용융침투법으로 제조한 알루미나-유리 복합체의 동적 피로 특성 평가

원대희,안승근,배태성,강동완,진영철 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.3

The fatigue characteristics of alumina-glass composites were evaluated by biaxial flexure test under the dynamic loading conditions. 88 specimens were tested by tested by testing 22 samples at each of four loading rates : 0.01, 0.1, 1, and mm/min. A Vickers-produced indentation crack was made at the center of the tensile surface with load of 49.0 N, and the microstructural aspects of crack propagation was investigated under statically loaded state in distilled water at 37℃. The results obtained were summarized as follows; 1. The fatigue parameter of alumina-glass composite containing 6 mol % yttria was n=22.2, σf0=319.6 MPa. 2. 10-year failure stress of alumina-glass composite containing 6 mol% yttria was 171.7 MPa. 3. Fracture surface of alumina-glass composite indicated the frictional interlocking of jogs having the tendency of toughening by crack deflection, rather than by crack bridging.

人體 胃癌 및 胃炎에서의 CEA의 表現에 對한 免疫酵素 組織學的 硏究

元南熙,李大一,白承龍 고려대학교 의과대학 1982 고려대 의대 잡지 Vol.19 No.3

Carcinoembryonic antigen (CEA) isolated from adenocarcinomata of human digestive system and fetal or embryonic gut tissue is one of tumor associated antigens. In recent years, extensive studies to detect CEA in the blood as well as in the tissue of various conditions have been reported. However, characterization of CEA in the tissue of stomach cancer, common malignant tumor in Korea, has rarely been investigated. The author performed peroxidase-antiperoxidase immunohistologic study with anti-CEA antibody to determine the presence of CEA in 51 cases of gastric adenocarcinoma and 18 cases of chronic gastritis. All tissues examined were obtained with endoscopic biopsy, fixed in 10% formalin and embedded in paraffin. The findings were analysed and results obtained are as following. 1. CEA positive reaction to anti-CEA antibody was noted in 45 of the 51 cases with gastric cancer (88.2%). 2. Patterns of positive reaction to anti-CEA antibody of 45 CEA positive adenocarcinomas were focal in 9 cases (20.0%), moderate in 10 cases (22.2%) and diffuse in 26 cases (57.8%). 3. Comparing the pattern of CEA positive reaction with histologic differentiation of cancer cell, the differentiated type showed diffuse linear pattern along membrane the surface and undifferentiated type revealed focal positive pattern in the cytoplasm. 4. Of 18 cases with chronic gastritis, 8 cases of non-specific gastritis and 10 cases of intestinal metaplasia, CEA poistive reaction to anti-CEA antibody was noted in 4 cases at the lesion of intestinal metaplasia. The results obtained above suggest that presence of CEA in gastric cancer is detected 88% of cases, variable in pattern, partly depending on morphologic differentiation, and even exhibit in goblet cells in some intestinal metaplasia which is believed to be a precancerous condition of stomach cancer.

3DFT-CISS를 이용한 감각신경성 난청 환자의 MBI

김성원,여상원,김상후,김종수,조재흥,이동희,이승균 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

그레이트 데인에서 발생한 위확장염전 증례

신희승,안지영,이영원,최호정 忠南大學校 獸醫科大學 附設 動物醫科學硏究所 2009 動物醫科學硏究誌 Vol.16 No.1

A 4-month-old female Great Dane dog with abdominal distention and non-productive retching after gulping of food and water yesterday was referred to the Veterinary Medical Teaching Hospital of Chungnam National University. Depression and abdominal distention with tympany were observed on physical examination. Decreased RBC and PCV were observed on CBC. And ALKP, BUN, Glu and P were increased on a serum chemistry. Severe gas filled distention of the stomach and intestines were shown on the abdominal radiographs. Pylorus was displaced craniodorsally toward the left side and gastric body was deviated to the right side on the abdominal radiographs. Deviating cranially of the diaphragm and decreased size of the heart were observed on thoracic radiographs. Therefore this case was diagnosed as gastric dilatation-volvulus.

Combining Timber Production and Wood Processing for Increasing Forestry Income: A Case Study of 6th Industrialization in Korean Forestry

Won, Hyun Kyu,Jeon, Hyon Sun,Han, Hee,Lee, Seung Jung,Jung, Byung Heon Institute of Forest Science 2017 Journal of Forest Science Vol.33 No.4

This study was aimed to analyze the increased forestry incomes by combining timber production and wood processing, which is one of 6th industrialization types in Korean forestry. The selected household has been engaged in forestry for two generations and they produce timber and associated wood products in their own facility. The wood products include dimension lumber, interior wood material, cutting board, and cube chips, the household also utilize logging and sawmill residues as well as seed and seedlings as by-products. Incomes and expenses that have been incurred on individual processes of the sequential timber production and wood processing were surveyed, and we analyzed the economic outcomes of entire business. The results of this study indicate that the gross income of the household is 122.3 million Korean won and the net income is 93.6 million Korean won. The net income of the household is approximately 2.8 times higher than the average net income of whole households in the forestry of Korea in 2016, which is approximately 4.3 times higher than that of households that have been particularly engaged in timber production over the country. We found that the 6th industrialization by combining the two sequential processes creates approximately 3.2 times as much added value compared to the case relying on timber production only.

정신분열병 환자에서 골밀도 변화와 관련 위험요인

원승희 대한생물치료정신의학회 2004 생물치료정신의학 Vol.10 No.1

Osteoporosis is dearly a serious public health problem in the general population, resulting in considerable morbidity and mortality. Lifestyles of individuals with schizophrenia are at increased risk for osteoporosis and fractures for several reasons, including lack of exercise, poor nutritional status, cigarette smoking, and alcohol drinking. Some antipsychotic medications may further increase the risk of fractures by causing dizziness, orthostatic hypotension, polydipsia, and falls. But obesity could play a protective role. Of particular concern is the impact of prolactin-elevating antipsychotic medications since the elevated prolactm may have direct and indirect inhibitory effects on osteoblastic function. Preliminary surveys have indicated that schizophrenic patients also may have elevated rates of osteoporosis and pathological fractures, Dossibly resulting in part from the long-term administration of antrpsy-chotic agents-that produce hyDerprolactrnernia and secondarily lower estrogen and testosterone levels. Although the effects of antipsychotics on prolactin have been well studied, effects upon borne mineral density have received little attention despite of the important implications. Clinicians should address with their schizophrenic patients general health issues such as cigarette smoking, diet. daily activity and medication, which may contribute to osteoporosis. The magnitude of decreased bone mineral density and the ensuring increased susceptibility to osteoporosis and fractures is higher in women with schrzophrenia than in men with schizophrenia Therefore, the loss of menses in a woman treated with prolactin-elevating medications should raise the concern of hypoestrogenism and should be given a test for bone mineral density. The author reviewed osteoporosis and relative risk factors in schizophrenic patients for preyention and early treatment for osteoporosis.

소규모 도시의 생활폐기물 발생특성 : 동해시를 중심으로 For Donghae City

김승호,원철희,김병욱,임재명 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.B

This research was performed to investigate the generation and physico-chemical characteristics of municipal solid wastes. The results were as follows: i) The generation rate and bulk density were 0.157 kg/cap/d and 147.8 g/L in residential zone, respectively. In non-residential zone, the generation and bulk density were 1.71 kg/cap/d and 85.6 g/L, respectively. Consequently, bulk density of non-residential zone was lower than that of residential zone. ii) The wastes consisted of 90% of combustibles and 10% of incombustibles in residential zone. And the wastes from non-residential zone was composed 85% of combustibles and 15% of incombustibles. iii) Water content was estimated at 47∼50% in residential zone and restaurants. In non-residential zone, except restaurants, water content was in the range of 10∼30%. Ash content was nearly 10% in overall zone.

Autophagy 매개체인 LC3로 인한 Aβ 신경 독성의 증가

이승아;이현정;김도희;김옥현 박지애;김대진;정윤희;김경용;김성수;이원복 중앙대학교 의과대학 의과학연구소 2012 中央醫大誌 Vol.37 No.1/2

Autophagy is a highly regulated cellular mechanism that results in the bulk degradation process and which seems to be implicated in a variety of physiological and pathological conditions relevant to Alzheimer's disease (AD). Also, it has been suggested that the large part of autophagy is mediated by Light Chains 3 (LC3). Despite research suggesting an association between AD and autophagy, many issues remain to be addressed. To determine the relevance between autophagy and AD, we evaluated amyloid beta (Aβ) toxicity either in SH-SY5Y cells transfected with only EGFP or the cells exogeneously transfected with EGFP-LC3, mediating autophagy easily by overexpressed LC3. Without treatment of Aβ, the cell viabilities were quietly similar in both kinds of cells. The cell viability was decreased significantly in LC3 overexpressed cells. Consistently, more increased oxidative stress was detected in LC3 overexpressed cells. These results suggest that autophagy enhanced Aβ toxicity by way of increasing oxidative stress at least in part. This study will be of help to understand the role of autophagy in neurodegenerative diseases.

여가스포츠 참여와 서비스마케팅 특성과의 관계

유승원,정희석 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.4

Based on the characteristics of the service marketing and those of the leisure sport population and society, a survey on leisure sport service marketing was carded out regarding the satisfaction of leisure sport participants and workers in the leisure sport industry, The survey aimed to promote the leisure sport industry through understanding the relationship between the leisure sport participation and the characteristics of the service marketing. The subjects of the survey were 574 in total, For the statistical analyses Duncan test and co-variation analysis were done for the verification and to examine the variance differences, The founding of the research was as follows; First, in the relationship of the service marketing characteristics and the kind of leisure sports, there were statistically meaningful differences in basic-service(BS), program-management-service(PMS), effect-service(FS) and general service(GS) regarding sex; in facility-service(FS) and effect-service(FS) regarding the marital status; in basic-service(BS), program-management-service(PMS), facility-service(FS) and general service(GS) regarding the kind of leisure sports, The satisfaction of squash was the highest and that or golf the lowest. Second, in the relationship of the service marketing characteristics and the frequency of leisure sport participation, there were statistically meaningful differences in basic-service(BS) and program-management-service(PMS) regarding sex; in facility-service(FS) and effect-service(FS) arid general service(GS) regarding sex arid the marital status. There were statistically meaningful differences in BS, PMS, FS and GS regarding the independent variable of participation frequencies, The satisfaction of the 'once a month' group was the highest and that of 'almost everyday' group was the lowest.

새로운 유사 원자층 증착 방법에 의한 산화막의 형성 및 터널링 자기 접합에의 응용

한신희,정원철,이장식,김병동,주승기 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.1

The tunneling barrier is crucial to the overall performance in magnetic tunnel junction. We have suggested a new formation method for the tunnel barrier, which has utilized pseudo atomic layer deposition with sputtering (PALDS). As is well known, all metallic thin films oxidize more or less under atmospheric conditions. With using this property of metallic thin films, we have prepared tunnel barrier by sputtering metallic thin film and exposing it to the oxygen ambience. From transmission electron microscopy (TEM) observation, the formed tunnel barrier has been confirmed to have clear and good interface between magnetic layers and tunnel barrier. From atomic force microscopy (AFM) observation, it has been also confirmed to have low surface roughness. The TMR MRAM cell manufactured using PALDS method has been shown to exhibit typical tunnel resistance of 86 KΩ·μm^2 and TMR ratio of about 40%. The 40% of MR is quite large. It is considered that this value is geometrically enhanced magnetoresistance due to the low junction resistance of MTJ.