소양호의 DOC와 POC의 분포

김범철,최광순,김철구,이유희,김동섭,박제철 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-

Seasonal and vertical distributions of dissolved and particulate organic carbon were investigated from May 1995 to March 1997 in n deep mesotrophic reservoir, Lake Soyang, POC contentrations at the dam site ranged from 0.1 to 1.8 mgC/L and DOC concentrations ranged from 1.4 to 4.9 mgC/L. POC concentrations in the surface layer were higher in the season of cyanobacterial bloom, July to September. High POC was observed at the depth of 30 to 60m after storm runoff in summer monsoon season. Turbid storm runoff formed intermediate current laden with much particulate materials from terrestrial sources. The vertical and seasonal variation of DOC was smaller than POC. Higher DOC was observed near the lake bottom which implies sedimentation and degradation of much organic detritus at the bottom. The ratio of DOC : POC varied from 2 to 60, and the ratio was lowest in September 1995 when algal density was highest. DOC : POC ratio of the main inflowing river, the Soyang River, varied from 1 to 10, and the ratio was low in storm runoff when the POC concentration was high.

위절제술 환자의 표준진료지침 개발 및 적용 효과

김은희,김철규,이순교,김순덕,이혜옥,권정순,이경미,이민미,심순미,유용만,신종식,강은희,이상일,김병식,오성태,육정환,박수길 한국의료QA학회 2003 한국의료질향상학회지 Vol.10 No.2

Background : Gastric cancer is the most common malignant tumor in Korea. surgical operation is one of the major treatment modalities for gastric cancer patients. Therefore, gastrectomy is one of the most common procedures in General Surgery. There were variation in length of hospital stay and medical treatment for gastrectomy between three surgeons at Asan Medical Center. Clinical pathways have received considerable attention as a tool for recucing the medical practice variation, increasing the efficiency of care process, and improving the quality of care. The aim of this study was to evaluate the effect of a clinical pathway for gastrectomy in gastric cancer patients. Methods : The clinical pathway for gastrectomy was developed and implemented by a multidisciplinary group in Asan Medical Center. A computerized clinical pathway program was developed and revised after a pilot test. A total of 145 patients underwent gastrectomy by three surgeons at Asan Medical Center. We compared the length of hospital stay, patient satisfaction, and unplanned readmission rate between the pre-pathway group(n=67) and the post-pathway group(n=78). We also investigated the degree of satisfaction among the physicians and nurses who were main end-users of the clinical pathway. Results : The clinical pathway was applied to all target patients. The average length of hospital stay was shortened from 12.7days to 10.6days(p<0.01). The degree of patient satisfaction with the care process changed from 90.3% to 89.2% after the implementation of the clinical pathway, but the difference was of satistically significant(p=0.761). Unplanned readmission rate was 2.9% in the pre-pathway group. More than 90% of physicians and nurses answered that the clinical pathway had been a useful tool in their medical practice. Conclusions : The findings of the study demonstrated that implementation of the clinical pathway for gastrectomy produced substantial reduction in the length of hospital stay while improving the quality of patient outcomes. The computerized clinical pathway program can be used as one of the powerful patient management tools for reducing the practice variations and increasing the efficiency of care process in Korea hospital settings.

관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

Half-Heusler TiCoSb1-xSnx 합금계의 기계적 합금화에 의한 합성

어순철 忠州大學校 2012 한국교통대학교 논문집 Vol.47 No.-

Half-heusler TiCoSb1-xSnx (0.00≤x≤0.05) alloys were prepared by mechanical alloying of elemental powders, and consolidated by vacuum hot pressing. Phase transformations during mechanical alloying and hot consolidation were investigated using XRD and SEM. Single phase of Half-heusler phases were successfully produced in all doping ranges in as-milled state, but a little fraction of CoSb phase appeared after hot pressing. The process can be an alternative processing route for the synthesis of thermoelectric Half-heusler compounds.

기계적 합금화로 제조한 half-Heusler ZrNiSn1-xSbx 합금에서의 캐리어 이동 특성

어순철 忠州大學校 2011 한국교통대학교 논문집 Vol.46 No.-

Half-heusler ZrNiSn1-xSbx (0.02≤x≤0.08) alloys were prepared by mechanical alloying of elemental powders, and consolidated by vacuum hot pressing. Single phase of the Sb doped ZrNiSn was successfully produced in all doping ranges without subsequent annealing. Phase transformations during mechanical alloying and hot consolidation were investigated using XRD and SEM. Thermoelectric properties as functions of temperature and Sb contents were evaluated for hot pressed specimens. Their doping effect on the thermoelectric and the transport properties were examined. The Hall and Seebeck coefficients confirmed that all the Sb doped compositions exhibited n-type conduction. Relatively high carrier concentration and medium mobility were observed. Sb doping up to x=0.04 in ZrNiSn1-xSbx was shown to be effective on thermoelectric properties, and the figure of merit (ZT) was shown to reach to the maximum at x=0.02 in this study.

자발성 뇌실내출혈 환자에서 임상적 -전산화단층촬영상소견의 상관관계

황선철,김범태,장재칠,주교성,신원한,최순관,변박장 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.6

Toner Control Dr. Blade용 세라믹 용사코팅 조도에 미치는 공정변수의 영향

魚淳喆 충주대 2001 한국교통대학교 논문집 Vol.36 No.1

Thermal spray coating process has proven to be effective at producing hard, dense, wear resistance coatings on the relatively mild and tough substrates.Since the roughness is an important factor in wear resistance applications such as toner controller, and thus the effect of process parameters on the subsequent roughness becomes a matter of consideration in ceramic thermal spray coating.The effects of several process parameters on the roughness and related properties in tungsten carbide coatings have been investigated and correlated with microstructures in this study.The results indicated that the desired roughness can be controlled by appropriated particle size and distribution along with proper process conditions.

일부지역 중·고등학생들의 흡연실태 조사연구

신옥순,남철현,김복용,최연희,박선희,박경옥,구재희 慶山大學校 保健福祉硏究所 2002 保健福祉硏究 Vol.7 No.-

This study was conducted to examine aspects of middle and high school students' drinking and smoking with analysis of related factors. The subjects of this study was 540 students in Kyungbuk Province. Data were collected from July, 2002 to September, 2002. The results of this study can be summarized as follows. 1. 43.6% of the boy students experienced smoking, while 12.2% of the girl students experienced it. 5.3% of the students at academy schools experienced smoking, while 44.7% of the students at vocational schools experienced it. 11.4% of the middle school students experienced smoking, while 33.9% of the high school students experienced it. 15.5% of them who lived in towns or villages experienced smoking and 38.3% of them who lived in small or medium sized cities experienced it.37.5% of the students who belonged to the lower economic class experienced smoking and 20.7% of the students who belonged to the upper economic class experienced it. 24.0% of the students who belonged to the middle economic class experienced it. It appears that the respondents showed significantly different smoking experience rates by gender, school types, grades, the number of family members, residences, and economic classes. 2. 14.5% of the respondents who lived with grandparents and parents experienced smoking and 26.5% of them who lived with parents experienced it. The smoking rate was significantly high in the groups of having one-parent, being unsatisfied with family life, making poor grades in studies, and having the father or the mother working as a salesperson. 3. 45.3% of the respondents who were unsatisfied with family life experienced smoking. The smoking rate of the respondents who were unsatisfied with it was significantly higher than that of the other groups. On the other hand, the smoking rates were not significantly different by daily life, schoolmate relation, health condition, and feeling stress. 4. According to smoking rate by frequency of drinking, 16.4% of the respondents who drank less than once a month smoked and 54.8% of them who drank more than twice a month smoked. The more frequently they drank, the higher their smoking rate was. Those who did exercise displayed significantly higher smoking rate than those who did not do exercise. Among the rates of the respondents' agonies, family disharmony was 50.5% and love problem was 39.2%. Economic condition preblem was 34.6%. It appeared that smoking was most influenced by the family disharmony. 5. The factors significantly influencing smoking experience were gender, school grade, schoolmate relation, score in studies, and exercise. From above results, it can be concluded that the students' smoking is a serious problems which can be resolved by simple approaches because it is interrelated complicatedly with gender, grade, family, school, etc. Schools, related organizations, and the government must closely work together to maximize the effectiveness of policy implementation concerning the smoking and drinking problem of the middle and high school students.

鳳樵 張承熙 先生의 삶과 詩世界

申順澈 서라벌대학 2001 논문집 Vol.20 No.-

부분고정단을 갖는 보의 응력해석

김순철,문연준 東新大學校 工業技術硏究所 1999 工業技術硏究 Vol.5 No.-

When stress analysis are performed, the supports of all structures are assumed to be either frictionless pinned or completely fixed. However, these types of supports are rare in practice. The beams or girders found in steel frames are neither hinged nor fixed at their ends. For the stress analysis of a beam with partially fixed ends, Timoshenko's restraint factor is combined with Kinney's fixity factor. Here in this paper, the finite element method is used for the study of stress analysis of the beam with partially fixed ends. The results by finite element method show good agreement with those by other studies.