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- 저자 : Tae Woon Nam (검색결과 221 건)
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Ni添加 CV黑鉛鑄鐵의 祖織과 機械的性質 및 熱物性値에 關한 硏究
南泰運,許甫寧,徐弘三 慶尙大學校 1987 論文集 Vol.26 No.1
In this sthdy, an easy production method of CV graphite cast with iron with small adition of NI which is known as the elements of the graphitizon was inverstigated. And so, the effects of physical, mechanical and thernal properties by fading time, carbon equivalent and Ni addition after the treatments with spheroidizer(Fe-Mg), were also investigated. The results obtained from this study were as follows: 1. With an increase of carbon equivalent the CV ratio was a little increased but with an increase of addition of Ni plus Mg the graphite numbers and CV rato were greatly increased. And so, the form and distribution of graphite were homogenized. 2. With an addition of Ni the ferrire ratio were decreased and the parlite ratio were a little increased. 3. With an increase of CE and fading time the mechanical properties (tensile strength, ased. And so, in case of Mg an Ni plus Mg addition the mechanical properties were greatly increased. 4. With an incease of CE and fading time the thermal properties(thermal diffusivity and conductivity ) were increased but with addition of Ni plus Mg the thermal properties were speroidal graphite ratio. 5. For the addition of Ni plus Mg the results were obtained that the decrease of lading effect the increase of inoculation effect, the increase of CV graphite ratio.
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AZ91D 합금의 기계적 특성에 미치는 유지온도 및 전단변형속도의 영향
박훈모,남태운 漢陽大學校 工學技術硏究所 1999 工學技術論文集 Vol.8 No.1
본 논문은 낮은 밀도, 높은 비강도, 우수한 기계 가공성, 진동 흡수성, 치수 안정성 등으로 인하여 크게 주목받고 있는 경량금속인 AZ91D합금의 레오캐스팅(Rheo casting)시 유지온도와 전단변형속도등의 공정변수가 재료의 미세조직과 인장강도와 경도등의 기계적 특성에 미치는 영향에 대하여 고찰하였다. 그 결과 교반에 의해 수지상정(dendrite)이 파쇄되고 구형화됨을 관찰할수 있었고, 교반속도가 증가함에 따라 입자간의 응집을 파괴하는 전단응력이 증가하여 초정입자의 크기가 감소하고 β상(Mg17Al12)의 입계석출이 증가함을 알 수 있었다. 또한 온도가 낮고 교반속도가 증가할수록 입자미세화와 β상의 석출 중가로 인하여 경도는 증가하였으나, 입계에 주로 석출하기 때문에 인장강도와 항복강도, 연신율은 감소하였다. In this study, the rheocasting solidification process was applied in the production of AZ91D alloy with low density, high strength, good castability, and damping capacity. Changes of microstructure and mechanical properties with different holding temperature and shear strain rates were investigated. Dendritic α-phase was fragmentated by stirring, the size was decreased with increasing shear strain rate, and precipitation of Mg17Al12 phase was increased with decreasing holding temperature and increasing shear strain rate. In tensile test, U.T.S and Y, S were decreased while hardness was increased with decreasing holding temperature and increasing shear rate. This tendency of mechanical properties was closely related with the behavior of Mg17Al12 phase.
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CV黑鉛鑄鐵의 黑鉛型態 및 機械的 性質에 미치는 Ni첨가 효과에 관한 연구
許甫寧,金水泳,南泰運,徐弘三,金學權 慶尙大學校 1985 論文集 Vol.24 No.1
In this study, an easy production method of CV (Compacted/vermicular) graphite cast iron with small addition of a Ni which is known as the element of the graphitization was investigated. And so, the effects of fading (holding) time and of Ni addition after the treatments with spheroidizer (Fe-Si-Mg-Ca-Al-Ti-Ce) were also investigated. The results obtained are as follows. 1. According as Ni contents in CV molten cast iron increase, the graphite No. and CV radio were increased. And so, graphite form and the distribution of the graphite were homogenized. 2. When the addition treated with Ni, the tensile strength were increased, and the effect of fading time were decreased.
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박 진,이경운,김춘호,김성중,조남수,안태훈 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3
A case of quadriplegia resulted from cervical penetrating wound was admitted to chosun university hospital intensive care unit, and undergone steroid therapy and antibiotics therapy. On the 6th hospital day, the septic complication was developed and it proved to be bacterial meningitis by CSF examination. Broad spectrum antibiotics was administered immediately after and the diagnosis and the patient was monitored carefully. The bacterial meningitis was improved and no other serious complication was developed. The patient was discharged with permanent neurologic deficit, quadriplegia.
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상지 단순반복작업 근로자의 수근관 증후군 유병률에 관한 조사
손지언,장태원,김윤규,홍영습,정갑열,김동일,이강진,하남진,김상범,김준연 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.3
목적 : 본 연구는 수근관 증후군의 발생위험이 높은 작업형태에 종사하는 상지 단순반복작업근로자로서 육류 및 어류 가공 사업장과 목재소 근로자에서 근전도검사를 이용하여 수근관 증후군의 유병률을 조사하고자 하였다. 방법 : 상지 단순반복작업근로자로서 육류 및 어류 가공 사업장 근로자 69명과 목재소 근로자 17명을 실험군으로, 관리직, 경리, 경비등 상지의 단순반복작업이 없는 근로자 28명을 대조군으로 선정하여, 작업적 및 병력조사, 이학적 검사와 근전도검사를 통해 수근관 증후군의 유병률을 조사하였다. 결과 : 수근관 증후군의 유병률은 육류 및 어류 가공 사업장과 목재소에서 각각 26.09 % (18명)와 29.41 %(5명)로 조사되었으며, 육류 및 어류가공사업장과 목재소 근로자를 '7년 이상과 미만의 작업기간'으로 층화하여 비교한 결과 '상지부위의 통증 호소 유무', 'Visual Analogue Scale(VAS: 총 10점) 4점 이상 여부', 'Tinel teat 양성 유무', 'Phalen test 양성 유무'는 모두 단기 작업근로자군에서 양성의 빈도가 증가되었고 '수근관 증후군 유무'는 장기작업근로자군에서 양성의 빈도가 증가되었다. 결론 : 육류 및 어류 가공 사업장과 목재소의 수근관 증후군 유병률은 각각 26.09 %와 29.41 %로 육류 및 어류 가공 사업장과 목재소는 1996년 OSHA가 지정한 바와 같이 위험한 작업요인이 있는 작업장으로 분류하여 관리되어야 할 것으로 생각된다. Objectives : This study was carried out to survey on the prevalence of Carpal Tunnel Syndrome(CTS) in high risk jobs(meat and fish processing plant and wood plant), by application of Nerve Conduction Study(NCS), a confirmatory diagnostic method. Methods : Experimental group was 69 workers sampled from meat and fish processing plants and 17 workers sampled from wood plants, who were simple, repetitive workers using upper extremities and control group was 28 workers sampled from managers, secretaries and keepers. All employees were examined through work history, physical examination and NCS. Results : 18 workers(26.09%) in meat and fish processing plants, and 5 workers(29.41%) in wood plants had compatible findings to NIOSH diagnostic criteria for CTS. The experimental group had more symptoms (complaint of upper extremities, Visual Analogue Scale ≥4(VAS: total 10 point)), signs(Tinel and Phalen test) and prevalence of CTS than control group(p<0.05). The prevalence of symptoms and signs were higher in short term workers(<7 years), but the prevalence of CTS was higher in long term workers(≥7 years). Conclusions : The prevalence of CTS in meat and fish processing plant and wood plant were 26.09% and 29.41% respectively. Authors propose that meat and fish processing and wood plants should be managed as a risk job category which were designated by OSHA in 1996
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남태운 ( Tae Woon Nam ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.2
The evolution of microstructures in two rapidly solidfied niobium microalloyed steels was studied. These alloys were rapidly solidified by two powder process techniques: nitrogen gas atomization and centrifugal atomization. It was found that in both powder processes, powder particles larger than 20㎛ diameter were martensitic, and that the nitrogen gas atomized particles solidified cellularly while those that were centrifugally atomized tended to solidify dendritically. Particles smaller than 1㎛ were not completely characterized because of wide variation in composition.
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