지지대에 인접한 전열관 결함으로 인해 발생되는 보빈 와전류 신호의 예측 및 분석

신영길,이윤태 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-

In this study, eddy current signals from various anomalous defects in the heat exchanger tube are predicted and their signal slope characteristics are analyzed. The signal changes due to frequency increase are also observed. Based on the accumulated knowledge, the analysis of superimposed signal is attempted which includes the effects of support plate. Both differential and absolute bobbin probe signals are analyzed. For the prediction of signals, axisymmetric finite element modeling is used and this leads us to the utilization of slope angle analysis of the signal. Results show that differential signals are useful to locate the position of defect under the support plate and absolute signals are easy to predict and analyze even though they are superimposed signals. Combined use of these two types of signal will help us accomplish a reliable inspection.

消石灰處理가 볏짚의 粗成分 및 消化率에 미치는 影響에 관한 硏究

辛炯泰,魏筍英,金永玉 成均館大學校 1981 論文集 Vol.29 No.-

Nylon bag dry matter digestibility (NBDMD, %), nylon bag organic matter digestibility (NBDMD, %) and chemical compositions were analysed to evaluate the nutritive values of 5 varieties of Ca(OH)_2-treated rice straws (Akibare, Tongil, Milyang 23, Yooshin and Suwon 264) by using Korean native male goats. Three grams of dried samples by grinding with 2.45㎜ Wiley mill screen were put into a bag 9×14 ㎠ made of 100 mesh nylon. These bags were put into the ventral sac of the rumen and taken out at the end of 72 hours. They were washed, dried in an oven at 105℃ for 24 hours and weighed "NBDMD" (%) and ashed in an muffle furnace at 600℃ for 2 hours and weighed "NBOMD" (%). The results which were obtained with this experiment were as follows : 1. Nylon bag dry matter digestibility (NBDMD, %) and nylon bag organic matter digestibility (NBOMD, %) of Ca(OH)_2-treated rice straws were highly significant different (p<0.01) in different levels of Ca(OH)_2 treatment and of different varieties of rice straws. 2. The relationship between total mean NBDMD (%, Y_1) of 5 varieties of rice straws and Ca (OH)_2 concentration (%, X) at 72 hours rumen incubation was : Y_1=1.51X+41.36 (r=0.97^**) 3. The relationship between total mean NBOMD (%, Y_2) of 5 varieties of rice straws and Ca(OH)_2 concentration (%, X) at 72 hours rumen incubation was : Y_2=1.36X+41.02 (r=0.95^**) 4. The orders of NBDMD (%) and NBOMD (%) for 5 varieties of rice straws were Yooshin, Suwon 264, Milyang 23, Tongil and Akibare, and Yooshin showed the highest values and Akibare showed the lowest values. Crude fiber, cell-wall constituents and lignin percent in the five varieties of rice straws were shown the negative relation to the NBDMD (%) and NBOMD (%).

신증후군의 혈청 면역글로부린 농도에 관한 연구

辛榮泰 충남대학교 의과대학 지역사회의학연구소 1987 충남의대잡지 Vol.14 No.2

To evaluate the alterations of serum immunoglobulin concentrations in various pathologic types of idiopathic nephrotic sgndrome, serum concentrations of IgG, IgA, IgM and IgE were measured in 47 adult nephrotic syndrome who were admitted to Department of Internal Medicine, Chungnam National University Hospital from April 1982 to October 1987. The results were as follows 1. Serum IgG conceptions were depressed in most patients with nephrotic syndrome and correlated well with various parameters of nephrotic syndrome; with serum protein concentrations in MC(r=0.61, p<0.05); with serum cholesterol concentrations in MG(r=-0.54, p<0.05) ; with serum protein and cholesterol concentrations in MPGN(r=0.88, p<0.05 and r= -0. 89, p<0.05, respectively) 2. Serum IgA concentrations were within normal limit in most patients. 3. Serum IgM concentrations were elevated in 8 patients out of 20 patients with MC, 3 patient out of 15 patients with MG and 2 patients out of 4 patients with FGS. Those of the remaining patients revealed within normal limit or slightly decreased level. 4. Serum IgE concentrations were elevated in 6 patients out of 12 patients with MC and 3 patients out of 4 patients with MG.

成人 腎症候群의 臨床的 硏究

辛榮泰 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.2

A clinical study was performed on 66 patients with idiopathic nephrotic syndrome who were admitted to Department of Internal Medicine, Chungnam National University Hospital from May 1981 to Oct. 1986. The results were as follows. 1. The ratio of male to female was 2.1:1. In young age group, minor change was the most predorminant type. In old age group, membranous glomerulopathy was predorminant type. 2. By histologic classification, minor change was 37.9%, membranous glomerulopathy 27.3%, focal glomerulosclerosis 11.7%, membranoproliferative glomerulonphritis 9.1%,m mesangial proliferative glomerulonephritis 4.5% and chronic sclerosing glomerulopathy 4.5% respectively. 3. The serum creatinine concentration of membranoprliferative glomerulonephritis was significantly elevated. 4. The serum C_3 and C_4 concentration of membranoproliferative glomerulonephritis was significantly depressed. 5. Serum IgG concentrations were depressed in 87.2%, serum IgA concentraions were within normal limit in 84.6% and serum IgM concentrations were elevated in 59% of the patients. Serum IgE concentrations were elevated in 8 patients out of 13 patients. 6. HBsAg were positive in 10 patients (15.2%) out of 66 patients.

전신성 홍반성 낭창의 임상적 고찰

신영태,이정호,신승훈,이강욱 충남대학교 의과대학 지역사회의학연구소 1989 충남의대잡지 Vol.16 No.2

To elucidate the clinical feature and clinicopathologic correlation of systemic lupus erythematosus(SLE), the authors analized symptoms and signs, laboratory findings and kidney pathology in 25 patients with SLE who were admitted to the Department of Internal Medicine, Chungnam National University Hospital from My 1985 to October 1989. Kidny biopsy was performed in 15 patients out of 19 patients who showed lupus nephritis. The results were as follows: 1. The ratio of male of females was 1:11.5. They were 14 to 53 years old and mean age was 30.2 years old. The peak age incidence was 3rd and 4th decades. 2. The most frequent chief complaint on admission was fever and chills. Most patients had two or more symptoms such as arthralgia, malar rash, generalized edema or weakness. 3. In 84% of the patients, duration from onset of the disease to diagnosis of SLE was longer than 1 month, which suggested that diagnosis of SLE is not easy in early stage of SLE. 4. The positive anti -DNA was the most frequently observed ARA criteria of SLE. And positive ANA, malar rash, persistent proteinuria, leukopenia, positive LE cell preparation, arthritis and oral ulcer were observed in order of frequency. 5. The frequent and pertinent general symptoms, not included in ARA criteria were fever and chills, arthralgia and abdominal pain which were observed in more than half of the patients. 6. On immunologic test, serum concentrations of C3 and C4 were decreased in 96% of the patients, serum concentration of Ig G, Ig A were increased in 65%, 36.8% and 26.3% of the patients respectively. The RA test was positive in 25% of the patients. 7. Lupus nephritis represented 76% of all SLE patients and pathological classification on 15 patients with lupus nephritis revealed class IV lupus nephritis in 9 patients(60%), class II n 3 patients (21%), class V in 2 patients(13.3%) and class III in 1 patient. 8. 7 out of 9 patients with class IV lupus nephritis and 1 out of 2 patients with class V lupus nephritis showed nephrotic syndrome. Progressive azotemia were observed in 3 out of 9 patient with class IV lupus nephritis and in 1 out of 2 patients with class V lupus nephritis. There were no nephrotic syndroms or azotemia in class II and class III lupus nephritis. 9. Of 17 patients who can be followed up, 9 patients were improved, 5 patients became progressive azotemia and 3 patients resulted in death. The causes of death were myocarditis with pericarditis in 1 patients, pneumonia with acute respiratory failure in 1 patient and CNS involvement of SLE in 1 patient.

혈청 HBsAg 양성인 사구체신염의 임상상 및 신조직 소견

신영태,구영선,강민규,황평주,김종학,이강욱,서광선 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.1

Hepatitis-B-associated glomerulonephritis is one of the immunologically mediated disorders associated with chronic Hepatitis B virus(HBV) infection. The frequency of HBsAg infection has been high in East Asia and it is one of the most important etiologic factors of the secondary glomerulonephritis. We reviewed the clinical and pathologic features of 29 patients with glomerulonephritis and HBs antigenemia, who were admitted to Chungnam National University Hospital from January 1988 to Febuary 1999. The results were as follows : 1) The average age of the patients was 33.8±10.4(mean±SD) and male to female ratio was 3.8. Proteinuria was present in 27 patients(93%), hematuria in 20 patients(69%) and hypertension in 17 patients(59%). Two patients(7%) manifested with renal insufficiency and 8 patients(28%) with nephrotic syndrome. 2) Renal pathology revealed membranous nephropathy(41%), membranoproliferative glomerulonephritis(21%), mesangial proliferative glomeulonephritis(21%), minimal change nephritis (14%) and focal segmental glomerulonephritis(3%). 3) The pathologic findings of liver were chronic active hepatitis(68%), chronic persistent hepatitis(38%) and liver cirrhosis(8%). 4) During the follow-up period(average:49.4 months), 7 patients(68%) presented persistent proteinuria, 5 patients(21%) progressed to renal failure and 2 patients(8%) resolved clinically. 5) The treatment was done with prednisolone to 3 patients, and with alpha-interferon to 3 patients. One patient treated with prednisolone resolved clinically, but this resolution did not coincide with disappearance of the hepatitis B antigens.

蛋白質 供給源이 흰쥐의 成長 및 窒素均衡에 미치는 影響

辛炯泰,金永玉 成均館大學校 科學技術硏究所 1985 論文集 Vol.36 No.1

This experiment was conducted to study the effect of protein supplementation to rice diet on growth, digestibility, nitrogen balance and nitrogen retention by growing rats. The experimental diets were consisted of rice diet (no supplementation of protein, I), soybean meal diet (II ), casein diet (III), fish meal diet (Ⅳ), lysine+threonine diet (V), 1/2 soybean meal+1/2casein diet (Ⅵ), 1/2 soybean meal+1/2fish meal diet (VII). Experiment was undertaken with 42 weanling male rats of Sprague-Dawley strain for 3 weeks and they were evenly divided by 7 treatments, respectively and feeds and clean water were available ad libitum. For the experimental period, body weight gain, feed intake, feed efficiency ratio, protein efficiency ratio, digestibility (dry matter, organic matter, crude protein), nitrogen balance and nitrogen retention were measured to evaluate the nutritional effects of protein sources. Some results which were obtained with this experiment as follows: 1. The average daily body weight gain for growing rats fed experimental diets(I-VII) were 0.95g, 2.03g, 2.97g, 3.27g, 2.48g, 2.71g, 2.77g, respectively. The highest body weight gain was fish meal diet (IV) and the lowest was sodbean meal diet (II). And the other diets ( III , V,Ⅵ,VII) showed similar weight gains. 2. Feed efficiency ratio (FER) was higher for fish meal diet (IV) and casein diet (III) than the other diets. And feed efficiency ratio of the other diets were similar. 3. Protien efficiency ratio (PER) followed the same pattern as the feed efficiency ratio. 4. Digestibilities of dry matter and organic matter were for casein diet (III) of 94.07%, 96.01%, respectively and soybean meal diet (II) of digestibilities of dry matter and organic matter 91.59%, 93.98% respectively. Protein digestibility showed the same pattern as the protein efficiency ratio. 5. The nitrogen balance and nitrogen retention of fish meal diet (Ⅳ) were higher than those of the rest of diets and soybean meal diet (II) was shown the lowest values. 6. As studies with rice diets by growing rats, protein supplementation to rice was superior to unsup plemented diet in performance, nitrogen balance and nitrogen retention. To compare the nutritional values of protein sources in this experiment, fish meal and casein as animal protein sources showed the highest performance, nitrogen balance and nitrogen retention. Combined animal protein and plant protein and lysine+threonine supplementation were the middle (performance, nitrogen balance and nitrogen retention) and soybean meal as plant protein showed the least (performance, nitrogen balance and nitrogen retention).

자성체 가스관에서 복수의 결함에 의한 원격장와전류 신호특성 조사

신영길,이윤태,송성철,정희성 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

Remote field eddy current testing signals have unique signal characteristics such as the equal sensitivity to ID and OD defects and the linear relationship between defect depth and phase signal strength. In this paper, those and new signal characteristics are studied by carefully prepared experiments with gas pipes. Many kinds of defects are designed and fabricated, such as ID and OD defects, axial and circumferential defects, and multiple defects on the same circumference. Multiple defects on the indirect paths and very long defects reveal the linear relationship between defect depth and phase signal strength. Equal sensitivity to ID and OD defects is also demonstrated. It is found that the phase signal is more sensitive to axial defects and the phase signals from circumferential defects tend to underestimate the total defect length.

가스관의 원격장와전류 탐상실험에서 관찰된 결함신호의 특성

신영길,이정호,이윤태,송성진,정태언 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

When the identical coils are used for the exciter and sensor in the remote field eddy current (RFEC) probe, two defect indications appear in a single defect signal. The two indications are expected to be the same according to numerical simulation study. However, in our previous experimental work on 1" diameter ferromagnetic tube, we had found that the two indications in a phase signal are not identical and it may be possible to estimate the defect depth by comparing the two indications in a single phase signal. In this paper, those findings are re-examined with gas pipes whose diameter is 48.8 mm. At first, the operating frequency and the coil spacing in a probe are decided. Secondly, defect specimens are designed and built after examining edge effects and the signal sensitivity to the distance between sensor and defect. The RFEC testing experiments using these specimens show the same tendency as appeared in 1" diameter tube, i.e., the defect indication that appears in a phase signal as the exciter coil passes a defect is smaller for shallow defects, but it becomes bigger than the other for deep defects. This finding seems to be very important since it enables us to estimate the defect depth without preparing calibration curves for various depths of defects.

成人 Henoch-Schoenlein 자반증의 임상적 고찰

신영태,이강욱 충남대학교 의과대학 지역사회의학연구소 1992 충남의대잡지 Vol.19 No.2

Twenty cases of Henoch-Schoenlein purpura were studied in the Department of Internal Medicine, Chungnam National University Hospital from November 1986 to September 1992. The results were summerized as follows 1. There were 11 males and 9 females. They were 14 to 59 years old and the median value of the age was 19 years old. 2. The chief complaints on admission were purpura in 12 cases, hematuria in 4 cases and abdominal pain in 4 cases. Seven out of 20 cases had antecedent infection history; 5 cases with URI, 1 case with pneumonia and 1 case with meningitis. 3. The organ involvement were skin in all cases, kidney in 80%. gastrointestinal tract in 65% and joint in 45% of the patients. 4. Other main symptoms or signs were fever of chills, gross hematuria, melena, flank pain and nausea and vomiting in 9, 7, 6, 6 and 5 cases, respectively. 5. Abnormal hematologic or coagulation findings were leukocytosis in 45%, thrombocytosis in 15% and prolonged aPTT in 16.7% of the patients. 6. Serum C_3 were decreased in 2 out of 18 cases and C_4 were normal in all cases. Serum IgG and IgA were elevated in 27.8% and 61.6% of the cases, respectively. 7. The ASO titers were increased in 2 out of 18 casese and CRP were positive in 40% of the patients. 8. The histopathologic finding of the skin biopsies were leukocytoclastic vasculitis in all cases. 9. Nephritis were observed in 16 cases(80%). Seven out of 16 cases had history of gross hematuria. Severe proteinuria over 3.5gm/day were observed in 3 out of 16 cases. Among them, only one case showed decreased renal function. 10. Light microscopic finding of the 13 kidney biopsies showed grade Ⅰ in 1 case, grade Ⅱ in 4 cases, grade Ⅲa in 4 cases, grade Ⅲb in 3 cases and grade Ⅳ in 1 case. Immunofluorescent microscopic findings of the 12 kidney biopsies showe IgA, fibrinogen, C_3 , IgM and IgG deposits in 83.3%, 75%, 41.7%, 8.3% and 0%, respectively. 11. The outcome of the 4 cases without nephritis was symptom free status after short-term corticosteroid therapy. The outcome of he 15 cases with nephritis were disease free in 4 cases, improved in 3 cases, no changes in 6 cases and aggravated in 2 cases(13.3%) during the follow up period. The renal pathology of the two aggravated cases were grade Ⅲb. One case of them had severe proteinuria and gross hematuria and another case was older age(48 years old) compared with other patients.