http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이정하(Lee Jung Ha),박태원(Park Tae Won) 도시정책학회 2018 도시정책학회 학술대회 Vol.2018 No.1
Since the Constitutional Court ruled in July 1999 that the private urban planning facilities were subject to the violation of private property rights, the government has adopted a sunset system for urban parks. While the private business owner s size of urban parks was lowered from 80 % to 70 % in 2014, the cause of the controversy over the project was changed from 100,000㎡ or more in total urban parks to 50,000㎡ or more. Therefore, this study analyzes the causes of failure in the public park formation projects based on the cases in which conflicts are emerging in analyzing similar systems abroad and promoting projects, and analyzes the causes of failure through related experts and surveys. In addition, the causes of conflicts are different, local sentiments and development conditions are different, and the limit of urban park management and response plans for future urban urban planning based on projects focused on the business feasibility and retrofittibility are limited, and urban park plans are less than 50,000㎡.
열분석법에 의한 Al-2,1Li-2.9Cu합금의 석출현상에 미치는 In 첨가의 영향
박태원,송영범,이용윤 ( Tae Won Park,young Beum Song,Yong Yun Lee ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.4
A study was conducted to examine the effects of In addition on the precipitation behaviors of Al-2.1Li-2.9Cu alloy by differential scanning calorimetry, transmission electron microscopy and microhardness tester. DSC analysis was measured over the temperature range of 25∼50℃ at a heating rate of 2∼20℃/min. The heat evolution peaks due to the formation of GP zone and δ` phase shift to higher temperature and the peaks to T₁and θ` phases shift to lower temperature by In addition. From this result, it was proved that the formation of GP zone and δ` phase is suppresed whereas that of T₁and θ` phases are accelerated by the In addition of 0.15wt%. The age hardening curve aged at 190℃ showed that the In bearing alloy(alloy B) has more faster age hardening response and a higher peak hardness than In-free alloy(alloy A), attributed to the fine and homogeneous distribution of T₁and θ` phases. The activation energies for the formation of δ`phase in In-free and In-bearing alloys are 22.3㎉/㏖ and 18.6㎉/㏖, respectively. Those for T₁(+θ`) phase of In-free and In-bearing alloys are 24.3 and 37.5㎉/㏖, respectively. Quenched-in excess vacancies play an important role to the formation of precipitates.
Cu를 함유한 저합금 고장력강의 기계적 성질에 미치는 열처리의 영향
박태원,심인옥,김영우,강정윤,Park, Tae-Won,Sim, In-Ok,Kim, Yeong-U,Gang, Jeong-Yun 한국재료학회 1995 한국재료학회지 Vol.5 No.3
Cu를 함유한 2종의 저합금 고장력강(HSLA-A, HSLA-B)\ulcorner 기계적 성질에 미치는 시효처리의 영향을 조사하였다. 탄소량이 적음에도 불구하고 Cu첨가로 석출물을 생성시킴으로서 2합금 모두 $650^{\circ}C$에서 시효한 경우 양호한 강도(HSLA-A:Y.S 703Mpa, E.L 22.6% HSLA-B:Y.S 810 Mpa, E.L 23.8%)와 인성(HSLA-A:271.4J, HSLA-B:197.5J at -5$0^{\circ}C$)의 조합을 나타내었다. 50$0^{\circ}C$에서 시효할 때 가장 높은 항복 강도를 나타내나 인성은 아주 낮은 값을 나타내었다. 50$0^{\circ}C$이상 시효 온도가 증가하면 강도는 감소하고 인성은 증가하였다. HSLA-B강의 강도가 HSLA-A 강보다 높은데, \ulcorner칭 상태에서의 강도 차이는 경화능을 증가시키는 원소인 Ni, Mn, Mo, Cu의 첨가량 차이에 의한 기지 조직의 차이에 의한 것이며, 시효한 상태에서의 강도 차이는 기지 조직과 석출 강화에 기여하는 Cu량의 차이에 의한 것으로 판단된다. 시효 경화 곡선에서 $700^{\circ}C$에서의 경도 증가는 오스테나이트-페라이트 2상 영역으로부터 냉각시 생성된 “M-A constituents”에 의한 것이다. HSLA-A강과 HSLA-B강의 충격 천이 온도는 각각 -1$25^{\circ}C$와 -145$^{\circ}C$이었다.
건강근로자효과 보정 전후의 메타 분석 결과 비교 -직업적 트리클로로에틸렌 노출과 암의 연관성-
박태원,황성호,이경무,Park, Tae Won,Hwang, Sung Ho,Lee, Kyoung-Mu 한국환경보건학회 2014 한국환경보건학회지 Vol.40 No.5
Objectives: By conducting a meta-analysis of cohort studies reporting standardized mortality ratios (SMRs) for workers exposed to trichloroethylene, we attempted to adjust for healthy hired effect by applying the same methods as described in a recent report from the Agricultural Health Study. Methods: Among all cohort studies that evaluated the association between all cancer, non-Hodgkin's lymphoma (NHL), kidney cancer, liver cancer and occupational exposure to trichloroethylene, a total of 10 studies reporting SMR values were selected. A random-effects model was used to estimate the summary SMRs or rSMRs and 95% confidence intervals. Relative SMR ($rSMR=SMR_x/SMR_{not\;x}$) was calculated comparing observed and expected counts for all cancer, NHL, kidney cancer, and liver cancer with an independent referent set of values consisting of the observed and expected counts for other causes. Results: The SMR values for all causes ranged from 0.68 to 1.03, suggesting moderate to weak healthy worker effect for the selected studies. When the healthy worker hire effect was taken into account, the summarized risk became statistically significant; the summary SMR of all cancer was 0.95 (0.91-1.00) and the summary rSMR of all cancer was 1.10 (1.04-1.15). The summary SMR of NHL was 1.04 (0.93-1.14) and the summary rSMR of NHL was 1.23 (1.04-1.46). The summary SMR of kidney cancer was 1.08 (0.88-1.33) and the summary rSMR of kidney cancer was 1.23 (1.02-1.49). The summary SMR of liver cancer was 0.88 (0.78-0.99), and the summary rSMR of liver cancer was 0.95 (0.84-1.07). Conclusion: The rSMR method is useful to determine summary risk adjusted for healthy worker effect through meta-analysis.
Cu를 함유한 HSLA-100강 용접 열영향부의 미세 조직 및 인성
박태원,심인옥,김영우,강정충 ( T . W . Park,I . O . Shim,Y . W . Kim,C . Y . Kang ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.1
A study was made to characterize the microstructures and mechanical properties of the base metal and the heat-affected zone(HAZ) in Cu-bearing HSLA-100 steel. The Gleeble thermal/mechanical simulator was used to simulated the weld HAZ. The relationship between microstructure and toughness of HAZ was studied by impact test, O.M, SEM, TEM, and DSC. The toughness requirement of military specification value was met in a.ll test temperatures for the base metal. The decrease of HAZ toughness comparing to base plate is ascribed to the coarsed-grain and the formation of bainite. Obliquely sectioned Charily specimens show that secondary crack propagate easily along bainite lath. Improved toughness(240J) at HAZ of Tp₂=950℃ is due to the fine grain, and reasonable toughness(160∼200J) in the intercritical reheated HZA is achieved by the addition of small amount of carbon which affects the formation of M-A. Cu precipitated during ageing for increasing the strength of base metal is dissolved during single thermal cycle to 1,350℃ and is precipitated little on cooling and heating during subsequent weld thermal cycle. Thus, the decrease of toughness does not occur owing to the precipitation of Cu.
800 MPa급 무예열 용접재료의 폭파변형성능에 관한 연구
박태원,송영범,김진영,박철규,김희진,Park, Tae-Won,Song, Young-Beum,Kim, Jin-Young,Park, Chul-Gyu,Kim, Hee-Jin 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.6
The Cu-bearing PFS-700 steel which has yield strength over 700 MPa was developed to replace the existing submarine structural material, HY-100. The PFS-700 steel has a combination of good mechanical properties and superior weldability. Becaus of that, it can be welded without pre-heating. The application of PFS-700 steel to submarine or battle ship will give a great reduction of cost by omitting pre-heating or lowering pre-heat temperature. To develop pre-heating free welding consumables that match and take advantage of PFS-700 steel, new welding consumables have been designed for the GMAW, SAW processes and explosion bulge test(EBT) was conducted to see the reliability of welded structure. All welds were made without pre-heating, and the inter-pass temperature was below $50^{\circ}C$ for SAW50 and $150^{\circ}C$ for GMAW and SAW150. All EBT specimens show over 14% thickness reduction without through-thickness crack or crack propagation to the hole-down area. Tensile properties for all welding conditions show higher(GMAW) or similar values(SAW50, SAW150) to the base metal. Charpy impact values for the weld metal also show 163.5J(GMAW), 95.4J(SAW50) and 69.0J(SAW150), which meet the goal(higher than 50J) of this project.