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Deep learning-based direction finding in the presence of direction-dependent mutual coupling
Kyungsik Seo,Jaekoo Lee,Song Noh 한국통신학회 2023 ICT Express Vol.9 No.4
In this paper, the problem of direction finding is considered for millimeter-wave communication with direction-dependent mutual coupling. For direction-of-arrival estimation, a low-complexity deep neural network (DNN)-based regression model is proposed, taking an array output as the DNN input with a straightforward preprocessing step. In addition to designing DNN building blocks, a quantitative analysis is performed to enhance the generalization capability of the DNN trained with finite-size training data. A theoretical performance bound is derived in terms of the Cramr-Rao lower bound (CRLB). The effectiveness of the proposed approach is verified by comparison with existing methods and the CRLB.
고밀도 폴리에틸렌 삽입물(MEDPOR)을 이용한 비첨성형술
송형근,구본준,유재호,김경식 大韓成形外科學會 1995 Archives of Plastic Surgery Vol.22 No.1
From and aesthetic surgical point of view, rhinoplasty is a surgical technique correcting the following portions of the nose: the shape of nasal dorsum line, height of lateral aspect of nose, the shape of nasal dorsum, the shape of nasal tip, the shape of columella, and columella and external nostril on Worm's eye view etc. In order to produce optimal nasal shape for the patient's face, the plastic surgeons interest in the continued effort for rhinoplasty, which was to apply proper operating technique by providing prudent consideration on the nasal site. The authors performed rhinoplasty focusing on the shape of nasal tip. We used the high density polyethylene implantation technique for the patient with potentially unsatisfactory results of applying classical tip plasty using autogenous cartilage graft. The main reasons for employing high density poyethylene implants were : 1) Disadvantages of autogenous cartilage graft, such as prolonged operating time, limitation of donor site, difficulties in onlay cartilage graft and sandwich graft desired proper nasal tip augmentation and unpredictable prognosis. 2) In term of degree of hardness and flexibility, high density polyethylene is similar to the tissue, compared to other artificial material when used on soft tissue defect. 3) High density polyethylene produces tissue ingrowth so easily that it has fixation effect by bonding with surrounding tissues. Prognosis and the results of operation can be predictable since it shows no absorption. Our department performed 20 cases of nasal tip plasty using high density polyethylene implants between May 1993 and March 1994 : 14 cases combined with augmentation rhinoplasty, 2 cases of corrective rhinoplasty for crooked nose and 4 cases of pure nasal tip plasty. No complication were observed during post operative follow-up and the results of the use of high density polyethylene implantation. We are reporting these cases with review of literatures.
Sang Hwa Song,Kyungsik Lee,HeeHwan Shin,BeomSoo Yoon 한국산업경영시스템학회 2013 한국산업경영시스템학회 학술대회 Vol.2013 No.춘계
District heating is a system of distributing heated water from centralized facilities to local homes and buildings. In this paper, we model the distribution planning problem as a supply chain planning problem and propose an explicit column generation algorithm to handle large scale data as well as nonlinear constraints. The algorithm has been successfully applied to a Korean district heating company and the computational experiments show that the integrated operation of district heating network improves the total profit compared to the previous isolated network operation.
Park, Minjoon,Do, Kyungsik,Kim, Jaemin,Son, Donghee,Koo, Ja Hoon,Park, Jinkyung,Song, Jun-Kyul,Kim, Ji Hoon,Lee, Minbaek,Hyeon, Taeghwan,Kim, Dae-Hyeong Wiley (John WileySons) 2015 Advanced healthcare materials Vol.4 No.7
<P>Oxide nanomembrane hybrids with enhanced mechano- and thermo-sensitivity for semitransparent epidermal electronics are developed. The use of nanomaterials (single wall nanotubes and silver nanoparticles) embedded in the oxide nanomembranes significantly enhances mechanical and thermal sensitivities. These mechanical and thermal sensors are utilized in wheelchair control and hypothermia detection, which are useful for patients with strokes.</P>
Bae, Hanna,Lee, Jung-Ho,Song, Sung Joon,Ryu, Jongseong,Noh, Junsung,Kwon, Bong-Oh,Choi, Kyungsik,Khim, Jong Seong Elsevier 2018 Environmental pollution Vol.241 No.-
<P><B>Abstract</B></P> <P>A long-term study on a benthic community was conducted in two different localities, one in semi-enclosed bay of Jinhae (n = 10, south coast) and the other in open sea area of Samcheok (n = 10, east coast), Korea, respectively. We aimed to identify the spatiotemporal patterns of macrozoobenthos and the environmental variables influencing such patterns in the two contrasting habitats. The macrozoobenthos assemblages on the soft bottom of the subtidal zone were analyzed over the 3 years, encompassing 12 consecutive seasons, in 2013–2016. Among the 22 environmental variables measured, organic matter, dissolved oxygen, mean grain size, and water depth showed clear differences between two study areas. Accordingly, several ecological indices (such as the number of species, abundance, dominant species, and diversity index (<I>H</I>’)) generally reflected site-specific benthic conditions. The macrofaunal community in the Jinhae showed typical seasonal fluctuations, whereas the Samcheok community showed no significant change over time and space. Region- or site-dependent temporal variabilities of macrofaunal assemblages are depicted through cluster analysis (CA), indicating distinct temporal changes in the composition of dominant species. In particular, the abundance of some dominant species noticeably declined in certain seasons when several opportunistic species peaked. Such faunal succession might be explained by significant changes to specific environmental factors, such as bottom dissolved oxygen, grain size, and water depth. Principle component analysis further identified major environmental factors, i.e., sediment properties in Jinhae and water quality parameters in Samcheok community, respectively. In addition, discriminant analysis confirmed the presence of several site-specific parameters for the faunal assemblage groups identified through CA. Finally, indicator value analysis identified species that were representative across stations and regions in accordance with their habitat preference and/or species tolerance. Overall, the two contrasting nearshore habitats showed distinct community differences, in time and space, that were influenced by site-dependent environmental conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Addressed long-term spatiotemporal dynamics of macrozoobenthos in two contrasting habitats. </LI> <LI> Evidenced site-specific seasonal dynamics by species composition or several dominant species. </LI> <LI> Identified key factors of water quality and sediment properties linked to faunal assemblages. </LI> <LI> Confirmed opportunistic species and/or indicator species that prevailing in given environments. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Bae, Hanna,Lee, Jung-Ho,Song, Sung Joon,Park, Jinsoon,Kwon, Bong-Oh,Hong, Seongjin,Ryu, Jongseong,Choi, Kyungsik,Khim, Jong Seong Elsevier 2017 CHEMOSPHERE - Vol.171 No.-
<P><B>Abstract</B></P> <P>In this study, spatiotemporal dynamics of macrofaunal assemblages and their associations with environmental conditions were examined in Jinhae Bay (10 sites), where the obvious sources of pollution including industries, oyster farms (hanging cultures), and municipal discharges has surrounded. The survey had performed over five consecutive seasons in 2013–2014. Target sedimentary variables included grain size, organic content, C/N ratio, carbon and nitrogen stable isotope ratios, and some heavy metals. Five ecological quality indices (EcoQ) were calculated from the benthic community data to evaluate ecological qualities in site-specific manner. Jinhae Bay is a shallow (depths range, 11–24 m) and typical semi-enclosed bay. The benthic environments represented mud dominated bottoms (>70%) with fairly substantial organic content levels (>2%) over all five seasons. Seasonal patterns were observed with peak abundances in the spring and distinctive macrozoobenthos species shifts in the summer. The spring bloom could be explained by drastic increases of some polychaetes, mainly <I>Capitella</I> sp., at certain site, particularly near the shore. The oyster farms situated in the innermost locations seem to provide organic-rich bottoms being dominated by opportunistic species and/or organic pollution indicator species, such as <I>Lumbrineris longifolia</I>, <I>Capitella</I> sp., and <I>Paraprionospio patiens</I>. In general, the EcoQ indicators indicated that Jinhae Bay was moderately polluted, with exceptionally poor EcoQ in a few locations during the specific season(s). Overall, adverse effects on benthic community was broadly attributable to contaminations of heavy metals and nearby aquatic farm activities in Jinhae Bay, which requires a prompt action toward ecosystem-based management practice in the given area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Spatiotemporal dynamics of macrofaunal assemblages in Jinhae Bay were addressed. </LI> <LI> Peak abundances in spring and distinctive species shifts in summer were characteristic. </LI> <LI> Oyster farming was one potential anthropogenic stress affecting macrofaunal communities. </LI> <LI> Analysis of five ecological quality indices indicated moderate pollution in given area. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>