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정종혁,이병하,Jung, Jong-Hyuk,Lee, Byung-Ha 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.4
The objective of the present research is to develop the body for Temmoku Teabowl, in order to manufacture the Temmoku Teabowl with the characteristics of Jian Ware, which has a rich dark brown color and has been extolled as the representative fine article of Temmoku Teabowl. Basic composition was first determined using domestically produced clay, kaolin and pottery stone as starting materials. After the addition of calcinated Hwangto, which is rich in iron, the mixture was subjected either to oxidizing calcination at $1260^{\circ}C$ to produce a body with a color suitable for Hanam ware or to reducing calcination at $1230^{\circ}C$ to produce a body with a color suitable for Jian Ware. The bodies produced in this research showed the strength value of $380{\sim}36\;Kg/cm^2$, the specific gravity of 2.304~2.310, the absorption ratio of 4.103~3.897, and the porosity of 8.608~8.207%.
기술노트 : 조류를 이용한 수계모니터링 시스템에서 뉴럴 네트워크에 의한 실시간 독성물질 판단
정종혁 ( Jong Hyuk Jung ),정하규 ( Ha Kyu Jung ),권원태 ( Won Tae Kwon ) 한국물환경학회 ( 구 한국수질보전학회 ) 2008 한국물환경학회지 Vol.24 No.1
Biological and chemical sensors are the two most frequently used sensors to monitor the water resource. Chemical sensor is very accurate to pick up the types and to measure the concentration of the chemical substance. Drawback is that it works for just one type of chemical substance. Therefore a lot of expensive monitoring system needs to be installed to determine the safeness of the water, which costs too much expense. Biological sensor, on the contrary, can judge the degree of pollution of the water with just one monitoring system. However, it is not easy to figure out the type of contaminant with a biological sensor. In this study, an endeavor is made to identify the toxicant in the water using the shape of the chlorophyll fluorescence induction curve (FIC) from a biological monitoring system. Wem-tox values are calculated from the amount of flourescence of contaminated and reference water. Curve fitting is executed to find the representative curve of the raw data of Wem-tox values. Then the curves are digitalized at the same interval to train the neural network model. Taguchi method is used to optimize the neural network model parameters. The optimized model shows a good capacity to figure out the toxicant from FIC.
표면처리 시간에 따른 임플란트 미세구조의 변화;SLA와 TB 표면 임플란트
우정아,허익,권영혁,박준봉,정종혁,Woo, Jung-A,Herr, Yeek,Kwon, Young-Hyuk,Park, Joon-Bong,Chung, Jong-Hyuk 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.4
Mechanical and chemical methods are the two ways to treat the implant surfaces. By using mechanical method, it is difficult to eliminate bacteria and by-products from the rough implant surface and it can also cause the structural change to the implant surface. Therefore, chemical method is widely used in order to preserve and detoxicate the implant surface more effectively. The purpose of this study is to evaluate the effect of tetracylcline- HCl on the change of implant surface microstructure according to application time. Implants with pure titanium machined surface, SLA surface and $TiO_2blasted$ surface were used in this study. Implant surface was rubbed with sponge soaked in 50mg/ml tetracycline - HCl solution for $\frac{1}{2}$ min., 1min., $1\frac{1}{2}$ min., 2 min., and $2\frac{1}{2}min.$ respectively in the test group and with no treatment in the control group. The sponge was soaked in every 30 seconds. Then, the specimens were processed for scanning electron microscopic observation. Based upon the analysis of photographs by three dentists who are not related with this study, the results were obtained as follows; 1. In the pure titanium machined surfaces, the control specimen showed a more or less rough machined surface composed of alternating positive and negative lines corresponding to grooves and ridges. After treatment, machining line was more pronounced for the control specimens. but in general, test specimens were similar to control. 2. In the SLA surfaces, the control specimen showed that the macro roughness was achieved by large-grit sandblasting. Subsequently, the acid-etching process created the micro roughness, which thus was superimposed on the macro roughness. Irrespective of the application time of 50mg/ml tetracycline - HCl solution, in general, test specimens were similar to control. 3. In the $TiO_2blasted$ surfaces, the control specimen showed the rough surface With small pits. The irregularity of the $TiO_2blasted$ surfaces with 50mg/ml tetracycline - HCl solution was lessened and the flattened areas got wider after 1 minute.
정하규(Ha Kyu Jung),정종혁(Jong Hyuk Jung),이현욱(Hyun Wook Lee),권원태(Won Tae Kwon),김상길(Sang Gil Kim),전숙례(Sook Lye Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
Water resource can be examined using biological sensors. Algae has been one of the biological sensors used to evaluate and monitor the water pollution. The monitoring system, however, could determine whether the examined water was safe or not. It needs additional expensive chemical test to figure out the cause of the water pollution. In this study, an endeavor is given to identify the toxicant in the water using the shape of the chlorophyll fluorescence induction curve(FIC) from algae using monitoring system. Fundamental curves are obtained from the experiments with specified amount of toxicant. Baysian method is utilized to determine the unknown toxicant in the water by comparing it with the fundamental curves. The results shows that the proposed method works fairly well.
지각과민증에 대한 미세결정형 수산화인회석 함유 치약의 임상적 효과
박정주,박준봉,권영혁,허익,정종혁,Park, Jung-Ju,Park, Joon-Bong,Kwon, Young-Hyuk,Herr, Yeek,Chung, Jong-Hyuk 대한치주과학회 2005 Journal of Periodontal & Implant Science Vol.35 No.3
The purpose of this study was to evaluate the effects of toothpaste containing hydroxyapatite for patients who complained dental hypersensitivity. Before baseline of application of toothpaste with hydroxyapatite, tooth brushing instruction was done respectively and the several indices were measured at baseline, 2, 4, 8 weeks. Clinical indices were estimated, and responses to cold, compressive air, tactile stimulus were evaluated with verbal rating score. Relief effects and visual analogue scale were also evaluated. The results of this study were as follows 1. The occurrence rate of hypersensitivity in upper jaw was higher than that of lower jaws, and molar area showed more hypersensitivity than premolar and incisor area. Buccal site was hypersensitive followed by interproximal and lingual site. 2. Plaque index, gingival index and probing depth reduction were gradually improved after Tooth Brushing Instruction and using toothpaste. 3. Subjects showed most sensitive response to cold stimuli than compressive air and tactile stimuli. 4. The relief effect was increased during using tooth paste and complete relief was increased especially at 8 weeks. 5. Visual analogue scale was increased. In conclusion, it was confirmed that toothpaste containing microcrystalline hydroxyapatite have the relief effect of tooth hypersensitivity. During 8 weeks, stimulus responses were decreased and hypersensitivity relief effect was increased.
천공형 티타늄 막의 조기 노출이 수직 골 형성에 미치는 영향
김은정,허익,권영혁,박준봉,정종혁,Kim, Eun-Jung,Herr, Yeek,Kwon, Young-Hyuk,Park, Joon-Bong,Chung, Jong-Hyuk 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.2
This study was performed to evaluate the effect of membrane exposure on new bone formation when guided bone regeneration with perforated titanium membrane on atrophic alveolar ridge. The present study attempted to establish a GBR model for four adult beagle dog premolar. Intra-marrow penetration defects were created on the alveolar ridge(twelve weeks after extraction) on the mandibular premolar teeth in the beagle dogs. Space providing perforated titanium membrane with various graft material were implanted to provide for GBR. The graft material were demineralized bovine bone(DBB), Irradiated cancellous bone(ICB) and demineralized human bone powder(DFDB). The gingival flap were advanced to cover the membranes and sutured. Seven sites experienced wound failure within 2-3weeks postsurgery resulting in membrane exposure. The animals were euthanized at 4 weeks postsurgery for histologic and histometric analysis. The results of this study were as follows: 1. There was little new bone formation at 4 weeks postsurgery. irrespectively of membrane exposure. 2. There was significant relationship between membrane exposure and bone graft resorption(P<0.05), but no relation between membrane exposure and infiltrated connective tissue. 3. There was much bone graft resorption on DFDB than ICB and DBB. 4. The less exposure was on the perforated titanium membrane, the more dense infiltrated connective tissue was filled under the membrane when grafted with ICB and DBB. but there was no relationship between the rate of membrane exposure and the percentage of infiltrated connective tissue area and no relationship between the percentage of the area in the infiltrated connective tissue and in the residual bone graft. Within the above results, bone formation may be inhibited when membrane was exposed and ICB and DBB were more effective than DFDB as a bone graft material when guided bone regeneration.
산화 티타늄 블라스팅 임프란트 표면구조에 대한 염산 테트라싸이클린의 영향
이정민,허익,권영혁,박준봉,정종혁,허성주,Lee, Jung-Min,Herr, Yeek,Kwon, Young-Hyuk,Park, Joon-Bong,Chung, Jong-Hyuk,Heo, Seong-Joo 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.3
The present study was performed to evaluate the surface roughness and effect of Tetracycline-HCI on the change of implant surface microstructure according to application time. Ti$O_2$ surface Implant was utilized. Implant surface was rubbed with 50mg/ml Tetracycline-HCI solution for 0.5min, 1min, 1.5min, 2min, 2.5min and 3min respectively in the Tetracycline-HCI group. Then, specimens were measured surface roughness and processed for scanning electron microscopic observation. The results of this study were as follows. 1. Ti$O_2$ blast implant surface showed increased surface roughness 1.5 minute after treatment with Tetracycline-HCI. But, there were not significant differences in saline group after treatment. 2. Tetracycline-HCI group showed changed surface micro-morphology in SEM after 1.5 minute. There were not significant differences in saline group after treatment. 3. Between Tetracycline-HCI group and saline group, there were difference in surface roughness change and SEM micro-morphology. Tetracycline-HCI have influence on Ti$O_2$ blast implant surface. In conclusion, the detoxification with 50mg/ml Tetracycline-HCI must be applied respectively with different time according to various implant surfaces.
860 MHz 대역 고출력 Cartesian 피드백 송신기 설계
김민수,조한진,안건현,정성찬,박현철,반주호,정종혁,권성욱,임경훈,송성찬,김재영,양영구,Kim, Min-Su,Cho, Han-Jin,Ahn, Gun-Hyun,Jung, Sung-Chan,Park, Hyun-Chul,Van, Ju-Ho,Jeong, Jong-Hyuk,Kwon, Sung-Wook,Lim, Kyung-Hoon,Song, Sung-Chan,Klm, 한국전자파학회 2007 한국전자파학회논문지 Vol.18 No.2
This paper presents the design of 860 MHz band transmitter for improving power amplifier's linearity using Cartesian feedback method. For eliminating the effects of gain, phase mis-match, and DC offset, we estimate the property variations using ADS software. The implemented Cartesian feedback transmitter exhibits IMD3 of -54 dBc at an output power of 43 dBm and this result shows that the linearity is improved for 22.4 dB, compared with the test of the power amplifier without Cartesian feedback system. Thus, we verify that the proposed Cartesian feedback transmitter can be applied to narrow-band transmitter systems. 본 논문은 Cartesian 피드백 방법을 이용하여 전력 증폭기의 선형성을 개선한 860 MHz 대역의 송신기의 설계에 관한 것이다. 피드백 루프를 통하여 발생하는 이득 및 위상의 불일치와 DC offset에 의한 영향을 제거하기 위하여 ADS simulation을 이용하여 특성 변화를 예측하였다. 제작된 Cartesian 피드백 송신기는 출력 전력 43 dBm에서 -54 dBc의 IMD3 특성을 나타내었으며, 이는 선형화 전과 비교하여 22.4 dB의 선형성 개선 효과가 있음을 의미한다. 따라서 본 논문에서 제작한 Cartesian 피드백 송신기를 이용하여 협-대역 전송시스템에 적용할 수 있음을 확인하였다.