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Effects of Crystallization Behavior on Microwave Dielectric Properties of CaMgSi2O6 Glass-Ceramics
최보경,김응수 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.1
Dependence of microwave dielectric properties on the crystallization behaviors of CaMgSi2O6 (diopside) glass-ceramics was investigated with different heat treatment methods (one and/or two-step). The crystallization behaviors of the specimens, crystallite size and degree of crystallization, were evaluated by differential thermal analysis (DTA), scanning electron microscope (SEM) and X-ray diffraction (XRD) analysis by combined Rietveld and reference intensity ratio (RIR) methods. With an increase in heattreatment temperature, the dielectric constant (K) and the quality factor (Qf) increased due to the increase of the crystallite size and degree of crystallization. The specimens heat-treated by the two-step method had a higher degree of crystallization than the specimens heat-treated by the one-step method, which induced improvement in the quality factor (Qf) of the specimens.
권력과 정치적 권위의 문제에서 바라 본 墨子의 정치사상
최보경 고려대학교 중국학연구소 2022 中國學論叢 Vol.- No.76
The aim of this paper is to study political thought of Mozi on power and political authority. Political thought of Mozi is the establishment and operation of a political system based on Shangtonglun(尙同論). Shangtong(尙同)'s logic should respect and follow the opinions of superiors, which have the return to feudalism centered at Tianzi(天子) and a vertical characteristics of the upper and lower. Therefore the challenge arises from two aspects. First, it did not reflect the political landscape at that time. Second, it is in conflict with his ethical ideology[兼愛]. These problems can be solved when political thought of Mozi is interpreted in terms of power and political authority. This becomes the theoretical basis for solving the two difficulties implied in Shangtonglun(尙同論). First, since the logic of homology is also applied to Tianzi(天子), the power of Tianzi(天子) can secure political authority by Tian(天). The attribution of Tian(天) is a premise that can induce voluntary obedience of the people because it is unselfish. Second, Tianyi(天意) is Jianai(兼愛). Tianzi(天子) must observe the horizontal ethical principles of Jianai(兼愛), so the power of Tianzi(天子) guarantees morality. As a result, the power of Tianzi(天子) will secure autonomous obedience and morality through the symbol of Tian(天).
최보경,국윤수,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The crystallization, exothermic, and electrochemical properties of coaltar pitch-based carbon fibers (CFs) with various temperatures were studied. The CFs were prepared from stabilized pitch-based carbon fiber at 500°C, 700°C, 900°C, and 1100°C with 60 min. The surface and structural properties of the ACF were determined by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. N<sub>2</sub> adsorption isotherms at 77K were investigated by BET and BJH methods to characterize specific surface areas and pore volumes. The electrical conductivity was obtained by measuring the surface resistance with four probe method.
최보경,강승욱,박수진,서민강 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The catalytic graphitization, crystallization, exothermic, and electro properties of polyacrylonitrile (PAN)-based carbon fibers with and without electroless Ni-P coatings of various heat treatment temperatures were studied. The surface and structural properties of the PAN-based carbon fibers were determined by scanning electron microscope (SEM), X-ray diffraction (XRD), and Raman spectroscopy, respectively. P content in the Ni-P coatings was measured by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The thermal characterization of the PAN-based carbon fibers was studied by thermo-graphic camera and differential scanning calorimetry (DSC). The electrical conductivity was obtained by measuring the surface resistance with 4-pin probe method.
최보경,이옥정,박윤경,임태효,김상단 한국방재학회 2016 한국방재학회논문집 Vol.16 No.5
In this study, the stormwater capture ratio and load capture ratio are actually estimated using TP monitoring data and SWMM modeling. From such ratios’ estimation, uncertainties involved in the existing stormwater and load capture ratios and the relative impact of these uncertainties on the performance evaluation of designed non-point sources pollution control facilities are quantified. The study area is a small drainage catchment in the Busan Noksan industrial zone in order to exclude the effect of unnecessary uncertainty caused by various land use patterns. An interlocking module between SWMM and Matlab is used to estimate efficiently model parameters. As a result, main uncertainty in designing non-point sources pollution control facilities is due from underestimation of the stormwater capture ratio. Hence, the present stormwater capture ratio should be improved. 본 연구에서는 총인 모니터링자료와 SWMM 모델링을 이용하여 강우유출수 처리비와 삭감대상부하비가 산정된다. 이를 통하여 강우유출수 처리비와 삭감대상부하비 산정에 포함된 불확실성과 이러한 불확실성이 설계된 비점오염저감시설의 성능평가에 미치는 상대적인 영향이 정량화된다. 대상지역은 부산광역시에 위치한 녹산공단의 소규모 배수분구를 선정하여 토지이용패턴에 따른 불확실성을 사전에 배제하고자 하였으며, SWMM을 이용한 모델링에서의 효율적인 매개변수 추정을 위하여 SWMM-Matlab 연동 모듈이 이용된다. 분석결과 우리나라 비점오염저감시설 설계 시의 주요 불확실성은 강우유출수 처리비의 과소산정으로부터 기인하고 있으며, 따라서 현재 사용되고 있는 강우유출수 처리비 공식의 개선이 필요함을 살펴볼 수 있다.
Successful Treatment of a Ruptured Aortic Arch Aneurysm Using a Hybrid Procedure
최보경,이한철,이혜원,박진섭,오준혁,김상필,차광수 대한심장학회 2011 Korean Circulation Journal Vol.41 No.8
Aortic rupture has a high mortality rate and can be considered a medical emergency. The standard treatment for aortic rupture is surgical repair. An aortic stent graft for a ruptured descending aorta is considered an effective alternative treatment. However, an aortic stent graft is difficult when the aortic aneurysm is in the aortic arch due to supra-aortic vessels. We report on a patient with a ruptured aortic arch aneurysm treated with a hybrid procedure, which involved a carotid to carotid bypass operation and an aortic stent graft. A 71-year-old male patient visited our cardiovascular center suffering from hemoptysis. The chest CT and aortography showed a 9 cm sized aortic arch aneurysm 0.5 cm distal to the left subclavian artery and a hemothorax in the left lung. The patient refused to undergo a full open operation. We performed a carotid to carotid bypass in advance, and two pieces of aortic stent grafts were placed across the left carotid artery and left subclavian artery. The follow up CT showed the aortic stent grafts, no endoleaks and no thrombus in the aortic arch aneurysm. The patient was discharged from the hospital without complication.