Selective hydrogen oxidation reaction catalysts approach to enhance the durability of PEMFC for FCEV under the condition of SU/SD and fuel starvation

Su Won Yun(윤수원),Ki Woong Park(박기웅),Tae June Kim(김태준),Byung Il Park(박병일),Gwon Goo Yeo(여권구),Hoon Hee Lee(이훈희),Bum Wook Roh(노범욱),Yong Tae Kim(김용태) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.4

기계시각을 이용한 강구 자동 검사장치

김윤수,박수우,임병훈,김태균,최병재,박철영,이문락,도용태 대구대학교 정보통신연구소 2008 情報通信硏究 Vol.5 No.1

Metal balls are commonly used in mechanical elements and systems including bearings. If there is a defect in a metal ball, it can cause a serious machine failure. By this reason every balls produced are required to be inspected, and the inspection is usually done by human eyes. However, the inspection by human eyes is always with the risk of mistakes, and a need to automate the inspection process is arisen. This paper describes a design of an automatic inspection system for detecting defects on ball surface. A machine vision system is used, and design process and techniques are described in detail. 강구는 베어링을 비롯한 기계 요소 및 장치에서 널리 사용되는 부품이다. 만약 강구에 결함이 있을 시, 이를 사용하는 기계에서 치명적인 결함이 초래될 수 있다. 따라서 제조된 강구에 대해서는 전량검사가 요구되고 있고, 검사과정은 사람의 육안에 의한 검사가 주를 이루고 있다. 그런데 사람에 의한 검사에는 항상 실수의 가능성이 있으므로, 이를 자동화하는 것이 필요하다. 본 논문에서는 강구의 표면 결함을 자동적으로 검사할 수 있는 장치를 설계한다. 기계시각 장치가 사용되었고, 설계에 따른 구체적 절차와 기술들이 서술된다.

TiO2 표면 처리된 LiNi0.8Co0.15Al0.05O2의 전기화학적 특성 평가

진수진, 김직수, 박석준, 나병기 충북대학교 건설기술연구소 2013 충북대학교 건설기술연구소 논문집 Vol.32 No.1

본문참고

황련해독탕 및 귀비탕의 발효 전후 혈소판 응집 억제 효과에 대한 비교 연구

송병정,이수진,권광일 충남대학교 약학대학 의약품개발연구소 2012 藥學論文集 Vol.27 No.-

Recently interest of fermented oriental medicines is increasing for the purpose of disease prevention. Hwangryunghaedok-tang (HR) and Guibi-tang (GB) are widely used oriental medicines in Korea. HR and GB are well known for anti-inflammatory and anti-stress effect. Glycosides in herbal medicines are transformed to aglycone via fermentation. The fermented medicines are absorbed more and have less individual variation. In this study, HR and GB were compared before and after fermentation by anti-platelet aggregation effect. HR and GB were fermented by various lactobacillus species. The anti-platelet aggregation effect of HR and GB were measured using aggregometer by optical method. Collagen (4 μg/mL) was used as a inducer of platelet aggregation. After measuring anti-platelet aggregation effect, we analysed the data using WinnonlinⓇ program to fit simple Emax model. Then Emax and EC50 values were estimated. In results, GB had little antiplatelet effects. Emax of 5 GB samples (127, 164, 402, 442, 3163) were estimated near zero and others (129, 144, 166, 693, 744) had high EC50 values (> 1500 μg/mL). In contrast with GB, HR had antiplatelet effects. HR which was fermented by Lactobacillus casei and Lactobacillus plantarum (HR-127,HR-144) were most effective sample. Emax and EC50 of HR-127 and HR-144 was 99.99%, 174.73 μg/mL and 100.00% 160.48 μg/mL, respectively. These results indicated that Guibi-tang was inappropriate as anti-platelet aggregation agent and Hwangryunhaedok-tang would be more effective after fermentation as anti-platelet aggregation agent, warranting further study.

국내외 현황 파악을 통한 국내 소아용 의약품의 안전성.유효성 평가제도 개선 방안

이병요,이수진,권광일 충남대학교 약학대학 의약품개발연구소 2013 藥學論文集 Vol.28 No.-

Recently it has been noticed that pharmacokinetics / Pharmacodynamic (PK/PD) properties of drug in the pediatric population are different from those in adults. Clinical trials that considering age-specific properties and characteristics should be performed and safety and efficacy are established based on the clinical trials. FDA and EMEAs exists in developed countries especially America and Europe due to which there are proper guidelines for pediatric patients. However, in Korea, there doesn’t exist any guidelines and the study is focused regarding it. This study aimed to analyze the current state of safety and efficacy assessment of pediatric drug by foreingn drug regulatory agencies and suggest the regulatory methods for Korea based on FDA and EMEA guidelines and regulatory. MEDLINE and foreign drug regulatory agency database were extensively searched to obtain scientific research articles, guidance, regulations and pediatric drug review reports on foreign pediatric drug evaluation system.

치아전돌자와 치아밀집자의 측모두부방사선학적 비교

이연수,황현식,강병철 전남대학교 치의학연구소 2003 구강과학 Vol.15 No.4

The purpose of this study was to examine the difference of lateral cephalometric charateristics between dental protrusion and crowding individuals and to find out the possible etiologic factors of each malocclusion. Twenty nine dental protrusion and twenty two crowding individuals were selected from the 4,500 patient records. The tooth size was measured from central incisor to first molar using diagonstic study cast and was compared between two groups. After tracing the lateral cephalometric radiographs, measurements for skeletal factor, hyoid bone position, and incisal position were identified. The means and standard deviations of the measurement of each group were calculated and compared between two groups. Through the comparison of the measurement between two groups, following results were obtained 1. As a result of comparing the tooth size of dental protrusion group with that of crowding group, there was no significant difference between two groups. 2. In the comparison of skeletal measurements, S-N, A'-Ptm', SNA, ANB, and facial convexity of protrusion group showed greater value than crowding group. 3. The measurements of hy-PP and hy-MP showing vertical position of hyoid bone were smaller in protrusion group than those in crowding group. 4. The measurement of hy'-Go showing anteroposterior position of hyoid bone was larger in protrusion group than that in crowding group. The results of the present study showed that dental protrusion inidviduals had the tendency of maxillary protrusion and antero-superior position of the hyoid bone compared to crowding individuals, and these features could be explained as possible etiologic factors of dental protrusion or crowding malocclusion.

용접공들의 면역능에 관한 연구

이수일,조봉수,김영욱,고광욱,조원근,김영실,강수용,황인경,조병만,김돈균 大韓産業醫學會 1997 대한직업환경의학회지 Vol.9 No.1

The authors examined human immunity indicators such as CD4, CD8, Natural Killer(NK) cell, IgG, IgA, and IgM, and heavy metals such as Pb, Cr, Cd to evaluate the health hazard of welders. We selected total 126 male subjects, 60 welders who had more than 5 year working history as an exposure group, and 66 office workers and medical college students as a control group. This immunity evaluation approach is the first newly designed study that has never been tried in past studies on welder's heath evaluation. And the results were as follows. 1. Total lymphocyte count of peripheral blood was significantly higher in welder group, 2,615±650 ea/㎕ compared with 2,368±681 ea/㎕ in control group(p>0.05). 2. The proportion of CD4, CD8, NK cell in welder group was 37.5±9.4%, 24.0±8.8%, and 21.0±9.5%, respectively, and 35.5±6.5%, 25.0±6.9%, and 19.6±8.8% in control group. CD4 and NK cell were slightly higher, and CD8 was slightly lower in welder group. but there was no statistical significance between two groups(p≥0.05). 3. IgG, IgA, and IgM in welder group were 15.9㎎/㎗, 2.7㎎/㎗ and 1.5㎎/㎗, respectively, and 15.6㎎/㎗, 2.9㎎/㎗ and 1.7㎎/㎗ in control group. There was no statistical significance between two groups(p≥0.05). 4. Blood lead, cadmium and chromium concentrations were 4.2±1.8㎍/㎗, 0.4±0.38㎍/㎗, 1.2±0.6㎍/㎗ in welder group and 3.2±1.7㎍/㎗, 0.44±0.29㎍/㎗, 1.1±0.6㎍/㎗ in control group, respectively, and these value were within normal ranges.

구강 연조직 병소의 Nd:YAG laser를 이용한 치료 : 임상 증례보고 CLINICAL CASE REPORTS

김수관,조세인,권병곤,이상호 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.4

The neodymium:yttrium-aluminum-garnet (Nd:YAG) laser is most widely used for treatment of lesions affecting the oral mucosa. A pulsed Nd:YAG laser (SDL-300EN, Samsung Electronics, Korea) with a wavelength of 1.32㎛ was used. In all cases, contact mode was used. Four cases of soft tissue oral lesions are presented to document the clinical aspects. Surgery proceeded without complication and healing was uneventful. This study indicate that the Nd:YAG laser can be used successfully for intraoral soft tissue applications are well tolerated and minimal bleeding.

주민요구충족형 정주권 개발방향 : 자원형 산촌정주권을 중심으로 with Relevance to Resource Oriented Development

姜秉洙,吳德成 忠南大學校 地域開發硏究所 1997 地域開發論叢 Vol.9 No.-

In order to develop natural resources of mountain village regardless of renewable or nonrenewable resources, it is one of very important approaches to connect between county center and residents' settlement in mountain village in terms of both equity and efficiency. There are not many studies on development of mountain village. Especially there is no study on the linking mechanism between county center and residents' settlement in mountain village in terms of resource oriented development type of mountain village. So this study focused on both improvement of social infrastructure and development of mountain villages' natural resources for the vitalization of natural resource oriented mountain village development. The study was conducted by 15 interviewers with the subjects of 84 households in Bo-Eun area, 508 households in An-Dong area, and 426 households in Hong-Cheon area. From the cases, the study found natural resource development oriented strategies in mountain villages. Furthermore, the study suggested the connection model between the county center and the residents' settlement in mountain village in terms of the provision of social infrastructure.

톨루엔 디이소시아네이트 폭로 근로자들의 작업방법에 따른 대사물질의 비교 및 면역능에 관한 연구

이수일,조병만,황인경,이철호,박정래 大韓産業醫學會 1998 대한직업환경의학회지 Vol.10 No.3

Following recent advanced industrialization, the amount of polyurethane to use as thermal insulating materials, upholstery, mattresses and packing materials in automotive and furniture industry is increasing world-widely, and the number of polyurethane-producing worker will be increased. Because the numerous organic solvents are used in polyurethane-producing factory, the workers in this work site is exposed to many organic solvents. Of the organic solvents, Toluene Diisocyanate(TDI) has many hazardous effects to human. The effects of TDI on human are the irritation to respiratory mucosa and gastrointestinal symptoms. Conjunctival irritation, dermal inflammation (redness, pain, vesicular formation) and gastrointestinal symptom(nausea, vomiting. abdominal pain) are reported just after short-term exposure of TDI. TDI is known to give rise to bronchial asthma, as the immune disorder. And because of strongly volatile characteristics of TDI, it is suggested as a more injurious material to human health, especially human immune system, than other organic solvents. Bronchial asthma inducing mechanism of TDI is not clearly known, but on the analogy of TDI induced symptoms and recent studies, early-onset asthma is type I hypersensitivity reaction mediated by immunoglobulin E(IgE), and late-onset asthma is maybe type III hypersensitivity reaction by circulating IgG. And we know that the complicated human immune function is likely to move in such that mechanisms, there are not studies on immune indices evaluating the bronchial asthma-related immune function. The evaluation of change patterns of humoral immunity including IgE and IgG and cellular immunity including T-helper cell. T-suppressor cell and T-cytotoxic cell will be helpful to evaluate exposure degrees and prognosis in TDI exposed workers. Because TDA(toluene diamine) as a biological exposure index of TDI becomes the focus of interest, we know that a study on the correlation between urinary TDA and air TDI and immunological indices will make a contribution to biological effect monitoring indicies. We examined human immunity indicators such as WBC, %Lymph (percentile of Lymphocyte in WBC), %T-cell(percentile of T-lymphocyte in total lymphocyte). CD4, CD8, C3, C4, IgA, IgG, IgM, IgE in peripheral blood to evaluate the health hazard of the TDI-exposed workers. And we examined TDA to evaluate correlation between exposure and effect. Total 90 subjects was selected, 45 workers who worked in the polyurethane-producing factories as an exposed group, and 45 cases who were office workers(10 cases), other blue collors(27 cases), and medical college students(8 cases) as a control group. And the results were as follows; 1. The logarithm of IgE-Log10(IgE)±SD-in peripheral blood of a exposed group was significantly higher than a control group, 2.22 ±0.62 in case group compared with 1.98±0.53 in control group. (p<0.05) 2. IgA and IgM in the polyurethane-producing workers were 261.02±83.12㎎/㎗, 151.97 ±59.64 ㎎/㎗, respectively, and 292.77±100.45, 179.17±100.78 in control group. IgA and IgM was slightly lower in polyurethane-producing group than control.(p>0.05) 3. WBC, %Lymph. %T-cell, C3, C4, CD4, CD8, CD4/CD8 ratio and IgG in case group were 6.391.1 ea/㎖, 37.53 %, 59.54 %, 76.68 ㎎/㎗, 0.76×10(9) ea/L, 0.63×10(9) ea/L, 1.39, and 1606.29 ㎎/㎗, respectively, and 6,974.7 ea/㎖, 35.12 %, 59.64 %, 71.95 ㎎/㎗, 33.94 ㎎/㎗, 0.80×10(9) ea/L, 0.61×10(9) ea/L, 1.39, and 1581.51 ㎎/㎗ in control group. There was no statistical significance between two groups.(p>0.05) 4. In the comparison of each other companies, average of individual urinary TDA in polyurethane paint manufacturing companies is higher than that of polyurethane sponge foaming companies. And, the concentration of 2.6-TDA which is a metabolite of well-vaporized 2.6-TDI is higher than that of 2.4-TDA in the polyurethane sponge foaming companies. But, the concentration of 2.4-TDA which is a metabolite of illvaporized but well skin-absorbed 2.4-TDI is higher in polyurethane paint manufactures. 5. There were no statistical significance in the correlations between individual urinary TDA and immunologic indices.