양상태 소나를 운용하는 자함이 기동하는 구간에서 추적성능향상을 위한 다수모델기반의 자료결합기법 연구

박승효,송택렬,이승호,Park, Seung-Hyo,Song, Taek-Lyul,Lee, Seung-Ho 한국음향학회 2017 韓國音響學會誌 Vol.36 No.3

For the target tracking in cluttered environment using a bistatic sonar whose transmitter and receiver are separately positioned, it is necessary to use data association algorithm via applying a proper measurement modelling to the bistatic sonar. The measurements obtained from the interval of ownship's maneuver have an increased error due to uncertainty of the position of transmitter and receiver. Using the measurements from this interval results in poor target tracking performance. In this paper, an improved tracking performance for the proposed data association based multiple model algorithm is validated by a monte carlo simulation. 송신기와 수신기가 분리되어 있는 양상태 소나를 자함에 설치하여 운용하고 다수의 클러터가 존재하는 환경에서 표적추적을 수행하기 위해서는 양상태 소나에 알맞은 측정치 모델링이 적용된 자료결합 알고리듬이 요구된다. 자함이 기동하는 구간에서는 송신기와 수신기의 위치가 많이 흔들림에 따라 측정치에 오차가 많이 커지게 되어, 이 구간에서 얻은 측정치정보를 이용하면 추적성능저하가 생기게 된다. 본 논문에서는 공정잡음이 다른 다수모델기반의 자료결합 알고리듬인 IMM-IPDA(Interacting Multiple Model-Integrated Probabilistic Data Association)를 사용하였고, 몬테칼로 시뮬레이션을 통해 추적성능향상을 확인하였다.

IN VITRO EVALUATION OF EXPERIMENTAL FLUORIDE TAPE IN INHIBITION OF ENAMEL DEMINERALIZATION

김민정,이상호,이난영,박승효,Kim, Min-Jung,Lee, Sang-Ho,Lee, Nan-Young,Park, Seung-Hyo Korean Academy of Pediatric Dentistry 2012 大韓小兒齒科學會誌 Vol.39 No.2

본 연구의 목적은 법랑질 표면 미세경도의 측정과 주사전자현미경 관찰을 통해 본 교실에서 개발한 2.26%의 불소를 함유한 폴리비닐알코올 테잎 (F-PVA tape)의 법랑질 탈회 억제 효과를 평가하기 위한 것이다. 60개의 법랑질 표본을 각 군당 15개 씩, 임의로 대조군, F-PVA tape 군, 불소바니쉬 군, CPP-ACFP 군으로 나누고, 각각의 재광화 제재를 도포한 후 pH-cycling 과정 거쳤다. 표본의 표면 미세경도를 측정하고 표면 미세경도 소실량을 계산하였다. 주사전자현미경 관찰을 위해, 각 군에서 5개의 표본을 추출하고 형태학적 특징을 분석하였고 다음과 같은 결론을 얻었다. 1. pH-cycling 후, F-PVA tape 군과 불소바니쉬 군의 법랑질 표면 미세경도 값은 CPP-ACFP 군과 비교 시 유의하게 높았으며, F-PVA tape 군과 불소바니쉬 군 사이에는 유의한 차이가 없었다. 2. 주사전자현미경 관찰 시, F-PVA tape 군과 불소바니쉬 군에서는 법랑질 표면에 형성된 수많은 구형 및 난원형의 결정 입자들이 관찰되었으며, 결정 입자의 밀도는 대조군 및 CPP-ACFP 군에서 보다 높았다. F-PVA tape은 법랑질의 탈회를 억제하는데 효과적이며, 그 효과는 불소바니쉬와 견줄만하고, CPP-ACFP 보다 우수하다. The aim of this in vitro study was to evaluate the effectiveness of experimental 2.26% fluoride-polyvinyl alcohol (F-PVA) tape in inhibition of enamel demineralization using enamel surface microhardness (SMH) analysis and scanning electron microscopy (SEM) examination. Enamel specimens (n=60) randomly assigned to four groups: control group, F-PVA tape group, fluoride varinish (F-varnish) group, casein phosphopeptide-amorphous calcium phosphate (CPP-ACFP) group. After topical application, pH-cycling was processed. Then, SMH was measured and the percentage loss of surface microhardness (%SML) was calculated. For the SEM examination, five sample specimens in each group were treated and the morphologic character was evaluated. After pH-cycling, the SMH values of the enamel specimens of F-PVA tape and F-varnish group were significantly higher than that of CPP-ACFP group, there was no significant difference between F-PVA tape and Fvarnish group. With SEM examination, enamel surfaces in the F-PVA tape group and F-varnish group showed numerous spherical and ovoid crystals formed on the enamel surface were also observed. The density of crystals was higher than that of both control group and CPP-ACFP group. F-PVA tape is effective in inhibition of enamel demineralization. Also, F-PVA tape's inhibition of enamel demineralization is comparable to that of F-vanish and greater than that of CPP-ACFP.

극좌표계 표적 추적필터 기반 함포 사출탄 운동정보 추정성능 개선

서의석(Ui-Suk Suh),박성문(Sung-Mun Park),박승효(Seung Hyo Park),송익환(Ikhwan Song),김우찬(Woo Chan Kim),김의진(Eui-Jin Kim),서태일(Taeil Suh) 대한전기학회 2024 대한전기학회 학술대회 논문집 Vol.2024 No.7

항법오차 성능을 고려한 수중운동체 모델 결정방법

김진관(Jin-Kwan Kim),황익호(Ick-Ho Whang),나원상(Won-Sang Ra),박승효(Seung-Hyo Park) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

수평면 채널의 순수항법 오차 해석 해를 이용한 잠항 이동체의 SDINS 장주기 오차 분석

서의석(Ui-Suk Suh),김우찬(Woo Chan Kim),박승효(Seung Hyo Park),송익환(Ikhwan Song),서태일(Taeil Suh),나원상(Won-Sang Ra) 대한전기학회 2023 대한전기학회 학술대회 논문집 Vol.2023 No.7

Modified halterman appliance를 이용한 상악 제1대구치의 성공적 맹출유도

전상윤 ( Sang Yun Jeon ),이상호 ( Sang Ho Lee ),이난영 ( Nan Young Lee ),박승효 ( Seung Hyo Park ) 조선대학교 구강생물학연구소 2012 Oral Biology Research (Oral Biol Res) Vol.36 No.1

Ectopic eruption is defi ned as eruption of teeth into an abnormal position due to variable local factors, including disharmony of the tooth-jaw relationship. The prevalence of ectopic eruption has been reported to vary between 0.75-6%. Most ectopic eruptions occur in the maxilla. Methods of treatment are classifi ed as follows: appliances that work on the contact point for unlocking andare cemented on more than one tooth for distal movement, and space regaining after extraction of a deciduous molar. In the fi rst case, ectopic eruption of the fi rst permanent molar was observed, with a second deciduous molar having a resorbed root. In the second case, a second deciduous molar was determined to be suffi cient for single anchorage. In the fi rst case, we treated the ectopic eruption with a bilateral modifi ed halterman appliance and a unilateral appliance was used for the second case. A modifi ed halterman appliance can be regarded as a good solution for treatment of ectopic eruption of maxillary fi rst permanent molars.

치은에 발생한 신경섬유종의 외과적 치험례

박승효,이난영,이상호 大韓小兒齒科學會 2010 大韓小兒齒科學會誌 Vol.37 No.2

제1형 신경섬유종증은 약 3000명당 1명 꼴로 발생되며 상염색체 우성유전질환이다 피부의 카페오레반점 및 다발성 신경섬유종과 피부, 신경계, 골격계, 내분비계, 혈관계의 다양한 이형성이 특정이다. 실제적인 구강 내 신경섬유종은 25%의 환자에서 발생한다고 알려져 았다. 제1형 신경섬유종증으로 진단된 만9세의 여아가 치은의 부종을 주소로 본원에 내원하였다. 하악 전치부 설측에 치은비대가 존재하였고, 환자의 사지와 몸통에서 갈색반점인 카페오레 반점을 확인할 수 있었다. 비대된 치은조직을 국소마취 하에 제거하였고, 조직검사를 시행한 결과 신경섬유종으로 확진하였다. 7개월 후 검사 결과 재발의 증거없이 양호한 치유를보였다. 재발의 가능성이 있으므로 정기적인 검사가 필요하다. Neurofibromatosis type 1, an autosomal dominant disorder with prevalence of 1 per 3000 people, has clinical features of cafe au lait spots in skin, multiple neurofibroma and dysplasia in skeletal, endocrinal, and blood vessel systems. Actual intraoral neurofibromas are known to occur in 25% of patients. A 9 year-old girl diagnosed with type 1 neurofibromatosis visited our hospital with chief complaint of gingival swelling. Gingival enlargement in lower anterior region existed and cafe au lait spots were confirmed in patient' skin. Enlarged gingival tissue were excised under local anesthesia. Neurofibroma was confirmed with biopsy. Clinical examination after months showed fine recovery without any evidence of recurrence. Due to its possibility of recurrence, periodic follow-up will be needed.

응급실 내원 자상 환자의 임상적 고찰

박일영,이훈효,최승혜,이성,박승만,윤상섭,임근우 대한응급의학회 1997 대한응급의학회지 Vol.8 No.2

The frequency of stab wounds is gradually increasing and patients with stab wounds visit the hospital through the emergency room. Management options for patients with stab wound include mandatory exploration and selective observation, but recently many authors have emphasized the importance of selective conservation with development of diagnostic procedure and controversy still exists concerning the management of patients with stab wounds. We retrospectively analysed the clinical data of 78 patients with stab wounds who visited the emergency room of St. Paul`s Hospital over 5 years from January 1 1992 to December 31 1996. The following results were obtained; 1) The most prevalent age group were the twenties & the thirties(58.9% of patient) and then most patients were of young age. The male to female ratio was 2.9:1. 2) Most injuries occured at night between 8 p.m. and 4 a.m.(61.5%)and during September injuries were most frequent. 3) The most common causes of stab wound were fighting(55.1%) followed by suicide(21.8%), then accidents including traffic accidents(16.7%) and robbery(6.4%). 4) The instruments most commonly used were knives(53.8%) and broken glass(28.2%). 5) Half of patients were drunk from alcohol and in 3 cases from an antipsychotic drug. 6) In 11 cases(14.1%), there were multiple wound sites and in 8 cases(10.3%) superficial wounds into subcutaneous fatty tissue. 7) According to stab wound sites, the extremities were wounded in 36 cases(46.2%), chest in 21 cases(26.9%), abdomen in 15 cases(19.2%) and neck in 7 cases(9.0%). 8) Emergency explorations were performed in 43 cases(55.1%)under general or regional anesthesia, which included neck in 4 cases(9.3%), chest in 3 cases(7.0%), abdomen in 11 cases(25.6%) and extremity in 25 cases(58.1%). In exploratory laparotomy, negative exploration rate was 18.2%. 9) Death occured in 2 cases(2.6%). One died due to sepsis with multiple colon perforation and the other due to hypovolemic shock with Superior Vena Cava injury.

불소 테잎 적용 후 시간변화에 따른 타액 내 불소농도

박승효,이상호,이난영 大韓小兒齒科學會 2009 大韓小兒齒科學會誌 Vol.36 No.3

이 연구의 목적은 카르복시메틸셀룰로오스 기저재에 불소를 분사하여 제작한 불소 테잎을 피실험자의 구강 내에 도포 후 잔류하는 불소의 농도를 측정하고자 하는 것이다. APF gel(60seconds taste^(R), 1.23% APF gel, Group Ⅰ), Fluoride varnish(CavityShield™, 5% NaF, Group Ⅱ), Fluoride tape(SCMC-T-5, 5% NaF, Trial product, Group Ⅲ)을 군별로 9명씩 건강한 20대 남녀성인의 구강에 도포 후 1시간, 3시간, 5시간, 7시간, 1일, 2일, 3일 후 비자극성 전타액내 불소농도를 불소이온전극을 이용하여 측정하였으며 다음과 같은 결과를 얻었다. 1. 1, 2, 3일 후와 비교하여 모든 그룹에서 7시간까지 초기농도보다 유의하게 높은 불소농도를 보였다. 도포 후 1, 2, 3일에는 초기농도와 통계적으로 유의한 차이를 보이지 않았다(p>0.05). 2. 도포 후 1, 3, 5, 7시간에 타액 내 불소농도는 모든 시간에서 2군, 3군, 1군 순으로 높았다. 3. 도포 후 1시간과 3시간 후에 2 군의 불소농도는 3 군에 비하여 유의하게 높았으나(p<0.05) 1군과 3군 사이에는 통계적으로 유의한 차이가 없었다(p>0.05). The purpose of this study is to investigate the residual fluoride concentration of fluoride tape in oral cavity which made by spraying NaF on carboxymethylcellulose base. After 1. 3, 5, 7 hours and 1. 2, 3 days of applicating APF gel(60seconds taste^(R), 1.23% APF gel. Group Ⅰ), Fluoride varnish(CavityShield™, 5% NaF, Group Ⅱ) and Fluoride tape(SCMC-T-5, 5% NaF, Trial product, Group Ⅲ) in oral cavity of 27 healthy adults in their twenties, the result of fluoride concentration in unstimulated whole saliva which measured by using fluoride sensitive electrode made up to following conclusion. 1. Until 7 hours after application in every group, it showed significantly higher fluoride concentration in saliva than baseline value but at 1, 2, 3 days after application, there were no significant differences between measurements and baseline value(p>0.05). 2. Until 7 hours after application at every time, mean fluoride concentration in saliva was higher in the order of Group Ⅱ, Ⅰ and Ⅲ. 3. 1 hour and 3 hours after application, Group Ⅱ revealed significantly higher fluoride concentration than Group Ⅲ(p<0.05), but there were no significant differences between Group Ⅰ and Group Ⅲ in every time.