Heterodyne 刊涉計의 信號處理

김보관 金烏工科大學校 1981 論文集 Vol.2 No.-

Various constraints and conditions for signal processing in heterodyne interferometers are studied. And a real system is described, which was designed and fabricated. Resolution is below 0.4㎛ in distance measurement, with the He-Ne Zeeman Laser. Microprocessor not only simplifies overall system but also provides useful features such s software smoothing or filtering.

水晶 共振子의 새로운 設計法

김보관 金烏工科大學校 1981 論文集 Vol.2 No.-

A new method for the design of physical dimensions of single quartz resonators is derived. In addition to the previous conditions such as resonance equation, inductance condition, and single mode trapping condition, the high-Q condition is taken into consideration in the new method. Design procedure is straightforward from the specifications to the final values, and its practicality is proved by the experiments.

케쥬얼웨어 소비자의 라이프스타일 유형별 구매행동 특성에 관한 연구

김성환,김봉관,윤보석 東亞大學校 經營問題硏究所 1992 經營論叢 Vol.13 No.-

대칭형 스위칭 함수의 2단계 논리 최소화

박준성,김보관 忠南大學校 産業技術硏究所 1992 산업기술연구논문집 Vol.7 No.1

본 논문에서는 대칭형 스위칭 함수에 대한 2단계 최소화 표현식의 크기를 이론적으로 증명하였으며, 새로운 논리 최소화 알고리즘을 제안하였다. 제안된 알고리즘은, 모든 주적항(Prime Implicants)의 생성과 필요 주적항의 선택 또는 적항의 확대 ·축소 ·선택과정의 반복에 의존하는 기존의 최소화 방법과는 달리, 검출된 대칭성으로 부터 최소화 표현식을 반복계산없이 직접 생성하므로 기억용량과 계산시간 면에서 매우 효율적이다. This paper presents a rigorous proof on the size of absolute minimum covers of symmetric switching functions, and proposes a new logic minmization algorithm for such functions. The algorithm is very efficient in terms of storage space and execution of times because it, unlike other algorithms that depend on generation all prime implicants followed by selestion of necessary ones such as essential prime implicants or on iteration of Expand-Irredundant-Cover-Reduce operations, directiy generates an absolute minimum cover once symmetry is detected.

The hyaluronan synthesis inhibitor 7-hydroxy-4-methylcoumarin inhibits LPS-induced inflammatory response in RAW 264.7 macrophage cells

( Gwan Bo Kim ),( Chang-gu Hyun ) 한국응용생명화학회 2021 Journal of Applied Biological Chemistry (J. Appl. Vol.64 No.3

7-Hydroxy-4-methylcoumarin (7H-4MC) inhibits hyaluronan production in multiple cell lines and tissue types both in vitro and in vivo. It is a commercially available drug approved for human use, called hymecromone, in European and Asian countries to prevent biliary spasms. Nevertheless, as the pharmacological efficacy of 7H-4MC has not yet been reported in macrophages, this study investigated its anti-inflammatory effects and mechanism of action using lipopolysaccharide (LPS)-induced RAW 264.7 macrophages. LPS-induced RAW 264.7 cells were treated with various concentrations of 7H-4MC (62.5, 125, 250, and 500 μM). The application of 7H-4MC significantly reduced nitric oxide and prostaglandin E2 production without cytotoxic effects. Additionally, 7H-4MC strongly decreased the expression of inducible nitric oxide synthase and cyclooxygenase. Furthermore, 7H-4MC reduced the production of proinflammatory cytokines, such as tumor necrosis factor-α, interleukin (IL)-1β, and IL-6. Finally, 7H-4MC exerted its potent anti-inflammatory actions via the upregulation of IκB-α production, which led to the inhibition of nuclear factor-κB (NF-κB) activity. These results, obtained in macrophage cell lines, suggest that 7H-4MC prevents inflammatory diseases via the NF-κB signaling pathway and that its use could be beneficial for human health. Ultimately, this is the first report describing the anti-inflammatory activity of 7H-4MC in a macrophage cell line.

Establishment of SPIPO turion bioassay as in vivo HTS for a highly efficient screening of new herbicidal compounds

Bo Gwan Kim,Jin-Seog Kim 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10

Virus Incidence of Sweet Potato in Korea from 2011 to 2014

Kim, Jaedeok,Yang, Jung wook,Kwak, Hae-Ryun,Kim, Mi-Kyeong,Seo, Jang-Kyun,Chung, Mi-Nam,Lee, Hyeong-un,Lee, Kyeong-Bo,Nam, Sang Sik,Kim, Chang-Seok,Lee, Gwan-Seok,Kim, Jeong-Soo,Lee, Sukchan,Choi, Hon The Korean Society of Plant Pathology 2017 Plant Pathology Journal Vol.33 No.5

A nationwide survey was performed to investigate the current incidence of viral diseases in Korean sweet potatoes for germplasm and growing fields from 2011 to 2014. A total of 83.8% of the germplasm in Korea was infected with viruses in 2011. Commercial cultivars that were used to supply growing fields were infected at a rate of 62.1% in 2012. Among surveyed viruses, the incidence of five Potyvirus species that infect sweet potato decreased between 2012 and 2013, and then increased again in 2014. Representatively, the incidence of Sweet potato feathery mottle virus (SPFMV) was 87.0% in 2012, 20.7% in 2013 and then increased to 35.3% in 2014. Unlike RNA viruses, DNA viruses were shown to decrease continuously. The incidence of Sweet potato leaf curl virus (SPLCV) was 5.5% in 2003, 59.5% in 2011, and 47.4% in 2012. It then decreased continuously year by year to 33.2% in 2013, and then 25.6% in 2014. While the infection rate of each virus species showed a tendency to decline, the virus infection status was more variable in 2013 and 2014. Nevertheless, the high rate of single infections and mixed infection combinations were more variable than the survey results from 2012. As shown in the results from 2013, the most prevalent virus infection was a single infection at 27.6%, with the highest rate of infection belonging to sweet potato symptomless virus-1 (SPSMV-1) (12.9%). Compared to 2013, infection combinations were more varied in 2014, with a total of 122 kinds of mixed infection.

Establishment of SPIPO turion bioassay as in vivo HTS for a highly efficient screening of new herbicidal compounds

Bo Gwan Kim,Jin-Seog Kim 한국잡초학회 2018 한국잡초학회 별책(학술대회 초록집) Vol.38 No.2

Distribution Characteristics By Species and Comparison of Social Wasps in Two Metropolitan Cities (Busan, Daegu)

Moon-Bo Choi,Gab-Sue Jang,Seul-Ong Kim,Tae-Su Kim,Gwan-Ik Gwon,Jeong-Kyu Kim,Jong-Wook Lee 한국응용곤충학회 2013 한국응용곤충학회 학술대회논문집 Vol.2013 No.04

This study selected 10 species commonly emerging in Busan and Daegu showing distinct green structure distributions, and distribution differences were mapped and analyzed according to city of origin. As for G-IS (Green-Inhabiting Species) of both cities, there were six species, including V. mandarinia, V. ducalis, V. crabro flavofasciata, Vl. koreensis koreensis, Pa. indica, and P. snelleni, which mostly inhabited urban source green and satellite green structures. As for GU-IS (Green & Urban-Inhabiting Species), there were two species, V. simillima simillima and V. analis parallela, which nested at diverse sites and showed greater preference for green structures. On the other hand, U-IPS (Urban-Inhabiting Preference Species) consisted of two species, V. velutina nigrithorax and P. rothneyi koreanus, which nested at almost all sites, including urban and urban green areas, and were found to adapt well to an urban environment based on their far higher rate of urban nesting as compared to GU-IS species. In comparing emergence rates among the four urban GU-IS and U-IPS species in Busan and Daegu, regular distribution was mostly observed within the city of Busan, which is well equipped with a green network, whereas Daegu, which lacks green structure connectivity, showed its greatest distribution of species nearby urban green areas. Also this study shows that in Daegu with longer distance between green, U-IPS emerged up to far site beyond green areas as compared to Busan, which has short distances between green areas.

개구리밥(Spirodela polyrhiza) turion의 발아 및 초기 생육 특성

김보관(Bo Gwan Kim),김진석(Jin-Seog Kim) 한국잡초학회·한국잔디학회 2020 Weed & Turfgrass Science Vol.9 No.2

본 연구에서는 개구리밥(giant duckweed, Spirodela polyrhiza) turion을 제초활성검정 재료로 사용할 목적으로 이의 휴면, 발아 및 초기 생육특성을 조사하였다. Turion 휴면타파에는 저온이 요구되었으며 4℃의 경우 40일 이상의 담수저장을 필요로 하였다. Turion은 건조에 매우 약하여 실내에서 초기생체중의 50% 정도 건조시 50% 내외가 사멸되었다. 암조건에서는 휴면타파된 turion일지라도 전혀 발아되지 않았으며, 암조건(25-35℃)에 2-3일 보관하는 사전처리는 무처리에 비해 명조건에서의 발아속도를 1일 정도 진전시키는 효과가 있었다. 발아용액의 경우 증류수<수돗물<인공배지(1x mDM)에 치상할수록 발아율과 발아속도가 높았다. 개구리밥 turion의 온도별(25-45℃) 발아특성을 조사해 보았을 때, 증류수에 치상할 경우에는 30℃에서, 수돗물 또는 무기염류가 풍부한 배지에서는 35℃에서 발아속도 및 발아율이 가장 좋았다. 그런데 발아 이후 초기 엽상체의 생장에는 무기염류가 풍부한 배지에서 일지라도 30℃에서 가장 양호하였다. 이는 발아최적온도가 35℃였던 것과는 다른 생리반응으로서 개구리밥이 가지는 독특한 발아 및 초기 생육특성으로 여겨진다. 이상의 결과를 바탕으로 SPIPO turion을 생물검정재료로 사용하고자 할 경우, 수확한 turion을 수돗물 또는 배지에 침지하여 4℃에 60일 이상 두어 휴면타파된 것을 저온의 암조건에 보관하면서 사용하되, 30℃ 내외의 온도와 명조건에서 생물검정하는 것이 바람직한 것으로 여겨졌다. In this study, dormancy, germination and initial seedling growth characteristics of giant duckweed (Spirodela polyrhiza L., SPIPO) turions were investigated to use them as a bioassay materials for new herbicidal compounds. Freshwater storage of more than forty days at 4℃ was required to break down the dormancy of SPIPO turions. The turions were highly sensitive to dryness. The dormancy-broken turions did not germinate under the dark condition at all. However, the dark storage treatment of turions at room temp during 2-3 d shortened germination by one day compared to untreated ones. The germination percentage and velocity of SPIPO turions had a tendency to be increased when they were incubated in tab water or 1x mDM medium than in distilled water. The optimum temperature for germination of SPIPO turions was 30℃ in distilled water, but 35℃ in tab water or 1x mDM medium. On the other hand, the initial growth of the generated fronds was favorable at 30℃ in even 1x mDM solution interestingly. Taken together, it is recommended that the turions which had been soaked in tab water or 1x mDM solution during more than 60 d at 4℃ are useful as a materials for herbicidal bioassay and that the bioassay is carried out at around 30℃ and light condition.