• Title/Summary/Keyword: evaluation of school environment

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A Study on Artificial Intelligence Models for Predicting the Causes of Chemical Accidents Using Chemical Accident Status and Case Data (화학물질 사고 현황 및 사례 데이터를 이용한 인공지능 사고 원인 예측 모델에 관한 연구)

  • KyungHyun Lee;RackJune Baek;Hyeseong Jung;WooSu Kim;HeeJeong Choi
    • The Journal of the Convergence on Culture Technology
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    • v.10 no.5
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    • pp.725-733
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    • 2024
  • This study aims to develop an artificial intelligence-based model for predicting the causes of chemical accidents, utilizing data on 865 chemical accident situations and cases provided by the Chemical Safety Agency under the Ministry of Environment from January 2014 to January 2024. The research involved training the data using six artificial intelligence models and compared evaluation metrics such as accuracy, precision, recall, and F1 score. Based on 356 chemical accident cases from 2020 to 2024, additional training data sets were applied using chemical accident cause investigations and similar accident prevention measures suggested by the Chemical Safety Agency from 2021 to 2022. Through this process, the Multi-Layer Perceptron (MLP) model showed an accuracy of 0.6590 and a precision of 0.6821. the Multi-Layer Perceptron (MLP) model showed an accuracy of 0.6590 and a precision of 0.6821. The Logistic Regression model improved its accuracy from 0.6647 to 0.7778 and its precision from 0.6790 to 0.7992, confirming that the Logistic Regression model is the most effective for predicting the causes of chemical accidents.

Results-focused Organizational Atmosphere and Unethical Behaviors (결과집중적인 조직 분위기과 비윤리적인 행동에 관한 연구)

  • Jun, Gyung-Ju
    • Management & Information Systems Review
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    • v.38 no.3
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    • pp.127-136
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    • 2019
  • With frequent incidents of unethical practices and acts in organizations, organizational leaders need to understand some of the causes that facilitate such negative organizational behaviors to lessen the chances of unethical behaviors from occurring. In an effort to understand some of the causes of unethical behavior, this study looks at competitive atmosphere and results-focused performance evaluation as some of the influencing factors on employees' tendency to decide to behave unethically. Competition culture can spur unethical behavior and evaluation culture with emphasis on results-focused which can create a perception among employees of a narrow view of work and how it is defined. The argument of this paper is that such characteristics can create environment for unethical behaviors and serve as an added push upon employees to choose to behave unethically. Collection of survey results from those working in Busan area were used to test the hypotheses using regression. Data analysis showed that in organizational atmosphere that is overly competitive and results-focused can influence employees to behave unethically. Implications and future research suggestions are discussed in conclusions.

A Study on the Habitat Suitability Index (HSI) of 'Hynobius leechii' in Central Forest Area, Korea (중부 산림지역 내 도롱뇽 서식지 적합성 지수(HSI)에 관한 연구)

  • Ko, Kyu Young;Koo, Bon Hak
    • Journal of Wetlands Research
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    • v.24 no.4
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    • pp.213-223
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    • 2022
  • This study was conducted to establish a Habitat Suitability index (HSI) based on literature research and field surveys on ecology and habitat of 'Hynobius leechii'. And this study will be used as basic data for qualitative evaluation of habitat environment. The survey sites were divided into natural habitats close to the prototype habitat and artificial restoration areas where Hynobius leechii was monitored. So the types of habitats were diversified. Hynobius leechii is a vulnerable species to climate change because it is affected by the microhabitat and has low mobility. HSI variables of Hynobius leechii were extracted through domestic and overseas literature, and standards were extracted from literature research and field survey. The standards were presented as a value of the physical allowable category in consideration of realization. To verify the study, an in-depth consultation was conducted by amphibians experts. HSI variables of Hynobius leechii were included 9 variables such as Overstory canopy cover(%), Understory cover(%), Water-pH, Soil-pH, Soil relative humidity(%), Leaf litter depth(cm), Rock substrates (%), Type of Coarse woody, Distance from Street or Pollutant(m).

Development and Application of an Evaluation Method for a Freight Vehicle Route Management System (화물자동차 통행관리제도의 평가방법 개발 및 적용 (서울지역을 대상으로))

  • Kim, Yu-Chan;Park, Dong-Joo
    • Journal of Korean Society of Transportation
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    • v.26 no.4
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    • pp.17-28
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    • 2008
  • Favorable policies for freight vehicles (i.e., trucks), such as exclusive "Truck-ways," have been proposed, and at the same time restricted policies for freight vehicles have been suggested because transportation of goods by truck aggravates traffic congestion and environmental conditions in urban areas. This study discusses the limitations of assessment processes for freight vehicle route management systems which have been carried out from limited perspectives such as physical distribution efficiency and traffic circulation. The objective of this study is to propose an assessment method of truck route management systems in urban areas which includes more varied criteria. This research modified the two existing assessment indices of physical distribution efficiency and traffic circulation. In addition two new assessment indexes are proposed: (i) exposure indices for population directly influenced by nitrous oxide, a representative pollutant, and (ii) a friction index between trips for attending elementary school and freight vehicle trips. It was found that from the perspective of physical distribution efficiency and traffic circulation, the "before" alternative is better than "after". However, from the aspect of traffic safety and environmental impacts the "after" alternative is better than "before". It is expected that the proposed evaluation method in this study would be useful when identifying reasonable policies for truck route management in urban areas.

Analysis of Building Energy Reduction Effect based on the Green Wall Planting Foundation Type Using a Simulation Program (건물일체형 패널형 벽면녹화 식재기반 유형별 건물에너지 성능 분석)

  • Kim, Jeong-Ho;Kwon, Ki-Uk;Yoon, Yong-Han
    • Korean Journal of Environment and Ecology
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    • v.29 no.6
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    • pp.936-946
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    • 2015
  • This study is aimed to analyze the reduction performance of building energy consumption according to planting base types of panel-type green walls which can be applied to existing buildings. The performance was compared to the general performance of green walls that have demonstrated effects of improving the thermal environment and reducing building energy consumption in urban areas. The number of planting base types was 4 in total, and simulations were conducted to analyze the thermal conductivity, thermal transmittance, and overall building energy consumption rate of each planting base type. The highest thermal conductivity by the planting base type was Case C (0.053W/mK), followed by Case B (0.1W/mK) and Case D (0.17W/mK). According to the results of energy simulation, the most significant reduction of cooling peak load per unit area was Case C (1.19%), followed by Case B (1.14%) and Case D (1.01%) when compared to Case A to which green wall was not applied; and the most significant reduction of heating peak load per unit area was estimated to be Case C (2.38%), followed by Case B (1.82%) and case D (1.50%) when compared to Case A. The amount of yearly cooling and heating energy use per unit area showed 3.04~3.22% of reduction rate. The amount of the 1st energy use showed 5,844 kWh/yr of decrease on average for other types when compared to Case A. The amount of yearly CO2 emission showed 996kg of decrease on average when compared to Case A to which the green wall was not applied. According to the results of energy performance evaluation by planting location, the most efficient energy performance was eastward followed by westward, southward and northward. According to the results of energy performance evaluation by planting location by green wall ratio, it was found that as the ratio of green wall increased, the energy performance displayed better results, showing approx. double reduction rate in energy consumption at 100% of green wall ratio than the reduction rate at 20% to 80% of green wall ratio.

Evaluation of Perception for Foodservice Hygiene by Middle School Students in Busan (부산지역 일부 중학생의 학교급식 위생에 대한 인식 평가)

  • Kim, Yeo Kyeong;Choi, Hee Sun;Lyu, Eun Soon
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.43 no.12
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    • pp.1920-1928
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    • 2014
  • The purpose of this study was to evaluate the importance and performance of middle school foodservice hygiene in Busan. In this study, questionnaires were administered to 1,000 students consisting of 100 students in 10 middle schools in Busan in December, 2013. The students assessed importance and performance of personal hygiene as 3.81 and 3.60 on a scale of 5.00, respectively. Males gave higher scores to importance and performance of personal hygienic than females. First grade students gave significantly higher scores than 2nd and 3rd grade students to importance and performance of personal hygienic. The mean scores of importance of foodservice hygiene were 4.47 for food hygiene, 4.25 for equipment hygiene, 4.23 for employee hygiene, and 4.19 for environment hygiene. For importance of foodservice hygiene, females gave significantly (P<0.001) higher scores than males. However, male gave significantly higher scores than females for performance of foodservice hygiene. The importance and performance grid showed important factors for personal and foodservice hygiene. 'Hand washing before eating the meal' for personal hygiene and 'cleanliness of tray' for foodservice hygiene showed the highest importance and lowest performance scores. Foodservice hygiene can be improved through customized education of students regarding meal service and food hygiene, equipment hygiene, and environment hygiene.

A User Profile-based Filtering Method for Information Search in Smart TV Environment (스마트 TV 환경에서 정보 검색을 위한 사용자 프로파일 기반 필터링 방법)

  • Sean, Visal;Oh, Kyeong-Jin;Jo, Geun-Sik
    • Journal of Intelligence and Information Systems
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    • v.18 no.3
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    • pp.97-117
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    • 2012
  • Nowadays, Internet users tend to do a variety of actions at the same time such as web browsing, social networking and multimedia consumption. While watching a video, once a user is interested in any product, the user has to do information searches to get to know more about the product. With a conventional approach, user has to search it separately with search engines like Bing or Google, which might be inconvenient and time-consuming. For this reason, a video annotation platform has been developed in order to provide users more convenient and more interactive ways with video content. In the future of smart TV environment, users can follow annotated information, for example, a link to a vendor to buy the product of interest. It is even better to enable users to search for information by directly discussing with friends. Users can effectively get useful and relevant information about the product from friends who share common interests or might have experienced it before, which is more reliable than the results from search engines. Social networking services provide an appropriate environment for people to share products so that they can show new things to their friends and to share their personal experiences on any specific product. Meanwhile, they can also absorb the most relevant information about the product that they are interested in by either comments or discussion amongst friends. However, within a very huge graph of friends, determining the most appropriate persons to ask for information about a specific product has still a limitation within the existing conventional approach. Once users want to share or discuss a product, they simply share it to all friends as new feeds. This means a newly posted article is blindly spread to all friends without considering their background interests or knowledge. In this way, the number of responses back will be huge. Users cannot easily absorb the relevant and useful responses from friends, since they are from various fields of interest and knowledge. In order to overcome this limitation, we propose a method to filter a user's friends for information search, which leverages semantic video annotation and social networking services. Our method filters and brings out who can give user useful information about a specific product. By examining the existing Facebook information regarding users and their social graph, we construct a user profile of product interest. With user's permission and authentication, user's particular activities are enriched with the domain-specific ontology such as GoodRelations and BestBuy Data sources. Besides, we assume that the object in the video is already annotated using Linked Data. Thus, the detail information of the product that user would like to ask for more information is retrieved via product URI. Our system calculates the similarities among them in order to identify the most suitable friends for seeking information about the mentioned product. The system filters a user's friends according to their score which tells the order of whom can highly likely give the user useful information about a specific product of interest. We have conducted an experiment with a group of respondents in order to verify and evaluate our system. First, the user profile accuracy evaluation is conducted to demonstrate how much our system constructed user profile of product interest represents user's interest correctly. Then, the evaluation on filtering method is made by inspecting the ranked results with human judgment. The results show that our method works effectively and efficiently in filtering. Our system fulfills user needs by supporting user to select appropriate friends for seeking useful information about a specific product that user is curious about. As a result, it helps to influence and convince user in purchase decisions.

Evaluation of Work Environment, Health Care Management and Exposure to Chemicals in the Workplaces Using Dimethylformamide (DMF) (디메틸포름아미드 취급 사업장의 작업환경 및 보건관리 실태와 노출요인 조사)

  • Hur, Soo-Jong;Suh, Chun-Hui;Lee, Chae-Kwan;Kim, Jeong-Ho;Kim, Dae-Hwan;Son, Byung-Chul;Lee, Chang-Hee;Chang, Goo-Rak;Lee, Jong-Tae
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.20 no.4
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    • pp.225-235
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    • 2010
  • This study was aimed to assess the status of working environment, health care management status and cause of exposure in manufactories using dimethylformamide (DMF). For the purpose, airborne concentration of DMF in the workplaces and N-methylformamide (NMF) in worker's urine were measured with job type and process. In addition, management of local exhaust ventilation system (LEV) and personal protective equipment (PPE) was evaluated at 35 work places (107 workers) located in Busan and Gimhae area. Mean DMF concentrations in work places by job type and process were of high level measured in printing and record media reproduction (5.23 ppm) and flaking process (2.48 ppm). Workers in adhesive job were measured a large amount of urine NMF (21.59 mg/). 98.1% of DMF handling workers were provided respirators, but 67.3% of those workers used them. The main reasons for not using respirators were inconvenience and difficulty of breathing. Airborne concentrations of DMF were higher in the workplaces in which LEVs were working abnormally, but there was not statistically significant. In addition, the urine NMF levels were correlated with management of LEV within the workers who did not use the respirators (p<0.048). These results implied that LEV should be installed and maintained properly to protect the workers from the exposure to DMF. Management of PPE should be also necessary to protect the workers from chemical hazards.

A Study on the Improvement of Myeongnyang Waterways' Traffic Separation Scheme (명량수도의 통항분리방식 개선에 관한 연구)

  • Dimailig, Orlando S.;Jeong, Jae-Yong;Kim, Chul-Seung
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.16 no.4
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    • pp.407-414
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    • 2010
  • The fairway within the area of Yul-do and Songdo located near the Myeongnyang-sudo approaches south of Mokpo harbor is well guided by traffic separation scheme and other navigational aids. However, that part of the waterways where Yul-do is located sits at the cross-roads of marine traffic and is subjected to some potential risks in the voyage navigation: the effect of climatic phenomenon, the disregard of most ships in using the western sector of the fairway creating a congestion in the eastern sector, and lastly, the disadvantageous erect of the location and height of Yul-do island that hinders good lookout. This study investigates the environmental conditions that prevailed in the area in the span of 5-year period and the marine traffic situation taken from the data within the 72-hour period The navigational hazards and marine casualties are also be presented. The results are analyzed and are made the basis of a proposal for an improved separation of traffic. Thereafter, an evaluation is carried out by using the components of marine traffic flow simulation and ES modeling index. It is evaluated through simulation by the use of full-mission ship handling simulator.

Evaluation of Kinetic Constant and Effect of Effluent Recycling in Wastewater Treatment from Fisheries Processing Plant using EMMC Process (EMMC공정을 이용한 수산물 가공공장 폐수처리에서 동력학적 인자 평가와 유출수반송의 영향)

  • Jeong, Byung-Gon
    • Journal of the Korean Society for Marine Environment & Energy
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    • v.12 no.1
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    • pp.1-8
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    • 2009
  • EMMC(Entrapped Mixed Microbial Cell) process which is a kind of active cell immobilizing method was applied to treat fisheries processing wastewater biologically. Kinetic constants were calculated for organic and nitrogen removal and effect of effluent recycling on system performance was evaluated also. Yield coefficient, Y showed relatively low value compared with Y value obtained from conventional activated sludge process. It means that EMMC process can reduce amount of excess sludge significantly compared with conventional activated sludge process. Endogenous respiration coefficient ke of EMMC process also showed relatively low value compared with that of conventional activated sludge process. Yield coefficient Y, endogenous respiration coefficient ke and half saturation constant ks obtained from EMMC process in terms of nitrification were compared with reported value from literature based on suspended growth nitrification system. The value of Y obtained from this study has no difference compared with values obtained from literature review and ke of this study was low but ks of this study was high compared than values obtained from suspended growth nitrification system. To evaluate the effect of internal recycling on system performance, system was operated with internal recycling ratio of 1.5Q, 2.0Q, 2.5Q and 3.0Q. increase of internal recycling ratio effect more greatly on improvement of denitrification efficiency than that of nitrification efficiency. Accordingly, optimization of internal recycling ratio has to be based on improvement of anoxic reactor performance.

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