• Journal of Chest Surgery
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• v.35 no.7
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• pp.523-529
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• 2002

Background: Previous reports present that the early results of coronary artery bypass grafting (CABG) has been improving with the accumulation of surgical experience. We conducted a retrospective analysis of the patients who received CABG to evaluate the recent results of CABG. Material and Method: Between January 1996 and August 2001, 154 patients underwent CABG at Hanyang University Hospital. There were 47 patients(group I) who were operated between 1996 and 1998, and 107 patients(group II) who were operated thereafter. The preoperative diagnosis, operative procedure, mortality, and complications were analyzed retrospectively. Result: There were 35 males and 12 females in group I, and 78 males and 29 females in group II, which shows similar ratio of sexes between the two groups. The average age of patients for group I and group II was $55.9{\pm}6.2$ years and $61.0{\pm}8.0$ years, respectively, showing a significant increase in group II(p<0.05). The average left ventricular ejection fraction(LVEF) for group I and group II was $54.6{\pm}11.8$% and $56.9{\pm}13.0$%, respectively. The number of patients who had previous MI in group I and group II were 13 patients(27.7%) and 14 patients(13.1%), respectively, which shows a significant difference (p<0.05). All procedures were performed using the cardiopulmonary bypass(CPB) and moderate systemic hypothermia. Myocardial protection was achieved using intermittent hypothermic ischemia under ventricular fibrillation state or cold crystalloid cardioplegic solution for most of group I patients, whereas cold blood cardioplegic solution was used for group II patients. The mean CPB times for group I and group II were $149.2{\pm}48.7$ minutes and $113.1{\pm}30.6$ minutes, respectively. The mean aortic cross clamp times for group I and group II were $81.3{\pm}26.5$ minutes $72.2{\pm}23.9$ minutes, respectively. These figures show that CPB and aortic cross clamp times were significantly reduced in group II(p<0.05). The use of the left internal thoracic artery(LITA) was increased from 42%(20/47) for group I to 81% (87/107) for group II. The mean number of grafts also significantly increased from $2.5{\pm}0.6$ for group I to $3.0{\pm}1.1$ for group II(p<0.05). Intra-aortic balloon pump(IABP) was applied in 7 cases in group I and 17 cases in group II. Of these, 28.6%(2/7) and 52.9%(9/17) were broadly applied preoperatively in patients with LVEF<40% or congestive heart failure. The operative mortalities for group I and II were 10.6%(5/47) and 0.9%(1/107), respectively, which shows significant decrease for group II(p.0.05). Conclusion: This report suggest that CABG using CPB can recently be performed more safely in virtue of the accumulation of surgical experience with reduction in CPB and aortic cross clamp times and improved surgical techniques and myocardial protection. And we think that the optimal treatment of patients with left ventricular dysfunction associated with congestive heart failure and the extended application of IABP, especially have contributed to the reduction of operative mortality and morbidity.

• Journal of the Korean Geographical Society
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• v.4
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• pp.55-58
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• 1969

이 글에서는 다음의 내용을 다루었다. 1. 제1기 국제지리학회의 2. 제2기 국제지리학회의 3. I.G.U.와 한국 4. 제21회 국제지리학회의

• The monthly packaging world
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• s.322
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• pp.93-97
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• 2020

(사)한국포장협회(회장 임경호)가 지난해 9월 2일부터 11월 22일까지 총 11주간 진행한 제32기 포장기술관리사(Packaging Professional) 통신교육을 진행한 결과, 57명의 포장기술관리사를 배출했다. 이번 제32기 포장기술관리사 통신교육에서는 손봉철 씨가 총 1백점 만점에 97.5점을 획득해 최고 성적우수자로 선정됐으며, 성안기계(주)의 장양대 과장이 96.5점으로 2등, 세미산업(주)의 이종환 사원이 95.4점으로 3등으로 수료했다. 다음에 제32기 포장기술관리사 우수성적 수료자들로부터 포장기술관리사 통신교육에 대한 견해를 들어보도록 한다.

• Applied Microscopy
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• v.37 no.2
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• pp.73-82
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• 2007

The antennae of millipedes have a prominent function in detecting various types of environmental stimuli. The structural modification of the antennae is closely associated with the degree of sense recognition. Here we study functional morphology of the antennae of the millipede Cawjeekelia pyongana using field emission scanning electron microscope (FESEM). The antennae generally include eight segments, called articles. On the surface of the antennae, there are a variety of sensory receptors which include olfactory and mechanical receptors. We could identify four different types of antennal sensory organs in C. pyongana as follows: apical cone (Ac), trichoid sensilla (Ts), chaetiform sensilla (Cs) and basiconic sensilla (Bs). The most prominent of which is four APs at the 8th article. Both of the Is and the Cs are abundantly observed almost all of the antennal segments. They are long and strong bristles with longitudinal grooves acuminating toward the tip. The Bs is further divided into three subtypes: large basiconic sensilla $(Bs_1)$, small basiconic sensilla $(Bs_2)$ and spiniform basiconic sensilla $(Bs_3)$. The $Bs_1$ is located at the 5th and 6th articles, while the $Bs_2$ and $Bs_3$ can be seen at the 5th and at the 7th article, respectively.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.5
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• pp.335-343
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• 2019

The third stage of the KSLV-II is equipped with the reaction control system that performs three axis-control during non-thrust coasting phase and performs a roll axis control during thrust phase. Toxic propellants such as hydrazine have been used for conventional rocket propulsions, however, recently, more studies have been conducted on the use of non-toxic eco-friendly propellants such as ADN and HAN. Especially, hydrogen peroxide has received a growing focus as an emerging propellant. It is considered an alternative of the toxic propellants because of economic advantage in producing the system, conducting operation test, and evaluation of the test result. In this paper, we describes the design, prototype, testing and evaluation of the test results with the 50 N-level hydrogen peroxide monopropellant thruster system which is currently under development.

• LOGISTICS
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• s.17
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• pp.36-39
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• 2006

현재 대한민국은 물류산업을 이끌어갈 물류전문 컨설턴트가 절실히 필요하다. 글로벌 물류시대를 맞이하여 물류기업뿐만 아니라 각 제조업체도 물류전문가, 특히 글로벌 물류인재에 목말라 하고 있다. (사)한국물류협회(회장:서병륜)는 지난 6월 17일 협회 대강당에서 제2기 물류전문컨설턴트 29명을 배출하면서, 기업체들의 전문인력의 갈증에 조금이나마 해소하고 있다. 명지대학교와 산학협력 프로그램으로 실시되는 물류전문컨설턴트 양성과정은 물류분야 최고의 컨설턴트와 전문 교수진으로 구성하여, 회사 및 업계에서 물류컨설턴트로 활동할 물류지도자를 양성하는 자격 과정이다. 지난해 9월부터 시작한 이 과정은 우수한 강사진과 커리큘럼으로 국내기업으로부터 지대한 관심을 받으며 제1기 과정과 제2기 과정을 성공적으로 마쳤다. 한편, 오는 9월에 실시되는 제3기 과정에는 모집공고가 나오기도 전에 사전신청자가 11명에 이를 정도로 지원자가 급증하고 있다. 이는 교육 과정이 물류 전문가라면 알아야 될 내용들로 짜임새 있게 구성되어 있지만 더욱 중요한 것은 물류업계 전문가들과 인적 Network 구축이 큰 메리트로 작용하고 있다. 제2기 과정을 수료한 LG화학의 오태경부장은 "지금까지 수 많은 교육을 받아 봤고 여러 종류의 모임에도 참여해 봤지만 과거에는 경험해 보지 못한 전혀 색다른 교육 과정을 체험을 하였다."고 말했다.

• Proceedings of the Korean Quaternary Association Conference
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• 2006.06a
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• pp.3-6
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• 2006

• Proceedings of the Korean Quaternary Association Conference
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• 2004.11a
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• pp.35-36
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• 2004

• Proceedings of the Korean Quaternary Association Conference
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• 2006.11a
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• pp.28-29
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• 2006

• Pediatric Infection and Vaccine
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• v.29 no.3
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• pp.131-140
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• 2022

Purpose: Since the coronavirus disease 2019 (COVID-19) pandemic began, new variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) have emerged, and distinct epidemic waves of COVID-19 have occurred for an extended period. This study aimed to analyze the clinical and epidemiological characteristics of children with COVID-19 from the third wave to the middle of the fourth epidemic wave in Korea. Methods: We retrospectively reviewed the medical records of hospitalized patients aged ≤18 years with laboratory-confirmed COVID-19. The study periods were divided into the third wave (from November 13, 2020 to July 6, 2021) and the fourth wave (from July 7 to October 31, 2021). Results: Ninety-three patients were included in the analysis (33 in the third and 60 in the fourth waves). Compared with the third wave, the median age of patients was significantly older during the fourth wave (6.7 vs. 2.8 years, P=0.014). Household contacts was reported in 60.2% of total patients, similar in both periods (69.7 vs. 55.0%, P=0.190). Eighty-one (87.1%) had symptomatic SARS-CoV-2 infection. Among these, 10 (12.3%) had no respiratory symptoms. Anosmia or ageusia were more commonly observed in the fourth epidemic wave (10.7 vs. 34.0%, P=0.032). Most respiratory illness were upper respiratory tract infections (94.4%, 67/71), 4 had pneumonia. The median cycle threshold values (detection threshold, 40) for RNA-dependent RNA polymerase (RdRp) and envelope (E) genes of SARS-CoV-2 were 21.3 and 19.3, respectively. There was no significant difference in viral load during 2 epidemic waves. Conclusions: There were different characteristics during the two epidemic waves of COVID-19.