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RISS 인기검색어
- 검색키워드
- 저자 : 정영섭 (검색결과 42 건)
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정영섭 한국산업기술대학교 지식기반기술.에너지대학원 2013 국내박사
Various output heating elements were extruded with carbon black (CB) filled high density polyethylene (HDPE) composites. The heating element was insulated with a polytetrafluoroethylene (PTFE) tape wrap. After thermal aging near melting point of HDPE, the effects of thermal aging on the morphology, electrical resistivity, and thermal properties of the extruded and electron beam (EB) irradiated heating elements were examined using scanning electron microscopy (SEM) megohmmeter and differential scanning calorimetry (DSC), respectively. The SEM image of HDPE is covered with micro-voids that leave a dimple-like structure on the surface. As the percolation threshold is achieved, CB aggregates are usually located in oval cavities larger than the particles themselves. During the resistivity-temperature cycling test, significant change in resistivity was observed for extruded and EB-irradiated heaters. In case of thermal aged samples at 140?C for 120h, both heaters showed good electrical stability without pronounced changes in resistivity after resistivity-temperature cycling test. After thermal aged at 140?C for 120h, the Heater02-EB composite recovered the oval cavity structure whereas for Heater02, the amorphous region becomes narrower and forms more electroconductive pathway.
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外國人 船員 混乘船舶의 文化·組織的 特性이 自己效能感과 組織커미트먼트에 미치는 影響
The primary purpose of this study is to examine empirically the effect of foreign crew’s cultural and organizational characteristics on their self-efficacy and organizational commitment. Currently, the restrictions on the employment of the foreign crews are being eased in the Korean shipping industry and many problems are occurring consequently. However, specific and empirical studies on the relevancy of cultural and organizational characteristics to the crew’s self-efficacy and organizational commitment on board the vessels with combined crews have not yet been carried out. To solve these problems, we need to examine how the cultural characteristics such as acculturation and accommodation of different culture related to the improvement of cultural homogeneity of vessels with combined crews, and the peculiar characteristics of crew organization such as particularity and difficulty of onboard service influence on the self-efficacy, job satisfaction and organizational commitment of the foreign crews. Since one of strategies to change self-efficacy is to inform the attributes and complexity of task, and to provide with information about environment and how to control it, cultural and organizational characteristics should be taken into consideration in the studies on self-efficacy of organization of the vessel with combined crew as environmental factors. According to Early(1994), effect of a social factor on self-efficacy varies depending on cultural environment. In case of collectivism, for instance, self-efficacy can be better explained by social cognitive theory than in individualism. In addition, it is known that self-efficacy varies depending on organizational characteristics, and therefore we need to take into consideration isolation from society and family, limited work space and invasion of privacy as well as smooth communication and leadership trust, in the crew organization. In order to achieve the above purpose, literature survey on the cultural and organizational characteristics self-efficacy and organizational commitment is conducted. The research model on the structural relationship among variables - organizational characteristics, self-efficacy and organizational commitment is established as follows. Foreign Crew’s Cultural and Organizational Characteristics Self-Efficacy Organizational Commitment Other Culture Acceptance Acculturation Communication Leadership Trust Psychological Tolerance Physiological Tolerance Job Satisfaction Commitment to the Organization Figure 1. The Research Model The following hypotheses are developed for the research objectives. Hypothesis 1: The foreign crew's cultural and organizational characteristics will have effect on the self-efficacy. Hypothesis 2: The foreign crew's self-efficacy will have effect on the organization commitment. Data were collected from 6 shipping companies in Korea such as Chang Myung Shipping, Panstar Shipping, SK Shipping, STX Pan Ocean, Hanjin Shipping, Hyundai Merchant Marine and 7 overseas crew manning agents in the Philippines, China, Myanmar, Vietnam and Indonesia with questionnaires made by the Likert scales. These collected data were analyzed by reliability analysis, confirmative factor analysis, and structural equation modeling analysis, etc. According to the results, hypothesis 1 and 2 were all supported with statistical significance. To conclude, this study suggests that foreign crew's self-efficacy should be firstly enhanced in order to improve organizational commitment on the vessel with combined crews. In conclusion, studies on self-efficacy of crew organization is urgently needed to enhance the effectiveness of an organization in a vessel with combined crews that has special environment - working environment with depression and uneasiness due to the exposure to the different culture and excessive stress from the social and psychological adaptation. Therefore, an attempt of this study is considered to be timely since there has not been a study on this subject so far and result of this study will contribute a lot to the organization management of a vessel with combined crews. For example, educational institutions training seamen in Korea also need to introduce new training programs with regards to leadership on the foreign crews with different cultures with accepting and adapting to the different cultures of foreign crews to meet globalization of labor market of crews and increasing trend of vessels with combined crews. And the results of this study also suggest that we need to strengthen foreign languages training with making allowance for the importance of communication. However, this study may have limitation since it analyzed only foreign crews in examining cultural and organizational characteristics and self-efficacy of vessels with combined crews. As cultural and organizational characteristics of foreign crews are visible when interacting with Korean crews who are on board of the same vessel, further studies on self-efficacy depending on cultural and organizational characteristics with targeting both Korean and foreign crews will be necessary. Although factors of onboard service tolerance that were set in this study are considered to be very important in the researches on crew organization, structural correlation between onboard service tolerance and other variables was proved to be not significant in this study. This was resulted from little difference in respondents' recognition on onboard service tolerance, and problems of crew organization arisen from onboard service tolerance were not diagnosed and analyzed accurately. Therefore, further studies examining relevance between onboard service tolerance and other organizational factors to be carried out by developing the tools to measure onboard service tolerance more accurately.
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자생차(Camellia sinensis L.)의 주요특성과 유연관계 분석에 관한 硏究
This study was carried out to investigate the geographical and ecological characteristics of self-sown teas in the southern southern part of South Korea and evolutionary relationship based on the RAPD analysis data. Each sample was collected from March, 2001 to October, 2002 along with basic characteristics of its cultivation. The results are described as follow : 1. The pH of soils in the habitat of collected green teas were 4.1~6.2. The highest pH(6.2) was shown from the soil of Naedae-ri while that of Dasa-ri showed the lowest pH value. 2. The highest content (319mg/kg) of P2O5 was examined from the tea of the Agricultural Research Extension Services (ARES) while the lowest values were obtained from the collected samples of Shonggwansa and Dasa-ri(20mg/kg). 3. In terms of geographical aspects, most of the areas that samples were collected are mountains with 220 meters above the sea level and are in the direction of the southern exposure and the southeast except Hyesan lecture hall and ARES. 4. In Shonggwangsa of Shunchon-si, Baebangsa and Dasolsa of Sacheon-si, Hyesan lecture hall of Miryang-si, Okcheon-sa of Goseong-gn and Boriam of Namhae-gn, the self-sown teas were a kind of bigger size of leaf than that of Yabukita. 5. The tea of Dasolsa had the longest leaf of 13.9cm, but the tea of Dosim tea plantation had the shortest leaf of 5.2cm. Baebangsa showed the broadest leaf width of 4.9cm, and Maeam tea plantation showed the narrowest leaf width of 2.1cm. 6. The tea of Baebangsa had 79 serrations of the largest number but Cheoneunsa had 50 serrations of the smallest number. 7. When the band pattern of the amplified DNA by PCR were compared, a size of the bands was between 300 and 3,000bp. The band image by area of gathering seeds was distinct. 8. There were the average number of 7.6 bands per primer. The number of total bands per 22 Primers were between 76 and 192 bands. 9. The result values of a flexibility analysis based on a similarity matrix value for the flexible relation analysis by RAPD UPGA, were attracted within 0.10 of inherited distance index. The collected species in Okcheonsa of Goseong-gn, Hyesan lecture hall and Eomgwangsa of Miryang-si were attracted within the inherited distance index of 0.25 and were all the kind of the big leaf.
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케이블용 무독성 난연 XLPE 컴파운드 특성과 조성물 연구
정영섭 韓國産業技術大學校 産業技術大學院 2005 국내석사
기존에 사용되고 있는 할로겐 난연재료 및 고분자 연소시 발암물질인 dioxine의 문제점이 대두되고 있어 유럽 국가를 중심으로 할로겐 난연제 사용을 규제하고 있다. 환경과 인체에 대한 안정성을 고려해서 저 유해, 저 발연화, 저 부식성, 리사이클링 등을 겸비한 제품의 개발로 관심이 모아지고 있는 실정이다. 본 연구에서는 환경친화적인 비 할로겐계 금속화합물중 수산화알루미늄 난연제를 전선 케이블에 사용하여 연소시 발생할 수 있는 난연성, 무독성, 소연성 등을 함량별로 확인하고 난연제 함량이 증가할 수 록 취약한 물리적, 열적특성보완을 위해 수가교 (moisture cure crosslikable) 기술로 취약해지는 케이블 절연층 또는 피복층의 특성을 향상 시키고자 하였다. 그러나 수산화알루미늄의 함량을 200 phr(part per hundred resin) 이상 증가시킬 경우 물리적 성질과 가교특성도 저하 되는 경향을 보이고 있으며 최적의 난연제 조성함량으로 약 150 phr 정도에서 우수한 결과를 확인하였다. 또한 moisture cure agent는 케이블 압출시 케이블 표면에 scorch(탄화) 현상이 나타날 수 있으므로 3 phr 범위에서 처방하는 것이 우수하다. 금속화합물의 수산화 알루미늄 난연 무독성 XLPE (cross linking polyethylene)컴파운드는 케이블 압출시 온도관리가 매우 중요하므로 이때 온도는 150℃ 이하로 유지해야한다. 온도가 높을 경우 탈수과정으로 인해 케이블 표면평활도 및 물리적 성질이 떨어져 케이블 특성을 유지 할 수가 없다. 본 연구에서는 난연 가교 컴파운드가 비 가교된 제품에 비해 열안정성, 내유성, 물리적 특성이 증가되는 것을 가열노화, 가열변형, 200℃ 18시간 내유침적시험, 상온 인장강도, 신장율 평가를 통해 입증할 수 있었다. The invention provides Non-toxic flame retardant XLPE compound. In developed country, they are restricted halogenated flame retardant because of Dioxin durining halogenated flame materials. Many researchers are focused on Non-toxic, an environmentally safe, low corrosion, recycling in wire and cable business. Morphology and properties of these compound materials have been studied with special Non-toxic flame retardant using metal composites compound, Aluminum tryhydroxide. Experimental values were compared with different theoretical models in flame retardant, Non-toxic flame retardant, Non-toxic and low smoke zero halogen. High filled metal composite compound in mechanical and morphological properties were observed in weakness properties. The effect of moisture cure cross - linkable compound increase the weakness properties in high filled metal composites compound in order to use cable insulation or jacket. Within the presented experiments, the metal composites, Aluminum tryhydroxide, are compound with polyolefin about 160 phr to be excellent properties in cable. If the ATH are over filled in compound, the resulting properties is weakness in cross - linkable and properties. Amount of moisture cure agent is proper within 3 phr. The result of over moisture cure agent formulation is happened surface scorch. Furthermore, the suitability of the processing Non-toxic flame retardant XLPE compound is less 150℃.
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