연구보문 : 자연과학 ; 황산처리에 의한 불투수성 황근 종자의 발아촉진에 관한 연구

서상흠 ( Sang Heum Seo ),박민우 ( Min Woo Park ),장미하 ( Mi Ha Chang ),장일웅 ( Il Ung Jang ),심상인 ( Sang In Shim ),나영왕 ( Young Wang Na ),김수영 ( Soo Young Kim ),김석현 ( Seok Hyeon Kim ) 한국국제농업개발학회 2012 韓國國際農業開發學會誌 Vol.24 No.3

The reason of poor germination rate of hamabo mallow seed was speculated using TZ test to determine the viability of seed. Seeds showed high viability via TZ test were not germinated well. The quiescent seeds did not imbibed properly due to the hard seed coat and did not show further processes required for germination. Several well-known treatments for seed coat loosening and water uptake into seed were applied and compared for their efficiency. Stratification, hot water treatment, seed coat scarification, wet-cold treatment were revealed as less effective for improving germination although those treatments were common method for breaking dormant seed. Chemical scarification with sulfuric acid, however, effectively increased germinability and promptness index of hamabo mallow seeds. Optimal time for sulfuric acid treatment was 20 min. Seeds treated for 20 min showed improved germination percentage, germination speed, and promptness index of 80%, 13, and 1969 at 30 days after imbibition, respectively, in petri dish experiment. The values were greater than control seeds showed low values (12%, 1, and 183, respectively). The similar tendency was observed in the pot experiment that sulfuric acid treated seed were sown in artificially mixed soil (loamy soil:peatmoss:sand:compost = 5:2:2:1) and placed in greenhouse. Ultrastructure analysis of chemically scarified seed with sulfuric acid for 20 min by scanning electron microscopy did not show any noticeable changes in seed coat hardness and water uptake via hilum. But the only change after sulfuric acid treatment was removal of hilum cap that close the hilum and hider imbibition. Therefore, subsequent experiment was conducted to know the relationship between removal of hilum cap and facilitated imbibition by sulfuric acid treatment and whether the hilum cap removal directly influenced to the opening of micropyle. Water uptake velocity of seed treated for 20 min in concentrated sulfuric acid for was greater than control seed. This result implies that the crucial effect of sulfuric acid treatment is the removal of hilum cap that increase water uptake via micropyle in hamabo mallow.

다양한 냉동 및 해동공정 조합이 표고버섯의 품질에 미치는 영향

심준보 ( Jun Bo Shim ),조연지 ( Yeon Ji Jo ),최미정 ( Mi Jung Choi ),민상기 ( Sang Gi Min ),유선미 ( Seon Mi Yoo ),천지연 ( Ji Yeon Chun ) 한국산업식품공학회 2015 산업 식품공학 Vol.19 No.3

In this study, the potential of various freezing and thawing combinations was investigated for frozen storage of mushroom (Lentinula edodes). Lentinula edodes were sliced (5×5×50 mm) and then blanched in boiling water for 1 min. Samples were frozen by either natural air convection freezing (NCF, -24℃), air-blast freezing (ABF, -45℃), or liquid nitrogen freezing (LNF, -100℃). Frozen Lentinula edodes were thawed to a central temperature of 4℃ using either flowing water thawing (FT, 10℃), microwave thawing (MT, 400 W), sonication thawing (ST, 40 kHz, 10℃), or natural air convection thawing (NT, 20±5℃). In LNF Lentinula edodes, MT showed the most rapid thawing within 2.5 min followed by ST (30 min), FT (37 min), and NT (75 min). Quality attributes were evaluated by thawing loss, texture (hardness), water content, water holding capacity, pH, and color. A combination of LNF and MT induced the lowest thawing loss among tested combinations of each freezing and thawing. Thawing loss of frozen Lentinula edodes by LNF method was the lowest by MT. pH values NT of ABF method were significantly higher than blanched Lentinula edodes. In our study, MT minimized the quality changes of frozen Lentinula edodes when it was combined with ABF or LNF.

전통식고전학파이론체계에 내재된 균형원리 : 의사결정체계에 의한 파라다임 A Study on the Paradigm using Decision Making Process

沈相銑,李在敏 全北大學校 1996 論文集 Vol.41 No.-

In this article, we look into the paradigmatic charateristics of neoclassical economies, especially the principle of equilibrium system in the viewpoint of decision making process by economic man. Benefit-Cost analysis is extensively used for the purpose from the economic man to the market level and reversely. Finally, we can reach a conclusion like that : According to the principle, as an economic man is increasing the quantity of an object, the marginal benefit in the decision should be increased or constant and, the marginal cost should be decreased or constant. But both can't be constant at the same time. This makes us understand that most of "laws" in neoclassical economic theory are not really "laws" but just "principles" or "postulates" for the principle. But the term "law" must play an important role in strengthening the paradigm.

파절선 관찰 도중 발생한 피하기종: 증례보고

김민영,박성호,신유석,김의성 大韓齒科保存學會 2011 Restorative Dentistry & Endodontics Vol.36 No.6

피하기종은 치과치료 시 나타날 수 있는 합병증의 하나로서, 발치, 근관치료, 수복치료 등과 연관되어 발생할 수 있다. 피하 로 유입된 공기는 부종과 염발음을 일으키며 일반적으로는 주변 결합조직에 의해 그 범위가 한정되나 많은 양의 압축공기가 유 입될 경우 근막공간을 통해 중격동, 흉막공간, 심지어 후복막에까지 영향을 미칠 수 있어 생명을 위협하는 합병증으로 발생할 수도 있다. 이번 증례는 파절선을 관찰하던 도중에 피하기종이 발생한 환자에 대한 증례로서 그 원인과 관리, 예방법에 관해 고찰해보고자 한다. The development of subcutaneous emphysema is a well-known complication that has been reported after dental extraction, endodontic treatment, or restorative preparation. Gaseous invasion, leading to swelling, crepitus on palpation, is commonly restricted to the connective tisssues immediately adjacent to the entry site. However, the use of compressed air- and water-cooled turbines may allow large amounts of air and water to be driven through the fascial planes into the mediastinum, pleural space, or even the retroperitoneum. This case report is about the patient who presented with subcutaneous emphysema that occurred after fracture line inspection. Possible cause, treatment, and prevention of emphysema will be discussed.

회귀분석법을 이용한 로타리 공구의 절삭 특성

심승천,장성민,맹민재,정준기 한국공작기계학회 2004 한국공작기계학회 춘계학술대회논문집 Vol.2004 No.-

This paper deals with the study of feasibility of rotary carbide tools in the machining of aluminium alloy. A rotary tool holder was designed and manufactured for this work. Experiments were performed using Taguchi methods and regression analysis to analyse the influence of various factors and their interactions on the cutting characteristics of rotary carbide tools during machining. The cutting force is influenced the most greatly at the inclination angle. The surface roughness is influenced distinctly at depth of cut. It deduced an equation to predict cutting force and surface roughness. Hence, it could be concluded here that the proposed model agrees with the experimental data satisfactorily.

어린이 경제교육에서 우리 전래동화의 활용가능성 연구

심상선,이재민 한국경제교육학회 2002 경제교육연구 Vol.9 No.1

최근 들어 어린이들의 경제교육에 대한 관심이 고조되면서 경제동화의 출간이 많아졌다. 경제동화를 통한 경제교육은 어린이들에게 경제개념을 흥미롭게 전달할 수 있다는 데 의미가 있다. 본 연구는 어린이들에게 적합한 경제교육의 내용을 검토하고, 어린이 경제교육에 우리 전래동화를 이용가능한지 살펴보았다. 경제교육의 방향이 경제이론교육으로 치우쳐서는 안된다. 주류경제학의 기초가 되는 신고전학파의 경제이론은 이론의 도구주의에 입각하고 있고 기본적인 전제가 우리의 전통적 경제가치관과 배치되는 면이 있음을 간과하면 안된다. 어린이 경제교육은 어린이들의 인지능력과 경험을 한계를 고려하여 구체적이고 다양한 각도에서 경제현상을 분석할 수 있는 능력을 길러주는데 초점을 맞추어야만 한다. 특히 건전한 자본주의의 정착을 위해서 우리의 전통적 경제가치관을 현대적으로 해석하고 적용할 수 있는 방법을 모색해야만 한다. 우리 전래동화는 어린이들에게 적합한 경제교육자료로서 활용가치가 높은 것으로 분석되었다. 짧은 이야기는 구체적인 경제현상의 인과성을 쉽게 파악할 수 있도록 구성되어 있다. 경제행위의 묘사를 통해서 경제행위자의 동기를 구체적으로 이해시킬 수 있다. 특히 이론의 획일적 개념정의에서 벗어나 어린이들이 경제현상을 다양한 각도에서 이해할 수 있는 능력을 가르칠 수 있다. 어린이 경제교육방향은 장차 우리나라 경제체제가 가야 할 방향이다. 건전한 자본주의체제를 정착시키기 위하여 신뢰, 협력, 나누기 등 우리의 전통적 경제가치관이 포함된 우리 전래동화를 적극적으로 활용할 방법이 강구되어야 할 것이다. We look into the contents of our traditional tales in the aspect of children's economic education. Children are lack of experiences and capacity of cognition. They will be able to understand economic concepts well with the vivid expressions about the situations of events and characters' motivations in the stories. Especially the tales are short and develop very fast which help children easily grasp the relations between the cause and the result with interest. At a glance, the stories seem depicting the world not apposite to modem economy. But in fact most aspects of the economic cases in the stories turn out to be suit for the education of basic economic concepts. Moreover, the various cases will help children enlarge their views on economic phenomena explained in a narrow view at economic theory. Moral hazard becomes economic key issues in modern economic theory. However economic moral is treated lightly in school. We should lay stress on trust, cooperation and sharing in children's economic education. We conclude our traditional tales to be unique materials we must make use of to succeed our good traditional economic values to our descendant.

人蔘根 腐病發生에 미치는 病原과 線蟲의 關聯性

李敏雄,申鉉成,沈在郁 동국대학교 1985 論文集 Vol.24 No.-

4 roots of 2 year old ginseng were planted in a small pot trateing with fungal pathogens, Fusarium solani, nematodes isolated from the ginseng (Panax ginseng C.A. Meyer) cultured soil and the two mixed inoculum respectively. Rate of infestation and nematodes distributed around the harvested host plant after 40 days was investigated. To obtained results were as follows: Each group was treated with F. solani, nematodes and mixed inoculum showed higher disease index by infestation from 3.3 to 3.8 while control group was healthy showing lower disease index of 1.2. The nematodes identified were 4 genera in control group and F. Solani inoculated group. 11 genera of nematodes including Xiphinema spp were distributed in the nematodes inoculated pot, and their numbers were higher in the population. Especially Radophalus spp, Tylenchulus spp, Meloidogyne spp, Xiphinema spp and Ditylenchus spp were numerous in their population density, but Belonolimus spp and Hemicyciophora spp were lower. Fourteen genera of nematodes were distributed in the mixed inoculation pot than only the nematodes treated group. and also the population was higher in the mixed inoculation group. The more populated genera is number were Ditylenchus spp, Paratylenchus spp, Paratylenchus spp. Hemicycliophora spp, Meloidogyne spp, Helicotylenchus spp and Tylenchorhynchus spp, but Hirschmanniella spp was less in the population density.

실제 증기 건도 예측 모델의 비교

김지민,박주용,이지수,이성우,심재우 한국공업화학회 2003 응용화학 Vol.7 No.1

Three representative models for the reediction of true mass fraction of steam were compared and analyzed to determine most appropriate model that can used to predict the Critical Heat Flux (CHF) for flow of wate in uniformly heated vertical tubes, The models studied were Kroeger & Zuber's [1]. Levy's[2] and Jafri et al.'s[3]. for the comparison. 188 data points from Becker et al.[4] (10 MP a data) were selected as a representative sample from the CHF database that contains a total of 8.912 data points. In case of Kroeger & Zuber vs. Jafri et al., the average error was 0.33% and the root mean square error was 2.47%. In case of Levy vs. Jafri et al., the average and root mean square errors were 1.66%, 2.67% respectively. Jafri et al.'s model can be applied to both uniform and non-uniform heated tubes because it is in a from of rate equation that can easily be used for calculating the true fraction of steam along the length of tube.

난포기 및 황체기에 있어서 돼지 난관 협부 평활근의 neurotransmitter들의 수축효과에 대한 estradiol-17β및 progesterone의 영향

이민기,노규진,심철수,남윤정,김주현,최상용 慶尙大學校 1991 論文集 Vol.30 No.2

The effects of estradiol-17β or progesterone on the contractility of neurotransmitters on pig oviductal isthmic smooth muscle were investigated. The motility of the isolated smooth muscle was recorded by using physiological recording system. The results were summarized as follows : 1. The contractility induced by histamine or prostaglandin F2α was depressed by the pretreatment of estradiol-17β but was not by the preteatment of progesterone in follicular or luteal stage. 2. The contractility induced by acetylcholine was depressed un follicular stage but excited in luteal stage by the pretreatment of estradiol-17β or progesterone. 3. The contractility induced by norepinephrine was depressed by the pretreatment of progesterone in follicular stage but was excited by the pretreatment estradiol-17β in luteal stage.

활성탄의 종류에 따른 P-Chlorophenol의 Kinetic 흡착 특성에 관한 연구

김지민,이성우,이지수,박주용,심재우 한국공업화학회 2003 응용화학 Vol.7 No.1

Adsorption characteristics of P-Chlorophenol on Activated Carbon Fiber (ACF) and Granular Activated Carbon (GAC) were investigated. The influence of initial P-Chlorophenol concentration on rate of adsorption was studied. The adsorption rate of activated carbon fiber was much higher than the granular activated carbon. The kinetic coefficients of adsorption process of P-Chlorophenol on each carbon were determined experimentally and used in the model to predicted the adsorption The adsorption experimentally and used in the model to predicted the adsorption. The adsorption prediction on ACF required a modification of adsorption amount (qm) of Freundlich's equilibrium adsorption to predict accurately in the model used.