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송종관 경성대학교 공학기술연구소 2001 공학기술연구지 Vol.8 No.-
In this paper a fast algorithm to search the median value among the sample data. This algorithm is based on bit-level search method. The median value may be found with proposed algorithm by simple bit comparing operation. Compared with previous method, proposed algorithm reduce searching time and implementation complexity. Moreover, the searching time is independent on the number of window size.
송종관,손원무 경성대학교 공학기술연구소 2003 공학기술연구지 Vol.S2 No.2
The SA filters have a very flexible structure by limiting the maximum subwindow size. This flexible structure presents an effective trade-off between the complexity and performance fo the filters. In this paper, an experimental result is presented showing the performance variation according to the change of filter order and subfilter type(such as (max, min, exclusive-OR, med). We designed optimal SA filters minimizing MSE for the various noise condition. The result shows several new properties of SA filters.
Effect of Chlorine Dioxide Treatment on Microbial Growth and Qualities of Chicken Breast
Jongkwan Ko,Yuhyun Ma,Kyung Bin Song 한국식품영양과학회 2005 Preventive Nutrition and Food Science Vol.10 No.2
Chlorine dioxide (ClO₂) treatment was evaluated for microbial growth inhibition and its effects on the quality of vacuum-packaged chicken breasts. Chicken breast samples were treated with 3, 50, and 100 ppm of ClO₂ solution, respectively. After ClO₂ treatment, chicken breast samples were individually vacuumpackaged and stored at 4℃, a typical storage temperature for meat and meat product, for 7 days. The vacuum-packaged chicken breasts treated with ClO₂ had significantly lower total bacteria, yeast and mold, total coliform, and Salmonella spp. were significantly reduced by ClO₂ treatment. D_(10)-values of total bacteria count, yeast and mold, total coliform, and Salmonella spp. in vacuum-packaged chicken breasts was 93, 83, 85, and 50 ppm, respectively. The pH of vacuum-packaged chicken breasts decreased with increasing ClO₂ concentration. Thiobarbituric acid reacted substance (TBARS) values of vacuum-packaged chicken breasts increased during storage, regardless of ClO₂ concentration. ClO₂ treatment caused negligible changes in Hunter L, a, and b values in the vacuum-packaged chicken breasts. Sensory evaluation of the vacuumpackaged chicken breasts showed that there were no significant changes among the samples treated with various ClO₂ concentration. These results indicate that ClO₂ treatment could be useful in improving the microbial safety and quality of meat products.
3차원 카본클로스를 사용한 전고체 리튬-황 전지의 성능 개선
이종관(Jongkwan Lee),허국진(Kookjin Heo),송영웅(Youngwoong Song),황다희(Dahee Hwang),김민영(Minyoung Kim),임진섭(Jinsub Lim) 한국전지학회 2021 한국전지학회지 Vol.1 No.2
전고체 리튬-황 전지는 리튬-황 전지의 단점인 고차 폴리설파이드의 셔틀현상을 억제 할 수 있는 유망한 해결책이다. 또한, 3차원적으로 넓은 표면적과 높은 전도도를 가지는 양극은 리튬-황 전지의 낮은 전도도를 향상시키는데 효과적이다. 본 연구에서 빠른 넓은 표면적과 높은 이온전도도를 바탕으로 빠른 전하전달이 가능한 3차원 카본클로스를 사용하여 양극을 제작하였다. 그 결과, 전고체 리튬-황 전지는 0.1C에서 약 25% 증가한 초기용량과 0.2C에서 10% 증가한 고율 특성을 구현하였다. 이는 carbon cloth를 사용하여 제작한 양극이 전고체 리튬-황 전지의 전기화학적 성능을 개선할 수 있음을 보여주었다. All-solid-state lithium-sulfur batteries is a promising solution to restrict the shuttle effect of longchain polysulfides. In addition, three-dimensionally large-surface area and high conductivity cathode is effective method to improve low conductivity of lithium-sulfur batteries. Herein, we constructed three-dimensional carbon cloth cathode with fast charge transfer through large surface area and high conductivity. As a result, the all-solid-state lithium-sulfur batteries with as-constructed cathode achieved about 25% improved initial capacity at 0.1C and about 10% increased C rate performance at 0.2C, respectively. It showed possible to improve the electrochemical performance of all-solid-state lithium-sulfur batteries with as-constructed cathode.
Ryu, Jongkwan,Song, Hansol Pergamon Press 2019 Building and Environment Vol. No.
<P><B>Abstract</B></P> <P>This study compared single-number quantities (SNQs) for rating noises that originate from sanitary installations in residential buildings by objective and subjective methods. Field measurements of bathroom noises (toilets and basins) in apartment buildings were first conducted and their temporal properties and SNQs were compared. Results showed that the temporal characteristics of water supply and drainage noises from the toilet and basin of a bathroom varied depending on the measurement locations (e.g., bathrooms and bedrooms in upper and lower living units). Nevertheless, the correlation coefficient between SNQs (<I>L</I> <SUB>Aeq</SUB> and <I>L</I> <SUB>AFmax</SUB>) was very high for toilet noise (r = 0.98) and basin noise (r = 0.98) individually as well as for all noise data (r = 0.96). In addition, relationships between both SNQs and the annoyance levels for bathroom noise were investigated through listening tests. It was observed that both SNQs (<I>L</I> <SUB>Aeq</SUB> and <I>L</I> <SUB>AFmax</SUB>) were highly correlated with annoyance for individual toilet and basin noises. However, when all data of both bathroom noises were combined for the correlation analysis, <I>L</I> <SUB>AFmax</SUB> yielded a higher correlation coefficient with annoyance than <I>L</I> <SUB>Aeq</SUB>. The results of the study suggest that <I>L</I> <SUB>AFmax</SUB> is the more appropriate SNQ for rating various bathroom noises having different temporal characteristics that depend on the sanitary installation types and on the noise exposure location. It was also found that a person's annoyance because of bathroom noise can be affected by their hearing situation (whether the noise originates in their unit or from another unit).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Temporal characteristics of bathroom noise varied with measurement locations. </LI> <LI> Correlation coefficient between SNQs (<I>L</I> <SUB>Aeq</SUB> and <I>L</I> <SUB>AFmax</SUB>) was very high. </LI> <LI> <I>L</I> <SUB>AFmax</SUB> had a higher correlation coefficient with annoyance than <I>L</I> <SUB>Aeq</SUB>. </LI> <LI> Annoyance due to bathroom noise can be affected by hearing situation. </LI> </UL> </P>