가공의치의 임상 통계적 연구

김승재,Kim, Seung-Jae 대한치과보철학회 1980 대한치과보철학회지 Vol.18 No.1

An investigation was made Into 1,357 fixed bridges which had been performed at the Department of Prosthetic Dentistry, Seoul National University Hospital from 1973 to 1979. The purpose of this investigation was to establish a basic reference of the treatment with fixed bridges by obtaining statistical conclusions from the data concerning the patients who had been treated with fixed bridges. The following conclusions were obtained; 1. The ratio of the fixed bridges made on the maxillae to those made on the mandible was 1:1. 2. The cases of fixed bridges with one pontic were the most frequent, i.e., 946 cases out of total 1,357 cases, which were 69.7% of the total. 3. As the number of missing teeth increased, the number of the relevant cases of fixed bridges decreased. 4. The most frequent age group of the patients who had been treated with fixed bridges was the twenties, which was 40.8% of the total. As the age of the patients increased, the number of corresponding cases of fixed bridges decreased. 5. Most of the fixed bridges with more than three pontics were made at the anterior portion samely on the maxilla and on the mandible. 6. As for the retainers, the porcelain fused to metal crown and the partial veneer crown were frequently used at the anterior portion, while the full veneer crown was frequently used and the inlay and the attachment were used in some cases at the posterior portion. The locations of fixed bridges in the order of their frequency were: canine, lateral incisor, second bicuspid, central incisor, second molar, first bicuspid, first molar, and third molar on the maxilla; second bicuspid, second molar, first bicuspid, first molar, canine, third molar, lateral incisor, and central incisor on the mandible.

돼지 생식기 및 호흡기 증후군 진단을 위한 in situ hybridization 기법의 응용

김승재,박남용,Kim, Seung-jae,Park, Nam-yong 대한수의학회 1997 大韓獸醫學會誌 Vol.37 No.4

We tried to develop detection system of porcine reproductive and respiratory syndrome virus(PRRSV) by in situ hybridization(ISH) in the piglets experimentally infected with KPRRS-2, the Korean isolate(12 piglets) or Mn-1b, the American isolate(4 piglets), and in the natural infection suspected 6 piglets. Twelve 30-days-old piglets(two pigs per each inoculated group) were inoculated by nasal instillation of KPRRS-2 virus(total dose $10^{4.5}TCID_{50}$), Six piglets(one pig per each group) were induced contact infection with inoculated piglets, during the experiment, and two piglets were used as control. Inoculated or contacted piglets were euthanized at 1, 3, 5, 7, 14 and 21 days postinoculation(DPI). The respiratory signs such as coughing and nasal discharge were observed on day 3 DPI, and ear cyanosis were on day 5 DPI, including contacted piglets. Through the necropsy, purple discolorization of dorsal part of lung, and hypertrophy of local lymph nodes were observed. The histopathological lesions of lung were interstitial pneumonia characterized by type 2 pneumocyte hyperplasia. We prepared the probe for ISH by RNA isolation from KPRRS-2, RT-PCR, and biotin labeling. We performed the ISH within only 1~2 hours using $Microprobe^{TM}$ capillary action system. As the results, the strong red specific positive signals, means PRRSV distribution, was mainly observed in the cytoplasm of alveolar macrophages. And also signals were detected in some type 2 pneumocytes and bronchiolar epithelium of lung, myocardium, liver, kidney, tonsil, spleen, gastrointestinal mucosa, testis and lymph nodes.

전자현미경의 이미지 향상을 위한 주사시스템의 안정성

김승재,김동환,Kim, Seung-Jae,Kim, Dong-Hwan 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.1

In a scanning electron microscopy, image distortion is a critical issue and it is needed to be eliminated by some kinds of schemes. In this work, scanning frequency and scanning wave form are adjusted to have an improved image. The relationship between scan coil and its driver is investigated and appropriate frequency and wave form are suggested. It is proved that the selected frequency and wave form showed an enhanced image with less distortion, which were done by experiments. In addition, a noise elimination is addressed, providing improved image with a GROUND signal integration with the amplifier and the scan driver.

Disciplinary Sport Biomechanics : The Effect of Arch Height and AJC ROM on Foot - to - Leg Movement in Heel - Toe Running

김승재,이성철 ( Seung Jae Kim,Sung Cheol Lee ),Benno M . Nigg,Patria A . Hume 한국체육학회 1996 국제스포츠과학 학술대회 Vol.1996 No.2

정교한 데이터 분류를 위한 방법론의 고찰

김승재,김성환,Kim, Seung Jae,Kim, Sung Hwan 조선대학교 기초과학연구원 2021 조선자연과학논문집 Vol.14 No.1

전 세계적으로 인공지능(AI)을 구현하려는 움직임이 많아지고 있다. AI구현에서는 많은 양의 데이터, 목적에 맞는 데이터의 분류 등 데이터의 중요성을 뺄 수 없다. 이러한 데이터를 생성하고 가공하는 기술에는 사물인터넷(IOT)과 빅데이터(Big-data) 분석이 있으며 4차 산업을 이끌어 가는 원동력이라 할 수 있다. 또한 이러한 기술은 국가와 개인 차원에서 많이 활용되고 있으며, 특히나 특정분야에 집결되는 데이터를 기준으로 빅데이터 분석에 활용함으로써 새로운 모델을 발견하고, 그 모델로 새로운 값을 추론하고 예측함으로써 미래비전을 제시하려는 시도가 많아지고 있는 추세이다. 데이터 분석을 통한 결론은 데이터가 가지고 있는 정보의 정확성에 따라 많은 변화를 가져올 수 있으며, 그 변화에 따라 잘못된 결과를 발생시킬 수도 있다. 이렇듯 데이터의 분석은 데이터가 가지는 정보 또는 분석 목적에 맞는 데이터 분류가 매우 중요하다는 것을 알 수 있다. 또한 빅데이터 분석결과 통계량의 신뢰성과 정교함을 얻기 위해서는 각 변수의 의미와 변수들 간의 상관관계, 다중공선성 등을 고려하여 분석해야 한다. 즉, 빅데이터 분석에 앞서 분석목적에 맞도록 데이터의 분류가 잘 이루어지도록 해야 한다. 이에 본 고찰에서는 AI기술을 구현하는 머신러닝(machine learning, ML) 기법에 속하는 분류분석(classification analysis, CA) 중 의사결정트리(decision tree, DT)기법, 랜덤포레스트(random forest, RF)기법, 선형분류분석(linear discriminant analysis, LDA), 이차선형분류분석(quadratic discriminant analysis, QDA)을 이용하여 데이터를 분류한 후 데이터의 분류정도를 평가함으로써 데이터의 분류 분석률 향상을 위한 방안을 모색하려 한다.

스마트 온실 ICT 기자재 표준화에 관한 연구

김승재(Kim Seung Jae),양광호(Yang Kwang Ho),신화영(Shin Hwa Yeong),이명훈(Lee Meong Hun),여현(Yoe Hyun) 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2

스마트 농업 ICT 기자재의 A/S 문제, 상호운용성 저하 등의 표준 부재로 인한 문제가 발생하고 있다. 이를 해결하기 위하여 국내 스마트팜 표준 전문가들이 표준 제정을 위한 활동을 수행하고 있다. 또한 스마트팜 관련 협회에서는 현장 수요에 적합한 표준 안건을 도출하고자 다양한 의견수렴도 진행하고 있다. 본 논문에서는 연간 스마트 온실 분야 ICT 기자재 단체 및 국가표준 현황에 대해 소개하고 스마트팜 관련 협회에서 진행하는 스마트 농업 ICT 기자재 표준기술 적용에 관한 조사 데이터를 토대로 표준 기술의 중요성과 적용 및 확산방안에 대해 논하고자 한다. 표준기술이 확산 및 적용된다면 스마트팜 농가에서 발생한 ICT 기자재 문제들을 해결할 수 있을 것으로 기대되며, 국제 농업 경쟁력 또한 높아질 것으로 기대된다.

생체역학-시장조사-디자인 연속체 개념으로 제작된 원형 맞춤형 발보조기의 효능

김승재(Seung Jae Kim),김장환(Jang Hwan Kim),탁계래(Gye Rae Tack),배상우(Sang Woo Bae) 한국사회체육학회 2008 한국사회체육학회지 Vol.0 No.34

The purpose of this study was to functionally and biomechanically evaluate house shoes foot orthosis (FO), slipper FO, and correctional FO that was designed and made by critical reviews and market research on FO and provide feedback data to make comfortable FO with effective function and economical efficiency. The twenty-two subjects, who were divided into fifteen normals and seven excessive pronators, were recruited for this study. Gait analysis by Vicon system and two Kistler forceplates were performed and important indexes in three-dimensional angular and moment variables of left hip, knee and ankle joint were selected for statistical comparisons among the FOs with respect to control condition. Although all the three designed FO didn`t show any differences in comfort with respect to control condition, indexes in angle and moment showed some differences among them. This suggested that the comfort was able to be independent from changes in biomechanical variables. For the biomechanical evaluation of the FOs the observation of moment index as well as angle index showed meaningful variables. Because the comfort of FOs could be dependent upon foot shape, it would be developed by applying standard foot morphology in Korean when producing basic FO.

온톨로지 기반 스마트 온실 장비 에너지 절감 의사결정 시스템 설계

김승재(Kim Seung Jae),여현(Yoe Hyun) 한국통신학회 2023 한국통신학회 학술대회논문집 Vol.2023 No.11

체육수업에 있어 숙제의 효과 탐색

김승재(Kim Seung Jae) 한국사회체육학회 2003 한국사회체육학회지 Vol.19 No.1

The purpose of this study was to investigate the effects of continuous homework assignment in middle school physical education classes. This study was performed to middle school 1st, 2nd and 3rd grade male students (N=150). Each grade was divided two groups which were the experimental group and the control group. The experimental group was assigned the homework, which the control group was not assigned the homework. A 2×2(control group, experimental group×pre-test, post-test)ANCOVA with baseline performance as the covariate was computed. According to the results, there was significant difference in control group and experimental group. It is considered that the results caused by the characteristics of students and subjects and more studies are required to gain valid results through expanding the task and the subjects.

체육수업에서 학습양식 개념구조의 타당도 검증

김승재 ( Seung Jae Kim ),이경환 ( Kyoung Hwan Lee ) 한국스포츠심리학회 2011 한국스포츠심리학회지 Vol.22 No.1

본 연구의 목적은 일반 학습 상황에서 개발된 GRSLSS(Riechmann & Grasha, 1989)를 체육수업 맥락으로 적용시켜 영역 특수적인 학습양식 척도의 개념적 구조를 검증하는 것이다. 1,266명의 남녀 중고등학생이 본 연구에 참여하였으며, 수집된 자료에 대하여 기술통계, 탐색적 요인분석, 신뢰도 분석, 상관분석 및 다집단 분석이 실시되었다. 확인적 요인분석의 결과 체육수업 맥락에서 6가지 학습양식(장독립적/장의존적, 회피적/참여적, 협력적/경쟁적)의 개념적 구조가 존재하고 있다는 사실이 확인되었다. 6요인 39문항으로 구성된 체육 학습양식 척도의 시간적 안정성과 내적동기를 이용한 예측 타당도가 검증되었다. 다집단 분석의 결과 성별과 학년급간 구인 동등성이 검증되었으며, 성별간 잠재평균 차이가 장의존적 요인을 제외하고 모든 요인에서 나타났다. 본 결과는 기존의 학습양식에 관한 결과와 교육적 시사점과 관련하여 논의되었다. The purpose of this study was to examine a conceptual structure of domain-specific learning style scale which modified GRSLSS (Riechmann & Grasha, 1989) developed in general learning contexts into physical education classes contexts. 1,266 boys and girls secondary school students participated in this study, and for analyzing data descriptive statistics, exploratory factor analysis, reliability test, correlation analysis, and multi-group analysis were conducted. The results of confirmatory factor analysis indicated that conceptual constructs of six learning styles (field-independent/field-dependent, avoidant/participant, collaborative/competitive) existed in physical education settings. Both temporal stability of learning style scale in physical education settings consisting of six factors with thirty-nine items and its predictive validity using intrinsic motivation were examined. The results of multi-group analysis showed that factorial invariance across gender and grades were identified and the differences of latent mean were existed in all sub-factors except field-dependent. The results were discussed in relation to previous results of learning styles and its educational implication.