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Pulsed UV를 이용한 CSOs 소독시 반사체에 따른 처리효율 연구
한종훈,허지용,김강욱,이준영,박원석,이종열,허남국,Han, Jonghun,Hur, Jiyong,Kim, Kangwook,Lee, Junyoung,Park, Wonseok,Lee, Jongyeol,Her, Namguk 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.1
This study examined the disinfection in combined sewer overflows (CSOs) by pulsed ultraviolet (PUV). The reflectors (stainless steel. mirror, aluminium foil, aluminium (1050), aluminium (6061), aluminium (5052), and aluminium mirror) of PUV irradiation was performed in a 90 L stainless reactor at a constant temperature of $20^{\circ}C$ and an applied power of 4000 W. The reflection efficiency of reflectors were showed 1.00 (aluminium mirror) ~ 1.48 (aluminium foil) does. The case of a rough surface analysis using SEM showed high reflectance, was the case of a smooth surface and a low reflectivity. Pseudo first-order rate constant calculated results, has a higher reflectivity values were more than twice as high compared to the low reflectivity. Affected Total coliforms disinfection time, depending on the type of reflector is considered.
Ultrasound와 Pulsed UV 조사시 $H_{2}O_{2}$ 발생량과 보조제 주입시 bisphenol A, 17${\beta}$-estradiol의 제거에 대한 연구
한종훈,이성재,윤여민,허남국,Han, Jongh-Hun,Lee, Sung-Jae,Yoon, Yeo-Min,Her, Nam-Guk 대한상하수도학회 2012 상하수도학회지 Vol.26 No.2
This study investigated the relative degradation of commonly known endocrine-disrupting compounds such as bisphenol A (BPA) and 17${\beta}$-estradiol (E2) using ultrasound (US) and pulsed ultraviolet (PUV) in water. The removal efficiency of BPA and E2 was determined as a function of generating power and $H_{2}O_{2}$ production. The ultrasound and PUV irradiation of the aqueous solution was performed in 3 L and 90 L stainless reactor at a constant temperature of $20^{\circ}C$ with an applied power of 200 W and 2000 W, respectively. The removal of BPA and E2 by US and PUV varied with catalysts. The experiments were conducted under the following conditions: total operating time, 30 min; initial concentration, 1 uM. In the case of E2 (10 min), % removal was 92.5/95.8/87.6/82.4, while % removal of BPA (10 min) was 62.3/82.3/91.1/67.0/64.3 in various conditions (PUV, $PUV+H_2O_2$, PUV+wire mesh, $PUV+TiO_2$ coated wire mesh), respectively.
효율적인 2-Methylisoborneol, Geosmin의 제거를 위한 Pulsed UV 공정과 Ultrasound 공정의 비교 연구
한종훈,허지용,김강욱,이준영,박원석,이종열,허남국,Han, Jonghun,Hur, Jiyong,Kim, Kangwook,Lee, Junyoung,Park, Wonseok,Lee, Jongyeol,Her, Namguk 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.4
The degradation of off-flavors which is 2-Methylisoborneol (2-MIB) and geosmin by means of ultrasound (US) and pulsed ultraviolet (PUV) irradiation and its combination with catalyst (wire mesh, wire mesh coated TiO<sub>2</sub>, and TiO<sub>2</sub>) and additive (H<sub>2</sub>O<sub>2</sub>) were investigated via water system. A combination treatment of TiO<sub>2</sub> and H<sub>2</sub>O<sub>2</sub> heterogeneity with US (24 kHz) and PUV (6000 W) has shown improved results in destroying 2-MIB and geosmin, which may be attributed to chain reactions by the enhanced formation of hydroxyl radicals (·OH) through H<sub>2</sub>O<sub>2</sub> dissociation and reactive oxide ions of TiO<sub>2</sub> addition. Rapid degradation of off-flavors occurred within 2 min under PUV process with H<sub>2</sub>O<sub>2</sub> 100 mg/L (81.5% for 2- MIB; 79.3% for geosmin) and TiO<sub>2</sub> 100 mg/L (83.7% for 2-MIB; 79.8% for geosmin), while compared with H2O2 100 mg/L (58.4% for 2-MIB; 58.0% for geosmin) and TiO<sub>2</sub> 100 mg/L (59.2% for 2-MIB; 38.5% for geosmin) within 5 min under US process. Surprisingly, the emphasis was given on the comparison with the same injected energies between PUV and US on degradation efficiency. Based on the injected energy comparison, the US provided better degradation performance under equal input power of 200 kJ with H<sub>2</sub>O<sub>2</sub> 100 mg/L, while compared with H<sub>2</sub>O<sub>2</sub> 100 mg/L under PUV process. Our findings suggest that US can be more effective compared to PUV for the degradation of off-flavors in aspect of energy consumptions.
가상사설망의 성능개선을 위한 동적 키 재생성 주기 변경 알고리즘
한종훈,이정우,박성한,HAN, Jong-Hoon,LEE, Jung Woo,PARK, Sung Han 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.10
IPSec은 인터넷의 네트워크 계층의 IP 메시지를 위한 기밀성과 인증서비스를 제공하는 보안 프로토콜이다. Internet Key Exchange (IKE)는 안전하게 Security Association (SA)를 협상하고 키 재료를 제공하는 프로토콜이다. 본 논문에서는 IPSec을 적용한 가상사설망의 성능 개선을 위해 동적으로 키 재생성 주기를 변경하는 알고리즘을 제안한다. 제안하는 알고리즘은 보안 터널 수에 따라 키 재생성 주기를 변경한다. 성능 평가를 위해 Linux 2.4.18과 FreeS/WAN을 사용하여 구현한다. 구현한 시스템은 기존 프로토콜에 비하여 네트워크 처리율과 보안성 측면에서 성능이 개선됨을 보여주고 있다. Ipsec is a security protocol suite that provides encryption and authentication services for IP messages at the network layer of the internet. Internet Key Exchange (IKE) is a protocol that is used to negotiate and provide authenticated keying materials in a protected manner for Security Associations (SAs). In this paper, we propose a dynamic key lifetime change algorithm for performance enhancement of virtual private networks using IPSec. The proposed algorithm changes the key lifetime according to the number of secure tunnels. The proposed algorithm is implemented with Linux 2.4.18 and FreeS/WAN 1.99. The system employing our proposed algorithm performs better than the original version in terms of network performance and security.