임플란트 환자의 유형 및 분포에 대한 연구

홍성재,백정원,김창성,최성호,이근우,채중규,김종관,조규성,Hong, Sung-Jae,Paik, Jeong-Won,Kim, Chang-Sung,Choi, Seong-Ho,Lee, Keun-Woo,Chai, Jung-Kiu,Kim, Chong-Kwan,Cho, Kyoo-Sung 대한치주과학회 2002 Journal of Periodontal & Implant Science Vol.32 No.3

It has been approximately 40 years since $Br{{\aa}}nemark$ first introduced osseo-integration for implants in the early 1960s. Unlike crown and bridge or denture treatment, implant treatment helps preserve existing bone and improve masticatory functions. Thus, the awareness of implant treatment has grown rapidly among dentists and patients alike in Korea, as it becomes a widely accepted treatment. The following results on patients type and implant distribution were compiled from 1814 implant cases of 640 patients treated at the periodontal dept. of Y University Hospital during 1992 to 2001. 1. There are no dissimilarities between men and women, with patients in their 40,50s accounting for 49% of patients and 56% of implant treatments; the largest share of patients and implant treatments. 2. Mn. posterior area accounted for 59% of implant treatments followed by Mx. posterior area(21%), Mx anterior area(l4%) and Mn anterior area 2%. 3. Partial edentulous patients treated by single crown and bridge-type prosthesis accounted for 98% and fully edentulous patient accounted for the remaining 2% 4. The major cause of tooth loss is periodontal disease, followed by dental caries, trauma and congenital missing. Compared to women, men are more likely to suffer from tooth loss due to periodontal disease. Also, older people are more likely to suffer from tooth loss due to periodontal disease rather than dental caries. 5. The distribution of bone quality for maxillae was 52% for type III, followed by 23% for type II, 20% for type IV and 0% for type I. As for mandible, the distribution was 52% for type II, followed by 37% for type III, 7% for type IV and 4% for type I. 6. The distribution of bone quantity for maxillae was 49% for type C, followed by 34% for type B, 14% for type D, 3% for type A, and 0% for type E. As for mandible, the distribution was 52% for type B, followed by 35% for type C, 6% for type D, 3% for type A and 0% for type E. 7. The majority of implants were those of 10-14mm in length (80%) and regular diameter in width (79%). The results provided us with basic data on patient type, implant distribution, bone condition, etc. We wish that our results coupled with other research data helps assist in the further study for better implant success/survival rates, etc.

소아 전두골에 발생한 랑게르한스세포 조직구증

홍성재,조상헌,어수락,Hong, Seong Jae,Cho, Sang Hun,Eo, Su Rak 대한두개안면성형외과학회 2013 Archives of Craniofacial Surgery Vol.14 No.1

Lateral eyebrow mass with primary skull lesion are rare in pediatric population. Although epidermoid cyst and dermoid cyst are the most commonly encountered skull lesions in pediatric population, Langerhans cell histiocytosis (LCH) is rarely reported. We report a case of LCH arising from the lateral eyebrow with osteolytic lesion involving the frontal bone. A 5-year-old boy was presented with a hard, fixed mass in his lateral eyebrow. Contrast magnetic resonance imaging revealed inhomogeneous enhancement of the mass with direct invasion of the frontal bone and adjacent dura mater. Under general anesthesia, linear incision at the lateral eyebrow region was made. Intraoperative evaluation revealed hard, fixed and well-defined soft tissue mass. The final extirpated mass was $2.5{\times}2.4cm$ in size, and was accompanied by a $1{\times}1cm$ sized defect on the frontal bone with intact dura mater. The surgical wound was closed primarily by a layer-by-layer fashion. Histologic examination was later performed for definite diagnosis. The histologic examination revealed abnormal proliferation of Langerhans cell with granuloma formation. Radionuclide bone scan and positron emission tomography was taken and revealed free of multi-organ involvement. At 3 months after surgery, natural looking contour at the lateral eyebrow region was observed with no tumor recurrence. Differential diagnosis of the hard and fixed mass at the lateral eyebrow region affecting the primary skull lesion from pediatric population includes epidermoid cyst, dermoid cyst and LCH. Generally, brief physical examination with plain X-ray view can be performed for clinical evaluation, but for a definite diagnosis, contrast MRI may be helpful.

대체서식지 조성을 위한 거머리말 이식 및 모니터링

홍성재,최창근,Hong, Seong Jae,Choi, Chang Geun 한국해양생명과학회 2018 한국해양생명과학회지 Vol.3 No.1

We investigated natural habitat of seagrass and created replacement habitat to monitor for restoration of the habitat which is expected to be damaged at Cheonseong harbor in Busan. Depth of water for natural seagrass habitat at Cheonseong harbor was 1.2~3.1 m and the water temperature was 7.4℃, salt concentration was 29.1 psu and pH was 8.05 in January, 2013. The density of seagrass was 167.1±16.4 shoots m^-2, the total length was 48.5±18.1 cm, the height of sheath was 9.1±2.8 cm and the width of leaf was 4.8±1.1 cm, respectively. We transplanted in December 2014 and monitored the habitat during 9 months after transplanted. In the beginning, the density of seagrass was decreased to 8.5 shoots patch^-1 in January and was increased to 19.0 shoots patch^-1 in April. The total height were 73.3±2.9~121.3±6.1 cm, the length of sheath were 9.6±0.6-21.0±1.2 cm, the width of leaf were 5.7±0.1~6.8±0.2 mm. It showed that all values were increased steadily until July and was decreased rapidly in August. Flowering shoot, which was not observed in the beginning of transplanting, started to be spotted in March and was continued to be seen during the monitoring period. We were able to observe seedling of germinated seagrass in seeds in the replacement habitat next year.

RNN 추론 프로세서를 위한 통합 검증 시스템

홍성재(Seong-Jae Hong),김지호(Ji-Ho Kim),김태환(Tae-Hwan Kim) 대한전자공학회 2022 대한전자공학회 학술대회 Vol.2022 No.6

남해 동부 연안에 자생하는 잘피의 분포 현황

홍성재(Seong Jae Hong),이재호(Jae Ho Lee),최창근(Chang Geun Choi) 한국생태공학회 2021 한국생태공학회지 Vol.8 No.1

This survey was conducted to investigate the species, area, water depth and density of seagrass to the south east coast using field survey (SCUBA diving) and drone aerial photography. The occurrence seagrass in this survey were 6 station of Geoje (Yegu, Gujora, Dadae, Dapo, Geunpo, and Daepo) and 5 station of Tongyeong (Chuwon, Bongam, Changgwa, Yeomho, and Chukpo), and Zostera marina, Zostera caespitosa, and Halophila nipponica were investigated. Habitat area was the largest at 20,788 m2 in the Dadae and the smallest area was 51 m2 in the Chukop. Density was highest at 182.4 shoots/m2 in Geunpo and lowest at 89.6 shoots/m2 in Yeomho. Most of the water depths were around 3 m, but in Bongam, it was found that even at 7 m depth, the form of the Zostera marina was grassland and the Zostera caespitosa was distributed in the form of a patch. Compared with the previous studies, the area was increased or decreased depending on the survey region, but the occurrence species did not find Zostera caulescens, Zostera japonica, Phyllospadix iwatensis.

CSI 와 소리 인식을 통한 실시간 헬스 모니터링

홍성재(Seong Jae Hong),이학수(Hack Soo Lee),김효주(Hyo Ju Kim),양성준(Seong Jun Yang),한승재(Seung Jae Han) 한국통신학회 2020 한국통신학회 학술대회논문집 Vol.2020 No.2

독도 조하대 대형무척추동물의 군집구조

이재호(Jae Ho Lee),신명화(Myung-Hwa Shin),노현수(Hyun Soo Rho),이희갑(Hee Gab Lee),홍성재(Seong Jae Hong) 한국생태공학회 2022 한국생태공학회지 Vol.9 No.1

This study was conducted in June and September 2022 to analyze the macrofauna community of Dokdo. The total number of macrofauna in Dokdo is 120 species (annelida 10, arthropoda 30, chordata 1, cnidaria 3, echinodermata 7, mollusca 60, nemertea 1, porifera 7, sipuncula 1), and the average biomass was 3,624.65 g/㎡ in total (annelida 1.20 g/㎡, arthropoda 381.16 g/㎡, chordata 0.38 g/㎡, cnidaria 0.78 g/㎡, echinodermata 32.74 g/㎡, mollusca 3,182.89 g/㎡, nemertea 0.28 g/㎡, porifera 23.75 g/㎡, sipuncula 1.46 g/㎡), and the everage individuals was 376.67 ind./㎡ (annelida 28.89 ind./㎡, arthropoda 224.56 ind./㎡, chordata 0.11 ind./㎡, cnidaria 1.33 ind./㎡, echinodermata 4.44 ind./㎡, mollusca 103.33 ind./㎡, nemertea 0.22 ind./㎡, porifera 1.78 ind./㎡, sipuncula 12.00 ind./㎡). 60 species, 238.37 g/㎡, 135.33 ind./㎡ from haenyobawi, 83 species, 10,038.61 g/㎡, 776.35 ind./㎡ from ddongyeo, 78 species, 596.96 g/㎡, 218.33 ind./㎡ from hogdomgul were investigated. The number of species, average biomass and average individual showed the highest values in ddongyeo. The dominant species of marine macrofauna based on biomass were Mytilus unguiculatus at 2,778.45 g/㎡, Pseudoctomeris sulcata at 279.19 g/㎡, Turbo cornutus at 132.11 g/㎡, Neopycnodonte cochlear at 199.26 g/㎡ and Ostrea circumpicta at 80.86 g/㎡. In both the survey period, Mytilus unguiculatus were the highest at 2,466.19 g/㎡ and 3,090.70 g/㎡, respectively, and it was judged to be a good environment for mussels to inhabit. Research on marine macrofauna in Dokdo has been conducted irregularly in the past, and continuous research and long-term monitoring are needed to accurately determine the community structure.

($CO_2$)레이저를 이용한 백서의 치은절제술시 출력에 따른 초기 치유과정의 비교

조규성,홍성재,최성호,채중규,김종관,Cho, Kyoo-Sung,Hong, Sung-Jae,Choi, Seong-Ho,Chai, Jung-Kiu,Kim, Chong-Kwan 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.3

레이저를 이용한 연조직 수술은 출혈이 없어 시야를 좋게 하고 시술시간이 단축되며, 술후 종창이 최소화 되고, 통증이 감소화 최소화된 반흔 형성, 그리고 레이저가 조사되는 일부 부위의 멸균효과등이 장점이 있어 최근에 의학분야 및 치의학분야에서 많이 사용되는 추세에 있다. 이에 본 연구에서는 $CO_2$레이저를 이용한 백서의 치은절제술시의 치유과정과 레이저 출력을 달리 하였을때의 치유과정을 관찰하기 위해, 백서의 상악전치의 치은조직에서 치은절제술 효과를 얻을 수 있는 최소 출력인 4watts를 이용한 부위를 대조군으로, 6watts를 이용한 부위를 실험군으로 하여, 술후 2일, 3일, 1주, 3주후에 각각 실험동물을 희생시켜 치유결과를 조직학적으로 비교 관찰하여 다음과 같은 결과를 얻었다. 대조군과 실험군 모두에서 2일째에서만 작은 크기의 혈병이 관찰되었고, 그 이후에서는 관찰되지 않았다. 2. 염증세포 침윤지역 크기는 대조군과 실험군 모두에게 2일째 가장 컸으며, 그 크기는 시간이 경과될수록 줄어들어 2주째는 거의 소실되었으며, 실험군의 경우 대조군에 비해 2,3째까지 크기가 더 컸으나, 1주째부터는 크기의 차이가 관찰되지 않았다. 3. 육아조직은 대조군, 실험군 모두 시간의 경과에 따라 점점 성숙되어, 2주째부터는 거의 정상 치은 결합조직으로 대체되는 소견을 보였고, 3주째에서는 완전한 치유양상을 보였다. 실험군의 경우 대조군보다 3일째까지는 그 크기가 더 컸으나 1주째부터는 크기의 차이가 없다. 4. 대조군과 실험군 모두에게 치은의 상피화하는 2일째에서 시작되는 소견을 보였고, 1주부터 상피돌기와 부분적인 접합상피의 재생이 관찰되었으며, 2주째부터는 구강열구상피의 각화가 시작되어 3주째에는 각화의 완성이 관찰되었다. The use of laser in the treatment of soft tissue minimizes hemorrhage, provides better view of the operating field, and thereby minimizes operating time. Also, there will be far less post-operative swelling, pain and scar formation, and sterilizing effect are shown in some portions of the wound site. All these advantages of laser therapy contribute to its widespread use in the field of medicine and dentistry. Regarding such facts, we used CO2 laser of different watts in gingivectomy for white rats to compare initial healing process. For the control group, the least amount of output in performing gingivectomy(4watts) was offered, and for the experimental group, 6watts was given. Animals were sacrificed on the second, third days, 1 weeks, 2 weeks, and 3 weeks after operation, and their specimens were histologically analyzed. The following results were obtained: 1. Blood clot of small size was observed in both the control and experimental groups after two days, and no more thereafter. 2. In both the control and experimental groups, the inflammation zone size was the greatest after two days, and it decreased gradually to become almost invisble by the second week. The experimental group showed larger size of inflammation zone during second and third days: however, there was no difference after one week. 3. Granulation tissue in both the control and experimental groups showed gradual maturation with time, and by the second week, it was almost replaced by normal connective tissue. By the third week, complete healing pattern was observed. The experimental group showed larger granulation tissue than the control group until the third day, but there was no significant difference after one week. 4. In both the control and experimental groups, gingival epithelialization began on the second day. After one week, regeneration of rete peg and partial formation of junctional epithelium were observed: by the second week, keratinization of oral sulcular epithelium began, and it was completed by the third week.

Mean Profile Depth를 이용한 아스팔트 포장의 타이어-노면소음 산정 연구

현택집,홍성재,김형배,이승우,Hyun, Tak Jib,Hong, Seong Jae,Kim, Hyung Bae,Lee, Seung Woo 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4

포장파손과 IRI 등의 요소들은 포장상태를 평가하는 중요한 요소이다. 최근 들어 주행쾌적성에 영향을 주는 타이어-노면소음을 포장관리 시스템에 포함시키는 필요성이 대두되고 있다. PLP(Portable Laser Profiler)를 이용하여 주행 중 노면조직특성인 평균프로파일깊이(MPD)를 측정할 수 있는 기법이 개발되었다. 일반적으로 타이어-노면소음은 노면조직특성에 따라 다르게 발생하며, 타이어-노면소음을 예측하는 유용한 정보로 사용할 수 있다. 본 연구에서는 아스팔트 구간의 노면조직특성에 따른 타이어-노면소음을 평가하기 위해 다수의 아스팔트 구간에서 MPD와 타이어-노면소음을 동시에 측정하여 데이터를 획득하였으며, 통계학적 분석을 통해 타이어-노면소음 추정식을 제안하였다. Distress data, IRI, etc. are important factors in the evaluation of pavement condition. Recently, the need to consider tire-pavement noise in PMS (pavement management system) is raised. Generally, tire-pavement noise highly depends on the characteristics of pavement texture. Therefore, estimation of texture characteristics may give useful information to predict tire-pavement noise. Measurement of MPD (Mean Profile Depth) by using PLP (Portable Laser Profiler) provide very fast. The texture characteristics by means of MPD can be in a short time. hence, It can be a good alternative to give noise information, if MPD and tire-pavement noise have robust relationship. In this study, MPD and tire-pavement noise were simultaneously collected on the number of asphalt section to evaluate the tire-pavement noise due to the pavement texture characteristics. A set of statistical analysis was performed to propose relationship between tire-pavement noise and MPD for asphalt concrete pavement.

롤러 전압 콘크리트 포장을 위한 수정다짐시험의 반복재현성 고찰

황석희,홍성재,이승우,Hwang, Seok Hee,Rith, Makara,Hong, Seong Jae,Lee, Seung Woo 대한토목학회 2015 대한토목학회논문집 Vol.35 No.4

롤러전압콘크리트(Roller Compacted Concrete Pavement, RCCP) 공법은 적은 단위수량이 포함된 콘크리트 혼합물을 아스팔트 피니셔와 다짐 롤러를 이용하여 시공하는 공법이다. RCCP는 다짐 수준에 따라 강도 및 내구성에 많은 영향을 받게 된다. 또한 품질관리는 건조밀도를 기준으로 다짐도 관리를 시행하고 있다. 현장에서 최적의 건조단위중량을 모사하기 위해 수정다짐시험을 실시한다. 그러나 RCCP를 위한 수정다짐시험의 다짐곡선 분석에 명확한 기준이 제시되어 있지 않다. 본 연구에서는 함수비당 세 개의 샘플에 의한 수정다짐곡선의 기준을 설정하고 설정된 다짐곡선과 비교하여 더 적은실험횟수와의 신뢰성을 분석하기 위해 반복재현성을 고찰하였다. 이로 인해 세 번의 실험에 의한 수정다짐시험과 비교하여 두 번의 수정다짐시험은 0.5% 오차가 발생되며 신뢰도는 99.5% 이다. Roller Compacted Concrete Pavement (RCCP), is a type of pavement using compaction roller and asphalt finisher on concrete mixture that contains low amount of water. RCCP strength and durability are greatly affected by compaction level. Quality control is performed by ensuring the degree of compaction at site based on dry density. In the field, Modified Proctor Test is used in order to obtain optimum dry density. However, there is no clear compaction curve analysis criteria of Modified Proctor Test for RCCP. In this study, compaction curve built by three samples of Modified Proctor Test was produced and it was used to compare with compaction curve contented lower number of samples (one and two samples) in order to analyze their reliability. Thus, a conclusion was drawn from the results; by comparing to the result from Modified Proctor Test of three samples, the use of two samples represented result with only 0.5% of error which means the reliability is 99.5%.