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PEG / NaI 혼합촉매에 의한 Phenyl Glycidyl Ether 와 이산화탄소의 반응에 관한 속도론적 고찰
박대원,문정열,양정규,박상욱,이진국 ( Dae Won Park,Jeong Yeol Moon,Jeong Gyu Yang,Sang Wook Park,Jin Kook Lee ) 한국공업화학회 1995 공업화학 Vol.6 No.6
A kinetic study on the addition reaction of carbon dioxide and phenyl glycidyl ether(PGE) was investigated. NaI and polyethylene glycol(PEG-4000) was used as mixed catalyst, and the reaction was carried out using autoclave. A method to calculate rate constant and Henry`s law constant of CO₂ was proposed by measuring CO₂ pressure. The reaction was first order to the concentration of PGE and CO₂ respectively. The reaction rate constant(k) was 0.334 ℓ/㏖·min and Henry`s constant(H´) was 7.4×10^(-4) ㏖/ℓ·㎪.
박대원,정진영,정윤철,윤운영 ( Dae Won Park,Jin Young Jung,Yun Chul Chung,Woon Young Yun ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.2
Experiments were conducted to investigate the effect of MLSS concentration on the performance of a sequencing batch reactor (SBR) treating industrial wastewater containing high concentration of organics and nitrogen. Three laboratory-scale reactors were designed and operated at different MLSS concentration. Total organic carbon and nitrogen concentration in the reactors were monitored over reaction time. The higher MLSS concentration in the reactor resulted in the greater COD removal rate with up to 1.24㎏ COD/㎥.day. The higher MLSS concentration resulted in the lower TOC concentration in the effluent. It was observed from monitoring ammonia in the reactor that the higher MLSS concentration in the reactor resulted in the higher rate of ammonia oxidation and the earlier production of NO₃-N. MLSS concentration was observed to be an important factor determining removal rate of organic and ammonia
박대원,송재용,한주섭,길경석,Park Dae-won,Song Jae-yong,Han Joo-sup,Kil Gyung-suk 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.6
본 논문은 외부의 서지로부터 컴퓨터 네트워크회로의 보호를 위한 서지방호장치에 대하여 기술하였다. 서지방호장치는 동작속도가 빠른 아발란시 다이오드와 에너지 내량이 큰 가스튜브의 하이브리드형으로 구성하였으며, 고주파 대역에서의 삽입손실을 줄이기 위하여 고속회복 다이오드를 사용하였다. 제안한 서지전압 차단장치의 성능 평가를 위하여 국제규격 IEC 61000-4-5 및 IEC 61643-21에 따라 서지차단특성과 신호전송 특성평가를 수행하였다. 실험결과로부터 본 서지차단장치는 국제규격에 제시된 서지차단특성을 만족하였으며, -3dB의 고역차단 주파수가 204 MHz로 100 Mbps급 근거리 통신네트워크에 적합한 특성을 나타내었다. This paper dealt with the development of surge protection devices (SPDs) that can protect high speed computer network devices from overvoltages caused by switching operations or lightning surges. The designed SPD is a form of hybrid circuit which is composed of a gas tube having large current diverting capability, high response bi-directional avalanche diodes, and fast recovery diodes to reduce insertion loss on high frequency domain. Surge protection and signal transmission characteristics of the fabricated SPD was tested according to the international standards, IEC 61000-4-5 and IEC 61643-21. From the test results, the SPD is satisfied with the international standards and the high cut-off frequency was 204 MHz. Also, the SPD showed a good performance without an insertion loss on a field test of 100 Mbps class Local Area Network.
박대원,이정윤,길경석,Park, Dae-Won,Lee, Jung-Yoon,Kil, Gyung-Suk 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.9
This paper dealt with the measurement and analysis of electromagnetic waves radiated from a partial discharge (PD) source in insulation oil to apply condition monitoring of oil-immersed transformers. Two types of narrow-band monopole antennas with the resonant frequency of a 500 MHz and a 1 GHz were designed and fabricated. Also, a needle-plane electrode system was manufactured to simulate PDs and the curvature radius of the needle is 10 ${\mu}m$ and the diameter of the plane is 60 mm. Electromagnetic wave was measured by the PD measurement system with the monopole antennas. Detection sensitivity of the fabricated antenna was compared for the same PD magnitude; 620 $mV_{peak}$ for the 500 MHz antenna and 960 $mV_{peak}$ for the 1 GHz antenna to the PD magnitude of 74 pC. Consequently, the 1 GHz monopole antenna is more effective to detect PDs in oil-immersed transformers.
아크롤레인 선택 산화반응에서 Mo-V-O와 SnO<sub>2</sub>의 상간협동 - II. 담지촉매 -
박대원,나석은,김경훈,이원호,정종식,Park, Dae-Won,Na, Suk-Eun,Kim, Kyung-Hoon,Lee, Won-Ho,Chung, Jong Shik 한국공업화학회 1994 공업화학 Vol.5 No.2
$Mo-V-O/SnO_2$(VM/Sn) and $SnO_2/Mo-V-O$(Sn/VM) catalysts have been prepared and characterized by XRD, BET, SEM and TPD of ammonia. The catalytic reaction of acrolein oxidation with these catalysts, in a continuous-flow fixed-bed reactor, showed that they had higher conversion of acrolein and higher yield of acrylic acid than those of Mo-V-O itself. The origin of the observed synergy studied by TPD, TPR and TPO is explained by the cooperation of $SnO_2$ and Mo-V-O at their interfaces where electrons flow from Mo-V-O phase to $SnO_2$ and $SnO_2$ produces spill-over oxygens, which, by being transported onto the surface of Mo-V-O, reoxidize the partially reduced active sites. 담지촉매인 $Mo-V-O/SnO_2$(VM/Sn)와 $SnO_2/Mo-V-O$(Sn/VM) 촉매를 제조하여 XRD, BET, SEM, $NH_3$, TPD 등으로 특성분석을 실시하였다. 고정층 연속 반응기에서 아크롤레인의 산화반응을 수행한 결과 이들 촉매의 아크롤레인 전화율과 아크릴산 수율이 Mo-V-O 자체보다 높았다. 이와 같은 상승효과의 원인을 TPD, TPR, TPO 등의 방법으로 고찰한 결과 Mo-V-O와 $SnO_2$의 접촉면에서 Mo-V-O가 $SnO_2$ 상으로 전자를 전달하고 $SnO_2$는 spill-over oxygen을 Mo-V-O 상으로 전달함으로써 반응에 의하여 부분환원된 Mo-V-O의 재산화를 촉진시키는 상간협동 현상이 존재하기 때문으로 판단되었다.
Aliquat 336 상이동 촉매하에서 디페닐메탄의 산화에 의한 벤조페논의 합성
박대원,이화수,문정열,박상욱,신정호 ( Dae Won Park,Hwa Soo Lee,Jeong Yeol Moon,Sang Wook Park,Jung Ho Shin ) 한국공업화학회 1994 공업화학 Vol.5 No.1
본 연구는 Aliquat 336 상이동 촉매와 potassium tert-butoxide 염기를 사용하여 상온에서 디페닐메탄올 산화시켜 벤조페논을 합성하는데 관한 것이다. 4급 암모늄염 촉매 존재하에서는 벤조페논이 합성되지 않는다고 보고된 다른 연구결과와는 달리 Aliquat 336 촉매로 상온에서 30% 이상의 벤조페논 수율을 얻었다. Aliquat 336 촉매의 양과 potassium tert-butoxide의 양이 증가할수록 디페닐메탄의 전화율이 증가하였다. 산소의 분압이 높을수록 유기용매에 녹아 있는 산소의 농도가 증가하여 전화율과 선택도가 상승하였다. 또한 A1iquat 336 촉매의 역할이 포함된 반응 메카니즘을 제시하였다. Synthesis of benzophenone by oxidation of diphenylmethane at room temperature is studied using Aliquat 336 as phase transfer catalyst and potassium tert-butoxide as base. No other study has shown that diphenylmethane can be oxidized to benzophenone with quaternary ammonium salt as phase transfer catalyst. However, in presence of Aliquat 336, higher than 30% of benzophenone was yielded. The conversion of diphenylmethane was increased with increasing amount of Aliquat 336 and potassium tart-butoxide. Higher partial pressure of oxygen favored conversion of diphenylmethane and selectivity of benzophenone by increasing the concentration of oxygen in organic solvent. A reaction mechanism involving the role of Aliquat 336 was also proposed.
상이동 촉매에 의한 Phenyl Glycidyl Ether 와 이산화탄소의 부가반응
박대원,문정열,양정규,박성훈,이진국 ( Dae Won Park,Jeong Yeol Moon,Jeong Gyu Yang,Sung Hoon Park,Jin Kook Lee ) 한국공업화학회 1996 공업화학 Vol.7 No.1
본 연구는 이산화탄소와 phenyl glycidyl ether(PGE)의 부가반응에 대하여 상이동 촉매의 특성을 고찰한 것이다. 4급 암모늄염 상이동 촉매의 경우 알킬기의 크기가 크고 짝이온의 친수성이 강할수록 좋은 촉매활성을 나타내었다. 폴리에틸렌글리콜과 crown ether도 NaI와 함께 사용한 결과 효율적인 촉매임을 알 수 있었다. 이산화탄소의 압력이 증가하면 용매인 NMP에 대한 CO₂의 용해도가 증가하여 PGE의 전화율이 증가하였다. 또한 상이동 촉매의 역할이 포함된 반응메카니즘을 제시하였다. This study is related to the investigation of the characteristics of phase transfer catalysts on the addition reaction of carbon dioxide and phenyl glycidyl ether(PGE). Quaternary ammonium salts showed a good conversion of PGE at 1atm of CO₂. Among the quaternary ammonium salts tested, the ones with higher alkyl chain length and with more hydrophilic counter anion showed higher catalytic activity. Polyethylene glycol and crown ether were also effective catalysts when they are used with NaI. High pressure of CO₂ increased the conversion of PGE by increasing solubility of CO₂ in NMP. A mechanism of the reaction involving the role of phase transfer catalyst was also proposed.