Hydroxyapatite/Titania Hybrid Coatings on Titanium by Sol-Gel Process

임기형,김광만,김민철,강동국,김경남,이용근 한국생체재료학회 2006 생체재료학회지 Vol.10 No.4

Sol-gel thin films of hydroxyapatite and titania have received a great deal of attention in the area of bioactive surface modification of titanium implants. Sol-gel process offers lots of advantages over other coating techniques, e.g. increased homogeneity due to atomic level mixing; finer grain microstructure and lower temperature of the crystallization. In this study, we fabricated hydroxyapatite/titania hybrid coatings on titanium by sol-gel method to combine advantages of both materials: the adhesion strength of the titanium dioxide on the substrate and the bioactivity of the hydroxyapatite. Sol-gel coatings of pure hydroxyapatite and titania, and four hydroxyapatite composites with 10~70 mol% titania were developed on titanium substrates. The characteristics of coatings, such as crystallinity, roughness and composition of surface, were observed. The composite coatings showed the characteristic peaks of pure hydroxyapatite and titania with anatase and rutile structures. When the titania amounts adding into the hydroxyapatite sol increased, the surface of the composite coatings became slightly rougher. The critical load strength between coating and substrate slightly increased to 3.151, 4.168, and 5.389 N when the amount of titania added into hydroxyapatite sol increased to 30, 50, and 70 mol%, respectively. For bioactivity test, calcium phosphate deposits were observed on the film surfaces after the soaking in SBF for 1 week, except of titania coated-substrate. The in vitro cellular responses to the coatings were assessed in terms of cell attachment and proliferation. Hydroxyapatite composite coating with 70 mol% titania had the most excellent attachment of MG63 cells as cells tend to attach more readily to surfaces with a rougher microtopography. Statistically analysis revealed that there were no significant differences between the proliferation of osteoblastic cells on the various materials (p>0.05).

노오트 특기할 한국산 약용식물

임기형(Ki Hung Rim) 대한약학회 1959 약학회지 Vol.4 No.1

At present day there are many kinds of (1) Hwang-Jung (2) Hwang-gi (3) Song-nak (4) Bun backcho (5) Chun-kulcho (6) Po-whang in Korea. Those origins are said as follows; (1) Polygonatum tenophyllum Maxi-mowicz, Polygonatum Sabiricum-Redoute (2) Astragalus msembranaceus Bunge,, A.membranaceus Bunge var. alpinus Nakai., A Henry Oliver (3) Usnea diffracta W., U. longissima (L.) Ach. (4) Potentilla Chinensis Scringe, P.C.S. var. Concolor Franchet etc. (5) Lytlirum Saricaria L. var. Vulgare DC., Lythrum Saricaria L., L. anceps (Koehne) Makino. (6) Typha angustata B. et C., T. latifolia L., T. Orientalis P., T. Davidiana Haudel-Mazzetti., T. latifolia L.XJ,T. angustata.B. et C.

털분지 Pterygopleurum Neurophyllum KITAGAWA의 생약학적연구

임기형(Ki Hung Rim),정보섭(Bo Sup Chung) 대한약학회 1966 약학회지 Vol.10 No.2

Pterygoeurum Neurophyllum KITAGAWA was a kind of new recorded perennial herbs in Korea; The roots are consisted of two parts, mother tuber and daughter tuber. There are characteristic deferences in histological structure between mother tuber and daughter tuber.

항생제를 함유한 키토산 차단막의 물리적 특성 및 약물 방출 거동

임기형(Ki-Hyeong Im),김경남(Kyoung-Nam Kim),김광만(Kwang-Mahn Kim),최성호(Seong-Ho Choi),민우기(Woo-Ki Min),이수복(Soo-Bok Lee),정용식(Yong-Sik Chung),이용근(Yong-Keun Lee) 대한치과재료학회 2005 대한치과재료학회지 Vol.32 No.2

한국산다년생약용식물에 대하여

임기형(Ki Hung Rim),정보섭(Boh Sub Chung) 대한약학회 1959 약학회지 Vol.4 No.1

I) Bupleurum (1)In oder to study on the histological review, we have devided into two types of all Bupleurum species of Korean products 1) Rhizoma type 2) root type and we selected one, B. leveilei (Jae-ju-Do) and B., latislimum(Ul-Nung-Do) is Compared with each others as shown in figures. Gentiana Uchiyamana Nakai We have studied about the classifical seats of this Gentiana Uchiyamana Nakai. and compared with Gentiana sebra Bunge. Lysimachia Barystachys Bunge Also has been studied about the classifical, echological steats, and we now decided the relation of this all species each others.

불계속성 다년생식물에 대하여 (제1보)

임기형(Ki Hung Rim) 대한약학회 1960 약학회지 Vol.5 No.1

A new suggestion on the classification of perennial herb into two types-1) Continuous perennial herb and 2) uncontinuous perennial herb is described, and the catalogue of uncontinous herbs in Korea is shown.

항상제를 함유한 생분해성 고분자/HA 복합 마이크로 입자로 구성된 주입형 골대체재

이세호,오영일,임기형,이덕연,김경남,김광만,이용근 대한치과재료학회 2006 대한치과기재학회 학술대회 Vol.2006 No.11

Quantifying Visual Specular Gloss Scale

곽영신,박현진,임기형 한국색채학회 2011 한국색채학회 논문집 Vol.25 No.3

Current state-of-art color-difference equations for color quality control are developed mainly for matte surfaces without any gloss or textures. However, most of the home appliances or electrical devices available today have glossy appearance limiting the accuracy of surface color difference prediction. Therefore new visual appearance model development will be the next goal for the color scientists including not only the color but also other surface appearances such as gloss or texture. In this study, as a first step of surface appearance model development, the relationship between the perceived gloss and the measured gloss were investigated. Two sets glossiness data were obtained for the polycarbonate (PC) surfaces with the different levels of UV clear coating. The frist set came from the eleven black and white samples with different gloss levels and the second data set was collected using twenty one black and white samples. The samples were shown in the viewing booth illuminated with D65 simulator and the observers were asked to scale the perceived glossiness between 0 and 100 for black and white samples. Around ten observers participated each experiment. The experimental results showed that the observers can judge a glossiness of a sample consistently regardless the gloss level of the neighboring samples displayed together. It suggests that glossiness is an intrinsic and absolute visual attribute people use to judge the surface appearance. Also it is confirmed that black samples look glossier than white samples having the same physical gloss value. The experimental data in this study could be used to develop mathematical glossiness prediction model.

Aconitum Uchiyamai Nakai var. albiflorum Chung et Rim 에 대하여

정태현(Tai Hyeun Chung),임기형(Ki Heung Rim) 대한약학회 1968 약학회지 Vol.12 No.1,2

Aconitum Uchiyamai NAKAI, "geu-neul-dol-che-gi"(Ranunculaceae), is geographically distributed only in Korea. An aconite collected at Mt. Dukwoo, Kangwon-Do flowers with white colour in October. The aconite is different from Aconitum Uchiyamai NAKAI from the point of anatomical and morphological views in transplanted and collected aconites. Being a new variety of Aconitum Uchiyamai NAKAI, this aconite is anounced under the name of Aconitum Uchiyamai NAKAI var. albiflorum CHUNG et RIM, "Hin-geu-neul-dol-che-gi" called in Korea. Aconitum Uchiyamai NAKAI var. albiflorum CHUNG et RIM Differt a planta Aconitum Uchiyamai NAKAI per colorem album.

Quantifying Visual Specular Gloss Scale

Youngshin Kwak(곽영신),Hyun Jin Park(박현진),Ki-Hyeong Im(임기형) 한국색채학회 2011 한국색채학회 논문집 Vol.25 No.3

현재 시중에 판매되는 대부분 전자 제품의 표면은 광택이 높은 편이나, 색 품질 관리를 위해 사용하는 색차식들은 대부분 광택이나 테스쳐가 없는 평면에 표현된 색을 이용하여 개발된 것들로 기존의 색차식을 이용하여 광택이 있는 제품의 색관리를 하는 데 한계가 발생한다. 이 때문에 색채과학 분야에서는 색 뿐 아니라 광택이나 텍스쳐까지 정량화가 가능한 시감 예측 모델에 관한 연구가 큰 관심을 받고 있다. 본 연구에서는 시감 예측 모델 개발을 위한 첫 단계로 우선적으로 측정된 광택과 인지된 시감 광택간의 상관관계를 조사하였다. 다양한 수준으로 UV 코팅된 폴리카보네이트 샘플들을 이용하여 두 세트의 광택 실험 데이터를 수집하였다. 첫 번째 세트는 11 단계의 서로 다른 광택을 갖는 흰색 및 검정색 샘플들로, 두 번째 세트는 21 단계의 흰색 및 검정색 샘플들로 구성되었다. 샘플들을 D65 광원이 켜진 관측 상자 안에 제시한 후 관찰자들에게 0에서 100 사이의 값으로 인지된 광택 정도를 대답하게 하였다. 각 실험에는 10명 내외의 관찰자들이 참여하였다. 실험 데이터 분석 결과 인지된 광택 정도는 실험 시 함께 제시된 주변 샘플들의 광택정도에 상관없이 일정하게 나타났다. 이는 시각적으로 인지되는 광택은 물리적으로 정의되는 표면에서 발생하는 정반사 정도가 아니라 사람들이 표면 특성을 인지하는데 이용하는 시각 정보로 표면 고유의 절대적인 특성인 것으로 판단된다. 또한 물리적으로 동일한 광택값을 갖는 샘플이다 하더라도 검정색 샘플이 흰색 샘플보다 더 광택이 높아 보이는 것으로 나타났다. 본 연구에서 얻어진 시감 광택 데이터는 향후 광택 예측 모델 개발 등에 활용될 수 있을 것이다. Current state-of-art color-difference equations for color quality control are developed mainly for matte surfaces without any gloss or textures. However, most of the home appliances or electrical devices available today have glossy appearance limiting the accuracy of surface color difference prediction. Therefore new visual appearance model development will be the next goal for the color scientists including not only the color but also other surface appearances such as gloss or texture. In this study, as a first step of surface appearance model development, the relationship between the perceived gloss and the measured gloss were investigated. Two sets glossiness data were obtained for the polycarbonate (PC) surfaces with the different levels of UV clear coating. The frist set came from the eleven black and white samples with different gloss levels and the second data set was collected using twenty one black and white samples. The samples were shown in the viewing booth illuminated with D65 simulator and the observers were asked to scale the perceived glossiness between 0 and 100 for black and white samples. Around ten observers participated each experiment. The experimental results showed that the observers can judge a glossiness of a sample consistently regardless the gloss level of the neighboring samples displayed together. It suggests that glossiness is an intrinsic and absolute visual attribute people use to judge the surface appearance. Also it is confirmed that black samples look glossier than white samples having the same physical gloss value. The experimental data in this study could be used to develop mathematical glossiness prediction model.