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수용액중에서 아세틸피리딘류의 해리에 미치는 온도와 압력의 영향
黃正儀,鄭在元,鄭載植 慶北大學校 1990 論文集 Vol.49 No.-
The dissociation constants of 2-, 3- and 4-acetylpyridine were measured by conductometric method in the temperature range from 15 to 40℃ and pressure up to 2,500bar. The dissociation constants of these substituted pyridines were increased as the temperature increase but decrease as the pressure. From the data thermodynamic properties were calculated and the Hammett plat were obtained. From these properties the characteristic properties of the dissociation reaction were discussed.
黃正儀,裵俊雄,鄭倧在,鄭在元,張景喜 慶北大學校 物理化學硏究所 1986 硏究論文集 Vol.7 No.-
치환나프톨류(4-Cl-1-Naphthol, 6-Br-2-Naphthol, 8-NH_2-2-Naphthol)의 해리상수를 온도(25∼40℃)와 압력(1∼2000 bar)을 변화시키면서 분광학적 방법으로 측정했다. 이들의 해리상수는 치환기가 들어가므로서 모두 감소했다. 이것은 치환기의 I-효과로서 설명이 가능했으며 또 온도와 압력이 증가하면 해리상수도 증가하였다. 이들 해리상수로부터 반응의 열역학적 성질을 계산하여 반응의 성질을 알아보았다. The dissociation constants of 4-Cl-1-naphthol, 6-Br-2-naphthol, 8-NH_2-2-naphthol in aqueous solution were measured by spectroscopic method in the temperature range from 25 to 40℃ and pressure up to 2000bar. The dissociation constants were decreased as the substituents were inserted in naphthol from 4.4×10 exp(-10) to 5.82×10 exp(-11) as chloride compound and 2.5×10 exp(-10) to 3.44×10 exp(-11) or 4.21×10 exp(-11) as bromine or amino compounds, respectively. This decrease can be explained with the I- or R-effects of substituents. From the dissociation constants various thermodynamic properties were claculated and discussed the characteristics of the dissociation reaction.
黃正儀,朴斗元,吳相午,鄭倧在,朴裕哲,郭永佑 慶北大學校 1977 論文集 Vol.23 No.-
金屬실리콘과 鹽化메틸을 鹽化第一구리를 觸媒로 하여 메틸실란을 合成하고 메틸실란을 加水分解하여 실록산의 被膜을 만드는 方法을 調査하였다. 이들 被膜이 文化財 保護被膜이 될 수 있는가를 檢討하기 爲해서 材料를 文化財의 材質인 몇 가지 物質에 適用하여 膜의 性能을 調査하였다. 特히 撥水效果, 汲水量 耐久性等을 調査하였으며 外觀上 아무런 變化가 없는 좋은 被膜이 될수 있다는 結果를 얻었다. The organohalogensilicone was synthesized metal silicone and methylchloride applying the direct synthetic method using copperous chloride as catalyzer. The synthesized organosilane was hydrolyzed to siloxane by various method and coated on various materials which are composed of the cultural assets. The coating film was examined to decide whether it is profitable one to protect the assets from efflorescence or air pollution. Referring to the water repellency, permiability of water and the weather test of the film it was qualified that this film was good enough to apply to the cultural assets as protecting film.
황정의,정재원,장경희 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-
The dissociation constants of 2, 3-, 2, 4-, 2, 5-and 3, 5-dimethylpyridine were measured by conductometric method at various temperatures (15∼40℃) and pressures (1∼2500 bar) in aqueous solution. The shift of dissociation constants of methylptridines from pyridine were explained by the I-effect and cooperative effect of the methyl groups. From the dissociation constants various thermodynamic properties were calculated and discussed the characteristics of the dissociation reactions.
Comparative analysis of carrier systems for delivering bone morphogenetic proteins
Jung, Im-Hee,Lim, Hyun-Chang,Lee, Eun-Ung,Lee, Jung-Seok,Jung, Ui-Won,Choi, Seong-Ho Korean Academy of Periodontology 2015 Journal of Periodontal & Implant Science Vol.45 No.4
Purpose: The objective of this study was to comparatively assess the bone regenerative capacity of absorbable collagen sponge (ACS), biphasic calcium phosphate block (BCP) and collagenated biphasic calcium phosphate (CBCP) loaded with a low dose of recombinant human bone morphogenetic protein-2 (rhBMP-2). Methods: The CBCP was characterized by X-ray diffraction and scanning electron microscopy. In rabbit calvaria, four circular 8-mm-diameter defects were created and assigned to one of four groups: (1) blood-filled group (control), (2) rhBMP-2-soaked absorbable collagen sponge (0.05 mg/mL, 0.1 mL; CS group), (3) rhBMP-2-loaded BCP (BCP group), or (4) rhBMP-2-loaded CBCP (CBCP group). The animals were sacrificed either 2 weeks or 8 weeks postoperatively. Histological and histomorphometric analyses were performed. Results: The CBCP showed web-like collagen fibrils on and between particles. Greater dimensional stability was observed in the BCP and CBCP groups than in the control and the CS groups at 2 and 8 weeks. The new bone formation was significantly greater in the BCP and CBCP groups than in the control and CS groups at 2 weeks, but did not significantly differ among the four groups at 8 week. The CBCP group exhibited more new bone formation in the intergranular space and in the center of the defect compared to the BCP group at 2 weeks, but a similar histologic appearance was observed in both groups at 8 weeks. Conclusions: The dose of rhBMP-2 in the present study enhanced bone regeneration in the early healing period when loaded on BCP and CBCP in rabbit calvarial defects.
Histologic Observation of Soft Tissue Acquired From Maxillary Tuberosity Area for Root Coverage
Jung, Ui-Won,Um, Yoo-Jung,Choi, Seong-Ho Wiley (John WileySons) 2008 Journal of periodontology Vol.79 No.5
<P>BACKGROUND: The palatal area has been the major donor site for obtaining connective tissue for root-coverage procedures. This study evaluated the long-term outcome of using a gingival cuff from the maxillary tuberosity area as a donor site for root coverage procedures. METHODS: Case 1: A 26-year-old female patient complaining of tooth hypersensitivity and gingival recession on the maxillary left canine was treated with root coverage using a pouch technique. A connective tissue graft was obtained from the gingival cuff of the maxillary tuberosity area. An additional gingivectomy was performed at 3 months after surgery to trim the bulk of the grafted tissue. Regular recall check-up visits, including oral hygiene maintenance, occurred every 6 months. The patient was followed for 35 months after surgery. Case 2: A 24-year-old female patient with a chief complaint of tooth hypersensitivity and multiple areas of gingival recession in the maxilla was treated with a pouch and semilunar technique. The patient was treated with the same surgical protocol as in case 1. The patient was followed for 31 months after surgery. RESULTS: Full coverage was achieved in both cases with uneventful healing. The gingival biotype changed from a thin scalloped biotype to a thick flat biotype, and the overall color match was successful. The histologic findings of case 1 revealed good adaptation of the grafted tissue with continuous epithelial lining into the recipient site. The grafted tissue remained consistently stable with no change in the probing depths. CONCLUSION: The long-term evaluation of root coverage with a gingival cuff of the maxillary tuberosity area showed it to be an easier method than obtaining the graft from palatal masticatory mucosa, with a highly predictable prognosis.</P>