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황병현,김기택,Hwang, Byunghyun,Kim, Ketack 한국전기화학회 2013 한국전기화학회지 Vol.16 No.3
Redox flow batteries are attractive energy-storage devices for renewable energy and peak-power energy control. Even though some prototypes are available already, many new materials are under development for new battery systems. In this reports, redox pairs and theirs properties are explained, by which one can understand issues with redox pairs, such as contaminations, cross-over, ionic selectivity, and solubility. Batteries that have the same redox pairs in both electrode compartments can be operated longer than those with different redox pairs due to the prevention form the cross-contamination. There are undivided redox flow batteries that have no membrane, which is another direction improving cycle life of the batteries.
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폼과 폴리머를 활용한 EPB 쉴드 TBM 굴착토의 유동학적 특성 평가
황병현,강민규,권기범,양정훈,최항석 사단법인 한국터널지하공간학회 2023 한국터널지하공간학회논문집 Vol.25 No.5
The Earth Pressure Balanced (EPB) Shield Tunnel Boring Machine (TBM) is widely employed for constructing urban underground spaces due to its minimal vibration and low noise levels. The injection of additives offers several advantages, including maintaining shield chamber pressure, reducing shear strength, minimizing cutter wear, and decreasing the permeability of the excavated soil. This technique is known as soil conditioning and involves the application of additives such as foam, polymer, and bentonite slurry. In this study, weathered granite soil commonly encountered at domestic tunnel sites was used as a soil specimen. Foam and polymer were applied as additives to assess the rheological properties of conditioned soils. The workability was evaluated through slump tests, while the rheological properties were assessed through laboratory pressurized vane shear tests conducted under the same conditions. Specially, the polymer was applied under specific conditions with low workability with high slump values, with the aim of evaluating the impact of polymer application. The test results revealed that with an increase in the Foam Injection Ratio (FIR), the slump value also increased, while the torque, peak strength, yield stress, apparent viscosity, and thixotropic area decreased. Conversely, an increase in the Polymer Injection Ratio (PIR) led to results opposite to those of FIR. Additionally, a correlation between the slump value and yield stress was proposed. When comparing conditions with only foam applied to those with both foam and polymer applied, even with similar slump values, the yield stress was found to be lower in the latter conditions.
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터널 강관 보강형 다단 그라우팅의 Seal재 배합비에 대한 연구
황병현,김연덕,심재훈,김상환 사단법인 한국터널지하공간학회 2020 한국터널지하공간학회논문집 Vol.22 No.4
This paper presents the seal material mixing ratio of tunnel umbrella arch reinforcementmethod. Currently, there is no clear standard for the proper gelation time and curingtime of the Seal material in Korea, and the quality control is also difficult because itcannot be verified. In response, the ratio of the mixture of the seal material wascomposed of four types of indoor experiments, and the amount of gelation time andbleed was checked. In addition, a non-cart penetration test confirmed the curing timeand compared the ratio of each combination. Further experiments on W/C 120%identified the effect of mixing speed and time on the seal material. A total of three fieldexperiments were conducted based on indoor experiments, and the size and strength ofbulb formation were compared by checking the curing time of the specimen and maininjection. Comparisons show that the lower W/C, the stronger the strength, the largerthe size of the bulb, and the faster the hardening time appears. Based on the results ofthe gelation time and curing time, it was deemed that the mixing ratio of W/C 120%is most appropriate when applied to the actual site. 본 연구는 강관다단 그라우팅 공법의 Seal재의 배합비 결과에 대한 연구이다. 현재 국내에는 Seal재의 적정 겔화시간 및 초결시간에 대한 명확한 기준이 없는 실정이며, 이를 확인할 수 없어 품질관리에도 어려움이 있다. 이에 Seal재의 배합비를 4가지로 구성하여 실내 실험을 진행하였으며, 이를 통해 겔화시간 및 블리딩양을 확인하였다. 또한 비카트침 관입 실험을 통해 초결시간을 확인하고 각 배합비의 비교를진행하였다. 그리고 W/C 120%에 대한 추가적인 실험을 통해 교반 속도와 시간이 Seal재에 미치는 영향을 파악하였다. 실내실험을 기반으로 총 3가지의 배합비에 대한 현장 실험을 진행하였으며, 시료의 초결시간 확인 및 본주입을 통한 구근 형성 크기와 강도를 비교하였다. 비교 결과 W/C가 낮을수록 강도가 강하고 구근의 크기가 크며, 초결 시간이 빠르게나타나는 결과를 확인하였다. 겔화시간과 초결시간 결과를 통해 실제 현장에 적용 시 W/C 120%의 배합비가 가장 적절할것으로 나타났다.
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황병현,구재훈,조찬우,신희철,송범석,이성주 대한산업공학회 2009 대한산업공학회 추계학술대회논문집 Vol.2009 No.10
최근 지식경제 사회의 대두와 개방형 혁신을 화두로 기술평가에 대한 니즈가 높아지고 있으며, 이에 다양한 기술평가 모형이 제안되고 있다. 그러나 기존의 기술 평가 모형들은 정성적 요인만을 고려하거나 정량적 요인만을 고려하여 기술을 평가하였기 때문에, 제공하는 정보와 평가결과에 한계가 있다. 이를 극복하고자 본 연구에서는 정성적 요인과 정량적 요인을 동시에 고려할 수 있는 평가 모형을 제안하고자 한다. 제안 모형은 입지선정 모형 가운데 하나인 브라운 깁슨(Brown-Gibson) 모형을 기반으로 개발되었으며, 브라운 깁슨 모형식의 특징인 각 요인의 가중치 부여를 본 기술 평가 모형에 적용하였다. 따라서 정성적 요인과 정량적 요인 값의 합리적인 설정을 위한 평가 지표를 제안 하였으며, 사례 연구를 통해 제안모형의 타당성을 검증하였다. 연구결과는 전문가 의견 등의 정량적 요인과 특허분석 등의 정성적 요인을 복합적으로 고려해야 하는 상황에서 유용하게 활용되며, 향후 기술 거래, 기술 가치 평가, 기업평가 등을 위한 기초자료로 활용될 수 있을 것으로 기대된다.
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Shield TBM 챔버 내 mixing bar 교반 효율에 대한 기본연구
황병현,김상환,이경헌,안준규,조성우,김연덕,Hwang, Beoung-Hyeon,Kim, Sang-Hwan,Lee, Kyung-Heon,An, Jun-Kyu,Cho, Sung-Woo,Kim, Yeon-Deok 한국터널지하공간학회 2020 한국터널지하공간학회논문집 Vol.22 No.1
This study is the basic study for improving the range of influence and potency of mixing bars in the chamber of Shield TBM. Currently, there are many studies on disk cutters, cutter bits and segments in the study of the domestic Shield TBM. However, studies that mix soil and rocks that come from the membrane during the Shield TBM excavation and scatter them with screw conveyors are not as good as those abroad. In this study, the existing Shield TBM Chamber was manufactured as a miniature and the experiment. Inside the chamber, different sizes (4 mm, 6 mm, 8 mm, 10 mm) and colors (black, white, red, and blue) were used to form layers. This experiment was carried out by different shapes and sizes of RPM and mixing bars. In addition, the difference between a miniature model and a reclining one was checked to determine the effect of the direction of gravity on the mixing efficiency. This was done in the same way for all other conditions other than differences in the direction of gravity. Through this experiment, we identified the orientation of the chamber model, the size and shape of the mixing bar inside, and the mixing effect and torque depending on RPM. A comparative review of the mixing effect and torque confirmed that the shape and size of the mixing bar affect the mixing of samples, and that the direction of gravity affects torque.
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YOLO 모델별 독성 해양 생물 탐지 성능 비교 및 스마트 수산 기술 적용 가능성 탐색
황병현,노미진 (사)한국스마트미디어학회 2024 스마트미디어저널 Vol.13 No.11
The rise in sea temperatures due to global warming has accelerated the migration of marine species, leading to the frequent discovery of toxic marine organisms in domestic waters. The blue-ringed octopus in particular is very dangerous because it contains a deadly poison called tetrodotoxin. Therefore, early detection of these toxic species and minimizing the risk to human life is crucial. This study evaluates the effectiveness of using the latest object detection technology, the YOLO model, to detect toxic marine species, aiming to provide valuable information for the development of a smart fisheries system. The analysis results showed that YOLOv8 achieved the highest precision at 0.989, followed by YOLOv7 at 0.775 and YOLOv5m at 0.318. In terms of recall, YOLOv8 scored 0.969, YOLOv5l scored 0.845, and YOLOv7 scored 0.783. For mAP50 and mAP50-95 metrics, YOLOv8 also performed the best with scores of 0.978 and 0.834, respectively. Overall, YOLOv8 demonstrated the highest performance, indicating its strong suitability for real-time detection of toxic marine organisms. On the other hand, the YOLOv5 series showed lower performance, revealing limitations in detection under complex conditions. These findings suggest that the use of the latest YOLO model is essential for establishing an early warning system for toxic marine species.
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