골다공증 유도 백서 경골에 티타늄 임플랜트 매식 시 지방조직유래 줄기세포 주입과 저출력 초음파 적용이 골치유에 미치는 영향

이광호,최연식,신상훈,정인교,김규천,김철훈,김욱규,Lee, Kwang-Ho,Choi, Yeon-Sik,Shin, Sang-Hun,Chung, In-Kyo,Kim, Gyoo-Cheon,Kim, Cheol-Hun,Kim, Uk-Kyu 대한악안면성형재건외과학회 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.3

Purpose: Osteoporosis, is a major health problem for the elderly and post-menopausal women and shown to alter the properties of bone as well as impair bone healing around titanium implants in both human and animals. The objective of this study was to examine the effect of LIPUS with adipose-derived stem cells on the healing process around a titanium implant in rats with osteoporosis. Methods: Sixteen osteoporosis-induced rats were divided into two groups: an adipose-derived stem cell injected with Low Intensity Pulsed Ultrasound (LIPUS) application group and a control group. Titanium screw implants (diameter, 2.0 mm: length, 3.5 mm, Cowell Medi, Korea) were placed into both tibia of 16 rats, on 8 rats as the control group and the other 8 rats as the experimental group. Rats were sacrificed at different intervals from 1, 2, 4 and 8 weeks after implantation for histopathologic and immunohistochemical analyses. Results: Histopathological analysis revealed newly formed bone in experimental group earlier than that in control group. Especially at 1 week after implantation, more amounts of new bone matrix and collagen around the implant in the experimental group were seen compared with the control group. Immunohistochemical analysis showed that the levels of osteoprotegerin (OPG) expression in the experimental group were increased at early stages compared with that of control group until 2 weeks after implantation. But after 2 weeks, the expression level of OPG similar in both groups. The expression levels of receptor activator of nuclear factor kB ligand (RANKL) were stronger in the experimental group than the control group until 2 weeks after implantation. After 4 weeks, expression of RANKL in experimental group was similar to the control group. Conclusion: The results of this study suggest that LIPUS with Adipose-Derived Stem Cells in implantation could promote bone healing around titanium implants in rats with osteoporosis.

스피넬계 흑색 안료를 이용한 흑색 지르코니아 세라믹스의 제조 및 특성분석

이광호,이용석,박주석,이병하,Lee, Kwang-Ho,Lee, Yong-Seok,Park, Joo-Seok,Lee, Byung-Ha 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.4

The zirconia ceramics are widely used because of their excellent mechanical properties. Recently, many researches to make a colored zirconia was achieved to satisfy the individual aesthetic requirements. In this study, the synthesis of black-color spinel-based inorganic pigments which are stable above $1400^{\circ}C$ and the fabrication of black-colored zirconia using the synthesized pigments are investigated. Inorganic pigments which have spinel structure and near black color were synthesized by a solid state reaction method using a $Fe_2O_3,\;Cr_2O_3$, CoO and NiO powder as a starting materials at $1600^{\circ}C$. Most of synthesized pigments were black colored spinel phases and single spinel phase was successfully synthesized at the composition range of $Cr_2O_3:25{\sim}35%,\;Fe_2O_3:45{\sim}55%$, CoO:20% and NiO:$6{\sim}10%$. The black-colored zirconia was fabricated at $1410^{\circ}C$ with the 5 wt% synthesized pigments and their properties were evaluated. The results showed that the strength value was more than 848 MPa, absorption rate was 0.1%, the brightness of color was $L^*:40{\sim}42$, the tone of color is $a^*:0.2{\sim}0.8$ and $b^*:-1.1{\sim}2.4$. As a result, the black-colored zirconia was suitable for a artificial jewelry or decoration zirconia goods.

3차원 불규칙 수치파동수조(3D-NIT) 모델의 적용성에 관한 연구

이광호,백동진,김도삼,Lee, Kwang-Ho,Baek, Dong-Jin,Kim, Do-Sam 해양환경안전학회 2012 해양환경안전학회지 Vol.18 No.5

In this study, 3D-NIT(3-Dimensional Numerical Irregular wave Tank) model in which regular wave as well as stable irregular wave can be generated in 3-dimensional numerical irregular wave tank was proposed. To verify validity, the following steps need to be conducted: 1) comparative analysis between calculated waveforms and targeted waveforms at the wave generating point, 2) comparative analysis with the existing experimental values of overtopping volume estimated, targeting shore protection structures installed on a slope bed, 3) comparison with the existing numerical and hydraulic experimental results through application in the analysis on the wave deformation by structures and wave force acting on the vertical cylindrical structures. Based on the results, characteristics of the breaking wave forces according to incident waves and interval distance of structures were identified through application of 3D-NIT model in the analysis on the breaking wave forces acting on the cylindrical structures installed on a slope bed, and reflection and overtopping was reviewed through application in the special breakwaters on the domestic fields. The numerical results obtained the 3D-NIT model are in good agreement with experimental results, and its applicaion to the complex-shpaed coastal structures is verified. 본 연구에서는 3차원수치파동수조에 규칙파뿐만 아니라 안정적인 불규칙파가 조파될 수 있는 새로운 조파시스템 3D-NIT(3-Dimensional Numerical Irregular wave Tank)모델을 제안한다. 그의 타당성을 검증하기 위하여 1) 조파지점에서 계산파형과 목표파형을 비교 검토하고, 2) 경사수심역에 설치된 호안구조물을 대상으로 산정된 기존 월파량에 대한 실험치와 비교 검토하며, 3) 연직원주 구조물에 작용하는 파력 및 구조물에 의한 파랑변형의 해석에 적용하여 기존의 수치 및 수리실험결과와 비교한다. 이상의 결과를 기초로 3D-NIT모델을 경사수심역에 설치된 원주구조물에 작용하는 쇄파력의 해석에 적용하여 입사파고, 구조물의 이격거리 등에 따른 작용쇄파력의 특성을 규명하고, 더불어 국내현장의 특수방파제에 적용하여 반사율, 월파량 등을 검토하였다. 그 결과 본 연구에서 제안하는 3D-NIT모델을 이용한 수치실험결과는 기존의 수리모형실험을 잘 재현하고 있음을 확인하였고 복잡한 형상을 갖는 해안구조물의 해석에 적용할 수 있음이 확인되었다.

흑연 함침법에 의한 흑색 지르코니아의 제조 및 특성분석

이광호,안종필,박주석,이용석,이병하,Lee, Kwang-Ho,Ahn, Jong-Pil,Park, Joo-Seok,Lee, Yong-Seok,Lee, Byung-Ha 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.4

Zirconia is widely used for structural materials in machinery due to its superior properties, such as high strength, high hardness, and high toughness. Zirconia generally has ivory or white color. Therefore many studies are performed for diversification of zirconia color, in order to be widely uitilized for decoration and machine parts which need distincfive color. In this study, graphite is used to prevent structural defect, to maintain superior properties, and to develop black color of zirconia by impregnation method. As specimen was impregnated at $1600^{\circ}C$ for 2 h, bending strength is 1221 MPa, density is $6.01\;g/cm^3$, hardness is 10.1 GPa, absorption coefficient is 0%, transmittance is Fail, chromaticity is 54. The results indicate that black zirconia has enough properties to be adopted as mechanical parts. Optimum impregnation time is 2 h for various observations.

최승자 시의 애도 주체와 젠더 정치학

이광호(Lee, Kwang-Ho) 한국시학회 2016 한국시학연구 Vol.- No.45

본 논문은 최승자 초기 시에서의 ‘애도의 주체’를 분석하면서 그 미학적 특이성과 젠더 정치학의 문제를 제기하고자 한다. 최승자의 시는 애도의 주체가 ‘낳은 주체’ 즉 존재를 ‘생성’하고 ‘이행’시키는 존재가 되는 시적인 과정을 드러낸다. ‘너’와 함께 한 시간의 상실 앞에서 시적 주체는 기억을 보존하는 방식으로 ‘부재’속에 머문다. 기억은 몸에 새겨져 지워질 수 없는 것으로 재구성되고, 기억의 주체는 그 ‘주체화’의 자리에서 내려와 기억에 대해 수동적인 위치에 처하게 된다. 기억의 윤리학은 몸에 새겨진 시간을 ‘기억할 수밖에 없는’ 존재로서의 ‘이중 애도’의 주체가 된다. 기억의 주체가 ‘낳은 주체’로 전환될 때, 죽어 가는 ‘여성-몸’은 애도의 예외적인 형식을 드러낸다. 죽은 여성의 몸과 ‘사산’된 존재에 대한 애도는, ‘여성-몸’이 만드는 다른 생산의 ‘(불)가능성’으로 전환된다. 애도는 죽음을 넘어서는 ‘여성-몸’의 혁명적인 상상력과 조우한다. ‘낳는 주체’로서의 ‘여성-몸’의 잠재성은, 하나의 존재를 다른 존재로 ‘이행’시키는 것이며, 애도 주체로서의 여성 주체는 통과제의적인 장소가 된다. 최승자의 초기 시의 여성 주체는 시의 언어들 속에서 구성된 애도의 ‘수행자(遂行者)’로서의 시적 주체이다. 이 애도의 주체는 사랑과 기억의 대상을 포기하기를 거부하며, ‘죽은 몸’이 대상을 ‘다시 낳는’ 행위를 통해 대상을 ‘내’ 안에서 재생성한다. ‘낳은 주체’는 모성의 이데올로기로서의 여성을 규정하는 것이 아니라, ‘낳은 행위’ 자체를 통해 애도의 주체를 재구성한다. 정상적인 애도의 경제학이 애도를 탈정치화한다면, 최승자의 시적 주체는 제도화되고 권력화된 젠더 시스템을 파열시키고 애도를 재정치화 한다. This research aimed at re-contextualizing the problem of the esthetic specialty and gender politics while analyzing "the subject of condolence" in Choi, Seung-Ja"s early poem. Choi, Seung-Ja"s poem reveals the poetic process that becomes a being that "creates" and "transmits" the "born subject", i.e. the existence that the subject of condolence gave birth. At the loss of time with "you", poetic subject remains in "absence" in the method of preserving the memory. Memory is recomposed as something that cannot be erased by being carved in body, and the subject of memory stays in the passive position in memory by descending from the position of that "subjectivation". Ethics of memory becomes the subject of "double condolence" as the being that "cannot but remember" the time carved in body. When the subject of memory is changed to "the subject that gave birth", dying "woman-body" reveals the exceptional form of condolence. Condolences on dead woman"s body and "stillborn" being is changed to "(im)possibility" of another production and revolution that "woman-body" makes. Condolence encounters revolutionary imagination of "woman-body" beyond death. Potential of "woman-body" as "the subject that gives birth" "transmits" an existence to another one, and the woman subject as the subject of condolence becomes the place of passage offer. Woman subject in Choi, Seung-Ja"s early poem is the poetic subject as the "performer (遂行者)’ of condolence composed in poetic languages. Subject of this condolence refuses to give up the object of love and memory, and regenerate the object in "me" through the act of ‘giving birth to the object again’ of ‘dead body’. ‘Birth giving subject’ does not define woman category as the ideology of mother, but recomposes the subject of condolence through ‘birth giving act’ itself. If the economics of normal condolence ex-politicizes condolence, Choi, Seung-Ja"s poetic subject ruptures institutionalized and authorized gender system and re-politicizes condolence.

수요반응자원이 포함된 전력시장의 쿠르노 경쟁모형 해석

이광호,Lee, Kwang-Ho 대한전기학회 2017 전기학회논문지 Vol.66 No.1

In order to reduce costs of electricity energy at periods of peak demand, there has been an exponential interest in Demand Response (DR). This paper discusses the effect on the participants' behavior in response to DR. Under the assumption of perfect competition, the equilibrium point of the electricity market with DR is derived by modeling a DR curve, which is suitable for microeconomic analysis. Cournot model is used to analyze the electricity market of imperfect competition that includes strategic behavior of the generation companies. Strategic behavior with DR makes it harder to compute equilibrium point due to the non-differential function of payoff distribution. This paper presents a solution method for achieving the equilibrium point using the best response function of the strategic players. The effect of DR on the electricity market is illustrated using a test system.

전치부 치아동요에 관한 방사선학적 및 임상적 연구

이광호,김병옥,한경윤,Lee, Kwang-Ho,Kim, Byung-Ok,Han, Kyung-Yoon 대한치주과학회 1995 Journal of Periodontal & Implant Science Vol.25 No.2

Tooth mobility is one of the most important clinical parameters in examination, diagnosis, prognosis and treatment planning procedure. In order to determine the differences of tooth mobility according to radiographical bone level, clinical root length, clinical crown/root ratio, and bleeding on probing, 90 male adults with periodontal disease and 10 male adults with periodontal health($25{\sim}45$ years old) were selected through clinical examinations including occlusal relationship, probing depth, attachment level, and bleeding on probing. On the mandibular anterior teeth, standard periapical radiographs were taken, and tooth mobility was measured by Periotest(Siemens Co., Germany). The radiographic bone level of individual tooth was evaluated as coronal 1/3, middle 1/3, and apical 1/3 to anatomical root length, and clinical crown length from incisal edge to bone level and clinical root length from bone level to root apex were measured with Boley gauge, and subsquently clinical crown/root ratio was calculated. The difference of tooth mobility(Periotest value) according to radiographical bone level, clinical root length, clinical crown/root ratio, and bleeding on probing was statistically analyzed by unpaired Student t-test. Tooth mobility was significantly higher in bleeding group than non-bleeding group on probing in the teeth radiographic bone level of middle 1/3, with clinical root length longer than 6mm, and with clinical crown/root ratio over 0.3(p<0.01). But there was no statistical difference in tooth mobility between bleeding group and non-bleeding group on probing in the teeth with radiographic bone level of apical 1/3, with short clinical root length less than 5mm, and with clinical crown/root ratio under 0.2(p>0.05). The results note that the tooth mobility depends on clinical root length, clinical crown/root ratio and gingival inflammation, and in the teeth with relatively good alveolar bone support gingival inflammation is one of the most important factors that affect tooth mobility.

교통사고로 인한 요통환자의 어혈방(瘀血方) 치료효능에 관한 임상적 연구

이광호,문경숙,김태우,박현재,양승인,원승환,권기록,Lee, Kwang-ho,Mun, Kyung-suk,Kim, Tae-woo,Park, Hyun-jae,Yang, Seoung-in,Won, Seung-hwan,Kwon, Ki-rok 대한침구의학회 2004 대한침구의학회지 Vol.21 No.6

Objective : The purpose of this study is to observe the effects of Eo-Hyeol Bang(瘀血方) for the patients with low back pain due to traffic accident. Methods : Eo-Hyeol Bang based on Sa-Am Acupuncture treatment(four needle technic), consists of Taibai(SP3), Taiyuan(LU9), Quchi(LI11). In following research, 60 patients were divided into Group A and Group B of each 30 persons. Only Group A was treated with Eo-Hyeol Bang, Group B was treated with common acupuncture treatment. Results : In VAS, Group A is $5.77{\pm}1.96$ and Group B is $4.53{\pm}2.40$ (P=0.033). In Improvement index, Group A is $0.3191{\pm}0.1597$ and Group B is $0.2267{\pm}0.1297$ (P=0.017). Conclusions : As a result of each P-value, we knew that Eo-Hyeol Bang is more effective than another acupuncture technic.

중 · 근세 척법 어휘의 단위 의미 분석

이광호(Lee, Kwang-Ho),도희금(Do, Hee-Geum) 한국어문학회 2018 語文學 Vol.0 No.141

Estimation in Autoregressive Process with Non-negative Innovations

이광호,박정건,Lee, Kwang-Ho,Park, Jeong-Gun Korean Data and Information Science Society 1992 한국데이터정보과학회지 Vol.3 No.1

In this paper, we obtain the natural estimators of the coefficient parameters and propose strongly consistent estimators of the parameter in the autoregressive model of order three with non-negative innovations. It is shown that the natural estimators are also strongly consistent for the parameters. We also compare the proposed estimators with the natural estimators and the least square estimators via Monte Carlo simulation studies.