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상속 소프트웨어 시스템을 CORBA 환경에서 재사용하기 위한 객체 포장 기법의 설계 및 구현
황규대(Gyu Dae Hwang),김현수(Hyeon Soo Kim) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅰ
상속(Legacy) 소프트웨어 시스템은 오랜 기간 사용되었고 충분히 검증된 안정적인 서비스를 현재까지도 제공하는 유용한 시스템이다. 새로운 분산 객체 환경에서 기존의 시스템에서 제공하는 서비스를 사용하기 위한 방법으로, 기존 시스템을 대체할 새로운 시스템을 개발하는 방법과 기존 시스템의 코드를 수정하는 방법과 기존 시스템을 객체 포장기법으로 포장해서 사용하는 방법이 있다. 본 논문은 이 중에서 기존 시스템을 객체로 포장하여 분산 객체 기술인 CORBA 환경에서 이 시스템을 재사용 하는 방법에 대하여 연구한다. 이 과정에서 다양한 형태의 인터페이스를 가진 기존 시스템을 효과적으로 포장할 수 있는 방법으로 LWR(Legacy Wrapping Rule)을 제안하고, 랩퍼(Wrapper)인 구현 객체 클래스를 만드는 랩퍼 생성기를 구현하였다. 이렇게 함으로써 상속 시스템을 보다 쉽고 강력하게 분산 환경으로 이주시킬 수 있다.
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생슬러지의 초음파 조사에 의한 BNR공정의 탄소원 타당성 연구
황규대 ( Hwang Gyu Dae ),강재순 ( Kang Jae Sun ),장준기 ( Jang Jun Gi ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5
In the sonochemical reaction, the solid of sludge can be disintegrated and solubilized by hydromechanical shear force, pyrolysis, and free radical attack during the cavitation. This study was performed to evaluate the feasibility of ultrasonically treated raw sludge as carbon source for biological denitrification and phosphate release. A 530W ultrasonic processor with a frequency of 40kHz was used to sonicated the raw sludge from wastewater plant. To find the optimal SCODcr buildup condition. we examined the effects of solid concentration of sludge, ultrasonic density, irradiation time, aeration, and pH on TSS and SCODcr concentration during the ultrasonic irradiation on raw sludge. Ultrasonic irradiation was applied to raw sludges with different solid contents (1, 3, and 5%.) and different ultrasonic density (0.04, 0.06, and 0.12W/rnl). Ultrasonic irradiation showed a rapid and significant decrease in TSS concentration in raw sludge. The kinetic of the degradation rates of TSS by ultrasonic irradiation was satisfactorily described by a pseudo-first order reaction. The degradation efficiency of solid in raw sludges were over 60%, and ranged from 3.0 to 7.2 ㎎TSS/W . hr. Also the SCODcr yields of 2.1 -3.2 ㎎SCODcr/W·hr in this study were observed and depended strongly on ultrasonic density. With aeration. the sonication on raw sludge further increased SCODcr concentration. However, it is less effective to irradiate ultrasonically the pH-adiusted raw sludge. The optimal operating condition to increase soluble organics was to sonicate the sludge with 5% TSS under the ultrasonic density of 0.12W/ml and showed the yield of 3.2 ㎎SCODcr/W . hr. Also the sonicated sludges with different sonication time(ranging between 0-9hrs) under 0.I2W/ml were fed into the batch reactors as carbon source. Those ones had a strong influence on the denitrification rate and the P-release concentration. The specific denitrification rates of batch reactors varied within a range from 0.46 to 1.97 mgNO₃-N/gVSS·hr, and 1.33-1.85 gSCODCr consumed/gNO₃-N removed was observed. The concentration of phosphate which was released by poly P microbes were in the range of 0-4.75㎎/L. and 0.55-1.22gPO₄-P released /gSCODcr consumed was showed. The economically most competitive sludge as carbon source was one under 3hr sonication time to accomplish the high denitrification rate and the P-release concentration. Therefore, the ultrasonically treated sludge can be another carbon source for BNR process.
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축산폐수 전처리를 위한 암모니아 탈기공정의 운전조건이 암모니아 제거에 미치는 영향
황규대 ( Hwang Gyu Dae ),조영무 ( Jo Yeong Mu ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.1
Lab-scale experiments have been carried out to investigate ammonia stripping with a modified spray tower for removing ammonia nitrogen from swine wastewater. The operating conditions such as initial pH, temperature, air flow, hole size of distributor determining the diameter of water drops, and influent solids concentration were closely examined focusing on removal efficiency of ammonia. As a result of the experiment, in order to achieve high rate of ammonia removal by the air stripping system the air flow rate must be supplied at high rate with sufficiently high initial pH, temperature. The optimum operating condition to meet the residual ammonia concentration of 300 ㎎/L was the initial pH of 1 1.0 at 35 ℃ with the air flow rate of 20 L/min. It also showed that the smaller hole size is, the higher removal rate of ammonia is expected. However, when used a small sized distributor (2 ㎜), the flooding problem at the upper column occurred due to clogging of the hole. With regard to the influent solids concentration, it was showed that the lower concentration of solids, the higher removal rate of ammonia. The removal of particulate materials in influent led to improve the removal efficiency of ammonia, rather than to control the operating condition including initial pH, temperature, and air flow. The empirical correlation between KLa and operating parameters would be driven as, K_(La) = (0.0003 T- 0.0047)·G^(0.3926) ·L^(-0.5169)·C^(0.1849). The calculated K_(La) from proposed formula can be used effectively to estimate the optimum reaction time and to calculate the volume of modified spray tower system.
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