• Journal of Ocean Engineering and Technology
• /
• v.12 no.1
• /
• pp.3-9
• /
• 1998

According to the developement of cities, electric wires and commuinication lines which are currently above the ground effect on the bad. Nowadays, it is necessary to build up underground facilities because the construction is increasing. Excavation work has been dominant even though the inconvenient things occurred, for example a civil appeal, a traffic obstacle, safety and spoiling the fine view because of the cost or period of the construction work. But the congestion of cities are more and more serious. Therefore shield-method is the way to escape from congestion. I considered all the construction fields which are in progress or finished.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2015.11a
• /
• pp.68-69
• /
• 2015

Traditional External Insulation Finishing System(EIFS) is applied to apartment construction by performing structural framework and insulation finishing work sequentially. Separate execution of the three works increases construction cost and duration. Concurrent construction method of EIFS, which performs framework and insulation finishing work simultaneously, is introduced in order to solve these problems. However, the introduced method is exposed to the risk of construction delay caused by bottlenecks due to interacting processes and resources. Therefore, this paper presents a simulation model suitable for estimating work productivity of the concurrent construction by considering predecessor and successor processes to optimize resource allocation and minimize construction delay.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• autumn
• /
• pp.389-392
• /
• 2002

Local Mechanical work is researched which spending unnecessary labors and time due to unnecessary material accumulation and fabricated on site. Accordingly, this study analyzes the work process of mechanical equipments by Lean Production principles. Value Stream Analysis(VSA) uncovers waste factor of the existing method and manufactory production method using Value Stream Mapping(VSM). In the results, this study presents improvement of the existing method problems and negative factors of manufactory production.

• Journal of the Ergonomics Society of Korea
• /
• v.29 no.4
• /
• pp.435-444
• /
• 2010

To identify and evaluate the risk factors in WMSD work, a number of ergonomic workload evaluation methods have been developed. In the legal examination of WMSD risk factors, simple observational workload evaluation methods are widely used instead of using costly measurement equipments such as EMG and motion analyzer. The simple workload evaluation methods can be categorized into three groups; risk factor checklist methods, posture observation methods, and manual material handling task evaluation methods. In terms of the categories, this survey summarized several representative workload evaluation methods and compared them each other. Then some industrial application cases referring each the workload evaluation methods were surveyed. Due to the characteristics of each method, the selection and application procedure of workload evaluation method should be appropriate for the corresponding work. Therefore, some guidelines for the selection and application procedure of workload evaluation method were suggested.

• Journal of the Korean Society for Precision Engineering
• /
• v.19 no.7
• /
• pp.59-64
• /
• 2002

Laser lithography technique is useful for fabricating micro-patterns of silicon wafers. In this work, the laser lithography micromachining technique is optimized based on Taguchi method. Sensitivity analysis was performed using laser scanning speed, laser power level, developing time and mixture ratio between developer and Di-water as the parameters. The results show that for the photoresist used in this work, 70${\mu}m$/s scan speed, 50㎽ laser power, 60sec. developing time and 6: 1 mixture ratio gives the best result. This work shows the effectiveness of laser lithography technique in fabricating patterns with a flew micrometer in width.

• Journal of the Korean housing association
• /
• v.8 no.3
• /
• pp.231-236
• /
• 1997

After 1970 Years. Korea has developed a concept of public domestic housing. But this house is reached the uppermost limit time of using the occupant's satisfying life. Then reconstruction of Apartment house is urgently needed which is developed in Korea. So this study is examined the demolition work on current reconstructing apartment site. for reconstruction. Therefore this research examined the fitted demolition time of low-rise house and characteristics of demolition works. The conclusions from this experiment are shown below. 1. The average day work in clutcher method is shown about 1, 032㎥/Day. 2. The calculations of the term of construction which is produced by the analysis of demolition construction period on low-rise house is below. D(day) ＝ S(day) ＋ (0.272＋0.000902b(㎥))＋R(day)

• Journal of Mechanical Science and Technology
• /
• v.18 no.12
• /
• pp.2174-2181
• /
• 2004

The metal processing system usually consists of various components such as motors, work rolls, backup rolls, idle rolls, sensors, etc. Even a simple fault in a single component in the system may cause a serious damage on the final product. It is, therefore, necessary to diagnose the faults of the components to detect and prevent a system failure. Especially, the defects in a work roll are critical to the quality of strip. In this study, a new 3-D diagnosis method was developed for roll shape defects in rolling processes. The new method was induced from analyzing the rolling mechanism by using a rolling force model, a tension model, the Hitchcock's equation, and measurement of the strip thickness, etc. Computer simulation shows that the proposed method is very useful in the diagnosis of the 3-D roll shape.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2002.05a
• /
• pp.66-69
• /
• 2002

In the ideal forming theory(1), which has been deviously developed as a direct method for optimizing forming process, material elements are required to deform following the minimum plastic work path (or the proportional true strain path). Besides the general theory(2,3), specific ideal forming theories have been developed for membrane sheet forming(4) as well as two-dimensional steady bulk forming(5-7). In this work, the ideal forming theory was successfully applied for non-steady bulk forming under the plane strain condition. Here, the shape change complying with the minimum plastic work path, was effectively described by developing a numerical code based on the characteristic method. Numerical results obtained for a specific industrial part also include the optimum pre-forming shape and its evolving shape change to the final shape as well as the boundary traction history.

• Journal of the Korean housing association
• /
• v.9 no.2
• /
• pp.67-78
• /
• 1998

Construction equipment noise has caused much annoyance for a number of dwellers in nearby construction field and it has become a very serious issue in our living environment. Therefore, in our country, a practical solution and a better method of reducing construction equipment noise are highly required in construction field. Practical solutions for the construction equipment noise, however, are very difficult to obtain, because of the lack of basic data and insufficient research works. Especially, in order to establish a successful sound isolation plan for piling work noise, which has high sound pressure level, the characteristics of the impact noise should be closely monitored and analyzed. This study attempts to survey the characteristics of attenuation and propagation of construction equipment noise in piling work by SIP(soilcement injected precast pile) method. In addition, this study intends to get the basic data to establish a standard about construction noise.

• Journal of the Korean housing association
• /
• v.17 no.6
• /
• pp.55-63
• /
• 2006

The purpose of this study is to investigate the change of kitchen in a single detached house in Jeonju city after 70's. Oral life history method which has 12 women's personal narratives and 17 women's personal narratives with written reports was used as a research method of this study. The results of the study were obtained as follows: 1) It was beginning about late 1970 year that heating system and cooking place were separated in a house. 2) Many kitchens were reconstructed for indoor stand-up work place from late 1970's to the early 1980's. 3) There were major factors such as heating system, cooking fuel, and work center in the change of kitchen in old houses. 4) The kitchen toward the center with a living room was appeared in the floor plan of modem house after 1990's. The symbolic words of the indoor kitchen that work for women were 'warmness' and 'convenience'.