 조사면이며, 각 조사면에 대한 심부선량백분율 (PDD)과 빔측면도 (Beam profile)를 구하였다. 측정에는 소형 반도체검출기, 물팬텀 그리고 원격조정 장치를 이용하였다. 몬테칼로 계산은 EGS4를 이용하여 수행하였으며, 계산에는 6 MV X-선의 에너지 분포와 확산빔 (divergent beam), 원형 조사면 그리고 물팬텀을 고려하였다. 결과 : 심부선량백분율의 경우, 계산값은 측정간에 비하여 낮은 경향을 보였으며, 모든 조사면에 대하여 물팬텀속 깊이 2.0-20.0 cm에서 차이는 0.3-5.7%의 범위로 평가 되었고, 표면 영역에서는 0.0-8.9%로 나타났다. 물팬텀속 깊이 10.0 cm에서 90% 선량폭은 몬테칼로 계산과 잘 일치하였으나, 반음영의 계산값은 모든 조사면에 대하여 측정값보다 0.1 cm 작게 나타났다. 결론 : 측정한 소형 조사면에 대한 심부선량백분율과 빔측면도는 몬테칼로 계산과 근사적으로 일치하였다. 팬텀 표면영역과 반음영 영역에서 측정값과 계산값의 차이가 많이 발생하였으며, 이러한 이유는 몬테칼로 계산 수행시 단순한 기하구조를 가정했기 때문이다. 따라서 실제의 기하구조와 조사면에 대한 보다 정확한 자료를 적용 할 수 있도록, 지속적인 연구를 해야 할 것이며, 몬테칼로 계산은 측정과 검증이 어려운 경우에 대하여 정확한 정보를 얻을 수 있는 유용한 도구로서 많이 이용 될 것이다 Purpose : In order to obtain basic data for treatment plan in radiosurgery, we measured small fields of 6 MV X-rays and compared the measured data with our Monte Carlo simulations for the small fields. Materials and Methods : The small fields of 1.0, 2.0 and 3.0 cm in diameter were used in this study. Percentage depth dose (PDD) and beam Profiles of those fields were measured and calculated. A small semiconductor detector, water phantoms, and a remote control system were used for the measurement Monte Carlo simulations were Performed using the EGS4 code with the input data prepared for the energy distribution of 6 MV X-rays, beam divergence, circular fields and the geometry of the water phantoms. Results : In the case of PDD values, the calculated values were lower than the measured values for all fields and depths, with the differences being 0.3 to 5.7% at the depths of 20 to 20.0 cm and 0.0 to 8.9% at the surface regions. As a result of the analysis of beam profiles for all field sizes at a depth of loom in water phantom, the measured 90% dose widths were in good agreement with the calculated values, however, the calculated Penumbra radii were 0.1 cm shorter than measured values. Conclusion : The measured PDDs and beam profiles agreement with the Monte Carlo calculations approximately. However, it is different when it comes to calculations in the area of phantom surface and penumbra because the Monte Carlo calculations were performed under the simplified geometries. Therefore, we have to study how to include the actual geometries and more precise data for the field area in Monte Carlo calculations. The Monte Carlo calculations will be used as a useful tool for the very complicated conditions in measurement and verification.