바인더 및 색소에 따른 이산화티타늄의 NO 제거효율 변화

백효선(Hyo-Seon Baek),박정환(Jeong-hwan Park),승인배(In-Bae Seung) 대한환경공학회 2019 대한환경공학회지 Vol.41 No.2

미세먼지는 인체에 해로운 영향을 주고 있어 사회적으로 이에 대한 저감 필요성 및 요구가 증가하고 있으나 대부분의 대책이 규제를 통한 발생원 차단에 중점을 두고 있어 저감에는 한계가 있다. 이에 본 연구는 규제가 아닌 원인물질을 제거할 수 있는 기술을 개발하고자 미세먼지를 유발하는 질산이온(NO₃<SUP>-</SUP>)이 2차 생성을 통해 미세먼지로 전환되지 않도록 광촉매를 이용한 처리 기술 개발에 관한 연구이다. 기술 개발을 위하여 바인더 종류, 시공방법, 색소에 대한 NO 제거율 변화에 대한 실험을 실시하였으며 바인더로 천연시멘트와 백시멘트를 이용하고 시공방법으로는 타설과 뿜칠을 비교하였으며 색소로는 녹색, 적색, 흑색에 대한 제거율 변화를 관찰하였다. 실험결과 천연시멘트가 백시멘트에 비하여 NO제거율이 56~67% 수준임을 확인하였고 시공방법에 대한 실험을 통해 진동의 영향을 받은 타설 방법보다 진동영향이 없는 뿜칠이 2배 이상 제거율이 향상됨을 확인할 수 있었으며 색소에 대한 영향은 녹색이 바인더 및 시공방법에 관계없이 적색, 흑색보다 제거율이 낮게 형성됨을 확인 할 수 있었다. The reduction is limited because most of the measures focus on blocking the source through regulation. Therefore, this study is a study on the development of treatment technology using Photocatalytic so as to prevent the conversion of Nitrogen ion causing fine dust into fine dust through secondary generation in order to develop a technology that can remove the causative substance. For the development of the technology, experiments were carried out on the change of NO removal rate to binder type, construction method and pigment. Natural cement and white cement were used as binders. The method of construction was compared with concrete placement and spraying. The removal rates of green, red and black pigments were observed. Experimental results show that the removal rate of natural cement is higher than that of white cement by 56~67%. Experiments on the construction method show that the removal efficiency of the spraying without vibration is more than 2 times higher than that of the concrete placement method. The effect of the pigments on the pigments was found to be lower than that of red and black irrespective of binder and construction method.

표면 마감 광촉매 스프레이 모르타르의 리바운드량 저감 방안 연구

백효선(Hyo-Seon Baek),박정환(Jeong-Hwan Park) 한국산학기술학회 2020 한국산학기술학회논문지 Vol.21 No.9

콘크리트 표면 마감에는 다양한 방법이 있으며, 시공성을 고려할 때 스프레이 방법이 효과적이나 리바운드 발생현상이 발생한다. 통상 숏크리트의 손실률은 30-45%가량 보고되고 있으며, 이로 인하여 작업 효율 저하 및 공사비 상승등의 문제를 발생시킨다. 이를 해결하고자 다양한 선행 연구가 진행되었으며 리바운드량을 저감하기 위해서는 사용재료에 따라 리바운드 발생 억제를 위해 배합을 조정하여야 하며 본 연구에서는 광촉매가 포함된 표면 마감재료에 적합한 리바운드 발생량 저감 목적의 배합 기술에 대한 기초 연구를 진행하였다. 본 연구의 선행연구로는 광촉매 성능에 대해 저감효과 및 최적 혼합 비율을 도출하였고, 선행연구를 바탕으로 규사 함량에 따른 리바운드 저감 및 혼화 재료 별 역학적 내구 특성 검증을 진행하였다. 시험 방법으로는 리바운드, 압축강도, 휨강도, 테이블 플로 시험으로 진행하였고, 모르타르 스프레이 장비의 작업성을 고려하였을 때 Flow 170±10mm로 고정하였다. 실험 변수로는 시멘트 중량 대비 규사변수로 맞추어 리바운드량 측정을 하였고 규사는 5호, 7호 규사를 사용하였다. 실험 결과 최종 S-1 변수에서 가장 높은 압축강도를 나타냈고 리바운드 양을 최소화할 수 있었다. 이러한 결과는 규사 공극의 결합재가 충분히 충진하게 되어 골재 사이의 결합력이 증가되므로 낮은 리바운드 양을 확보할 수 있었다. There are various methods of finishing concrete surfaces, and when considering workability, the spray method is effective, but rebound occurs. The allocation of rebound occurrence control should be adjusted according to the materials used. Thus, a basic study was conducted on multiple techniques for reducing the rebound incidence that are suitable for surface finishing materials containing a photocatalyst. A prior study derived the reduction effect and optimal mix ratio for photocatalytic performance. Based on that study, the rebound reduction was verified according to the specifications of the content and the mechanical durability characteristics of the mixed materials. Rebound, compressive strength, flexural rigidity, and table flow tests were done. The flow was fixed at 170±10 mm considering the workability of the mortar spray equipment. For the experimental variables, the rebound number was adjusted to the silica sand variables relative to the cement weight, and silica sands No. 5 and No. 7 were used. The results show the highest compression strength in the final S-1 variable, and the amount of rebound was minimized. These results were sufficiently filled with the bindings of the silica pores, which increased the binding force between the aggregates, resulting in a lower amount of rebound.

XP-SWMM에 의한 관로해석과 수리모형실험비교

백효선(Beak Hyo-Seon),강영복(Gang Young-Bok),최순규(Choi Soon-Kuy),최한규(Choi Han-Kuy) 대한토목학회 2005 대한토목학회 학술대회 Vol.2005 No.10

수리모형과 수치해석을 통한 하천폭의 국부적 축소 및 확대에 따른 수리특성 연구

백효선(Beak Hyo-Sun),김주석(Kim Ju-Suk),백경원(Beak Kyung-Won),최한규(Choi Han-Kuy) 대한토목학회 2007 대한토목학회 학술대회 Vol.2007 No.10

댐 하류 만곡부 하천에 대한 수리학적 특성 연구

최한규,백효선,이계윤 江原大學校 産業技術硏究所 2005 産業技術硏究 Vol.25 No.A

In order to accurately analyze the detailed hydraulic characteristics of the curved channel in the downstream of dam with the hydraulic structures such as bridge piers, RMA2 model which is one of two-dimensional models is applied to ChunCheon dam downstream curved channel. A series of hydraulic model tests are carried out for comparison studies. HEC-RAS model is also applied to the same site. There are no errors when velocities and water levels resulted from HEC-RAS model RMA2 model are compared with those of hydraulic model test on the straight channel. But, it is found that results of RMA2 model have a better agreement with those of hydraulic model test than those of HEC-RAS model on the curved channel with bridge piers. Additionally, RMA2 model can be predicted the eddy phenomena around bridge piers of the curved channel.

기존 세굴심 산정공식 적용을 위한 모형실험과의 비교 연구

최한규,백효선,정창동 江原大學校 産業技術硏究所 2004 産業技術硏究 Vol.24 No.B

The existing of developed scour Equation have a very different value by boundary condition, hydraulic condition and bed condition. Therefore it may give rise to a serious trouble if it make a wrong application of the scour Equation. So this research of purpose is the predicting of scour depths, the method is that analysis river of feature and hydrauric feature for river in kangwondo young-seo region. And hydrauric model experiment of Scour phenomenon execute after the existing of calculate scour depths equation analysis sensitivity, assort a practical.

내린천 유역의 HEC-HMS 모형 적용에 관한 연구

최한규,백효선,정병하 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

HEC-HMS model should be calibrated to be applied to these basins in Gangwon-do unlike the general basins. In the study, it is investigated whether the HEC-HMS model may be applied or not to Naerinchon basin where is the typical basin of Gangwon-do Additionally, the straightforword module of HEC-HMS for simulating the hydrologic characteristic of Gangwon-do basins well will be suggested by comparison of the numerical results with the observed data. The hydrologic results estimated by several modules such as Clark, SCS and Snyder methods in HEC-HMS model have been compared with the observed data for 1999~2000 storm events. It is concluded that Clark method are relatively applicable to the basins in Gangwon-do rather than the others methods. The parametric studies for HEC-HMS model should be studied further in order to apply to Gangwon-do basins more accurately.

雨水管路 滿水時 水理學的擧動에 대한 XP-SWMM와 水理模型實驗의 比較 硏究

최한규,백효선,백두열 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

To use land more efficiently under urbanization trend, Kangwon Province often covers open channels of creeks and uses them as parking lots or roads. A covered open channel section tends to form a rectangular culvert. Therefore, a creek with covered open channels can function as a storm drain. At the time of light rainfall, there are no significant differences except water flowing pattern between a creek with a covered open channel and a creek without it. Recently, however, the frequent occurrence of heavy rainfalls limited at a small, definite area has become problematic. When the heavy rainfall causes the carrying capacity of a creek to be exceeded, the creek with covered open channel has a more serious problem than the creek without it has. Therefore, we made an interpretation of data and conducted hydraulic model experiment to come up with economical solution to this problem.

분수로 분류부 형상에 따른 유량분배율 특성의 실험적 연구

최한규,백효선,이석환 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

The divided channel is not often used on the river and when the installation is for the controlling of the flow quantity. The determination of the channel size is not a easy task. Model tests are examined to confirm the variation of distribution rate by the method of the channel installation and the position of the structure and the adjustment of numerical simulation is executed by the comparing of the results. This study is to execute numerical model according to installation of divided channel by using AQUADYN program, the 2nd dimension numerical model, and HEC-RAS program, the 1st dimension numerical model, by the shape of divided channel. Also, it compares with difference by method about each case.

건설용 3D 프린팅 기술의 해외 사례 조사 및 국내 상용화 방안

승인배,백효선,박정환 한국산업융합학회 2018 한국산업융합학회 논문집 Vol.21 No.6

3D printing technology in the construction field is currently being developed and commercialized actively in foreign countries, but the development of material and equipment is underway as an initial research stage in Korea. It is necessary to implement commercialization through the introduction of 3D printing technology in the construction field as soon as possible in Korea, but there is no guideline for suitable equipment and materials in Korea at present. Therefore, in order to help prepare for commercialization, it is necessary to provide data such as equipment size and materials suitable for commercialization at the initial stage. This study investigates the types, specifications, and applications of equipment that are being used overseas to provide the equipment type and material cost required in the initial stage of commercialization in Korea. Using the surveyed data, it was possible to calculate the advantages and disadvantages of the equipment type and specification, and the cost of materials used. As a result of the analysis, Gantry type is suitable for the domestic commercialization, and the standard of the output area is 100m² and the extrusion amount of 250m³ / sec is proposed, and the material cost of the commercial product is 20thousand won. The suggestions in this study will help to plan the construction of products and equipments to commercialize 3D printing technology in construction field in the future.