• Journal for History of Mathematics
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• v.25 no.4
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• pp.37-51
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• 2012

By comparing the development history of rectangular coordinate system in Cartography and Mathematics, we assert in this manuscript that the rectangular coordinate system is not so much related to analytic geometry but comes from the space perceiving ability inherent in human beings. We arrived at this conclusion by the followings: First, although the Cartography have much influenced to various area of Mathematics such as trigonometry, logarithm, Geometry, Calculus, Statistics, and so on, which were developed or progressed around the advent of analytic geometry, the mathematical coordinate system itself had not been completely developed in using the origin or negative axis until 100 years and more had passed since Descartes' publication. Second, almost mathematicians who contributed to the invention of rectangular coordinate system had not focused their studying on rectangular coordinate system instead they used it freely on solving mathematical problem.

• Journal of The Korean Society of Agricultural Engineers
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• v.63 no.6
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• pp.39-47
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• 2021

Reduction effect of the spread of odorant and fine dust through windbreak trees can be predicted through numerical analysis. However, there is a disadvantage that a large space and destructive experiments must be carried out each time to calculate the aerodynamic coefficient of the tree. In order to overcome these shortcomings, In this study, we aimed to estimate the aerodynamic coefficient (C₀, C₁, C₂) by using image processing. Thuja occidentalis, which can be used as windbreak were used as the material. The leaf area index was estimated from the leaf area ratio using image processing with leaf weight, and the optical porosity was calculated through image processing of photos taken from the side while removing the leaves step-by-step. Correlation analysis was conducted with the aerodynamic coefficient of Thuja occidentalis calculated from the wind tunnel test and leaf area index and optical porosity calculated from the image analysis. The aerodynamic coefficient showed positive and negative correlations with the leaf area index and optical porosity, respectively. The results showed that the possibility of estimating the aerodynamic coefficient using image processing.

• Journal of Animal Science and Technology
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• v.46 no.3
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• pp.427-436
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• 2004

The current study was conducted to determine the effect of suspension method on satisfaction level of Korean consumers and objective meat quality traits in Hanwoo longissimus dorsi(LD), triceps brachii(TB) and semimembranosus(SM) muscles. Eighteen Hanwoo steers were slaughtered and alternative sides were hung either by pelvic bone(TS) or Achilles tendon(Al). Sensory characteristics, WB-shear force, sarcomere length, water-holding capacity, saroomere length and cooking loss were determined after a 7-d chiller ageing. Higher carcass quality grade received significantly(p < 0.05) greater eating quality for LD, but the grade did not affect eating quality for both TB and SM. TS did not influence objective and subjective meat quality for TB, but that significantly(P < 0.05) improved eating quality for LD and SM. The most noticeable result was that when SM was tenderstretehed, eating quality was equivalent to that of nonna1ly hung LD. In relationship between objective and subjective meat quality assessments, eating qualty for LD had a significant(P < 0.05) relationship with intramuscular fat content, while that for SM was greatly(P < 0.05) related to saroomere length. The current study indicated that pelvic hanging was an effective way to improve eating quality both LD and SM, and carcass quality grades did not greatly reflect eating quality of SM and TB. The data also implied that instnunental measurements poorly estimated the satisfaction level of Korean conswners.

• Korean Journal of Plant Resources
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• v.25 no.2
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• pp.232-239
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• 2012

A laboratory experiment was conducted to determine the content of phenolics and flavonoids, antioxidant activity and cytotoxicity from methanol extracts of different plant parts of $T.$ $officinale$ F. H. Wigg. Total phenolics [mg chlorogenic acid equivalents (FAE) $kg^{-1}$ DW] was highest in flower extracts (72.0 mg $kg^{-1}$), followed by leaf, root, and stalk extracts of $T.$ $officinale$ ($p$ < 0.05). The result of total flavonoid level [mg naringin equivalents $kg^{-1}$ DW] had same tendency to differential total phenolics contents among plant parts, but showed lower ranges of amount. The antioxidant activity of the methanol extracts from all the plant parts dose-dependently increased. DPPH (1,1-diphenyl-2-picryl hydrazyl radical) free radical scavenging activity was highest in flower extracts ($IC_{50}$ value = 624.3 mg $kg^{-1}$ ), and followed by leaf, root, and stalk extracts of $T.$ $officinale$ ($p$ < 0.05). By means of MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay, cell viability of Calu-6 for human pulmonary carcinoma and SNU-601 for human gastric carcinoma showed the lowest $IC_{50}$ value in the flower extracts ($IC_{50}$ value = 85.7 and 311.4 mg $kg^{-1}$, respectively), indicating the highest cytotoxicity. The results suggested that total phenolics content and total flavonoids level in different plant parts of $T.$ $officinale$ were highly correlated with antioxidative ($r^2$=0.7280 to 0.9971) or with cytotoxic activities ($r^2$=0.5795 to 0.9515).

• Weed & Turfgrass Science
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• v.3 no.4
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• pp.284-291
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• 2014

We surveyed the distribution of exotic weeds in the 350 upland crop fields of Gyeonggi-do. The exotic weeds were summarized as 78 taxa including 19 families, 52 genera, 74 species and 4 varieties. Among the total exotic weeds, the summer annuals were 48.7%, the winter annuals 28.2%, and the perennials 23.1%. Compositae was dominant family (32%), followed by Gramineae (8%), Polygonaceae (8%) and Malvaceae (7%). Dominant exotic weeds in northern Gyeonggi-do were Amaranthus lividus, Ambrosia trifida, Chenopodium album, Bidens frondosa and Erigeron Canadensis, and in southern Gyeonggi-do were Chenopodium album, Erigeron Canadensis, Erigeron annuus, Taraxacum officinale and Galinsoga ciliate. The most dominant exotic weeds in the Gyeonggi-do were Chenopodium album, followed by Amaranthus blitum, Erigeron canadensis. Canonical correspondence analysis for investigation of correlation between exotic weeds occurred in northern and southern Gyeonggi-do showed that the exotic weeds in northern Gyeonggi-do were more diverse then in southern Gyeonggi-do. This information could be useful for establishment of exotic weed control methods in Gyeonggi-do.

• Proceedings of the Korean Quaternary Association Conference
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• 2004.06a
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• pp.46-46
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• 2004

Van Mijenfjorden은 스발바드 군도의 Spitsbergen 서부에 위치하는 두 번째로 큰 피오르드로 온난하고 염분도가 높은 북대서양의 표층수가 북극해로 유입되는 Gateway에 위치하기 때문에 전지구적이며 지역적인 기후변화의 영향을 받는 지역이다. 1999년 IMAGES 프로그램의 일환으로 프랑스 탐사선인 'R/V Marion Dufresne'을 이용하여 북극해의 스발바드 군도에 위치하는 Van Mijenfjorden (77$^{\circ}$ 46.87'N and 15$^{\circ}$ 17.81'E)에서 약 18m의 빙ㆍ해양 퇴적물 코아(MD99-2305)를 시추하여 마지막 최대 빙하기 이후의 고환경변화를 연구하였다. AMS 14C 연대 측정에 의하면 diamicton 층인 하부 2m를 제외한 16m의 퇴적층은 지난 12cal. ka BP경에 피오르드에 존재하던 조수빙하(tidewater glacier)가 해빙되기 시작한 이후에 퇴적되었다. 특히 유기지화학 자료와 부유성과 저서성 유공충의 산출양상 그리고 저서성 유공충인 C. reniforme의 산소ㆍ탄소 안정동위원소 비에 의하면 코아 MD99-2305에는 Van Mijenfjorden에서 홀로세 동안에 일어난 퇴적환경변화를 잘 기록하고 있다. 특히 홀로세 동안에 피오르드내의 퇴적환경 변화는 조수빙하의 확장과 후퇴와 밀접한 관계가 있으며, 유기물의 탄소동위원소(13Corg) 비는 -24에서 -22$\textperthousand$ 값의 변화를 보인다. 이는 Van Mijenfjorden 퇴적물에 공급된 유기물은 육상과 해양기원이 혼합되어 퇴적되었음을 지시한다. 지난 12 cal. ka BP 이후 13Corg 값이 뚜렷하게 변하는 것은 Van Mijenfiorden에서 조수빙하의 변동과 표층수에서의 생산력의 변화를 강하게 반영한다. 강하게 반영한다.53%가 이공계 출신, 100대 기업 CEO의 38.4%가 이공계 출신, 대입수능시험에서 자연계 지원비율이 감소 -40.1%('99)\$\longrightarrow$34.7%('00)\$\longrightarrow$29.4%('01)\$\longrightarrow$26.9%('02)\$\longrightarrow$30.3%('03)\$\longrightarrow$31.5%\$\longrightarrow$'04)필요성, 효과적인 운전자 교육 정책 등이 그것이다. 자동차 긴급 피난 차선은 유용한 시설로 여러곳에서 그 기능이 발휘되고 있으므로 많은 고속도로 관계자들은 설계, 시공 및 유지 관리 측면에서 유의해야 할 것이다.미세조직을 광학현미경으로 압출방향에 평행한 방향과 수직방향으로 관찰하였고, 열간 압출재 이방성을 검토하기 위하여 X선 회절분석을 실실하여 결정방위를 확인하였다. 전기 비저항 및 Seebeck 계수 측정을 위하여 각각 2$\times$2$\times$10$mm^3$ 그리고 5$\times$5$\times$10TEX>$mm^3$ 크기의 시편을 준비하였다.준비하였다.전류를 구성하는 주요 입자의 에너지 영역(75~l13keV)에서 가장 높은(0.80) 상관계수를 기록했다. 넷째, 회복기 중에 일어나는 입자들의 유입은 자기폭풍의 지속시간을 연장시키는 경향을 보이며 큰 자기폭풍일수록 현저했다. 주상에서 관측된 이러한 특성은 서브스톰 확장기 활동이 자기폭풍의 발달과 밀접한 관계가 있음을 시사한다.se that were all low in two aspects, named "the Nonsignificant group". And the issues were

• Journal of Conservation Science
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• v.32 no.3
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• pp.425-436
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• 2016

The Yakhyeon catholic church (Historic Site No. 252 in Korea) that was constructed in 1892 has been the first western brick structure to ever have existed and one of the most important historical materials in the Korean modern architecture. After a fire had broken out at the catholic church in 1998, the stained glass on the back wall, the slab glass (dalle de verre) introduced by Lee Nam Guy in 1974, was repaired in 1999 because of singe scorch and water leakage. An analysis of the coloration elements showed that yellow, red and green included Zn, K and Cd, respectively. The glass of red contained Se, dark green contained Mn and Cr, and blue contained Pb and S. According to material analysis, the masonry joint was identified dolomite ($CaMg(CO_3)_2$) and calcite ($CaCO_3$), which was observed plate, columnar, rhombic and square of crystalline particles. Meanwhile, ultrasonic velocity in the stained glass recorded low speed in the middle and lower right of the window (an average of 4,130 m/s). And the joint was measured the lowest physical properties of the top left and middle of the window (an average of 2,053 m/s). This study have showed that extensive physical damage was founded to the left and middle rather than the right side. In this respect, more research in needed to conserve the correlation between color and physical properties.

• Journal of Food Hygiene and Safety
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• v.32 no.3
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• pp.228-233
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• 2017

The aim of the current study was to examine genotoxicological safety of purified bee venom (Apis mellifera L.) The bacterial reverse mutation in Salmonella typhimurium (TA100, TA1535, TA98, and TA1537) and Escherichia coli (WP2 uvrA) were evaluated with purified bee venom at concentrations of 0, 1.5, 5, 15, 50, 150, and $500{\mu}g/plate$. Purified bee venom was negative in Ames test with both in the presence and absence of rat liver microsomal enzyme. According to these results, we concluded that purified bee venom did not cause bacterial reverse mutation. The safety of the purified bee venom at practical doses needs to be further evaluated in in vivo genotoxicity assays.

• Journal of Korea Multimedia Society
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• v.15 no.9
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• pp.1156-1164
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• 2012

Hanok is a cultural heritage containing our ancestor's life style intact and breathing alive with us until now. As Hanok has been concerned as a echo-friendly architecture, a new methodology for efficient construction without damaging the traditional construction process comes into request. The goal of this research is development of a architectural design tool based on the BIM(Building Information Modeling) for satisfying these demands. It will be usable to support whole process of the traditional building from digital design to production and construction. Firstly, we take a consideration of the traditional architecture reflecting the spirit of the age and suggest efficient design method for architectural components. Each components is pre-fabricated as a template representing similar components. All pre-fabricated components are designed by object-oriented concepts so, many variations for a component can be derived from the pre-fabricated component. Our method is helpful for reducing design errors because that it considers combining rule between connecting components in the template design. Moreover it is plugged in the commercial architectural CAD, so it can supports digital design not only traditional architecture but also fusion style mixed with modern architecture.

• Journal of Korean Medical classics
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• v.19 no.1 s.32
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• pp.47-109
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• 2006

서양의학상인위남녀근근시재생식기부동적인(西洋醫學上認爲男女僅僅是在生殖器不同的人). 최근(最近), Legato, Marianne J.박사창립료(博士創立了)‘성인지의학(性認知醫學)’학(學), 개시인식도남녀적차이(開始認識到男女的差異), 주장남녀재치료방법상역부동법(主張男女在治療方法上亦不同法), 종이저일연구진입도료신적단계(從而這一硏究進入到了新的段階). 단시한의학종(但是韓醫學從)${\ulcorner}$황제내경(黃帝內經)${\lrcorner}$개시(開始), 취인위남녀재구조상유근본적차이(就認爲男女在構造上有根本的差異), 이차재생리(而且在生理), 병리(病理), 진단(診斷), 치료상야부동(治療上也不同). 기록한의학기본원리적주역적상관서적화(記錄韓醫學基本原理的周易的相關書籍和)${\ulcorner}$황제내경(黃帝內經)${\lrcorner}$, 이급역대적주요한의서적급종사임상적한의사적서적상(以及歷代的主要韓醫書籍及從事臨床的韓醫師的書籍上), 역도인위남녀유차이(亦都認爲男女有差異). 관어남녀적생성(關於男女的生成), 재(在)${\ulcorner}$보제방(普濟方) 방맥총론(方脈總論)${\lrcorner}$적변남녀형생신육론중제출료(的辨男女形生神毓論中提出了男女的形成有異). ${\ulcorner}$동의보감(東醫寶鑑)${\lrcorner}$여기타한의서부동(與其他韓醫書不同), 불시이질병위주(不是以疾病爲主), 이시이신위중심(而是以身爲中心), 즉목차안형상진행료배열(卽目次按形象進行了排列), 차상세지언급료남녀(且詳細地言及了男女). 나요남녀시고정불변적마 불시적(不是的). ${\ulcorner}$동의보감(東醫寶鑑) 신형장부론(身形臟腑論)${\lrcorner}$인위(認爲)‘인적형색유차이(人的形色有差異), 장부이유이(臟腑易有異), 고외증수동(故外症雖同), 치법인인이이(治法因人而異).’ 안형상선용부동적치법적관점(按形象選用不同的治法的觀点), 이통과주단계지언이표명(已通過朱丹溪之言而表明). 불변관점상여자체격소이동(不變觀点上女子體格小易動), 남자체격대이와(男子體格大易臥). 남자속양기이산(男子屬陽氣易散). 여남자정서초차(如男子情緖稍差), 즉음주해수(卽飮酒解愁), 불이득우울증(不易得憂鬱症). 응보기정기(應補其精氣). 여자속음기이울체(女子屬陰氣易鬱滯), 다유인기지성질(多有忍氣之性質), 이득우울증(易得憂鬱症), 고다용산기약(故多用散氣藥). 간단이언(簡單而言)‘남자위병허증(男子爲病虛證), 여자위병실증(女子爲病實證).’ 종변화적관점래용약(從變化的觀点來用藥), 예여남자수소가용여자약적사물탕(例如男子瘦小可用女子藥的四物湯). 여자비가용남자약적사군자탕(女子肥可用男子藥的四君子湯). 여자골장가용남자약적육미지황환(女子骨壯可用男子藥的六味地黃丸). 위료갱용역이해(爲了更容易理解)‘남녀불변화변화적관점재의학적운용(男女不變和變化的觀点在醫學的運用)’, 이임상병례진행설명(以臨床病例進行說明). 재임상상통과형색맥증적합일화변증론치결정처방(在臨床上通過形色脈證的合一和辨證論治決定處方). 즉불능단순적인위(卽不能單純的認爲), 인위시남자취용육미지황환(因爲是男子就用六味地黃丸), 여자취용사물탕(女子就用四物湯). 남자약소가용사군자탕(男子若小可用四君子湯) 사물탕(四物湯) 육미지황탕(六味地黃湯), 이여자약대가용사군자탕(而女子若大可用四君子湯) 이진탕(二陳湯) 평위산(平胃散) 육군자탕(六君子湯). 인차(因此) 남녀재구조(男女在構造) 생리(生理) 병리유근본성차이(病理有根本性差異), 불이형상래구분(不以形象來區分), 용약상시지불변적입장(用藥上是持不變的立場), 이이형상용약(而以形象用藥), 시종변화적입장래고려적(是從變化的立場來考慮的). 인위이남녀위기준종사임상(認爲以男女爲基準從事臨床), 시부합한의학기본원리지음양관(是符合韓醫學基本原理之陰陽觀).