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강원모,김호건,Kang, Won-Mo,Kim, Ho-Kun 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.5
Silver particles were synthesized from silver nitrate by homogeneous precipitation and chemical reduction methods involving the intermediate silver cyanate. The obtained silver particles were characterized by XRD, SEM, TEM, and BET. Urea which could prevent the agglomeration of the reduced silver particles was used as a homogeneous precipitator. The spherical silver particles with average particle diameter of 100 nm were obtained under the optimum reaction conditions. The optimum synthetic conditions were found as follows: reaction temperature $100^{\circ}C$, reaction time 60 min, concentration of silver nitrate $1{\times}10^{-2}$ mol, urea $5{\times}10^{-3}$ mol, and sodium citrate $8.5{\times}10^{-4}$ mol. The phase of obtained silver particles was crystalline state and the silver particles were relatively dense, which had the surface area of $0.7571\;m^{2}/g$.
姜元模 공주대학교 교육연구소 2005 교육연구 Vol.19 No.-
이 연구는 최한기의 기화적 인식 체계와 교육관을 규명하는 데 그 목적이 있다. 최한기는 인식의 과정을 형질통과 추측통의 상호 작용으로 이해하였다. 감각적 경험은 공통적이지만 추측능력은 개인에 따라 다르다. 이것은 통의 불완전성을 의미하며 여기서 변통이 요구된다. 증험을 통하여 객관성을 확보해야 하는데 이렇게 얻은 객관적 기준이 준적이고, 절대 보편타당한 준적을 상도 또는 천인 운화의 준적이라고 한다. 아울러 최한기는 기의 본성을 활동 운화로 설명한다. 활동 운화란 모든 생명체의 본성이고 모든 개물은 활동 운화하는 본성을 공유하고 있는 생명체이다. 인간이나 사회도 끊임없이 변화하는 자연 법칙의 지배를 받으며 환언하면 인간 세계도 끊임없이 변화하여야 자연의 법칙에 순응할 수 있다. 인간은 자연적으로 결정된 존재가 아니라 변화 가능한 자율성을 가진 존재로 본다. 최한기;기회적 인식체계;기화적 교육관;氣師
개의 골신연술에서 키토산과 황화칼슘합제가 조기 골경화에 미치는 영향
강원모,장광호,장인호 한국임상수의학회 2002 한국임상수의학회지 Vol.19 No.2
The purpose of this study was to evaluate the effect of chitosan-calcium sulfate mixture on early bony consolidation in osteodistracted dogs. The experimental group was divided into 3 groups: saline group(Control), chitosan group(Group CH) and chitosan-calcium sulfate mixture group(Group CH+CS). Four dogs were allocated to each group and classified into 3 week observation subgroups and 5 week observation subgroups, respectively. Two dogs were allocated to each subgroup. The lateral surface of the left mandibular body was exposed in the subperiosteal plane and vertical osteotomy was carried out on the mandibular body. An external distraction device was applied to the mandibular body. Mandibular distraction was started 5 days after the osteotomy at a rate of 1 mm per day for a total of 10mm distraction for 10 days. After completion of distraction, chitosan, chitosan-calcium sulfate and saline were injected into the distracted zone of the group CH, group CH+CS and control. The external device was left in place for 3 or 5 weeks to allow for bony consolidation. Serial radiographs were carried out every week. Two dogs of each group, six dogs in total, were sacrificed at 3 weeks, and the other six dogs at 5 week after distraction. Bone specimens of the distracted mandibles were taken for histologic examination. New bone was not noted in the distracted zone of 3 week observation subgroups in the control and group CH. However, new bone was developed in the group CH+CS with a narrow fibrous interzone in the area of the distracted zone. While osteogenesis was mild in the margin of the distracted zone of 5 week observation subgroup in the control, new bone was noted much in the group CH and group CH+CS. However, osteogenesis was noted more significantly in the group CH+CS than that of group CH. In conclusion, chitosan-calcium sulfate mixture was more effective on early bony consolidation in distraction osteogenesis
노후 비도로용 차량의 배출가스 저감을 위한 SDPF 시스템의 버너 활용 가능성에 대한 연구
강원모,장형준,우상희,이상호,이상경,김홍석 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.8
When the SCR catalyst is coated on DPF instead of oxidation catalyst, the performance of DPF passive regeneration may be reduced. Consequently, it has been attempted to use a burner to enhance the performance of NOx removal and passive soot regeneration. This study sought to verify the feasibility of burner application in the SDPF system through a simple numerical analysis. Well-known chemical kinetics are considered in the numerical analysis to calculate soot oxidation in DPF and NOx conversion in SCR. All data necessary for calculations such as torque, power, emissions of engine, NO oxidation rate in DOC and etc. were obtained from experiments. Results showed that raising the target temperature of the burner was advantageous during SDPF passive regeneration. When the inlet temperature of SDPF was increased from 400 °C to 500 °C, the regeneration time of SDPF could be reduced from 24 % to 2.5 %. When a burner is used for NOx reduction, high burner target temperature has no significant effect on the improvement of NOx reduction rate, and it even makes fuel penalty worse. When the exhaust gas temperature was controlled at 220 °C, the NOx reduction rate was improved by 8.5 % with a fuel penalty of 3 %.