• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.567-570
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• 2000

A design method of nonlinear feedback shift registers that can produce maximal-period sequences is given. Such a design is based on one-to-one mappings which are similar to well-known chaotic maps. Some properties of generated binary sequences are investigated and discussed.

• Review of KIISC
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• v.5 no.3
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• pp.96-106
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• 1995

최근 국내에서도 디지탈 서명에 대한 공개 제안 및 공청회가 활발히 진행되고 있다. 본 고에서는 암호학의 선진 각국에서 제안되어 다방면으로 광범위하게 그 안전성 및 실용성이 논의된 RSA, ESIGN, Feige-Fiat-Shamir, Micali-Shamir, Guillou-Quisquater, Ohta-Okamoto, DSA, Schnorr, Oka등의 공개키 암호방식에 근거한 디지탈 서명 방식에 대하여 계산량 및 파라메터의 크기를 비교하고, 각각의 장단점을 분석하였다. 이는 향후 국내 디지탈 서명 방식의 표준 선정 작업시 보다 광범위한 검토가 필요함을 의미한다.

• Animal Systematics, Evolution and Diversity
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• v.12 no.4
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• pp.289-304
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• 1996

Notodelphyid copepods taken from Ascidians, Ascidia samea (Oka) and Ascidia sp. which had been collected in the East sea and the Korea Strait are reported. These copepods are Lonchidiopsis hartmeyeri Vanh ffen, 1917 and Pachypygus curvatus Ooishi 1961, and are redescribed as new records to the Korea fauna.

• Proceedings of the Korean Vacuum Society Conference
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• 2007.08a
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• pp.184-184
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• 2007

• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.201-207
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• 2018

A genome contains all genetic information of an organism. Within a specific species, unique traits appear for each individual, which can be identified by analyzing nucleotide sequences. Many Genome-Wide Associations Studies have been carried out to find genetic associations and cause of diseases from slightly different base among the individuals. It is important to identify occurrence of slight variations for polymorphisms of individuals. In this paper, we introduce an analysis and visualization tool for specific variation pattern identification of polymorphisms in nucleotide sequences and show the validity of the tool by applying it to analyzing nucleotide sequences of subcultured pOka strain of varicella-zoster virus. The tool is expected to help efficiently explore allele frequency variations and genetic factors within a species.

• Pediatric Infection and Vaccine
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• v.7 no.1
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• pp.129-135
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• 2000

Purpose : We previously reported the short-term immunogenecity and safety of 47 passaged Oka strain live attenuated varicella vaccine in healthy children in 1997. Now, we conducted this two-year follow-up study to confirm the maintenance of immunity, the occurrence of natural varicella infection and the activation of vaccine induced latent infection on the same vaccine. Methods : 99 children who had been immunized by 47 passaged Oka strain live attenuated varicella vaccine in 1997 were followed up by questionnaire, and 46 children out of study group were followed up serologically. They were asked to report any instance of varicella or herpes zoster since they had been immunized. If there was any evidence of varicella or herpes zoster, they should be clinically or serologically confirmed by doctor. Also, those patients' parents were asked to report any instance of varicella or herpes zoster in their family, playmate, kindergarten, school, or other settings. The immunity to VZV was confirmed by EIA and FAMA test. Results : 6 recipients developed breakthrough varicella after exposure to VZV in family, kindergarten and school during follow-up period. However, clinical features of those patients were very mild and self limited without therapy. And none of the recipients developed herpes zoster during this observation period. The results of EIA test showed that study subjects were all seropositive except one, and the antibody titers and GMT of FAMA test were seropositively maintained in all subjects. Statistically, the antibody titers of EIA and FAMA test confirmed two years after vaccination were higher than those results confirmed one month after vaccination. Conclusion : Our study results suggest that the immunity of 47 passaged Oka strain live attenuated varicella is well maintained until 2 years later after vaccination, and mild natural infection after exposure to VZV can be occurred with low rate. There were not developing zoster in study vaccine after vaccination for two-years.

• Pediatric Infection and Vaccine
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• v.4 no.2
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• pp.257-264
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• 1997

Purpose: We performed this study to find out short period humoral immunogenicity and safety of 47 passaged Oka strain live attenuated varicella vaccine(1,400PFU) in 12 months to 15 years aged healthy children. Methods: Ninety nine healthy chidren, who have no histories of varicella vaccination, recent chicken pox illness and contact, allergy to other vaccines and underlying severe diseases, were involved in this study from April 1997 to August 1997. 5ml blood were collected before vaccination and after vaccination from all vaccinees to measure varicella membrane antibody by FAMA, and varicella IgG antibody by EIA. And immediate reactions within 30 minutes after vaccination, local and systemic reactions within 3 days after vaccination and vaccine induced systemic illness during 6 weeks postvaccination period were observed in all vaccinees to identify side effects of study vaccine. Results: 1) 49 seronegative and 50 seropositive vaccinees were identified in both prevaccination serologic tests. 2) Serologic responses after vaccination measured by the FAMA in seronegative group showed that the mean GMT level revealed 64.0, and seroconversion rate was 97.9%. And serologic responses after vaccination measured by the FAMA in seropositive group showed that the mean GMT level(242.2) was markedly elevated comparing with the mean GMT level(9.2) of pre vaccination. 3) The results of EIA in seronegative group revealed that postvaccination mean GMT was 435.2(prevaccination GMT; 78.7), and 100% seroconversion rate. Also, the results of EIA in seropositve group showed that the mean GMT level(769.9) of postvaccination was almostly two fold hihger than the mean GMT level(419.7) of prevaccination. 4) Observed local reactions like injection sites redness, pain, hardness and itching sense were mild and disappeared within 3 days, also shorterm systemic reactions like irritability, lethargy, poor appetites and rash were not remarkable. And there were no remarkable side effects due to vaccine during study period in all vaccinees. Conclusion: We confirmed that 47 paasaged Oka strain live attenuated varicella vaccine has high shorterm humoral immunogenicity and safety. However, we need more detail and longterm humoral and cell mediated immunogenicity studies of this vaccine including clinical field trials.

• Journal of The Korean Astronomical Society
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• v.38 no.2
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• pp.257-260
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• 2005

We have mapped the W 3 giant molecular cloud in the $C^o\;^3P_1-^3 P_o$ ([CI]) line with the Mount Fuji Submillimeter-wave Telescope. The [CI] emission is extended over the molecular cloud, having peaks at three star forming clouds; W 3(Main), W 3(OH), and AFGL 333. The [CI] emission is found to be strong in the AFGL 333 cloud. We have also observed the $C^{18}O,\;CCS,\;N_2H^+$, and $H^{13}CO^+$ lines by using the Nobeyama Radio Observatory 45 m telescope. In the AFGL 333 cloud, we find two massive cores, which are highly gravitationally bound and have no sign of active star formation. The high [$C^o$]/[CO] and [CCS]/[$N_2H^+$] abundance ratios suggest that the AFGL 333 cloud is younger than the W 3(Main) and W 3(OH) clouds.

• Journal of Engineering Education Research
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• v.13 no.5
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• pp.49-54
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• 2010

We report about the international cooperative activities for the engineering education between a German University and a Japanese University. After the experiences for 15 years of cooperation, both in research and student exchange, we learned a lot about the differences between these two educational systems. This report summarizes the differences and the future perspective for the improvement of engineering education based on the understanding of the differences, including advantages and disadvantages, between two educational systems.

• Animal Systematics, Evolution and Diversity
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• v.30 no.2
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• pp.87-94
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• 2014

Specimens of the genus Orobdella Oka, 1895 from Korea, including various locations in the Korean Peninsula, were identified as Orobdella tsushimensis Nakano, 2011. Phylogenetic analyses using mitochondrial cytochrome oxidase subunit 1 (COI), ND1, $tRNA^{Cys}$, $tRNA^{Met}$, 12S rRNA, $tRNA^{val}$, and 16S rRNA markers show that the newly collected specimens form a monophyletic group with the known O. tsushimensis specimens. The genetic distance of COI of these specimens was in the range 0.4-6.6%. These results confirm that the newly collected specimens belong to O. tsushimensis. This is the first record of the genus Orobdella from the Korean Peninsula.