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환경친화형 공정을 이용한 cost-effective 나노기공 실리카 고속합성 제조기술
김희택 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
본 발표는 기존의 나노기공 실리카 제조방법인 침강형 및 겔형 공정의 단점 및 문제점들을 보완한 신규 제조공정 기술 및 제품개발에 관한 것으로, 중합시간(50~80시간)을 10시간 이내로 단축하고, 상온에서 균일한 물성제어가 가능하며 염기성 촉매를 사용하지 않는 중성 조건에서의 공정에 의한 세척수 사용 절감 등 환경 친화적 제조공정을 통해 나노기공 실리카를 합성하는 제조 기술이다. 본 기술의 완성에 의해 연속 무기 중합체 제조 뿐 아니라 유기 기능성 소재 합성에도 적용 가능하며 더 나아가 유·무기 하이브리드 제조 공정에도 응용할 수 있는 새로운 제조기술이라 사료된다.
김희택,남창규,배성한 대한동의병리학회 2001 동의생리병리학회지 Vol.15 No.5
Smell is one of the six human senses and for some individuals is a very important sense and means a great deal more than inst the ability to taste and enjoy food. In order to understand the cause of the taste and smell dysfunction a detailed, specific medical history is necessary and it is well known that olfactory dysfunction relates to many etiologies such as obstructive nasal and sinus diseases, upper respiratory tract infections, head trauma, aging, congenital anomalies, endocrine diseases, drugs and so forth. Among these, the most common causes of olfactory disturbance were upper respiratory infectiom and nasal or sinus disease. We report the case of a 55-year-old male patient who had anosmia before several day and the most obvious and primary complaint is that food no longer has a taste, We treated this case(Olfactory disturbance) with Ryetaktongi-tang and Acupunture, and were improved. so we report it.
Numerical Analysis of Turbulent Gas-Particle Flow and Coal Combustion in a Fluidized-Bed Calciner
김희택,오세천,김동욱,윤준용,변성준,권우택,김수룡 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.2
In this paper, we analyze numerically the characteristics of turbulent gas-particle flow, heat transfer, and coal combustion process in a fluidized-bed calciner for a cement manufacturing process. The simulation model was based on FLUENT, a commercially avaliable fluid dynamics code. The effects of the mutual interactions between particles were simulated by a discrete phase modeling approach, while the decomposition of calcium carbonate into calcium oxide and carbon dioxide upon heating was handled by a finite-rate reaction modeling approach. To verify the validity of the numerical simulation approach used in this work, the simulation results were compared with field data, for example, the gas velocity and temperature in some sampling points. The simulation results showed comparatively good correlations with the field data.
김희택,Pradip Bhikaji Sarawade,Jong-Kil Kim,Askwar Hilonga 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.4
The experimental results of aging time and temperature on the textural properties of water-glass (sodium silicate)-based silica aerogels are reported and discussed. Aging of the hydrogel for different times and temperatures led to an ability to increase the stiffness and strength of the networks. These improvements enabled the gel to withstand ambient pressure drying (APD) and, consequently, preserve the highly porous silica network without collapse. The pore size and volume increased with increasing aging temperature and time, while the specific surface area decreased. Monolithic aerogels with extremely low bulk density (~0.069 g/cm3), high specific surface area (820 m2g−1), large cumulative pore volume (3.8 cm3g−1), and high porosity (~96%) were obtained by aging at 60 oC for 18 hours. Therefore,easy synthesis of monolithic silica aerogels at ambient pressure is achievable using a relatively inexpensive silica precursor (sodium silicate).
Formation and Surface Modification of Fe3O4 Nanoparticles by Co-precipitation and Sol-gel Method
김희택,Ki Do Kim,Sung Soo Kim,좌용호 한국공업화학회 2007 Journal of Industrial and Engineering Chemistry Vol.13 No.7
Fe3O4 nanoparticles were synthesized by co-precipitation of Fe3+ and Fe2+ with NH4OH, and then silica was coated onto the surface of Fe3O4 by hydrolysis of TEOS. Coupling agent was also coupled with the surface of the nanoparticles and protein was immobilized. Morphology, particle size, and magnetic properties of the nanoparticles were characterized by TEM, DLS, and VSM, respectively. As a result, silica coated Fe3O4 nanoparticles with an average size of 15 nm were obtained and super-paramagnetic properties were achieved.
甲狀腺機能亢進症에 있에서 RAIU, 血淸 T_3 및 T_4의 診斷的 意義
金熙宅,黃基錫 慶北大學校 醫科大學 1980 慶北醫大誌 Vol.21 No.2
著者들은 1980年 6月부터 1980年 10月까지 慶北醫大附屬病院 核醫學科에서 診斷한 91例의 甲狀腺機能亢進症 患者에서 RAIU, 血淸 T_3, 血淸 T_4 및 T_4/T_3를 測定하고 이들의 診斷的 意義를 檢討하여 다음과 같은 結果를 얻었다. 1) RAIU에서는 91例中 84例에서 增加하였으나 나머지 7例에서는 正常 또는 正常 以下로 低下되었다. 2) 血淸 T_3値 및 血淸 T_4値는 全例에서 例外없이 增加하였다. 3) T_4/T_3에 있어서는 91例中 79例에서 血淸 T_3値가 血淸 T_4値보다 不平衡하게 上昇하였다. 4) 甲狀腺機能亢進症에 있어서는 RAIU, 血淸 T_3 및 血淸 T_4 중 血淸 T_3가 가장 有用한 診斷的 檢査라고 생각되었다. The authors assessed a diagnostic value of RAIU, serum T_3, T_4 and T_4/T_3 in 91 patient with hyperthyroidism seen from June 1980 and to October 1980 at the Department of Nuclear Medicine, Kyungpook National University Hospital with the following results: 1) The RAIU % increased in 84 cases out of the total 91 patients, the remainder being the normal range or rather decreased. 2) Both serum T_3 and T_4 levels increased in all patients. 3) T_4/T_3 determinations revealed a dispropotionate increased serum T_3 comparing with serum T_4 in 79 cases. 4) The serum T_3 determination is considered to be the most reliable test in the diagnosis of hyperthyroidism among RAIU, both serum T_3 and T_4.