PURPOSES : This study aims to evaluate the road safety of the super-elevation transition section of a left turn curve and suggest the minimum longitudinal grade of a super-elevation transition section to be used before and after a left curved section. METHODS : We evaluated the road condition by means of the safety-criterion-evaluation method involving side friction factors, and then solve the problem by introducing the minimum longitudinal grade criterion based on conditions described in the hydraulics literature. RESULTS : It was calculated that when a road satisfies hydroplaning conditions, the difference between side friction assumed and side friction demanded is less than -0.04. In this case, the safety criterion for the condition is unsatisfied. Conversely, when a road is in a normal state under either wet or dry conditions, it was calculated that the difference between side friction assumed and side friction demanded is more than 0.01. Thus, the safety criterion for this condition is found to be satisfied. After adjusting the minimum longitudinal grade applied to a super-elevation transition section, the hydroplaning condition can be eliminated and the safety criterion can be met for all sections. CONCLUSIONS : It is suggested that a minimum longitudinal grade should be provided on super-elevation transition sections in order to prevent hydroplaning.
Seungho Kim;Jae-Min Lee;Moonyoung Choi;Sangyong Kim
Smart Structures and Systems
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제33권4호
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pp.313-323
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2024
Deterioration of buildings is one of the biggest problems in modern society, and the importance of a safety diagnosis for old buildings is increasing. Therefore, most countries have legal maintenance and safety diagnosis regulations. However, the reliability of the existing safety diagnostic processes is reduced because they involve subjective judgments in the data collection. In addition, unstructured tasks increase rework rates, which are time-consuming and not cost-effective. Therefore, This paper proposed the method that can calculate the safety grade of deterioration automatically. For this, a DNN structure is generated by using existing precision inspection data and precision safety diagnostic data, and an objective building safety grade is calculated by applying status evaluation data obtained with a UAV, a laser scanner, and reverse engineering 3D models. This automated process is applied to 20 old buildings, taking about 40% less time than needed for a safety diagnosis from the existing manual operation based on the same building area. Subsequently, this study compares the resulting value for the safety grade with the already existing value to verify the accuracy of the grade calculation process, constructing the DNN with high accuracy at about 90%. This is expected to improve the reliability of aging buildings in the future, saving money and time compared to existing technologies, improving economic efficiency.
Purpose: The purpose of this study was to develop and evaluate the effects of a safety education injury prevention program in elementary school students. Methods: To develop the safety education program, Dick & Carey's teaching model and Keller's ARCS theory were applied. A safety education programs was developed for lower grade students (1st-3rd) and for higher grade students (4th-6th). To evaluate the effect of the safety education program, a pre-post test questionnaire was used with experimental and control groups. The participants were 238 (119 in the experimental group, 119 in the control group) lower (3th) grade and 296 (148 in the experimental group, 148 in the control group) higher (5th) grade elementary school students. For students in each experimental group, safety education was provided for 40 min once a week for 10 weeks. Results: There were significant differences in the level of injury prevention knowledge, attitude, and practice between the experimental group and control group in both the lower and higher grade elementary students. Conclusion: The findings of this study indicate that safety education is an effective nursing intervention to improve injury prevention knowledge, attitude, and practice in elementary school students.
This paper surveys and researches primary school students' situation of their school life. The purpose of this paper is to propose the basic information of the accident prevention teaching and the safety management in order to avoid accidents to occur beforehand. We selected m primary students out of the six primary schools in Taebaek City at which the nursing students of Kangwon Tourism College practiced school health. We used SPSS Win for analyzing data. We carne up with the general characteristics and percentage using frequency analysis, mean and standard deviation of each item, the mean difference using T-Test, and the different factors using one-way analysis. The results are as follows: 1. The 6th grade students don't practice safety procedures than the 5th grade students during outside the school. The older the student is, the less it practices safety procedures. 2. Boys practice safety procedures better than the girls during inside and outside the school. 3. Hot -tempered students don't practice safety procedures properly. 4. Most of the students who often use the health room of the school have high scores in safety procedures test and as a result, these students practice safety procedures thoroughly. 5. The grade of safety living activity is the highest during gymnastic class. Next is when the students use the stairs when they are going up and clown. Then, the use of science room In the playground is the lowest grade of safety for living activity.
With the purpose of instilling an awareness of the safety of users of electrical equipment and inducing voluntary facility improvement through the safety rating system for general low voltage electrical equipment, simulation and field application of the safety rating of general low voltage electrical equipment were conducted. For the introduction and application of the safety rating system for general low-voltage electrical equipment, data related to domestic safety was investigated and analyzed, cases of introduction in other fields were reviewed, and for design, the 4M risk assessment method of the Korea Occupational Safety and Health Agency and the cases of safety index development in Korea were analyzed and standardized. Safety rating system simulations were conducted for general low-voltage electrical equipment, and problem improvement measures were prepared by analyzing the results through on-site verification and simulation applied to the initial design. Design standards for the introduction of the safety rating system for general low-voltage electrical equipment were prepared, and 394 youth training facilities were applied to the field to see if the design standards were practically applicable to the field. With the application of the safety rating system for low-voltage electrical equipment for general use, youth training facilities that had been classified as 'appropriate' were able to induce an upgrade to a higher level through voluntary facility improvement according to the application of grades (A to E). As a result of inducing voluntary repair projects based on the results of the 1st and 2nd inspection of youth training facilities, it was confirmed that 86 facilities received grade A, 225 facilities received grade B, and only 311 facilities received grade A to B out of a total of 394 facilities, and there was no grade E.
Sungkyun Park;Seongwon Ma;Hoekyeong Seo;Sang Gil Lee;Jihye Lee;Shinhee Ye
Annals of Occupational and Environmental Medicine
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제35권
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pp.52.1-52.13
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2023
Background: In 2019, the International Agency for Research on Cancer re-evaluated the carcinogenicity of night-shift work and reported that there is limited evidence that night-shift work is carcinogenic for the development of prostate cancer. Therefore, in 2020 and 2021, the Korean Epidemiologic Investigation Evaluation Committee concluded that 2 cases of prostate cancer were occupational diseases related to the night-shift work. Here, we report the 2 cases of prostate cancer in night-shift workers which were first concluded as occupational diseases by the Korean Epidemiologic Investigation Evaluation Committee. Case presentation: Patient A: A 61-year-old man worked as a city bus driver for approximately 17 years, from 2002 to 2019, and was exposed to night-shift work during this period. In March 2017, the patient was diagnosed with high-grade prostate cancer through core-needle biopsy after experiencing stinging pain lasting for 2 months. Patient B: A 56-year-old man worked as an electrician and an automated equipment operator in a cement manufacturing plant for 35 years from 1976 to 2013 and was exposed to night-shift work during this period. In 2013, the patient was diagnosed with high-grade prostate cancer through core needle biopsy at a university hospital because of dysuria that lasted for 6 months. Conclusions: The 2 workers were diagnosed with high-grade prostate cancer after working night shifts for 17 and 35 years respectively. Additionally, previous studies have reported that high-grade prostate cancer has a stronger relationship with night-shift work than low or medium-grade prostate cancer. Therefore, the Korean Epidemiologic Investigation Evaluation Committee concluded that night-shift work in these 2 patients contributed to the development of their prostate cancer.
In Korea, about 60 percent of railroad accidents are associated with highway-rail grade crossings numbering 1,657 nationwide, which the railroad system operates. To reduce the number of accidents, the authority formulated methods to improve or eliminate grade crossings. However, the improvement programs have made progress in slow time due to the institute inertia and the lack of funds from the municipal government, which shares the cost of improvement of grade crossings. Thus, this study analyses the institute system of the grade crossings, proposes modifications, and suggests financing methods to improve the grade crossings and to lower the number of accidents. Presently, the grade crossings safety perspective is directed towards road conditions and so a new perspective, which includes safety from the train perspective and to finance in review of railway system and to allocate the cost between the central government and the municipal governments. is discussed.
Public institutions have a responsibility to ensure the safety of their employees and the public. One way to do this is to implement a systematic safety inspection system based on risk assessments and continuous improvements. This study developed a systematic safety inspection system for public institutions that are ordered construction projects. The proposed system in this study consists of a three-step process: (1) developing safety grade evaluation tables, (2) preparing and conducting safety inspections, and (3) evaluating and improving safety management grades. The first step is to develop safety grade evaluation tables by analysis and diagnosis of the construction site's work type, disaster statistics, and related laws. The second step is to conduct safety inspections using the developed evaluation tables. The third step is to determine the safety management grade based on the results of the safety inspection, and to improve risk factors found during the safety evaluation. The proposed system was implemented in highway construction projects carried out by public institutions. The results showed that the proposed system has two major effects: (1) reducing accident-related deaths and injuries, (2) improving safety management levels by continuous evaluation and improvement. The proposed system can be utilized in construction projects ordered by public institutions to improve the level of occupational safety and health.
Purpose: The purpose of this study was to measure the effects of a school safety education program based on the PRECEDE-PROCEED model for upper grade elementary students. Methods: One hundred ten 6th-grade students sampled from an elementary school in D City were divided into the education group (n=55) and the non-education group (n=55). School safety education was provided to the education group for 8 weeks and a questionnaire survey about safety knowledge, safety practice and the frequency of safety negligence was carried out before and after the education from March 2 to July 13, 2010. Results: After the application of the safety education program, the education group got a higher safety knowledge score than the non-education group (p<.001). Both the education and non-education groups showed a significantly increased safety practice score (p<.01). In the comparison of safety negligence, the education group showed lower frequency (p<.01). In addition, according to the results of ANCOVA and t-test, the school safety education program influenced safety knowledge significantly (p<.001). Conclusion: This result shows that a school safety education program based on PRECEDE- PROCEED can improve safety knowledge. Further studies will be required to develop continuous and systematic safety education programs.
The purpose of this study was supply basic information and positive attitude needed to understand the disabled person through the analysing EMT Dept. student reaction on the disabled person. The subjects for this study were 251 students from G-college in In-Cheon City. The subjects were separated as the EMT dept. students and general dept student. The instrument used for this study were Lazer. Bonett and Granaff(1973). The scale of attitude on the disabled person. Data were analyzed by use of two-sample t-test and correlation coefficient with SAS program. Results are as follows ; 1. Frist, the EMT Dept. students showed more positive and optimistic attitude on the disabled person as safety prevention with their family life and safety prevention with first impression, but the general dept. student showed more positive and optimistic attitude on the disabled person as safety prevention with their self-consciousness, safety prevention with operative capacity, safety prevention with social life and safety prevention with school life. 2. Second, on attitude of 1 or 2 grade, first grade showed more positive and optimistic attitude on the disabled person as safety prevention with self-consciousness and safety prevention with operative capacity. Second grade showed more positive and optimistic attitude on the disabled person as safety prevention with social life, safety prevention with family life and safety prevention with school life. and first impression. But disabled person as safety prevention with self-consciousness, safety prevention with operative capacity, safety prevention with social life, safety prevention with school life and first impression. 3. Third, in interrelation effect analysing each section department and grade. They showed and interrelated more positive and optimistic attitude on the disabled person as safety prevention with their social life and first impression. As a results, it is important to understand disabled person whose physical condition. Especially, this study suggests to need to endeavor safety prevention for disabled person.
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