• 디지털콘텐츠학회 논문지
• /
• 제18권2호
• /
• pp.357-363
• /
• 2017

유닉스 운영체제의 아류로 여겨졌던 리눅스 운영체제는 엔터프라이즈 서버 시장의 대세로 자리 잡고 있으며, 클라우드 컴퓨팅 및 빅데이터 인프라 구축의 핵심으로 여겨지고 있다. 리눅스는 소스가 공개되어 있고, 누구나 자유롭게 수정 및 배포가 가능하다는 특징으로 인해 다양한 리눅스 배포판이 등장하였다. 다양한 배포판의 등장은 서버 시장을 시작으로 데스크톱 및 모바일 운영체제 시장도 장악하고 있다. 본 논문에서는 리눅스의 탄생과 역사를 살펴보고, 다양한 리눅스 배포판을 분류하고 특징을 분석하였다. 이렇게 다양한 리눅스 배포판의 등장은 사물인터넷 시대에서도 중추적인 역할을 수행하면서 세력을 더욱 확장할 것으로 사료된다.

• 과학교육연구지
• /
• 제46권3호
• /
• pp.312-325
• /
• 2022

이 연구의 목적은 인문사회계열 학생을 대상으로 한 교양 과학 수업에서 플립러닝 적용 사례와 함께 교양 과학 교과목의 수업 설계 과정에서 필요한 과학사 내용 체계를 제공하는데 있다. 연구를 위해 기존 운영중인 대학교 교양 과학 수업 및 과학사 수업의 실태를 분석하고, 다양한 선행연구 분석을 통해 플립러닝 방식을 적용한 '과학사의 이해' 교과목을 개발하였다. 과학교양교육의 본질적 목표에 도달할 수 있는 과학사 강의 목표로 지식의 습득과 다양한 역량 강화를 포함함과 함께 과학적 태도 함양을 설정하고 이를 고려하여 15주차의 내용 체계를 설계하였다. 구성된 '과학사의 이해' 내용 체계 중 '과학의 역사' 부분에 해당하는 4개의 주제는 플립러닝으로 수업을 구성하고 온라인 영상자료와 집단 토의 활동을 포함해 교수학습활동을 구성하였다. 인문사회계열 학생을 대상으로 강좌를 개설하고 56명의 대학생을 대상으로 수업을 운영한 결과 학생들의 과학에 대한 흥미와 인식이 높아진 것을 확인할 수 있었다. 이 연구의 사례를 통해 과학사 및 교양 과학 교육에 대한 교육적 시사점을 제공하였다.

• Corrosion Science and Technology
• /
• 제7권1호
• /
• pp.16-21
• /
• 2008

A non-phosphorous program employing an alkyl epoxy carboxylate (AEC) has been successfully applied to petrochemical and other large industrial open recirculating cooling water systems. AEC is a patented non-phosphorous calcium carbonate scale inhibitor that has demonstrated better scale inhibition abilities than traditional organic phosphonates. In addition to its antiscalant properties, AEC inhibits carbon steel corrosion when used at high dosages. AEC can be combined with zinc to form a non-phosphorous program with very low levels of phosphate to provide an environmentally acceptable program. In actual applications, the total phosphate developed in the cooling system from cycling the makeup is below 1 ppm as $PO_4$. This level has complied with the highest standards of wastewater discharge limitations. The performance of two AEC/Zinc applications is reviewed. In both cases excellent corrosion and scale control were achieved with AEC/Zinc programs. One case history details the performance with a low hardness water (100 ppm calcium, as $CaCO_3$) operating at 8-10 cycles of concentration. The corrosive nature of the water and the long retention time of the system stressed both the corrosion and scale control capabilities of the program. The second case history demonstrates the performance of the program with a moderate hardness water (400-600 ppm calcium, as $CaCO_3$), but under harsh conditions of high temperature and low flow. The AEC/zinc combination has been found to be highly effective in controlling the corrosion of ferrous metals. AEC can provide good corrosion inhibition at high concentrations, while zinc is known to be an excellent cathodic inhibitor. The combination of the two inhibitors not only provides a synergistic blend that is effective over a wide range of operating conditions, but also is environmentally friendly.

• 간호행정학회지
• /
• 제18권4호
• /
• pp.357-373
• /
• 2012

Purpose: The purpose of this study was to define the experience of nursing education in the Jinju area of Gyeongsang-Namdo from the 1940s to 1960s. Methods: An oral history study was done using personal interviews with 8 nurses who graduated in nursing in Gyeong Nam area during the period under study. Results: In this study, the individual's educational background before entering the nursing school, school life, and life as a nurse after graduating from nursing school were defined. Conclusion: For most of the respondents, their educational background before entering nursing school was middle school. They studied very hard in poor surroundings. After graduation from a nursing school, they worked in hospitals, public health centers, midwifery centers, and schools. Half of the respondents had experience as a midwife. Their income as a midwife was relatively high at that time. They all had positive identities and lived a life devoted to the individual, society, and the nation.

• 정보처리학회논문지A
• /
• 제15A권1호
• /
• pp.17-26
• /
• 2008

본 논문에서는 WSN(wireless sensor networks)과 RFID(radio frequency identification) 시스템을 통합하여 이용할 수 있는 통합 RFID 미들웨어에서의 효과적인 캐슁 기법을 제시한다. 통합 RFID 미들웨어가 운영되는 환경은 연결된 RFID리더로부터 대규모의 데이터가 입력되고, 다수의 무선 센서로부터 끊임없이 데이터가 입력되는 상황을 가정하고 있으며 또한 특정 목적을 위해 과거에 센서로부터 입력되어 분산 저장되어 있는 히스토리 데이터도 활용될 수 있음을 가정하고 있다. 따라서 캐슁 기능을 구비한 특정 미들웨어 레이어에서 센서 노드로부터 수신되는 연속 데이터와 분산 저장되어 있는 히스토리 데이터에 대한 신속한 질의 및 응답을 위한 효율적 데이터 처리가 절실히 요구된다. 이를 위하여 본 논문에서 제안되는 캐슁 기법은 기존의 캐슁 기법 기반으로 통합 RFID 미들웨어에 특화하여 데이터 처리의 효율을 높이기 위하여 두가지 방법을 제시하고 있으며, 이는 처리 데이터의 유형에 따라 DSC(data stream cache)와 HDC(history data cache) 로 구분된다. 제안된 캐슁 기법은 다양한 파라미터를 이용한 실험을 통하여 신속한 질의 및 응답이 이루어짐을 보여주고 있다.

• 한국안전학회지
• /
• 제24권2호
• /
• pp.17-22
• /
• 2009

Thermal stress and elastic creeping stress analysis was conducted by finite element method to simulate start-up process of a boiler header of 500MW standard fossil power plant. Start-up temperature and operating pressure history were simplified from the real field data and they were used for the thermal stress analysis. Two kinds of thermal stress analysis were considered. In the first case only temperature increase was considered and in the second case both of temperature and operating pressure histories were considered. In the first analysis peak stress was occurred during the temperature increase from the room temperature. Hence cracking or fracture may occur at the temperature far below the operating maximum temperature. In the results of the second analysis von Mises stress appeared to be higher after the second temperature increase. This is due to internal pressure increase not due to the thermal stress. When the stress components of radial(r), hoop($\theta$) and longitudinal(z) stress were investigated, compression hoop stress was occurred at inner surface of the stub tube when the temperature increased from room temperature to elevated temperature. Then it was changed to tension hoop stress and increased because of the operating pressure. It was expected that frequent start-up and shut-down operations could cause thermal fatigue damage and cracking at the stub tube hole in the header. Elastic-creeping analysis was also carried out to investigate the stress relaxation due to creep and stabilized stress after considerable elapsed time. The results could be used for assessing the creep damage and the residual life of the boiler header during the long-tenn service.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제23권3호
• /
• pp.39-46
• /
• 2017

Purpose: Here is little information about China's operation department of general hospital in Korean medical architecture papers, which is inconvenient for scholars engaged in medical building research and comparison. Furthermore, Surgery is to provide patients with surgery and rescue sites, is an important technical department of the hospital, and then with the development of medical technology and people's trust in medical science, the role of the operating room will become increasingly important. Therefore, the purpose of this research is to analyze history, changes and definitions of the operating room and China's operation department of general hospital related laws and regulations for future research to provide effective analysis of data, and find shortcomings. Methods: This research was conducted according to the relevant laws, books, and papers of the operation department of Chinese general hospital. Results: At present hospital construction in China is in the period of rapid development and coupled with the growing medical technology, operating room layout and configuration is still in the continuous trial of continuous improvement stage. Overall, it requires more detailed guidelines to improve the quality of the operating room. Implications: Implications: It is expected that the research of this paper will provide an effective reference for the future research of the operation department of China General Hospital, which can promote and improve the work system of the operation department of China General Hospital.

• 한국병원경영학회지
• /
• 제25권4호
• /
• pp.76-93
• /
• 2020

Purpose: In this study, the general characteristics of subjects who spent more than a certain amount of cost for general medical examination at the general hospital health promotion center, and the characteristics of disease, family history, and lifestyle (smoking, alcohol, physical activity, oral care) significantly differed in cost expenditure. We intend to provide basic data for establishing an appropriate marketing strategy for comprehensive examination. Method: It was conducted for users who received comprehensive checkups at a health promotion center at a general hospital in Seoul. The research data collection period is for 979 people who performed comprehensive examinations from January 2019 to December 2020. In order to carry out a comprehensive examination, a questionnaire before the examination was distributed to the subjects who visited the hospital to prepare, and the investigation was conducted in a way that the subjects of the investigation directly filled in. Results: There was a significant influence on the difference in expenditure for comprehensive examination according to the gender, age, and type of health insurance of the subject. In addition, there were significant differences in expenditure according to the presence or absence of disease and the type of family history. Weight loss, smoking history, smoking period, smoking frequency, drinking history, and drinking frequency all had significant effects on cost expenditure. Also, strength training and oral treatment management showed a significant effect on the cost of comprehensive examination. The number of flossing and interdental brushing was also found to have a significant effect. According to the results of multiple regression analysis, disease history (t=2.683, p<.01) and mean smoking frequency (t=4.315, p<.001) appeared to have the most significant effect on expenditure statistically. In other words, when the subject has a history of disease and when the average number of smoking is large, it means that the comprehensive examination cost is remarkably large. Conclusion: By using these contents, hospitals can further refine the marketing of the examination center. In addition, a more convenient and specialized process should be used by patients by linking the general medical department and the examination center well. In terms of management of operating medical institutions, this can be expected to create patients and increase profits.

• 건축역사연구
• /
• 제15권3호
• /
• pp.7-25
• /
• 2006

This research examines symbolic meanings of architectural style of Japanese ruling era of Korea through analysis of Expo buildings. Expo buidings of Joseon Product Evaluation Expo(1915), Joseon Expo(1929), and Joseon Grand Expo(1940) are chosen as subjects of this research. Expos held in Korea since 1945 were creatures of colonial reign and their objectives are advertising the advancement of Japan. New and latest architectural styles of Western countries were used as a symbol of advancement in non-western countries. Renaissance style and Secession style in Joseon Product Evaluation Expo and Modernism style in Joseon Expo were introduced as architectural styles that symbolize advancement. On the contrary, the traditional architectural style of Joseon Dynasty was distorted as symbol of backwardness. Latest Western Architectural Styles were used elaborately and Intentionally to symbolize advancement and industrialization by Japanese ruling power and companies. Specially, Modernism style operating as 'symbol of advancement' is characteristic of non-western society in attempt to proceed Modernization through Westernization. Also, it can be suggested that architectures in Modernism style are used in ways to symbolize the advancement of the colonial reign authorities within the colonial society.

• International Journal of Naval Architecture and Ocean Engineering
• /
• 제10권3호
• /
• pp.385-392
• /
• 2018

This paper presents 2D numerical modeling to calculate ship-ice interactions that occur when an icebreaker advances into ice-covered water. The numerical model calculates repeated icebreaking of an ice plate and removal of small ice floes. The icebreaking of the ice plate is calculated using a ship-ice contact detection technique and fluid-structural interaction of ice plate bending behavior. The ship-ice interactions in small ice floes are calculated using a physically based modeling with 3DOF rigid body equations. The ice plate is broken in crushing, bending, and splitting mode. The ice floes drift by wind or current and by the force induced by the ship-ice interaction. The time history of ice force and ice floe distribution when an icebreaker advances into the ice-covered water are obtained numerically. Numerical results demonstrate that the time history of ice force and distribution of ice floes (ice channel width) depend on the ice floe size, ship motion and ice drifting by wind or current. It is shown that the numerical model of ship maneuvering in realistic ice conditions is necessary to obtain precise information about the ship in ice-covered water. The proposed numerical model can be useful to provide data of a ship operating in ice-covered water.