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RISS 인기검색어
- 검색키워드
- 저자 : 鄭元謨 (검색결과 88 건)
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有機金屬分子內配位化合物의 Carbonyl配位子에 關한 硏究
鄭元謨 大田開放大學 1986 論文集 Vol.5 No.-
This thesis is to study on the difinition, the sort and the Property of Organometallic Intramolecular Coordination Compounds, namely, it is to inquire into the sort by the reaction of the product, the quality of reaction, the stability of the product, and with this, stereo-structure to Organometallic Intramolecular Coordination Compounds having the latest carbonyl coordination. The product-reaction of Organometallic Intramolecular Coordination Compounds carbonyl coordination is mainly classified into direct reaction, replacement reaction, insertion reaction, addition reaction and desiccation reaction. In these reactions it is apt to produce Intramolecular coordination compounds having five member-ring structure. And these five member-ring structure is stable. Accordingly, it is difficult to act on the opening and closing reaction of ring, and with this the exchange reaction of coordination.
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Cs-137에서 나오는 베에터線에 의한 여러 特質의 沮止能測定
鄭元模 연세대학교 대학원 1972 延世論叢 Vol.9 No.1
Energy loss of K-internal conversion electron in Cs-137 penetrating various foils was measured. In this experiment, Pt, In, Mica, Cu, Au, and Ni were used for foil and Yonsei- I Double Focusing Spectrometer was used for measurement. As far as energy loss was concerned, most probable energy loss agreed more accurately with this experimental data than average energy loss.
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154Gd에서의 감마-내부전환 전자 각 상관에 관한 연구
朱寬植,全禹柱,鄭元謀 명지대학교 자연과학연구소 1985 자연과학논문집 Vol.3 No.-
??가 ??로 붕괴될 때 방출되는 전이 감마선 123 KeV의 K각과 L각 입자 매개변수를 결정하기 위하여 ?? 각 상관관계 실험을 하였다. 감마선을 측정하기 위하여 NaI(Tℓ)와 Ge(Li)검출기를 사용하였고 내부전환전자를 측정하기 위하여 표면장벽형 검출기를 사용하였다. 실험 결과, 입자 매개변수는 b₂(E2, 123K)=1.34±1.15, B2(E2, 123L)=0.88±1.11이었다. 이 값은 이론치에 비해 30% 정도의 오차를 보이고 있는데 핵구조효과가 123Ke V E2전이에 영향을 주고 있다고 생각든다. 또한 이 입자 매개변수를 이용하여 K각 내부전환계수 ακ=0.63을 구하였고 이를 기준값으로 삼아 감마선과 내부전환전자선의 세기를 비교함으로써 여러 에너지 전이의 내부전환계수를 구하였다.
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有機化合物에 있어서의 酸化反應에 對한 考察 : 特히 Ion反應의 Radical 反應에 있어서의 基礎理論에 對해서
鄭元謨 大田工業高等專門學校 1969 論文集 Vol.4 No.-
Though the quality and reaction of organic and inorganic compound must be considered as to the oxidation reaction of organic compound, and the relations between the theory of electrons, the theory of reaction construction and chemistry of solid must be explained; only partial oxidation is mentioned here. From the oxidation of the organic compound, direct oxidation-slow oxidation which is turned up by air generally in low temparature; alcohol oxidation - oxidation process of the movement of electron which shows such phenomenon as herlerolytic oxidation; and aldehyde oxidation - proper oxidation by using herterolytic oxidizing agent because the reaction proceeds rapidly that makes aromatic aldehyde like Connzzaro reaction into strong alkali - are chorea. Keton is more difficult to be oxidized than alcohol or olefine, but it is oxidized especially by saturated hydrocarbon or reagent which is not worked in alcohol. Calbonic acid is a material which is seldom oxidized but the enolization in the oxidation process of the calbonic acid is important. Because the oxidation of armatic hydrocarbon does not have any space, electrons of the whole malecules are tightly combined all together and it is not effected by oxidizing agent. So there is a means that we take advantage of the activation by light.
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여러종류의 기체를 통과한 알파-입자의 에너지 손실에 관한 연구
정원모,주관식,강인식 연세대학교 자연과학연구소 1981 學術論文集 Vol.8 No.-
알파-입자가 기체를 통과할 때, 알파-입자는 기체의 원자를 이온화 시킴으로써 에너지를 손실한다. 본 실험에서 알파-입자의 검출은 surface barrier detcctor를 사용하였는데 실험한 결과에 의하면 알파-입자의 에너지 손실은 기체의 압력에 따라 증가함을 알 수 있고, 공기에 대한 헬륨과 아르곤 기체에서의 상대저지능이 각각 0.18과 0.96이 된다는 결론을 얻었다. When Alpha particles pass through gas, energy loss occured by ionizing the atoms of gas. In this experiment, the detection of alpha particles has been measured with surface barrier detector. According to the results of experiment, the energy loss by ionization increase with pressure of gas. The relative ratios of energy losses of Helium and Argon to that of air are obtained the 0.18 and 0.96 respectively.
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임플랜트로 수복된 하악 구치부에 대합되는 자연치 주변의 골변화
정원모,김대곤,이양진,박찬진,조리라,Jung, Won-Mo,Kim, Dae-Gon,Yi, Yang-Jin,Park, Chan-Jin,Cho, Lee-Ra 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.2
Statement of problem: Alteration of tooth function is assumed to be changed by stress/strain on the adjacent alveolar bone, producing changes in morphology similar to those described for other load-bearing bones. When teeth are removed, opposing teeth will not be functioned. When edentulous area is restored by implant prostheses, opposing teeth will be received physiologic mechanical stimuli. Purpose: The aim of this study was to evaluate the bone changes around the teeth opposing implant restoration installed mandibular posterior area. Material and method: Eight patients who had mandibular posterior edentulous area were treated with implants. Radiographs of the opposing teeth were taken at implant prostheses delivery(baseline), 3 months, and 6 months later. Customized film holding device was fabricated to standardize the projection geometry for serial radiographs of opposing teeth. Direct digital image was obtained. Gray values of region of interest at each digital image were measured and compared according to time lapse. Repeated measured analysis of variance and post-hoc Scheffe's test were performed at the 95% significance level. Results: Alveolar bone changes around the natural teeth opposing the posterior implant in mandible showed statistically significant difference compared to control group(P<0.05). And gray values of alveolar bone around the teeth opposing implants were increased. There were no statistically significant differences of alveolar bone changes between crestal group and middle group and between mesial group and distal group according to time lapse(P>0.05). There were no statistically significant differences of alveolar bone changes among mesial-crestal group, mesial-middle group, distal-crestal group, distal-middle group, and control group(P>0.05). Conclusion: Alveolar bone around the natural teeth opposing the implant prosthesis showed gradual bony apposition.
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신기술 발전 추세에 부응한 무기체계 연구개발 절차 개선방안
정원모,Jeong, Won-Mo 한국방위산업진흥회 2002 國防과 技術 Vol.- No.282
우리 군도 신기술 발전 추세에 부응하여 연구개발단계 중에서 탐색개발 단곌ㄹ 통합하여 불요불급한 절차를 단축하고, 핵심기술 연구 확대 및 사전계획성능개량 의무화, 연구개발 기간을 3년 이내로 한정하는 등 체계개발을 위한 제반 여건과 방식을 개선해야 한다. 또한 DFSS의 도입 및 시험평가 제도 개선을 통한 실시간 연구관리체계를 구축하여 사업주관부서의 연구개발 통제력을 강화하고, 연구개발 예산편성 방법을 개선하여 신기술 분야 핵심기술 연구를 활성화시켜야 할 것이다.
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