• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.04a
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• pp.60-60
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• 2019

지속가능한 개발이 주목받고 남북 평화의 시대를 맞이하여 임업분야와 농업 축산분야가 결합된 혼농임업(Agroforestry)이 주목받고 있다. 혼농임업(Agroforestry)은 식량, 과실, 풀사료, 땔감, 목재 등을 생산하고 토양보전을 실천하여 지속농업을 가능케 하는 복합영농의 한 형태이며, 북한 산지의 경우 황폐화된 산지가 많아 경제성과 산림녹화를 동시에 해결할 수 있어 많은 관심을 받고 있다. 본 연구는 강원도 하늘목장을 시범목장으로 선정하여 조사를 실시하였고, 연구조사지의 총 면적은 2.4ha로 백두대간과 오대산국립공원이 인접한 지역으로 다양한 식물상을 파악할 수 있는 지역이다. 그러므로 외래종침입에 따른 생태적 교란을 방지하기 위하여 완충지대를 설정하고 식물상 조사를 실시하였다. 그리고 조사지내의 대표 수종으로 선정된 모수만 남기고 벌채를 실시하여 변화양상을 모니터링 하였다. 2014년~2017년 총 3개년 계절별 조사를 통해 임간초지의 식물상 정보를 파악하였고 임간초지의 관속식물상을 조사한 결과 92과 250속 323종 4아종 43변종 6품종으로 총 376분류군이 조사되었다. 자원식물의 유용도 분석한 결과 식용자원(E)이 160분류군으로 가장 많은 비율을 차지하고 있었으며, 약용(M) 141분류군, 관상용(O) 45분류군으로 나타났으며, 용도미상(U) 식물도 73분류군이 분포하고 있는 것으로 나타났다. 또한 연구 대상지역의 특성을 고려하여 조성된 초지 내에서 조사료로 사용할 수 있는 식물 종을 파악하였다. 나아가 미비한 임간초지 식생의 DB를 구축하고, 지속가능한 녹색성장을 모색하여야 할 것이다.

• Journal of the Microelectronics and Packaging Society
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• v.20 no.2
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• pp.29-32
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• 2013

The surface roughness and reflectivity of electroless-plated Sn-3.5 wt%Ag on a LED (light emitting diode) lead frame were investigated. Cu electroplating was carried out prior to electroless plating of Sn-3.5Ag to improve the reflectivity of the Sn-3.5Ag deposit. In order to investigate the effect of stirring speed and temperature of the plating solution, surface roughness and reflectivity was measured. The experimental results revealed that the thickness of the deposit layer increased with stirring speed and temperature of the plating solution. Stirring speed is increased from 100 to 300 rpm, the surface roughness was reduced from 0.513 to 0.266 ${\mu}m$, and the reflectivity increased from 1.67 to 1.84 GAM. As temperature of the plating solution increased from 25 to $45^{\circ}C$, the surface roughness reduced from 0.507 to 0.350 ${\mu}m$, and the reflectivity increased from 1.68 to 1.84 GAM.

• The Korean Journal of Pesticide Science
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• v.11 no.3
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• pp.131-137
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• 2007

CoMFA and CoMSIA model were derived and reviewed on the insecticidal activities of N-substituents (X) on the imidazol ring in imidacloprid analogues at the different alignment condition. Regarding the predictability ($q^2$ or $r_{cv.}^2$) and fitness ($r_{ncv.}^2$) of the two optimized models, the atom based fit (A) alignments were better than that of the field fit (F) alignment and, on the other hand, CoMSIA (A10) model was better than CoMFA (A5) model. Also, from the most optimized CoMSIA (A10) model, the insecticidal activity by N-substituents (X) was dependence on the electrostatic field and H-bond acceptor field. It is predicted that, from the contour maps with optimized CoMSIA (A10) model, H-bond acceptors at ortho- and meta- position will contribute for improving of insecticidal activities and, as the functional groups of carbonyl oxygen atom are charged negatively and positively charged at the ortho- position of benzyl group, insecticidal activities will also be improved.

• Journal of dental hygiene science
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• v.13 no.3
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• pp.330-338
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• 2013

In order to explore microleakage in class V cavity based on different kinds of several dentin adhesive and composite resin, 2 kinds of composite resin was restored and exposed after applying 4 kinds of dentin adhesives. Deposited in methylene blue solution for 4 hours and cut in parallel with tooth longitudinal axis. By observing dye penetration level of enamel and dentin margins of each restored resin following conclusion was obtained. 1. In composite resin Filtek Z350XT Universal (3M/ESPE Dental Products, USA) in enamel margin, Easy Bond (3M/ESPE Dental Products) showed the lowest microleakage and this leakage was represented to be high in the order of Single Bond 2 (3M/ESPE Dental Products), Scotchbond Multi-Purpose (3M/ESPE Dental Products) and Cearfil SE Bond (Kuraray Medical Inc., Japan). In case of Filtek Z350XT Flowable (3M/ESPE Dental Products), Scotchbond Multi-Purpose showed the lowest microleakage and this leakage was represented to be high in the order of Single Bond 2, Clearfil SE Bond and Easy Bond. 2. In case of Filtek Z350XT Universal in dentin margin, Easy Bond showed the lowest microleakage and this leakage was represented to be high in the order of Scotchbond Multi-Purpose, Single Bond 2 and Clearfil SE Bond. In case of Filtek Z350XT Flowable, Scotchbond Multi-Purpose and Single Bond showed the lowest microleakage and this leakage was represented to be high in the order of Clearfil SE Bond and Easy Bond. 3. In all the groups excepting S-U group (Single Bond 2+Filtek Z350XT Universal), enamel margin showed more higher microleakage than that of dentin margin. 4. There was a difference between enamel and dentin margin among each group but it was not significant statistically (p>0.05). When summarizing this result, it is considered that composite resin and dentin adhesive could be applied selectively and particularly in case of applying 1-step self-etching dentin adhesive, this method would be advantageous for manipulation convenience and shortening of operation time.

• Membrane Journal
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• v.24 no.3
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• pp.185-193
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• 2014

PDMS (polydimethylsiloxane)-HNT (halloysite nanotube) composite membranes were prepared with different amounts tendency of HNT 5, 10, 20 and 30 wt% and rubbery polymer PDMS. The characteristics of these membranes were studied by FT-IR, XRD, TGA, and SEM. Gas permeation experiment were performed under condition of $25^{\circ}C$ and $3kg/cm^2$. Gas permeability of $N_2$, $H_2$, $CH_4$, and $CO_2$ and selectivity were investigated by increasing the amount of HNT contents in the PDMS. In $H_2$, $N_2$, $CH_4$, and $CO_2$ gases, as increasing HNT contents from 0 to 30 wt%, decreasing value of the permeability were observed. The selectivity of ($CO_2/N_2$) was shown in the range of 14 to 44 and the range of selectivity of ($CO_2/CH_4$) was 3.0 to 7.0.

• Journal of Yeungnam Medical Science
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• v.6 no.2
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• pp.121-125
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• 1989

Total 21 patients with airway obstruction from lung cancer treated with radiotherapy at Department of Therapeuctic Radiology, Yeungnam University College of Medicine, between April 1986 and December 1988 are retrospectively analysed by means of roentgenologic findings. Obtained results are as follows. 1. 15 out of 21 patients(71%) showed complete or partial response. 2. Patients with small cell lung cancer showed 100% response in spite of low dose(30GY/10 fractions). 3. Patients with non-small cell lung cancer treated with 50GY or over showed better response than below 45GY or below. 4. There is no relationship between the response and site of airway obstruction. These data suggested that high dose irradiation is more effective in the management of airway obstruction from lung cancer and meticulous radiotherapy planning with appropriate protection of normal lung and critical organs should be investigated in order to maximize radiation effect and minimize side effect, complication or sequelae.

• Journal of IKEEE
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• v.27 no.3
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• pp.288-295
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• 2023

In this work, we investigated the role of oxygen annealing on the performance of Metal-Semiconductor-Metal (MSM) UV photodetector (PD) fabricated by radio frequency (RF)-sputtered Ga₂O₃ films on SiC substrates. Oxygen-nnealed Ga₂O₃ films displayed a notable increase in photocurrent and a faster decay time, indicating a decrease in persistent photoconductivity. This improvement is attributed to the reduction of oxygen vacancies and variation of defects by oxygen post-annealing. Our findings provide valuable insights into enhancing PD performance through oxygen annealing.

• Proceedings of the Materials Research Society of Korea Conference
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• 2009.11a
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• pp.37.1-37.1
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• 2009

몰리브덴 금속박막(Metal Mo)은 우수한 전기전도도로 인해 $CuInSe_2$로 대표되는 I-III-$VI_2$족 화합물 반도체 박막태양전지에서 후면전극으로 널리 이용되고 있는 재료로서 일반적인 증착방법으로CVD, PVD, Thermal evaporation, Sol-gel 등이 있으며, 이중에서 Sputtering에 의한 증착법이 주로 사용되고 있다. 이에 본 연구에서는 $MoO_3$분말의 수소 환원 과정 중에 발생하는 기상인 $MoO_3(OH)_2$ 기상의 화학증기수송(CVT)를 이용하여 $MoO_x$ 박막을 증착하고 다시 수소분위기에서 수소 환원하는 증착법을 통해 균일하고 부착성이우수한 Mo 박막을 제조 하였다. $550^{\circ}C$, 60min의 유지시간에서 약 900nm의 균일한 $MoO_x$ 박막을 증착하였으며, $650^{\circ}C$, 15min 의 환원조건에서 모두 금속 몰리브덴 박막으로 상변화 함을 XRD와 SEM을 통해 확인하였다. 본 연구에서 사용된 화학증기수송에 의한 박막 증착은 기존의 공정에 비해 매우 저렴하며, 반응중에 유해하지 않은 부산물로 인해 환경 친화적이며 또한 대형화가 가능한 공정으로 많은 응용이 기대된다.

• Journal of Navigation and Port Research
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• v.32 no.3
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• pp.229-235
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• 2008

This paper was provided to apply the ITC-Hulls Clauses & ISM Code for the accident of sunken ship which was occurred by seamen's barratry. For the causes of the sunken accident, the underwriter insisted toot shipowner submerged the vessel intentionally for the purpose of the insured amounts, while shipowner protests toot the ship was submerged because of crews faults. In this connection, the judge sentenced toot this accident was caused by humans errors as the Provisions of 6.2.4 of ITC-Hulls, however shipowner is responsible for hiring onboard qualified seafarers and carrying out the due diligence for performing ISM Code for ensuring ship's safety and seaworthiness.

• Journal of Conservation Science
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• v.32 no.3
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• pp.425-436
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• 2016

The Yakhyeon catholic church (Historic Site No. 252 in Korea) that was constructed in 1892 has been the first western brick structure to ever have existed and one of the most important historical materials in the Korean modern architecture. After a fire had broken out at the catholic church in 1998, the stained glass on the back wall, the slab glass (dalle de verre) introduced by Lee Nam Guy in 1974, was repaired in 1999 because of singe scorch and water leakage. An analysis of the coloration elements showed that yellow, red and green included Zn, K and Cd, respectively. The glass of red contained Se, dark green contained Mn and Cr, and blue contained Pb and S. According to material analysis, the masonry joint was identified dolomite ($CaMg(CO_3)_2$) and calcite ($CaCO_3$), which was observed plate, columnar, rhombic and square of crystalline particles. Meanwhile, ultrasonic velocity in the stained glass recorded low speed in the middle and lower right of the window (an average of 4,130 m/s). And the joint was measured the lowest physical properties of the top left and middle of the window (an average of 2,053 m/s). This study have showed that extensive physical damage was founded to the left and middle rather than the right side. In this respect, more research in needed to conserve the correlation between color and physical properties.