교통안전을 위한 차선과 신호등에 관한 연구

崔昌洽,許寬會 成均館大學校 科學技術硏究所 1991 論文集 Vol.42 No.1

This paper study on lanes and signals in traffic safety symbols. In lanes the color and line are very important factors that give driver a direction and signal. Hence wrong-used color and line give driver confusion which cause traffic accident. According to this point at issue we deal with one way road, parking-stoping prohibition lane, lane change prohibition sign safety Zone and variable lane. In signals we have signal cycle improved so that fit continuous traffic flow and drivers can afford to cope with signal change, and deal with an yellow on-and-off light that stand on the intersection at midnight. The method is the analysis of the road traffic laws in force and questionaire for drivers in order to search the point at issue.

LDA 알고리즘을 이용한 프랜차이즈 연구 동향에 대한 토픽모델링 분석

양회창(Hoe-Chang YANG) 한국프랜차이즈경영학회 2021 프랜차이즈경영연구 Vol.12 No.4

Purpose: This study aimed to derive clues for the franchise industry to overcome difficulties such as various legal regulations and social responsibility demands and to continuously develop by analyzing the research trends related to franchises published in Korea. Research design, data and methodology: As a result of searching for franchise in ScienceON, abstracts were collected from papers published in domestic academic journals from 1994 to June 2021. Keywords were extracted from the abstracts of 1,110 valid papers, and after pre-processing, keyword analysis, TF-IDF analysis, and topic modeling using LDA algorithm, along with trend analysis of the top 20 words in TF-IDF by year group was carried out using the R-package. Results: As a result of keyword analysis, it was found that businesses and brands were the subjects of research related to franchises, and interest in service and satisfaction was considerable, and food and coffee were prominently studied as industries. As a result of TF-IDF calculation, it was found that brand, satisfaction, franchisor, and coffee were ranked at the top. As a result of LDA-based topic modeling, a total of 12 topics including “growth strategy” were derived and visualized with LDAvis. On the other hand, the areas of Topic 1 (growth strategy) and Topic 9 (organizational culture), Topic 4 (consumption experience) and Topic 6 (contribution and loyalty), Topic 7 (brand image) and Topic 10 (commercial area) overlap significantly. Finally, the trend analysis results for the top 20 keywords with high TF-IDF showed that 10 keywords such as quality, brand, food, and trust would be more utilized overall. Conclusions: Through the results of this study, the direction of interest in the franchise industry was confirmed, and it was found that it was necessary to find a clue for continuous growth through research in more diverse fields. And it was also considered an important finding to suggest a technique that can supplement the problems of topic trend analysis. Therefore, the results of this study show that researchers will gain significant insights from the perspectives related to the selection of research topics, and practitioners from the perspectives related to future franchise changes.

CT 영상을 이용한 악골 골수염의 경조직 변화에 관한 연구

안창현,최보람,허경회,이원진,이삼선,최순철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.3

Purpose : To assess the clinical findings and hard tissue changes of osteomyelitis of the jaws using computed tomographic (CT) image analysis. Materials and Methods : We reviewed and interpreted the CT images of 163 patients (64 males and 99 females, age range from 10 to 87 years) who visited the Seoul National University Dental Hospital from April 23, 2006 to December 31, 2008 and were diagnosed as osteomyelitis of the jaws through clinical, radiologic, and histopathologic examination. Each CT findings was investigated for frequency, correlation with age and gender. Results : Of the 163 patients, 31 (19.0%) were affected on the maxilla, 135 (82.8%) were affected on the mandible, and 3 (1.8%) were affected on the both jaws simultaneously. The mean age of the patients who were affected on the maxilla was 61.0 years and that of the patients who were affected on the mandible was 56.2 years. On the maxilla, the most frequent site of disease was the posterior area (83.9%) and on the mandible, mandibular body (83.0%), followed by angle (48.1%), ramus (38.5%), condyle (13.3%), incisal area (9.6%), and coronoid process (3.0%). Among the 31 maxillary osteomyelitis, defect in the trabecular bone was observed in 28 (90.3%), osteosclerosis 20 (64.5%), defect in the cortical bone 27 (87.1%), sequestrum 17 (54.8%), and periosteal reaction 2 (6.5%). Among the 135 mandibular osteomyelitis, defect in the trabecular bone was observed in 100 (74.1%), osteosclerosis 104 (77.0%), defect in the cortical bone 116 (85.9%), sequestrum 36 (26.7%), and periosteal reaction 67 (49.6%). Conclusion : Of our cases, the maxillary osteomyelitis was visibly observed more frequently in females than males. The incidence is the highest in seventies (28.8%) and the lowest in teens (3.1%). The osteomyelitis of the jaws was observed more frequently in males than females before the age of 50, and observed more frequently in females after the age of 50. The most noticeable point was that the sequestrum was observed more often on maxillary osteomyelitis and the periosteal reaction was observed more often on mandibular osteomyelitis. (Korean J Oral Maxillofac Radiol 2009; 39 : 163-8)

원룸형 주택의 불편사항 및 하자 분석

정회창, 방홍순, 김옥규 충북대학교 건설기술연구소 2018 建設技術論文集 Vol.37 No.2

본문 참조

골반경수술의 임상적 고찰

강민창,조혜진,최상준,한세준,정혁 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

Objective: Pelviscopic surgery has been used in the treatment of some gynecologic disease. And now, it is applied in almost all cases of gynecologic disease. This study is performed to evaluate the clinical advantages of pelviscopic surgery and current circumstance of ORGY of chosun university hospital. Methods: From March, 2000 to February 2003, total 437 cases were received laparoscopic surgery on department of ORGY of Chosun University hospital. We reviewed the chart and analyzed these cases according to age, parity, clinical indication, operation type, duration of hospitalization, operation time and complication. Results: The results are summarized as follows, The mean age of patients was 42.5 years old with ranges between 15 and 61 years old and mean parity of the patients was 1.95. The common indications were uterine myoma (45.1%) , ovarian tumor (15.3%) and ectopic pregnancy (7.3%) and frequent types of surgery were laparoscopic assisted vaginal hysterectomy (LAVH) (46.9%) , salpingectomy (8.5%), oophorectomy (8.5%). The operation time was variable according to types of operation and difficulty and the mean duration of hospitalization was 4.27 days. The most frequent complication was hemorrhage at the trocar site. Conclusion: Pelviscopic surgery is useful and recommended for the treatment of gynecologic disease, because this is safe and has many advantages. So, we expect the number and indication of pelviscopic surgery will be increased in future. 목적 : 진단목적으로 시행되어오던 골반경 수술이 부인과 질환의 거의 모든 영역에서 적용되어있다. 이에 골반경 수술의 임상적 이점에 대해 알아보고자 본 연구를 시행하였다. 연구방법 : 2000년 3월부터 2003년 2월가지 조선대학교 병원 산부인과에서 골반경 수술을 시행 받은 437명의 외래 및 입원기록을 검토하여 환자의 연령, 출산력, 골반경수술의 적응증, 수술종류 및 시간, 입원기간, 합병증을 분석하였다. 결과 : 2000년 3월부터 2003년 2월까지 시행한 437예의 골반경수술을 분석하여 다음과 같은 결과를 얻었다. 환자들의 평균연령분포는 15세에서 61세 사이였고 평균 연령은 42.5세이었다. 평균 출산력은 1.95회이었다. 골반경 수술은 LAVH가 205예 (46.9%) 로 가장 많았고, 난관 절제술이 37예 (8.5%), 난소 적출술이 35예 (8.%), 난소부분절제술이 28예(6.4%) 이었다. 골반경 수술의 적응증은 자궁외 임신이 43예(86%), 자궁근종이 197예(61.2%), 난소종양이 82예(52.6%) 이었다. 수술시간은 수술의 종류 및 난이도에 따라 다양하였다. LAVH의 경우 평균 38.2분, 난소난관 절제술의 경우 평균 31.9분, 난관 절제술의 경우 평균 30.7분이 소요 되었다. 평균 실혈량은 LAVH가 1.16g/dl, 난관절제술은 0.94g/dl, 난소난관 절제술의 경우는 0.97g/dl이었다. 입원기간은 대부분 1일에서 5일 사이였으며, 평균 4.27일 이었다. 가장 많은 합병증은 트로카 천공부위 출혈이었다. 결론 : 본 연구의 결과로 골반경 수술은 현재 부인과 질환의 진단과 치료에 있어서 매우 유용하며 개복 수술을 대치하는 상황으로 나아가고 있다.

忠南大學校 學生들의 生活實態 調査

金忠會,徐昌源,片瑞英 충남대학교 1984 學生生活硏究 Vol.11 No.-

He 원자 구조에 관한 수치 해석적 연구

양희룡,최승평,장차익 조선대학교 기초과학연구소 1997 自然科學硏究 Vol.20 No.1

The one-electron theory of atoms, molecules, and crystals has enjoyed a wide success in many branches of physics. This theory provides a physically appealing description of the eletronic structure of many-electron systems. In addition, this theory provides a convenient basis for performing the detailed calculations on specific many-electron systems. In such calculations, it is usually necessary to introduce many simplifying assumptions in order to make a progress. Since the principal computational difficulty posed by the Hartree-Fock equations is the treatment of the exchange terms, it would be very desirable to simplify the treatment of these terms by using Slater's the average of the exchange potential. The first order correction of the energy in the ground state of He atom is calculated by using the unperturbed wave function obtained with the Hartree-Fock-Slater approximation and compared with the result obtained by the simple analytical metod. The numerical result agrees with an experimental result for the ground state of the He atom with tolerance 0.65%.

Langerhans cell histiocytosis

장창덕,허준,박성환,김철훈,오수진,황희성,최설희,신상훈 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4

Langerhans cell histiocytosis(LCH) appears to arise from Langerhans cell and comprises a spectrum of clinical disease previously described in the literature by a variety of eponyms including histiocytosis X, eosinophilic granuloma, Hand-Christian disease, and Letterer Siwe syndrome. This rare disorder occurs in all groups, predominently affecting children & young adults. LCH has a wide spectrum of clinical features. The differentiation of several forms of this disease is primarily a clinical and not a histologic one. The radiographic characteristics include the appearance of solitary "intraosseous" lesios, the multipicity of "alveolar bone" lesions, the bone lesions, periosteal new bone formation, and slight root resorption. Prognosis of a single bone lesion, is known to be excellent. In contrast, disseminated disease has seen associated with a chronic course, a high rate of morbidity and late consequences, and possible mortality. Treatment of LCH remains problematic. Treatment of multisystem disease, where organ function is being compromised has generally been with high-dose systemic corticosteroids or multiple chemotherapy.

UWB band CMOS QVCO 설계

구광희,김창우 경희-다반 ASIC 설계교육센터 2007 경희-다반 ASIC센터 논문집 Vol.8 No.-

A quadrature voltage controlled oscillator(QVCO) with MOS-varactors has been designed for UWB applications. The QVCO consists of two cross-coupled differential cores. Using the TSMC CMOS libraries, harmonic balance simulation has been performed with the Agilent's ADS. The QVCO exhibits the frequency tuning range from 7.03 GHz to 10.25 GHz with phase noise from -95 dBc/Hz to -105 dBc/Hz at an 1 MIIz-offset frequency. The total current through the core is 28 mA.

모델원자들에 의한 전자 산란 단면적 계산

정진,양회룡,최승평,장차익 조선대학교 기초과학연구소 1998 自然科學硏究 Vol.21 No.1

The scattering cross section in model atom is the physical quantity which is susceptible of a reasonably direct experimental measurement and which at the same time lends itself readily to calculation, and which establish contact between scattering theory and scattering experiment to assist each other. We have calculated the differential cross section and total cross sections of electrons by targets which are Cu, S, He, Ne, Ar on the ground state without the targets distortion with the Born approximation and the Eikonal approximation. the electron energies are in the range up to about 1.3 ev∼10 kev. The potential used to represent the interaction between atom and electron in our calculation is the same as that is used by Lens-Jensen in the evaluation of the cross-sections. We used the Gauss Legndre quadrature for our numerical integration in our differential equations.