• Smart Structures and Systems
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• v.13 no.6
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• pp.993-1014
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• 2014

In civil engineering, revolving structures (RS) are a unique structural form applied in innovative architecture design. Such structures are able to revolve around themselves or along a certain track. However, few studies are dedicated to safety design or health monitoring of RS. In this paper, a wireless dynamic sensing system is developed for RS, and field tests toward a large revolving auditorium are conducted accordingly. At first, a wheel-rail problem is proposed: The internal force redistributes in RS, which is due to wheel-rail irregularity. Then the development of the sensing system for RS is presented. It includes system architecture, network organization, vibrating wire sensor (VWS) nodes and online remote control. To keep the sensor network identifiable during revolving, the addresses of sensor nodes are reassigned dynamically when RS position changes. At last, the system is mounted on a huge outdoor revolving auditorium. Considering the influence of the proposed problem, the RS of the auditorium has been designed conservatively. Two field tests are conducted via the sensing system. In the first test, 2000 people are invited to act as the live load. During the revolving process, data is collected from RS in three different load cases. The other test is the online monitoring for the auditorium during the official performances. In the end, the field-testing result verifies the existence of the wheel-rail problem. The result also indicates the dynamic sensing system is applicable and durable even while RS is rotating.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.4
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• pp.384-391
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• 2020

An annual average of more than 100 casualties occur on construction sites designated by the occupational safety and health law despite the safety assessment regulations from Korea Occupational Safety & Health Agency. Even if those sites involve more harmful or hazardous work than other sites, the result creates doubt regarding the effectiveness of the safety assessment regulations. The safety of construction sites is difficult to maintain continuously and instantly because ofthe variability in the construction industry despite inspecting workers, equipment, and facilities by managers. Many discussions on how to utilize BIM have been made to improve the productivity of construction projects, and BIM-based modeling and simulation would bring many benefits to safety. This study examined the hindrance factors of field utilization of the safety assessment regulations through a research literature survey, disaster situation analysis and questionnaire, and suggests the necessity of the application of BIM that enhances the effectiveness of safety assessment regulations by identifying the relationship between the hindrance factors and the function of BIM.

• Journal of Environmental Science International
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• v.29 no.4
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• pp.361-369
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• 2020

With the increasing role of environmental design in promoting urban safety, new design attempts have been made to improve pedestrian safety in crosswalks. This study proposes an evidence-based design solution for improving crosswalk function by conducting simulations and field experiments. Drivers with more than one-year driving experience participated in this study. Four different crosswalk design patterns were prepared: (1) a zebra pattern, (2) zebra pattern with colored triangles, (3) 3D pattern, and (4) art pattern with unique colors and design. The results supported that the zebra pattern with colored triangles could be the most effective solution for crosswalk design by increasing visibility, attention, deceleration, and landscape aesthetics. This study provided objective data to support the performance of various crosswalk patterns and suggested the need to reevaluate the present crosswalk design guidelines.

• International Journal of Railway
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• v.3 no.3
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• pp.90-94
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• 2010

In this paper, driving functions of the Korea High-speed Trains were decomposed based on systems engineering architecture. In order to analyze the driving function, various systems engineering tools and methods were used. Moreover, interfaces of decomposed driving functions were analyzed to figure out purposes of the driving functions. Through activity modeling of driving function of the Korea High-Speed Trains, main functions were derived when starting, speeding and stopping. When the high speed train is speeding, pre-departure checks and wheel slide prevention are essential driving activities for the safety and when the high speed train runs high speed, maintaining driving stability by monitoring bogie hunting and monitoring drivers' safe operation by vigilance systems is important. Furthermore, when the train is braking, the driver should checks brake and suspensions as safety actions.

• International conference on construction engineering and project management
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• 2015.10a
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• pp.179-182
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• 2015

Detecting and assessing human-related risks is critical to improve the on-site safety condition and reduce the loss in lives, time and budget for construction industry. Recent research in neural science and psychology suggest inattentional blindness that caused by overload in working memory is the major cause of unexpected human related accidents. Due to the limitation of human mental workload, laborers are vulnerable to unexpected hazards while focusing on complicated and dangerous construction tasks. Therefore, detecting the risk perception abilities of workers could help to identify vulnerable individuals and reduce unexpected injuries. However, there are no available measurement approaches or devices capable of monitoring construction workers' mental conditions. The research proposed in this paper aims to develop such a measurement framework to evaluate hazards through monitoring electroencephalogram of labors. The research team developed a wearable safety monitoring helmet, which can collect the brain waves of users for analysis. A bispectrum approach has been developed in this paper to enrich the data source and improve accuracy.

• Journal of The Korea Institute of Healthcare Architecture
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• v.26 no.2
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• pp.19-30
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• 2020

Purpose: The ratio of the visually impaired is gradually increasing due to various causes such as natural aging, accidents, and environmental changes. Therefore, this study has two folds. Firstly, it aims to analyze the current satisfaction level with information facilities for the visually impaired. Secondly, it aims to examine the factors affecting the satisfaction with indoor information facilities. Through this study, it helps to identify problems of information facilities for the visually impaired and it works as a practical data for further improvements. Methods: For 50 visually impaired people, a telephone survey was conducted on the satisfaction with the braille blocks, braille signboards, braille information boards with tactile map, audio guide devices, and safety egress devices. Microsoft Excel and SPSS 26.0 were used for the analysis. Results: It was confirmed that the overall satisfaction with the indoor information facilities was very low. The more the visually impaired people recognized the installation standards, and the better the maintenance was, the higher the satisfaction. In the case of braille blocks and braille signboards, the effect of information transfer on satisfaction was relatively high. In the case of audio guide device and safety egress device, the standard suitability influenced satisfaction. Implications: The low level of satisfaction with the overall information facilities can impede visually impaired people from receiving practical help through the information facilities. Factors influencing the satisfaction level of each facility were identified, which makes it possible to prepare effective improvement measures.

• Journal of the Korean Institute of Landscape Architecture
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• v.30 no.3
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• pp.35-45
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• 2002

This research is related to the evaluation of rural amenities. Since the UR negotiations, the wave of market liberalization has brought many difficulties to the rural areas. This paper serves to identify a number of important elements such as socialization, cultural and ecological resources and investigate the viability of rural areas. The purpose of this study is to evaluate rural amenities by evaluation indices and establish planning direction of amenities for rural areas. The data have been collected by methods of a field survey and a questionnaire survey. The evaluation indices have been defined as socialization, safety, amenity and convenience by several researches. Villages have been divided into two groups. Seven(Shimchon, Ibaek, Muan, Dokpyong-li, Imchin-li Hyangyang-li, Wonwol-li) have been newly constructed, six(baeksa, Mokmyon, yongho-li, shindyae-li, hwangdun·songgae) have been redeveloped. There are considerable differences in the degree of satisfaction between he two groups. The results are as follows: 1) socialization is very necessary for amenities in rural villages. Especially the values of the resident's interactions and management of the village are most important in the preparation of an amenity plan in rural areas. So the plans and establishment of public facilities are requisite for the residents community. 2) The convenience of rural public facility plans is necessary for the improvement of the farmers'living conditions. For planning the rural villages, special regards are paid to characteristics of the village, such as the former place of residence and occupations. 3) Newly constructed village should improve their socialization and the redeveloped types should try to get a better life for amenity and safety, The residents of the redeveloped types show relatively high degree of satisfaction with indices of resident community, living convenience facilities, and management of village. On the contrary, amenity and safety are good in newly constructed types. This study has taken into consideration the characteristics of rural villages. It makes a contribution to the redevelopment of rural villages and improves amenities in rural villages. It is recommended that more studies classify the resources of rural areas and measure amenities which are significant to city dwellers in the future.

• Journal of the Korean Institute of Landscape Architecture
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• v.50 no.2
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• pp.89-101
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• 2022

The study was conducted in Erhe Park, a neighborhood park in Dali City, China, to derive the influence of environmental factors in the park on the elderly's satisfaction and to analyze the satisfaction in order to provide improvement recommendations. First, the evaluation indicators were selected, by referencing previous research into the elderly's evaluation of external spatial environments and the influence of various factors was determined from the questionnaire and factor analysis. Second, a fuzzy comprehensive evaluation was conducted to understand the satisfaction of the elderly, and then an Importance-Performance Analysis(IPA) analysis was conducted to develop improvement recommendations. Results of the factor analysis showed that park's environmental factors were grouped into four categories: facility suitability and comfort, safety and convenience of use, natural environment comfort, and parkway convenience. Based on this, the overall satisfaction rating for the environmental factors in Erhe Park was between satisfactory and average. The natural environment comfort was rated satisfactory, the facility suitability and comfort, and convenience and safety were rated average, and parkway convenience was rated near to satisfaction. The IPA analysis revealed that the suitability of rest facilities, suitability of convenience facilities, facility management status, safety of entrances and exits, and nighttime lighting facilities were items of high importance but low satisfaction that needed to be improved. The results of this study can be utilized as a guide for future building or readjustment of senior-friendly parks, and they are critical for increasing senior-friendly park satisfaction.

• Journal of the Institute of Convergence Signal Processing
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• v.23 no.1
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• pp.28-36
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• 2022

Currently, the automation and intelligence of the shipbuilding industry have improved its work production capacity and cost competitiveness, but the reduction rate of safety accidents among industrial site workers is still low and the damage caused by safety accidents is very serious, so there is a need for improvement according to the workplace. This research aims to demonstrate the connectivity between smart safety helmets in the demonstration area to verify the effectiveness along with the development of smart helmets for worker protection and environmental safety in shipyards. For efficient communication between workers, impact noise of over 95dB was confirmed in the workplace, and noise reduction was required. To solve this problem, the filtering performance was compared and analyzed using the Butterworth, Chebyshev, and elliptic algorithms. The connectivity test and noise reduction method between smart helmets proposed in this study will increase the usability and safety of the field through the development of advanced smart helmets tailored to the shipbuilding workplace in the future.

• Journal of the Korean Society of Marine Environment & Safety
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• v.24 no.5
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• pp.604-610
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• 2018

Recently, due to the rapid growth of the leisure industry, demand for small-scale flotation and mooring pontoon platforms has been increasing rapidly. Standard rules for the design and structural safety of such structures have become necessary. This paper provides criteria that can be referenced when designing pontoon platforms, and also introduces structural safety evaluation procedures. In this study, the structural safety and stability of a 15-meter pontoon platform were investigated through structural design and finite element analysis. For platforms of less than 10 meters in length, a simple structural calculation can be used, but for platforms over 10 meters, a detailed structural strength review must be considered to meet safety guidelines defined in existing regulations. The structural strength of the initial design was examined and its structural safety was verified. For future research, it is an evaluative system was developed that can be used to examine the various loading conditions during design.