CoNbZr/Cu/CoNbZr 다층박막의 습식 식각 거동에 관한 연구

윤재홍,김현식,송재성,이영생,민복기 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

We manufactured CNZ/Cu/CNZ multi-layers by sputtering methode and formed pattern on the deposited multi-layers. In this study, we fabricated new etchant for the etching to formed pattern by the wet chemical etchant. it was searching for the best condition of etchant. Cu was etched selectively independence in the concentration of basic solution but amorphous CNZ thin film did not. The etchant was achieved by basic solution(17.5 mol%) and HF(20mol%) mixing, which etched CNZ/Cu/CNZ multi-layers in the same. Also, the etchant etched CNZ/Cu/CNZ multi-layers by the three-step. It was shown that the etched cross-section have isotropic structure and excellent etching characteristics.

임신과 갑상선 기능장애

張然復 대한의학협회 1993 대한의학협회지 Vol.36 No.1

만성적 소음폭로가 근로자의 혈압에 미치는 영향

김복연,김천태,이중정,박홍진,김창윤,강복수 大韓産業醫學會 1996 대한직업환경의학회지 Vol.8 No.1

The question of an association between occupational noise exposure and blood pressure has important public health implications. The harmful effects of hypertension are well known and noise is considered the most pervasive problem of all occupational exposures in Taegu City, Korea. A cross-sectional study on the effect of long-term noise exposure on blood pressure was done for 276 noise exposed workers(203 male workers, 73 female workers). Long-term noise exposure was measured by cumulative noise exposure level and noise-induced hearing loss. Hearing loss = 500Hz+2×1,000Hz+2×2,000Hz+4,000Hz -------------------------------------- 6 Questionnaire was administered to the workers, which includes age, sex, occupational history on the noise exposure, habits on alcohol drinking and smoking, practice of regular exercises, family history of hypertension. Type A behavior, question on stress, height, weight and blood pressure were measured. Serum triglyceride and low density lipoprotein(LDL) were also measured. Audiometry was done in the closed booth at 1,000, 2,000, 3,000, 4,000, 6,000, 8,000, 1,000 and 500Hz in order. Multiple logistic regression analysis revealed that cumulative noise exposure level(p〈0.05), serum triglyceride(p〈0.01), age(p〈0.01) and family history of hypertension(p〈0.05) predict hypertension (systolic blood pressure : 160㎜Hg or above, or diastolic blood pressure : 95㎜Hg or above) in male workers. In female workers, serum triglyceride(p〈0.01), LDL(p〈0.01) and family history of hypertension(p〈0.05) were predictors of hypertension (systolic blood pressure : 160㎜Hg or above, or diastolic blood pressure : 95㎜Hg or above). As the number of female workers with hypertension was too small, the multiple logistic regression was done according to hypertension criteria of systolic blood pressure greater than or equal to 140㎜Hg, or diastolic blood pressure greater than or equal to 90㎜Hg. Based on this criteria, cumulative noise exposure level(p=0.055) and age(p=0.057) predict hypertension. It is suggested that long-term noise exposure which was calculated by cumulative noise exposure level was a significant predictor of hypertension in noise exposed workers.

장상피화생과 Helicobactor pylori와의 상관 관계에 관한 연구

이복희,김대수,이현숙,진영주,윤세진,송형근,성노현,정현용,이동호 충남대학교 의과대학 지역사회의학연구소 1994 충남의대잡지 Vol.21 No.2

In 1965 Lauren divided advanced gastric carcinoma into two main types-namely, "intestinal" and "diffuse" type carcinoma, which differ not only morphologically but also in their clinical and epidemiological characteristics. Moreover, a different histogenetic process has been postulated by many authors that intestinal type gastric carcinoma might arise from areas with intestinal metaplasia. Since Warren and Marshall reported the presence of Helicobacter pylori in the stomach in 1983, strong evidence has been obtained that there is a close relationship between Helicobacter pylori and chronic gastritis, atrophic gastritis, intestinal metaplasia, and intestinal type gastric carcinoma. To study the relationship between intestinal metaplasia and Helicobacter pylori infection, we performed gastroscopic biopsies and CLO tests taken from patients with epigastric pain. Only 87 patients with macroscopically suspected antral gastritis were included. The prevalence of intestinal metaplasia in gastric antral biopsies increased from 33.3% in the age group<30 years to 63.6% in the age group 60 years. When all patients were divided into two age groups-namely, (i)<50 years(n=41) and (ii)≥ 50 years(n-=46), intestinal metaplasia was found significantly more often in patients ≥ 50 years. ((i) 39.2%, (ii) 54.3%, p<0.0001). The prevalence of Helicobacter pylori in gastric antral biopsies decreased from 66.7% in the age group<30 years to 62.5%, in the age group in the age group 50 to 59 years. When all patients were divided into the same two age groups-namely(i)<50 years and (ii)≥50 years, the prevalence of Helicobacter pylori did not differ between two groups in a statistically significant way. The mean age of intestinal metaplasia positive patients who were also Helicobacter pylori positive was 48±11.0(mean±S.D.)years, whereas the mean age of intestinal metaplasia positive patients who were Helicobacter pylori negative was 52±9.7(mean±S.D.)years. In conclusion. although our data do not prove a causal relationship between Helicobacter pylori infection and the histogenesis of intestinal metaplasia, we suggest that Helicobacter pylori plays an important role in the development of intestinal metaplasia in the gastric mucosa. Whether Helicobacter pylori has to be present at all times during this process or is only necessary as a 'trigger', needs further research.

진공청소기용 유니버셜 모터의 소음특성에 관한 연구

최연옥,현성복,조금배 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.1

The noise of the most industrial universal motor are mainly caused by the electromagnetic effect. This kind of noise can be amplified by the structure itself, if the frequency components of the magnetomotive force are close to the resonance frequencies of the structure. Therefore, there must be an intermediate process which usually called structure dynamic modification to avoid this phenomenon. In order to yield the input forces for the motor, analytical forms of magnetomotive force were obtained and those were feed to do response analysis. Through these analysis, some design guide were suggested to reduce the vibration of the universal motor.

Ca^(2+)-감수성 증가기전과 평활근 수축

이연리,김보경,최원호,김태경,이창권,배영민,조성일 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

Smooth muscle contraction is regulated by intracellular Ca^(2+) ([Ca^(2+)]_(i)) and the phosphorylation of myosin light chain (MLC). However, various kinds of vasoconstrictors induce a further contraction at a given [Ca^(2+)]_(i), and elicit a sustained contraction under Ca^(2+) -depleted conditions, referred to as "Ca^(2+) -sensitization", in intact and membrane-pen-neabilized smooth muscle. Previously, several molecules, including protein kinase C (PKC), RhoA, and mitogen-activated protein kinases (MAPK), have been suggested as candidate regulators of Ca^(2+) -sensitization. In the present review, we describe the role of PKC, RhoA, and MAPK in the regulation of Ca^(2+) -sensitization, and suggest a new model in research for the regulation of smooth muscle contraction.

전자식 ballast의 시험용 의사부하에 관한 연구

이규대,이윤섭,최복길 公州大學校工科大學生産技術硏究所 1994 論文集 Vol.2 No.-

형광들을 점등시키는 안정기의 역할은 형광등과 같이 부저항특성을 갖는 방전등에 과전류가 유입되어, 파괴되지 않도록 일정전압 및 전류를 유지시켜주는 것이다. 최근 사용되고 있는 전자식안정기는 25-30KHz의 주파수를 사용, 캐패시터에 의한 안정화전류를 유도하고 있다. 그러나 전자식안정기는 고주파를 사용하는 관계로 제품의 품질보증을 위한 제반 규정이 까다로워 생산자는 개개의 안정기를 실제 형광등을 사용하여 특성검사를 하고 있다. 본 논문에서는 전자식안정기 특성검사의 효율성을 제고하기 위해 실제 형광등과 동일한 특성을 갖는 의사부하의 설계에 관하여 연구하였다. 초기의 과도 조건을 고려하지 않는 정전압 특성을 갖는 의사부하를 설계하여 실험한 결과 제한된 조건하에서 사용될 수 있음을 확인하였다. The electronic ballast has a role of taking a stable current of fluorescent lamp, which has a characteristics of negative resistance. Recently, it has been designed and operated on using the regulated constant current with capacitor and high frequency of 25 to 30KHz. But a fabricated electronic ballast in an assembly line was difficult to test, because it used a high frequency and needed strict provisions. And then manufacturer is now testing each ballast with a real fluorescent lamp. In this paper, we studied that real lamp can be replaced by a dummy load with the same characteristics.

CR 영상판의 선식별능 측정에 관한 연구

김영근,지연상,김창복 광주보건대학 2003 論文集 Vol.28 No.-

Line spread function(LSF) in computed radiography was measured by an program, testing for measurement digital radiograph, to measure density automatically. The results were as follows : the width between two lines in slit assembly have to be reappeared black lines with 10㎛ on IP image, but that was measured hundreds of microns because of diffusion of light in phosphor. LSF on digital image could be measured by new computerized profile, therefore, capability of digital measurement is also expected on modulation transfer function(MTF) for measuring analog signal.

운동이 일부 남녀 대학생들의 혈청과 뇨중 칼슘, 마그네슘 및 아연함량에 미치는 영향

임상선,김형락,차연수,안창범,정복미 여수대학교 1997 論文集 Vol.11 No.2

This study investigated the effect of regular exercise on mineral status in college students. Mineral status for calcium, magnesium, and zinc was evaluated prior to beginning the study and again after 35 days of exercise training for 30 minutes per day. The results obtained were summarized as follows: 1) Serum concentrations of calcium and magnesium were decreased in female subjects but were not affected in males. 2) Urinary excretion of calcium and magnesium was significantly increased in male subjects but unchanged in females. 3) Serum and urinary zinc concentrations were not affected in either male or female subjects. These results suggest that regular exercise may have different effect on calcium and magnesium in humans, depending on gender.

서방성 Cephalexin-Eudragit^� 마이크로캅셀의 생물약제학적 평가

한건,김광덕,정연복,지웅길,김신근 충남대학교 약학대학 의약품개발연구소 1993 藥學論文集 Vol.9 No.-

Microcapsules(Mc) of cephalexin (CEPH), using Eudragit RS, RL, L, S and polyethylene glycol 1540, were evaluated biopharmaceutically. The area under the curve of CEPH-Eudragit RS/RL Mc administered orally once was larger than that of cephalexin powder twice every 6 hrs. Controlled-release effectiveness and the absorption rate effectiveness, two important parameters of Vallner's method, of CEPH-Eudragit RS/RL Mc indicate that these Mc can be good sustained-release preparations. And a simple pharmacokinetic model is introduced which allows the gastric emptying and intestinal-transit rates of a drug itself and a solid-state drug contained in Mc. Decreasing k, without change in k_α showed that the rate-limiting step of absorption moved from absorption step to release-step.