• International conference on construction engineering and project management
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• 2013.01a
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• pp.359-366
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• 2013

Although many research efforts have been conducted to address the effect of crew members' work skills (e.g., technical and planning skills) on work performance (e.g., work duration and quality) in construction projects, the relationship between skill and performance has generated a great deal of controversy in the field of management (Inkpen and Crossan 1995). This controversy can lead to under- or over-estimations of the overall project schedule, and can make it difficult for project managers to implement appropriate managerial policies for enhancing project performance. To address this issue, the following aspects need to be considered: (a) work performances are determined not only by individual-level work skill but also by the group-level work skill affected by work team members, each member's role, and any working behavior pattern; (b) work planning has significant effects on to what extent work skill enhances performance; and (c) different types of activities in construction require different types of work, skill, and team composition. This research, therefore, develops a system dynamics (SD) model to analyze the effects of both individual-and group-level (i.e., multi-level) skill on performances by utilizing the advantages of SD in capturing a feedback process and state changes, especially in human factors (e.g., attitude, ability, and behavior). The model incorporates: (a) a multi-level skill evolution and relevant behavior development mechanism within a work group; (b) the interaction among work planning, a crew's skill-learning, skill manifestation, and performances; and (c) the different work characteristics of each activity. This model can be utilized to implement appropriate work planning (e.g., work scope and work schedule) and crew management policies (e.g., work team composition and decision of each worker's role) with an awareness of crew's skill and work performance. Understanding the different characteristics of each activity can also support project managers in applying strategic work planning and crew management for a corresponding activity, which may enhance each activity's performance, as well as the overall project performance.

• The Korean Journal of Health Service Management
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• v.11 no.1
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• pp.107-115
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• 2017

Objectives : The purpose of this study was to examine the relationship between the health behavior and prevalence of chronic diseases among manufacturing workers. It would provide fundamental data in the development of health promotion programs for manufacturing workers. Methods : Data on 3,171 employees who underwent health check-ups by the National Health Insurance Service in L company, G City from March to December 2014 were analyzed. The statistical analysis of frequency, chi-square test, and multiple logistic regressions were performed using SPSS 18 program. Results : The results of this study show that obesity and over-weight are the health behaviors that influence the prevalence of chronic diseases in manufacturing employees. Conclusions : The implementation of public health projects to improve the voluntary participation of the employees can enhance their health, improve the productivity, and influence their quality of life positively by changing the health behaviors.

• Journal of Korean Neurosurgical Society
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• v.63 no.3
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• pp.279-313
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• 2020

This review summarises the classification, anatomy and embryogenesis of complex spinal cord lipomas, and describes in some detail the new technique of total lipoma resection and radical reconstruction of the affected neural placode. Its specific mission is to tackle two main issues surrounding the management of complex dysraphic lipomas : whether total resection confers better long term benefits than partial resection, and whether total resection does better than conservative treatment, i.e., no surgery, for asymptomatic lipomas. Accordingly, the 24 years progression-free survival data of the author and colleagues' series of over 350 cases of total resection are compared with historical data from multiple series (including our own) of partial resection, and total resection data specifically for asymptomatic lesions are compared with the two known series of non-surgical treatment of equivalent patients. These comparisons amply support the author's recommendation of total resection for most complex lipomas, with or without symptoms. The notable exception is the asymptomatic chaotic lipoma, whose peculiar anatomical relationship with the neural tissue defies even our aggressive surgical approach, and consequently projects worse results (admittedly of small number of cases) than for the other two lipoma subtypes of dorsal and transitional lesions. Prophylactic resection of asymptomatic chaotic lipomas is therefore not currently endorsed.

• The Korean Journal of Health Service Management
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• v.9 no.2
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• pp.47-56
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• 2015

The purpose of this study was to observe the health status of the elderly, and to investigate the correlation between their health status and quality of life. Data from the years 2010 and 2011 were used which are from the fifth edition of the 'Survey of the Korean National Health and Nutrition'. According to multiple regression analysis, perceived health status, chronic illness, stress, depression, and suicidal thoughts were important factors in quality of life. Above all, the most important factor was perceived health status (its explanatory power was 36.5%). In conclusion, perceived health status has strong effects on the quality of life in the elderly, and it is necessary to provide more extensive welfare projects to improve the quality of life in Korean elderly.

• Health Policy and Management
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• v.6 no.2
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• pp.131-148
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• 1996

This study was carried out by using questionnaires with 200 general doctors serving as the director of health subcenter in Kyongsangbuk-do Province as of January 1995. The results are summarized as follows. It was shown that the general characteristics consisted of 53 directors in the lst year(26.5%), 85 in the 2nd year(42.5%) and 62 in the 3rd year(31.0%). The percentage spent on their medical service showed that 73.0% of those directors spent more than 90% on their medical service. Based on their general service attitiude, 0% answered that the director of the health subcenter completes the given duties as the director, and 24.5% did that the director has the sense of responsibility and duty. Multiple answers concerning inconvenience and difficulties of the health subcenter director showed that less monthly salary accounted for 75.5%, no administrative power for 50.0%, insufficient medical instruments for 35.5%, insufficient budget for 30.0%, respect. In conclusion, in order for the health subcenter to meet the function as the primary medical clinic, it is required to arange the plans to inspire the public health doctors' service desire to that they can give the medical service as good as the private primary medical clinics, to convert existing concept of the public health doctors' placement in Myon administrative district into new concept in Gun by breaking from a uniform placement, and to consider an intensive placement according to the relevant projects so that preventive health activities can be planned and carried out.

• The Korean Journal of Health Service Management
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• v.8 no.1
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• pp.125-134
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• 2014

The purpose of this study was to identify influencing factors associated with infantile oral health knowledge among pregnant women. The participants were 300 pregnant women who agreed to participate in this study. The data were analyzed with descriptive statistics, t-test, ANOVA, Pearson correlation, and simultaneous multiple regression using the SPSS 21.0 ver program. Findings of the study can be summarized as follows. First, the infantile oral health knowledge of primigravida total score was $28.80{\pm}3.02$, and multigravida total score was $30.23{\pm}2.94$. Second, infantile oral health knowledge different according to education, experience of delivery, experience of oral health education and need of oral health education, Third, a positive correlation existed between need of oral health education, experience of delivery, education, and experience of oral health education. Forth, the predictors that affect the infantile oral health knowledge were experience of delivery, need of oral health education, experience of oral health education, education,. Consequently, it was necessary to encourage primigravida to take part in infantile oral health education program and oral health projects.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.8
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• pp.197-204
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• 2020

Nowadays, many construction engineering and technology enterprises are evolving to find that prosperity is driven and inspired by an open economy with dynamic markets and fierce multifaceted competition. Besides brand and product uniqueness, the ability to quickly provide customers with quotes are matters of concern. Such a requirement for prompt cost estimation of construction investment projects with the use of a construction price index poses a significant challenge to contractors. This is because the nature of the construction industry is shaped by changes in domestic and foreign economic factors, socio-financial issues, and is under the influence of various micro and macro factors. This paper presents a fuzzy decision-making approach for calculating critical factors that affect the construction price index. A qualitative approach was implemented based on in-depth interviews of experts in the construction industry in Vietnam. A synthetic comparison matrix was calculated using Buckley approach. The CoA approach was applied to defuzzified the fuzzy weights of factors that affect the construction price index. The research results show that the top five critical factors affecting the construction price index in Vietnam are (1) consumer price index, (2) gross domestic product, (3) basic interest rate, (4) foreign exchange rate, and (5) total export and import.

• Journal of the Korea Institute of Military Science and Technology
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• v.12 no.1
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• pp.70-79
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• 2009

Currently, the investment on Research and Development(R&D) for defense core technology is continuously increasing to maintain advanced country's R&D level. In accordance with this trend, the national defense R&D investment management system is being more strengthening, and importance of performance evaluation is being emphasized more and more. However, the existing indicators of performance evaluation for defense core technology R&D is limited in efficient management because of the qualitative evaluation items and subjective allocation of points. In this paper, we developed a novel indicator for defense core technology R&D performance evaluation through domestic and foreign related literature and inquiry, brainstorming, and analysis techniques by Stepwise Multiple linear Regression(SMR) and Analytic Hierarchy Process(AHP). And we verified effectiveness of proposed indicators of performance evaluation by comparing with the existing evaluation indicators. Our proposed indicators for performance evaluation will create superiority performance on defense R&D fields.

• International conference on construction engineering and project management
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• 2022.06a
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• pp.401-407
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• 2022

Central heating, ventilation and air conditioning (HVAC) is one of the largest consumers of energy in the residential sector. This project explores the use of multiple HVAC units and/or Zoning in a single residence to reduce energy loads. The energy consumption data of a detached single-family home using two HVAC units, one primary for the main house and a secondary HVAC for a casita, was collected for the same month for two consecutive years, along with details related to the outdoor temperature and the square footage being air-conditioned by each HVAC. A regression algorithm was trained using the above details to find the relation between the parameters. Next, based on the occupancy and usage patterns, the HVAC was redesigned assuming more area under the secondary HVAC unit. The trained algorithm was then used to make energy usage predictions for the revised primary HVAC area, with the assumption that the secondary HVAC unit was turned off. The results were compared with existing energy usage data. It was determined that there were significant energy savings in the second scenario. It is expected that this study and its findings will help future research projects explore more ideas as alternatives to central HVAC, in improving the economic viability of existing options, and in developing a savings calculation tool that will help consumers make informed decisions on their best alternatives to central HVAC.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.425-428
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• 2015

New technologies using a CNC machine are being developed to reduce the production cost of free-form buildings. For production of free-form members using such technologies, vast free-form buildings should be first split into multiple panels that are productible. Taking into consideration of the curved surface of free-form members, the segmented free-form panels may vary in shape and size, which may cause a lot of errors. In addition, it is time-consuming for the work. However, the current panelizing work is completed with the trials and errors of engineers and architectural designers even in large-scale projects, which results in increased construction duration and cost. Thus, it is necessary to develop a technology for panelizing free-form panels so as to maximize the economic feasibility of production technologies for free-form concrete members. The study intends to develeop automatic panelizing algorithms of free-form buildings considering the curved surface and size of free-form panels and the production conditions. The developed algorithms will be useful in applying the production technologies of free-form buildings using CNC machine and reducing the cost.