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최근호 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.6
본 연구에서는 종래 기술의 문제점을 해결하기 위하여 낮은 다분산성지수를 갖는 폴리에틸렌 왁스를 생산하기 위한 새로운 열분해법을 개발하였다. 새로운 열분해법의 특징은 반응단계 이전에 예비가열단계를 갖는 것이다. 예비가열단계는 원료의 열전도도를 증가시키기 위하여 반응온도(380-400℃)보다 낮은 온도(250-370℃)로 원료를 가열하여 그 온도에서 일정한 시간동안 유지하는 것을 의미한다. 효과적인 열전달을 위하여 특수하게 설계된 임펠러가 내부에 설치되어 있는 외부순환형 루프반응기와 새로운 열분해법을 사용하여 다분산성지수(3.90이하)가 낮은 폴리에틸렌 왁스를 5.40시간이내에 생산할 수 있었다. 예비가열단계의 온도가 제품의 다분산성지수, 내용물의 점도, 제조시간에 미치는 영향은 무시할 만하였다. 예비가열단계의 수를 증가시켜도 제품의 다분산성지수는 거의 변하지 않았다. 반응온도가 증가하면 내용물의 점도는 시간이 증가할수록 보다 빨리 감소하며 그것으로 인하여 반응시간은 감소하였다. 내용물의 점도는 반응시간이 증가함에 따라서 감소하였다. In this study, to solve the problems of previous techniques, a new thermal degradation method was used for producing polyethylene wax having a low polydispersity index. The thermal degradation method was characterized by putting the preheating stage before the reaction stage. At the preheating stage, to increase the thermal conductivity of raw material, the raw material was heated up to a certain temperature(250-370℃), which was lower than the reaction temperature(380-400℃), and was remained at that temperature for a certain time. Polyethylene wax with a low polydispersity index(less than 3.90) could be produced within 5.40 hr using both the thermal degradation method and an external-loop reactor in which specially designed impellers were installed for more effective heat transfer. The effect of the temperature of preheating stage on the polydispersity of product, the viscosity of medium and the manufacturing time was negligible. An increase in the number of preheating stage only marginally affected the polydispersity index of product. When the reaction temperature increased, the viscosity of medium was more rapidly decreased with time and, hence, the reaction time was decreased. The viscosity of medium was decreased with increasing the reaction time.
기-액분리기가 설치된 외부순환형 이중기포탑에서의 산소전달
최근호 大田工業大學 1992 한밭대학교 논문집 Vol.9 No.1
The application of an external-loop airlift reactor with a gas-liquid separator for oxy- gen transfer was experimentally examined. The gas-liquid separator was installed as the lower connection between riser and downcomer. The overall mass transfer coefficients in the external-loop airlift reactor with the separator (ELS) were higher than those in the ordinary airlift without the separator (EL) for high superficial gas velocity.
최근호,정석훈,이현실,서용무 대한의료정보학회 2010 Healthcare Informatics Research Vol.16 No.2
Objectives: This study sought to find answers to the following questions: 1) Can we predict whether a patient will revisit a healthcare center? 2) Can we anticipate diseases of patients who revisit the center? Methods: For the first question, we applied 5 classification algorithms (decision tree, artificial neural network, logistic regression, Bayesian networks, and Naïve Bayes) and the stacking-bagging method for building classification models. To solve the second question, we performed sequential pattern analysis. Results: We determined: 1) In general, the most influential variables which impact whether a patient of a public healthcare center will revisit it or not are personal burden, insurance bill, period of prescription, age, systolic pressure, name of disease, and postal code. 2) The best plain classification model is dependent on the dataset. 3) Based on average of classification accuracy, the proposed stacking-bagging method outperformed all traditional classification models and our sequential pattern analysis revealed 16 sequential patterns. Conclusions: Classification models and sequential patterns can help public healthcare centers plan and implement healthcare service programs and businesses that are more appropriate to local residents, encouraging them to revisit public health centers.
산재근로자들의 고용안정과 건강한 삶을 위한 데이터마이닝 기반의 규칙 도출 연구
최근호,서용무,유동희 한국직업재활학회 2015 職業再活硏究 Vol.25 No.3
The Workers’ Compensation system in Korea is expanding its role from medical treatment and compensation to rehabilitation, as increasing the rate of return to the job is an important issue for a five-year plan for rehabilitation development. To this end, this study develops three prediction models for industrial disaster workers. Each predicts whether the worker can return to his/her job, whether the worker can find a new job, and whether the worker will be healthy comparing to his/her health state before the industrial disaster occurred. In the first prediction model, 12 final influential input variables were used, among which ‘whether one kept a relationship with his/her owner during medical treatment’ was the most influential. In the second prediction model, 8 final influential input variables were used, among which ‘whether one received job-related education or training after medical treatment’ was the most influential. In the third prediction model, 4 final influential input variables were used of which ‘whether the period of medical treatment was appropriate’ was the most influential. The results of this study can help establish more personalized support service for industrial disaster workers to ensure their job security and healthy lives in the future. 본 연구에서는 산재 후 직업복귀율 제고와 안정적 직업복귀의 중요한 요인인 건강상태의 증진을 위해 데이터 마이닝 기법 중 하나인 의사결정나무 알고리즘을 활용하여 원직장 복귀가능 여부, 취업가능여부, 산재이전 대비 건강상태를 예측하는 모델들을 구축하고 분석하였다. 그 결과, 원직장 복귀가능 여부 예측에는 최종적으로 13개의 변수가 영향력이 높은 변수로 선정되었고, 이들 중 가장 영향력이 높은변수는 요양 중 사업주 및 사업장 인사노무 관련자와의 관계 유지 여부로 나타났다. 취업가능 여부 예측에는 영향력이 높은 8개의 변수가 최종 선정되었고, 가장 영향력이 높은 변수는 요양종료 이후 받은교육 및 직업훈련 경험으로 나타났다. 마지막으로 산재이전 대비 건강상태 예측에는 최종적으로 영향력이 높은 4개의 변수가 선정되었고, 가장 영향력이 높은 변수는 치료기간의 적정 여부로 나타났다. 본연구의 결과는 산재근로자의 고용안정과 건강한 삶을 위한 맞춤형 지원서비스 제공 방안 수립에 도움을 줄 것으로 기대된다.
구강악안면영역의 낭종에 대한 6년간의 후향적 임상 연구
최근호,장정록,박영준,문혜원,김영준,유민기,국민석,박홍주,유신열,오희균,Choi, Guen-Ho,Jang, Jung-Rok,Park, Young-Jun,Moon, Hyea-Won,Kim, Young-Joon,Yu, Min-Gi,Kook, Min-Suk,Park, Hong-Ju,Ryu, Sun-Youl,Oh, Hee-Kyun 대한악안면성형재건외과학회 2009 Maxillofacial Plastic Reconstructive Surgery Vol.31 No.5
Purpose : This study was designed to evaluate the clinical aspect of cysts which arised in the oral and maxillofacial region. Patients and Methods : We reviewed clinical record, radiograph, histopathologic and operative report of 155 patients who had been diagnosed as cysts and treated at the department of oral and maxillofacial surgery in Chonnam National University Hospital from January 2003 to December 2008. Gender, age, classifiaction, anatomic distribution, clinical sign and symptoms, treatment, complications and recurrence rate were studied. Results : 1. Among 155 patients, the male patients(64.5%) were more than the female(35.5%). 2. The average age ofthe patients was 37.2 years(ranging from 5 to 79 years). 3. In pathologic classification, radicular cyst and dentigerous cyst were most common cysts, irrespective of 73 cases(48.3%) and 35 cases(23.2%). 4. The frequently involved cystic regions were followed as mandibular molars(38.1%), and maxillary incisors(30.2%). 5. The frequent sequence of clinical symptoms was edema(29.9%), no symptom(18.9%), tenderness(13.9%), pain(11.5%) and abscess(9.4%). 6. The most prevalent treatment was the combination operation, such as cyst enucleation with extraction or endodontic treatment of the causative tooth(76.8%) 7. Among 155 cases, 2 cases that were treated using enucleation method were recurred(1.3%).