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김종연,윤상구,도준형,최현민,권성욱,남궁준,이성윤,이원로 대한심장학회 2008 Korean Circulation Journal Vol.38 No.3
An anomalous origin of the right coronary artery (RCA) from the left coronary cusp is a rare congenital anomaly. Because of the unusual location and the noncircular luminal orifice of this anomaly, cannulation of this artery during coronary angiography and percutaneous coronary intervention (PCI) poses significant technical difficulties when using the currently available guiding catheters. Primary PCI should be performed as quickly as possible when a patient displays this condition. When we face the situation of an anomalous artery during primary PCI, it takes a much longer time to open the occluded artery. We report here on two cases of successful primary PCI with using manually manipulated catheters and Ikari type guiding catheters in 2 patients who both had an anomalous RCA arising from the left coronary cusp. (Korean Circ J 2008;38:179-183)
김종연,나형용,박희철 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.4
Vibration damping capacity(i.e Specific Damping Capacity, SDC) of extruded bars of both casted and Powder Metallurgy(PM) Al-Zn alloys was investigated in relation to their Zn compositions and heat treatment conditions. The effect of α/β interface area on SDC was studied. The SDC is found to increase with increasing Zn content. The SDC of specimens heat treated at 250℃ for 1 hour is smaller than that of as-extruded bars because their α/β interface area decreases. In the case of extruded bars of PM Al-78wt%Zn alloy heat treated at 250℃ and 310℃ for 1 hour, SDC and lamellar spacing are 12.8% and 0.5㎛, 25.6% and 0.1㎛, respectively. This large difference in SDC is believed due to the disappearance of retained α phase as well as much finer lamellar spacing by heat treating at 310℃. The SDC of extruded bars of PM alloys is about 3% larger than that of extruded bars of casting.
고 Si 구상흑연주철의 조직과 기계적성질에 미치는 Si 과 Mo 의 영향
김종연,나형용 ( Jong Yeon Kim,Hyung Yong Ra ) 한국주조공학회 1990 한국주조공학회지 Vol.10 No.3
N/A Spheroidal graphite cast irons which are Fe-3%C-(4-6)%Si-(0-0.5)%Mo were studied to improve not only heat resistance but also mechanical properties. With increasing Mo content, the graphitization was decreased and carbide volume fraction was increased. The graphite spheroidization ratio was not decreased in Fe-3%C-6%Si-Mo system cast iron with increasing Mo content, but that was decreased in Fe-3%C-4%Si-Mo system and Fe-3%C-5%Si-Mo system cast irons. Hardness was increased with the Si and Mo contents. At constant Si content, tensile strength was increased with increasing Mo content, but that was decreased at 6%Si. In the experiment of oxidation, weight gain was decreased as the Si and/or Mo content increased, but increased at 1.5%Mo content.
추적관찰에 의한 일개 전문계 남자고등학생의 흡연 예측 인자
김종연,박순우,Kim, Jong-Yeon,Park, Soon-Woo 대한예방의학회 2009 예방의학회지 Vol.42 No.1
Objectives : This study was performed using a longitudinal approach to explore the predictors for current smoking among male high school students. Methods : Baseline data was collected in May 2004 through a self-administrated questionnaire completed by 607 male students in a technical high school in Daegu city, Korea. Subsequently, their smoking behaviors were followed one year after. Among the 544 followed participants, data for 439 non-smokers in the first year was used in longitudinal analysis. Current smokers were defined as those respondents who had smoked one or more cigarettes within the 30 days preceding the survey. Several potential predictors for smoking were investigated including smoking history(never, experimental, former smoker), sociodemographic factors, environmental factors, attitudes toward smoking, and behavioral factors. Logistic regression was used to predict smoking with SPSS ver. 12.0. Results : According to multiple logistic regression analysis, those students who were more likely to smoke after one year were former smokers(OR: 2.12, 95% CI=1.01-4.44), current drinkers(OR: 2.55, 95% CI=1.33-4.89), who had four or five smokers among five best friends(OR: 3.43. 95% CI=1.14-10.30). In addition, those who had smokers among family members besides parents or siblings(OR: 1.66, 95% CI=0.92-2.98), exhibited a high level of subjective stress(OR: 1.77, 95% CI=0.96-3.26), or had a very good relationship with friends(OR: 1.93, 95% CI=0.99-3.75) were also more likely to smoke albeit with marginal statistical significance(p<0.1). Conclusions : A smoking prevention program aimed at high school students may be more effective with due consideration of the predictors highlighted in this study. However, further studies with larger sample size and various target populations are necessary to find potential predictors not found in this study but suggested in other longitudinal studies.
개원의사와 개원한의사의 전문직업성, 직무스트레스 및 직업만족도
김종연,강윤식,조용기,이상원,진대구,안순기,천병렬,예민해,감신,Kim, Jong-Yeon,Kang, Yune-Sik,Cho, Yong-Kee,Lee, Sang-Won,Jin, Dae-Gu,Ahn, Soon-Gi,Chun, Byung-Yeol,Yeh, Min-Hae,Kam, Sin 대한예방의학회 2004 예방의학회지 Vol.37 No.1
Objectives : This study was conducted in order to investigate the professionalism, job stress and job satisfaction in western and oriental doctors in Korea. Methods : The authors conducted a survey using a self-administered questionnaire, conducted between August and September, 2001. The study subjects were 457 western doctors and 161 oriental doctors practicing at local clinics in Daegu City. Results : For the professionalism scale, the score for belief in service to the public of western doctors was significantly higher than that of oriental doctors (p<0.05) whereas the scores for sense of calling to the field and feeling of autonomy were higher in oriental doctors (p<0.01). For the job stress scale, the scores for work factor, and clinical responsibility/decision factor of western doctors were significantly higher than those of oriental doctors (p<0.01). Of the western doctors, 59.7% expressed satisfaction with their job as a doctor, 69.5% responded that the role of a doctor was appropriate to their aptitude, and 61.8% answered that they wouldn't consider other kinds of job even if offered. In case of oriental doctors, these responses were 83.1%, 82.5%, and 82.3%, respectively. Conclusions : The job stress scores of western doctors were higher than those of oriental doctors, but the job satisfaction was lower. The reasons for the above results are not clear. Further studies are required to understand the characteristics of job stress and job satisfaction in doctors.
서해연안 조간대에 서식하는 왜풀망둑 (Acanthogobius elongata) 자치어의 먹이생물
김종연,윤종만 한국수산해양교육학회 2019 水産海洋敎育硏究 Vol.31 No.4
To investigate the feeding habits of Acanthogobius elongata juveniles, the gut contents of the juveniles, captured in the intertidal zone of Dodun-ri, Sochon from the end of May to early June 2018, were observed. Feeding incidence of the juveniles increased twice a day, first in the morning and second in the afternoon. The major food items of the juvenils (7.0〜10.5 ㎜ NL) were copepods, amphipods, shrimp larvae and polychaete larvae. These food items held more than 2 percentage in the dry weight of the total food items.
양구 수입천 하류부의 지형 발달- 암석 표면 K-장석 IRSL 매몰연대측정 결과를 기반으로 -
김종연,홍성찬 한국지형학회 2014 한국지형학회지 Vol.21 No.2
양구군 수입천 유역은 지형 연구 및 조사가 상당히 제한되어 온 지역이다. 최근의 DMZ인근 지역 등에 대한 관심의 증가 등으로 인하여 해당 지역의 자연 환경에 대한 이해의 필요성이 증가하고 있다. 이에 따라 본 연구에서는 양구군 방산면 소재지 인근의 현리 구하도와 하류 부분인 낭구미 일대의 하안단구를 대상으로 연구를 진행하여 수입천의 지형 발달 과정을 밝히고자 하였다. 한편 한국 지형 연구에서 하천의 중상류 부를 중심으로 나타나는 자갈 퇴적층에 대한 연대 측정 기법의 개발은 상당히 중요한 과제이다. 수입천 하안단구 자갈 퇴적물에 대하여 K-장석 IRSL기법을 이용하여 연대 측정을 시도하였다. 이 연대 측정 결과들을 기반으로 하여 현리 구하도는 MIS 4후기에서 MIS 3의 시기의 수입천 하도 절단으로 형성된 것으로 나타났으며, 약 69ka 이후의 하각률은 약 0.2mm/yr로 나타났다. 낭구미 지역에는 2단의 단구가 확인되며 상부 단구에는 실트질 퇴적층이 하부 단구에서는 자갈 중심의 퇴적층이 나타난다. 하부 단구에서는 약 124ka의 매몰 연대가, 상부 단구에서는 약 165ka의 매몰 연대 값이 나타났다. 이 매몰 연대 값을 바탕으로 0.2mm/yr의 하각률이 계산되었으며 상류부인 현리 구하도 부분의 하각률과 유사한 것으로 나타났다. 이 하각률은 선행 연구들이 제시한 영서지역 하천의 평균적인 하각률과 유사한 것으로 판단되며, 또한 최근에 이뤄진 빙기 동안의 동해안 융기율과도 근사하는 것으로 판단된다.