교정장치를 부착한 환자에서 표준진료지침의 구강위생관리능력 개선효과

손우성 ( Woo Sung Son ),김용일 ( Yong Il Kim ),송효경 ( Hyo Kyung Song ),김진범 ( Jin Bom Kim ) 대한예방치과·구강보건학회 2010 大韓口腔保健學會誌 Vol.34 No.2

Objectives. The purpose of this study is to evaluate the effect of the oral hygiene education using the newly designed clinical pathway improving the oral hygiene capability of patients with fixed orthodontic appliance to manage oral hygiene. Methods. The study was conducted on patients beginning orthodontic therapy with fixed orthodontic appliance in Department of Orthodontics, P University Hospital. We applied the newly designed critical pathway on test group (each twenty male/female patients in their teens and twenties) and regular oral hygiene education on control group (each twenty male/female patients in their teens and twenties) and evaluated their capability of oral hygiene management by plaque index and gingival bleeding index. We also evaluated it by age, gender, and period of attaching orthodontic appliance. Independnet t-test and ANOVA were used for statistical analysis. Results. The plaque indices of the test group were lower than those of the control group one, two, three month after bonding the brackets. There were no significant differences in the gingival bleeding indices between test and control group one, two, three month after bonding the brackets. At one month after bonding the brackets, the plaque indices decreased greatly, but 3 months later, the plaque indices became similar to those before orthodontic treatment. Conclusions. Education of oral hygiene management with critical pathway is more effective than the traditional method for the reduction of dental plaque. Education is necessary every 3 months to maintain the oral hygiene abilities continuously.

구개파열자의 상악치궁 회복에 관한 임상적 고찰

손우성(Woo-Sung Son) 대한치과의사협회 1993 대한치과의사협회지 Vol.31 No.12

빔형성 기반 고속 탐색 기법의 신호대 잔향음비 분석

손우성(Son Woo-Sung),서영광(Seo Young-Kwang),김형남(Kim Hyoung-Nam) 한국통신학회 2017 한국통신학회 학술대회논문집 Vol.2017 No.6

Prevalence and treatment of mandibular first molar eruption disturbances

Woo-Sung Son(손우성),Hyo-Kyung Song(송효경),Seong Sik Kim(김성식) 대한치과의사협회 2017 대한치과의사협회지 Vol.55 No.5

Introduction: The aim of the current study was to describe the prevalence and treatment of mandibular first molar eruption disturbances. Methods: A total of 38 mandibular first molars(M1mn) from 36 patients(17 males and 19 females; aged 9 years 2 months?35 years 10 months) were identified from the 13,391 patients that received orthodontic treatment from 1983?2012. The subjects were classified into 3 categories based on panoramic radiographic examination: impaction due to ectopic position of the tooth germ relative to the contra-side same tooth(Group 1), impaction due to obstruction of the eruption path with cyst or calcium mass (Group 2), and primary and secondary retention due to defects in the follicle or periodontal ligament(PDL; Group 3). The treatment outcomes were evaluated into four categories: no treatment(A), orthodontic traction(B), autotransplantation(C), and extraction due to orthodontic traction failure(D). Results: The prevalence rate of M1mn eruption disturbances in this sample was 0.27%. In Groups 1 and 2, most of the impacted M1mn were erupted successfully by orthodontic traction. In Group 3, most of the retained M1mn were failed to erupt and recommended for extraction. Conclusions: Treatment prognosis was favorable on Group 1 & 2 than Group 3. After removing an element of the cause in case of Group 1 & 2, orthodontic traction or periodic observation will be recommended.

소나방정식 기반 송/수신빔 조향각에 따른 탐지범위 분석

손우성(Son Woo-Sung),서영광(Seo Young-Kwang),김완진(Kim Wan-Jin),김형남(Kim Hyoung-Nam) 한국통신학회 2017 한국통신학회 학술대회논문집 Vol.2017 No.1

악교정 수술을 받은 골격성 III급 부정교합 환자의 악관절 상태에 관한 연구

손우성(Woo-Sung Son),정충보(Choong-Bo Jung),김종렬(Jong-Ryoul Kim) 대한턱관절교합학회 2006 구강회복응용과학지 Vol.22 No.4

교정치료 후 나타나는 재발 경향에 대한 정량적 평가와 영향을 미치는 요소에 대한 연구

손우성(Woo-Sung Son),차경석(Kyung-Suk Cha),정동화(Dong-Hwa Chung),김태우(Tae-Woo Kim) 대한치과교정학회 2011 대한치과교정학회지 Vol.41 No.3

본 연구는 교합 상태를 객관적이고 정량적으로 평가하기 위해 개발된 American Board of Orthodontics objective grading system (ABO-OGS)을 이용하여 교정치료 후 나타나는 재발 경향을 평가하고 이에 영향을 줄 수 있는 요소들과의 상관관계를 알아보고자 시행되었다. 부산대학교, 경희대학교와 단국대학교 치과병원 교정과에서 포괄적 교정치료를 받은 환자 중 치료종료 후 2년 이상의 유지기간을 갖는 80명의 환자를 대상으로 초진 시(T1)의 peer assessment rating (PAR) index, 치료 후(T2)와 유지 후(T3) 시기의 ABO-OGS를 측정하여 T2와 T3 간의 변화 양상을 각 항목별로 측정하였고, 나이, 성별, Angle 분류, 발치 여부, 유지기간, 초진 시의 상태와의 상관관계를 조사하기 위해 다중 회귀분석을 시행하여 다음과 같은 결과를 얻었다. T2 시기와 비교하여 T3 시기에 ABO-OGS의 7개 항목 중 치아 배열(alignment)은 악화되었으며, 교합 접촉(occlusal contact)과 치간 접촉(interproximal contact)은 개선되었고, 나머지 4개의 항목에서는 유의한 차이가 없었다. 다중 회귀분석을 시행한 결과, 유의한 회귀모형은 치아 배열(alignment), 교합 관계(occlusal relationship), 수평피개(overjet), 치간 접촉(interproximal contact) 항목이었으나, 회귀모형들의 설명력이 낮았으며, 연령, 성별, Angle 분류, 발치 여부, 유지기간, 초진시의 상태(initial PAR index, T1)는 T2 시기와 T3 시기의 ABO-OGS 변화량을 설명하는 데 큰 영향을 미치지는 않는 것으로 보인다. Objective: The purpose of this study was to quantitatively evaluate relapse tendency after orthodontic treatment and determine the contributing factors by using the American Board of Orthodontics objective grading system (ABO-OGS). Methods: The subjects were 80 patients with more than 2 years of retention period after completing orthodontic treatment at the dental hospitals of Busan University, Kyunghee University, and Dankook University. The posttreatment (T2) and post-retention (T3) ABO-OGS measurements were analyzed in relation to age, gender, Angle’s classification, extraction, retention period, and pretreatment condition (initial peer assessment rating (PAR) index, T1) by multiple regression analysis. Results: Among the 7 ABO-OGS criteria, alignment worsened but occlusal contact and interproximal contact improved in T3, but not in T2 (p < 0.01). The 4 other criteria showed no significant differences. Multiple regression analysis showed that alignment, occlusal relationship, overjet, and interproximal contact were significant linear models, but with a low explanation power. Age, gender, Angle’s classification, extraction, retention period, and pretreatment condition (initial PAR index, T1) had little influence on the ABO-OGS changes between T3 and T2. Conclusions: An orthodontist’s understanding of posttreatment relapse tendency can be useful in diagnosis and during patient consultation.

딥 러닝 기반 채널 추정 기법의 V2V 채널 추정 성능 분석

손우성(Woo-Sung Son),한동석(Dong Seog Han) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2

본 논문은 딥 러닝 기반 채널 추정 기법을 활용하여 V2V (vehicle-to-vehicle) 채널 추정 성능을 분석하였다. 기존의 최소제곱법 (least square) 알고리듬 기반의 채널 추정은 복잡도가 낮고 구현이 간단한 장점이 있지만 평균 제곱근 편차 (mean square error) 관점에서 성능이 좋지 않다. 이를 해결하기 위하여 LSTM (long short-term memory)과 양방향 LSTM을 활용한 딥 러닝 아키텍처의 V2V 채널 추정 성능을 모의실험을 통하여 비교 및 분석하였다.

편측성 순, 구개렬자의 상악치렬궁 및 구개에 관한 연구

손우성(Woo-Sung Son),양원식(Won-Sik Yang) 대한치과교정학회 1984 대한치과교정학회지 Vol.14 No.1

A comparative stydy was undertaken to investigate the collapse of maxillary dental arch and palate in unilateral cleft lip and palate indivduals. The material for this study consisted of 39 subjects with repaired unilateral cleft lip and palate (30 males, 9 females). The measurements of unilateral cleft lip and palate individuals were compared with the measurements of normal indiviuals (30 males, 30 females). All the subjects were in the mixed dentition stage and the mean age was almost the same. The following conclusions were obtained. 1. A large number of the maxillary dental arch of the unilateral cleft lip and palate individuals showed Ω-shape, and the arch sighificant difference between cleft group and group, but the intercanine width was mcuh smaller than that of normal individuals. 2. The palate of the unilateral cleft lip and palate subjects showed shorter and shallower form than that of normal subjects. 3. The palate area of the unilateral cleft lip and palate subjects was smaller than that of normal subjects, and the cleft side area was much smaller than the opposing side area. 4. There was no significant sexual difference in measurements of maxillary dental arch and palate of the unilateral cleft lip and palate subjects.

능동 소나 시스템에서 고속 탐색을 위한 신호 송신 기법 분석

손우성(Woo-Sung Son),서영광(Young Kwang Seo),김완진(Wan-Jin Kim),김형남(Hyoung-Nam Kim) 대한전자공학회 2018 전자공학회논문지 Vol.55 No.8

본 논문에서는 수중 환경에서 목표 영역을 빠르게 탐색하기 위한 신호 송신 기법의 탐지 성능과 거리 추정의 결과를 분석한다. 펄스 반복 주기 (PRI, pulse repetition interval) 기반 송신 기법은 레이더와 소나 시스템에서 표적을 탐지하기 위해 사용되는 가장 기본적인 송신 기법이며, PRI 동안 신호를 한 번만 송/수신하므로 목표 영역에 대한 1회 탐색을 수행하는 데 긴 시간이 소요된다. 이러한 문제의 해결 방안으로서, 단일 PRI 동안 모든 빔의 신호를 송신하여 목표 영역에 대한 1회 탐색을 수행할 수 있는 분할된 펄스 길이 (PL, pulse length) 기반 송신 기법과 다중 주파수 기반 송신 기법이 고려되고 있는데, 실제 이들에 대한 특성 및 성능 분석에 대해서는 연구된 결과가 거의 없다. 이러한 측면에서, 본 논문에서는 수중 잔향음 환경과 운동체들의 기동 상황을 반영한 모의실험을 통하여 두 송신 기법을 비교 및 분석하여 다음과 같은 결과를 도출했다. 두 수중 운동체들이 정면 직선 기동할 때 각 송신빔의 에너지가 같다면 두 기법의 탐지 성능은 동일하지만, 다중 주파수 기반 송신 기법에서는 도플러 주파수 추정 오차가 정확한 수신빔의 선택에 영향을 미친다. 두 송신빔의 조향각 사이에 수중 운동체가 존재할 때, 분할된 PL 기반 송신 기법에서는 거리 추정의 오차 범위가 발생하지만, 다중 주파수 기반 송신 기법에서는 발생하지 않으며 표적의 거리를 정확하게 추정할 수 있다. We analyze the detection performance and the distance estimation results of the signal transmission methods which rapidly search the target area in underwater environment. PRI (pulse repetition interval) based transmission method is a basic one used to detect a target in radar and sonar systems. It takes a long time to search target area once, however, since signal is transmitted and received only once during in one PRI. Thus, we introduce the divided PL (pulse length) based transmission method and the multi-frequency based transmission method that can search the target area once by transmitting all signals of beams in one PRI. We compare and analyze the two transmission methods by simulations considering the underwater reverberation environment and maneuver of moving vehicles. If the energy of each beam is the same, the detection performances of the two methods are also equal when the two vehicles maneuvers toward each other. However, the Doppler frequency estimation error affects the accurate selection of the received beam in the multi-frequency based transmission method. When a vehicle exists between the steering angles of adjacent beams, the interval of the range error occurs in the divided PL based transmission method. However, since it does not occur in the multi-frequency based transmission method.