Improved Micropropagation of Root Chicory, Cichorium intybus L. var. sativus.

Lim,Jung-Dae,Yang,Deok-Chun,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Sung,Eun-Soo,Yu Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

The establishment of an efficient protocol for plant regeneration and micropropagation from leaf explant cultures of Chicory, Cichorium intybus L. var. sativus. is reported. Callus formation rate appeared 100% from explant in all growth regulators, but calli formed in the prensence of naphthaleneacetic acid (NAA) were appeared very compact and non-embryogenic state. The regenerated shoots were obtained from leaf explant cultures on solid MS medium containing different concentrations of cytokinins and auxin. The highest number of shoots (5.7) per explant and shoot growth (2.8cm) was obtained on MS medium containing 0.1 mg BAP L^-1 and 0.1 mg NAA L^-1. Indole acetic acid was the most suitable auxin for root formation among three auxins tested. 2,4-D had no effect on shoot and root formation.

Effect of Photoperiod, Temperature and True-leaf Stage in Bolting Rate of Chicory (Cichorium intybus L. var. sativus)

Lim,Jung-Dae,Seo,Jeong-Sik,Lee,Hyeon-Yong,Kim,Jong-Dai,Lee,Jin-Ha,Yu,Chang-Yeon 한국자원식물학회 2004 Plant Resources Vol.7 No.1

Root chicory (Cichorium intybus L. var. sativus) is potential alternative medicinal and sugar crop which accumulates a high amount of linear polyfructan, inulin in its roots. A problem in root production is that over-wintered stock plants often flower. Once the plant becomes reproductive, stem elongation and root growth slows and floral buds arise from every node, rendering the plants useless for propagation. The objectives of this research was to examine the effectiveness of manipulating environmental factors containing photoperiod, temperature and number of leaf states. The experiment was performed in growth chamber to create two photoperiods (8 h, and 16 h) with three temperature regimes (5℃/3℃, 10℃/8℃, and 15℃/13℃ day/night temperature) for a total of six treatments on three type of true-leaf stage of plant. Data of bolting rate, shoot and root length, shoot and fresh weight was invetigated in each treatments. This is the first report on changes in bolting rate and shoots and roots production during a whole growing season and differences in the effect of cold and photoperiod treatment depending on the true-leaf stage of plant.

경쟁 위협과 자기자본비용

임승연(Lim, Seung-Yeon),최가영(Choi, Ga-Young) 한국국제회계학회 2021 국제회계연구 Vol.- No.99

[연구목적] 본 연구에서는 기업의 사업보고서의 비계량적 정보에 기반한 경쟁 변수인 기업의 경쟁 위협과 자기자본비용 간의 관계를 분석하고자 한다. 선행연구에 의하면 기업 간 경쟁이 치열해질수록 기업의 이익이 줄어들고 변동성이 높아지기 때문에 부도 위험이 증가할 수 있지만, 또 한편으로는 이러한 경쟁이 외부의 감독(monitoring) 역할을 하게 되어 경영진과 주주간의 대리인 위험을 감소시켜 정보비대칭 위험이 줄어들 수도 있다. 따라서 기업이 직면한 경쟁 정도는 자기자본비용에 영향을 미칠 수 있으므로 이는 실증분석의 대상이 된다. [연구방법] Hoberg et al.(2014)에 의해 개발된 기업 수준의 경쟁 위협 변수(Fluidity)를 이용하여 기업이 직면한 경쟁과 자기자본비용 간의 관계를 살펴본다. 또한, 매출 상위기업이나 이익 상위 기업은 경쟁의 선도자(leaders)로서 해당 기업이 제공하는 정보는 독점정보의 공시비용(proprietary cost)이 클 것으로 예상되므로, 매출(이익)의 상위기업으로서 매출액(혹은 당기순이익) 기준으로 상위 10%와 25%에 속하는 기업에 더미변수를 부여하여 기업의 경쟁 변수와 자기자본비용 간의 관계에 어떻게 영향을 미치는지 분석한다. [연구결과] 본 연구에서는 경쟁 위협이 심해질수록 자기자본비용이 감소하는 결과를 제시한다. 이는 경쟁이 치열해질수록 경영진과 주주간의 대리인 위험을 감소시켜 정보비대칭 위험이 줄어들기 때문이라고 해석할 수 있다. 그러나 이러한 관계는 매출(이익) 측면에서 선도 기업에서는 반대로 나타나고 있다, 즉, 매출(이익)의 상위 기업의 경우 독점정보의 공시비용 때문에 경쟁이 심해질수록 자기자본비용이 증가한다는 결과를 제시한다. [연구의 시사점] 본 연구는 정보위험 관점에서 기업 수준의 경쟁 위협과 자기자본비용 간의 관계를 실증분석한 후, 기업이 경쟁의 선도기업인지 여부에 따라 이들 간의 관계가 다름을 보인 최초의 연구이다. 경쟁에서 기업의 위치에 따라 정보위험 역시 달라진다는 것을 시사하고 있다. [Purpose] This study investigates the relation between the firm-level competition using qualitative information based on financial statements and the implied cost of equity capital. While some studies suggest that intensified competition may lead to distress risk due to a decreased profit or its uncertainty, other studies suggest that competition may play a monitoring role and hence decrease information risk caused by the reduced agency problem between manager and owners. Therefore, competition may be related to the cost of equity capital. [Methodology] As a proxy for firm-level competition, we use Fluidity developed by Hoberg et al.(2014) and examine the relation between a firm’s competition and its cost of equity capital. In addition, we divide firms into industry leaders and industry followers based on sales or profit, and then reexamine the relation between firm-level competition and cost of equity capital for the industry leader companies because the leader companies tend to be reluctant to provide their information due to proprietary costs. [Findings] This study provides evidence of the negative relation between firm-level competition and cost of equity capital, suggesting that information asymmetry decreases as competition intensifies. However, for the leader companies, we find the positive relation between firm-level competition and cost of equity capital due to proprietary costs. [Implications] We shed light on information risk in the relation between the firm-level competition and cost of equity capital. This is the first paper to show that the relation between the firm-level competition and cost of equity capital can be different depending on the firm’s competitive status.

두부손상환자 가족의 불안에 관한 탐색적 연구

임연경,소희영 충남대학교 의과대학 지역사회의학연구소 1989 충남의대잡지 Vol.16 No.1

Economic an Social development have been accompanied by an increased traffic and industrial accident rate resulting in head injuries causing disability to youth; head injury place a burden on their families. The study purpose was to determine factors and levels related to anxiety of head injury patients’ family members with sudden accident. Furthermore it was to contributed to the assessment and the intervention of nursing for the promotion of recovery and adaptation of patient. The Subjects for this study were 150 family members. The samples were head injury patients’ family members in 7 general hospitals in Daejon. Data was collected from July 3rd, to Aug. 19th 1988. The content validity was verified and the reliability about each items was Cronbach’s alpha value. .9550. Data was analyzed in a SPSS program using the frequency, Mean, Standard derviation, t-test and ANOVA. The results were as follows! 1. Among anxiety factors reported by the subjects, that which ranked highest was “having anxiety when the patient’s progress become worse”(M=4.253, SD-1.130). Next was “having anxiety when I see that another patient who has the same operation becomes aggrevated”(M=4.0130, SD=1.117), and “having anxiety when the patient’s character or appearance may be changed after a head injury”(M=3.880, SD=1.146). 2. Level of anxiety about social factor was M=3.46, SD=0.96, emotional factor was M=3.37, SD=0.85 and physical factor was M=3.18, SD=1.08. 3.Among the general characteristics of family members, level of anxiety was statistically significant differences in age (F=4.9418, P<0.001), marital status(F=8.8443, P<0.09), level of education (F=3.0892, P<0.05), Surgery (t=3.3, P<0.001), and level of consciousness (t%3.38, p<0.001). 4. There were statistically significant differences between levels of anxiety of patients’ family members related with the duration of hospitalization (F=2.5401, P<0.05). 5. There were statistically significant differences between anxiety of patients’family members related with the connection. 6. There were statistically significant differences between anxiety of patients’family members related with severity of illness(F=26.9820,F<0.001).

회충란에 의한 간피막의 섬유석회성 결절 1예 보고

서연림,박소영,지제근 대한병리학회 1992 Journal of Pathology and Translational Medicine Vol.26 No.4

사람의 간내담관의 발달에 관한 형태학적 및 면역조직학적 연구

서연림,지제근 대한병리학회 1994 Journal of Pathology and Translational Medicine Vol.28 No.1

하악 유구치 치근단 병소에 의해 변위된 계승 영구치의 맹출유도

양수민,김재곤,백병주,양연미,한지혜 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.2

적절히 치료받지 못한 유치의 치수 감염은 치근단 주위로 확산되고 그 치근단 병소는 계승 영구치의 조기 맹출, 법랑질의 저형성이나 저석회화, 발육정지 등의 합병증을 야기할 수 있다. 특히 유치의 치근단 감염은 계승치의 변위를 야기할 수 있으며, 계승 영구치배의 위치변화는 선행 유치의 치수변성으로 인한 것이 가장 많다. 본 증례보고는 하악 유구치의 치근단 병소에 의해 계승치가 변위된 경우로서, 증례 1은 하악 우측 유구치 하방의 치근단 낭에 의한 계승치의 변위가 관찰되어 유치 발치 및 조대술을 시행한 후 obturator를 장착하였고, 증례 2는 하악 우측 제2유구치 하방의 치근단 농양에 의한 계승치의 변위가 관찰되어 유치를 발거하고 공간유지장치를 장착하였다. 본 증례를 통하여 하악 유구치 치근단 병소에 의해 계승 영구치가 심한 변위을 나타낸 경우, 적절한 치료를 통해 계승 영구치의 적절한 맹출을 유도할 수 있었기에 보고하는 바이다. Primary teeth and the permanent successor must be understood as interdependent units, where each one of them interacts with and depends upon the other. The spread of pulpal inflammation in primary teeth to the periradicular tissues can lead to early eruption, enamel hypoplasia or hypocalcification, developmental arrest of permanent successor. Also the periapical inflammation cause permanent tooth displacement in various direction. We describe here two clinical cases of displaced permanent successor caused by periapical lesion of mandibular primary molar in children.

數學敎育의 現況分析과 改善方案 (Ⅱ) : 中·高校 數學科 運營과 敎師 現況分析 Analysis of administrations and teachers of today's math. department in the middle and high schools

林在圭,奇宇恒,金演哲,金正遠 慶北大學校 師範大學 1981 敎育硏究誌 Vol.23 No.-

Owing to the curriculum's revision of primary and high school in the beginning of 1970, several elementary concepts of modern mathematics were introduced as new teaching contents. So the efficient ways to reeducate the present teachers and to publish a desirable textbook have been badly needed. In this paper, we investigate the present situations of administration and teachers of mathematics department in the city and rural area. On the basis of these results, we find out the better ways of mathematics education from the following points of view: 1. The general administrations of mathematics department. 2. The reeducation and education for mathematics teachers. 3. Mathematics textbooks. 4. Evaluations and tests.

産褥期 感染 誘發 細菌의 生育을 억제하는 韓藥材 探索에 關한 硏究

임재연,성연수,김희진,이태균 동국대학교 한의학연구소 1997 東國韓醫學硏究所論文集 Vol.6 No.1

産褥期 感染이란 分娩後 生殖器의 細菌에 의한 感染을 意味하며, 産後 體溫上昇의 大部分은 骨盤感染에 의한 것으로 産褥期 感染의 重要한 指漂가 된다. 한의학에서 産後發熱의 病因病耭는 주로 邪毒感染, 血瘀, 外感, 血虛 등으로 보았으며, 치료는 一般的으로 産後疾患에는 處證이 많아 發表攻裏를 過度하게 하지 않고, 氣血과 營衛의 調和에 위주로 하나, 外感과 裏實證을 疏怒히 하면 안된다. 따라서 産後發熱을 惹起하는 各種 原因菌에 對한 客觀的인 抑制效果의 檢證은 産後發熱의 治療率을 높이는데 중요하다. 그 결과 산욕기감염을 유발하는 各種 細菌에 對해 黃連, 烏梅, 五味子 등의 水溶性 抽出物이 杭菌活性이 相對的으로 좋은 效果를 보였다. 따라서 産褥期 感染의 治療에 이들 韓藥材를 이용하면 보다 效果的일 것으로 생각된다. Deparment of Oriental Medicine, Graduate School of Dongguk University, Major in Oriental Ob & Gy. Various kinds of medicinal herbs and prescribed herb medicines which have usually been used for treatment of reducing fever, purging intense heat, and detoxication were secreened for antibacterial activity against Proteus vulgaris, S. aureus, and E. faecalis which causing puerperal infection. Minimal inhibitory concentrations of water- and ethanol-soluble extracts of Hwangyon(C. japonica), Omae(P. mume), and Omiza(S. chinensis) were determined and using thin-layer chromatography the extracts of Hwangyon and Omiza were separated. The results obtained were as follows: 1. The water-soluble extracts of Keumeunhwa(L. japonica), Chiza(G. jasminoides), Hwangyon(C. japonica), Dansam(S. miltiorrhiza), Omae(P. mume) and Omiza(S. chinensis) showed antibacterial activities against P. vulgaris ; among them, the extracts of Hwangyon, Omae, and Omiza showed high antibacterial activities. The water-soluble extracts of Keumeunhwa(L. japonica), Hwangyon(C. japonica), Hwangkeum(S. baicalensis), Hwangbaek(P. amurense), Dansam(S. miltiorrhiza), Daehwang(R. coreanum), Omae(P. mume), Omiza(S, chinensis), Gingseng(P. ginseng), and Gamcho(G. uralensis) showed antibacterial activities against S. aureus ; among them, the extracts of Hwangyon and Omiza showed high antibacterial activities. The water-soluble extracts of Banggi(C. trilobus), Daehwang(R. coreanum), Omae(P. mume), Omiza(S. chinensis), and Gamcho(G. uralensis) inhibited the cell growth of E. faecalis ; among them, Omae and 0miza showed high antibacterial activities. The extract of Hwangyon(C. japonica) and Omae(P. mume) showed no inhibition against E. coli. However, the extract of Omiza(S. chinensis) inhibited cell growth of both E. coli and B. subtilis. 2. The water- and ethanol-soluble extract of Hwangyon(C. japonica) showed antibacterial activities against P. vulgaries and S. aureus, those of Omae(P. mume) against P. vulgaris and E. faecalis, and those of Omize(S. chinensis) against all species tested, P. vulgaris, S. aureus, and E. faecalis. With the exception that ethanol-soluble extract of Hwangyon(C. japonica) showed much higher antibacterial activity against S. aureus than water-soluble one, antibacterial activities of both water- and ethanol-soluble ones were similar to each of other two medicinal herbs. 3.When the prescribed herb medicines were tested, Sambohwan showed antibacterial activities against P. vulgaris and S. aureus. No prescribed herb medicine inhibited the cell growth of E. faecalis. 4. Minimal inhibitory concentrations(MICs) of both water- and ethanol-soluble extracts of Hwangyon (C. japonica), Omae(P. mume), and Omiza (S. chinensis) against P. vulgaris were 2.5㎎/㎖, 10㎎/㎖, and 20㎎/㎖, respectively. Those of both Hwangyon (C. japonica) and Omiza(S. chinensis) against S. aureus were 1.25㎎/㎖ and 10㎎/㎖, respectively. MICs of water-soluble extracts of Omae(P. mume) and Omiza(S. chinensis) aganist E. faecalis were 2.5㎎/㎖ and 5㎎/㎖, and those of ethanol-soluble extracts were 5㎎/㎖ and 10㎎/㎖, respectively. Except for those of E. faecalis, the cell growth of P. vulgaris and S. aureus were inhibited by much lower concentration of ethanol-soluble extracts used. As a result, the antibacterial compounds against P. vulgaris, S. aureus, and E. aecalis are contained in the extracts of Hwangyon(C, japonica), 0mae(P. mume), 0miza(S. chinensis), the prescribed herb medicine, Sambohwan, and might be used for treatment of puerperal infection. Further study should be carried out to identify which compounds affect the cell growth inhibition of P. vulgaris, S. aureus, and E. faecalis.

열처리시 냉간가공된 Zircaloy-4합금의 미세조직 및 재결정 거동

林潤洙,崔洋鎭,鄭蓮眺,魏明鏞 大田産業大學校 1999 한밭대학교 논문집 Vol.16 No.1

Effects of heat-treatment on the microstructure and recrystallization behavior of cold-worked Zircaloy-4 were studied. We used 70% cold-rolled, thin strip specimens. Heat-treatment of the specimens were performed at temperatures between 300℃ and 800℃ for 30 to 5,000 minutes. The recrystallization behavior were observed by means of polarized optical microscopy and TEM. Hardness were measurement by Micro-victors hardness tester. As the annealing time increased, the temperature region of hardness drop moved to lower, because the recovery and recrystallization could occur in lower temperature. The recrysatllization of cold-worked Zircaloy-4 alloys was completed between 500℃ and 600℃ for 60 min. The size of recrystallized grain visibly increased at 800℃ for above 600 min. The activation energy(Q) for recrystallization of Zircaloy-4 alloys was determined by the time for constant fraction technique and it was 253KJ/mo1.