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SKD11 冷間金型材의 熱處理에 따른 機械的 性質의 向上에 대하여
吳應源,安幸根,梁權承 조선대학교 동력자원연구소 1988 動力資源硏究所誌 Vol.10 No.2
In order to study the change of properties of SKD11 for Cold-Working Die Steel with the various heat treatment, the change of microstructures, hardness, carbide precipitations, amounts of retained austenite and impact value have been investigated. The optimum solution temperature is 1000℃ in case of oil quenching, and is 1050℃ in case of air cooling on considering impact value. In case of high-temperature tempering the hardness is not reduced greatly due to secondary hardening by carbide precipitaion. The value of Charpy impact is high in case of air cooling after holding at 1050℃ for 1/3hr. Considering the hardness and toughness, however, the air cooling after holding at 1050℃ for 1/3hr is appropriate for tool die steels. The value Charpy impact increases by 550℃ tempering treatment.
치위생 교육과정 개발을 위한 치과위생사의 직무현황 및 교육요구도 분석
김응권 ( Eung Gwon Kim ),임순환 ( Soon Hwan Lim ),권미영 ( Mi Young Kwon ),최영윤 ( Young Yuhn Choi ),한지형 ( Ji Hyoung Han ) 한국치위생과학회 2014 치위생과학회지 Vol.14 No.1
본 연구는 치과병ㆍ의원에 근무하는 치과의료 종사자 144명을 대상으로 치과위생사 업무의 수행빈도와 중요도 및 교육의 필요성을 알아봄으로써 치위생 교육과정을 개발하는 데 참고자료가 되고자 실시하였다. 분석은 PASW Statistics 18.0을 이용하였으며, 다음과 같은 결론을 얻었다. 응답자가 생각하는 직무별 수행빈도와 업무의 중요도, 교육의 필요성 정도를 알아본 결과 수행빈도는 경영관리지원이 4.14, 예방치과처치는 3.51, 치과진료협조는 3.41, 구강보건 교육은 3.28 순을 보였다. 업무의 중요 정도 및 교육의 필요성은 경영관리지원, 치과진료협조, 예방치과처치, 구강보건 교육 순이었다. 일반적 특성에 따른 직무별 수행빈도를 살펴본 결과 변수 간 유의미한 차이가 없었다. 일반적 특성에 따른 직무별 업무의 중요도를 살펴본 결과 구강보건교육은 연령에 따라 40대(p<0.05)가, 치과진료협조는 직종에 따라 치과위생사(p<0.05)가, 경영관리지원은 여자(p< 0.05)와 치과위생사(p<0.05)가, 또한 경력이 많을수록 중요하다고하였다(p<0.05). 일반적 특성에 따른 직무별 교육의 필요성을 예방치과처치는 성별에 따라 여자(p=0.014)가, 치과진료협조는 여자(p<0.001)와, 치과위생사(p<0.001)가, 경영관리지원은 지역에 따라 서울(p<0.05)이 가장 높았다. 수행빈도와 업무의 중요도, 교육의 필요성의 관련성을 알아본 결과 업무의 중요도와 교육의 필요성이 가장 높은 관련성을 보였다. 이상의 결과 현재 임상에서는 치과위생사의 업무영역 중 경영관리지원과 치과진료협조를 중요하게 생각하고 있으며, 직무역량을 기대하고 있다. 따라서 치위생 교육과정 개발 시 경영관리 및 진료협조에 대한 업무의 과목을 적절히 안배하고 임상에서 요구하는 치과위생사가 될 수 있도록 직무능력을 표준화시켜야 할 것이다. In this study we analysed frequency and importance of tasks, and education needs of 114 people working in dental clinics to be a reference of dental hygiene curriculum development. The results are as follow: The order of performance frequency is management support, preventive dental treatment, dental treatment assistance and oral health education, and the order of importance level of tasks and education needs is management support, dental treatment assistance, preventive dental treatment and oral health education. There is no statistically significant difference of performance frequency by general characteristics. The tasks considered most important level depending on general characteristics are oral health education in age of 40s (p<0.05), dental treatment assistance in dental hygienists (p<0.05), management support in women (p<0.05), dental hygienists (p<0.05), and more experienced workers (p<0.05). The most need for Educations depending on general characteristics are oral health education in women (p< 0.05), dental treatment assistance in women (p<0.001) and dental hygienists (p<0.001), and management support in Seoul region (p<0.05). The importance of tasks and education needs have correlations. The results showed management support and dental treatment assistance are considered important in dental clinics and most needed job competency for dental hygienists.
망상형 회전식 바실러스 접촉장치를 이용한 하수의 고도처리공정에 관한 연구
김응호 ( Kim Eung Ho ),조연제 ( Jo Yeon Je ),박성주 ( Park Seong Ju ),신광수 ( Sin Gwang Su ),임수빈 ( Im Su Bin ),정진권 ( Jeong Jin Gwon ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.2
A new technology for advanced wastewater treatment was developed using a modified Rotating Biological Contactor (RBC) process, named as Rotating Activated Bacillus Contactor (RABC) process that utilizes Bacillus sp., the facultatively anaerobic or activated microaerophilic bacteria on multiple-stage reticular rotating carriers, as a predominant species. The RABC process for a municipal wastewater with relatively low concentrations of organics, nitrogen, and phosphorus showed stable and high removal efficiencies, less than BOD_(5) 10 ㎎/L, T-N 15 ㎎/L, and T-P 1.5 ㎎/L in final effluent. The performance load of RABC process was shown to be 1.23 ㎏·BOD/㎡·day for the first stage (average 0.31 ㎏·BOD/㎡·day for the total stages) based on both removed BOD and converted disc area corresponding to the reticular one. The sludge produced in the RABC process is characterized by low generation rate (about 0.18㎏·MLSS/㎏·BOD) and excellent settleability. The number ratio of Bacillus (2.4×10(6)) CFU/ml) to heterotrophic bacteria ( 3.6×10_(7) CFU/ml) inhabiting in the biofilms of the RABC process was 6.7%, indicating that Bacillus sp. was a predominant species in the biofilms. The RABC process with reticular rotating carriers showed its excellent performance for the advanced wastewater treatment without any offensive odor problem due to organic overloading.