• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제32권2호
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• pp.117-128
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• 2006

Free flap transplantation with microvascular anastomosis has been successfully performed by development of surgical technique, materials and postoperative monitoring equipments of flap. But success rate of microvascular anastomosis is influenced by various factors, and failure rate is about 5-10%. The most influential factor for success rate is surgical technique and other factors that influence failure of microvascular anastomosis are ischemic time of free flap, thrombus formation of anastomosis region and vascular spasm. Many studies has been published in microvascular anastomosis with histologic effect for irrigating solution. But local irrigation solution has been used clinically in microvascular anastomosis, the comparison with each solution, microhistological study for endothelial cell repair and vascular patency has not been reported. The heparin which is anti-thrombotic agent, and urokinase which is fibrinolytic agent are used for this study. Vascular patency and thrombus formation in experimental micro-arterial anastomosis, and endothelial repair were observed with histologic analysis, scanning electron microscopy, transmission electron microscopic examination. The results were obtained as follows: 1. In vascular patency test in 30 minute and 7 days after micro-arterial anastomosis, equal effects of good vascular patency were obtained in group of local irrigation with heparin and urokinase. 2. In thrombus formation in 7 days after micro-arterial anastomosis, equal effects of minimal thrombus formation were obtained in group of local irrigation with heparin and urokinase. 3. In toluidin blue staining in 7 days after micro-arterial anastomosis, local destruction of endothelial cell and inner elastic lamina were seen and endothelial repair was not seen. 4. In scanning electron microscope examination in 7 days after micro-arterial anastomosis, endothelial cell was not seen in peripheral to suture materials, thrombus associated fibrin network was observed. 5. In transmission electron microscope examination in 7 days after micro-arterial anastomosis, inflammatory cell was seen within smooth muscle cells in site of endothelial cell destruction, smooth muscle cell around suture material were arranged irregularly, some collagenous change were seen. From the results obtained in this study, same results of good vascular patency and anti-thrombotic effect of heparin and urokinase were obtained as a local irrigation solution, and repair of endothelial cell was not seen in 7 days after micro-arterial anastomosis.

• Journal of Preventive Medicine and Public Health
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• 제38권2호
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• pp.208-214
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• 2005

Objectives: This study was performed to examine the factors affecting re-smoking in male workers. Methods: A self-administrated questionnaire survey was conducted during April 2003 to examine the smoking state of 1,154 employees of a company that launched a smoking cessation campaign in1998. Five hundred and eighty seven persons, who had stopped smoking for at least one week, were selected as the final study subjects. This study collected data on smoking cessation success or failure for 6 months, and looked at the factors having an effect on re-smoking within this period. This study employed the Health Belief Model as its theoretical basis. Results: The re-smoking rate of the 587 study subjects who had stopped smoking for at least one week was 44.8% within the 6 month period. In a simple analysis, the re-smoking rates were higher in workers with a low age, on day and night shifts, blue collar, of a low rank, where this was their second attempt at smoking cessation and for those with a shorter job duration (p<0.05). Of the cues to action variables in the Heath Belief Model, re-smoking was significantly related with the perceived susceptibility factor, economic advantages of smoking cessation among the perceived benefits factor, the degree of cessation trial's barrier of the perceived barriers factor, smoking symptom experience, recognition of the degree of harmfulness of environmental tobacco smoke and the existence of chronic disease due to smoking (p<0.05). In the multiple logistic regression analysis for re-smoking, the significant variables were age, perceived susceptibility for disease, economic advantages due to smoking cessation, the perceived barrier for smoking cessation, recognition on the degree of harmfulness of environmental tobacco smoke, the existence of chronic disease due to smoking and the number of attempts at smoking cessation (p<0.05). Conclusion: From the result of this study, for an effective smoking ban policy within the work place, health education that improves the knowledge of the adverse health effects of smoking and the harmfulness of environmental tobacco smoke will be required, as well as counter plans to reduce the barriers for smoking cessation.

• 대한치과보철학회지
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• 제39권2호
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• pp.157-170
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• 2001

The bond strength is the most important factor in establishing long-term success of resin-retained fixed prostheses. So, various surface treatment methods have been introduced to improve the bond strength of metal surface and bonding resin till now This study was performed to compare the effect of silicoating with that of metal primer and analyze the correlation between treatment time of sandblasting and the bond strength, so that meant to find more effective surface treatment method that could enhance the bond strength of resin-retained fixed prostheses. The surfaces of all specimens made of $Verabond^{(R)}$ alloys were air abraded with $250{\mu}m\;Al_2O_3$ according to treatment time of sandblasting and they were subdivided to be treated with only sandblasting(S group), silicoating following sandblasting(SS group) and metal primer application after sandblasting(SM group). Then pairs of metal specimens (${\phi}10mm{\times}h\;2mm,\;{\phi}6{\times}h\;2mm$) were bonded with Super bond $C&B^{(R)}$. The specimens were stored in $38^{\circ}C$ water for 48 hours and shear bond strength was measured using the universal testing machine. The results were as follows, 1. In the comparison of shear bond strength according to treatment time of sandblasting, bond strength was increased in the order of 0', 15', 30', 45', 60' group. 0' group had significantly lower value than any other, while 0', 15' group were significantly different with 30', 45', 60' group(p<0.05). 2. In the comparison of shear bond strength according surface treatment methods, bond strength was increased in the order of S group. SS group and SM group. S group was significantly different with SS group and SM group(p<0.05). 3. Observing the mode of bond failure. 0', 15' group showed only adhesive failure, and 30', 45', 60' group did mostly adhesive & cohesive failure in S group. In SS group and SM group, all other groups except 0', 15' group showed mostly cohesive failure. From the above results, it is considered that sandblasting should be treated for more than 30 seconds, and metal primer be more effective and available clinically than silicoater system which is complicate, technique-sensitive and time-consuming method, when nonprecious metal surface is planning be treated with in order enhance the bond strength of resin-retained fixed prostheses.

• 대한치과보철학회지
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• 제56권3호
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• pp.235-242
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• 2018

임플란트 피개의치에서 치주적, 보철적 유지관리는 보철물과 임플란트의 장기적 성공에 매우 중요한 요인이다. 유지관리의 실패는 임플란트 주위 골소실 및 보철물이나 구성품의 파절 및 마모로 인해 보철적 실패를 유발할 수 있다. 이 증례에서는 유지관리 실패로 파절된 임플란트 피개의치의 재치료를 위해 기존의 골드 milled bar를 코발트 크롬 milled bar로 외형에 방해되지 않는 형태로 재제작하였고, 하악의 기존 고정성보철은 임플란트 주변 골흡수와 환자의 전신적 문제로 인해 전략적으로 임플란트를 선택하여 두 개의 임플란트에 CM LOC을 연결하여 임플란트 피개의치를 제작하여 재수복하였다. 결과적으로 환자의 위생관리를 수월하게 하는 디자인의, 기능적 심미적으로 장기간 유지관리에 유리한 보철물로 수복하였고 정기적인 유지관리를 시행하였다.

• 한국건설관리학회:학술대회논문집
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• 한국건설관리학회 2002년도 학술대회지
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• pp.235-238
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• 2002

현대 산업사회의 과학기술 발달과 인구집중으로 인하여 기업의 경영조직 업무내용의 확대와 질적 변화에 의해 사무소 건축이 대형화, 고층화되어지고 있다. 특히 수많은 주체들과 분야들로 이루어진 고층사무소 사업을 수행하기 위해서는 사업 각 단계별 주요 정보에 대한 확실한 이해와 경험을 바탕으로 프로젝트 전 과정의 통합관리가 필요하다. 또한 건축계획 구조, 재료 및 시공성(Constructability)의 각 분야별 요소기술들이 효율적이고도 유기적으로 연결${\cdot}$접목되어야 한다. 그러나 설계와 시공간의 상호 인터페이스의 미비로 인한 설계와 시공업체 간의 노하우가 유기적이고 체계적으로 공유되고 있지 못하고 있으며 고층사무소 사업의 시공단계에 있어서 반복적인 문제점이 되풀이되고 있는 실정이다. 이에 본 연구에서는 고층사무소 사업의 시공성을 고려하지 않은 설계로 인해 골조공사의 시공단계에서 유사하게 반복적으로 되풀이되어 발생하고 있는 주요항목들을 파악하고 분석하여 해당 순위를 제시하고자한다.

• Architectural research
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• 제16권2호
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• pp.37-44
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• 2014

Utilizing spaces for awareness could be superficially noble. However, the typology of spaces played an important role in addressing the awareness of translating the messages through tangible forms, which in this context are sculptures. Assuring the efficacy of the typology of the spaces that is compatible with the content is important to ensure its timelessness to the dynamic demographical change of viewers. Therefore, the study proposes an investigation of the efficacy of typology of public urban space; garden that accommodates memorial sculptures. The study intends to analyze the features and flaws of ASEAN Sculpture Garden, as a mediatory role of ASEAN in instilling awareness of unity between ASEAN members to the public. The objective of the study is to analyze the efficacy of the garden to accommodate the rich memorial sculptures. The body of the research is formed by theoretical and case study research. It is projected by three methods; archival research, semi structured interviews and site documentation; direct observations and site visit. The qualitative data then will be analysed using Actor Network theory, keyword coding and site findings. Findings showed that as the main objective of the garden is to exhibit the sculptures, it could be summed up that it has failed to meet the apparent intention based on the site analysis conducted by the researcher. The typology of the space should be able to communicate the project's aims continuously rather than serving the function temporarily. The variables, which are space and time factors are debatable, as the neighboring tourist spot, National Monument residing the wide square managed to attract public attention due to its great efficacy of typological space regardless the time factor. As a conclusion, the typology of space is a huge factor to ensure the park's success.

• 한국산학기술학회논문지
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• 제14권4호
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• pp.1699-1708
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• 2013

한국의 대형 유통회사인 홈플러스는 단기간에 대규모 성장을 하였다. 이 회사를 성공적으로 성장하게 한 가장 중요한 요소 인 핵사곤 리더십은 경영자의 삶의 경험, 경영 철학을 기반으로 리더의 기본적인 자질을 키우는 역량을 강조한 특징을 갖고 있다. 핵사곤의 주요 포인트는 사람, 일, 성과, 관리, 운영, 교육과 성장 등의 조직운영의 기본요소와 성공과 실패, 경영의 효율과 효과 등의 상세한 분석을 통해 현업의 경험을 바탕을 기반으로 매우 실천적인 이론을 구축하였다. 핵사곤 리더십은 스킬이 아닌 리더의 자질을 강조하는 것이 특징이다. 6가지의 리더가 갖추어야하는 리더십 자질이 개별적으로 발현되는 것 보다는 동시에 발현될 경우 더 큰 시너지효과를 발휘하며 이를 위해 교육을 통해 지속적으로 구성원들에게 내재화를 시키고 있다. 이러한 분야의 연구를 위해 한국의 'H'그룹의 종업원들의 몰입의 결과를 'Viewpoint'라는 매년 실시되는 평가 방식을 통해 성과가 나타남을 알 수 있었다. 이러한 비재무적인 성과들이 재무적 성과로 이어지는 결과를 볼 수 있다.

• 대한지리학회지
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• 제44권4호
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• pp.532-543
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• 2009

외식산업 프랜차이즈는 외상 매출액의 비중이 작고 자금회전이 원활하여 국내에서 창업 선호도가 매우 높다. 이에 본 연구에서는 서울시지역 외식산업 프랜차이즈 1호점들의 입지분석을 통해 향후의 입지경향을 예측하는 데 목적을 두었다. 본 연구결과는 다음 세 가지로 요약된다. 첫째, 외식산업 프랜차이즈 1호점의 공간분포형태는 최근린지수(R) 0.16으로 집중된 분포패턴을 보인다. 둘째, 외식산업 프랜차이즈 1호점은 상관분석 결과 특히 금융기관수, 사업서비스업체수, 숙박 음식점업체수 등의 15개 변수와 상관성이 있다. 셋째, 다중회귀분석에 의해 최종적으로 선정된 입지요인은 설명력 64% 정도의 금융기관수이다. 이러한 본 연구결과에 의거하였을 때 금융기관수가 많은 서울시 강남구와 중구 지역은 향후에도 외식산업 프랜차이즈 1호점의 선점 장소가 될 것으로 예측된다.

• 무역학회지
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• 제47권5호
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• pp.253-272
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• 2022

As the digital era accelerates, traditional perspectives have limitations in explaining the success or failure of export performance. The purpose of this study is to analyze new factors affecting export performance from the perspective of customer experience, which has emerged as an important factor in securing a competitive advantage and generating organizational performance. After deriving hypotheses based on literature review and discussion, a research model is designed in which three factors of customer experience such as understanding customer's objectives, customer value creation capability, and customer journey management are the antecedents, and export performance is the dependent variable. This model also includes organizational agility and personal contact as the moderating variables. To verify the hypotheses, multiple regression analysis was conducted on the collected data drawn from 198 SME exporters. According to the analysis results, it was found that all three antecedents positively affected export performance. In particular, the organizational agility and personal contact were confirmed to have a moderating effect that creates better export performance by interacting with customer value creation capability. The theoretical significance of this study is to find that effective customer experience management can be a key factor in creating export performance. The results suggest that checking the overall customer journey, exporters should select and intervene to intensively manage key touch points that can have a decisive impact on the quality of customer experience. At the end of the paper, practical implications to be considered in creating export performance through effective customer experience management are presented.

• Journal of Korean Neurosurgical Society
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• 제29권10호
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• pp.1316-1321
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• 2000

Objectives : The authors analyzed the surgical series of Cushing's disease to evaluate the proper treatment policy and to verify the possible prognostic factors. Material and Methods : Of 50 patients diagnosed as Cushing's disease and operated at Department of Neurosurgery of our institute between 1988 and 1999, 48 patients with available medical records were analyzed retrospectively. Mean follow-up period was 48 months(3 to 109 months). Preoperative diagnosis was made after evaluating the patients with multiple-stage endocrinological studies and 31 selective patients were evaluated with inferior petrosal sinus sampling(IPSS). Magnetic resonance imaging(MRI) and/or high resolution computerized tomography(CT) was done in all patients. A total of 51 transsphenoidal adenomectomy(TSA) were performed including 3 revision for initial surgical failure cases. Remission was decided on the basis of both endocrinological criteria and clinical status. Radiation and/or ketoconazole therapy were applied to failed cases. For the verification of prognostic factors, the authors evaluated the statistical significance of multiple variables over remission rate by chi-square test. Result : Sensitivity of IPSS for central localization was 93.5% which was better than that of MRI(87.5%). But for lateralization, it was 72.4% for IPSS versus MRI 90.5%. Success rate of TSA was 82%(42/51) and recurrence rate was 9%(4/48). When including adjuvant treatments for surgically failed cases, overall success rate was 89.6% and all of 3 reoperated cases(TSA) due to recurrence were successful. Significant complication occurred in 7.8%(4/51) after TSA including hypopituitarism, diabetes insipidus, and visual loss. Non-existence of tumor in MRI and prolonged symptom duration(>3 years) were significant prognostic factors. Conclusion : TSA can be considered as initial treatment for Cushing's disease. In surgically failed cases, multiple treatment modality may improve the overall outcome and repeated TSA for recurrent cases seem to provide similar success.