CAM과 4-way memory를 사용한 IPv6 주소 검색 하드웨어 구조

박상억 연세대학교 대학원 2005 국내석사

파노라마 X선사진을 이용한 치아수 이상에 관한 연구

박상억 경북대학교 1992 국내석사

경북대학병원 치과에 내원한 8세에서 27세까지의 환자 6,531명의 파노라마 X선사진에서 제3대구치를 제외한 선천성 결손치, 제3대구치의 선천성 결손, 과잉치의 발생율: 성별분포, 호발부위 및 수에 따른 분포를 조사하여 다음의 결과를 얻었다. 제3대구치를 제외한 선천성 결손치의 발생율은 10.8%였으며, 남성이 44.6%, 여성이 55.4%였다. 하악 제2소구치가 23.2%로 가장 많았으며, 상악 측절치 18.4%, 하악 측절치 18.3%, 상악 제2소구치 15.4%의 순으로 나타났다. 결손치의 수는 l개인 경우가 48%로 가장 많았으며, 2개인 경우가 35.4%, 3개인 경우가 6.6%로 나타났다. 제3대구치 선천성 결손의 발생율은 39.7%,였으며, 남성이 48.6%, 여성이 51.4%였고, 상악이 60.3%, 하악이 39.7%였다. 결손치의 수는 l개인 경우가 28.7%, 2개인 경우가 37.2%, 3개인 경우가 12.5%, 4개인 경우가 21.6%로 나타났다. 과잉치의 발생율은 4.2%였으며, 남성이 65.7%, 여성이 34.3%였다. 상악 중절치부가 64.8%로 가장 많았으며, 상악 측절치부 13.2%, 상악 제3대구치 후방부 8.7%의 순으로 나타났다. 과잉치의 수는 l개인 경우가 79.9%로 가장 많았고, 2개인 경우가 18.9%, 3개인 경우가 1.2%로 나타났다. The purpose of this study was to evaluate the prevalence and distribution of tooth number anomaly by means of the analysis of panoramic radiographs in 6,531 patients visited the Dental Infirmary of Kyungpook National University Hospital from January 1983 to May 1992. The results were as follows: The prevalence of congenitally missing teeth except third molar was revealed to be 10.8%, and there was a higher prevalence in females(44.6%) than in males(55.4%). Mandibular 2nd premolars(23.2%) were absent most frequently, followed by maxillary lateral incisors(18.4%), marxlibular lateral incisors (18.3%), and maxillary second premolars(15.4%) in descending order of frequency. As to the number of congenitally missing teeth, the percentage of missing one tooth was 48%, missing two teeth was 35.4%, missing three teeth was 6.6%. The prevalence of congenitally missing third molars was revealed to be 39.7%. There was a higher prevalence in the maxilla(60.3%) than in the mandible(39.7%). Maxillary right 3rd molars(30.6%) were absent most frequently, followed by maxillary left 3rd molar(29.7%), mandibular right and molar(20.2%), mandibular left 3rd molar(19.5%) in descending order of frequency. The prevalence of supernumerary teeth were revealed to be 4.2%, and there were a higher prevalence in males(66.7%) than in females(34.3%). They were found most frequently in maxillary central incisor area(64.8%), followed by maxillary lateral incisor area(13.2%), posterior area of maxillary third molar(8.7%) in descending order of frequency. As to the number of supernumerary teeth: The percentage of one supernumerary tooth was 79.9%, two supernumerary tech was 8.9%, three supernumerary tech was 1.2%.

IT기업의 조직 구조 변화에 관한 연구

박상억 한림대학교 대학원 2000 국내석사

This study deals with the change of organizational structure in the Information Technology(IT) firms with a dynamic point of view. Organizational studies generally consider technology, size, market situation etc. as factors which affect organizational structure. This thesis focuses on the internal logic of size effect on organizational structure, relatively contrasting it to technology effect. Passing through the life cycles of organization, it is argued, firm tends to have different proportions of classes within its organization, which is caused by varying productivity of each class at different stage of life cycle. Then, the distributional aspect of classes as well as the total size of firm affect characteristics(formalization, centralization, complexity) of organizational structure in a process to solve incentive and arbitration problems within organizational hierarchy. To test the theoretical hypothesis of the class-mediated size effect on organizational characteristics, empirical data are collected through on-line survey from 222 IT firms and are subjected to inferential statistical analyses. The following conclusions are deduced from the results of data analysis: First, firms have a different organizational structure in each life cycle. So organizational structure is not fixed, and life cycle is as an important and independent variable as technology in determining the organizational structure.. Second, the conventional argument that the organizational structure of firms in new industry is different as compared to that of manufacturing firms has some limit. Information technology itself is no longer effective factor to distinguish organizational structure between "new" and "old" industries in these days, because even "old" industries already have adapted information technology. Third, the class relations and the distributional aspect of classes have significant influence on organizational structure, triggering and mediating the size effect. The dynamics on class relations within organization, which has been relatively neglected in previous organization studies, should be listed on agenda for explaining the organizational structural change.

치의학대학원 학생들의 장애환자에 대한 인식 조사

박상억 서울대학교 치의학대학원 2014 국내석사

본 연구의 목적은 치의학대학원 학생을 대상으로 장애인에 대한 일반적인 태도, 장애인치과학 교육과정, 장애인치과 및 진료에 대한 인식을 조사하여 현재 치의학대학원에서 진행되는 장애인치과학 교육에 관한 치의학대원생의 인식수준을 파악하고 추후 교육과정의 개발에 기초를 제공하고자 함이다. 이에 따라 서울대학교 치의학대학원 14 학년 학생 총 297명을 대상으로 설문조사를 시행하였고 다음과 같은 결론을 얻을 수 있었다. 1. 장애인에 관한 일반적인 인식에 대해서는 학년에 따른 유의미한 차이가 발견되지 않았다. 2. 장애인치과학 교육 및 장애인 진료에 대해 대체로 긍정적인 태도를 보이며 학년이 증가함에 따라 더 높은 이해도와 만족도를 보였다. 3. 졸업 후 장애인 진료를 할 것인지, 장애인 진료 관련 전문 교육프로그램의 이수 여부에 대해서는 대체로 회의적인 태도를 보였다.

백서에 있어서 저작운동의 발달에 따른 깨물근지배 운동신경원에 연접하는 억제성 종말의 연접양식의 변화

박 상억 경북대학교 대학원 2004 국내박사

Synaptic connectivity of the masticatory motoneurons innervating jaw muscles during development has been studied little. This study was aimed to clarify central mechanism for jaw movement during postnatal development and investigated the development of synaptic organization of motoneurons innervating masticatory muscles. Masticatory motoneurons of 1 day-, 10 days- and 30 days-old rats were labeled by injection of horseradish peroxidase into the masticatory muscles. Brain stem was removed and processed for electron microscopy. Postembedding immunogold labeling was performed with antibodies against inhibitory and excitatory neurotransmitters. A total of 206, 350 and 497 boutons apposing on each 8 somata of masseteric motoneurons in groups of 1 day-, 10 days- and 30 days-old rats were analyzed. Mean length of boutons significantly increased during postnatal development. Percentage of synaptic covering also significantly increased during postnatal development. There was no significant difference in packing density among the three age groups. Boutons IR to GABA or glycine usually contained mixture of flattened, oval and round vesicles whereas, boutons IR to glutamate usually contained spherical synaptic vesicles. In case, where synaptic structure could be clearly observed, GABA and/or glycine IR boutons frequently showed symmetrical type of synaptic contact with postsynaptic membrane. In 1 day and 10 days groups of sucking phase there was no significant difference in proportion of bouton profiles among GABA IR, glycine IR, and both GABA and glycine IR boutons. Whereas in 30 days group of masticatory phase, proportion of GABA IR bouton was decreased, but that of glycine IR bouton increased significantly. Synaptic covering percentage increased in GABA IR bouton of 10 days group and glycine IR boutons of 30 days group. There was no change in proportion of inhibitory and excitatory boutons with development. These results show morphological evidence of rearrangement of inhibitory synaptic input to the jaw closing motoneurons during development of jaw movement.