• Journal of Wetlands Research
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• v.18 no.2
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• pp.201-207
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• 2016

In LID facilities treating stormwater runoff, various kinds of plants are applied for water circulation recovery and pollutant reduction. However, rapid changes of soil moisture due to the use of porous media and spread of deicing material during winter season cause slow plant growth that detrimentally leads to many problems including death of plants. Therefore, this study was performed to evaluate the salt resistance of plants, its effects on pollutants removal, and water circulation recovery. Eight different kinds of plants applicable to an LID facility were selected for the experiment, which were Bridal wreath (Spiraea japonica, S.J), Azalea (Rhododendron indicum, R.I), Dawn Redwood (Metasequoia glyptostroboides, M.G), Sweet flag (Acorus calamus A.C), Dwarf fan-shape columbine(Aquilegia flabellata, A.F), Pink (Dianthus chinensis, D.C), Pratia pedunculata (Pratia pedunculata, P.B) and Marigold (Tagetes patula, T.P). Woody plants such as S.P, R.I, and M.G appear to have less salt resistance compared to the other herbaceous plants. Specifically, M.G achieved the highest salt resistance among the other woody plants being followed by S.P, and R.I, respectively. For herbaceous plants, T.L and D.C have the higher salt resistances than that of A.C, P.B, and A.F, respectively. Regardless of the influence of salt to most of the plants, TN and TP were reduced more than 60% and the study suggests the M.G showed high pollutant removal efficiency and provided better water circulation by means of active photosynthesis and respiration due to higher growth.

• Journal of Environmental Science International
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• v.10 no.4
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• pp.293-298
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• 2001

The toxicity values heavy metals were evaluated by immobilization and chronic reproduction impairment tests, using Daphnia magna. Acute tests were evaluated by the inhibition of their mobilization after 24hrs without food addition. The tests of reproductive impairment were investigated for 21 days by food addition and exchange or water. The effect of each concentration was assessed by Probit analysis and t-test. The results obtained from this study were as follows : 1) The change of pH and DO was not significant in the acute tests, while, in the reproductive tests, pH was increased by 0.3~1.4 and DO also increased. 2) The $E_iC_{50}$ values of immobilization to Daphnia magna in artificial fresh water were $0.030mg/{\ell}(Cu),\;0.054mg/{\ell}(Cd),\;0.12mg/{\ell};(Cr),\;0.74mg/{\ell}(Pb),\;3.4mg/ {\ell}(As)$ and the $NOE_iC$ values were $0.010mg/{\ell}(Cu),\;0.018mg/{\ell}(Cd),\;0.010mg/{\ell}(Cr),\;0.10mg/{\ell}(Pb),\;and\;$1.8mg/{\ell}(As)$. 3) The $E_rC_{50}$ values of reproductive impairment to Daphnia magna were $13.8\mu\textrm{g}/{\ell}(Cu),\;2.9\mu\textrm{g}/{\ell}(Cd),\;15.5\mu\textrm{g}/{\ell}(Cr),\;61.7\mu\textrm{g}/{\ell}(Pb),\;759\mu\textrm{g}/{\ell}(As)$, and $NOE_rC$ values were $0.95\mu\textrm{g}/{\ell}(Cu),\;$0.54\mu\textrm{g}/{\ell}(Cd),\;1.2\mu\textrm{g}/{\ell}(Cd),\;$7.4\mu\textrm{g}/{\ell}(Pb),\;110mu\textrm{g}/{\ell}(As)$. The results of tests using OECD artificial culture water were more sensitive than natural water for culturing. The presented data show that an artificial culture water is suitable in the experiment of bioassay for assessing the toxicity of marterials.

• Korean Journal of Crystallography
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• v.5 no.1
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• pp.14-19
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• 1994

Tlifluoromethyltriphenyl-1,2,4-tioxolane(C2IHlsF303)is triclinic, space group P1 with a=10.477(1), b= 11.056(1), c=9.917(3) A, a=104.7(1), B=122.7(1), r=63.9(1), Z=2, V=867.9(3) A3, Dc=1.43 g/cm3, λ(Mo Ka)=0.71069 A, μ=0.0116 cm-1,F(000)=384, and R=0.067 for 1713 unique observed reflections with I > 1.0 o(I). The structure was solved by direct methods and refined by fall-matrix least-squares refinement with the fixed C-H bond lengths at 0.96 A. Two phenyl rings((2) and (3)) that have the dihydral angle of 106.0°.

• Archives of Plastic Surgery
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• v.47 no.2
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• pp.165-170
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• 2020

Background Perforator mapping has been well described in the literature. Once the suprafascial plane is reached, the course of perforators is considered constant. However, the surgeon must be aware of whether an anastomosis exists between perforators superficially to the fascia, in order to choose the best vessel upon which to base the reconstruction. Our retrospective in vivo anatomical study of lower leg perforator flaps presents the first description of variations in the suprafascial path of perforators, which may influence preoperative flap design. Methods An anatomical study of lower limb perforators was performed on 46 nonconsecutive patients who were referred to our department from June 2012 to October 2018. Reconstruction with perforator-based propeller flaps was planned for each of the patients. In total, 72 perforators were preoperatively identified and surgically isolated. The suprafascial course of each perforator was reported. Results During suprafascial surgical exploration, branching patterns were observed in four perforators. These perforators had been classified as single vessels in the preoperative ultrasonographic analysis. However, after surgical dissection, distal converging branches were noted in two of them. Conclusions Our study is the first description in the literature of suprafascial converging perforators, which might constitute an obstacle to planned reconstruction procedures. Despite the accuracy of preoperative evaluations, anatomical variations were present. Knowledge of suprafascial perforator variations may help surgeons to choose the correct perforator upon which to base a planned flap.

• Journal of the Korean Applied Science and Technology
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• v.40 no.4
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• pp.881-889
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• 2023

The genus Hymenobacter, type genus of the family Hymenobacteraceae and a member of the phylum Bacteroidota includes gram-negative and red-pigmented rods. Those bacteria have been isolated from various environments of the earth. I isolated a red-pigmented, gram-negative rod from a pond in the campus of the Changwon University, Changwon, Kyeongnam and designated this bacterium as strain B2. Strain B2 was further analyzed phylogenetically and biochemically, and concluded as a member of genus Hymenobacter. BLAST search of the 16S rRNA gene sequence of strain B2 showed its homology lower than 98.7% with those sequences of the other bacteria whose 16S rRNA gene sequences have been reported. Fatty acid composition of the strain B2 was analyzed and its major fatty acids are summed feature 3(C_16:1 ω7c and/or C_16:1 ω6c, 22.8%), iso-C_15:0 (16.2%), anteiso-C_15:0(12.9%), C_16:1ω5c(12.4%) and summed feature 4 (iso-C_17:1 I/anteiso-C_17:1)(9.5%) showing significant differences in fatty acid compositions between strain B2 and the other known Hymenobacter species. DNA sequence of 16S rRNA gene of strain B2 was deposited in genbank under accession number OQ318247.

• Proceedings of the KIEE Conference
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• 2005.07d
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• pp.2606-2608
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• 2005

In this paper we describe the fault detection methods in a Dual-Redundant Power Controller(DRPC) for Control Rod Control System(CRCS). The DRPC has the function of fault detection for controller itself and power modules. And in this paper we have described the some complex items out of fault detection methods for CRCS. By utilizing the suggested methods, we are convinced that these methods are applied to commercial use before long.

• Korean Journal of Pharmacognosy
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• v.36 no.1 s.140
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• pp.60-63
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• 2005

One sesquiterpenoid was isolated from the methanol extract of Atractylodes rhizomes which has been used as traditional medicine for diuresis and the compound was established as selina-4(14),7(11)-dien-8-one by the spectroscopic methods. The compound$(IC_{50}<10\;ppm)$ has inhibitory effects on melanogenesis in B16 mouse melanoma.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.419-421
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• 2015

미래 NCW의 핵심은 전투상황에 대한 정보를 데이터 특성에 따라 얼마나 신속 정확하게 공유하느냐가 중요하다. 이를 위해 대한민국 육군은 다양한 개인병사부터 합참에 이르기까지 각종 상황인식과 지휘통제에 필요한 데이터를 수집, 종합, 타격하는 체계를 구축하고 있다. 하지만, 통신장비와 전장단말기가 분리되어 있음에 따라 운용상 많은 제한사항이 있다. 이를 극복하기 위해 통신장비와 전장단말기를 통합하는 형태의 통합형 단말기가 강구되고 있으며, 이는 개인병사체계 및 무인지상감시 센서 등에서 개념 연구가 되어지고 있다. 하지만, 가장 중요한 부분인 데이터 송수신에 대한 최적의 방안이 미정립되어 있음에 따라 본 연구에서는 전송지연시간 단축 및 재전송 알고리즘 개선 등을 통한 효율적인 전송방안을 제안하고, 이를 시험을 통해 검증함으로써 미래 통합형 전장단말기의 데이터 전송관련 설계 방향을 제시하고자 한다.

• Proceedings of the Materials Research Society of Korea Conference
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• 1998.08a
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• pp.42.4-42
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• 1998

• Communications of the Korean Mathematical Society
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• v.36 no.2
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• pp.209-227
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• 2021

In this paper, we deal with the question that what kind of properties does a ring gain when it satisfies symmetricity or reversibility by the way of nilpotent elements? By the motivation of this question, we approach to symmetric and reversible property of rings via nilpotents. For symmetricity, we call a ring R middle right-(resp. left-)nil symmetric (mr-nil (resp. ml-nil) symmetric, for short) if abc = 0 implies acb = 0 (resp. bac = 0) for a, c ∈ R and b ∈ nil(R) where nil(R) is the set of all nilpotent elements of R. It is proved that mr-nil symmetric rings are abelian and so directly finite. We show that the class of mr-nil symmetric rings strictly lies between the classes of symmetric rings and weak right nil-symmetric rings. For reversibility, we introduce left (resp. right) N-reversible ideal I of a ring R if for any a ∈ nil(R), b ∈ R, being ab ∈ I implies ba ∈ I (resp. b ∈ nil(R), a ∈ R, being ab ∈ I implies ba ∈ I). A ring R is called left (resp. right) N-reversible if the zero ideal is left (resp. right) N-reversible. Left N-reversibility is a generalization of mr-nil symmetricity. We exactly determine the place of the class of left N-reversible rings which is placed between the classes of reversible rings and CNZ rings. We also obtain that every left N-reversible ring is nil-Armendariz. It is observed that the polynomial ring over a left N-reversible Armendariz ring is also left N-reversible.