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      • 공구형상이 칩유동에 미치는 영향에 관한 연구

        김경우,김우순,윤주식,채왕석,김동현 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

        A new methodology is presented to evaluate material properties at high strain rates and high temperatures based on orthogonal metal cutting experiments and FEM simulations. Average strain rate and average temperature found in the deformation zone are computed and flow stress data at these conditions are modified until cutting forces calculated in simulations match those determined in experiments. Material properties obtained from this method were verified by additional metal cutting simulations. Derivation from cutting forces measured in experiments was less than 10%. The feasibility of tool design using FEM simulations is also demonstrated.

      • KCI등재후보

        뇌수술 시 과호흡과 만니톨의 투여가 뇌혈류와 뇌산소대사에 미치는 영향

        김지헌,김경식,문봉기,조경기,신용삼,이영주,김진수 대한마취과학회 2002 Korean Journal of Anesthesiology Vol.43 No.4

        Background: There are therapies to lower intracranial pressure (ICP) including head elevation, hyperventilation, diuretics injection, intravenous mannitol, hypothermia, cerebrospinal fluid drainage, and cerebral resection in neurosurgical patients. However in recent reports, hyperventilation followed by mannitol administration may lead to cerebral ischemia. Therefore, we investigated the effect of 0.5-1.0 g/kg mannitol administration on jugular venous oxygen saturation (SjVO_2) and cerebral arterial-jugular venous oxygen content difference (AVDO_2) at PaCO_2 25-30 mmHg and 35-40 mmHg in patients undergoing neurosurgery. Methods: we studied 17 patients undergoing neurosurgery in the Ajou University Hospital. Anesthesia was induced with fentanyl, midazolam, thiopental, and vecuronium, and maintained with )_2-Air-Isoflorane, a continuous infusion of fentanyl, and vecuronium. Patients were divided into two groups. Group 1 (n = 10) which is PaCO_2 25-30 mmHg and Group 2 (n = 7) which is PaCO_2 35-40 mmHg by controlling ventilator. Measurements of SjVO_2 and AVDO_2 in following time intervals: Ⅰ = preinjection of mannitol, Ⅱ = postinjection 20 minutes of mannitol, Ⅲ = postinjection 40 minutes of mannitol were obtainde for each group. 0.5-1.0 g/kg mannitol was administered intravenously just at duramater opening. Results: Hemodynamics and hematologics were not significantly different among the two groups. SjVO_2 of each group are as follows; Group 1; Ⅰ (70.3 ± 8.1%), Ⅱ (66.3 ± 6.9%), Ⅲ (69.1 ± 7.9%) and Group 2; Ⅰ (78.6 ± 7.4%), Ⅱ (75.1 ± 8.1%), Ⅲ (76.0 ± 11.2%), Hyperventilation significantly decreased SjVO_2- AVDO_2 was not significantly different but SjVO_2 in Ⅱ was significantly decreased compared with Ⅰ and Ⅲ in Group 1 (20% patients). Conclusions: Mannitol produced a change of SjVO_2 during hyterventilation. Therefore, intravenous mannitol during hyperventilation should be given cautiously according to the patients status because it may cause cerebral ischemia in critical patients. (Korean J Anesthediol 2002; 43: 462~467)

      • KCI등재후보

        변위매복된 상악전치의 자가이식을 통한 자발적 맹출 유도

        김재곤,이두철,오경선,백병주 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.2

        매복치아의 치료는 단순한 관찰에서 외과적 노출후 교정적 견인까지 매우 다양하며, 매복치의 위치 이상이 심한 경우에는 자가이식을 고려한다. 치아의 자가이식술은 맹출되었거나, 매복치아, 변위맹출된 치아 혹은 기능을 못하는 치아를 동일한 개체의 구강내에서 기존의 발치와나 외과적으로 형성한 수용부에 재위치시키는 술식을 의미한다. 자가이식할 치아는 치근장의 ½∼¾ 정도의 치근 발육시기가 치아가 쉽게 발거되고, 합병증이 적게 생기며, 치근의 최종길이가 충분하게 발육한다. 치근 미완성 치아 이식은 무조건 근관치료 하지 않고, 대부분 치수치유를 목표로 하게 된다. 본 증례는 구순열 부위의 과잉치와 함께 상악 우측 중절치의 맹출지연을 주소로 본원에 내원한 환아로, 방사선사진상 상악 우측 중절치와 측절치의 변위매복을 발견하였으며, 치은내 자가이식술을 시행하여 자발적 맹출을 유도, 정상적 치근발육 및 맹출 후 치열의 양호한 배열을 얻을 수 있었다. The treatment method of impacted tooth is various from simple observation to surgical exposure and orthodontic methods, autotransplantation is concerned to severe malposed impacted tooth Autotransplantation is the transplantation of embedded, impacted, of unerupted tooth, into extraction socket of surgically prepared in the safe individual Autotransplantation of tooth with ½∼¾ root development provldes a good chance of easily extracted, a littte complication, pulp survival, and complete root formation. Transplantation of uncompleted root apex tooth is aim to pulpal healing, not endodontic treatment. The case which were treated with autotransplantation is reported, and induced normal physiologic eruption and good dental alignment.

      • 강교량의 수요·공급 변동률과 낙찰율 변동 관계 추정모델

        이정훈,김경주 중앙대학교 기술과학연구소 2003 기술과학연구소 논문집 Vol.33 No.-

        1997년 외환위기(IMF)이후 강교량 발주물량은 감소하였으며, 반면 강교량 관련 제작업체의 수는 증가하였다. 이는 강교량의 수요와 공급의 불균형으로 이어져 강교량 하도급단가 하락에 영향을 미치게 되었다. 이러한 요인을 수요와 공급 측면에서 조사 분석하였으며 이를 위해 연도별 하도급단가 변화추이와 공급측면에서의 철강재설치공사업체의 등록추이, 수요측면에서의 교량용 강재소비량, 물가지수와의 관계를 각각 비교하여 이러한 요인들이 강교량 하도급 단가에 미치는 영향과 이들의 상관관계를 조사 및 분석하였다. 그 결과 강교량의 수요와 공급의 불균형은 강교량 하도급단가의 변화에 영향을 미치는 것으로 나타났다. After the Korean economic crisis in 1997, steel bridge contract quality was reduced while the number of factories related to the steel bridge production was increased. It led to the imbalance of the steel bridge supply &emand and affected to the steel bridge subcontract price. This study investigated the dffect contract price in aspect of supply &emand. For this purpose, annual subcontract price change, steel bridge production factory’ number, quantity of steel bridge construction, and the price index were compared respectively and the effect of these components to the subcontract price of steel bridge was analyzed. Analysis shows, the imbalance on supply &emand the steel bridge affects to the subcontract price change.

      • Hepatic venous pressure gradient can predict the development of hepatocellular carcinoma and hyponatremia in decompensated alcoholic cirrhosis

        Kim, Moon Young,Baik, Soon Koo,Yea, Chang Jin,Lee, Il Young,Kim, Hye Jung,Park, Kyong Won,Kim, Hearn Kook,Suk, Ki Tae,Kim, Jae Woo,Kim, Hyun Soo,Kwon, Sang Ok,Cha, Seung Hwan,Kim, Young Ju,Koh, Sang B Lippincott Williams Wilkins, Inc. 2009 European journal of gastroenterology & hepatology Vol.21 No.11

        OBJECTIVE: Portal hypertension is closely associated with serious complications of cirrhosis, which contribute to bad prognosis. Hepatocellular carcinoma (HCC) and low serum sodium (SNa) are manifestations of end-stage liver disease and are associated with poor survival in decompensated cirrhosis patients. We aimed to determine the relationship between hepatic venous pressure gradient (HVPG) and the development of HCC or low SNa in decompensated alcoholic cirrhosis patients. METHODS: Child-Pugh scores, Model for End-Stage Liver Disease scores, and HVPG at baseline, and the development of HCC or low SNa (SNa <130 mEq/l) during follow-up were analyzed prospectively in 170 patients with decompensated alcoholic cirrhosis from December 1999 to January 2008 (mean follow-up period of 33.9±27.9 months). The predictive value of different risk factors for the development of HCC and low SNa and survival were investigated. RESULTS: Twenty-four patients developed HCC during the follow-up period. In the multivariate analysis, only baseline HVPG greater than 15 mmHg was an independent predictive factor for the development of HCC (relative risk=1.128, P<0.05) and which showed a significantly shorter time for the development of HCC on the Kaplan–Meier analysis. Twenty patients developed low SNa during follow-up. Initial HVPG was also an independent predictive factor for the new development of low SNa in the multivariate analysis (relative risk=1.169, P<0.05) and which also showed significantly shorter times for the development of low SNa on the Kaplan–Meier analysis. CONCLUSION: In decompensated alcoholic cirrhosis, HVPG may be a useful predictive factor for the development of HCC and low SNa.

      • KCI등재

        Estimating Hypothetical Competitive Bid Price on Bid-rigged Projects Based on the Weights of Major Work Groups

        Kyong Ju Kim,Deok Soo Kim,Kyoungmin Kim,Eu Wang Kim,신연주 대한토목학회 2024 KSCE Journal of Civil Engineering Vol.28 No.8

        Bid-rigging has long been a problem in the construction area. This research identified the existing problems in evaluating damages from bid-rigging in Design-Bid-Build (DBB) and lowest-bid construction projects. Traditional econometric assessment based on stochastics requires sufficient historical data to obtain reliable estimates. Thus, it is crucial to collect and analyze data from pertinent projects for its utilization. To ensure the accuracy of the estimation, a substantial amount of data on the outcomes of DBB bids should have been gathered. In many construction projects, that requirement could not be met. Furthermore, econometric analysis cannot reflect the differences caused by the details of individual projects. This study proposes an alternative approach based on detailed cost estimates, weights of major work groups and their historical bid rates when historical data from similar projects are scarce. This approach can reflect the distinct characteristics of individual projects. The proposed model was applied to 23 gas pipeline construction projects under DBB and the lowest bid. This study identified the impacts of the different compositions of major work groups. Bid rates of the main work groups could not only be used to evaluate the damages caused by bid-rigging, but could also be used to determine reliable bid prices and provide a bidding strategy to aid the bidder's decision-making process in future bids for similar projects.

      • Dendritic planarity of Purkinje cells is independent of Reelin signaling

        Kim, Jinkyung,Park, Tae-Ju,Kwon, Namseop,Lee, Dongmyeong,Kim, Seunghwan,Kohmura, Yoshiki,Ishikawa, Tetsuya,Kim, Kyong-Tai,Curran, Tom,Je, Jung Ho Springer Berlin Heidelberg 2015 BRAIN STRUCTURE AND FUNCTION Vol.220 No.4

        <P>The dendritic planarity of Purkinje cells is critical for cerebellar circuit formation. In the absence of Crk and CrkL, the Reelin pathway does not function resulting in partial Purkinje cell migration and defective dendritogenesis. However, the relationships among Purkinje cell migration, dendritic development and Reelin signaling have not been clearly delineated. Here, we use synchrotron X-ray microscopy to obtain 3-D images of Golgi-stained Purkinje cell dendrites. Purkinje cells that failed to migrate completely exhibited conical dendrites with abnormal 3-D arborization and reduced dendritic complexity. Furthermore, their spines were fewer in number with a distorted morphology. In contrast, Purkinje cells that migrated successfully displayed planar dendritic and spine morphologies similar to normal cells, despite reduced dendritic complexity. These results indicate that, during cerebellar formation, Purkinje cells migrate into an environment that supports development of dendritic planarity and spine formation. While Reelin signaling is important for the migration process, it does not make a direct major contribution to dendrite formation.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00429-014-0780-2) contains supplementary material, which is available to authorized users.</P>

      • Valuation on the Intangible Benefits of EVMS using CVM

        Kim, Kyong Ju,Kim, Kyoungmin,Kang, Ki Yong Architectural Institute of Japan 2010 JOURNAL OF ASIAN ARCHITECTURE AND BUILDING ENGINEE Vol.9 No.1

        <P>There has been a lot of controversy about whether the return on IT (Information Technology) is adequate. While the number of articles on IT evaluation has been substantial, limited attention has been given to the value of an intangible benefit. This paper aims to suggest an approach to putting a financial estimate on the intangible benefit of IT applications. The authors' chose a sample system for the evaluation and utilized the contingent valuation method to quantitatively measure the intangible value. Then, a valuation and analysis model were suggested for the quantitative valuation of the intangible benefit from IT adoption.</P>

      • SCISCIESCOPUS
      • Preparation of TiO2 nanoparticle from Ti-salt flocculated sludge with dye wastewater.

        Kim, Jong Beom,Park, Hee Ju,Shon, Ho Kyong,Cho, Dong Lyun,Kim, Geon-Joong,Choi, Sung Woo,Kim, Jong-Ho American Scientific Publishers 2010 Journal of Nanoscience and Nanotechnology Vol.10 No.5

        <P>Dye wastewater flocculation using TiCl4 and FeSO4 coagulants was studied for organic removal and precipitation efficiency. Moreover, TiCl4 was assessed in a pilot-scale flocculation process to investigate organic removal and solution pH effect. A large amount of TiO2 was produced from sludge of Ti-salt flocculation in dye wastewater. This flocculation process simultaneously reduces a large amount of sludge produced from wastewater. The TiO2 nanoparticle was characterized in terms of physical and chemical properties. Results showed that 77.6% of organic matter was removed from dye wastewater when using FeSO4 as coagulant, while TiCl4 degraded 75.9% of organic matter. On the other hand, floc precipitation efficiency was better for TiCl4 if compared with FeSO4. The optimum concentration of TiCl4 for pilot-scale flocculation was found to be equal to 2.1 g/L. DWT (Dye wastewater titania) size was 15-20 nm, mainly doped with carbon atoms and exhibited a dominant anatase structure. DWT was similar to P-25 in decomposing acetaldehyde under UV-irradiation and complete photocatalytic degradation was achieved after 140 min.</P>

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