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FRP 스트럿을 가진 PSC 박스거더교의 구조안전성 평가를 위한 실험 연구
송재준,박종화,박경훈,조병완 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 논문집 Vol.12 No.6
FRP 스트럿을 가진 PSC 박스거더 교량 구조는 기존의 PSC 박스거더를 효율적으로 변형시켜 넓어진 상부 슬래브의 캔틸레버 부분을 스트럿으로 지지하는 구조형식으로, 상부구조의 자중을 줄여 하부구조의 크기를 경감시키므로 경제적이고 미관이 뛰어난 교량 건설을 가능하게 한다. 본 연구에서는 국내에서 처음 시도되는 FRP 스트럿을 가진 PSC 박스거더의 실물모형 재하실험과 유한요소해석을 수행하여 상호 결과를 비교함으로써 FRP 스트럿을 가진 PSC 박스거더 교량 구조에서 FRP 스트럿과 스트럿 적용에 따른 상부 슬래브의 구조적 안전성에 대하여 평가하였다. The structure of PSC box girder with FRP strut has a form of supporting the cantilever part in the widened upper slab by modifying the existing PSC box girder efficiently, and it is able to build an economical and aesthetically pleasing bridge as it reduces the size of the lower structure by reducing the self-weight of the upper structure. In this research, loading test of PSC Box Girder using full-scale mock-up was conducted and FEM analysis was performed. By comparing results, structural safety of the FRP strut and the upper slab following application of the strut in the PSC Box Girder Bridge were evaluated.
宋在峻 木浦大學校 沿岸環境硏究所 1994 沿岸環境硏究 Vol.11 No.1
This paper was concentrated on estimating the possibility of application of biological fluidized bed to the low concentrated wastewater treatment and reuse. This study were conducted by continuous type rectors at HRT 1hr, 2hr, 3hr and F/M ratio from 0.2 to 0.4/day. The results obtained were as follows. 1. As a results of the treatment of the low concentrated wastewater of influent BOD 70-94㎎/l, BOD removal ratios coulde be reached to 94% at HRT 1hr. 2. Treatment efficiency by BFB of low concentrated wastewater was nearly same even if in case of F/M ratio variation of 0.2 to 0.4 regardless of F/M ratio. 3. As a prevent to anaerobic state and increased oxygen transfer rate, the air lift pump is effiency. 4. A results of the treatment of the low concentrated wastewater by BFB is that the industrial water is the first class and the drinking water is the third class, therefore, it could be reuse.
음식물류폐기물 건조 공정에서 발생하는 건조응축수의 생물학적처리 운영 조건 도출 연구
송재준,정진도 한국폐기물자원순환학회 2022 한국폐기물자원순환학회지 Vol.39 No.3
This study was conducted to derive operating conditions for biological wastewater treatment targeting high- concentration dry condensate generated in the drying process of food waste. In the biological treatment of dry condensate, lab. scale (40 L/d) bioreactor was manufactured and used in the study to evaluate the water quality of the treated water according to the change in operating conditions and to derive stable operating factors. Changes in the influencing factors inside the aeration tank according to the change of BOD load, hydraulic retention time (HRT) and F/M ratio were observed during the operation of the lab. scale bioreaction process. Thereafter, the treatment efficiency was evaluated by measuring the water quality concentration of the treated water. As a result of the study, the water quality of the treated water was BOD 71.14 ± 10.19 mg/L, TOC 49.54 ± 9.64 mg/L, T-N 33.78 ± 5.00 mg/L, T-P 3.35 ± 1.24 mg/L was evaluated as the highest treatment efficiency, under the HRT 5 day, BOD Load 0.30 ± 0.02 kg BOD/d, F/M ratio 0.40 ± 0.02 kg BOD/kg MLSS/d operating condition. It is concluded that the results of this study can be used as data for ensuring stable treated water quality and complying with the emission standards at real plant.
宋在峻,李喜寶 전북대학교 공업기술연구소 1992 工學硏究 Vol.23 No.-
The most cities of Korea today are being confronted with many problems because of the waste disposals and treatments. Particulary, the unsuitable substances for incineration, such as the incombustibles, the refuse ashes of the incinerators, and the various kinds of plastics, have been the main cause of these problems. The cities not densely populated like Seoul and Busan, but also other cities which are not only densely populated have troubles in finding the locations for the waste disposal sites from the point of view of protecting citizens' health and environmental hygiene. Researchers have visited Osaka Hokko (north port) waste disposal site located in the Port of Osaka. As a part of Hokko Island Project planned by the Port and Harbor Bureau, Osaka City, this waste disposal site has been constructed. As a resolving strategy of the above mentioned problems, researchers had studied by inspection of the waste disposal site. They thought it would be a favorable method in the waste disposal and they wish such disposl sites shall be constructed in the near future, in our country.