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임화정,전진순,이헌길 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B
The wireless sensor network consists of a number of sensor nodes which have physical constraints. Each sensor node senses surrounding environments and sends the sensed information to Sink. The inherent vulnerability in security of the sensor nodes has promoted the needs for the light weight security protocol. In this paper, we propose a non-hierarchical sensor network and a security protocol that is suitable for monitoring the man-made objects such as bridges. Furthermore, we present the efficient way of setting the routing path by storing IDs, MAC(message authentication code) and the location information of the nodes, and taking advantage of the two node states, Sleep and Awake. This also will result in the reduced energy consuming rate.
아고용한 Zr-Nb 2원계 합금의 미세조직 및 부식특성
林潤洙,崔洋鎭,河憲永,魏明鏞 大田産業大學校 2000 한밭대학교 논문집 Vol.17 No.1
Effect of niobium content on the microstructure and corrosion characteristic of hypo-solubility in binary Zr-Nb alloys were studied. The specimens with 0.2 and 0.4wt.% of niobium were prepared under various annealing temperatures from 400℃ to 800℃ and times from 30 to 5.000 minutes after vacuum arc remelting. The microstructures behavior was observed by a polarized optical microscope. TEM and micro-vickers hardness tester. The recrystallization temperature of the alloys slightly increased with niobium content due to increase of activation energy. The grain growth of the alloys more 0.2 than 0.4 wt.% of niobium occured rapidly. The specimens for corrosion test were prepared by annealing with 590℃ for 2hr to be recrystallized and performed in distilled water at 360℃ using a static mini-autoclave and the corrosion characteristic was measured by weight gains with exposure time. With increasing Nb content from 0.2 to 0.4wt.% the corrosion resistance in Zr-xNb binary alloys decreased an d oxide structure was slowly transformed from tetragonal -ZrO2 to monoclinic-ZrO2.
중소기업에 있어서 효과적인 ERP 패키지 선정을 위한 방법론과 Web-based DSS개발에 관한 연구
김진수,임세헌 중앙대학교 산업경영연구소 1999 산업경영연구 Vol.8 No.2
정보기술의 발달과 중요성이 증대됨에 따라 신속하게 정보시스템 구현이 가능한 ERP(Enterprise Resource Planning) 패키지 도입에 대한 관심이 증대되고 있다. 특히, 대기업에 비하여 자금력, 기술력, 전문인력 면에서 열세인 중소기업에서 ERP 패키지 도입에 많은 관심을 가지고 있다. 하지만, 체계적인 ERP 패키지 도입을 위한 효과적이고 구체적인 방법론이 부족하여 많은 중소기업들이 ERP 도입을 지원할 수 있는 보다 체계적인 ERP 패키지 평가요소와 방법론 개발이 시급한 실정이다. 따라서, 본 연구의 목적은 중소기업이 보다 쉽고 체계적으로 ERP 패키지를 평가할 수 있는 평가요소 및 방법론을 개발함으로써 중소기업의 성공적인 ERP 도입에 기여하고자 한다. 또한, 이를 웹에 기반을 둔 의사결정지원시스템의 기본설계를 제공함으로써 사용자들이 보다 쉽게 의사 결정을 할 수 있는 시스템 개발에 기여하고자 한다. Many enterprise are interested in building ERP (Enterprise Resource Planning) system because of its rapid development of management information systems. Especially, small and medium size enterprises are more concern about ERP package. Even though there are many successful cases of building ERP systems, however, many cases are also failed due to lack of a systematic evaluation methodology. Therefore, the purpose of this study is to develop a systematic evaluation methodology of ERP package and a framework of Web-based DSS (Decision Support Systems) for evaluation.
채영진,신창환,임현택,여성원,한성규,이재원,정헌영,금경수 한국전통의학연구소 2003 한국전통의학지 Vol.13 No.1
Five elements motion and six kinds of natural factors influence not only human disease but also difference of medicine effect. Because the climate of summer is very hot, that is easy to increase the properties of hot medicines, a doctor must be careful to use it in summer. Also the climate of winter is very cold, that is easy to increase the properties of cold medicines, a doctor must be careful to use it in winter. But in the certain conditions to use diaphoretics or purgatives, in spite of that regulation a doctor can use them.
김유민, 이한주, 오진헌, 임기조 충북대학교 컴퓨터정보통신연구소 2012 컴퓨터정보통신연구 Vol.20 No.1
In this paper, a novel type ultrasonic linear motor is proposed. The proposed motor consists of a ring type stator and a mover. They have spirals on their inner and outer surface, respectively. Along the spiral, a mover is travelled by a travelling extensional vibration mode of a ring type stator. Hence, a linear up-and-down motion is possible. Through the experimental results, we can verify the applicability regarding the autofocus lens driver. keywords : Ultrasonic linear motor, Autofocusing driver, ring type stator
Lim, Tae-Heon,Kim, Jin-Ho,Cha, Byeong-Jin The Korean Society of Plant Pathology 2006 Plant Pathology Journal Vol.22 No.1
The population shifts of Monilinia fructicola isolates which were resistant to the fungicide benzimidazoles were investigated in four regions of Korea from 1998 to 2000. The isolation frequency of benzimidazole-resistant isolates ranged from 18.8% to 29.6% in Chongdo and from $22.0\%$ to $26.8\%$ in Gyeongsan during the same period. However, the frequency of benzimidazoleresistant isolates was less than $4.0\%$ in Chochiwon and Youngduk during the same period. Benzimidazoleresistant isolates showed cross-resistance among benzimidazoles. On the other hand, none of the isolates showed cross-resistance to diethofencarb and carbendazim. Regardless of the year, the benzimidazole-resistant isolates of $EC_{50}$ higher than 500 $\mug%$ a.i./ml were isolated more frequently in mid and late season than in early season. In an orchard of Gyeongsan that had not been exposed to any fungicides for several years, the population of benzimidazole-resistant isolate had persisted without much fluctuation for three years. These results suggest that benzimidazole resistance of M. fructicola is becoming a problem in controlling brown rot and blossom blight of peach in regions like Chongdo and Gyeongsan.
Isolation and Identification of Colletorichum musae from Imported Bananas
Lim, Jin-Young,Lim, Tae-Heon,Cha, Byeong-Jin The Korean Society of Plant Pathology 2002 Plant Pathology Journal Vol.18 No.3
Colletotrichum musae was isolated from dark-brown anthracnose lesions on commercial banana (Musa sapientum L.) to establish the causal agent of the symptom. The fungus grew fast and produced white aerial mycelium on PDA. Acervuli developed abundantly on culture plates after incubation for 10 days at $25^{\circ}C$. Pinkish conidial masses were produced on the acervuli, which mostly coalesced together, Conidia were aseptate, hyaline, straight, ellipsoid to globose, and 14.5$\times$6.9 $\mu\textrm{m}$ in size. Black, clavate, round, or irregular-shaped appressoria measuring 8.8$\times$6.8 $\mu\textrm{m}$ were readily formed from germ tubes. Setae-like structures were not found either on the lesion or on the cultures. Sclerotia were also absent. Among the media, PDA medium was the best for mycelial growth. The optimum temperature for mycelial growth was $28^{\circ}C$, while the optimum pH ranged from pH 5.5 to 6.5. The isolates of C musae caused black necrotic lesions on banana fruits by needle-wound inoculation, and orange-colored spore masses were produced on the lesions. The fungus also caused discoloration on apple fruits inoculated.