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신제용(Je-Yong Shin),한욱신(Wook-Shin Han),이종학(Jonghak Lee) 한국정보과학회 2009 정보과학회 컴퓨팅의 실제 논문지 Vol.15 No.8
허밍 질의는 사용자가 가사를 모를 때, 유용하고 직관적으로 사용할 수 있는 질의 방법이다. 허밍 질의 시스템은 사용자 멜로디를 입력으로 받고, 이 멜로디를 음악 데이터베이스의 모든 멜로디와 비교하며, 가장 유사한 k개의 멜로디를 반환한다. 본 논문에서는 허밍 질의 시스템을 위한 허밍 대수를 제안하고, 허밍 대수를 이용하여 실제 허밍 질의처리 시스템인 HummingBase를 설계하고 구현하였다. 기존 유사 검색 방법들을 분석함으로써 10개의 기본 연산자로 구성된 대수를 유도하였다. 제안한 허밍 대수는 허밍 질의 시스템이 확장이 가능하고 모듈화가 되게끔 구현하는데 사용될 수 있다. 본 논문에서는 두 가지 사례 연구를 통해, 제안한 허밍 대수를 이용하면 기존의 허밍 질의처리 시스템을 쉽고 편리하게 표현할 수 있음을 보인다. Query by humming is an effective and intuitive querying mechanism when a user wants to find a song without knowing lyrics. The query by humming system takes a user-hummed melody as input, compares it with melodies in a music database, and returns top-k similar melodies to the input. In this paper, we propose a novel algebra for query by humming, and design and implement a real query by humming system called HummingBase by exploiting the algebra. By analyzing existing similarity search techniques, we derive 10 core operators for the algebra. By using the well-defined algebra, we can easily implement such a system in a extensible and modular way. With two case studies, we show that the proposed algebra can easily represent the query processing processes of existing query-by-humming systems.
Kimoon Bong,Taewoo Kang,Haejong Yang,Jonghak Han,Wonjun Yang,Hyojin Jeong,Heejung Jung,Soonhong Hwang,Kyunghyun Kim 한국도시환경학회 2018 한국도시환경학회지 Vol.18 No.4
This study was carried out to assess the distribution and pollution level of organic matters and nutrients in surface sediments of the Yeongsan River Basin. The surface sediments were collected from the mainstream (12) and tributaries sites (4) for two years from 2015 to 2016, and the particle sizes, organic matters (Ignition Loss, COD, TOC) and nutrients (TN, TP, SRP) were analyzed. The distribution of particle sizes was dominated by sand in the upstream sites (MS1-MS7) and by silt loam in the downstream sites (MS8-MS12), but MS3 and MS6, located slightly upstream of the two weirs, were found to be mostly loamy sand and silt loam, respectively. As a results of the correlation assessment, the organic matters (IL, COD, TOC) were strongly correlated with particle sizes, while the nutrients (TP, SRP) were weak except for TN. The concentrations of organic matter and nutrient were higher at the downstream and the sites nearby the two weirs (MS3, MS6). In particular, the TP concentration at the MS3 site sampled in the second half period of the years was higher than that in the first half periods. Comparing of sediments criteria, the organic matters and nutrients were evaluated to have almost no toxic effects at all sites.
Biomimetic Superoxide Disproportionation Catalyst for Anti-Aging Lithium-Oxygen Batteries
Hwang, Chihyun,Yoo, JongTae,Jung, Gwan Yeong,Joo, Se Hun,Kim, Jonghak,Cha, Aming,Han, Jung-Gu,Choi, Nam-Soon,Kang, Seok Ju,Lee, Sang-Young,Kwak, Sang Kyu,Song, Hyun-Kon American Chemical Society 2019 ACS NANO Vol.13 No.8
<P>Reactive oxygen species or superoxide (O<SUB>2</SUB><SUP>-</SUP>), which damages or ages biological cells, is generated during metabolic pathways using oxygen as an electron acceptor in biological systems. Superoxide dismutase (SOD) protects cells from superoxide-triggered apoptosis by converting superoxide to oxygen and peroxide. Lithium-oxygen battery (LOB) cells have the same aging problems caused by superoxide-triggered side reactions. We transplanted the function of SOD of biological systems into LOB cells. Malonic acid-decorated fullerene (MA-C<SUB>60</SUB>) was used as a superoxide disproportionation chemocatalyst mimicking the function of SOD. As expected, MA-C<SUB>60</SUB> as the superoxide scavenger improved capacity retention along charge/discharge cycles successfully. A LOB cell that failed to provide a meaningful capacity just after several cycles at high current (0.5 mA cm<SUP>-2</SUP>) with 0.5 mAh cm<SUP>-2</SUP> cutoff survived up to 50 cycles after MA-C<SUB>60</SUB> was introduced to the electrolyte. Moreover, the SOD-mimetic catalyst increased capacity, <I>e</I>.<I>g</I>., more than a 6-fold increase at 0.2 mA cm<SUP>-2</SUP>. The experimentally observed toroidal morphology of the final discharge product of oxygen reduction (Li<SUB>2</SUB>O<SUB>2</SUB>) and density functional theory calculation confirmed that the solution mechanism of Li<SUB>2</SUB>O<SUB>2</SUB> formation, more beneficial than the surface mechanism from the capacity-gain standpoint, was preferred in the presence of MA-C<SUB>60</SUB>.</P> [FIG OMISSION]</BR>