모조선소의 밀폐된 작업장에서의 공기중 용접흄 및 중금속 농도에 관한 조사 연구

백남원,곽영순 한국산업위생학회 1997 한국산업보건학회지 Vol.7 No.1

This study was performed to evaluate the exposure levels of worker exposed to welding fume and metals in confined spaces of a shipyard. The airborne concentration of welding fumes and metal elements in confined spaces were compared with those in open working areas. Results of the study were as follows. 1. The geometric mean of welding fume concentration in a confined space was 16.6㎎/㎥, which contained 3.9㎎/㎥ Fe, 1.2㎎/㎥, Mg, 0.8㎎/㎥ Zn, 0.008㎎/㎥ Cu, 0.008㎎/㎥ Pb, 0.005㎎/㎥ Ni, 0.003㎎/㎥ Cr, 0.0003㎎/㎥ Cd. The geometric mean of welding fume concentration in open working areas was 5.2㎎/㎥, which contained 1.1㎎/㎥ Fe, 0.3㎎/㎥ Mg, 0.3㎎/㎥ Zn, 0.004㎎/㎥ Cu, 0.008㎎/㎥ Pb, 0.005㎎/㎥ Ni, 0.003㎎/㎥ Cr, 0.0003㎎/㎥ Cd. The geometric mean of welding fume concentration in confined spaces was 3,2 times higher than that in open working areas. The geometric mean concentrations of such metals as Fe, Mg, Zn, or Cu within fume in confined spaces were 2-4 times higher than those in open working areas, while little difference made such metals as Pb, Ni, Cr, Cd. 2. In 32 samples out of a total of 39 samples (82.1%) collected in confined spaces, the concentrations of welding fume exceeded TLV. while so did 19 samples out of 33 samples (57.6%) in open working areas. As for the concentrations of metals in welding flame from confined spaces, Fe exceeded TLV in 14 out of a fatal of 38 samples (36.8%), Mn exceeded TLV in 23 out of a total of 38 samples (60.5%). As for the concentration of metals in welding fume froth open working areas, Fe exceeded TLV in 3 out of a total of 34 samples (8.8%), Mn exceeded TLV in 6 out of a total of 34 samples (17.6%). Considering additive effect among metals, in 31 out of a total of 39 samples (79.5%) collected in confined spaces, the concentrations of welding fume exceeded TLV, while so did 14 out of 38 samples (55.6%p) in open working areas. 3. In respect of base metal and welding type the concentration of total welding fume by CO₂ gas W./mild steel was the highest, followed by semiauto MMA/mild steel, then followed by TIG or CO₂ gas W./stainless steel. ; as for concentration of metal within fume, a decreasing order was Fe, Zn, Mn, and Pb in CO₂ gas W./mild steel and semiauto MMA/mild steel, but Fe, Mn, Cr, and Ni in T1G or CO₂ gas W./stainless steel. 4. In case of welding base metal covered by paint, contents of Zn within red paint chip and within gray paint chip were 14.0% and 0.08% respectively, which showed a little difference, while the airborne concentrations of Zn within fume during welding base metal covered red paint and gray paint were 1.351 ㎎/㎥ and 1.018 ㎎/㎥ respectively, which showed little difference. As for Pb, contents of red paint chip and gray paint chip were 0.14% and 0.08% respectively, and the airborne concentrations within fume during welding base metal covered red paint and gray paint were 0.009 ㎎/㎥ and 0.007 ㎎/㎥ respectively, both of which showed little difference.

Assessment of Genetic Diversity of Korean Landrace Rice Accessions (Oryza sativa L.) by Microsatellite Analysis

Sok-Young Lee,마경호,Ju-Kyong Lee,정종욱,Yong-Jin Park,Hee-Kyoung Kang,Jung-Ro Lee,Jae-Gyun Kwag,Nam-Soo Kim,Tae-San Kim 한국육종학회 2006 한국육종학회지 Vol.38 No.2

Genetic diversity of Korean landrace rice accessions was assessed with microsatellite markers. The 214 alleles weregedfrom 3 for SSS locus to 37 for RM206 locus with an average number of 12.6 alleles per locus. Gene diversity values according tothe 17 microsatellite primer loci varied from 0.045 to 0.934 with an average of 0.676. Among the 14 microsatellite primers, RM48,RM206, RM214, RM232 and RM249 showed comparatively high number of aleles. On the UPGMA cluster analysis based on theGS coefficient matrix, the 175 Korean landrace rice accessions were divided into five major groups and the genetic similarity coef-to0.664 depending on the 17 microsatellite loci. While the Group IV showed the highest average value in gene diversity, hencegroup II showed the lowest average value of gene diversity among the five groups. The assesment of genetic diversity of Koreannative rice accessions by the present microsatellite analysis will be helpful for efficient conservation strategy of rice germplasm.This preliminary work may also provide a protocol for a larger-scale evaluation of molecular diversity of germplasm of Koreanlandrace rice accessions.Clustering, Genetic diversity, Korean rice landrace, microsatellite markers

Multipath Routing for Load Balancing in Wireless Mesh Network

고휘 ( Hui Gao ),곽용완 ( Young-wan Kwag ),이형옥 ( Hyung-ok Lee ),남지승 ( Ji-seung Nam ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2

Multipath routing is proposed to perform better load balancing and to provide high fault tolerance. In this paper common factors on multi-path routing for WMNs are discussed and joint multi-channel and multipath routing approaches for load balancing are introduced at the same time. The key issues on how to design an effective multi-path routing protocol with appropriate performance metrics for WMNs are also discussed through the case studies in the paper

A Scheme of Channel Diversity Load Balancing Consideration for Path Selection in WMNs

고휘 ( Hui Gao ),곽용완 ( Young-wan Kwag ),이형옥 ( Hyung-ok Lee ),남지승 ( Ji-seung Nam ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1

This paper proposes a channel diversity based load-balancing cross-layer routing scheme for Wireless Mesh Networks (WMNs). The proposed scheme deals with channel diversity phase and load balancing phase in WMNs. Channel diversity factor metric_ch-d and load balancing factor f_load are defined and employed cooperatively as a combined path selection policy.

Seven Newly Recorded Macrofungi of Inocybaceae (Agaricales, Basidiomycota) in Korea

( Sung-eun Cho ),( Young-nam Kwag ),( Sang-kuk Han ),( Chang Sun Kim ) 한국균학회 2021 韓國菌學會誌 Vol.49 No.2

The Inocybaceae is a family of ectomycorrhizal fungi belonging to the Agaricales order. Most species in this family produce secondary metabolites, such as muscarine, psilocybin, and other compounds. In the present study, we conducted taxonomic studies on the Inocybaceae based on morphological and molecular phylogenetic analyses for the first time in Korea. As a result, seven species of Inocybaceae were newly recorded: Inocybe caroticolor, I. fuscidula, I. grammatoides, I. latibulosa, I. stellata, Inosperma shawarense, and Mallocybe malenconii. Among them, the genera Inosperma and Mallocybe were described for the first time in Korea. Relevant morphological characteristics, phylogenetic trees, and photographs are provided.

Taxonomic Re-evaluation of Korean Gyromitra Species Based on Morphological and Phylogenetical Studies

( Sung-eun Cho ),( Young-nam Kwag ),( Sang-kuk Han ),( Chang Sun Kim ) 한국균학회 2021 韓國菌學會誌 Vol.49 No.3

Several species of Gyromitra are highly poisonous when consumed raw the presence of gyromitrin. In this study, Gyromitra specimens deposited in the Korea National Arboretum were re-examined and subjected to molecular sequence analysis. G. gigas, G. aff. perlata, and G. tianshanensis were identified based on their morphological features and molecular phylogenetic analysis for the first time in Korea. Furthermore, internal transcribed spacer and 28S rRNA sequences of G. esculenta and G. infula were analyzed to confirm their phylogeny.

Two New Records of Scleroderma Species (Sclerodermataceae, Boletales) in South Korea

Cho Sung Eun,Kwag Young-Nam,Han Sang-Kuk,Lee Dong-Hyeon,Kim Chang Sun 한국균학회 2022 韓國菌學會誌 Vol.50 No.2

Two new records of Scleroderma species from South Korea are described here. Comprehensive taxonomic studies of Scleroderma specimens were conducted at the Korea National Arboretum. Based on morphological and molecular data (fungal barcode sequences), two new records (S. laeve and S. nastii) were confirmed. Herein, morphological descriptions, including Scanning Electron Microscope (SEM) images of basidiospore ornamentation, and a taxonomic key of Korean Scleroderma species are provided.

Current Taxonomical Status of Korean Auricularia Species

( Sung-eun Cho ),( Young-nam Kwag ),( Dong-hyeon Lee ),( Jae-gu Han ),( Chang Sun Kim ) 한국균학회 2021 韓國菌學會誌 Vol.49 No.1

Auricularia (Auriculariaceae, Basidiomycota) is well-known jelly fungi, and most species are cultivated or utilized medicinally around the world. A total of 127 Auricularia specimens were collected during Korean mushroom forays by the Korea National Arboretum from 2008 to 2020. In this investigation, fungal barcode analysis and morphological examinations of 33 specimens were conducted and five Korean Auricularia species were identified. Of the species identified, A. americana, A. heimuer, and A. villosula were new to Korea, while A. auricula-judae which was previously identified in Korea, was not found. Herein, we discuss the Korean Auricularia species and provide a taxonomic key for their morphological identification.

A Study on WMNs Based Routing Metrics for High Throughput Multicast

고휘 ( Hui Gao ),곽용완 ( Young-wan Kwag ),이형옥 ( Hyung-ok Lee ),박준석 ( Jun-seok Park ),남지승 ( Ji-seung Nam ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2

There has been growing interest in multicast technologies for wireless mesh networks with increasing demand for enjoying seamless multimedia broadcast service such as mobile IPTV anytime anywhere for any content on any device. This paper addressed the factors that should be considered when designing multicast algorithm in WMNs. Several routing metrics which are adapted for WMNs based multicast are described in detail to show that the main design goal for multicast metric is to achieve high throughput. Those metrics that take into account the characteristics of WMNs such as wireless broadcast advantage or channel diversity can arrange load balancing more effectively.

Two New Species of the Family Acarosporaceae from South Korea

Jung Shin Park,Young-Nam Kwag,Sang-Kuk Han,Soon-Ok Oh 한국균학회 2023 Mycobiology Vol.51 No.4

Acarosporaceae is a crustose lichen and is known as a species that has more than 50 multispores,and has hyaline spores. Those taxa are often found in rock and soil in mountainareas or coastal regions in Korea, and very diverse forms and species are known. However,after an overall genetic phylogenetic analysis of carbonized ascomata in 2015, species consistingonly of the morphological base are newly divided, and several species ofAcarosporaceae in Korea are also being discovered in this situation. As a result of analysisusing internal transcribed spacer (ITS) and nuLSU gene analysis, Korean species belonged toAcarospora and Sarcogyne clade, and Acarospora classified as the Acarospora clade wasmixed with the Polysporina group and the Sarcogyne clade is mixed with the Acarospora. Weidentified two new species (Acarospora beangnokdamensis J. S. Park & S. O. Oh, sp. nov.,Sarcogyne jejuensis J. S. Park & S. O. Oh, sp. nov.) through morphological, molecular, and secondarymetabolite substance and found one new record (Sarcogyne oceanica K. Knudsen &Kocourk). We have made a classification key for Acarospora and Sarcogyne in Korea andreported all information together here.