• Title/Summary/Keyword: Cho Se-rae

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Application of SE Management Techniques for Space Launch System Development (우주 발사 시스템 개발에 있어서의 SE 관리기법 적용)

  • Joh, Miok;Cho, Byoung-Gyu;Oh, Bum-Seok;Park, Jeong-Joo;Cho, Gwang-Rae
    • Journal of the Korean Society of Systems Engineering
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    • v.1 no.1
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    • pp.53-60
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    • 2005
  • System engineering(SE) management techniques applied for space launch system development are introduced to assess the current status and address the effectiveness of these techniques. Management plans and guides are prepared for the work breakdown structure, data, configuration, interface control, quality assurance, procurement, reliability, risk and verification/validat ion. Further improvement is required for the system engineering management plan(SEMP) to merge the international cooperation into current engineering management system.

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A Study on Interpretation of Architectural Drawings on $Y\^{a}e\;Se\^{o}$ in the Cho-Sun Dynasty (조선시대 예서(禮書)에 나타난 건축적(建築的) 도면(圖面)의 해석(解釋)에 관한 연구)

  • Hong, Seung-Jai
    • Journal of architectural history
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    • v.1 no.2 s.2
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    • pp.52-67
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    • 1992
  • In Cho-Sun Dynasty, since Czhu-Ja Ga Rae be introduced in late Korea dynasty, many kinds of $Y\^{a}e\;Se\^{o}$ by a personal or national edition had been published, based on supports of the political ideology. Especially, in the age of governing by $'Y^{a}e'$ in 16 17c, after completion of publishing $'Oh\;R^{a}e\;Yi(1474),'$ 'Geong Guk Dae Jeon (1469)' in late 15c, norm of $'Ga\;R^{a}e'$ has prevailing and the quantity of publishment of it is more growing. Generally, the contents of these kinds of $Y^{a}e\;Se^{o}$ is intended to interprete the czhu-Ja $'Ga\;R^{a}e'$. and furthermore, some kinds of it, descripted directly architectural institutions as a part of $Y^{a}e\;J^{a}e$ through architectural drawings, with quatating chinese scholar's theory. It can be said that architectural institution on $Y^{a}e\;S^{e}o$ may be a kind of political institution as a tool for execution of a ideal ideology in Confucianism. In this Context, it can be concluded that the governing-class in Cho-Sun Dynasty refered to the architectural institution on $Y^{a}e Se^{o}$ as a ideal norm and, in constructing or organizing buildings, it was taken in account as a 'frame of reference'. The Locus of this study is on architectural drawings on $Y^{a}e\;Se^{o}$, for certifying interrelationship the institution which is executed in the drawings and the architectural characteristics of construction and organization in Cho-Sun Dynasty.

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Synthesis and Photoluminescence of Zn Complex (여러종류의 Zn Complex 합성과 PL 특성)

  • Yang, Jong-Heon;Lee, Tae-Hoon;Cho, Chong-Rae;Chung, Su-Tae;Son, Se-Mo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.1019-1021
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    • 2002
  • In place of $Alq_3$ for EL, various Zn-Complex with fluorenscent chromophores were synthesized. PL of Zn-Complex substituted with electron donor group at 2 or 4 position occurred to bathochromic shift of emission$(\lambda_{max})$ and PL intensity was weaker than Zn-Complex non-substituted with electron donor group.

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The Synthesis and EL Properties of Polycarbazole Derivatives (Polycarbazole 유도체의 합성과 EL 특성)

  • Ryu, Jung-Yi;Lee, Tae-Hoon;Cho, Chong-Rae;Chung, Su-Tae;Son, Se-Mo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.07b
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    • pp.1026-1029
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    • 2003
  • Polycarbazole derivatives have been investigated for emitting materials of PLED. We synthesized two polymers containing carbazole chromophor, which are different from bonding position. We investigated the spectra of their absorption, photoluminescence, electroluminescence.

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Anti-Ionizing Radiation Effect of Selenium on Osteoporosis Model during Bone Repair Process (골다공증 모델의 뼈 재생기에 있어 셀레늄(Selenium)의 방사선 보호작용)

  • Kim, Hyun;Cho, Sang-Rae;Choe, Changyong;Seong, Hwan-Hoo
    • Journal of Embryo Transfer
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    • v.30 no.3
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    • pp.201-206
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    • 2015
  • Selenium (Se) is an essential trace element for humans and animals, and several findings suggest that dietary Se intake may be necessary for bone health. Accumulating evidence indicates that Se compounds possess anticancer properties. Se is specifically incorporated into proteins in the form of selenocysteine and non-specifically incorporated as selenomethionine in place of methionine. This study evaluated protection by Se in the bone repair process in ovariectomized rats after irradiation. For such purpose, 80 ovariectomized female Sprague-Dawley rats were randomly divided into 4 experimental groups: ovariectomized (Ov), Ov/Se, Ov/irradiated (Irr) and Ov/ Se/Irr. A bone defect was created on the tibia of all animals 40 days after ovariectomy. Two days after surgery, only the Ov/Se and Ov/Se/Irr rats received 0.8 mg Se/kg. Three days after surgery, only the Ov/Irr and Ov/Se/Irr rats received 10 Gy of X-rays on the lower limb region. The animals were euthanized at 7, 15, 22 and 29 days after surgery to assess the repair process, which was evaluated by analysis of trabecular bone number (Masson Trichrome) and birefringence analysis (Picrosirius). It was possible to observe a delay in the bone repair process in the ovariectomized/irradiated group and similarity between the ovariectomized, Ov/ Se and Ov/Se/Irr groups. Our findings suggest that sodium selenite may influence a radioprotective effect in the bone repair of tibia of ovariectomized rats without toxicity.

5' Processing of RNA I in an Escherichia coli Strain Carrying the rnpA49 Mutation

  • Jung, Young-Hwan;Park, Jung-Won;Kim, Se-Mi;Cho, Bong-Rae;Lee, Young-Hoon
    • BMB Reports
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    • v.30 no.2
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    • pp.162-165
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    • 1997
  • RNA I. a negative controller of ColE1-type plasmid replication, is metabolized by several RNases in Escherichia coli. Two small derivatives of RNA I are accumulated at nonpermissive temperatures in an E. coli strain carrying the rnpA49 mutation, a thermosensitive mutation in the rnpA gene encoding the protein component of RNase P. A primer extension analysis was carried out to compare 5' processing of RNA I in the E. coli rnpA49 cells at both permissive and nonpermissive temperatures. Derivatives of RNA I having different 5' ends were observed in the cells grown at permissive and nonpermissive temperatures. Some of the derivatives may be generated by the cleavage of RNase P.

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Synthesis and Electron Transport of Novel Stilbenequinone(II) (Stilbenequinone의 합성과 전자 수송(II))

  • Cho, Chong-Rae;Kim, Myoung-Hwan;Yang, Jong-Heon;Kim, Beom-Jun;Chung, Su-Tae;Son, Se-Mo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.07b
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    • pp.1002-1005
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    • 2002
  • We have synthesized novel stilbenequinone derivatives(ASQ, PSQ) and investigated the properties of their electron drift mobility. Characteristics of the ionization potential Ip and electron affinity Ea of the ASQ were investigated by determining both oxidation and reduction potentials. There were estimated Ip = 7.1 eV and Ea = 3.6 eV. The electron drift mobility of ASQ mixture(R:t-Bu 10wt%) was $1.5{\times}10^{-5}cm^2/V{\cdot}sec$ at $6.15{\times}10^{5}V/cm$ and $1.3{\mu}m$ thickness.

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