• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.1140-1147
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• 2009

Productivity measurement of construction machinery is a significant issue faced by many contractors especially those involved in earthwork projects. Traditionally, equipment production rate has been estimated using data available in manufacturers' catalogues, results of previous construction projects, or personal experience and assessments of the site personnel. Actual production rates obtained after the completion of a project demonstrate the fact that most of these methods fail to provide accurate results and as a direct consequence, may lead to unrealistic project cost estimations prepared by the contractors. What makes this more critical is that in most cases, inadequate cost estimations lead the entire project to exceed the initial budget or fall behind the schedule. In this paper, a linear regression method to estimate bulldozer productivity is introduced. This method has been developed using SPSS-16 software package. The presented method is used to estimate the productivity of Komatsu D-155A1 series which is commonly used in many earthmoving operations in Iran. The data required for the numerical analysis has been collected from actual site observation and productivity measurement of 60 pieces of D-155A1 series currently being used in several earthmoving projects in Iran. Comparative analysis of the output data of the presented regression method and the existing productivity tables provided by the manufacturer shows that when compared to the actual productivity data collected on the jobsite, a significant increase in accuracy and a remarkable reduction of data variance can be achieved by using the presented regression method.

• 국제학술발표논문집
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• The 9th International Conference on Construction Engineering and Project Management
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• pp.484-491
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• 2022

A paradigm shift in teaching modular construction in higher education and K-12 is proposed as a means to increase the future adoption of the modular construction technique. To this effect, a new education module is presented to STEM educators. This education module is based on LEGOs and directed towards educators in the architecture, engineering, and construction (AEC) industry. The main objectives of the education module are to increase interest and knowledge of modular construction, acknowledge the benefits of using 3D design with 4D scheduling, and create a simulating hands-on educational opportunity. The education module is designed to allow participants to experience a hands-on simulation of modular construction and stick-built construction through building a LEGO project. Participants are challenged to find the advantages and disadvantages in both construction systems first-hand and record their findings. Results are presented from the preliminary testing of this education model on a group of construction management students at the University of Nevada, Las Vegas. Overall, the survey results showed that the LEGO education module was successful at achieving the project's three main objectives: 1) increasing the participants' interest and knowledge of modular construction through an interactive project; 2) increasing the participants' understanding of the benefits of 3D design with 4D scheduling over the use of 2D drawings; and 3) creating a simulating hands-on educational opportunity to help participants compare modular construction to stick-built construction. In the end, this proposed a new LEGO education module addressing the problems identified from this study with more participants.

• 가정∙방문간호학회지
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• 제30권1호
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• pp.15-25
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• 2023

Purpose: This study describes the associations between shift work factors, workplace violence bystander types, and the missed nursing care of hospital nurses. Methods: A cross-sectional survey was conducted among hospital nurses using structured questionnaires related to shift work factors, workplace violence bystander types, and missed nursing care. The study participants were 199 nurses caring for adult patients and working in two tertiary hospitals. Results: The missed nursing care of the participants showed a statistically significant positive correlation with the facilitating bystander (r=.40, p<.001) and abdicating bystander (r=.28, p<.001) among the workplace violence bystander types. However, rest time during duty showed a significant negative correlation (r=-.16, p=.026). A regression model with control variables (department and clinical career), shift work factors, and workplace violence bystander types explained approximately 25% of missed nursing care of the study participants. Further, the facilitating bystander type influenced the missed nursing care of hospital nurses. Conclusion: As a result of examining the associations between shift work factors, workplace violence bystander types, and missed nursing care of hospital nurses, it was confirmed that missed nursing care was influenced by the facilitating bystander type. It is necessary to improve the nursing culture within the department so that nurses do not behave as negative bystanders to workplace violence.

• Structural Monitoring and Maintenance
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• 제10권1호
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• pp.25-42
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• 2023

Despite the significance of ports as critical economic infrastructure, the berth facilities usually deteriorate due to heavy loading, unloading, aging, environmental weather conditions, marine growths, and lack of efficient maintenance management. Marine berths require proactive maintenance management to limit deterioration and defects as no berth facility is maintenance-free. Thus, delay in carrying out maintenance work for the marine berths can be devastating to the operational process involving ship entry, loading, and unloading operations. The aim of this research is to coordinate both operations work, and maintenance works that take place inside the berth of a local industrial port in Saudi Arabia, by developing a novel framework that integrates both works without affecting the efficiency and functionality of the berth. The study focused on defining the operational process of the port and identifying the elements with direct and indirect effects. In addition to determining the priority for the entry of ships inside the berth, it also identified the factors involved in designing a framework that included maintenance work as a component of the monthly berth occupancy schedule. By applying a mathematical model, a framework was established, which includes all the important elements of the process. As a result of the mathematical method formulation process, a database was designed that organizes and coordinates the operations of all berths within the port. This creates time to carry out the required maintenance work monthly as well as ease of coordination with the contractors responsible for the implementation of those works.

• 한국비블리아학회지
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• 제19권2호
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• pp.165-186
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• 2008

본 연구의 목적은 도서관활용수업 활성화를 위한 정보활용능력과 교과 교육과정의 연계 전략으로써 교육 공동체 구성하기-수업전략 세우기-학습지 평가지 개발하기의 적용 사례를 제시하는 것이다. 본 사례에서는 교육 공동체에 10학년 국어, 국사, 한국지리 교사와 사서교사가 참여하였다. 그리고 교과 간 관련성을 가진 통합 학습주제를 개발하고 도서관활용수업 운영 전략을 설계하였다. 끝으로 정보문제 해결모형과 학습자료 이용 모형을 포함하는 학습지와 평가지를 개발하였다. 이 방법은 학생들에게 학습자료를 이용할 수 있는 충분한 시간을 제공할 수 있다. 그리고 정보활용능력을 체계적으로 지도하는데 도움이 될 것으로 보인다. 또한 사서교사가 학습 공동체에서 리더십과 파트너십을 향상하는데 도움을 줄 수 있다.

• 임상간호연구
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• 제29권3호
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• pp.271-282
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• 2023

Purpose: This study is a descriptive research study attempted to identify the job stress and positive psychological capital of clinical nurses and to identify the factors that impact job embeddedness. Methods: Data were collected from 115 nurses with over one year of clinical experience working at a 500-bed B General Hospital. The collected data were analyzed with the SPSS 27.0 program using frequency and percentage, mean and standard deviation, Independent t-test, One-way ANOVA, Scheffé test, Pearson's correlation coefficients, and multiple linear regression. Results: As a result of multiple regression analysis, hope among the sub-factors of positive psychological capital (β=0.48, p<.001), matters related to the work schedule (β=-0.23, p=.005) among the sub-factors of job stress, and conflict with doctor (β=0.20, p=.013) was found to have an impact on job embeddedness, and the explanatory power of this regression model was 52.0% (F=13.12, p<.001). Conclusion: It was found that the positive psychological capital of clinical nurses has a positive impact on job embeddedness. In order to increase the job embeddedness of clinical nurses, it is necessary to develop, educate, and utilize specific intervention programs that can strengthen positive psychological capital. Efforts should be needed to prepare specific strategies for nurses to recognize the importance of hope and actively utilize positive psychological capital. In addition, it is necessary to create an organization-level working environment and continuous management to reduce the job stress of clinical nurses.

• 국제학술발표논문집
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• The 4th International Conference on Construction Engineering and Project Management Organized by the University of New South Wales
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• pp.561-566
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• 2011

In general, the early stage of urban renewal such as preparing a master plan and processing administrative works including planning permission are conducted by local governments in Korea. The local governments need to review the status of projects that are undergone in other local governments' territories. However, no integrated information system to manage information to this end at the level of nation exists in Korea. If the system would be developed, it may support central government to obtain information on required resources at the national level. In addition, local governments can gain guidance on the process and recognize potential problematic situations from others experience. The system should include functions to collect data on project summary, cost and schedule of projects according to local governments. The expected effects from using the information system are as following. First, information generated from project practice become more credible on account of management at the national level. Because the authorized party such as system administrative agents of governments are responsible for collecting and managing data. Second, the unified information system with no regard to the place where projects progresses reduces the efforts for accumulating reference data for aiding local governments decision making by providing appropriate information timely. Also, enhanced information accessibility for stakeholders make the project process clear. Finally, oversight management is enforced with visualization technology adopted in the system, presenting master plan and mass model including information on usage by floors and progressing information graphically. Ultimately, potential challenges can be anticipated by considering records accumulated from other local governments' projects. This paper presents concept, functionalities, and architecture of information system enabling to manage data from individual projects and aggregate those for oversight management for local and central governments. As a part of systems analysis, general requirements of briefing system for governments and necessary data fields to this end are identified.

• 한국컴퓨터정보학회논문지
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• 제29권7호
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• pp.1-9
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• 2024

본 연구에서는 부트 스톰을 완화하고 서비스 안정성 향상을 위하여 AI 기반 VDI 사용 예측 시스템, 가상머신 부팅 스케줄러 시스템으로 구성된 부트 스톰 완화 방안인 BRAIDS를 제안한다. 가상 데스크톱 인프라(Virtual Desktop Infrastructure, VDI)는 조직의 업무 생산성 향상과 IT 인프라 효율성 증대를 위한 중요한 기술이다. 다수의 가상 데스크톱이 동시 부팅될 때 발생하는 부트 스톰은 성능저하와 대기 시간 증가를 유발한다. xgboost 알고리즘을 사용하여, 기존 VDI 사용 데이터를 활용하여 향후 VDI 사용량을 예측한다. 또한 예측된 사용량을 입력으로 받아 VDI 서버와 가상머신의 하드웨어 사양을 고려하여 부트 스톰을 정의하고, 부트 스톰을 완화하기 위하여 순차적으로 가상머신을 부팅할 수 있는 스케줄을 제공한다. 사례연구를 통하여 VDI 사용 예측 모델은 높은 예측 정확도와 성능 향상을 보였으며, 가상머신 부팅 스케줄러를 통하여 가상 데스크톱 환경에서의 부트 스톰 현상을 완화하고 효율적으로 IT 인프라를 활용할 수 있음을 확인하였다.

• 지질공학
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• 제24권2호
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• pp.217-225
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• 2014

대규모 수막재배 시설은 동절기 수막재배 기간 동안 군집 취수정의 영향으로 지하수위가 하강하고 이로 인해 지하수 취수량 확보에 어려움을 겪고 있다. 본 연구에서는 동절기 수막재배지역에서의 집중취수에 따른 정밀한 지하수위 변화 분석을 수행하고자 한다. 대상지역인 청원군의 수막재배지역을 포함한 소유역의 지하수 유동을 모의하기 위해 3차원 유한차분모형인 MODFLOW를 구축하였으며, 중요한 입력자료인 지하수 함양량 시계열 자료는 유역수문모형 SWAT모형을 이용하여 구하였다. 여기에 수막재배지의 일최저기온과 취수가동시간과의 관계를 통해 지하수 이용량을 추정한 선행 연구(Moon et al., 2012)를 참고하여 취수계획을 수립, 지하수 모델링에 반영하였다. 부정류 모델링의 적합도를 평가하기 위해 동절기의 모의된 지하수위 강하 패턴을 관측지하수위 자료와 비교하였다. 모델링 기간은 수막재배가 본격적으로 이루어지는 2012년 11월부터 2013년 3월까지의 107일간으로 정하였다. 모의결과 동절기 지하수위 관측값과 비교적 유사한 지하수 하강을 재현할 수 있었고, 일최저기온을 이용한 취수계획방식이 다른 수막재배지역의 지하수 유동해석에도 적용가능할 것으로 판단되었다.

• 한국수자원학회논문집
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• 제33권6호
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• pp.745-755
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• 2000

현재 우리나라에서 홍수조절 업무에 황용하고 있는 홍수관리시스템은 댐에서 조절이 불가능한 댐하류부 수문현상들을 고려하여 방류계획을 수립할 수 없으며, 예측 강우량에 의한 댐으로의 유출상황을 고려한 예비방류에 관한 지침이 마련되어 있지 않다. 따라서 본 연구에서는 댐의 제약조건 댐 상.하류의 유출상황을 고려하여 홍수기 댐을 운영 할 수 있는 모의기법에 의한 모형을 개발하였다. 개발된 모형(EV ROM이라 명명)은 댐에서 조절이 불가능한 댐하류 지류에 의한 하류 홍수제어 지점의 Cumulative Lateral Flow Hydrograph를 고려하여 방류계획을 수립한다. EV ROM에서는 댐하류 지역의 첨두홍수량 경감을 위하여 홍수제어지점의 수문곡선 상승부에서 예비방류를, 첨두부에서는 댐에 저류를 하였다가 수문곡선 하강부에 다시 방류를 수행하는 특징이 있다. EV ROM을 강우-유출모형에 결합하여 금강수계 대청댐을 중심으로 3개 홍수사상에 적용해 본 결과, 기존의 Rigid ROM이나 Technical ROM 보다 우수한 것으로 나타났다. 이는 본 연구에서 개발한 EV ROM이 댐 유역뿐만 아니라 댐하류 홍수제어지점의 수문상황을 동시에 고려하여 댐의 방류계열을 결정하기 때문이다. 따라서, 본 연구에서 개발된 EV ROM을 다양한 홍수사상에 적용, 예측강우량의 정확도 개선 및 프로그램의 보완이 이루어진다면, 현재보다 한차원 높아진 저수지운영을 기대 할 수 있을 것이다.