• Korean Journal of Construction Engineering and Management
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• v.20 no.3
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• pp.22-30
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• 2019

The purpose of this study is to derive basic data of the Guaranteed Maximum Price(GMP) process and to present specimens that can be used at the time of execution of CM at Risk project in South Korea. CM at Risk project is issued in South Korea, but the actual data is lack. On the other hand, CM at Risk project is universalized and the market of the CM at Risk is steadily growing. Because of that, in this study, The United States cases was selected as a sample. GMP consists of CM's fee, CM contingency, project direct cost, project indirect cost, allowance. GMP negotiations are performed before the end of design completion, and after 3 rounds of estimation comparison, preliminary GMP is confirmed. GMP can be multiple contract and it is useful for Procurement of long lead materials and early construction. If the actual cost is lower than expected GMP, sharing of the saving is an option since the conflict of interests between the client and the contractor can occur.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.21 no.1
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• pp.20-23
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• 1976

Distribution of underground organs of perennial weeds in soil and ecological control measure were evaluated. Tubers of Cypers serotinus and Sagittaria pygmaea were mostly presented in a shallow depth of 0 to 5cm, however, Potamogeton distinctus's bulbs and Eleocharis kuroguwai's tubers were distributed in the soil at 10 to 20cm. A 20cm autumn plowing was, to some extent, effective to reduce Potamogeton distinctus. The herbicide, avirosan at 3kg/10a alone, was extremely effective in controlling Potamogeton distinctus.

• Magazine of the Korea Concrete Institute
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• v.9 no.6
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• pp.185-193
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• 1997

본 연구는 각종 제진재료를 이용하여 진동을 억제할 수 있는 콘크리트를 개발하여 각종 건설공사에서 흔히 발생할 수 있는 진동공해문제를 억제하고자 하며 아울러 폐기물의 재활용차원에서 폐자재를 이용하여 유용한 제진콘크리트를 개발하고자 하는데 그 목적이 있다. 우선, 제진재료를 이용한 압축강도 (200kg/$\textrm{cm}^2$)이상의 콘크리트 배합비를 찾기 위하여 24배치의 예비실험을 수행하였으며, 선정된 적정배합비에 따른 제진재료를 이용한9개의 진동시험체보를 제작하여 보의 구조적 및 재료적 동적특성 즉 1차 공명진동수와 동적 휨강성 및 감쇠비를 측정하여 제진효과를 조사하였다. 그리고 압축강도에 의한 각 시험체의 균열모멘트를 추정하여 재하하중과 균열모멘트비(M/Mcr)에 따른 하중단계별 동적특성값을 살펴보았다. 제진재료로서는 라텍스(Latex), 고무분말(Rubber Powder)그리고 플라스틱 레진( Plastic Resin)등을 사용하였고, 재료적, 구조적 진동감쇠효과를 파악하고자 KS F2437규정과 진동파의 속도법을 사용하였으며, 감쇠비 측정은 Frequency Spectrum 곡선에 대한 Polynomial Curvefitting 방법과 기하학적 해석방법을 이용하여 각각의 결과를 비교.분석하였다.

• Korean Journal of Optics and Photonics
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• v.4 no.1
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• pp.57-65
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• 1993

Small XeCl laser of charge transfer discharge excitation was fabricated and output charateristics were investigated according to gas mixture ratio. Beam cross section of 2.7cm${\times}$1.5cm was obtained by constructing excimer laser which preionization is operated automatically and which has chang profile electrode. According to the component gas mixture ratio, the condition of maximum output energy, efficiency were investigated. The maximum energy, efficiency and specific energy were obtained 230 mJ, 1.6% and 1.1 J/l, respectively. The long pulse effect is observed by constructing low peaking to main capacitance ratio of 1:3.

• Progress in Medical Physics
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• v.13 no.1
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• pp.32-36
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• 2002

For Intensity Modulated Radiation Therapy(IMRT), the spatial resolution of intensity map(IM) is limited by the width of multi-leaf collimator, which would make an effect on the conformity of the target, as well as organs at risk. Several Methods are suggested to increase the spatial resolution, which can be categorized by the hardware-dependent technique and the software-based technique. However the best solution might be to make the width of MLC finer. it has several obstacles in the respects of technical difficulty and cost. This preliminary study is designed to investigate the clinical effectiveness of the virtual-micro IMRT(VMIMRT) technique, one of the software-based technique. A particular intensity map was created, which has 42$\times$54 pixel dimension ,0.5cm pixel size and 15 intensity levels. Using this intensity map, segment fields of IMRT were generated with 1$\times$lcm, 0.5$\times$1cm, 0.5$\times$0.5cm(VMIM) beamlet size, respectively As results, we found that there was no evidence of improvement for VMIMRT, compared with the 0.5$\times$lcm beamlet size which can be delivered by 1cm width MLC. The reason seems to be due to the constraint of VMIMRT. Further study is required to prove the benefit of the VIMRT in clinical case like head and neck cancer, where is expected that higher resolution than 1cm is necessary.

• Korean Journal of Ichthyology
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• v.23 no.1
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• pp.75-79
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• 2011

This study was conducted to investigate protocol standardization for cryopreservation spermatozoa of the bar-tailed flathead Platycephalus indicus. The suitability of the cryoprotectants, dimethyl sulphoxide (DMSO), glycerol and methanol were tested against three freezing rates and three thawing temperatures. DMSO and glycerol gave significantly higher motile index and survival rates than methanol. Among the freezing rates, freezing at a height of 2 cm above $LN_2$ surface for $10\;min^{-1}$ gave higher motile index and survival rates. In terms of best thawing temperature, $20^{\circ}C$ obtained the highest motility.

• Journal of Conservation Science
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• v.29 no.4
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• pp.321-332
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• 2013

Namwon Singyeri Maaeyeoraejwasang (Rock-Carved Seated Buddha Statue) is composed mainly foliated granite and is different metamorphic grade and weathering degree on rock location. As the results of deterioration evaluation, upper part of the buddha statue was estimated that granularity decomposition was serious and rock strength was lower than lower part. Furthermore organism assessed most effect of among weathering factors. Chl. a amount of organism species were calculated $0.2{\mu}g/cm^2$ of crustaceous lichen, $1.1{\mu}g/cm^2$ of foliose lichen, $2.3{\mu}g/cm^2$ of bryophyte. Organism was taken treatment in order of amount of Chl. a and pre-cleaning, dry cleaning, wet cleaning in sequence. It should be establish conservation plan that strengthening in consideration of lithology characteristics and setting in good condition environment to conserve long-term of Maaeyeoraejwasang.

• Journal of the Korean Society of Food Science and Nutrition
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• v.15 no.3
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• pp.213-221
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• 1986

Japanese spotted mackerels(Scomber tapeinoephalus) were stored at $0^{\circ}C$ for 7days as the maximum, and then, they were stored again at $-3.5^{\circ}C$(partial freezing) or $-20^{\circ}C$(freezing), respectively. During storage by partial freezing, the fishes with a longer period of prestorage at $0^{\circ}C$ showed an earlier increase in the number of bacterial cells on their skin, however, it was not apparent in the freezing storage. K value of the fishes with 7 days of prestorage increased from 20% to 65.4% for 36 days of partial freezing storage, that of the fishes prestored for 0 and 4 days were 39.9% and 53.2% respectively. On contrastly, no drastic increase in K value was observed in the fishes of freezing storage. Content of volatile nitrogen of the fish muscle prestored for 4 days gradually increased from 10mg% to 29.4mg% and 17.2mg% during 36 days of partial freezing and 83 days of freezing storage respectively, that of the fishes with 7 days of prestorage showed no significant increase, moreover, it was decreased within early period of both of the storages. Free drip from the fishes with partial fleering was higher almost 5 times than that from the fishes with freezing, the highest free drip was observed from the fishes with 4 days of prestorage.

• Journal of Chest Surgery
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• v.29 no.3
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• pp.255-262
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• 1996

The donor pool for heart transplants is severely limited and there is still a legal problem of brain death. This study assessed the function of hearts "absolute anoxic" for ten minutes after asphyxia by perfusing the hearts on a Langendorfr apparatus for 45 minutes with Krebs-Henseleit buffier at 37 t at 80 cm H2O. Forty isolated rat hearts were divided into four groups. Ten control hearts (group 1) were perfused on the circuit without intervening ischemia. Ten hearts (group 2) were harvested, quickly flushed with 5cc of cold University of Wisconsin solution, and stored in the same cold solution for 4 hours. Ten hearts (group 3) were excised, quickly flushed with 5 u of cold Stanford cardioplegic solution and stored in cold saline solution for 4 hours. Ten asphyxiated hearts (group 4) had warm ischemia for ten minutes and were perfused with 5u of cold Stanford cardioplegia containing 7,500 units of urokinase to dissolve intravascular clots, and stored in cold saline solution for 1.5 hours. Time of spontaneous defibrillation (TSD) after perfusion was significantly longer in group 2, group 3 and group 4 than in group 1. TSD in group 3 and group 4 was significantly longer in comparison to that of group 2. Left ventricular developed pressure(LVDP) at 15 minutes was significantly lower in group 3 and group 4 than in group 1 and group 2. In group 4, LVDP at 30 minutes and 45 minutes was significantly lower compared with that in group 1 . In conclusion, asphyxiated rat hear;ts which had absolute anoxia for 10 minutes after as hyxia showed relatively satisfactory cardiac function. function.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 2002.04a
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• pp.262-262
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• 2002

2001년 12월과 2002년 1월에 걸쳐 조간대 환경에 위치하는 어느 해양사격장 중위에서 일정한 간격으로 표층(<5 cm) 해양퇴적물(총22개소)과 해양생물체(굴; 총10개소)를 샘플링하고, Pb, Cu, Cd, Zn를 위시한 중금속원소의 공간적 농도 분포와 생흡수도(bioavailability)를 분석 고찰하였다. 본 논문에서는 예비 연구 결과를 간단히 소개한다. 해양퇴적물에 대한 전함량 분석, 0.1N HCl에 의한 부분 분석 및 BCR법에 의한 연속추출 분석 결과는 다음과 같다. Pb, Cu, Cd, Zn을 위시한 중금속은 대체적으로 점오염원인 사격장으로 갈수록 전함량 및 부분함량이 높아지는 경향을 보여주었다. 사격장 주변에서 가장 중요한 오염물질로 알려져 있는 Pb는 오염원 주변에서만 높은 함량을 보여주어, 해양 환경 하에서 이동도( 및 생흡수도)가 비교적 낮은 것으로 나타났다. 반면, Cu, Cd, Zn의 경우에는 보다 넓은 영역에 걸쳐 퇴적물 내의 부화(enrichment)가 인지되어 연구지역의 갯벌 환경에 의미있는 정도로 영향을 미치고 있는 것으로 나타났다. 이 곳의 생물체(굴) 역시 Pb에 대해서는 낮은 흡수도(-값의 생농축계수)를 나타낸 반면, Cu, Cd, Zn에 대해서는 의미있는 생흡수도를 나타내었다. BCR 연속추출법에 의한 퇴적물 중금속의 존재형태 해석 결과를 보면, fraction 1(F1; exchangeable+acidic phase) 및 fraction 2(F2; reducible phase)의 기여도가 지배적이고, 또한 오염원으로 갈수록 그 기여도는 점차 증가됨을 나타내었다. 특이하게도 유기물과의 친화력이 높은 것으로 알려진 Cu 역시 F1과 F2에 대하여 높은 함량을 나타내어 오염원으로부터의 Cu의 확산을 지시하였다. 외국에 비하여, 그동안 국내에서는 사격장 주변의 자연환경변화에 관하여 연구된 결과가 거의 전무하였다. 본 연구 결과는, 이와 유사한 사격장 주변 환경에서의 중금속 분포와 거동 특성에 대하여 종합적인 모니터링(즉, 체계적인 환경지구화학적 조사ㆍ연구)이 시급함을 시사해 주고 있다.