CEREC$^{(R)}$ AC system으로 채득된 디지털 인상의 재현성, 정확성 평가에 관한 연구

김재홍,김기백,김혜영,김정애,김웅철,김지환,Kim, Jae-Hong,Kim, Ki-Baek,Kim, Hae-Young,Kim, Jung-Ae,Kim, Woong-Chul,Kim, Ji-Hwan 대한치과기공학회 2012 대한치과기공학회지 Vol.34 No.2

Purpose: The aim of this study was to determine the reliability and accuracy of measurements in digital models(CEREC$^{(R)}$ AC) compared to stone models. Methods: A master model(500B-1, Nissin Dental Product, Japan) with the prepared upper full arch tooth was used. Conventional impression and then stone model(n=10) were produced from this master model, and on the other hands, digital impressions were made with the CEREC$^{(R)}$ AC intra-oral scanner(n=10). One examiner measured two times the intercanine, intermolar distance, dental arch length. The stone model were measured using a digital caliper. The t-student test for paired samples and intraclass correlation coefficient(ICC) were used for statistical analysis. Results: The measurement of two methods showed very good reliability. At the intra-examiner reliability of measurement, ICC at the stone and CEREC$^{(R)}$ AC model were 0.81 and 0.94. The mean difference between measurements made directly on the stone models and those made on the CEREC$^{(R)}$ AC model was 0.20~0.28mm, and was statistically significant(P=0.001). Conclusion: These in vitro studies show that accuracy of the digital impression is similar to that of the conventional impression. These results will have to be confirmed in further clinical studies.

디지털 인상 채득 시 흔히 발생하는 오류에 관한 연구 - CEREC$^{(R)}$ AC의 사례 중심으로 -

김재홍,김지환,김혜영,Kim, Jae-Hong,Kim, Ji-Hwan,Kim, Hae-Young 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.3

Purpose: The purpose of the study was a quantitative evaluation of common errors in digital impression procedure using CEREC$^{(R)}$ AC system. Methods: Two-hundreds digital impression data comprising 174 inlays, 26 onlays by CEREC$^{(R)}$ AC in-office CAD/CAM system were obtained from a dental clinic. One evaluator assessed errors of the digital impression data and divided into five categories of errors: inappropriate scanner positioning (ISP), improper handling with a scanner (IHS), irregular powder arrangement (IPA), improper cavity preparation (ICP), and insufficient scanned data (ISD). Results: The most common errors were IPA(21%), and ISP and ISD were followed by 17% respectively. IHS was found in 14.5% of all digital impression data. ICP comprising only 6.5% was the rarest. Conclusion: Most errors were due to inaccurate manipulation with an intraoral scanner or improper cavity preparation for scanning. A deliberate manipulation to prevent common errors mentioned may deliver an optimal result in the digital impression procedure.

ShadeEye$^{(R)}$ NCC system을 이용한 Vita CAD/CAM Ceramic Block의 크기에 따른 색조 일치성 비교연구

김재홍,김혜영,김웅철,김지환,Kim, Jae-Hong,Kim, Hae-Young,Kim, Woong-Chul,Kim, Ji-Hwan 대한치과기공학회 2011 대한치과기공학회지 Vol.33 No.3

Purpose: The purpose of this study was to compare color correspondence of different sizes of Vita Mark II$^{(R)}$ and TriLuxe$^{(R)}$ Feldspar blocks. Methods: The three commercially available shades(1M2, 2M2, 3M2) of Mark II & TriLuxe blocks for the CEREC$^{(R)}$ CAD/CAM system were examined. For each of three colors, three different sizes were tested, 5 blocks each. The measurements were made using a spectrophotometer equipped with an integrating sphere using the CIE $L^*$, $a^*$, $b^*$ colorimetric system. Results: The $L^*$, $a^*$, $b^*$ value of Vita Mark II$^{(R)}$ ceramic block showed significantly higher than TriLuxe$^{(R)}$ ceramic block(p<0.05). In comparing the Vita Mark II$^{(R)}$ specimen of the three different shade, color differences between materials(${\Delta}E^*$) showed the lowest value of 2.09, and the highest was 2.24. ${\Delta}E^*$ values of the materials of Vita Mark II$^{(R)}$ were higher than 2. As the size of ceramic block differed, the color correspondence of Vita Mark II$^{(R)}$ showed statistically significant difference but, this result is clinically acceptable. Conclusion: All the different sizes of the different shades of Vita TriLuxe$^{(R)}$ blocks for the CEREC$^{(R)}$ system showed the high degree of color correspondence necessary in industrially prefabricated CAD/CAM blocks. The results of the present study suggested that it would be necessary to establish the reproducible and constant color specification system for an esthetic restoration.

CEREC^ⓡ system에서 사용하는 세라믹 소재로 가공된 CAD/CAM 전부도재관의 변연간격 비교분석

김재홍,김기백,김사학,Kim, Jae-Hong,Kim, Ki-Baek,Kim, Sa-Hak 대한치과기공학회 2016 대한치과기공학회지 Vol.38 No.3

Purpose: The purpose of this study is to evaluate the marginal gap of all-ceramic crowns fabricated by CEREC$^{(R)}$ in-office CAD/CAM system. Methods: The mandibular first molar was selected as the abutment for the experiments. Thirty working models were prepared. VITA Mark II(VM) and VITA Enamic(VE), LAVA Ultimate(LU) blocks were milled using CEREC MCXL with CEREC 3D system to construct 10 crowns for each groups. To measure marginal gap, milled restorations were examined under digital microscope with scale under 160x magnifications. The results were statistically analyzed using the one-way ANOVA and Tukey's HSD test(${\alpha}=0.05$). Results: There was no significant difference in the marginal gap regarding to ceramic materials(p>0.05). Conclusion: Single crowns fabricated using CEREC in-office CAD/CAM system provided clinically acceptable marginal gap. This confirmed that the type of ceramic material used does not determine the precision of fit of a prosthesis.

이명 심각도에 따른 정신의학적 특징

김재홍,김정호,조성일,박상학,김상훈,추일한,김승곤,Kim, Jae Hong,Kim, Jung Ho,Cho, Sung Il,Park, Sang Hag,Kim, Sang Hoon,Choo, Il Han,Kim, Seung Gon 대한생물정신의학회 2015 생물정신의학 Vol.22 No.1

Objectives The purpose of this study was to examine the psychiatric characteristics of outpatients with tinnitus. Methods A total of 88 subjects were included in this study. According to Tinnitus Handicap Inventory (THI) scores, the subjects were classified into two group ; a mild tinnitus symptoms (mild-tinnitus) group and a severe tinnitus symptoms (severe-tinnitus) group. A questionnaire was used for an assessment of demographic characteristics, and the THI, the Visual Analogue Scale (VAS) about tinnitus, the Beck Depression Inventory (BDI), and the Beck Anxiety Inventory (BAI) are applied for evaluation of other clinical psychiatric characteristics. Results Higher THI scores were positively correlated with tinnitus course, the number of accompanying symptoms, and the VAS. BDI total scores, BDI factors, and BAI total scores were significantly higher in the severe-tinnitus group than in the mild-tinnitus group. Also suicidal ideation, interpersonal problems, sleep problems, occupational impairment, and fatigue were significantly higher in the severe-tinnitus group than in the mild-tinnitus group. Conclusions Tinnitus is a common disorder of hearing which is associated frequently with psychiatric problems. This study suggests that psychiatric interventions should be taken into consideration in the treatment of patients suffering from tinnitus.

이달의 육계전망 - 경제주령 이상의 육용종계 도태 시급

김재홍,Kim, Jae-Hong 대한양계협회 2017 월간 양계 Vol.49 No.12

이달의 육계전망 - 수입닭고기와 삼계사육마리수 증가에 따른 닭고기 공급량 증가

김재홍,Kim, Jae-Hong 대한양계협회 2018 월간 양계 Vol.50 No.11

오장변증중(五臟辨證中) 간실증(肝實證)의 오사(五邪)에 의한 연구

김재홍,김태희,Kim, Jae-Hong,Kim, Tae-Hee 대한한방내과학회 1994 大韓韓方內科學會誌 Vol.15 No.1

1. The Jung-Sa(正邪) of the Excessive Liver-Symptoms belongs to the eleven symptoms, there are blue face, blue thin fingernail, anger, fancy of larg body, dizziness, eye flame, Bell's palsy, hard swelling pain at braest, side pain going on the belly from the side, side pain and movement at the left side. 2. The Mi-Sa(微邪) of the Excessive Liver-Symptoms belongs to the four symptoms, there are meat in eye, edema in cheek, lack of appetite and diarrhea. 3. The Juk-Sa(賊邪) of the Excessive Liver-Symptoms belongs to the only one symptom, this is nosebleeding. 4. The Hu-Sa(虛邪) of the Excessive Liver-Symptoms belongs to the three symptoms, there are scrotum constraction, strain in belly and constipation. 5. The Sil-Sa(實邪) of the Excessive Liver-Symptoms belongs to the twenty eight symptoms, there are red eye, raised eyes(兩眼上?), spitting blood, sternocostal turgid pain, turgidity in belly, drooping testis, vomiting water acid, sickening, belching, confusion, impatience, frequent forgetfulness, headache, giddness, eye pain, deaf, ringing in the ear, feeling inverse, drying mouth, stuffiness sensation in the chest, chest pain, stuffiness sensation in the belly, bellyache, quadriplegia, spasm of extremities, tremor, alternate spells of fever and chills, high fever and strain in muscle. 6. Those symptoms, Red corner of the eye, red face, swelling on the forehead, stiff-neck and back strong, opisthotonos, constracture of the limbs, vomiting yellow bitter water, speech impediment, epilepsy, depression, strong tongue, different thing in throat, fullness and distention of the gastric region, feeling sick and tenesmus, have no connected with the Excessive Liver-Symptoms(肝實證) 7. The Excessive Liver-Symptoms(肝實證) is connected with the ganjabyoung(肝自病) and Hwa(火) which the pathology is, than because Mock(木) is excessive and Mock-Saeng-Hwa(木生火), the ganjabyoung(肝自病) and Sil-Sa(實邪) are many. 8. There are the sixteen symptoms with the exception of The Excessive Liver-Symptoms(肝實證), because supposed that the scholars in medicine included the union syndroms(合病), the combine syndroms(兼病) and the analysis of symptoms(辨證) in The Analysis of Five Visceral Symptoms. 9. During consideration of the symptoms at the above statements, where are many causes by Gan-Pung(肝風), there is difficult of distinction between the excessive Liver-Symptoms(肝實證) and C.V.A(Cerebral Vascular Attack). Because than NaeKyung(內經) distinguished between the excessive Liver-Symptoms(肝實證) and C.V.A., the future medical specialists connected with the excessive Liver-Symptoms(肝實證) and C.V.A.. 10. An appearance of Sang-Hwa(相火) that the liver possessed is divided into an appearance of Hwa(火), there will be making a study att the more necessary. 11. The cuases of each syndroms are consist of the origins of syndroms, its pathology and the positions where the syndroms appeared, I consider that is the various ways how judge the syndroms except the Five Pathogenic Factors(五邪). 12. If more than study will be achieved in all, the new definition will be standed about the Excessive and Deficient Five Visceral Syndroms(五臟虛實證), I consider this will be the foundation data that study the Oriental Medicine and the important data that is a judgement standard of clininc.

반려 로봇

김재홍,서범수,조재일,최정단,Kim, J.H.,Seo, B.S.,Cho, J.I.,Choi, J.D. 한국전자통신연구원 2021 전자통신동향분석 Vol.36 No.1

This article presents the future vision and core technologies of the "Life Companion Robot," which is one of the 12 future concepts introduced in the ETRI Technology Roadmap published in November 2020. Assistant robots, care robots, and life support robots were proposed as the development stages of life companion robots. Further, core technologies for each of the ten major roles that must be directly or indirectly performed by life companion robots are introduced. Finally, this article describes in detail three major artificial intelligence technologies for autonomous robots.

이달의 계란전망 - 추석 이후 계란가격 하락이 예상됨에 따라 고주령계군의 도태가 선행되어야

김재홍,Kim, Jae-Hong 대한양계협회 2018 월간 양계 Vol.50 No.10