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치과용 시멘트에 따른 주조금관의 응력 분포에 대한 고찰
김지환 高麗大學校 倂設 保健大學 保健科學硏究所 1994 保建科學硏究論集 Vol.3 No.1
The purpose of this study was to compare difference in the stress distributions of crown according to dental cements under static load. To evaluate the stresses of crown, dental cement, abutment tooth, a mandibular first molar was used and prepared to same dimension. According to the FEM modelling method, the casting gold crown was designed. The teeth and the casting gold restorations were divided into three groups and modelled on computer as natural condition, 12㎏ of static force was loaded individually each two point of crown; buccal cusp tip, central fossa. The Von Mises stresses developed in the casting gold restoration according to dental cements. The Von Mises stress as were measured at buccal and lingual slope between crown and cement and abutment. The form of crown was designed ; thickness of functional cusp - 1.5㎜, central fossa - 1.0㎜. A two dimensional stress analysis model was constructed to represent a mandibular first molar. Finite element models were created and analysed using software SUPER SAP for IBM AT 386 personal computer. The results obtained were as follows ; 1. On loading condition, there was significant difference according to dental cements. 2. There were proportional relationship between cement's strength and stress distribution. 3. On loading condition vertically, stress was distributed more favorably in zinc phosphate cement than others.
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김지환,지승묵,윤영식,여종석 한국진공학회 2018 Applied Science and Convergence Technology Vol.27 No.6
Selective laser melting (SLM) is a promising additive manufacturing technique applied to various areas such as aerospace and biomedical industries. Because product characteristics can be controlled by SLM process parameters, several investigations have been conducted to clarify the relationship between process parameters and product characteristics. Melt pool, controlled by process parameters, is a suitable resource to determine the product profile accuracy and mechanical property. Two laser types, continuous wave (CW) and pulse width modulation (PWM), are typically used in SLM processes, and each has distinct advantages depending on the purpose of the process. While CW maintains its power constant, PWM presents a repeated pattern with a pulse width. Herein, the main differences in the process parameters between the two laser types and their effects on the melt pool formation during the SLM process are explained. The results demonstrate that CW and PWM are favorable for dense and fine structures, respectively.
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SM45C 와 STD_(11)의 CW Nd:YAG 레이저 표면경화 특성비교
김지환,유영태,신호준,오용석 조선대학교 에너지.자원신기술연구소 2003 에너지·자원신기술연구소 논문지 Vol.25 No.1
Laser surface hardening is an effective technique used to improve the tribological properties and also to increase the service life of automobile components such as camshafts, crankshatfs, lorry brake drums and gears. High power CO_(2) lasers and Nd:YAG lasers are employed for localized hardening of materials and hence are of potential application in the automobile industries. The heat is conducted rapidly into the bulk of the specimen causing self-quenching to occur and the formation of martensitic structure In this investigation, the microstructrual features occurring in Nd:YAG laser hardening SM45C and STD_(11) steel are discussed with the use of optical microscopic and scanning electron microscopic analysis. Moreover, This paper describes the optimisation of the processing parameters for maximum hardened depth of SM54C and STD_(11) steel specimens of 4.5㎜, 10㎜ thickness by using CW Nd:YAG laser.
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김지환 한국동학학회 2005 동학연구 Vol.0 No.19
청일전쟁 시기에 중국의 軍事와 外交를 총괄한 李鴻章의 외교노선은 중국의 전통적 외교방식인 以夷制夷의 틀에서 크게 벗어나지 못하였다. 청일전쟁 직전에 중국에서는 열강의 세력 확대에 대한 대응과 관련하여 李鴻章을 대표로 하는 주화파와 翁同龢를 대표로 하는 주전파로 의견이 나뉘어 있었다. 주전파는 열강의 침입에 대한 강경 대응과 반이홍장이라는 공통점을 가지고 있었으나 중일 간의 군사력 격차에 대한 정확한 인식을 결여하고 있었다. 반면 주화파는 군사실무 담당자의 현실에 대한 인식으로부터 출발한 것이라 할 수 있다. 청일전쟁에 직면하여 이홍장은 영국과 러시아의 중재를 통한 외교적 해결을 모색하였으나, 러시아는 중국을 원조할 경우 영국의 침략을 유발할 것을 우려 하여 사실상 중립을 표명하였다. 더욱이 영국은 러시아 세력의 확대를 저지하기 위해 일본을 동방의 맹방으로 간주하였으며, 사실상 일본의 중국 침략을 용인하였다. 이러한 결과 열강을 통한 외교적 해결이라고 하는 중국의 외교정책은 사실상 실패로 끝나고 말았다. 청일전쟁 이후, 중국은 러시아의 삼국간섭을 통해 일본의 요동반도 조차를 좌절시킬 수 있었지만, 이러한 결과 제국주의 러시아에게 막대한 대가를 치루었을뿐 아니라, 러시아의 침략성이 드러나자 이를 견제하기 위해 또 다시 유사한 이권을 기타 열강에게도 넘겨주지 않으면 안되었다. 이는 이이제이식 외교정책의 완전한 실패를 의미하여, 중국의 반식민지적 성격을 더욱 심화시켜 나가는 결과를 초래하였다.
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수용액중에서 산소에 의한 Co-Ni 공심수산화물의 산화반응 거동에 관하여 : 페라이트법에 의한 중금속 폐수처리에 관한 연구 제2보
김지환,오재현,강남기 대한금속재료학회(대한금속학회) 1990 대한금속·재료학회지 Vol.28 No.12
The oxidation behaviors of Co-Ni hydroxide coprecipitates were investigated with relation to the conditions of the solution such as R value(=2〔OH^-〕 / 〔SO^(2-)₄〕), temperature and initial 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 molar ratio. The characteristics of reaction products were examined by composition analysis, XRD, TEM and magnetic property measurement. When increasing R value, the reaction time and particle sizes were increased. And the reaction products were Co-Ni ferrite. The amount of Co incorporated into the spinel structure increased and that of Ni decreased with increasing R value and temperature. In reaction products represented by Co, Ni_yFe_(3-(x+y))O₄, the amount of (x+y) shows the ranges between 0.6 and 0.7, regardless of R value and temperature. In the conditions of R=1.5, 70℃, 〔Co(Ⅱ)+Ni(Ⅱ)〕/〔Fe(Ⅱ)〕 ratio 0.5, 〔Ni(Ⅱ)〕/〔Co(Ⅱ)〕 ratio =2.0 in the initial solution, Co and Ni incorporated with equal amounts into spinel structures and the reaction product of Co_(0.29)Ni_(0.29)Fe_(2.41)O₄ was obtained.
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경기도 지방정부 및 공공기관의 ESG 경영 추진현황과 과제
김지환 한국환경경영학회 2022 환경경영연구 Vol.14 No.-
경기도는 국내에서 중소기업 밀집도가 가장 높은 지방정부로서 중소기업의 육성, 지원에 대 한 책임을 고려할 때 ESG 이슈는 중요한 대응 과제이다. 본 연구의 목적은 경기도 지방정부 및 공공기관에 대한 ESG 대응 실태를 조사 분석하여 ESG 경영 현황 및 취약점을 파악하고 애로 사항과 지방정부 차원의 지원방안을 파악하여 대응 과제를 제안하는데 있다. 이를 위해 본 연 구에서는 경기도의 지방정부 및 공공기관의 ESG 경영 대응 필요성에 대한 인식과 준비 수준, ESG 경영 실천현황 조사 및 취약 부문, ESG 대응을 위한 애로사항과 지방정부의 지원 사항 을 설문조사 했다. 먼저 조직의 ESG 경영 대응 필요성에 대해 응답기관의 대부분이 ESG 경영 이 필요하다고 응답했으며, 공공기관이 지방정부보다 ESG 경영의 필요성을 높게 인식하는 것 으로 나타났다. 결론으로 ESG 전문가 양성을 위해 지방정부가 전략적인 인적자원 개발 계획을 수립하고, 인력양성 프로그램을 운영하며, 경기도 주관 ESG 전문가 양성 자격제도를 운영할 것을 제안한다. Gyeonggi-do is a local government with the highest concentration of SMEs in Korea. Considering Gyeonggi-do's responsibility for nurturing and supporting SMEs, ESG issues are an important response task. The purpose of this study is to identify the current status and weaknesses of ESG management, and to suggest challenges by identifying difficulties and support measures at the local government level. In conclusion, it is suggested that local governments establish a strategic human resource development plan for nurturing ESG experts, operate a manpower nurturing program, and operate an ESG expert nurturing qualification system hosted by Gyeonggi-do.
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김지환,오세윤,김웅철,유진호,김태석,이준석,이원철 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.2
This study was carried out to investigate psychiatric stress symptoms and stress- inducing factors, such as role overload, work demand, work procedure and so forth in korean dental laboratory technicians. Questionnaires were mailed to randomly selected 1000 dental technicians who were systematically selected. Among them, 786 dental technicians completed the questionnaires and returned them. Validity test and reliability test on the questionnaires were done prior to the main survey, using the SCL-90-R as a standard. Stress-inducing factors were identified with a multiple regression analysis on the continuous variables. To investigate stress-inducing factors on stress symptoms, analysis on distribution of characteristics was performed, and then correlation analysis and multiple regression analysis was carried out. The results of the study were as follows: According to multiple regression analysis, there was a statistical correlation between stress symptoms and role overload, work procedure, occupation conflict, interpersonal relationship, social support, personality traits in stress symptom(GSID). The stress symptoms in korean dental laboratory technicians seemed to be mostly job related ones, and considering the results obtained from the study, it is suggested that reducing work load and proper health promotion programs for dental technicians be necessary.
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