자동차 엔진마운트의 온도에 따른 동특성 변화 해석

황인성(Inseong Hwang),이두호(Dooho Lee) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10

박사학위 논문초록

황인성(Inseong Hwang) 대한전자공학회 2015 전자공학회지 Vol.42 No.6

McSimA+ 시뮬레이터를 사용한 Vision Transformer 추론 과정의 레이어 별 Memory Bottleneck 분석

황인성(Inseong Hwang),장지훈(Jihoon Jang),신진(Shin Jin),김현(Hyun Kim) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

As deep learning models continue to grow in scale, the number of parameters in these models has increased, causing a significant memory bottleneck in conventional von Neumann architecture-based systems. To address this issue, a new memory technology such as Processing-In-Memory (PIM) is being developed, and its importance is also steadily being emphasized. However, since PIM designs additional logic to the existing memory structure, an in-depth analysis of the workload suitable for PIM is required in advance to prevent unnecessary overhead in the design process. In this paper, in order to verify the suitability of the recently popular Vision in Transformer (ViT) model for PIM, we build a deep learning model analysis environment using McSimA+ simulator and analyze the memory bottleneck of the ViT inference workload by layer. The analysis results show that the ViT is a very memory-intensive workload because Last-to-First Miss Ratio (LFMR) and Last Level Cache Miss Per Kilo Instruction (LLC MPKI) of the ViT, which are composed of embedding, multi-head self attention, and multi-layer perceptron layers, are 88.64 and 45.31, respectively, on average. As a result, the ViT is an appropriate workload to achieve significant system acceleration and power savings through PIM systems, unlike computationally intensive convolution neural networks (CNNs).

산화-환원 연계 원위치 오염정화기술 개발

황인성(Inseong Hwang),Nguyen quoc bien(Nguyen Quoc Bien),정혁성(Hyuk Sung Chung),최재영(Jae Young Choi) 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11

의류 검색용 회전 및 스케일 불변 이미지 분류 및 검색 기술

황인성(Inseong Hwang),조법근(Beobkeun Cho),전승우(Seungwoo Jeon),최윤식(Yunsik Choe) 한국방송·미디어공학회 2014 방송공학회논문지 Vol.19 No.3

환원-산화 연계처리를 통한 니트로벤젠의 반응성 향상 및 무해화 연구

권희원,황인성,김영훈,Kwon, Hee-Won,Hwang, Inseong,Kim, Young-Hun 한국환경과학회 2020 한국환경과학회지 Vol.29 No.12

In this study, the applicability of reduction-oxidation-linked treatment was evaluated for nitrobenzene and a by-product by analyzing the reaction kinetics. Nitrobenzene showed very low reactivity to persulfate that was activated using various methods. Nitrobenzene effectively reacted through the reduction process using Zero-Valent Iron (ZVI). However, aniline, a toxic substance, was produced as a by-product. Reduction-oxidation-linked treatment is a method that can allow the oxidative degradation of aniline after reducing nitrobenzene to aniline. The experimental results show improved reactivity and complete decomposition of the by-product. Improved reactivity and decomposition of the by-product were observed even under conditions in which the reduction-oxidation reaction was induced simultaneously. No activator was injected for persulfate activation in the process of reducing oxidant linkage, and the activation reaction was induced by ferrous iron eluted from the ZVI. This indicates that this method can be implemented relatively simply.

제강슬래그의 친환경적 매체접촉형 재활용 방안: 용출시험 및 국내외 재활용 지침 비교

김동현,황인성,신원식,Donghyun Kim,Inseong Hwang,Won Sik Shin 한국지하수토양환경학회 2024 지하수토양환경 Vol.29 No.1

Slags from steel-making industry have been recycled at a target rate of 95% and most of them are recycled as media-contact type such as fill and cover materials in Korea. However, as they contain free phase CaO during their generation, they may not only expand and collapse upon contact with water, but high pH leachate and heavy metals leaching may occur. In this study, the Korean leaching procedure (KLP) and up-flow percolation test were performed for the samples collected from 17 steel-making production plants in Korea. The waste quality criteria were met in all tests, but pH of the samples was above 10. There are no regulations on the pH of leachate in most of the countries, however, Germany, Italy, and Australia have set a pH range of 10 to 13 for the leachates. Although slag leachate cannot be considered hazardous based only on its high pH, it is necessary to reduce the pH of leachate to minimize the impact on the surrounding environment. Furthermore, conflicting regulations on wastes handling and management in Korea created confusion on the types of wastes subject to recycling. Therefore, an appropriate management plan for steel-making slags needs to be established. To this end, this study attempted to provide a guideline for managing steel-making slag waste by considering international guidelines and current management practices in Korea.

Cold Mix Asphalt로 처리한 디젤 오염 토양의 흡착 및 용출특성

서진권,황인성,박주양,Seo Jin-Kwon,Hwang Inseong,Park Joo-Yang 한국지하수토양환경학회 2004 지하수토양환경 Vol.9 No.4

유류오염토양을 건설재료로 재활용할 수 있는 방안으로써 Cold Mix Asphalt(CMA) 처리를 제시하였고 디젤 및 디젤화합물로 오염된 토양의 CMA 처리특성을 고찰하였다. 양이온성 또는 음이온성 또는 비이온성 계면활성제를 함유하고 있는 5가지 아스팔트 이멀젼을 이용해서 디젤 오염토양의 처리능을 고찰한 결과 첨가된 계면활성제의 차이에 의한 성능의 차이는 확연하게 드러나지 않았으나, 토양과의 친밀성 및 흡착계수를 고려하여 Lauryl Dimethyl Benzyl Ammonium Chloride (LDBAC)를 포함한 이멀젼을 오염토양 처리에 적합한 아스팔트 이멀젼으로 선정하였다. 아스팔트 이멀젼 LDBAC에 의한 세가지 디젤화합물의 처리능은 docosane, pentadecane, undecane의 순으로 높은 것으로 나타났다. 아스팔트 이멀젼 LDBAC를 이용하여 CMA처리된 토양에 대한 용출실험결과 비교적 고농도인 10,000 mg/kg 의 디젤로 오염된 토양도 CMA처리 가능함을 확인하였다. 공시체로부터 디젤의 용출은 초기 4일까지는 확산에 의한 거동을 보여 주었고 그 이후로는 용출속도가 감소하여 총 용출가능양의 $50\%$ 이상이 유출되었다고 판단되는 depletion의 거동을 보여 주었다. CMA처리된 오염토양으로부터 3가지 디젤화합물의 총용출량은 undecane > pentadecane > docosane의 순서로 높은 것으로 나타났으며, pentadecane의 경우 CMA 처리시 양생속도가 상대적으로 더딘 것으로 밝혀졌다. A cold mix asphalt (CMA) treatment process was proposed as a tool to recycle soils contaminated with petroleum hydrocarbons. Experimental studies were conducted to characterize performances of the CMA process in treating soils contaminated with diesel or diesel compounds. From the screening experiments, it was found that performances of five types of asphalt emulsions that contained a cationic or an anionic or a nonionic surfactant were not substantially different. In consideration of higher affinity for soils and higher sorption coefficients obtained, an emulsion containing Lauryl Dimethyl Benzyl Ammonium Chloride (LDBAC) was selected as a promising asphalt emulsion for treating diesel-contaminated soils. When the asphalt emulsion LDBAC was applied to treat three compounds that originated from diesel, the removal efficiencies obtained in the order of decreasing efficiencies were as follows: docosane > pentadecane > undecane. Leaching experiments on the specimen formulated by the emulsion LDBAC found that the selected treatment method could treat soils with diesel concentrations as high as 10,000 mg/kg. Leaching of the diesel from the specimen was controlled by diffusion for the first four days and then leaching rate diminished substantially. The latter behavior was characterized as depletion, which represents that the contaminant released amounts to more than $50\%$ of the total amount of the contaminant that can be leached. The amounts of three diesel compounds leached from the specimen in the order of decreasing amount were undecane, pentadecane, and docosane. The curing of the soil contaminated with pentadecane was relatively slow.

열적활성화된 과황산에 의한 염화페놀의 산화분해특성 연구

손지민,권희원,황인성,김정진,김영훈,Son, JiMin,Kwon, Hee-Won,Hwang, Inseong,Kim, Jeong-Jin,Kim, Young-Hun 한국환경과학회 2020 한국환경과학회지 Vol.29 No.1

Oxidative degradation of phenol, three monochlorophenols (2-chlorophenol, 2-CP; 3-chlorophenol, 3-CP; 4-chlorophenol, 4-CP), four dichlorophenols (2,3-dichlorophenol, 2,3-DCP; 2,4-dichlorophenol, 2,4-DCP; 2,5-dichlorophenol, 2,5-DCP; 2,6-dichlorophenol, 2,6-DCP), and two trichlorophenols (2,4,5-trichlorophenol, 2,4,5-TCP; 2,4,6-trichlorophenol, 2,4,6-TCP) was conducted with heat activated persulfate. As the number of chlorinations increased, the reaction rate also increased. The reaction rate was relatively well fitted to the zero-order kinetic model, rather than the pseudo-first order kinetic model for the reactions at 60 ℃, which can be explained by insufficient activation of the persulfate at 60 ℃, and the oxidation reaction of 2,4,6-TCP at 70 ℃ was relatively well fitted to the pseudo-first order kinetic model. The oxidation reaction rate generally increased with increase of persulfate concentration in the solution. 2,6-dichloro-2,5-cyclohexadiene-1,4-dione was found as a degradation product in a GC/MS analysis. This compound is a non-aromatic compound, and one chlorine was removed. This result is similar to the result of previous studies. The current study proved that heat activated persulfate activation could be an alternative remediation technology for phenol and chlorophenols in soil and groundwater.

Fe(II)에 의해 활성화된 과황산을 이용한 페놀 오염 퇴적물 처리 타당성 평가

조재현,윤성은,김재문,황인성,Jo, Jae Hyun,Yoon, Seong-Eun,Kim, Jae-Moon,Hwang, Inseong 한국지하수토양환경학회 2020 지하수토양환경 Vol.25 No.4

Persulfate-based advanced oxidation processes (AOPs) can oxidize various organic pollutants. In this study, persulfate/Fe(II) system was utilized in phenol removal, and the effect of various organic and inorganic chelators on Fe(II)-medicated persulfate activation was investigated. The feasibility of persulfate/Fe(II)/chelator in cleanup of phenol-contaminated sediment was confirmed through toxicity assessment. In persulfate/Fe(II) conditions, the rate and extent of phenol removal increased in proportion to persulfate concentration. In chelator injection condition, the rate of phenol removal was inversely proportional to chelator concentration when it was injected above optimum ratio. Thiosulfate showed greater chelation tendency with persulfate than citrate and interfered with persulfate access to Fe(II), making the latter a more suitable chelator for enhancing persulfate activation. In contaminated clay sediment condition, 100% phenol removal was obtained within an hour without chelator, with the removal rate increased up to four times as compared to the rate with chelator addition. A clay sediment toxicity assessment at persulfate:Fe(II):phenol 20:10:1 ratio indicated 71.3% toxicity reduction with 100% phenol removal efficiency. Therefore, persulfate/Fe(II) system demonstrated its potential utility in toxicity reduction and cleanup of organic contaminants in sediments.