• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.869-875
• /
• 2009

Safety is a big issue in the construction sites. For safe and secure management, tracking locations of construction resources such as labors, materials, machineries, vehicles and so on is important. The materials, machineries and vehicles could be controlled by computer, whereas the movement of labors does not have fixed pattern. So, the location and movement of labors need to be monitored continuously for safety. In general, Global Positioning System(GPS) is an opt solution to obtain the location information in outside environments. But it cannot be used for indoor locations as it requires a clear Line-Of-Sight(LOS) to satellites Therefore, indoor location monitoring system could be a convenient alternative for environments such as tunnel and indoor building construction sites. This paper presents a case study to investigate feasibility of Wi-Fi based indoor location monitoring system in construction site. The system is developed by using fingerprint map of gathering Received Signal Strength Indication(RSSI) from each Access Point(AP). The signal information is gathered by Radio Frequency Identification (RFID) tags, which are attached on a helmet of labors to track their locations, and is sent to server computer. Experiments were conducted in a shield tunnel construction site at Guangzhou, China. This study consists of three phases as follows: First, we have a tracking test in entrance area of tunnel construction site. This experiment was performed to find the effective geometry of APs installation. The geometry of APs installation was changed for finding effective locations, and the experiment was performed using one and more tags. Second, APs were separated into two groups, and they were connected with LAN cable in tunnel construction site. The purpose of this experiment was to check the validity of group separating strategy. One group was installed around the entrance and the other one was installed inside the tunnel. Finally, we installed the system inner area of tunnel, boring machine area, and checked the performance with varying conditions (the presence of obstacles such as train, worker, and so on). Accuracy of this study was calculated from the data, which was collected at some known points. Experimental results showed that WiFi-based indoor location system has a level of accuracy of a few meters in tunnel construction site. From the results, it is inferred that the location tracking system can track the approximate location of labors in the construction site. It is able to alert the labors when they are closer to dangerous zones like poisonous region or cave-in..

• 건축역사연구
• /
• 제25권5호
• /
• pp.27-40
• /
• 2016

The purpose of this study was to comprehend the procurement system of iron materials and the production process of ironwork in royal tombs constructions in the later Joseon period. For this purpose, sixteen Sanneung-uigwes were analyzed. The following conclusions have been reached through the study. First, it was procuring five types of iron materials in constructions of royal tombs. Sincheol had been supplied up to the mid-18th century. On the other hand, the amount of jeongcheol was increased rapidly. Because of the procurement system of initial tools was changed from bokjeong(a kind of tribute) to self-production in the Noyaso. Second, the government stockpiles were utilized as much as possible than bokjeong to manage the limited construction period and sudden construction start. Third, before moving the site of tombs, the melting furnace was installed in the Gungisi(armament factory). The amount of the melting furnace was increased from 5 to 8 since producing the initial tools in the Noyaso. Fourth, six kinds of master artisans were worked in the field of producing ironwork. Metal worker was assigned to one person per melting furnace. Fifth, the quality of final iron materials was controlled by use. Since the 19th century, it had been produced enhanced ironwork.

• 한국지하수토양환경학회:학술대회논문집
• /
• 한국지하수토양환경학회 2005년도 INTERNATIONAL SYMPOSIUM ON SOIL & GROUNDWATER ENVIRONMENT
• /
• pp.5-21
• /
• 2005

Urbanization rates of population range from about 1% in the developed countries to about 4% in developing countries. For a global population that may reach 10 billion within the next 40 years, pressure has arisen for an increase in the large-scale use of wastes and byproducts in construction. Ironically, most of the wastes that need to be recycled are generated in large cities where the need for constructed facilities to serve large population is high. Waste and recycled materials (WRM) that are used in construction are required to satisfy material strength, durability and contaminant teachability requirements. These materials exhibit a wide variety of characteristics owing to the diversity of industrial processes through which they are produced. Several laboratory-based investigations have been conducted to assess the pollution potential and load bearing capacity of materials such as petroleum-contaminated soils, coal combustion ash, flue-gas desulphurization gypsum and foundry sand. For full-scale systems, although environmental pollution potential and structural integrity of constructed facilities that incorporate WRM are interrelated, comprehensive schemes have not been developed for integrated assessment of the relevant field-scale performance factors. In this presentation, a framework for such an assessment is proposed and presented in the form of a flowchart. The proposed scheme enables economic, environmental, worker safety and engineering factors to be addressed in a number of sequential steps. Quantitative methods and test protocols that have been developed can be incorporated into the proposed scheme for assessing the feasibility of using WRM as partial or full substitutes for earthen highway materials in the field.

• 한국안전학회지
• /
• 제27권5호
• /
• pp.95-98
• /
• 2012

There are many high-rise apartment building construction in Korea. There was an accident to pass through worker head by rebar dropped from height place. Therefore, low cost-high effectiveness method to prevent this type of accident should be revised and applied into the construction site. This study is to find out which method could be effectively applied to a site with low cost. Practical field test at 4th floor, 10th floor of apartment building site using re-bar diameter D10, D13, D16, D19, D22 with a length of 1 m, 1.5 m, 2 m, 2.5 m, 3 m which are common by used in a site. The test has also been done with a cover of styrofoam thickness 4.5 cm and thickness 9cm on field drop preventing net. One sheet of styrofoam thickness 45 mm has approximately two times stronger than only prevention net, It is found. Also, Two sheets have approximately two times stronger than one sheet of it.

• 한국안전학회지
• /
• 제32권2호
• /
• pp.21-26
• /
• 2017

According to the data of Korea Occupational Safety and Health Agency, electric shock accidents during recent 11 years exceeded more than 60% in architecture/other and construction work, the countermeasures for safety are required in the harsh environment of a construction site where moving electric machines and equipments are widely used. The establishment of countermeasure for insulation degradation and defect is required, in consideration of increasing trend for accidents caused by defective insulation among low voltage electrical installation each year. The aim of this study is to propose the policy about portable electrical tool standards and/or worker's safety standards for preventing electric shock accidents on safety workings, and is to develop the technology and the safety device to prevent electric shock for accident prevention reduction through experiments. It obtained the followings through this study; statistical data analysis of late about 10 years of electric shock-related industrial accidents analysis and portable electric tools; safety device development of 'device for testing continuous grounding and power shut-down' to prevent electric shock from portable electric tools. Furthermore, developed results and proposal in this study will help to prevent the electric shock accidents from portable electric tools and will be expected the utilization of policy formulation, educational data and field supplement of the safety device, and etc.

• 한국안전학회지
• /
• 제22권3호
• /
• pp.81-87
• /
• 2007

In this study digital human models of ship construction tasks using modeling & simulation were constructed and human models' activities through human activity analysis were evaluated. Human Factors experts analyzed the actual workers' tasks using the same technique used in human activity analysis at the same time. The main objective of this study is to check a possibility of applying digital human modeling technique to ship construction tasks that are mostly non-standardized(not uniformed) whereas most applications of digital human modeling technique have been applied to standardized tasks. We evaluated postures of both real workers and digital humans by RULA. It turned out that the final scores of RULA evaluation on real workers are the same as the RULA scores for digital humans. However, there were differences of RULA detail scores between real workers and digital humans in the several processes related with the wrist twist and deviations. Those differences are considered to be resulted from the error in the on-site measuring worker's body dimension which could be reduced by accurate tools to correct data for body dimension and digital real drawings for facilities. The results showed possibility of application of digital human modeling and ergonomic analysis on informal work operations as well as formal operations in the shipbuilding industry.

• 문화기술의 융합
• /
• 제5권4호
• /
• pp.349-354
• /
• 2019

건설현장에서 추락으로 인해 사망하는 근로자는 전체 사망자의 약 40%를 차지하며 사망사고 주요 발생 형태로 나타나고 있다, 또한 우리나라 인구구성이 점차 고령화됨에 따라 건설현장에서도 고령화 비율이 점점 높아지고 있으며 신체기능 저하 인지능력 저하 등에 따른 추락재해가 점점 증가추세에 있다. 이에 따라 고령 근로자 추락에 미치는 요인에 대하여 설문조사를 실시하였으며 재해 당사자인 고령 근로자에 초점을 맞춰 보다 근본적인 추락 예방대책을 제시하고자 한다.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2019년도 추계 학술논문 발표대회
• /
• pp.62-63
• /
• 2019

Currently, polymer-based tile cement (Thin-bed method) and epoxy adhesive (Thick-bed method) are mainly used as tile adhesive for polishing and porcelain. In the case of epoxy adhesive, there is a low economic efficiency, there is a problem that the work efficiency is reduced by mixing the resin and the hardener. In particular, the epoxy contains a bisphenol A and amine component, there is a risk of workable disease when a worker is exposed to odor and harmful gases generated in the epoxy adhesive for a long time. Against this background, it is necessary to analyze the hazards of using epoxy adhesives indoors, and develop cementitious high performance tile adhesive products with significantly lower hazards than epoxy adhesives.

• 한국건설안전학회 논문집
• /
• 제1권1호
• /
• pp.22-30
• /
• 2018

건설안전 강화를 위한 노력에도 불구하고 국내 건설현장의 안전사고는 계속 증가하고 있다. 시인성 높은 색채를 사용한 안전표지는 근로자가 다른 주의집중 상태로 인해 위험을 인지하지 못할 때, 즉각적으로 장기기억에 내재된 정보를 불러일으킴으로써 건설사고 예방에 기여할 수 있다. 이러한 건설안전표지가 건설현장에서 효과적이고 국제적인 의사소통수단으로 기능하기 위해서는 안전표지색채에 대한 명확하고 통일된 기준과 더불어 건설현장이 갖는 특성을 적절히 반영하는 것이 필요하다. 본 연구는 한국, 미국, 영국 및 호주의 4개국의 건설안전표지 색채기준을 분석하고, 건설산업의 특성을 고려한 안전표지 색채기준 개선방안을 제안하였다. 4개국 모두 파란색을 안전색상으로 지정하고 있는데, 오늘날 건설산업에 많은 고령 근로자가 종사하는 것을 고려한다면, 고령 근로자에게 있어 구분이 어려운 푸른색 계열의 안전표지사용은 부적절하다. 또한, 건설현장은 장소에 따라 밝기가 상이할 뿐만 아니라 야간이나 지하 작업의 경우 충분한 밝기 확보가 어려우므로, 시공간의 변화에 따른 빛 조건을 보정하기 위한 허용오차나 색상 팔레트가 필요하다.

• 한국의류산업학회지
• /
• 제8권2호
• /
• pp.203-208
• /
• 2006

The purpose of this study is to examine the ergonomic working uniform. Developing a prototype uniform will be the first stage in aiming to create a working uniform in the construction field. This study was conducted using a questionnaire in the construction field of Daegu city, and the data was gathered from 121 questionnaires. Some of the questions that were asked, were about the case of putting on and removing the uniform and if any areas of uniform caused discomfort. The areas of the uniform that caused problems were the waist, knee, shoulder, arm and neck regions. The free range of movement of these regions were restricted and caused the person to feel cramped. The results of the questionnaire called for improvements to the knee, waist, shoulder and crotch area. The prototype that was developed offered more range of movement in the knee and crotch area, while not causing the uniform to be cramped too much during motion. The prototype also improved comfort by raising the waist line of back part, and by having the ability of the uniform to be tightened or loosened with zipper according to the persons preference. The upper area of the uniform was improved by dropping the shoulder seam line which enhanced comfort and also allowed a better fit for the elbow and wrist. The prototypes additional feature included a slit zipper in the sides of the trousers and a gusset in the under arm area to improve breathability and sweat elimination.