3차원 전산화단층촬영 영상을 이용한 안면 연조직 두께 계측의 임상적 유용성

정호걸,김기덕,한승호,허경석,이제범,박혁,최성호,김종관,박창서 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.36 No.2

Purpose : To evaluate clinical usefulness of facial soft tissue thickness measurement using 3D computed tomographic images. Materials and Methods : One cadaver that had sound facial soft tissues was chosen for the study. The cadaver was scanned with a Helical CT under following scanning protocols about slice thickness and table speed; 3 mm and 3 mm/sec, 5 mm and 5 mm/sec, 7 mm and 7 mm/sec. The acquired data were reconstructed 1.5, 2.5, 3.5 mm reconstruction interval respectively and the images were transferred to a personal computer. Using a program developed to measure facial soft tissue thickness in 3D image, the facial soft tissue thickness was measured. After the ten-time repeation of the measurement for ten times, repeated measure analysis of variance (ANOVA) was adopted to compare and analyze the measurements using the three scanning protocols. Comparison according to the areas was analyzed by Mann-Whitney test. Results : There were no statistically significant intraobserver differences in the measurements of the facial soft tissue thickness using the three scanning protocols (p>0.05). There were no statistically significant differences between measurements in the 3 mm slice thickness and those in the 5 mm, 7 mm slice thickness (p>0.05). There were statistical differences in the 14 of the total 30 measured points in the 5 mm slice thickness and 22 in the 7mm slice thickness. Conclusion : The facial soft tissue thickness measurement using 3D images of 7 mm slice thickness is acceptable clinically, but those of 5 mm slice thickness is recommended for the more accurate measurement.

머리염색이 인체에 미치는 영향

윤형식,황성호,이현륭,김수호,박연석,권낙현,정호진,김동훈,노현주,홍성호,박병찬,이관,정해관 東國大學校醫學硏究所 2002 東國醫學 Vol.9 No.1

일상생활에서 모발염색은 흔히 접할 수 있는 미용의 한 종류로 특히 젊은층을 중심으로 폭발적으로 유행하고 있다. 염색을 위항 사용하는 약제는 표백제와 발색제 등 각종 화학약품이 사용되고 있으나 이로 인한 건강장해에 대한 연구는 그리 많지 않다. 저자들은 염색이 인체의 모발건강에 미치는 영향을 파악하기 위하여 염색과 관련된 주관적 증상과 모발의 변화에 대한 실험적 연구를 시행하였다. 동국대학교 경주 캠퍼스 재학생 80명을 대상으로 설문조사를 시행하여 염색 유 ·무 및 염색 후에 경험한 증상에 대해 설문 조사하였고, 의과대학 재학생 46명을 대상으로 피부 반응 테스트를 실시하였다. 또한 염색 전후의 모발 탄성도를 측정하였고 모발의 상태를 파악하기 위해 전자 현미경검사를 실시하였다. 설문조사 결과 염색 전에 비하여 염색 후 안구혼탁, 안구건조, 시력저하, 발진 및 접촉성 피부염, 모발손상, 모근손상 등의 증상을 더 많이 경험한다고 호소하였다(p<0.05). 모발손상과 모근손상은 헤어드라이어 사용 빈도에 따라 증가하는 것으로 조사되었다(p<0.05). 피부반응검사에서 가려움증이 가장 많은 증상이었으며 이는 여성보다는 남성에서 높은 것으로 조사되었다. 염색 전후의 모발장력은 염색 전 134.5±10.37g, 염색 128.0±30.69g, 염색 이틀 후 112.5±19.69g으로 나타났다. 염색 전후의 모발의 전자현미경 케라틴 층이 현저히 감소하고 모발이 가늘어지는 차이를 보였다. 염색은 모발손상, 모발 케라틴 손상 및 모근 손상, 발진 및 접촉성 피부반응, 안구혼탁, 안구건조, 시력 저하를 유발한다. 따라서 염색약으로 인한 손상에 대한 주의와 예방이 필요하다고 생각한다. 예방대책으로 염색 전 피부테스트를 통한 적합성 여부를 판단하는 것이 필요하며 가급적 염색을 피하는 것이 좋을 것이다. 염색약에 발암물질이 포함되어있다는 보고도 있어 염색 제조사의 철저한 실험과 염색 물질의 선별이 염색으로 인한 부작용을 최소화하는데 중요한 역할을 할 것이다. Hair coloring has became one of the most popular cosmetic activities to younger generations during last decade. However, there are few studies on the health effect of widespread use of chemical dyes. This study was conducted to study the effects of hair coloring dye on hair and other systems. We conducted a questionnaire survey of 80 persons in Kyongju campus, Dongguk University. We have done open patch skin test on 46 medical students. We also conducted scanning electron microscopy to examine the hair strength and structure before and after hair coloring process. Injury of hair and hair bulb, contact dermatitis, turbid eyes, xerophthalmia, and poor visual acuity were the main symptoms complained after hair coloring (p<0.05). Injury of hair and hair bulb were increased by frequency of hair-dryer use(p<0.05). In open patch test, pruritus was complanined by more than half of the subjects. Mean strength of hairs before and after hair coloring was as follows; 134.5 (SD 10.37)g before hair coloring, 128.0 (SD 30.69)g immediately after hair coloring, and 112.5 (SD 19.69)g after two days. The scanning electron microscopic findings of hair surface before and after hair coloring showed decreased keratin layer and thinning of the hair. Hair coloring induces injury to hair, its keratin layer, and hair bulb as well as contact dermatitis, turbid eyes, xerophthalmia, and poor visual acuity. Therefore, we think that precaution is needed in use of hair coloring dye. To prevent complications induced by hair coloring dye, it is necessary, especially to those with allergy or skin disorders, to perform skin test before action and avoid hair coloring whenever possible. Longterm health effects of hairdye should be studied and manufacturing companies should try to minimize complications induced by hair coloring dye.

요골동맥과 복재정맥을 이용한 관상동맥우회술의 조기성적

김관창,원태희,한재진,최수승,안재호 이화여자대학교 의과학연구소 2008 EMJ (Ewha medical journal) Vol.31 No.2

Background:Increasing interest and use of arterial conduits is based on the better patency of left internal thoracic artery(LITA) than that of saphenous vein(SV) graft. We compared the early result of coronary artery bypass grafting(CABG) using LITA and radial artery(RA group) with CABG using LITA and SV only(SV group). Material and Method:We compared the early operative results of 6 cases in RA group with 18 cases in SV group selected from 24 cases that had CABG between January 2006 and December 2006. We analyzed each group on the preoperative risk factors and operative results. Results:We can’t find significant differences in clinical and hemodynamic characteristics before surgery. There were no statically significant difference between two groups in operative mortality and each morbidities(postoperative intraaortic balloon pump insertion, bleeding, stroke, perioperative myocardial infarction, wound dehiscence), respectively. However, the overall incidence of conventional CABG using cardiopulmonary bypass was higher in RA group compared to SV group(p=0.016). Accordingly, RA group had longer duration of ventilation time(p=0.004) and ICU stay(p=0.003) than SV group with statically significant difference between two groups in hospital stay. The graft patency on postoperative coronary angiography or computerized tomographic angiography at 7-14 days after operation in both group patients were 100%(includeing LITA, RA and SV). Conclusion:We had early good operative results in RA group and SV group. 관상동맥우회술에서 내흉동맥의 장기개통률이 복재정맥보다 우수하다는 것이 알려짐과 더불어 두 개의 내흉동맥을 이용한 군에서의 장기 임상 성적이 하나의 내흉동맥만을 이용한 군에서의 성적보다 우월하다 것이 알려지면서 최근에는 동맥이식편의 사용이 증가하고 있다1)2). 좌내흉동맥이 동맥이식편중 가장 많이 그리고 오래 전부터 사용되어왔고 그 장기 개통률이 매우 우수한 것으로 증명되면서, 이식편으로 사용 가능한 다른 동맥이식편에 대한 사용이 늘어나고 있는 추세이다. 좌내흉동맥 이외에 사용될 수 있는 동맥이식편으로는 요골동맥, 우내흉동맥, 우위망막동맥 등이 있다. 이 중 우내흉동맥은 좌내흉동맥과 같이 사용한 경우 장기 생존율이 높다는 보고도 있지만 가용길이가 짧아 이용에 한계가 있고 수술시간이 길어지며 상처 합병증과 기술적인 문제 등이 있다2). 요골동맥은 Carpentier 등3)에 의해 1970년대 초 처음 이식편으로 소개되었으나 추적 관상동맥조영술상 높은 이식편 부전으로 인해 사용이 중단되었다가 1989년 다시 소개되어 주목을 받게 되었고4), 요골동맥박리술의 기술적인 변형과 항연축제의 사용으로 요골동맥의 연축을 최소화하여 사용하면서 많은 저자들에 의해 좋은 임상 성적과 높은 개통률을 보이고 있다5-7). 본 이화여자대학교 목동병원 흉부외과에서도 요골동맥을 좌내흉동맥에 이은 두 번째 동맥이식편으로 사용하고 있는데 본 연구에서는 본원에서 경험한 요골동맥을 사용하여 시행한 관상동맥우회술의 임상 성적과 수술 후 관상동맥조영술 혹은 컴퓨터 단층 혈관조영술 결과를 분석해 보고 아울러 이를 요골동맥을 사용하지 않고 내흉동맥과 복재정맥만을 이용한 군의 성적과 비교 분석해 보았다.

지베렐린과 에세폰의 葉面撒布가 '美白' 복숭아의 熟期와 品質에 미치는 影響

김영호,윤철구,임상철,김학현,이철희,최관순,김선규 충북대학교 농업과학기술연구소 1999 農業科學硏究 Vol.16 No.-

In order to obtain the basic data for artificial maturity control of 'Mibaek' peach, GA and ethephon were foliar sprayed 4 weeks prior to harvest, and their effects on fruit maturity and quality were examined. GA and ethephon tended to decrease the fruit weight except 100mg ㆍ L-1 GA+50 to 100mg · L-1 ethephon treatment. GA increased the fruit firmness, and ethephon at higher concentration increased the fruit drop. Harvest date was advanced for 7 to 8 days by ethephon while was delayed for 6 to 8 days by GA treatment, regardless of concentration.

첨단기술의 기술가치 평가기법에 관한 연구

尹寬鎬 培花女子大學 2008 培花論叢 Vol.26-27 No.-

The main objective of this research is to propose a new technology valuation method which is easy to understand and apply. In addition, the method is designed to generate monetary value, rather than score or rank, of technology. To this end, 1 first have reviewed a variety of previous valuation methods and identified advantages and disadvantages of them. Based on the analysis, I have proposed the overall frameworkand detailed procedure of a new valuation method. In doing that, I have emphasized the following factors. First, the new method is applicable to high-tech areas, rather than traditional manufactuhng sectors. Second, the proposed method analyzes the structural relationship between market value and technology value and integrate them into valuation process. Third, the new method takes idiosyncratic charaeteristics of various industrial sectors into account. Fourth, the method is designed to generate monetary value, instead of score or rank. Fifth, the whole process of valuation is module-based where respective modules focus on specific functions but, as a whole, constitute a systematic framework. Sixth, the set of input data comprises two parts, a sub-set provided by individuals or organization to be evaluated.

최대근력부하와 폭발적 근력부하에 의한 신경-근피로와 그 회복과정 비교 분석

유관호,이무연,이승훈,김민섭,육조영,임정일,임완기,김대경 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The result which was gained from this study is as follows. From the conclusion of this study it was confirmed that resistant motion at high level strength brings about rise in density of lactate in blood at the same time decline of muscular power and generates acute fatigue of nerve-muscle accompanied by decline in electrical activity of muscle. On the other hand explosive loading produced fatigue at body center and decline in nervine-muscular activity particularly for men, In case of women explosive load did not produce fatigue in the same level as men and they were also quicker in recovery after exercise. Based on 2 types of loading method used in this study there was clearly difference in the process of restoration from resistant motion. For greater decline in muscular power and electromyogram activity more longer period of recovery was require.

터빈 속도검출신호의 자동 백업 장치 개발

김관행,김호찬 濟州大學校 産業技術硏究所 1998 산업기술연구소논문집 Vol.9 No.2

A speed detector of governor. which control the output and speed of a generator. is important because a detector failure can have caused the shutdown of a power plant. Thus, it is necessary to introduce the switching method with two complementary detectors. This paper presents a comparative study of speed signal detector switching methods. One method has been tested at a power plant in Buk-cheju and the approach described here is expected to be of wide applicability.

벤처기업의 가치평가

尹寬鎬 배화여자대학 2004 培花論叢 Vol.23 No.-

As the ultimate goal of the firm changes from profit maximization to the value maximization, managers come to have an interest in the share holder's value. The purpose of this study is to find out the evaluating way of true value on venture companies. Nowadays it is different between the market value and the intrinsic(quantitative) value of venture companies, to develop a model that can explain the difference, and to propose a new method of evaluating venture companies. The intrinsic value is calculated based on 'the standard for deciding the underwriting price of publicly offered stocks,' which is based on discounted cash-flow(DCF) analysis. The market value of venture companies was usually higher than intrinsic values, and argument was raised over the inclusion of bubble in their stock price. This study tried to arrange the valuation theory of venture companies, for example, discounted cash-flow(DCF) model, free cash flow(FCF) model, accounting model and multiples model. In summary, this paper suggest that as the society is becoming more complicated and the amount of information is increasing, the valuation of venture companies using new method should be implemented.

신경외과 영역의 감염에 대한 Cefnam^(�)(Cefuzonam Sodium, L-105)의 임상 효과

김관태,장헌상,김성호,김윤 최신의학사 1991 最新醫學 Vol.34 No.10

구다니도자기(九谷燒) 연구

우관호,김문정 홍익대학교 산업디자인 연구소 2003 미술디자인 논문집 Vol.- No.8