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이동화,박영철,이민래,이동화,이규창 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.1
형상기억복합재료를 제조하기 위하여 핫프레스 방법을 이용하여 최적의 제조조건을 도출하였으며 냉간압연에 의해 기지재와 강화재의 계면접합을 강화하여 강도를 증가시켰다. 이러한 방법에 의해 제조된 형상기억복합재료에 대하여 외부 하중에 의한 손상정도와 균열의 발생을 감지하여 균열 발생 및 진전을 억제하는 온라인 모니터링 시스템을 개발하고자 한다. 이를 위하여 음향방출 신호의 파라미터를 이용하여 손상에 따른 최적의 AE 파라미터를 도출하였으며 가열시스템을 이용하여 형상기억합금을 가열함으로써 형상기억합금의 수축에 의한 복합재료 내부에 균열진전을 억제시키는 시스템을 개발하였다. A hot press method was use for the optimal manufacturing condition for a shape memory alloy(SMA) composite. The bonding between the matrix and the reinforcement within the SMA composite by the hot press mothod was strengthened by cold rolling. In this study, the objective was to develop an on-line monitoring system for the prevention of the crack initiation and propagation by shape memory effect of SMA composite. Shape memory effect was used to prevent the SMA composite from cracking. For the system to be developed, an optimal AE parameter should be determined based on the degree of damage and crack initiation. When the SMA composite was heated by the plate heater attached at the composite, the propagating cracks appeared to be controlled by the compressive force of SMA.
이동화,임정아,김정희,곽수헌,최성희,장학철 대한내분비학회 2021 Endocrinology and metabolism Vol.36 No.1
Background: The influence of serial changes of adipokines on maternal glucose metabolism from pregnancy to postpartum periods in women with previous gestational diabetes mellitus (pGDM) has not been thoroughly explored. We tried to examine the relationship between the serial changes of adipokines and the development of diabetes mellitus (DM) in women with pGDM. Methods: We longitudinally measured following adipokines: high molecular weight (HMW) adiponectin, retinol-binding protein-4 (RBP-4), lipocalin-2, and chemerin, during pregnancy, and at 2 months and 3 years after delivery. Based on glucose status at postpartum 3 years, we divided into three groups: normal glucose tolerance (GDM-NGT, n=20), impaired glucose tolerance (GDM-IGT, n=23), and GDM-DM (n=22). We analyzed the correlations between adipokines and various metabolic parameters. Results: Plasma HMW adiponectin levels were not different among the three groups during pregnancy. However, HMW adiponectin levels increased at 3 years after the delivery in women with GDM-NGT compared with women with GDM-DM. In the GDM-IGT group, HMW adiponectin levels increased at 2 months postpartum compared to pregnancy period. In contrast, HMW adiponectin levels showed no alternation after parturition in women with GDM-DM. HMW adiponectin was negatively correlated with body mass index and a homeostasis model assessment of insulin resistance. Other adipokines such as RBP-4, lipocalin-2, and chemerin neither showed any differences among the groups nor any significant correlations with 3 years postpartum status of glucose intolerance. Conclusion: Serial changes of HMW adiponectin are associated with the maintenance of glucose metabolism in women with pGDM after delivery.
이동화,이상윤 한국해양수산개발원 2019 해양정책연구 Vol.34 No.2
본 연구에서는 국제해운산업에 중요한 영향을 미치는 변화요인이 무엇인지를 파악하고 각 변화요인에 대해 해운선사들이 체감하는 상대적 중요도를 분석하고자 하였다. 이를 위해 국내외 해운·물류관련 학술지(Journal)에 게재된 논문들이 다루고 있는 해운환경변화 요인들을 텍스트 마이닝 기법과 토픽 모델링 기법을 사용하여 추출 및 구조화하고, 대분류 및 세분류 요인들에 대해 해운기업들이 부여하는 상대적 중요도를 계층적 의사결정 기법(Analytic Hierarchy Process, AHP)을 적용하여 정량화하고자 하였다. 20개 국적선사를 대상으로 설문조사를 수행하여 획득한 자료에 대해 AHP 기법을 적용하여 해운환경 변화요인 간 상대적 중요도를 측정한 결과 기술적 요구(4차산업혁명 기술적용, 자율운항 선박 도입)와 경쟁적 측면(인수합병, 보호무역주의 확산)의 환경변화요인들에 대한 중요성은 높게 나타난데 비해 국제해사기구의 환경적 규제에 대한 중요성은 상대적으로 낮게 평가되었다. 본 연구의 결과는 향후 해운정책이 보다 거시적이고 포괄적인 영역에서 이루어져야 함을 시사한다. The purpose of this study is to identify the factors that cause the changes in the international maritime transport environment and to analyze the relative importance of each factors. To this end, an analytic process was designed to extract and structure the ‘change factors’ in the shipping environment covered by domestic and international academic research papers using text mining and topical modeling techniques, and to quantify the relative importance that shipping companies attach to each factor by applying the Analytic Hierarchy Process(AHP). The analysis result reveals higher importance for the technical demands(applications of the 4th Industrial Revolution technologies, introduction of autonomous vessels) and competitive aspects(mergers and acquisitions, spread of protectionism), while presents relatively lower weight for the IMO’s environmental regulations(reduction of SOX and CO2 emission). The results of this study suggest that future shipping policies should be in a more macro and comprehensive area.
이동화,김진홍,이준성,문철,원종호,조성원,심찬섭,최태명 대한내과학회 1989 대한내과학회지 Vol.36 No.1
Hepatic solitary tuberculoma is an extremely uncommon condition. However it is found frequently with the use of liver biopsy. On the other hand, although miliary tuberculosis of the liver occurs more often than the localized form, the incidence has been decreasex with the introduction of modern treatment for tuberculosis. A 36-year-old man presented to us with a history of low grade fever, anorexia, and ascites. The chest X-ray showed plural effusion on the left side. A technetiumsulfur colloid liver scan demonstrated a well defined filling defect in the right lobe of the liver. The ultrasonogram and computed tomogram of the liver showed a well defined solid mass in the right lobe. Fine needle aspiration of the mass showed necrotic material and normal hepatocytes. The laparotomy revealed a solitary tuberculoma. The liver biopsy showed a large amount of caseation necrosis bordered by epithelioid cell granulomas characteristic of tuberculosis. Acid-fast bacilli were demonstrated in the biopsy material.
이동화,조성원,심찬섭,오상권,유희,박금민 대한소화기내시경학회 1985 Clinical Endoscopy Vol.5 No.1
A 46-year-old female was admitted to Soon Chun Hyang University hospital with a complaint of intermittent epigastric pain. X-ray and endoscopic pictures showed diffase irregular shallow depression which is similar to the macroscopic pattern of the type IIc early gastric cancer. But endoseopic biopsy showed no malignant cell infiltration. Hndoaeopic biopsy plays an important role in excluding the possibility of carcinoma. But operation shoud be considered inspite of biopsy result because malignant lymphoma ean not be completely ruled out. Histopathologic diagnosis was pseudolymphoma of stomach.