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a-TN-LCD의 전기광학특성에 표면액정배향이 미치는 영향
황율연,이창훈,서대식,이보호 崇實大學校 生産技術硏究所 1996 論文集 Vol.26 No.2
The characteristics of the response time and the viewing angle on twisted nematic(TN)-liquid crystal display(LCD) and amorphous (a)-TN-LCD without rubbing were investigated. To measure the Tansmission-Voltage, response time, and viewing angle characteristics, we prepared three kinds of LC cells and then studied the surface liquid crystal alignment effect. It was found that the response time on a-TN-LCD was fast compared to the TN-LCD, and the weak anchoring strength was attributed to the fast response time on a-TN-LCD. Also, we obtained the wide viewing angle characteristics on-a-LCD. We suggest that the liquid crystal alignment effect on LCD device is very important for electro-optical characteristics.
Ethyoene Oxide 폭로 근로자의 말초 임파구 자매염색분체 교환에 관한 연구
황천현,박종태,장성훈,김대성,이원진,김청식,김영환 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.4
Operators of hospital sterilizers who use ethylene oxide(EtO) were studied to determine the exposure of EtO level and the frequency of sister chromatid exchanges(SCEs) from June 12 to July 20, 1997. To evaluate SCEs in the peripheral blood cells, we selected 22 workers at the central supply room of 4 university hospitals and 22 unexposed workers at the same hospitals according to match sex, age, and smoking habit and also did questionnaires. The mean air concentrations(8-hr TWA) of EtO at 4 university hospitals were less than 1 ppm. The SCE frequencies in exposed workers to EtO and controls were normally distributed. The SCE frequencies in exposed workers to EtO and controls were 6.42±0.63, 5.86±0.69, respectively and their differences were statistically significant(p=0.0093). But there were no statistically significant differences in smoking, alcohol intake, coffee drinking. Especially smokers who exposed to EtO were increased SCE statistically significant than the exposed group who did not smoke.
복직근 및 박근 근피판술을 이용한 골반 및 서혜부 연부조직 결손의 재건
이재화,정윤규,김주봉,유대현,황성관,이훈범,김석원 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.6
Many operations for the reconstruction of the pelvic area have been studied until now. The local muscle flap is often used for the closure of these complex wound. But, these local muscle flaps may not be available for reconstruction due to the factors of infection, radiation, and surgical trauma. Since rectus abdominis muscle and gracilis muscle were introduced, their use has been steadily increased for the reconstruction of soft tissue defect of the pelvic area. Inferiorly based rectus abdominis muscle flap and the gracilis muscle flap have been adopted for well-vascularized soft tissue coverage of the defect of pelvis and groin area. These techniques were utilized in seven patients. Of these patients, rectus abdominis muscle flap was used on four patients and three patients were treated with gracilis muscle flap. Among these, chronic osteomyelitis of pelvic bone has been managed with inferiorly based rectus abdominis muscle flap in three patients. No complication has been found. The mean postoperative follow-up period was 26 months, with a range of 12 to 39 months. In conclusion, these muscles are functionally expandable , and provide adequate tissue volume with sufficient blood supply away from the zone of injury, and readily transposed into the pelvis and groin area through subcutaneous tunnel, and serve as an antibiotic delivery system that aids in the eradication of infection. These findings suggest a reconstructive option for the defect of pelvis and groin, and/or bone infection in this area.
응급실을 내원한 구강악안면외과 안면골 골절 환자의 변화에 대한 비교 연구
신상훈,성화식,강영훈,황대석,김용덕,김욱규,김종렬,정인교 부산대학교 병원 암연구소 2008 부산대병원학술지 Vol.- No.24
Although there have been many clinical studies about the facial trauma in the recent as well as in the past, severity and frequency of facial trauma are reported multifarious. It seemed to be because of variety of social, cultural, and environmental factors, and the view point of investigators. In this study, we investigated about the patients visiting emergency room during recent 4 years(2004-2007), and compared with retrospective study during former 10 years(1992-1996, 1999-2003) in Dept. OMS Pusan National University Hospital. We assessed the cause, type, demographic, etc, and analyzed alterations of facial bone fractures during past 3 periods. The results were as follows. The total number of patients was increased. 429 patients treated for maxillofacial fractures between January 1992 and December 1996, 466 patients treated between January 1992 and December 1996 and 764 patients treated between January 2004 and December 2007. The male-to-female ratio were 4.6:1, 3.9:1, and 4.16:1, respectively. Patient in the age groups of 10-19 years and 20-29 years increased in the latter two periods. Assaults and falls are decreased gradually, but slip down s are increased. Traffic accidents are still major cause of facial trauma. The mandibular fractures showed the highest incidence thorought three periods. Symphysis fractures of mandible was increased and condyle fractures of mandible was drecreased in the third period.
Hwang, Sun‐,Chul,Hwang, Dae Seok,Kim, Ho Yong,Kim, Min Ji,Kang, Young‐,Hoon,Byun, Sung‐,Hoon,Rho, Gyu‐,Jin,Lee, Hyeon‐,Jeong,Lee, Hee‐,Chun,Kim, Sang‐,Hyun,Ba Wiley Publishers 2019 JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A Vol.107 No.10
<P><B>ABSTRACT</B></P><P>Hypoxia and limited vascularization inhibit bone growth and recovery after surgical debridement to treat osteomyelitis. Similarly, despite significant efforts to create functional tissue‐engineered organs, clinical success is often hindered by insufficient oxygen diffusion and poor vascularization. To overcome these shortcomings, we previously used the oxygen carrier perfluorooctane (PFO) to develop PFO emulsion‐loaded hollow microparticles (PFO‐HPs). PFO‐HPs act as a local oxygen source that increase cell viability and maintains the osteogenic differentiation potency of human periosteum‐derived cells (<I>h</I>PDCs) under hypoxic conditions. In the present study, we used a miniature pig model of mandibular osteomyelitis to investigate bone regeneration using <I>h</I>PDCs seeded on PFO‐HPs (<I>h</I>PDCs/PFO‐HP) or <I>h</I>PDCs seeded on phosphate‐buffered saline (PBS)‐HPs (<I>h</I>PDCs/PBS‐HP). Osteomyelitis is characterized by a series of microbial invasion, vascular disruption, bony necrosis, and sequestrum formation due to impaired host defense response. Sequential plain radiography, computed tomography (CT), and 3D reconstructed CT images revealed new bone formation was more advanced in defects that had been implanted with the <I>h</I>PDCs/PFO‐HPs than in defects implanted with the <I>h</I>PDCs/PBS‐HP. Thus, PFO‐HPs are a promising tissue engineering approach to repair challenging bone defects and regenerate structurally organized bone tissue with 3D architecture.</P>
Comparison and Analysis of Tag-Ranking Algorithms based on Clustering
Dae-Hoon Hwang 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.11
Most information in Web 2.0 is made by users and classified by tags assigned by users. Tag-related services and research are focused on work such as automatic tagging and tag-cloud composition; however, classifying media resources and information according to tags and providing the results to users is not still up to the mark. In this paper, image resources and their tag information scattered in the web are collected and a tag-pair weight matrix is created, according to the relations and semantic similarities between tags. To overcome the problems of the existing system, a tag-pair weight matrix-based tag clustering (TBTC) algorithm was proposed to find highly related tags. The threshold used for clustering in this algorithm was studied, and an optimal threshold with high cluster cohesion was determined. Finally, as an experiment, 500 images with the keyword 'tomato' were searched from the Flickr website and highly related tags were derived from the proposed algorithm. The results of this research were examined and compared with the results of existing studies. It was found that the proposed research showed more advanced accuracy and precision than earlier methods.