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평면형 ECF 펌프의 개발 및 전자기기 액체냉각 시스템에의 응용
서우식(W. S. Seo),함영복(Y. B. Ham),윤소남(S. N. Yun),박중호(J. H. Park),최병오(B. O. Choi) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This paper presents a liquid cooling concept for heat rejection of high power electronic devices existing in notebook computers etc. The design, fabrication, and performance of the thin-planar ECF pump and forced-liquid cooling system are summarized. The thin-planar ECF pump, consists of a pump housing and electrode substrate with overall dimension of 280 ㎜ × 190 ㎜ × 1 ㎜, achieves maximum flow rate and output pressure of 5.5 ㎤/s and 7.1 ㎪, respectively, at an applied voltage of 2.0 kV. The forced-liquid cooling system, constructed with the thin-planar ECF pump, liquid-cooled heat sink, and thermal test chip, removes input power up to 80 W keeping the chip surface temperature below 70 ℃. The experimental results demonstrate that the feasibility of forced-liquid cooling system using ECF is confirmed as an advanced cooling solution on the next-generation high power electronic devices.
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정용현,서우식,유재홍,변상현 충남대학교 의과대학 지역사회의학연구소 1995 충남의대잡지 Vol.22 No.2
For the purpose of assessing the disease patterns by the body organ system in patients of the pediatric age, we performed a statistical analysis of diseases of patients admitted to the department of pediatrics at Chungnam National University Hospital from January 1990 to December 1994. The results obtained were as follows : 1. Total numbers of in-patients were 8,007, of which 4,923 were male and 3,084 were female. The ratio male to female was 1.60 : 1. 2. Prevalence of the diseases classified by body organ system was in the following order : neonatal diseases (34.6%), respiratory diseases (17.4%), infectious diseases (11.5%), congenital anomalies (5.5%), digestive diseases (5.1%), genitourinary diseases (4.9%), neoplasm (4.7%), blood diseases (3.3%), nervous system diseases (2.8%), metabolic and endocrine diseases (2.4%), circulatory system diseases (2.3%), skin and subcutaneous diseases (1.3%), musculoskeletal and connective tissue diseases (1.2%), mental and behavior disorders (0.4%). 3. Major diseases in each body organ system were as follows : 1) infectious diseases : unspecified acute gastroenteritis (35.9%), viral meningitis (10.4%), Rotaviral enteritis (6.8%), sepsis (6.7%), measles (5.8%). 2) neoplasm ; ALL (34.1%), AML (15.8%), Wilms tumor (12.8%), NHL (8.2%), neuroblastoma (5.6%) 3) blood diseases : allergic purpura (24.2%), aplastic anemia (17.1%), ITP (16.4%), iron deficiency anemia (15.8%). 4) metabolic and endocrine diseases : short stature (22.0%), hypocalcemia (13.8%), metabolic acidosis (9.6%), IDDM (6.4%). 5) mental and behavior diseases : neurosis (47.7%), mental retardation (18.2%). 6) Nervous and sensory system diseases : epilepsy (43.2%), cerebral palsy (12.1%), otitis media (9.3%), encephalopathy (6.2%). 7) circulatory system diseases: congestive heart failure (29.2%), dilated cardiomyopathy (8.0%), rheumatic fever (8.0%), mitral insufficiency (6.8%), hypertension (6.4%). 8) respiratory diseases : pneumonia (40.1%), URI (9.6%), acute tonsillitis (9.4%), asthma (8.5%), acute bronchiolitis (8.3%), croup (7.1%), acute bronchitis (4.1%). 9) digestive system diseases : unspecified hepatitis (22.8%), acute gastritis (13.8%). CAH (12.6%), intussusception (7.8%), constipation (7.1%). 10) skin and subcutaneous diseases : cellulitis (23.1%), lymphadenitis (19.7%), urticaria (15.6%), atopic dermatitis (8.8%), furuncle (8.2%). 11) musculoskeletal and connective tissue diseases : Kawasaki disease (76.8%), JRA (8.5%), SLE (7.0%). 12) genitourinary system diseases : UTI (29.0%), minimal change nephrotic syndrome (27.3%), APSGN (7.6%), APN (4.9%). 13) congenital or chromosomal abnormalities : VSD (38.7%), ASD (10.5%), TOF (8.4%), PDA (5.2%), CHPS (4.5%), Down syndrome (4.1%). 14) neonatal diseases : jaundice (32.0%), prematurity (12.7%), RDS (5.7%), sepsis (4.5%), birth asphyxia (3.0%), SGA (3.0%). 15) Others : febrile convulsion (45.6%), failure to thrive (9.2%), FUO (8.9%), drug intoxication (8.2%). 4. Common diseases for admission in pediatrics were in the following order : jaundice, pneumonia, unspecified acute gastroenteritis, VSD, RDS, URI, acute tonsillitis, acute lymphadenitis, ALL, sepsis, asthma, acute bronchiolitis, UTI.
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