철도차량용 주름패널의 음투과특성에 관한 연구

김석현(Kim Seock Hyun),박정모(Park Jung Mo) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-

Sound transmission characteristics are investigated on the corrugated panels which used for railway vehicles. A special purpose program is developed to calculate the sound transmission loss of orthotropic multi-layered panels. Several kinds of corrugated panels are analysed to estimate the transmission performance and the results are compared with the measured data. Calculated transmission losses show good agreement with the measured values in corrugated panels and aluminum/foam multi-layered panels. The analysis results can be utilized to design the corrugated panels and multi-layered panels which are required to reduce the interior noise in railway vehicles.

철도차량용 주름판재의 차음성능

김석현(Kim Seock Hyun),박정모(Park Jung Mo) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1

Sound insulation performance is investigated on the corrugated panel used for a rail way vehicle. Random incidence sound transmission loss is calculated by using the equivalent orthotropic plate model. Analysis results on several kinds of corrugated panels are in good agreement with the measured data. The analysis method is applied to predict the sound transmission loss of the corrugated panel used for Korean high speed train.

직접구동형 가진기의 개발 및 성능평가

김오복(Kim O Bok),박정모(Park Jung Mo),김석현(Kim Seock Hyun) 강원대학교 산업기술연구소 1998 産業技術硏究 Vol.18 No.-

The purpose of this study is to design and manufacture a vibration exciter, which can be used in the education and research for the vibration engineering. For this purpose, a direct drive type vibration exciter is developed, which consists of a motor, an inverter, eccentric rotating sleeves and two excitation plates. Developed exciter is tested on some dynamic characteristics to evaluate its excitation performance. Test results show that the developed machine can excite bodies on the horisontal vibrating plates in x,y direction by the constant displacement amplitude in the frequency range below 50Hz, which confirm that the exciter can be used as a vibration testing machine in the low frequency range.

한국인에 있어서 상부식도의 이소성 위점막의 빈도 및 임상적 양상

이동욱(Dong Wook Lee),김은영(Eun Young Kim),박정모(Jung Mo Park),이원석(Won Suk Lee),곽동협(Dong Hyup Kwak),김정희(Jung Hee Kim) 대한내과학회 1998 대한내과학회지 Vol.54 No.1

N/A Objectives: This study was performed to investigate the incidence and the clinical significance of inlet patch of heterotopic gastric mucosa in Koreans. This lesion can be found by close observation around the upper esophageal sphincter during upper gastrointestinal endoscopy. Methods: From March 1, 1996 to July 8, 1996, at Kwak's hospital, randomly selected 271 patients undergoing routine diagnostic upper gastrointestinal endoscopy were included in this study. Patients with the inlet patch were confirmed by histology. Clinical symptoms observed through medical history were recorded. Results: Twenty-six cases(9.6%) of the 271 patients studied had heterotopic gastric mucosa which was found at or just below the upper esophageal sphincter, varing from 3 to 30mm in diameter. It was velvety red in color and distinct from the surrounding normal squamous esophageal mucosa, resembling the Z-line at the esophagogastric junction. Parietal cells were identified in all 18 cases in which biopsy specimen contained deep glands, and chief cells were found in 14 eases. Histologically, fundic gland type was most frequent. The symptoms were relatively mild, 5 out of 6 patients who complained of throat discomfort were relieved by H2 antagonists. Conclusion: In Koreans the incidence of heterotopic gastric mucosa in the upper esophagus was similar to the reports from western countries unlike Barrett's esophagus, The etiology of these patches appeared to be congenital rather than acquired from reflux of gastric acid. This was supported by its location in the proximal esophagus and lack of correlation with reflux esophagitis. It must be considered as one of the differential diagnosis of a patient who complains of throat discomfort during diagnostic upper gastrointestinal endoscopy. Attention needs to be paid to find possible development of complications such as stricture and adenocarcinoma in patients with the inlet patch of heterotopic gastric mucosa.

직접구동형 가진기의 개발 및 성능평가

박정모,김오복,김석현 江原大學校 産業技術硏究所 1998 産業技術硏究 Vol.18 No.-

The purpose of this study is to design and manufacture a vibration exciter, which can be used in the education and research for the vibration engineering. For this purpose, a direct drive type vibration exciter is developed, which consists of a motor, an inverter, eccentric rotating sleeves and two excitation plates. Developed exciter is tested on some dynamic characteristics to evaluate its excitation performance. Test results show that the developed machine can excite bodies on the horisontal vibrating plates in x, y direction by the constant displacement amplitude in the frequency range below 50Hz, which confirm that the exciter can be used as a vibration testing machine in the low frequency range.

철도차량용 주름판재의 차음성능

김석현,박정모 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.B

Sound insulation performance is investigated on the corrugated panel used for a rail way vehicle. Random incidence sound transmission loss is calculated by using the equivalent orthotropic plate model. Analysis results on several kinds of corrugated panels are in good agreement with the measured data. The analysis method is applied to predict the sound transmission loss of the corrugated panel used for Korean high speed train.

당뇨병환자에서 뇨증 Fibronectin농도의 증가에 관한 연구

한승범,조준승,손건영,서성문,박근용,조성래,박규영,박정모,이인규,여준기 啓明大學校 醫科大學 1994 계명의대학술지 Vol.13 No.4

Plasma fibronectin is an α₂-glyoprotein, which is produced by vascular endothelial cells. Raised level of plasma fibronectin has been observed in diabetic patients particularly in the presence of microvascular complications. However, no available data exist about urine level of this glycoprotein in diabetic patients. We measured urine fibronectin level by ELISA methods in 54 diabetic patients who have microvascular comlications or not. The following results were obtained. 1) Urine fibronectin level(㎍/g creatinine) in diabetic group(1740.0±678.0) is increased compaired with those in normal control group(471.0±59.0). but this results were not significantly different among two groups(P>0.05). 2) Urine fibronectin level(㎍/g creatinine) was significantly increased in patients with nephropathy (6188.0±3144.0) compared with those in normal control group(471.0±59.0) and patients without nephropathy(645.0±251.0)(P<0.001). 3) There were a significant correlation between BUN, creatinine, creatinine clearance, 24hr urine total protein and urine fibronectin level in diabetic patients. Our data suggest that urine fibronectin excretion level might be used as a sensitive guide for diabectic nephropathy.

대구, 경북지역에서 발생한 쭈쭈가무시병의 임상적 고찰

양창현,윤덕구,박정모,손수호,이준호,김윤년 啓明大學校 醫科大學 1992 계명의대학술지 Vol.11 No.3

Tsutsugamushi disease is acute febrile illness primarily affecting farmer and prevalent in Autumn. The disease is characterized by fever, rash and eschar and sometimes it caused atypical pneumonitis and it should be differentiated by Leptospirosis and Korean hemorrhagic fever. We experienced 38 cases of Tsutsugamushi disease diagnosed by clinical and detection of tsutsugamushi antibody by indirect immunofluorescent technique. Studied subjects were 15 cases of male and 23 cases of female and the victim were primarily farmer(89%). Most cases were occurred in October and September and in 1990. Fever and chills(94%)were the most complaint symptoms and other complaint symptoms were myalgia cough and dyspnea in the order of frequency. Leuhocytosis or leukopenia was detected in 14% and 11% respectively and 83% were detected to have thrombocytopenia. Transaminase was elevated in 57% and BUN and creatinine was elevated in 3%. Physical examination showed eschar(84%), rash(82%) hypatosplenomegaly(24%),conjunctival injection and hyperemia of pharynx. chest X-ray showed interstitial pneumonitis (11%) pulmonary edema(11%) and cardiomegaly(8%). 57% were revealed positive reaction to indirect fluorescent antibody technique. Clinical response was very good in the treatment of tetracycline vibramycin, or chloramphenicol.

식도 평활근종에 의한 이차성 식도이완불능증 1예

강영우,이준호,남복현,박정모,황재석,최경렬,허정욱,안성훈,박승국,박창권,유영선 대한내과학회 1993 대한내과학회지 Vol.44 No.4

이차성 식도이완불능증은 다른 질환에 동반되어 이차적으로 발생하며 위선암이 대부분인데 저자등은 최근 양성평활근종에 의한 이차성 식도이완불능증을 경험하였기에 문헌고찰과 함께 보고하는 바이다. The cause of achalasia is mostly idiopatic, bu secondary achalasia were occasionally found, of which gastric adenocarcinoma is by far the most common. We report a case of secondary achalasia associated with esophageal leiomyoma. The patient presented with clinical, radiologic and manometric featurese of achalasia with the the submucosal tumor on endoscopy, esophagogram, and CAT scanning of chest and abdomen. The excision of mass, segmental resection of lower esophagys and gastroesophgeal junction and esophagogastrostomy were perfomed. Histological examination demonstrated appearances consistent with leiomyoma.

단일 갑상선 결절에 대한 갑상선 호르몬 투여 효과에 대하여

한승범,우성구,이인규,박근용,박정모,여준기 대한내분비학회 1992 Endocrinology and metabolism Vol.7 No.1

To evaluate the efficacy of thyroid hormone suppressive therpy and the hormonal characteristics during suppressive therapy for solitary thyroid nodule, we measured plasma T3, T4, TSH concentration and thyroid volume by high-resolution ultrasonography in 42 patients with benign solitary nodule proved by fine-needle aspiration biopsy before and after treatment. After suppressive therapy, TSH stimulation testing was done. Forty-two patients were randomized to receive the comthyroid treatment (group A, n=24) or a placebo (group B, n=18). The duration of therapy was between 3 and 6 months. The results were as follows: 1) The clinical characteristics showed no significant differences between group A and group B. 2) Forty-two patients had 131I scintiscans. Two patients as functional nodule, 10 patients as hypofunctional nodule, 30 patients as nonfunctional nodule. 3) After thyroid hormone suppressive therapy, plasma TSH concentrations were lower in group A (1.7±0.8 uU/ml) than in those of group B (7.0±3.8 uU/ml) as own by the TRH stimulation test (p$lt;0.0001). 4) Before and after treatment, the maximal dimension and volume of the thyroid nodules showed no significant differences between group A and group B (p$gt;0.05). After treatment, there were significant decrement in those of group A (p$lt;0.05) and only the maximal dimension in group B (p$lt;0.05). Therefore we concluded that the efficacy of thyroid hormone suppressive therapy in reducing the size of solitary thyroid nodules is not apparent sithin 3 to 6 months, despite effective suppression of thyrotropin. (J Kor Soc Endocrinol 7:39~45, 1992)