• 제목/요약/키워드: Tai chi

검색결과 204건 처리시간 0.035초

원자력발전소 건설 리드타임의 변화가 투자프로젝트 평가에 미치는 효과분석: 발전소 건설비용과 리드타임 간의 상쇄효과분석 (An Effect Analysis of Lead Time Changes on Investment Evaluation of a Nuclear Power Plant Construction : A Trade-Off Analysis Between a Construction Cost and Lead Time)

  • 김규태;이병국;오치재
    • 산업공학
    • /
    • 제12권3호
    • /
    • pp.414-423
    • /
    • 1999
  • A nuclear power plant requires a huge amount of initial investment and long construction lead time. As we expect that there may exist a relationship between investment and construction lead time, a number of researchers have reported that nearly a half of investments is incurred due to time factors such as the time value of money and inflation or escalation rates. Therefore, we investigated in this paper a relationship between the initial investment and the construction lead time of a nuclear power plant construction, and proposed a method for a trade-off analysis between the annual equivalent worth and the investment alternatives to reduce the construction lead time. Finally, we presented a real case to numerically explain the steps of the method presented in this paper.

  • PDF

Effect of additives on luminescence properties of long-persistence phosphor $SrAl_2O_4:Eu^{2+}$,$Dy^{3+}$

  • Han, Sang-Do;Singh, Krishan.C.;Gwak, Ji-Hye;Cho, Tai-Yeon;Kim, Jung-Duk;Han, Chi-Hwan
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
    • /
    • pp.1512-1514
    • /
    • 2007
  • Long afterglow $SrAl_2O_4:Eu^{2+}$,$Dy^{3+}$ is synthesized by a solid state reaction. The effect of flux $B_2O_3$ on the sintering dynamic process, the optimum concentrations of $Eu^{2+}$ and $Dy^{3+}$ for long lasting bright luminescence property and the effect of charge compensators like $Mg^{2+}$, $Zn^{2+}$, $Na^+$, $K^+$ on long persistence have been investigated.

  • PDF

Effect of heat treatment condition on optical properties of ZnS:Mn,Cu,Cl phosphor

  • Lee, Hak-Soo;Cho, Tai-Yeon;Gwak, Ji-Hye;Han, Sang-Do;Han, Chi-Hwan;Park, Sang-Hyun;Chun, Il-Su
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
    • /
    • pp.1534-1536
    • /
    • 2007
  • ZnS-based orange-emitting phosphors were synthesized by two-step firing process: above $1000^{\circ}C$ to obtain hexagonal phase, and at $750^{\circ}C$ for cubic phase. The effect of heat treatment condition on the optical properties was investigated to fine an optimum condition for high-performance ZnS:Mn,Cu,Cl phosphor.

  • PDF

Effect of Cu concentration on the luminescence of ZnS:Cu,Cl blue-green phosphor

  • Cho, Tai-Yeon;Lee, Hak-Soo;Han, Sang-Do;Gwak, Ji-Hye;Shin, Dong-Hyuk;Han, Chi-Hwan
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권2호
    • /
    • pp.1537-1538
    • /
    • 2007
  • ZnS:Cu,Cl phosphor was synthesized by solid-liquid state reaction with two firing steps. Each stage of the process was carefully monitored so that the final product was comparable to commercially-available phosphor. The effect of $Cu^{2+}-doping$ concentration has been investigated on the luminescence characteristics of ZnS:Cu,Cl blue-green phosphors for inorganic electroluminescent device.

  • PDF

충북지역 중학교시설의 친환경인증 사례연구 (A Case Study on the Middle Schools with a Environment-Friendly Certification in Chungbuk Area)

  • 정유근;김치교;김정태
    • KIEAE Journal
    • /
    • 제11권1호
    • /
    • pp.57-62
    • /
    • 2011
  • The study aims to analyze and evaluate the evaluation items and application methods of environment-friendly middle schools in Chungbuk area by case studies. For the study, the criteria and situations of environment-friendly schools are analyzed literally and three environment-friendly middle schools in Chungbuk area selected. The field surveys and faculty interviews are performed. As results, about 35 environment-friendly technologies are applied and 66 to 68 points are acquired in three selected schools. It is analyzed that the PV, natural interior materials, raining recycle system and sufficient green spaces are pointed out as main technologies. About 66% of respondents know the environment-friendly certification and use the environment facilities in classes. However, the unsuitable plants for interior green spaces, unskilled management of recycling facilities and the absent of student participate programs show up as main problems. Also, the active campaigns need to expand the environment-friendly school.

Method and Apparatus for Digital Auto Convergence of Projection Video Display

  • Tai, Wen-Chih;Mo, Chi-Neng;Juan, Chang-Jung;Tsai, Ming-Jong
    • 한국정보디스플레이학회:학술대회논문집
    • /
    • 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
    • /
    • pp.1171-1174
    • /
    • 2005
  • This thesis provides a new digital convergence method and apparatus which uses area photo sensor and new analog to digital algorithmic to identify the correct digital pattern position factor of the projection system. This method and apparatus can be applied to the convergence correction in a TV receiver with a display that comprises a display screen with photo sensors positioned adjacent to screen edges. It also can be applied to the manufacture process detection of the projection system to adjust the associative convergence parameter. In this paper, demonstrate how this convergence detecting algorithmic was implemented with four area photo sensors of special designed pattern to the rear projection CRT TV.

  • PDF

감육 배관의 손상모드에 미치는 감육부 길이의 영향 (Effects of Thinning Length on Failure Mode of Local Wall Thinned Pipe)

  • 김진원;박치용;이성호;강태경
    • 대한기계학회:학술대회논문집
    • /
    • 대한기계학회 2001년도 춘계학술대회논문집A
    • /
    • pp.357-362
    • /
    • 2001
  • The pipe fracture tests were performed on 102mm-Sch.80 carbon steel pipe with various local wall thinning shapes, in order to understand failure behavior of thinned pipe. Pipe specimens were subjected to monotonic bending moment, using 4-points loading system, under internally pressurized condition. From the results of experiment, the failure mode, load carrying capacity, and deformability of local wall thinning pipe were investigated. Failure mode of thinned pipe depended on magnitude of internal pressure and thinning length as well as loading direction and thinning depth and angle. The variation in load carrying capacity and deformability of thinned pipe with length of thinned area was determined by stress type appled to thinning region and circumferential thinning angle. Also, the effect of internal pressure on failure behavior was dependent on failure mode of thinned pipe, and it promoted crack occurrence and mitigated local buckling at thinned area.

  • PDF

도로교 비점오염원의 저감용 소형장치 (Small Device for Reduction of Non-Point Pollution in Road Bridge)

  • 김치곤;박창순;김길태;이효원;김시철;이종석
    • 한국콘텐츠학회:학술대회논문집
    • /
    • 한국콘텐츠학회 2014년도 추계 종합학술대회 논문집
    • /
    • pp.131-132
    • /
    • 2014
  • 본 논문은 도로에 설치된 교량 및 사람들의 친수 공간 내 접근성을 필요로 하는 곳에 설치되는 확장형 인도교에서 발생되는 비점오염원을 중점적으로 경감시키기 위한 소규모 저감장치의 실험적 연구이다. 이는 강수에 의한 오염물질의 장치 내 유입 침전 흡착 여과를 통해 수질을 정화 배수시키는 공정으로 이루어진다. 소형 장치에 대한 성능과 제거 효율 및 통수능 실험은 BOD, COD, 부유물질, T-N, T-P 등 5개 항목에 대해 분석하였으며, 이들 모든 항목에서 현저히 감소하는 것으로 나타났다.

  • PDF

<상한론(傷寒論)> 판본별 문장비교를 통한 표준 텍스트 연구;태양병(太陽病) 상편(上篇) (1-30조(條)) (Studies on Foundation for Standard <Shanghan Lun> Text through Comparison of Sentences from 5 Types of Printed Book)

  • 지규용;엄현섭
    • 동의생리병리학회지
    • /
    • 제22권1호
    • /
    • pp.25-31
    • /
    • 2008
  • This paper is written for foundation of standard <Shanghan Lun> text to research febrile disease referring from <Jin-gui-yu-han-jing>, Kang-ping-ben, Tang-ben, Song-ben and supplementarily Gui-lin-gu-ben. Through the comparative and analytical investigation of 30 articles of ${\ulcorner}$Taiyang bing Volume 1${\lrcorner}$, 22 articles were newly compiled after getting rid of doubtful sentences or putting together. Also, one article, "wind damage of Tai-yang give rise to fever and chilling", was added from Tang-ben. And many articles were unchanged or in some case, collected together with relevant articles to make sense more.