• 대한전자공학회논문지TC
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• 제44권3호
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• pp.85-91
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• 2007

위성 DMB는 이동성과 휴대성을 목표로 언제 어디서나 시청이 가능한 방송/통신 융합의 서비스로 현재 11개의 비디오 채널과 26개의 오디오 채널을 통해 각종 컨텐츠를 제공하고 있다. 하지만 최근들어 휴대형 단말의 멀티미디어 서비스의 수요가 증가함에 따라 위성 DMB는 고품질 및 새로운 서비스를 요구하고 있다. 따라서 현 위성 DMB 시스템을 좀 더 효율적으로 제공하기 위해서 채널수를 확보하거나 전송품질을 향상시킬 필요성이 있다. 본 논문은 계층적 8-PSK 변조 방식을 적용하여 현재의 시스템과 새로 추가된 시스템을 동시에 지원할 수 있는 역호환 방식의 위성 DMB 시스템을 제안한다. 또한 새로운 시스템의 질 좋은 서비스를 제공하기 위해 강력한 채널 부호화 방식을 제안하고 컴퓨터 시뮬레이션을 통해 위성 DMB 시스템의 고도화 가능성을 검증한다.

• Tuberculosis and Respiratory Diseases
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• 제69권5호
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• pp.361-367
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• 2010

Background: Difficult-to-treat asthma afflicts a small percentage of the asthma population. However, these patients remain refractory to treat, and account for 40% to 50% of the health costs of asthma treatment, incurring significant morbidity. We conducted a multi-center cross-sectional study to characterize difficult-to-treat asthma in Korea. Methods: Subjects with difficult-to-treat asthma and subjects with controlled asthma were recruited from 5 outpatient clinics of referral hospitals. We reviewed medical records of previous 6 months and obtained patient-reported questionnaires composed of treatment compliance, asthma control, and instruments for stress, anxiety, and depression. Results: We recruited 21 subjects with difficult-to-treat asthma and 110 subjects with controlled asthma into the study. The subjects with difficult-to-treat asthma were associated with longer treatment periods, more increased health care utilization, more medication (oral corticosteroids, number of medication), and more anxiety disorder compared to those of well-controlled asthmatics. There was no difference in age, gender, history of allergy, serum IgE, blood eosinophil count, or body mass index between the 2 groups. Conclusion: Difficult-to-treat asthma is characterized by increased health care utilization and more co-morbidity of anxiety.

• 대한본초학회지
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• 제27권3호
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• pp.75-82
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• 2012

Objective : In the present study, we investigated the pharmacological profile of the aqueous extract of $Patrinia$ $scabiosaefolia$ Fischer ex Link (EPS) and $Patrinia$ $villosa$ Jussieu (EPV) for its anti-asthmatic activities. The purpose of this study is to ascertain if EPS result in better anti-asthmatic activities and functional outcome as compared with EPV. Methods : In this study, BALB/c mice were systemically sensitized to ovalbumin (OVA) followed intratracheally, intraperitoneally, and by aerosol allergen challenges. We investigated the effect of EPS, EPV on the recruitment of pulmonary inflammatory cells, various immune cell phenotypes, Th1/Th2 cytokine gene expression and production and histamine production in serum. Results : In BALB/c mice, we found that EPV-treated groups had more effectively suppressed inflammatory cell infiltration of lung and BALF, B220+IgE+, CD11b+Gr-1+ cell population in lung and these occurred by suppressing the gene expression of IL-4, IL-5 and IL-4 cytokine production in BALF and serum. Conclusions : These results suggest that EPV may play an important role in the control of anti-asthmatic activities by down-regulation of Th2 cytokine (especially IL-4, IL-5). In general, EPV has shown a better anti-asthmatic activities compared to EPS.

• KSBB Journal
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• 제9권1호
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• pp.16-25
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• 1994

Bacillus subtilis를 재조합 이종 단백질 생산 균주로 만들기 위하여 포자형성 변이주를 만들었다. 균주는 두 개의 프로테아제가 제거된 균주인 DB104로부터 spoOJ와 spoIIG 변이주를 유전자 조작법에 의해 만들고 두 개의 유전자가 모두 제거된 균주도 만들었다. 이에 목적 aprE 유전자를 삽입 벡터 형태로 만들어 integration시킨 뒤 변이주 각각의 형태적인 변화를 투과성 전자현미경으로 살펴 보았다. 각각 변이주의 모습은 이전에 보고된 것과 거의 일치하였으며 spoOJ spoIIG 이중포자변이주의 경우는 spoIIG 변이주와 더욱 닮은 것을 알 수 있었으며, 훨씬 주름진 것과 같은 투박한 세포벽 및 막을 가지고 있음을 관찰하였다. spoOJ 변이는 포자형성 빈도를 낮추고 aprE 활성을 감소시키는 반면, spoIIG 변이는 포자형성을 거의 하지 않으면서 aprE 활성에 상승효과를 가져왔다. spoOJ와 spoIIG 이중포자변이주는 spoOJ 변이의 효과는 거의 나타나지 않은채, spoIIG와 비슷한 aprE 활성을 보였다.

• Journal of Periodontal and Implant Science
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• 제26권4호
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• pp.1003-1012
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• 1996

The induction of a phenotype with preoperties may have clinical significance in the acceleration of the wound-healing process. Wound contraction involves a specialized cell known as the myofibroblast. The myofibroblasts can be identified by their intense staining of actin bundles with anti-actin antibody. Tissue-specific actin distribution is correlated with the contractile activity of the myofibroblasts and smooth muscle etc. This study was performed to determine the expression of actin filaments in the cytoplasm of cultured human gingival fibroblsts after GaAs laser(BIOSAER, Korea) irradiation. Human gingival fibroblasts were cultured from explants of normal interdental gingival tissue. The third-generation fibroblasts were used for immunohistochemical study. The cultured fibroblasts were exposed $0.53joule/cm^2$(lmW, 7 mimutes) of energy density, and then observed by immunohistochemical method using, rabbit anti0gelsolin, hen smooth muscle polyclonal antibody(Chemicon international inc.), and biotinylated goat anti-rabbit IgG(Vectastain) 24-, 36-, 48-hour after laser irradiation Following results were obtained ; 1. In nonirradiated cultures, round shaped active fibroblasts with abundant cytoplasm and prominet nucleoli were observed. 2. In 24- and 36-hour cultures after laser irradiation, spindle shaped cells with long process were observed. The intensity of stain was seen in cytoplasm of these modified fibroblasts. 3. In 48-hoour cultures after laser irradiation, stained spindle shape cell were not observed. The results suggest that the effect of the galium-arsenide laser treatment on cultured gingival fibroblasts is the rapid development of cytoplasmic actin filaments.

• Tuberculosis and Respiratory Diseases
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• 제66권5호
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• pp.380-384
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• 2009

비소세포폐암의 일차치료로 사용되고 있는 항암치료제인 docetaxel은 세포주기 정체를 통한 세포자멸을 야기하는 약제로 이로 인한 누클리오좀 유리가 약제유발 홍반루푸스의 원인으로 추정되고 있으나 실제 docetaxel로 야기된 아급성 피부 홍반루푸스의 증례는 지금까지 전세계적으로 4명의 증례 보고만이 있을 뿐이며 국내에서는 아직까지 보고된 바가 없다. 저자들은 비소세포폐암 환자에서 docetaxel과 cisplatin 병합 항암 화학요법 도중 발생한 아급성 피부 홍반루푸스 1예를 경험하였기에 이를 보고하는 바이다.

• BMB Reports
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• 제31권5호
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• pp.519-523
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• 1998

We have previously reported that anti-glucose-6-phosphate dehydrogenase (G6PD) serum raised against native G6PD (nG6PD) enzyme recognized nG6PD antigen poorly in competitive enzyme-linked immunosorbent assay (ELISA) (Kim, 1997). In the present study, we investigated whether anti-G6PD serum raised against nG6PD can react with denatured G6PD effectively in competitive ELISA. We used partially active G6PD (paG6PD) by repeated freeze-thawing or SDS-denatured G6PD (SDS-G6PD) as both immobilized and soluble antigens, and anti-G6PD serum raised against nG6PD for competitive ELISA. The polystyrene cuvettes coated with either paG6PD or SDS-G6PD were challenged with a mixture of a limiting amount of anti-G6PD serum and various doses of paG6PD or SDS-G6PD as competitors, followed by incubation with alkaline phosphatase-anti-IgG conjugate. The competitive ELISA with paG6PD or SDS-G6PD antigen exhibited the sigmoidal dose-response curve characteristic of competition immunoassays. Furthermore, Triton-denatured G6PD (Triton-G6PD) was used in competitive ELISA. The paG6PD, SDS-G6PD, or Triton-G6PD used as competitors increased the inhibition of antibody binding to immobilized either of nG6PD or denatured G6PD compared with nG6PD competitor. The inhibition by denatured G6PD competitors was more pronounced at high competitor concentrations than at low counterparts. We conclude that anti-G6PD serum raised against nG6PD can effectively react with denatured G6PD in competitive ELISA and that our anti-G6PD serum recognizes denatured enzymes better than active enzymes.

• 동의생리병리학회지
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• 제23권2호
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• pp.343-350
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• 2009

This study aimed to evaluate the anti-asthmatic effects of Samjajihwang-tang (SJT) using OVA-induced asthmatic mice model. Asthmatic mice model was conducted by repeated challenge of OVA using C57BL/6 mice. Each group was treated with distilled water, SJT (400 mg/kg and 200 mg/kg) extract or cyclosporin A (10 mg/kg) for the later 8 weeks, Penh (plethysmography and enhanced pause), immune cells subpopulation, eotaxin, IL-5, TNF-${\alpha}$, Anti-OVA-lgE in BALF (bronchoalveolar lavage), and lung tissue was analyzed, No cytotoxicity of SJT was shown on hFCs (human fibroblast cells). Administration of SJT significantly decreased Penh levels comparing to control group. SJT treatment significantly ameliorated the increase of total cells number and eosinophil including of immune cell subpopulation of $CD3^+/CD69^+$, $CCR3^+$, $B220^+/CD22^+$, $B220^+/CD45^+$, and $B220^+/lgE^+$ cells in BALF comparing to control group. Eotaxin, IL-5, TNF-${\alpha}$, and Anti-OVA-lgE level in BALF were significantly decreased by SJT treatment too. Histopathological finding verified the improvement of infiltration of inflammatory cells and collagen tissue in the SJT groups comparing to control group. These results strongly suggest that SJT would be a effective candidate for herbal-originated anti-asthmatic drug. However, this drug should be further studied for characterization of the accurate action and underlying mechanisms using variant disease model in the future.

• 한국컴퓨터정보학회논문지
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• 제19권1호
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• pp.149-156
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• 2014

중첩형 일반화 사례 (NGE, Nested Generalized Exemplar) 기법은 거리 기반 분류를 최적 일치 규칙으로 사용하며, 노이즈에 대한 내구력을 증가시켜 주는 동시에 모델 크기를 감소시키는 장점이 있다. NGE 학습 중 생성된 교차(cross)나 중첩(overlap) 현상은 분류성능을 저해하는 요인으로 작용한다. 따라서 본 논문은 NGE 학습 중 생성된 교차나 중첩 현상이 발생한 초월 평면에대해 상호정보가 가장 큰 구간을 분리하여, 새로운 초월평면을 구성하게 하여, 분류성능 향상시키고 초월평면의 개수를 감소시키는 기법인 DHGen(Dominant Hyperrectangle Generation) 알고리즘을 제안하였다. 제안한 DHGen은 분류성능면에서 kNN과 유사하고 NGE이론으로 구현한 EACH보다 우수함을 UCI Machine Learning Repository에서 벤치마크데이터를 발췌한 실험자료로 입증하였다.

• 동의생리병리학회지
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• 제26권4호
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• pp.446-454
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• 2012

In order to evaluate the efficacy of SHT against atopic dermatitis (AD), various immune related cytokines as well as histological comparison were performed in animal models, and the results are described. Clinical skin index of the SHT treated group decreased significantly in weeks 11 and 13, compared to the control group. Also, CD4+ immune cell ratio in the dorsal skin was significantly decreased to 69%, and both epidermal and dermal skin thickness was decreased. Serum IL-4, IL-5, IL-6, IL-13, and TNF-${\alpha}$, which are all important markers of inflammation, were decreased to 64%, 44%, 87%, 48%, and 45%, respectively. The expression of histamine, a chemical transmitter increasingly released during the progression of inflammation, was significantly decreased to 47%. The production of IgE immunoglobulin was significantly decreased to 16% compared to the control group. In conclusion, SHT pacifies the activation of T cells, leading to suppression of both Th2 cytokine overexpression and infiltration of immune cells into skin. As a result, relative thinning of both epidermis and dermis were observed. With the results obtained from in vitro studies, the immune modulatory effect of SHT in AD animal models was experimentally demonstrated. This study should provide solid information to construct EBM and for clinical practice.