P2P 모델에 기반한 혼합형 파일 검색 알고리즘의 설계

백승재,안진호 京機大學校 2006 論文集 Vol.50 No.-

Recently, peer-to-peer model is more preferable to client-server model in developing file sharing systems because of desirable features of the first such as scalability, anonymity, security, fault-tolerance and so on. However, the most well-known P2P file sharing systems Napster and Gnutella result in some scalability problems, centralized control and broadcasting in file searching, respectively. To address the problems, ultrapeers and dynamic routing techniques were proposed but, cannot still avoid incurring long response times and low recall rates of rare files. This paper presents a hybrid strategy to use existing Gnutella-like techniques for locating popular files and DHT-like techniques for searching rare ones. In particular, we propose an efficient DHT algorithm to structure a node ring consisting of only ultrapeers, not all the nodes. This feature makes the algorithm more scalable than the previous DHT ones in terms of the costs of file search, node join and leave operations and the number of routing table entries each node should maintain.

보디빌딩 선수들의 시합 전·후 신체조성과 체력 및 혈관탄성도 변화와 영양섭취 실태연구

곽재준,박재성,하수민,백영호 釜山大學校 附設 體育科學硏究所 2013 體育科學硏究所 論文集 Vol.30 No.-

The purpose of this study were to investigate a study of body composition, physical fitness, change of vascular compliance and nutrient intake status a before and after bodybuilders match. In this study, participants were 6 bodybuilders. The analyzed data brought about the following results by using paired t-test with SPSS 20.0. The results of the research were as follows. In to body weight and BMI were significantly increased but sit and reach were significantly decreased after match. There was non significantly difference in vascular compliance. Calories, lipids, carbohydrates, fiber and ash had significantly increased after match than before match. Calcium, iron, sodium, potassium, vitamin A, retinol, vitamin B1, vitamin B6, niacin, vitamin C, vitamin E had significantly increased after match than before match. Therefore, Bodybuilders need correct regular diet habit and exercise prescription after match. 본 연구는 B광역시 남자 보디빌딩 선수 6명을 대상으로 신체조성, 체력, 혈관탄성도 및 영양소 섭취상태를 시합 전·후를 분석하는데 목적이 있다. 자료처리는 SPSS 20.0 프로그램을 이용하여 paired t-test를 실시하였고, 연구결과에서 다음과 같은 결론을 얻었다. 시합전에 비해 시합후에 체중과 BMI는 유의하게 증가하였고, 유연성은 유의하게 감소하였고, 혈관탄성도는 유의한 변화가 없었다. 그리고 열량, 지질, 당질, 식이섬유 및 회분은 시합 전 보다 시합 후 유의하게 증가하였다. 또한, 칼슘, 철분, 나트륨, 칼륨, 비타민 A, 레티놀, 비타민 B1, 비타민 B6, 나이아신, 비타민 C, 비타민 E는 시합 전 보다 시합 후 유의하게 증가하였다. 이상을 종합하여 볼 때, 시합 전보다 시합 후에 영양소의 섭취증가로 인해 체중이 증가하는 것을 알 수 있으며, 이상의 연구 결과에서 시합전, 후의 식습관, 맞춤형 운동처방 및 체계적인 컨디셔닝 관리가 요구된다.

실제좌표 공간에서 선형 진동시스템의 해석기법

백승호,황재혁,박명호,이재홍 한국 항공대학교 항공산업기술연구소 1996 航空宇宙産業技術硏究所 硏究誌 Vol.6 No.-

The coefficients of a linear nonconservative system are arbitrary matrices lacking the usual properties of symmetry and definiteness. A method is developed herein for the efficient analysis of linear nonconservative systems. This constructive method utilizes equivalence transformations, and does not require conversion of the equations of motion to first-order forms.

응급의학과 전공의 교육을 위한 제언

백광제,박승희,선경,장연희,엄병선,홍윤식 대한응급의학회 1993 대한응급의학회지 Vol.4 No.2

Although the medical science in Korea has experienced remarkable development, both qualitatively and quantitatively, since its introduction at the beginning of the 20th century, its main focus has been on the expansion of spcialized treatment and medical care in general. However, the fast-paced economic development that started in the 1960's has caused substantial increases in cerbrovascular disease and coronary artery disease while the industrial development and in creased use of means of transportation have resulted in the rapid rise of incidents in external injuries. Consequently, the public has become acutelyh aware of the need for fast and effective emergency transportation and treatemnt. Such awareness also stems from the wide avalilability of medica care which is now established as a basic citizen's right as a result of the national medical insturance system that started in 1977 and was fully implemented in 1989. In response to the public demand for effetive emergency treatments, kthe health care sector has been making serious efforts to deliver better emergency treatments by expanding the emergency facilities and newly offering emergency training programs. Several hospitals have already commenced training programs in order to provide personnel specially trained in that area. The emergency medicine requires not only specialized training in the emergency treatment program in emergency should be designed in order to adapt to the specific needs of the Koreans, as based on epidemiological studies of the nature of emergency cases, its distribution in the population by ages and nature of injury, admission ratio, death rates, etc. currently prevailing in Korea. The present research has been carried out by the Korea university Hospital in preparation of the commencement of the emergency training program in 1994. The research consists of analysis of the emergency cases admitted in the Emergency center of Korea University Hospiatl from January 1992 to December 1992, its distribution, nature, and statistics regarding admission. Based on our research and our review of other available literature on the subject, we make the following suggestions regarding the specialized training program for emergency treatment. 1. The trainees must be required to be also t4rained in the areas of internal medicine surgery, obstetrics and pediatrics. 2. The training in internal medicine should include gastrointestinal, espiratory, cardiovascular medicine and nephrology which the training in surgery should include general surgery, neurosurgery and cardiac surgery. 3. The program should provide training for effective and accurate reading of the radiology. 4. The trainees should be required to participate in actural emergency treatment activities in order to have opportunities to acquire practical skills as well as theoretical knowledge. 5. The program should include course in medical management which would be necessary for effective management and administration of emergency centers and facilities. 6. The continued development of the program would require extensive studies and researches supported by the academic associations of medicine.

랫드 배양배아에서 ginsenosides가 superoxide dismutase 유전자 발현에 미치는 영향

김재승, 이세라, 김연, 연정민, 백인정, 안병우, 김윤배, 이범준, 윤영원, 남상윤 충북대학교 동물의학연구소 2006 Journal of Biomedical and Translational Research Vol.7 No.2

본문참고

정추력을 위한 양측 다분할 여자형 LDM의 고정자 구조 설계

맹인재,백수현,김용,윤신용,이승명 동국대학교 산업기술연구원 2000 산업기술논문집 Vol.11 No.1

본 논문에서는 양측식 가동자석형 LDM을 대상으로, 고정자 권선을 단일 권선으로 성층할 경우 철심의 중앙부분에서 자기포화로 인해 정추력 발생이 어렵다는 단점을 보완하기 위해 고정자 철심을 분할 권선한 다분할 여자형 LDM의 설계방법을 제안한다. 이를 위해 자극과 코일 사이에 작용하는 힘(F)을 수직력(F_y)과 수평력(F_x)으로 나누어 해석하였으며, 영구자석 폭 대 여자권선 폭비를 추력의 왜형 및 리플이 최소화되도록 가변하여 유한요소해석 소프트웨어인 Maxwell-2D를 이용하여 해석하였다. 이러한 결과에 대한 타당성은 양측 다분할 여자형 LDM을 설계 제작함으로써 입증하였다. This paper was designed and analyzed the characteristics of linear DC motor(LDM) that be suitable to long stroke type. But, according to the magnetic saturation in the center core of the excitation coil of the stator, the control of LDM to get the constant thrust force of difficult because of the non-linearity of the inductance and the reluctance by the position of the slider. In this paper, by designing the width of the stator coil, double sided excitation LDM with multi-separated winding which is possible to obtain the constant thrust force is proposed. Using Maxwell 2D, which is the magnetic field analysis package, and proved the validity of design process, also the characteristics of LDM according to the variation of the design parameters of LDM was almost in accord with the experiment result.

Ⅲ급 부정교합의 수술-교정 치료시 상악 소구치 발치가 치열궁 폭경 변화에 미치는 영향

이신재,홍성준,김영호,백승학,서정훈 대한치과교정학회 2005 대한치과교정학회지 Vol.35 No.1

본 연구에서는 Ⅲ급 수술-교정 치료 방법에 영향을 미치는 치열 상의 요소를 파악함으로써 술전 교정시 상악 소구치 발치와 비치의 판단에 필요한 임상적 정보를 얻고자 골격성 Ⅲ급 부정교합 환자의 수술-교정 치료시 흔히 선택되는 상악 제1소구치 발치로 치료된 군과 비발치로 치료된 군 간의 치료전/후 상/하악 개별 치아 이동 양상과 치열궁 폭경의 변화 양상을 비교 분석하였다. 이를 위하여 비발치로 Ⅲ급 수술-교정 치료를 마친 환자 (24명) 와 술전교정 치료시 상악 제1소구치가 발치된 환자 (31명) 의 치료 전/후 모형 상에서 개개 치아의 근원심/협설측 각도변화와 상/하 치열궁 폭경의 변화를 측정한 후, 두 군 사이의 교정적 치아 이동 양상을 비교 분석한 후 상/하 치열궁의 조화를 이루는데 필요한 치열궁 폭경의 변화와 이에 기여하는 치아 변위와의 관계를 분석하기 위하여 상관 분석과 회귀 분석을 시행한 결과 발치 군은 비발치 군에 비하여 상악 치열궁 폭경의 감소가 컸으며, 이는 상악 구치의 inclination 감소에 크게 영향 받은 것으로 관찰되었다. 하악 치열에서는 inclination의 증가와 폭경의 증가가 있었으나, 비발치/발치군간의 차이는 유의하지 않았다. 본 연구의 결과 결론적으로 Ⅲ급 수술-교정 치료시 술전 상악소구치 발치는 상악 구치부 치열궁 폭경의 감소에 크게 영향을 미치므로, 상악 소구치 발치에 대한 판단은 상/하악 치열궁의 폭경 및 구치부 경사도 문제와 연계하여 고려해야 할 사항으로 생각되었다. Collective changes caused by orthodontic tooth movement evaluated in a specific treatment modality could give suggestive information on the specific treatment strategy. The aim of this study was to investigate retrospectively the characteristics of the orthodontic tooth movement during surgical-orthodontic treatment in order to provide an effective presurgical orthodontic treatment planning for the maxillary premolar extraction modality in the skeletal Class Ⅲ malocclusion patient. Pre- and post-treatment dental casts of skeletal Class Ⅲ malocclusion patients with nonextraction (N=24) and the maxillary premolar extraction (N=31) were collected. The angulation and inclination measuring gauge (Invisitech Co. Seoul, Korea) was used to evaluate the orthodontic tooth movement. The changes in the maxillary and mandibular dental arch widths were also measured from the canines to the second molars. As a result, more palatal Inclination change in the maxillary dentition was found with the premolar extraction modality than with the nonextraction modality. Linear regression analysis showed that the inter-arch width coordination was mainly due to the inclination changes of maxillary posterior teeth. We conclude that the indications and proper treatment planning for surgical-orthodontic treatment in skeletal Class Ⅲ malocclusion with maxillary premolar extraction could depend partly on the magnitude of the transverse inter-arch coordination especially in the maxillary dentition.

HPLC 시스템을 이용한 大氣中 多核芳香族 炭化水素의 定量에 關한 硏究

정재필,황승만,박철용,백성옥 嶺南大學校 工業技術硏究所 1991 연구보고 Vol.19 No.1

In this study, an analytical procedure was evaluated for the determination of atmospheric PAH, both in gaseous and particulate phases. The method involves Soxhlet extraction of the filters and Tenax adsorbent, followed by a clean-up stage using a silica mini column prior to analysis by reversephase HPLC with wavelength programmable fluorescence and UV detection. A total of 18 PAH were identified and quantified, all of which have been of environmental concern. In order to validate the methodology and to ensure compatibility of the results, the analytical method used for the determination of PAH was evaluatd with respect to the efficiencies of extraction and clean-up procedure, HPLC separation, and lower limits of detection. In addition, substrate dependency of PAH recovery was also investigated for the two type of filter(glass fiber and PTEF filters) and Tenax adsorbent.

수술-교정 치료 환자의 통제 소재

이신재,안석준,백승학,김태우,장영일,양원식,서정훈,남동석 대한치과교정학회 2002 대한치과교정학회지 Vol.32 No.4

교정치료와 악교정 수술을 필요로 하는 환자가 점증하는 현 시점에 비추어, 이에 대한 기술적인 측면의 발전과는 달리 수술-교정 치료 환자에 대한 정신사회학적 혹은 정신심리적 양상에 대한 객관적인 정보는 그리 많은 주목을 받는 편이 아니었다. 수술-교정치료는 과학적인 치료과정이긴 하지만, 어느 정도 심미적 혹은 예술적인 측면을 지니는 선택 치료의 면모를 지닌다. 그러므로 치료에 대한 환자의 주관적인 느낌은 치료 기술이나 치료의 의학적 성공 여부보다 더 큰 영향을 미칠 수 있다. 그러므로, 수술-교정 (혹은 교정) 치료에 대한 환자의 반응을 예측하기 위한 정신심리적인 정보는 치료에 유용한 지표가 될 수 있다고 가정할 수 있다. 통제 소재에 대한 연구는 인간의 다양한 행동을 예측하기 위한 유용한 지표로 알려져 왔는데, 본 연구에서는 42명의 수술-교정치료 환자와 성별/연령별로 표본 추출된 42명의 통상적 교정치료 환자를 대상으로 삼아 정신=심리적 비교 및 분석의 방법으로 두 가지 종류의 내외 통제 소재(internal/external locus of control) 검사를 시행하였다. 그 결과 수술-교정치료군에서만 남자가 여자에 비하여 낮은 외적 통제(높은 내적 통제)의 경향을 보였다. 결론적으로 수술-교정치료 환자의 정신심리적 기반은 성형 수술 환자와는 달리 교정치료 환자와 유사한 경향을 지닌 것으로 생각되었다. Surgical-orthodontic treatment is an increasingly more common dental procedure whose unique psycho-social or psychological feature has not been fairly quantified objectively. Since the treatment of a surgical-orthodontic (or orthodontic) patient is part science and part art, a subjective recognition of a patient about his or her own treatment may be more important than technical success during and after treatment. Therefore, the knowledge of the patient''s underlying psychological status could be useful in the prediction of patient's response to surgical-orthodontic (or orthodontic) treatment. The purpose of this study was to investigate and evaluate the psychological difference between conventional orthodontic patient and surgical-orthodontic patient by using locus of control (LOC) examination. Locus of control scale has been proven to be extremely useful in the prediction of a variety of human behaviors. Two types of locus of control data (I-score, Internal locus of control score ; E-score, External locus of control score) were obtained for 42 surgical-orthodontic patients and randomly selected 42 conventional orthodontic patients (as a control group) matched for age and gender. No statistically significant difference was observed in the scale of internal and external locus of control between the groups of surgical-orthodontic patients, males showed lower E-score (external locus of control score, higher internal locus of control tendency) than females. The results of this study suggested that the psychological background of surgical-orthodontic patients, in contrast with that of cosmetic surgery patients, has a similar disposition with that of orthodontic patients.

임상교정 교육용 멀티미디어 데이터베이스 웹서버 구축에 관한 연구

박재우,이종기,장영일,남동석,김명기,양원식,김태우,백승학 대한치과교정학회 2000 대한치과교정학회지 Vol.30 No.2

본 연구는 인터넷상의 가상공간에 다양한 자료로 구성된 환자 증례를 통해, 교정을 배우고자 하는 임상의나 학생들의 교육에 필요한 멀티미디어 데이터베이스를 구축하기 위한 것이다. 이러한 시스템을 구현하기 위해서는 이미지 자료의 처리, computer network를 통한 빠른 정보처리 기능, 진단 분석법의 개발, 데이터베이스의 구축 기술, 데이터베이스와 인터넷과의 연계, 증례를 통한 교육방법론과 같은 기술적 문제점들이 있다. 진단과 치료계획을 위한 분석은 모델 분석과 두부방사선 사진분석으로 나누어 제공하였다. 모델분석법은 arch length discrepancy와 Bolton tooth ratio를 환자 정보란에 제공하였다. 두부방사선 사진분석은 초진란에 제공하였다. Cephalometric analysis ver 2.0과 Power Ceph pro 3.3.5를 이용하여 Tweed, Steiner, Jarabak분석법 등을 제공하였으나, 본문에서는 주로 Kim's analysis와 몇 가지 계측치를 추가하여 설명하였고, 나머지는 tracing란에서 제시하였다. 또한 치료 종료 후나 보정란에서 치료 전, 후의 두부방사선 사진을 중첩해서 보여줌으로써 치료에 의한 효과를 직접 볼 수 있도록 하였다. The Objective of this research was to construct the multimedia database system that was necessary for the education of the practitioners and the students. To establish this system, there were technical problems as follows : 1) The processing of the images, 2) The rapid processing of the information with the computer network, 3) The development of diagnosis tools, 4) The technique to establish the database system, 5) The link between the database system and the internet, and 6) The method to educate through many cases. The analysis for diagnosis and treatment planning were provided as two parts : model analysis and cephalometric analysis. As a model analysis, arch length discrepancy and Bolton tooth ratio were provided for the part of patient information. Cephalometric analyses were provided in the part of initial diagnosis. The Cephalometric analysis ver 2.0 and the PowerCeph pro 3.3.5 were used to show Tweed, Steiner and Jarabak analysis. In the main part, Kim's analysis and some measurements were added. In the post-treatment or retention part, we show the superimposition of the cephalometrics with which you can find the effectiveness of the various orthodontic treatment. The address of this home page is "http://damis.snu.ac.kr/orthodontics"