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김정근(Jeongkeun Kim),황지은(Jieun Hwang),조금남(Keumnam Cho) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Present study aimed to measure frost characteristics and heat transfer rate of fin-tube heat exchanger of heat pump with respect to fin pitch under frosting condition. The test conditions were air temperature of 2℃, absolute humidity of 3.67 g/kgDA, air velocity of 1.5 m/s, and coolant temperature of -10℃. The coolant was ethylene-glycol aqueous solution with concentration of 50%. The performance of large fin pitch of the flat plate was better about 10% than that of low. But the performance of 1.3mm was the best in case of the louver fin.
김정근(Jeongkeun Kim),박원걸(Wonkeol Park),조금남(Keumnam Cho) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
Present study aimed to measure frost characteristics and heat transfer rate of fin-tube heat exchanger of heat pump with respect to fin horizontal pitch under frosting condition. The test conditions were air temperature of 0.5∼7℃, absolute humidity of 3.67∼4.01 g/kgDA, air velocity of 1.5∼2.5m/s, and coolant temperature of -15∼-10℃. The coolant was ethylene-glycol aqueous solution with concentration of 50%. The accumulated performance of large fin horizontal pitch was better about 35% than that of normal at same time. But the initial heat transfer rate was similar because of the surface temperature of fin.
사회복지종사자가 인식하는 위험이 조직헌신도에 미치는 영향
김정근(Kim, Jeongkeun),최재원(Choi, Jaewon) 한국공공사회학회 2018 공공사회연구 Vol.8 No.2
본 연구는 부산지역 사회복지시설 종사자 958명을 대상으로 종사자가 인식하는 위험(risk)이 조직헌신도에 미치는 영향을 분석하고 클라이언트 폭력 피해 경험의 매개효과를 검증하고자 하였다. 분석결과, 종사자가 인식하는 위험수준이 높을수록 조직헌신도가 낮은 것으로 확인되었으며, 클라이언트로부터의 폭력 피해 경험이 있는 종사자가 폭력 피해 경험이 없는 종사자 보다 조직헌신도가 더 낮은 것으로 분석되었다. 또한, 폭력 피해 경험의 매개효과에 대한 검증결과, 부분 매개효과가 있는 것으로 나타났다. 분석결과를 토대로 사회복지종사자의 안전한 근무환경 마련을 위한 정책적 · 실천적 대안을 제시하면 다음과 같다. 첫째, 사회복지종사자 위험관리를 위한 법 · 제도적 장치를 마련할 필요성이 있다. 둘째, 사회복지종사자 위험실태에 대한 정기적인 조사와 체계적인 자료 관리가 필요하다. 셋째, 사회복지종사자들이 경험할 수 있는 여러 가지 위험상황을 적절히 대처할 수 있는 매뉴얼을 개발·보급하고 관련 교육을 강화할 필요성이 있다. 이와 더불어, 사회복지종사자 위험척도 개발 등 사회복지 실천 현장의 위험에 대한 지속적인 관리가 필요함을 제시하였다. The purpose of this study is to analyze the effect of the risk perceived by 958 social workers who work in social welfare facilities on organizational commitment to investigate the mediating effect of the damage experience by client violence in Busan. The results of the analysis showed that the organizational commitment of workers who experienced violence damage gets lower than that of workers without violence damage experience, as the risk perceived by the social workers is higher. In addition, as a result of the mediating effect of violence experience, partial mediation was found. Based on the results of the analysis, the policy and practical alternatives for a safe working environment of the social welfare workers are presented as follows: First, there is a need for providing legislative and institutional mechanisms for the risk management of social workers. Second, it is necessary to conduct periodic surveys on the actual risk conditions of social workers and systematic data management. Third, there is a need for developing and disseminating manuals to cope with the various risk situations that social welfare workers are likely to experience to strengthen related education. Finally, it suggests that continuous management of the risk in social welfare practice sites such as the development of a social worker risk scale would be necessary.
김관희(Guanhee Kim),임종훈(Jonghun Lim),서관호(Kwanho Seo),김정근(Jeongkeun Khim) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
91 domestic vehicles have been tested according to Korean New Car Assessment frontal crashworthiness test protocol, and 52 out of the 91 vehicles are rated 5 star, which means the highest frontal crashworthiness. Only 12.5% of the test vehicles were rated 5 star before 2002 while 73.1% of the test vehicles were rated 5 star since 2003. The portion of 5 star rated vehicles are increased by 6 times during the last ten years. Even though vehicle frontal crashworthiness improved, the deaths in frontal crash impact do not decreased. In 2012, 329 occupants were died in frontal crash, this is 17.1% decreased compare to that of 2002, but the deaths in frontal crash occupies about 15.7% of the vehicle to vehicle deaths and this is 1.3%P higher than that of 2002. This figures show that the KNCAP frontal crashworthiness test protocol does not enough to reflect the real world frontal crash accident. In this study we conducted small overlap frontal crash according to IIHS test protocol, which occupies high portion of deaths in frontal crash, to evaluate vehicle frontal crashworthiness.
오선희(Sun Hee Oh),장재철(Jeachul Jang),조종표(Chongpyo Cho),김정근(Jeongkeun Kim),방유마(Yu-ma Bang),강용태(Yong Tae Kang),박성룡(Seong-Ryong Park) 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
In this study, it is a laboratory-scale study to save the electric energy required for hydrogen production by additionally using heat from SRF(Solid Refuse Fuel) in the process of producing hydrogen through electrolysis. The design of combustion chamber was based on detailed heat balance reflecting the SRF fuel characteristics. The superheater was designed the helical coiled tube of SUS316L. The total length of the superheater is about 30m and the total volume of combustion chamber is 2.0 ㎥. In the future, the basic data will be collected through the test of a laboratory system and the basis of decision will be provided on the applicability of large incinerator system.