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Surgical Outcomes of Cor Triatriatum Sinister: A Single-Center Experience
김동희,권보상,김동희,최은석,윤태진,박천수 대한심장혈관흉부외과학회 2022 Journal of Chest Surgery (J Chest Surg) Vol.55 No.2
Background: We investigated surgical outcomes after the surgical repair of cor triatriatum sinister (CTS). Methods: Thirty-two consecutive patients who underwent surgical repair of CTS from 1993 through 2020 were included in this study. The morphological characteristics, clinical features, and surgical outcomes were described and analyzed. Results: The median age and body weight at operation were 9 months (interquartile range [IQR], 3–238 months) and 7.5 kg (IQR, 5.8–49.6 kg), respectively. There were 16 males (50%). According to the modified Lucas classification, type IA (classical CTS) was most common (n=20, 62.5%). Atrial septal defect was associated in 22 patients (68.8%) and anomalous pulmonary venous return in 8 patients (25%). Pulmonary hypertension was preoperatively suspected with a high probability in 18 patients (56.3%). There was 1 early death (3.1%) after emergent membrane excision and hybrid palliation in a high-risk hypoplastic left heart syndrome patient. There were no late deaths. The overall survival rate was 96.9% at 15 years post-repair. No early survivors required reoperation during follow-up. Most survivors (31 of 32 patients, 96.9%) were in New York Heart Association functional class I at a median follow-up of 74 months (IQR, 39–195 months). At the latest echocardiography performed at a median of 42 months (IQR, 6–112 months) after repair, no residual lesion was observed except in 1 patient who had moderate pulmonary hypertension (mean pulmonary arterial pressure of 36 mm Hg). Conclusion: Surgical repair of cor triatriatum could be performed safely and effectively with an extremely low risk of recurrence.
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金東希 건국대학교 1978 學術誌 Vol.22 No.1
In this study, an attempt was made to set up a proper view of teaching materials for physical education as a principal and effective way to the achievement of its aims, through looking into the concept of physical education. By means of investigating the historical changes in the views of teaching materials, and analyzing their natures and units, practical methods of physical education were clearly presented. This study dealt with the processes and causes of the changes and practical and effective methods of instruction in physical education.
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金東希,卞鎬光 건국대학교 1972 學術誌 Vol.13 No.1
In the 20th century, the progress and advance in both of sports skill and records has been watched with great expectation. Such cause and effect depend upon continuance of human volition and laborious work. Since 1975. Korean sports have attained remarkable improvement both in terms of techniques and education through consistent efforts of sports experts and physical education professors. Some sports events have reached the world top level however, there are many events in which Korea is far behind other countries. Specially in foreign cuntries the achieved development of sports skill is not merely by the hard training, but also by study of skills based on the scientific therory and practice along with adoptation application of the scientific method Although we are cognizant of the world developments in the sports science, we have been pouring our utmost efforts in the development of new scientific training methods. Through the scientific study peculiar to our own fundamental conditions. In this paper, the following factors essential to the process of training of players have been investigated : 1.Study of sports science 2.Selection of representative player. 3.Management of representative players physical strength. 4.Management of representative players daily life. 5.Training of representative players. This study has been made with the object of improvement, at the same time, the investigation of present circumstances of sports in Korea, and how to treat sports with scientific theory and practice.
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분무열분해 공정에 의한 코발트 산화물 나노 분체 제조에 미치는 노즐 팁 크기의 영향
김동희,유재근,Kim, Dong Hee,Yu, Jae Keun 한국자원리싸이클링학회 2016 資源 리싸이클링 Vol.25 No.6
The present study was intended to prepare cobalt oxide ($Co_3O_4$) powder of average particle size 50 nm or less by spray pyrolysis reaction using the raw cobalt chloride ($CoCl_2$) solution, in order to identify the change in the nature of the particles according to the change in the nozzle tip size. When the nozzle tip was 1 mm, it turned out that most of the droplets were spherical and the surface showed very tight structure. The average particle size of the finally formed particles was 20-30 nm. When the nozzle tip size was 2 mm, some of the droplets formed were spherical, but a considerable part of them showed severely disrupted form. particles formed showed an average particle size of 30 - 40 nm. For the nozzle tip size of 5 mm, spherical droplets were almost non-existent and most were in badly fragmented state. The tightness of surface structure of the droplets has greatly been reduced compared with other nozzle tip sizes. Average size of the formed particles was about 25 nm. As the nozzle tip size increased from 1 mm to 2 mm and 3 mm, the intensities of the XRD peaks have changed little, but significantly been reduced when the nozzle tip size increased to 5mm. As the nozzle tip size increased from 1 mm to 2 mm, the specific surface area of the particles decreased, but the nozzle tip size increased to 5mm, the specific surface area remarkably increased. 본 연구에서는 코발트 염화물($CoCl_2$) 용액을 원료로 하여 분무열분해 반응에 의하여 평균입도 50 nm 이하의 코발트 산화물($Co_3O_4$) 분말을 제조하였으며 원료용액이 분사되는 노즐 팁의 크기 변화에 따른 입자들의 특성 변화를 파악하였다. 노즐 팁의 크기가 1 mm인 경우에는 형성된 대부분의 액적형태는 구형을 이루고 있으며 표면은 매우 치밀한 조직을 나타내고 있음을 알 수 있었다. 최종 형성된 입자들의 평균입도는 20 ~ 30 nm이었다. 노즐 팁의 크기가 2 mm인 경우에는 형성된 액적형태는 일부는 구형을 이루고 있었지만 상당 부분은 심하게 분열된 형태를 나타내고 있었다. 노즐 팁 크기가 5 mm인 경우에는 구형을 이루는 액적형태는 거의 존재하지 않았으며 거의 대부분 심하게 분열된 상태를 나타내고 있었다. 액적형태의 표면조직은 다른 노즐 팁 경우에 비하여 치밀함이 크게 감소하였다. 형성된 입자들의 평균입도는 약 25 nm이었다. 노즐 팁 크기가 1 mm로부터 2 mm 및 3 mm로 증가함에 따라 XRD 피크들의 강도는 거의 변화가 없는 반면 노즐 팁 크기가 5 mm로 증가되는 경우에는 피크의 강도가 현저히 감소하게 되었다. 노즐 팁 크기가 1 mm로부터 2 mm 로 증가함에 따라 입자들의 비표면적은 감소하였으며 5 mm로 증가되는 경우에는 비표면적이 현저히 증가하였다.
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김동희 嶺南大學校 工業技術硏究所 1991 연구보고 Vol.19 No.2
This paper is proposes a new current-voltage source hybrid type High-Frequency inverter circuit topology by introducing mainly the effect of the voltage clamping diode in the circuit into the current voltage source hybrid type High-Frequency type inverter as the voltage-fed type High-Frequency thyristor inverter. Concerning the proposed High-frequency inverter, it applies the normalized parameter to the characteristic analysis of steady-state at the time of resistive load. In addition, it induces High-Frequency thyristor inverter with the proposed one, and the relativity of the two on the basis secured results of the characteristic analysis.
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