Bezier Spline을 이용한 용접 로봇의 새로운 Weaving Motion 궤적 생성 알고리즘

정원지,김대영,서영교,홍형표,홍대선 한국공작기계학회 2004 한국생산제조학회지 Vol.13 No.3

In this paper, we propose a new weaving trajectory algorithm for the are welding of a articulated manipulator. The algorithm uses the theory of Bezier spline. We make a comparison between the conventional algorithms using Catmull-Rom curve and the new algorithms using Bezier spline. The proposed algorithm has been evaluated based on the MATLAB environment in order to illustrate its good performance. Through simulations, the proposed algorithm can result in high-speed and flexible weaving trajectory planning so that it s trajectory cannot penetrate into a base metal compared to the conventional algorithm using Catmull-Rom curve.

획을 이용한 소형 전자기기용 한글 입력 시스템

정영준,엄종진,박민현,한욱표 강원대학교 정보통신연구소 2007 정보통신논문지 Vol.11 No.-

With advance of cellular phone technologies, the use of short message transmission with small or portable electronic devices has been explosively increasing. In spite of such demands there have been not many studies for Korean characters and their symbol combinations (below "Hangul"). While some other studies have been focused on the Hangul vowel, in this paper we proposed a new Hangul input system which presents Hangul consonants with basic symbol components (called as "hweok"). And we have performed performance evaluation with comparison to SK's Chunjiin and LG's Naragul in terms of the number of key buttons, finger moving distance and key strokes. The proposed system can make all of Korean characters with 5 or 6 Hangul hweoks without significant degradation of system performance.

인터넷 의료상담에 관한 분석 및 연구

김영조,박홍표,정병수,최규철 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1

Background and Objectives: Telemedicine uses computer and telecommunication technologies to provide medical information and services. Telemedicine can be useful in any situation in which there is a physical barrier between the doctor and the patient. We analyzed medical consultations from Chosun University Hospital is home page (http://hosp.chosun.ac.kr) to find problems on the home page and to offer high quality medical information services. Methods : We collected 544 queries of medical consultation on our home page from May 1998 to May 1999. From medical consultation data on the internet web site of Chosun University Hospital, consulted documents were analyzed with regard to medical department, patients’ age, consultation by attorney, and dermatologic consultations. Results : The telemedicine system is a relatively satisfactory method to both patients and physicians due to easier access and almost rea1-time medical consultation through the world wide web. But several problems should be solved to provide a more effective and lawful telemedicine environment. Conclusion : As a consequence to analyzed medical consultations on our home page, there were several problems in our store-and-forwarding system. To establish an effective telemedicine system, we have to prepare protocols to receive sufficient information and patients have to send digital images to make help an accurate diagnosis. Also problems of liability, reimbursement and coordinated national policy need to be solved.

무선 센서 네트워크를 위한 효율적인 에너지 인식 라우팅 프로토콜

한욱표,정영준 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-

The efficient node-energy utilization in wireless sensor networks has been studied because sensor nodes operate with limited battery power. To extend the lifetime of the wireless sensor networks, we reduced the node energy consumption of the overall network while maintaining all sensors balanced node power use. Since a large number of sensor nodes are densely deployed and cooperated in wireless sensor network, the lifetime extension of a sensor network is maintained by keeping many sensor nodes alive. In this paper, we submit an efficient energy aware routing portocol for wireless sensor networks to increase its lifetime without degrading network performance. The proposed protocol is designed to avoid traffic congestion on specific nodes at data transfer and to make the node power consumption widely distributed to increase the lifetime of the network. The performance of the proposed protocol has been examined and evaluated with the NS-1 simulator in terms of network lifetime and end-to-end delay.

이비인후과 영역의 급성염증성질환 치료에 대한 Azithromycin의 임상연구

김영호,정명현,홍원표,강상훈 최신의학사 1994 最新醫學 Vol.37 No.4

Calcium Carbonate와 fibrin adhesive의 병용이 성견 2급 치근분지부 치주조직 재생에 미치는 영향

서은표,정현주,김영준 전남대학교 치과대학 2000 전남치대논문집 Vol.12 No.1

The purpose of this study was to evaluate the effect of combined use of fibrin tissue adhesive and porous resorbable calcium carbonate on the periodontal regeneration of the class Ⅱ furcation defects in dogs. Class Ⅱ furcation defect was surgically created on the second, third, and fourth premolars bilaterally in the mandibles of six mongrel dogs. The experimental sites were divided into four groups according to the treatment modalities: Control-surgical debridement only; GroupⅠ-calcium carbonate grafting; Group Ⅱ-application of fibrin adhesive only; Group Ⅲ-application of fibrin adhesive after calcium carbonate grafting. The animals were sacrificed at 2, 4, and 12 weeks after periodontal surgery and the decalcified specimens were prepared for histologic and histometric examination. The results are as follows : Clinically, there were no inflammatory response in all groups after 2, 4, and 12 weeks. In the Control group, junctional epithelium migrated apically to the reference notch. In Group Ⅰ, graft materials exfoliated from the defect throughout the experimental periods and new bone was seen in the notch area at 4 and 12 weeks' specimens. At 2 weeks, fibrin adhesive was indistinguishable in Group Ⅱ. In Group Ⅲ, the graft material was maintained in the defect throughout the experimental periods and the amount of periodontal tissue regeneration was greater than other groups. These results suggest that the use of fibrin tissue adhesive in conjunction with porous resorbable calcium carbonate would improve the stability of graft material and inhibit the epithelial downgrowth and contribute to periodontal regeneration.

구순열 및 구개열 환자에 대한 Toxoplasma항체의 혈청학적 연구

심영기,이세일,홍인표,정평림,장효죽 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1

The etiology of the cleft lip and palate can be explained with a multifarious theory. According to articles, there are some relationships between congenital toxoplasmosis and the cleft lip&palate, but the direct relationships is not obvious. Therefore, this research aims to find the difference of the serum toxoplasma antibody titer between 172 cleft patients who have been treated at National Medical Center and their mother group of 81 cases, healthy control group of 150 cases. The antibody titer was identified by the indirect fluorescent antibody test(>16)and the enzyme-linked immunosorbent assay(>0.3). The results are as follow : 1. By ELISA, the positive rate of the cleft patients(8.1%, 14cases)and that of the mother group(9.9%, 8cases)is higher than the healthy control group(2.7%, 4cases)(p<0.05). 2. By IFAT, the positive rate of the cleft patients(10.5%, 18cases)is higher than the healthy control group(5.3%, 8cases), but the difference is not significant(p>0.05). And the positive rate of the mother group(13.6%, 11cases)is higher than the healthy control group(5.3%, 8cases)(p<0.05). 3. By ELISA and IFAT, the positive rate of the mother group is higher than the cleft patient but the difference is not significant. 4. By ELISA and IFAT, the positive rate of the cleft patients according to the clincal group is not significant. 5. By ELISA and IFAT, the positive rate of the chronic disease group(17.3% & 27.7%)is higher than the healthy control group(2.7% & 5.3%)(p<0.05).

관상동맥 풍선성형술 후 발생한 관상동맥 박리의 초기 조영술적 고찰

고영엽,강지인,장재혁,강민정,정중화,장경식,홍순표 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

Background and Objectives: Percutaneous coronary intervention (PCI) is widely utilized in the treatment of symptomatic coronary artery disease (CAD). Althouth it has numerous benefits, intimal tear or dissection, serious and potentially life-threatening complications of plain old balloon angioplasty (POBA) can occur. The aim of this study was to assess the implications of coronary dissections after ballon angioplasty. Methods: 78 consecutive patients (age, 62 +/- 11 years; 46 men, 32 women) identified to two groups as having with or without dissection (dissection (D) group or non-dissection (ND) grouP) underwent balloon angioplsty for CAD were studied. All patients with dissection could be managed by successful stent implantation to rescue the artery. The morbidity of ischemic complication and mortality were evaluated for 30days after PCI. Results: Coronary dissection developed 44 lesions (38%) in 31 patients out of 117 lesions in 78 patients after POBA and a good final angiographic result was obtained in all patients with dissection, Significant correlates of a development of dissection were the lesion morphology of ACC/AHA type B and C (P<0.05). There were no significant correlations of clinical pictures, whether POBA in single vessel disease or in multivessel disease, diameter stenosis before POBA, and balloon/coronary artery diameter ratio. Morphologic feature of dissection was type A in 15 (34%), type B in 13(30%), type C in 12 (27%), and type D in 4 (9%). After PCI, there was no ischemic complication or death related coronary dissection during follow-up period for 30days. Conclusions: Coronary dissection after angioplasty occurred in 44 lesions (38%) out of 117 lesions of 78 consecutive patients underwent POBA. Coronary dissection after POBA significantly correlated with the severity of lesion morphology. Coronary stenting is effective in the management of acute coronary dissections after angioplasty.

珪酸마그네슘의 合成條件에 關한 硏究

전우정,신화우,최광식,안세민,이광표,장영수 원광대학교 식품약품안전성연구소 1993 食品藥品安全性硏究 Vol.6 No.-

Magesium twisilicate is mainly uaed as a nonsytemic antacid andabsrbent. Magnesium trisilicate when teeated with anacid sxuh as diluted hydrochloric acid in gastric juice decomposes to form Magnesium chloride and colloidal Silicates. 2MgO·3SiO_2 + 4Hcl - 2MgCl_2 + H_4Si_3O_8 (or 3SiO_2 + 2H_2O) Colloidal mixture The resultng colloidal silicates can protect ahe ulcer frdm further acid and peptic attack and possibly adsorb the pepsin. It is well known that yield of Magnesium trisilcate produced is greatly affected by the Synthesis condition such as the reactant concentration, reaction temperature and moleatio of reactant solutions as well as by the emperature at which the precipitate is dried and the temperature of washing water, etc. The purpose of this study is to investigate the optimum synthesis conditions of Magnesium trisilicate. A randomized complete block design suggested by G.E.P. Bdx and K.B. Wagnesium sulfate solution with Sodium silicate solution in this study. It was found that optimal synthesis conditidns were: Reaction temperature range : 57-90 ℃. Concentration range of reactants (Sodium silicate and Magnesium sulfate) : 19.1-29% molar ratio of the reactants. [Sodium silicate]/[Magnesium sulfate]: 1.47-1.80. temperature range of washing water: 45-48℃ and drying temperature range: 65-82℃ The antacidic activity of five Magnesium trisilicate samples which shows the maximum antacidic efficacy was tested by pharmacopeia acid consuming capacity test. The five Magnesium trisilicate samples were samples were identified by chemical analysis.

골다공증 환자의 치주조직 상태

박성표,김영준,정현주,박병주 전남대학교 치과대학 1999 전남치대논문집 Vol.11 No.1

The purpose of this study was to evaluate the relationship between osteoporosis and periodontal condition in postmenopausal women. Twenty-eight patients who have been treated at Chonnam nationa university hospital with osteoporosis(osteoporotic group, mean age 62.2±6.6) and 21 normal postmenopausal women with periodontitis(control group, mean age 60.4±3.7) were examined. Bone mineral density(BMD) of lumbar spine(L2-L4) was measured by dual energy X-ray absorptiomemtry(DEXA). Percentage to peaked bone mass in osteoporotic group was 70.9% which had lower BMD than in control group(p<0.05). The number of present teeth were 23.6 in osteoporotic group and 23.1 in control group. Percentage of bleeding on probing was 41% in osteoporotic group and 37% in control group. probing depth and attachment level were shown 3.18 mm, 3.63 mm in osteoporotic group and 2.85 mm, 3.11 mm in control group, respectively. probing depth and attachment level were significant greater in osteoporotic group than in control group(p<0.05). The significant negative correlation was found between BMD level and periodontal attachment level(p<0.001, γ=-0.56). These results suggest that osteoporosis may be associated with periodontal breakdown.