TDLAS 시스템을 이용한 유해 배기가스의 농도 계측

차학주(Hak-Joo Cha),김민수(Min-Soo Kim),신명철(Myung-Chul Shin),김세원(Se-Won Kim),전광민(Kwang-Min Chun) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11

Recent advances in room-tempemtun:, visible and near-IR diode laser sources for tclecomnlllnication, optical data storage applications are enabling combustion diagnostics systcm based on diode laser absorption spectroscopy. In contrast to some tradilional sampling-based gas-sensing instmments, tunable diode laser absorption spectroscopy syslem is ad,'antageous because of their non-invash'e nature. high sensitivity, fast response time and real-time measurement capability. So. combined with fiber-optics and high scnsitive dctcction strategies. compact and ponablc sensor system are now appearing for a ,'aricly of applications. The objective of Ihis research is 10 take advanlage of distribuled fccd-back diode lascr and mcasure the co, conccntration (by using dircct absorption and wa,'elcngth modulation spectroscopy methods). In addition to survey spectra of co, bands and spectroscopic parameters bctween 1565 and 1579 nm were computed at tcmperatures between 296 and 1200 K (by using HITRAN 2000 databasc), II expellmcntally fouud oul Ih.1t the fC:ltufes of direct absorplion and wavelength modulation spectroscopy methods.

한국인의 이상혈색소 α-chain에 관한 연구

차학주,김창세 순천향대학교 1992 논문집 Vol.14 No.4

An abnormal hemoglobin, α-chain anomaly, propositus choi, was found at the Chunan Soonchunhyang Univerity Hospital. The abnormal α-chain was separated by following procedures: At first column electrofocusing was performed as a preparative means because it was removed the minor components of hemoglobins. The globin was obtained for removing the heme by acid-acetone, and for obtaining abnormal α-chain CM-cellulose chromatography was carried out. The separated abnormal α-globin was hydrolyzed by an acid and then measured the amino acid contents by Waters amino acid analyzer and the following results were obtained: No. of asp residues is 12,glu 5,ser 11,gly 7,his 10,arg 4,thr 9,ala 21,pro 7,tyr 4,val 13,met 2,cys 1,leu 17,phe 7,and lys 11. On the bases of the above results it was assumed that the abnormal α-globin, propositus choi, was resulted in sustitution of amino acid arg for leu.

이상혈색소에 관한 연구 : 아미노산 조성을 중심으로

車學柱,金昌世 순천향대학교 1987 논문집 Vol.10 No.1

The abnormal b-globin of propositus(Hwang, 18 years old, boy) was purified by urea CM cellulose column chromatography and then identified by urea-polyacetate membrane electrophoresis. The purified abnormal b-globin was analyzed by alpha plus amino acid analyzer and the following results were obtained : No of gly residues is 13, ala 15, val 18, leu 18, ser 5, thr 7, asp 18, glu 11, arg 4, lys 10, his 9, pro 7, phe 7, tyr 2 and met 1. On the bases of the above results it was assumed that the abnormal b-globin, propositus Hwang, was resulted in substitution of amino acid arg for lys.

Intake Manifold에서의 Carbon Deposit 생성원인 규명 및 저감방안에 관한 연구

차학주(Hakjoo Cha),김주일(Jooil Kim),진교승(Kyoseung Jin),박희경(Heekyung Park) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1

During the lifetime of an internal combustion engine. carbon deposits are formed at various locations. In diesel engines. especially carbon deposits in intake manifold leads to an increase in the emission. Moreover durability problems and deterioration of engine efficiency can also arise. A detailed theory on the mechanisms of carbon deposit formation, considering the physical and chemical effects, is presented. In this study, computational fluid dynamics(CFD) was performed to investigate the effect of EGR gas to accumulation of carbon deposits according to different configuration of intake manifold. From these investigations. deposit phenomena. deposit compositions, and countermeasure of deposit reduction in intake manifold will be demonstrated. By understanding how deposits are formed and which the influencing parameters are. this knowledge can be transferred to different locations in the intake systems.

다이오드 레이저를 이용한 연소진단기법

차학주(Hak-Joo Cha),김민수(Min-Soo Kim),신명철(Myung-Chul Shin),김세원(Se-Won Kim),김혁주(Hyuck-Joo Kim),한재원(Jae-Won Han) 한국연소학회 2003 KOSCOSYMPOSIUM논문집 Vol.- No.-

수막뇌염을 동반한 Mycoplasma 폐 렴 2례

이동환,차학주,조명구,최석민,이상주 순천향대학교 1990 논문집 Vol.13 No.3

Mycoplasma Pneumoniae is a main respiratory pathogen in children and young adults. But, M.Pneumoniae infection may also invlove other organ systems. Clinical manifestations of Mycoplasma infection include pneumonia, hemolytic anemia, myocarditis, pericarditis, hepatitis, pancreatitis and arthritis. And many CNS manifestations have been descrived, including meningitis, meningoencephalitis, cerebellar syndorme, peripheral and cranial neuropathy, cerebral infarction, hydrocephalus, poliomyelitis like syndorme, transverse myelitis, psychosis and Guillain-Barre syndrome. We experienced two cases of meningoencephalitis associated with M. pneumoniae in 6-year old girl and 12-year old boy. There were strong positive reaction with cold agglutinin and M. pneumoniae antibody titer in both of them.

Cryptococcosis 2례 : Meningitis 1례 및 Meningeal Sing을 동반하지 않은 Subacute Disseminated Cryptococcosis 1례 A Case of Cryptococcal Meningitis and a Case of Subacute Disseminated Cryptococcosis without Meningeal sign

김병태,박희주,양승하,차학주,박상철,김영창 순천향대학교 1989 논문집 Vol.12 No.1

Cryptococosis is a subacute or chronic mycotic infection caused by Cryptococcus neoformans. We experienced 2 cases of cryptococosis which were diagnosed by Indian-ink stain and culture of cerebrospinal fluid, and biopsy of cervical lymph nodes. Both cases were treated with Amphotericin-B and 5-Jluorocytosine and the results were good. With a brief review of literature, we resented two cases of cryptococosis.

소아에서 발생된 후복막강 지방육종 1례

민용식,조대현,김병태,차학주,이상주,양승하 순천향대학교 1992 논문집 Vol.15 No.4

Liposarcoma, the most common retroperitoneal soft tissue malignant tumor in adults, is an infrequent but well characterized tumor in children. The rare occurence of this tumor in patients younger than 18 years of age has resulted in a lack of accurate descriptions of natural history and methods of management in children. Pediatric liposarcoma is characterized by (1) peak incidence during infancy and in early adolescence (2) th extremities to be the most common site of origin (3) a predominance of myxoid histology and (4) lower overall recurrence rate when compared with adult cases Herein we report a case of liposarcoma which developed at retroperitoneum and mesentery in 2 years and 10 month-old male patient with a brief review of the literatures.

태변 착색아의 임상 통계적 관찰

김영창,김종복,박상철,차학주,이동환,김병태,이상주 순천향대학교 1992 논문집 Vol.15 No.4

Among the total of 3985 newborns delivered at Soonchunhyang University Hospital fron January 1990 to December 1991, a clinical study on meconium stained babies was performed The results are summerized as follows: 1) The incidence of meconium staining was 9.6% (384 cases) in total 3985 newborns. 2) In the groups that the birth weight is below 2500gm, 2501-4000 gm and up to 4001 gm, the incidence of meconium staining was 6.5%, 10.1% and 6.1%. 3) As the gestational age increased, the incidence of meconium staining was higher, 10.0% in those during 38-42weeks, 4.5% in those less than 37weeks and 23.5% in those over 42weeks. 4) The difference of both mean 1 and 5-minute Apgar scores between the meconium and the non-meconium group was significant. 5) The incidence of meconium stained babies was more higher in the group of over 41 year and below 20 year of maternal age than other maternal age and was more prevalent in primipara (12.0%) than multipara(5.8%) . 6) The incidence of meconium staining by mode of delivery was 11.2% in spontaneous vaginal delivery group, 7.1% in the cesarean section delivery group and 1.9% in the breech delivery group. 7) The peripheral blood examination was performed of meconium stained baby, the mean Hb was 18.2±2.5g/dl, the mean WBC count was (20.4±6.8) ×10㎣, the mean nucleated RBC count was 1.6±0.5/100WBC. The positive rate of blood culture was zero. 8) Among the factors of pregnancies or maternal problems, Preeclampsia, Eclampsia, Premature rupture of membrane and Cephalopelvic disproportion were the most risk factors which were associated with meconium staining. 9) The incidence of fetal distress was 26.3% in the meconium stained group compared to 6.1% in the non-meconium stained. 10) There was no difference in neonatal death between the meconium (1.2%) and non-meconium stained group (1.3%).

상염색체 우성 이영양성 표피수포증 1례

박상철,김병태,김종복,차학주,이종석,김창진 순천향대학교 1992 논문집 Vol.15 No.2

Epidermolysis bullosa is a rare hereditary skin disease, in which slight trauma disrupts the cohesion between the epidermis and the derims, resulting in the formation of vesicles, bullae and ulcers. The case presented in this report is epidermolysis bullosa dystrophica type, Which is transmitted by an autosomal dominant gene and has been familial history, which onset was at or shortly after birth. Widespread bullae follow very minor trauma, affecting both skin and mucosa and heal with excessive scarring. The treatment was done by the dropping of oxoline and wet betadine gauze application along with the administration of vit E and phenytoin. Therefore the incidence and size of bullae were much decreased. We report a 1 day old male neonate with epidermolysis bullosa dystrophica, which is transmitted by autosomal dominant gene and has been familial history.