The Effect of Surface Engineering on Nanoscale Adhesion and Friction of Nano and Energy Materials

박정영 한국표면공학회 2013 한국표면공학회 학술발표회 초록집 Vol.2013 No.5

한국산 마늘에 의한 Aspergillus parasiticus의 성장 억제 효과

박정영,김종규,Park, Jeong-Yeong,Kim, Jong-Gyu 한국환경보건학회 2009 한국환경보건학회지 Vol.35 No.2

This study was performed to investigate the possible effect of garlic produced in Korea on the inhibition/reduction of growth of A. parasiticus, a toxigenic strain. The effect was studied using different concentrations of freeze-dried garlic in potato-dextrose agar (PDA) and/or in yeast-extract sucrose (YES) broth at $25^{\circ}C$ for 15 days. While inhibition of the fungal growth due to increasing the concentration of garlic was observed, the more remarkable effect was observed on the ninth day. Reduction of fungal diameter as a result of addition of garlic on PDA was observed to range between 3.4% to 20.1 % while reduction of mycelial weight in YES broth ranged from 9.9% to 30.5%. The 0.5% and 1.0% concentrations of garlic significantly reduced fungal diameter in PDA on the 9th day, while 0.1 %, 0.5%, and 1.0% concentrations of garlic significantly reduced the mycelial weight in YES broth (p<0.05). Dose-response relationships were observed between the concentration of garlic and inhibition of growth both in solid culture and in liquid culture. This study indicates that garlic could be an effective inhibitor at a human consumption level of the growth of A. parasiticus. More research is needed to study the inhibitory effects of the main active component of garlic.

RhPt 이종금속 나노입자의 크기 및 조성 제어를 통한 촉매 활성도에 관한 연구

박정영,김선미,Park, Jeong-Young,Kim, Sun-Mi 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.6

This study shows that catalytic activity of bimetallic RhPt nanoparticle arrays under CO oxidation can be tuned by varying the size and composition of nanoparticles. The tuning of size of RhPt nanoparticles was achieved by changing concentration of rhodium and platinum precursors in one-step polyol synthesis. Two-dimensional RhPt bimetallic nanoparticle arrays in different size and composition were prepared through Langmuir-Blodgett thin film technique. CO oxidation was carried out on these two-dimensional nanoparticle arrays, revealing higher activity on the smaller nanoparticles compared to the bigger nanoparticles. X-ray photoelectron spectroscopy (XPS) results indicate the preferential surface segregation of Rh compared to Pt on the smaller nanoparticles, which is consistent with the thermodynamic analysis. Because the catalytic activity is associated with differences in the rates of $O_2$ dissociative adsorption between Pt and Rh, this paper suppose that the surface segregation of Rh on the smaller bimetallic nanoparticles is responsible for the higher catalytic activity in CO oxidation. This result suggests a control mechanism of catalytic activity via synthetic approaches of colloid nanoparticles, with possible application in rational design of nanocatalysts.

전문대학 관광영어통역과 교과과정에 관한 연구

박정영 관광경영학회 1999 관광경영연구 Vol.4 No.-

Even though tourism English has been realized as the most important factor in the tourism industry, effective and systematic education has not been done because the curriculum was not developed based on basic English education theories. It is not a good approaching method that teaching several situational conversations for the tourism places is realized as the primary aim of tourism English education, which doesn't help students in the real dynamic situations. The tourism English education should be based on communication like other English education. This study developed a curriculum model of tourism English interpretation department at 2-year colleges based on both of English education and tourism theories. A curriculum evaluation sheet was also developed in this study to evaluate the present curricula of tourism English interpretation departments at 2-year colleges for better changes and improvements.

21C 국민관광교육에 관한 연구

박정영,김나희 대한관광경영학회 2000 觀光硏究 Vol.15 No.2

The previous research for tourism education has focused on the development of curriculums and effective teaching techniques for the students who major in Tourism and the effective educational systems for professionals. But the tourism education for the people should be researched by another approach because tourism is regarded as a right. The purpose of this study is to define 'tourism education', to prove the necessity of the tourism education for the people, and to suggest a new tourism educational system. A lifelong(continuing) education is mentioned for this purpose, which includes tourism education in the elementary, secondary, higher, and adult education. At the elementary and secondary levels, an independent subject would be more effective dealing with when, where, how to enjoy tourism while some contents are now inserted in other subjects dealing with the hosts' mandatory such as how to greet foreign tourists. At the higher level, various cultural subjects of tourism would be open for all students and tourism education courses would be made for the teachers who could give tourism lectures in the elementary and secondary levels. In the adult education, more attention needs for the hosts of tourism destinations and the adults and elderly people.

경동맥 협착증에 대한 외번 내막절제술의 결과

박정영,권우형,서보양 대한혈관외과학회 2012 Vascular Specialist International Vol.28 No.1

Purpose: Potential benefits of eversion carotid endarterectomy (eCEA) compared with conventional carotid enderterectomy (cCEA) are more simple and faster reanastomosis with a low risk of restenosis. However, in Korea, eCEA is not popular having only one report of eCEA. This study aimed to investigate the results of eCEA. Methods: From July 2008 to September 2010, authors performed 36 eCEAs for patients with carotid artery stenosis in our hospital. Patients' demographics and clinical data were retrospectively reviewed. Regarding early (<30 days) results including the frequency of postoperative stroke, myocardial infarction, cerebral hyperperfusion syndrome, bleeding, cranial nerve palsy, new brain lesions (NBLs) on diffuse-weighted MRI (DW-MRI) and mortality were examined. Mid-term results such as stroke, death and restenosis after over thirty days were also examined. Results: Mean age was 66.6 years old and 88.9% of the patients were male. Twenty-four patients (66.7%) had a previous neurological event in the preceding 6 months. A carotid shunt was used in 3 cases (8.3%) and mean carotid clamping time was 25.4 minutes. One case (2.8%) of non-disabling ipsilateral stroke, 1 case (2.8%) of wound hematoma and 1 case (2.8%) of cranial nerve palsy developed after operation. DW-MRI was conducted in 27 patients (75.0%) and NBLs were detected in 4 patients (11.1%). One case (2.8%) of restenosis was discovered during the follow-up period (mean, 9.0 months), and there were no strokes or death. Conclusion: Early and mid-term postoperative stroke and complication rates of eCEA were acceptable in our series. However, to assess efficacy of eCEA, further large-volumed and long-term follow-up studies are needed.

난연제의 최근 개발 동향

박정영 한국염색가공학회 2006 염색가공 Vol.1 No.-

Metallic Discoloration on the Right Shin Caused by Titanium Alloy Prostheses in a Patient with Right Total Knee Replacement

박정영,신동훈,최종수,김기홍 대한피부과학회 2013 Annals of Dermatology Vol.25 No.3

The differential diagnosis of bluish-gray pigmentation of the skin includes dermal melanocytosis, malignant melanoma and metallic discoloration. Of these disorders, metallic discoloration, which develops from deposits of fine metallic particles on the skin, is an uncommon dermatologic disease. We report a case of metallic discoloration of the right shin caused by titanium alloy prostheses in a patient with right total knee replacement. The patient had bluish-gray pigmentation on her right shin as well as pain while walking. Histopathologic findings of the skin lesion showed abundant black particles in the perivascular area of the lower dermis. Polarizing microscopy revealed refractile foreign materials in the dermis. An energy dispersive X-ray spectrophotometer unit attached to a transmission electron microscope detected titanium and aluminium peaks in the specimen.

조리종사자의 손 씻기 의식과 실천 및 손의 지표미생물 오염도에 관한 연구

박정영,김중순,김종규,Park, Jeong-Yeong,Kim, Joong-Soon,Kim, Jong-Gyu 한국환경보건학회 2010 한국환경보건학회지 Vol.36 No.2

Hand-washing is one of the major factors in personal hygiene and public health. This study was undertaken to investigate the hygienic behavior of food-service employees, focusing on awareness of hand washing, hand washing practices, and the load of index microorganisms (aerobic plate count, total and fecal coliforms, Escherichia coli, and Staphylococcus aureus) on the hands of food-service employees. A questionnaire survey completed by direct interview, direct observation of restrooms by the researcher and trained observers, and microbiological examination according to the Food Code of Korea were carried out. In the survey, a positive attitude toward hand washing compliance was reported; however, improper hand washing and poor hand hygiene of the food-service employees were seen under direct observation. Significant differences (p<0.05) were found between the questionnaire survey and the direct observations in hand washing compliance after using the toilet, duration of hand washing, use of hand washing agents, use of hand washing tools, washing of different parts of the hands, hand-drying method, temperature of water, and method of turning off the water. Samples taken from employees' hands before washing showed higher levels of bacteria than those taken during work and/or after washing (p<0.05). Poor hand washing practices were indicated by the positive results for total and fecal coliforms, E. coli, and S. aureus on the hands of some food-service employees. This study showed that there is a marked difference between the food-service employees' awareness of hand-washing and their actual hand-washing practices. The poor hand hygiene of and improper hand washing by the food-service employees should be addressed for improved food safety.

Fabrication and Characterization of Microcolumn Array Aligned by Field Emission Array ( FEA )

박정영,Jared D. Lera,이용재,전국진,이종덕,M. Yakshin,최성수,국양 대한전자공학회 1998 대한전자공학회 학술대회 Vol.1998 No.1