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Ad-hoc Security Authentication Technique based on Verifier (검증자 기반 Ad-hoc 보안 인증기법)

  • Lee, Cheol-Seung;Hong, Seong-Pyo;Lee, Ho-Young;Lee, Joon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2007.10a
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    • pp.713-716
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    • 2007
  • This paper suggests One-time Password key exchange authentication technique for a strong authentication based on Ad-hoc Networks and through identify wireless environment security vulnerabilities, analyzes current authentication techniques. The suggested authentication technique consists of 3 steps: Routing, Registration, and Running. The Routing step sets a safe route using AODV protocol. The Registration and Running step apply the One-time password S/key and the DH-EKE based on the password, for source node authentication. In setting the Session key for safe packet transmission and data encryption, the suggested authentication technique encrypts message as H(pwd) verifiers, performs key exchange and utilizes One time password for the password possession verification and the efficiency enhancement. EKE sets end to end session key using the DH-EKE in which it expounds the identifier to hash function with the modula exponent. A safe session key exchange is possible through encryption of the H(pwd) verifier.

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Yield and Bioactive Component on Different Compost Amounts and Cultural Methods of Saururus chinensis $B_{AILL}$ (퇴비 시용량과 재배방법에 따른 삼백초의 수량 및 약리성분 함량 차이)

  • Lee, Seong-Tae;Lee, Young-Han;Choi, Yong-Jo;Lee, Yong-Ho;Cho, Ju-Sik;Heo, Jong-Soo
    • Korean Journal of Medicinal Crop Science
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    • v.9 no.3
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    • pp.220-224
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    • 2001
  • To obtain the basic information for commercial process and high quality production of Saururus chinensis, the yield and the contents of available component were determined at different compost application amounts and cultural methods. Fresh weight of aerial part was increased by increasing of the compost application amounts. The contents of quercetin, quercitrin and tannin were the highest in the compost 2,000kg/10a. Fresh weight of aerial part at different cutting times was no difference between one harvesting/year and two harvesting/year in S. chinensis. On occasion of two harvesting/year, the contents of component was more collected on July 16 than collected on October 16. Fresh weight of aerial part was less in the field than in the greenhouse culture method, but the contents of quercetin, quercitrin and tannin were more in the field than in the greenhouse culture method.

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Realities of Environmental Education and Program Oriented Social Studies (우리나라 초등학교 환경교육의 목표와 내용분석)

  • Park, Soon-Ho;Youn, Seong-Ja
    • Journal of the Korean association of regional geographers
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    • v.11 no.2
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    • pp.247-262
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    • 2005
  • Environmental education has been introduced in elementary education in the early 1980s; while, environmentally responsible behavior was not improved as much as the educators expected. This paper analyzed the contents of environment education in the textbooks and objectives of the teacher's guidebooks in the seventh national curriculum. The proportion of cognitive objectives were higher than affective ones. Environment preservation and countermeasure, natural environment, environment pollution were overemphasized in all grades. The contents of environmental education were not progressed; it did not follow the spiral curriculum. Social studies dealt with on built environment, population, industrialization and urbanization, resources that the other subjects did not much concern on. Geographic area in social studies was well fit to teach environment as a holistic approach. Environmental programs oriented geographic area within social studies could help to conduct outdoor activities in the residential areas; therefore, environmentally responsible behavior would be improved.

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Match Injuries Related to Adolescent Taekwondo Athletes (성장기 태권도 선수의 경기 손상)

  • Kim, Seong-Tek;Kim, Chang-Yoon;Sin, Hyun-Ho
    • Journal of Korean Orthopaedic Sports Medicine
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    • v.6 no.2
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    • pp.99-104
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    • 2007
  • Purpose: To research match injuries related to Taekwondo in adolescent athletes and find out preventing injuries. Materials and Methods: We analyzed 162 match injuries of middle and high school athletes, who were surveyed in 2005 and 2006 national tournament. Results: Among 162 match injuries, injuries in foot and hand were the most common and there were 35 cases in serious injuries such as fracture, open dislocation, open fracture of epiphyseal plate and so on. The very fast speed and destructive power of Takwondo athlete can cause open dislocation of great toe and can cause fracture of foot and upper extremity when kicking. Conclusion: We consider that injured athletes need proper treatments and sufficient rest not to accumulate training injuries and match injuries and need to improve mats of stadium, braces for feet and hands and put on braces for elbows to prevent match injuries.

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Serologic survey of the ruminant bacterial infectious diseases in farmed deer and wild water deer in Jeonbuk province (사육사슴 및 야생고라니에서 소 세균성 전염병에 대한 혈청학적 연구)

  • Jo, Young-Suk;Chung, Yun-Shin;So, Seung-Young;Seol, Min-Suk;Cho, Ho-Seong;Kim, Bum-Seok;Lim, Chae-Woong
    • Korean Journal of Veterinary Service
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    • v.33 no.3
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    • pp.249-254
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    • 2010
  • Deer can be one of the susceptible animals to bovine infectious diseases, and thus, may play a role either as a reservoir or amplifier host for spreading the diseases to other species such as cattle and goat. This study was conducted to determine the serum antibodies to bacterial infectious diseases for brucellosis, tuberculosis (TB), paratuberculosis (Johne's disease) in deer. Serum samples were randomly collected from 78 deer from 31 farms at Jeonbuk province, and 7 wild water deer from Jeonbuk wild animal treatment center during 2005 to 2007, respectively. Four farm deer (5.1%) showed antibodies to tuberculosis using Antigen Rapid Bovine TB Ab Test Kit. One elk (1.3%) and one wild water deer had antibodies for paratuberculosis. Antibody against Brucellosis was not detected in tube agglutination test (TAT) and enzyme-linked immunosorbent assay (ELISA). These data suggest that caution should be applied to inspection of velvet, deer blood and meat for human consumption from deer because of zoonotic bacterial diseases in deer. In addition, farmed deer can be a transmissible host for zoonotic disease to diary or raising farm.

Serosurvey for antibodies against Neospora caninum in farmed deer and wild water deer in Jeonbuk province (사육사슴 및 야생고라니의 Neospora caninum에 대한 항체가 조사)

  • Jo, Young-Suk;Lee, Jeong-Won;Chung, Yun-Shin;So, Seung-Young;Park, Hyun-Jong;Cho, Ho-Seong;Kim, Bum-Seok;Lim, Chae-Woong
    • Korean Journal of Veterinary Service
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    • v.33 no.3
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    • pp.271-274
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    • 2010
  • With deer farming now becoming recognized as one of the alternative livestock farming practices, there has been much attention on infectious diseases of cattle, but less awareness of these diseases in deer. Serum samples were randomly collected from 78 deer from 31 farms and 7 wild water deer from wild animal medical center during 2005 to 2007, respectively. A total 85 sera were tested for Neospora caninum antibodies by ELISA. Fourteen farmed deer(17.9%) were positive to N. caninum but no antibodies were found in sera from wild water deer. The sera from all of the area for these study showed positive in the range from 6.7 to 30.7%. On the basis of these study, farmed deer in Jeonbuk province were exposed extensively and seriously to N. caninum which might present a risk to other species included cattle and dog.

Enhanced Cytotoxicity of 5-FU by bFGF through Up-Regulation of Uridine Phosphorylase 1

  • Im, Young-Sam;Shin, Hea Kyeong;Kim, Hye-Ryun;Jeong, So-Hee;Kim, Seung-Ryul;Kim, Yong-Min;Lee, Do Hyung;Jeon, Seong-Ho;Lee, Hyeon-Woo;Choi, Joong-Kook
    • Molecules and Cells
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    • v.28 no.2
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    • pp.119-124
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    • 2009
  • Anti cancer agent 5-FU (Fluoro Uracil) is a prodrug that can be metabolized and then activated to interfere with RNA and DNA homeostasis. However, the majority of administered 5-FU is known to be catabolized in vivo in the liver where Dihydropyrimidine dehydrogenase (DPD) is abundantly expressed to degrade 5-FU. The biological factors that correlate with the response to 5-FU-based chemotherapy have been proposed to include uridine phosphorylase (UPP), thymidine phosphorylase (TPP), p53 and microsatellite instability. Among these, the expression of UPP is known to be controlled by cytokines such as $TNF-{\alpha}$, IL1 and $IFN-{\gamma}$. Our preliminary study using a DNA microarray technique showed that basic fibroblast growth factor (bFGF) markedly induced the expression of UPP1 at the transcription level. In the present study, we investigated whether bFGF could modulate the expression of UPP1 in osteo-lineage cells and examined the sensitivity of these cells to 5-FU mediated apoptosis.

Characteristics of the Gasification from Mixed Fuels of Charcoal and Undried Woodchip (미건조 우드칩과 숯 혼합에 따른 가스화 특성 분석)

  • Wang, Long;Kang, Ku;Lee, Tae Ho;Choi, Sun Hwa;Hong, Seong Gu
    • Journal of The Korean Society of Agricultural Engineers
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    • v.57 no.5
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    • pp.81-88
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    • 2015
  • 바이오매스는 유망한 신재생 에너지이다. 바이오매스는 액체 및 기체 연료로 전 환 할 수 있고, 다양한 공정을 통해 열 및 전력을 생산시키는데 사용된다. 바이오매스 가스화 공정은 바이오매스를 일산화탄소, 이산화탄소, 수소 및 메탄으로 이루어진 합성 가스로 전환시키는 기술이다. 바이오매스를 이용한 합성 가스 생산 및 활용은 세계적으로 늘어나는 에너지 필요성을 충족시킬 수 있는 대체에너지이다. 현재, 바이오매스 가스화의 주요 원료는 목질계 우드 칩을 주로 사용하고 있지만, 일반적으로 우드칩의 경우 수분을 다량 함유하고 있기 때문에 가스화 공정을 위해서는 별도의 건조처리를 필요로 한다. 우드칩의 건조에는 많은 에너지가 소요되고, 다량의 우드칩 건조에는 시간과 기상 및 공간적인 환경에 영향을 받는다. 본 연구에서는 미건조 우드칩의 가스화 공정을 위하여 미건조 우드칩에 숯을 각각 10, 30, 50 % 비율로 혼합하여 실험을 수행하였고, 실험결과 생산된 합성가스의 CO 농도 는 숯의 비율에 따라 14.9 ~ 25.6 % 증가되는 경향을 나타내었지만, 반대로 $CO_2$$CH_4$ 농도는 감소하였다. 이에 따라 합성가스 생산을 위한 미건조 우드칩과 숯의 최적혼합비율은 약 30 %로 판단되며, 발열량은 $1285.7kcal/Nm^3$, Gas yield는 $2.3Nm^3/kg$ 로 나타났다. 이에 적절한 숯의 혼합사용은 미건조 우드칩의 직접적인 가스화에 도움이 될 것으로 사료되며, 바이오매스 건조 공정에 필요한 에너지를 절약할 수 있을 것으로 판단된다.

Developmental and Morphological Characterization of the Wild Silkmoth, Actias gnoma, in Korea

  • Ryu, Chun-Woo;Kim, Mi-Ae;Park, Nam-Sook;Sohn, Hung-Dae;Park, Sang-Bong;Lee, Ho-Oung;Moon, Jae-Yu;Seong, Su-Il
    • International Journal of Industrial Entomology and Biomaterials
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    • v.5 no.1
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    • pp.79-83
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    • 2002
  • The wild silkmoth, Actias gnoma was firstly collected at Suwon located in the middle part of Korea. The developmental and morphological characteristics of A. gnoma reared under the laboratory conditions were analysed. The egg shape was shorter elliptic. The major and minor diameter of the eggs were 2.04 mm and 1.83 mm, respectively. White mucous material was remained inside the eggs after hatching. Also, the body color of the larvae was completely changed from dark brown to light yellowish-green at the 3rd instar, but it did not occur until pupation. In the feeding test on several plants, the oak tree, Quercus acutissima, was newly identified as a host plant. The final larval instar was mostly 6th, but in some larvae it was 7th. A few of larvae ate their own casts just after ecdysis. The whole larval duration ranged from 45 to 59 days. The single cocoon weight, cocoon shell weight and cocoon shell percentage were 1.65 g,31.3 cg and 18.9%, respectively, The cocoon shape and color were spindle and light brown, respectively. The morphology of the silk gland was greatly different from those of Bombyx mori, Antheraea yamamai and Antheraea peryi: the thickness of the middle and posterior silk glands was almost identical.

Measurement of Isochromatic Fringe Distribution of a TV Glass Panel by Use of Photoelastic 4-step Phase Shifting Method (광탄성 4단계 위상이동법을 이용한 TV유리패널의 등색프린지 분포측정)

  • Baek, Tae-Hyun;Kim, Myung-Soo;Cho, Seong-Ho
    • Journal of the Korean Society for Nondestructive Testing
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    • v.25 no.1
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    • pp.1-8
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    • 2005
  • This paper presents the experimental results measured by photoelastic 4-step phase shifting method for the isochromatic fringe distribution in a TV glass panel. In the conventional photoelastic method, the isochromatic fringe orders are measured manually point by point. The 4-step phase shifting method uses four images obtained from a circular polariscope by rotating the analyzer to $0^{\circ},\;45^{\circ},\;90^{\circ}$, and $135^{\circ}$. In order to use the 4-step phase shifting method, the elements of a polariscope should be aligned to isoclinic direction at a point and/or along a line where isochromatic fringe distribution is measured. Experimental results obtained from the 4-step phase shifting method are compared with those measured by the Senarmont compensation method. Both results are well agreed. Then, isochromatic fringe distributions in the TV glass panel that is heat-treated before and after are compared. Maximum and minimum isochromatic fringe orders in the TV glass panel with before- and after-heat treatment are changed approximately two times.