전기공사 현장 안전관리자의 직무자원, 직무요구 및 조직몰입의 영향 연구

서현정,김남균,손민지,홍아정,Seo, Hyun Jeong,Kim, Nam Kyun,Son, Minjie,Hong, Ah-Jeong 한국안전학회 2021 한국안전학회지 Vol.36 No.2

This study was conducted to suggest a direction in which safety managers can concentrate on industrial accident prevention and safety management for the organization. The job resources of safety managers were divided into organizational and individual levels, and the magnitude of the impact on organizational commitment was compared. Furthermore, job demands were classified into environmental risk factors and personal psychological factors to confirm their effect on organizational commitment. The moderating effect of job resources and sub-factors of the variable in the relationship between job demands and organizational commitment was verified. In this study, a questionnaire survey was conducted on 193 safety managers in the domestic electric construction business, data were collected, and a questionnaire of 180 people was used for the final analysis. Based on the results, organization-level resources among the sub-factors of job resources and individual psychological factors among the sub-factors of job demand had a more significant influence on organizational commitment. In the relationship between job resources and organizational commitment, the moderating effect of job demand was verified, confirming that job demand had a negative moderating effect. Individual psychological factors had a modulating effect, whereas environmental factors did not. The significance, implications, and limitations of this study are discussed based on the research results.

안전리더십 연구에 대한 체계적 문헌고찰

서현정,홍아정,Seo, Hyun Jeong,Hong, Ah-Jeong 한국안전학회 2020 한국안전학회지 Vol.35 No.6

In order to establish a conceptual basis and future research direction of safety leadership, this study reviewed domestic and foreign research trends related to safety leadership through systematic literature review methods. The literature search was conducted by combining terms related to safety leadership without limiting the period databases. A total of 195 documents were found, of which the final 59 were used for analysis. As a results, the safety leadership study was the most frequent in relations among variables. The most leadership types were based on transactional leadership and transformational leadership. In addition, studies have been conducted to categorize safety leadership as an independent concept. Safety leadership was mainly studied in the fields of safety engineering, disaster prevention, and business administration. Quantitative studies were mainly conducted to research methods. Based on the results, the research trend related to safety leadership was discussed, and suggestions for future research direction was presented.

건축용 난연 목재 개발에 대한 실험 연구

서현정,김남균,조정민,이민철,Seo, Hyun Jeong,Kim, Nam Kyun,Jo, Jeong Min,Lee, Min Chul 한국안전학회 2017 한국안전학회지 Vol.32 No.5

This study investigates fire-retardant performances and combustion/thermal characteristics of fire-retardant treated wood by comparing them with those of fire-retardant untreated wood from the expreimental resutls of cone calorimeter and thermo-gravimetric(TG) analyzer. Hazardousness of combustion product gases for fire-retardant treated wood and untreasted wood were also observed from the results of internal finish material incombustibility test according to the Korea standard code of KS F 2271. In this study, we also tried to improve the fire retardant performance of wood by applying fire-retardant chemical composites, and to secure the fire safety performance in buildings. Red pine (Pinus densiflora) was selected as a test specimen because it is mostly used as a building material in Korea. Fire retardant chemical composites (FRCs) were prepared by mixing boron, phosphorous, and nitrogen species and treated by press-impregnation method. Water-based FRCs were composed of 3% boric acid($H_3BO_3$), 3% borax decahydrate($Na_2B_4O_7$), 8% ammonium carbonate($(NH_4)_2CO_3$), diammonium phosphate ($(NH_4)_2HPO_4$) varied from 10-30% and potassium carbonate($K_2CO_3$) varied from 10-30%. From the test results of cone calorimeter, TG analysis and gas hazard assessments, newly proposed were the optimal composition and production methods of FRCs which can sufficiently meet fire-retardant level 3 based on Korea law of construction. Thus, the FRCs, developed in this study, are anticipated to contribute to the improvement of fire safety and widespread of usage in wood as building materials.

난연처리 국산 침엽수재의 연소특성 분석

서현정(Hyun Jeong Seo),황욱(Wuk Hwang),이민철(Min Chul Lee) 한국연소학회 2017 한국연소학회지 Vol.22 No.2

In this study, we measured that fire characteristics of four wood species using indoor finish materials. Wooden specimens were treated with fire retardant chemicals such as diammonium phosphate and potassium carbonate. The wooden specimens are Larix kaempferi, Pinus koraiensis, Cryptomeria japonica, and Chamaecyparis obtusa, which are used for indoor finish. The heat release rate (HRR) values of fire retardant treated woods were confirmed lower than that of untreated woods. For specific details, the HRR values of vacuum impregnated specimens for Pinus koraiensis and Cryptomeria japonica were measured lower than coatings. However, those of Larix kaempferi and Chamaecyparis obtusa showed the opposite effect to it. Total heat release rate values of all wooden specimens, vacuum impregnated were lower than coated specimens.

국내 유용 해외 목재 수종의 연소특성 평가

서현정 ( Hyun Jeong Seo ),강미란 ( Mee Ran Kang ),박정은 ( Jung Eun Park ),손동원 ( Dong Won Son ) 한국목재공학회 2016 목재공학 Vol.44 No.1

본 연구는 국내에서 주로 사용되는 수입 목재 수종의 화재 안전성 평가에 대한 기초 자료를 구축하기 위하여 연소 및 열적 특성을 분석하였다. 연소 특성은 KS F ISO 5660-1 규정에 의거한 콘 칼로리미터 시험 방법으로 열방출률, 총방출열량, 연소 가스 발생, 그리고 중량 감소를 분석하였다. 열적 안정성은 열중량 분석(Thermogravimetric analysis)을 통해 시료의 열분해 온도 및 시점을 확인하였다. 분석된 수종은 국내 유용 수입 수종으로 멀바우(Merbau), 멤페닝(Mempening), 가로가로(Garo Garo), 말라스(Malas), 그리고 딜레니아(Dillenia)로 총 5수종을 선정하여 실험을 실시하였다. 열방출률 값은 말라스 > 멤페닝 > 가로가로 > 멀바우 > 딜레니아 순으로 확인되었다. 총 방출열량을 분석한 결과, 멤페닝 > 말라스 > 가로가로 > 멀바우 > 딜레니아 순으로 측정되었다. 가스분석 결과에서는 딜레니아가 CO/CO2비율이 최대치로 0.034로 확인되었고, 멤페닝과 말라스가 0.020으로 최소치를 나타내었다. 중량감소율의 최솟값은 딜레니아가 74.79%로 나타났으며, 말라스가 83.52%로 CO와 CO2의 발생과 목재 연소의 거동과의 상관관계를 나타내었다. 수종별 열분해 온도는 멀바우 348.07℃, 멤페닝 367.57℃, 가로가로 350.59℃, 말라스 352.41℃, 딜레니아 364.33℃로 확인되었다. The purpose of this study is to analyze the combustion and thermal properties in order to establish baseline data for the fire safety evaluation of imported wood. The combustion properties such as heat release rate, total heat release, gas yield, and mass loss were analyzed by the method of cone calorimeter test according to KS F ISO 5660-1 and thermogravimetric analysis (TGA). Analyzed species are five kinds of species as Merbau, Mempening, Garo Garo, Malas, and Dillenia. The heat released rate values showed the highest value of Malas as 375.52 kW/m2, and Dillenia showed the lowest value as 133.30 kW/m2. The data values were confirmed in the following order: Malas > Mempening > Garo Garo > Merbau > Dillenia. In case of the total heat release, it was measured in the following order: Mempening > Malas > Garo Garo > Merbau > Dillenia. The gas analysis results were that Dillenia showed the highest value of 0.034. Also, Mempening and Malas showed the lowest at 0.020 in the CO/CO2. Min of mass reduction was shown as 74.79% Sargent cherry, on the other hand, Malas had a 83.52%. It showed a correlation between and of the CO and CO2 generation and combustion characteristics of wood. The thermal decomposition temperature of the wood in the TGA were as follow that Merbau 348.07℃, Mempening 367.57℃, Garo Garo 350.59℃, Malas 352.41℃, Dillenia 364.33℃. The aim of this study is to determine the combustion properties of imported wood according to ISO 5660-1. And, based on the results of this study, we would proceed with further research for improving the fire safety of wood for construction.

딥러닝을 통한 콘크리트 강도에 대한 배합 방법 예측에 관한 연구

최주희 ( Choi¸ Ju-hee ),양현민 ( Yang¸ Hyun-min ),이한승 ( Lee¸ Han-seung ) 한국건축시공학회 2021 한국건축시공학회 학술발표대회 논문집 Vol.21 No.2

This study aims to build a deep learning model that can predict the value of concrete mixing properties according to a given concrete strength value. A model was created for a total of 1,291 concrete data, including 8 characteristics related to concrete mixing elements and environment, and the compressive strength of concrete. As the deep learning model, DNN-3L-256N, which showed the best performance on the prior study, was used. The average value for each characteristic of the data set was used as the initial input value. In results, in the case of ‘curing temperature’, which had a narrow range of values in the existing data set, showed the lowest error rate with less than 1% error based on MAE. The highest error rate with an error of 12 to 14% for fly and bfs.

수용성 방염액 처리 목재의 방염 성능 및 가스유해성 분석

서현정(Seo, Hyun Jeong),김남균(Kim, Nam Kyun),조정민(Jo, Jeong Min),이민철(Lee, Min Chul) 한국방재학회 2017 한국방재학회논문집 Vol.17 No.4

본 연구에서는 최근 친환경 재료에 대한 의식의 변화로 인한 목재의 실내 사용 증가에 따른 화재 위험성을 절감하기 위하여 붕소-인계, 암모늄계 화학종을 혼합하여 제조한 방염액을 처리한 방염 목재의 방염 성능 및 연소 특성에 대하여 평가하였다. 방염액은 친환경성과 목재 표면 처리 시 발생할 수 있는 백화 현상을 고려하여 붕소-인계 성분을 조절하고 방염 성능을 향상하기 위하여 암모늄계 화학종을 첨가하여 혼합 제조하였다. 본 연구에서 처리된 방염 목재는 국내에서 실시되고 있는 방염성능평가기준(KOFEIS 1001)에 의거하여 성능 평가를 실시하였으며, 연소 시 방출되는 가스유해성을 확인하기 위해 KS F 2271 기준을 적용하였다. 방염성능평가 시험 결과, 상용 방염액 2종과 비교하였을 때 자체 개발된 방염액 FRCs의 성능이 유사하게 나타났으며, 무처리 시험편에 비해 FRCs를 처리한 시험편의 탄화면적은 약 80%, 탄화길이는 약 50%로 감소된 것으로 확인하였다. 방염액 3종을 비교한 가스유해성 평가의 결과에서는 상용 방염액 2종의 경우 각각 7분 24초, 7분 54초로 확인되어 성능 기준을 만족하지 못하였으나, FRCs 처리 시험편의 경우 9분 44초의 결과를 나타내어 규격을 만족하였다. 본 연구는 목재 및 목질재료용 방염액의 적정 혼합비율을 개발하여 향후 건물 실내 적용 시 화재 확산을 억제하고 유해가스 성분 방출을 감소시키는 연구를 진행하는 데 목적이 있다. This study carried out analysis of the flame-retardant performance and hazards in gas products according to the flame retardant performance standard of KOEFIS 1001 and the test procedure of KS F 2271 for incombustibility internal finish material and element of buildings (KS F 2271). Flame retardant chemical composites (FRCs) was prepared by adding boron-phosphorus and nitrogen element content. When manufacturing FRCs, environmentally friendliness and whiteness on the surface of wood as well as the content ratio of the boron-phosphorus chemical compounds were considered. As a result of flame retardant performance test, the performance of FRCs was similar in comparison with the two flame retardant solutions. Also, the carbonization area of the FRCs reated specimens was reduced to about 80%, and carbonization length was reduced to about 50% in comparison with untreated specimens. The results of the gas hazard test comparing the three flame retardants showed that two commercial flame retardant solutions were 7 minutes 24 seconds and 7 minutes 54 seconds, respectively, however, the FRCs treated specimens showed a result of 9 minutes and 44 seconds. And the result was satisfied with the limits defined in the specification. The purpose of this study is to develop appropriate mixing ratio of flame-retardant solution for wood and wood-based material of building applications, and to suppress fire spread and to reduce the emission of harmful gas components.

비 안전등급 케이블의 연소생성물 및 인체유해성 평가 연구 필요성

서현정(Seo Hyun Jeong),김남균(Kim Nam Kyun),조정민(Jo Jeong Min),이민철(Lee Min Chul),이상규(Lee Sang Kyu),문영섭(Moon Young Seob) 한국방재학회 2018 한국방재학회논문집 Vol.18 No.2

The present study has been conducted to investigated the gas toxicity of two kinds of non class 1E cable jackets and insulations (produced by A company and B company) according to Naval Engineering Standard (NES) 713. From the NES 713 standard, CO2, CO, NOX, HCHO, HCl, HBr, and HCN were detected for both types of cable jacket and insulation materials, and the toxicity index was calculated according to the standard code of US Department of Defense (MIL-DTL). The toxicity factors were obtained as 5.08 for the cable jacket of A company, 4.78 for cable insulation of A company, 4.85 for the cable jacket of B company, and 4.01 for the cable insulation of B company. These results can be used as basic data to increase the necessity of establishment of the regulation standards to evaluate the human hazardousness of non class 1E cables. 본 연구에서는 비안전등급 케이블의 피복재 및 절연재의 연소가스 유해성을 영국 해군 규격인 Naval Engineering Standard(NES) 713 규격에 의거하여 분석하였다. 또한 독성지수의 구체적인 분석을 위해 미국국방성 규격(MIL-DTL)을 적용하여 세분화하여 유해성을 평가하였다. 케이블은 A사와 B사 등 국산 케이블 2종을 적용하였고, 각 케이블의 피복재 및 절연재에서는 이산화탄소, 일산화탄소, 질산화물, 염화수소, 브롬화수소가 공통적으로 방출되었다. 독성 지수는 A사 케이블 피복재 5.08, 절연재가 4.78, B사 케이블 피복재가 4.85, 절연재가 4.01로 산출되었다. 해당 데이터는 비 안전등급 케이블의 인체유해성을 평가하는 규격의 필요성을 재고하기 위한 기초 데이터로 활용될 예정이다.

주요 실내 사용 목재의 연소 특성

서현정(Seo, Hyun-Jeong),손동원(Son, Dong-Won) 대한건축학회 2015 대한건축학회 학술발표대회 논문집 Vol.35 No.1

비 안전등급 케이블의 연소특성에 관한 실험적 연구

서현정(Hyun Jeong Seo),이민철(Min Chul Lee),김남균(Nam Kyun Kim),이상규(Sang Kyu Lee),문영섭(Young Seob Moon) 한국연소학회 2019 한국연소학회지 Vol.24 No.1

The occurrence of a cable fire in a nuclear power plant can cause significant damage to the internal equipment and the defense system, and even reactor melt down in the worst case. In addition, toxic gases, released by burning cable jacket and insulation materials, can hinder human evacuation and fire fighting activities. Thus, this experimental study was conducted to investigate the toxicity of two non-class 1E cables which are applied to the nuclear power plants in Korea. Experiments were conducted for two kinds of cables according to the standard code of ISO 19702, and time series heat release rate, total heat release, and the concentration of toxic gases including CO, CO₂, HCl, HCN, HBr, HF, NOx and SO₂ were measured From the test results, the similar characteristics between heat release rate and CO₂ emission and production of a small amount of halogenated compounds in emission gas caused by addition of fireproof components have been found. These results can be used as baseline data when assessing combustion characteristics and human toxicity of electric cables.