除草劑를 利用한 이태리포풀러 苗圃床의 雜草防效果

鄭丞根,金洪殷,李喆求,李明煥 충북대학교 농업과학기술연구소 1989 農業科學硏究 Vol.7 No.2

This experiment was conducted to screen useful herbicides for Populus euramericana Gainer nur-sery at the Chungbuk Forestry Experiment Station in 1988. Soil surface treatment of 11 herbicides was made on May 19 after planting Populus euraneicana G. cuttings. Digitaria sanguinalis(L.) Scopp, Chenopodium album var. centrorubrum Makino, Portulaca oleracea L., Eleusine indica(L.) Gaertner and Echinochloa crusagali (L.) Beauv. var. praticola Ohwi were dominant weeds in the nursery. Among herbicides tested, alachlor G, alachlor+pendimethalin G, Metolachlor+prometryn EC and oxyfluorfen EC were effective to control both grasses and broad-leaf weeds effectively, but the falter two chemicals resulted in severe damage to Populus euramericana. The growth of cuttings measured by basal diameter and height showed no significant difference among treatments and he-rbicides except oxyfluorfen. Significant correlations were observed between weed coverage 2 weeks after herbicide treatment and number of weeds 1 month and 3 months after herbicide treatment. Also, number of weeds after 1 month was significantly correlated with that of 3 months after herbicide treatment.

콩 育成品種과 在來種 나물콩 種實의 形態的 特性

鄭丞根 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2

Morphological characterisitcs of seed sould be considered as one of important criteria for selection of breedeing lines and improvement of varieties for beansprout production is one of major breeding goals in soybean. To provide basic informations which will be useful for breeding program of beansprout varieites, total of 31 soybean varieties and lines were tested in this study. Seed length, width and thickness were in the range of 6.0-9.4mm, 5.6-8.9mm and 4.7-7.4mm, respectively, and 100 grain weights were between 9.5-41.6g. Morphologocal characteristics of indigenouse soybeans for beansprout production were smaller than those of improved varieties. Morphological characteristics of imbibied seed were similar to those of dried seeds but all values were increased. Soybean seeds could be classified based on the length to width ratio(L/W), i. e., L/W for round, normal and flat types were 〈1.1, 1.1-1.2 and〉1.2, respectievely. Seed length was increased most, while seed width and thickness were increased less after imbibition. Seed weights after imbibition was increased 2.0-2.2 times than those of dried seeds. Correlation coefficients among morphological characteristics of dried and imbibied seeds were highly siginificant.

팥의 小葉 및 複葉面積의 簡易測定方法

鄭丞根 충북대학교 농업과학기술연구소 1986 農業科學硏究 Vol.4 No.-

The rapid, nondestructive, and relatively accurate measurement of azuki bean (Vigna angularis (Wild.) Ohwi & Ohashi) leaf area for physiological and agronomic studies is important. The purpose of this study was to develop prediction equations for estimating leaflet and trifoliolate areas of azuki beans. Regression analysis of measurements of leaf length and width of 5 azuki bean collections were compared for the predictive abilities of regression equations and leaf factors, each involving a different independent variable. Prediction equations derived from independent variables involving measurements of length and width were superior at leaflet and trifoliolate levels to those involving measurement of only length or width. However, leaf area could be estimated with little loss of predictive ability by measuring only width for both leaflet and trifoliolate. In a conclusion, terminal leaflet area of azuki beans could be estimated by the following equations : A=0.613LW, A=3.851+7.544LW or A=1.765+0.730W2, side leaflet area : A=0.668LW, A=1.551+0.625LW or A=2.782+0.725 W2, and trifoliolate area : AT=5.532+1.086(∑ LiWi ) or AT=10.726+0.838(∑Wi2).

播種期 및 栽植密度가 단옥수수와 찰옥수수의 이삭形質에 미치는 影響

鄭丞根,許成秀 충북대학교 농업과학기술연구소 1992 農業科學硏究 Vol.10 No.1

This study was conducted to clarify the effects of planting time and planting density on ear characters in sweetcorn and waxycorn and, therefore, to provide informations necessary to improve quality and marketability of sweetcorn and waxycorn ears. Sweetcorn cultivar Goldencrossbantam 70 and a local waxycorn variety were planted on May 6 and June 26 at the planting densities of 4,000,6,50 and 9,000 plants per 10a. Plant and ear height were reduced as planting date was delayed and planting density was increased in both sweetcorn and waxyxorn. In sweetcorn, unhusked and husked ear weights were decreased about 60∼80g as planting was delayed and about 10∼20g as planting density was increased. In waxycorn, both planting date and planting density did not inf1uenced on ear weight. In sweetcorn, unhusked, husked and filled ear lengths wers reduced about 2∼4㎝ as planting date was delayed and about 1㎝ as planting denisty was increased. In waxyxorn, ear length was not affected by planting date or planting density. In both sweetcorn and waxycorn, distribution and variations of ear weight and length were smaller for husked ears than those for unhusked ears. Number of kernel rows per ear was decreased in June 26 planting, but planting density showed no influence in sweetcorn. However, both planting date and planting density did not sow any effect on row number in waxycorn.

안와골절의 외과적 접근에 대한 증례보고

민승기,이은택,오승환,이동근,고세욱,송종민,최성림 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.3

The Orbital fracture which is often combined with midface fracture can cause decreased visual acuity, limitation of eyeball movement, diplopia, enophthalmos, etc. Traumatic orbital fracture causes change of orbital volume, results in diplopia and enophthalmos thus, accurate repositioning of displaced bone and reconstruction of orbital defect with autogenous materials(cranial, rib, iliac bone, cartilage and fascia lata) or alloplastic materials(gelatin film, polyglactin mesh, methylmethacrylate, Teflon, silicone, Supermid, hydroxyapatite and metal). The key point of reconstruction of orbit is accurate repositioning of displaced orbital floor, lateral, medial orbital wall and sufficient bonegraft in anatomical defect. As this cases, we obtained good results through transconjunctival and coronal approach who were required orbital reconstruction. Also, we accurately diagnosed orbital fracture with C.T., 3D model and good result for orbital reconstruction with sufficient parietal block bone graft during average 16.8 months follow-up.

원광대학교병원 응급실에 내원한 치과 응급 환자에 대한 임상적 연구

이동근,민승기,양찬영,문철,김종구 대한악안면성형재건외과학회 2002 Maxillofacial Plastic Reconstructive Surgery Vol.24 No.1

This is a retrospective clinical study on 3,243 patients who had visited the Emergency Room of Wonkwang University Hospital and then been treated in the Department of Oral and Maxillofacial Surgery during recent 5 years from Jan. 1, 1996 to Dec. 31, 2000. The obtained results were as follows : The total number of patients was 3,243 and the ratio of sex was 1.86:1. The highest monthly incidence was shown in October and March to 19%, and the age distribution peaks was the 3rd decade(24.7%), followed by the 1st(21.7%) and the 4th decade(15.7%). The percentage of admission were 4.8%. The frequent cause of admission were facial bone fracture(70%), infection(16%), soft tissue injury(14%). Trauma(70.9%) was the most frequent cause in dental emergency patients, odontogenic infection(24.3%), oral hemorrhage and TMJ dislocation were next in order of frequency. About the cause for trauma, traffic accident was the most, and fall down, slip down injury and assault were followed. Soft tissue injury group(56%) was the most prevalent, followed by tooth injury group(27%) and facial bone injury group(17%). In facial bone injury group, the mandibular fracture(55%) showed the highest incidence followed by zygomaticomaxillary complex fracture, nasal bone fracture, maxilla fracture, and zygomatic arch fracture. In the mandibular fracture, symphysis(40%) was the most common location followed by condyle(29.4%), angle(22.1%), and body area(8.5%). Tooth fracture showed the highest incidence as 35% followed by subluxation(29%), avulsion(20%), and concussion(16%). In infection patients group, the ratio of admission was 5.8% and the major visiting cause was acute pulpitis(32.3%). The major treatment method was the incision and drainage(30%) followed by endodontic treatment(28%), curettage(22%), extraction(7.8%), and so forth. In TMJ dislocation group, the highest incidence age was 3rd decade and 4th decade(51%). In post-operative bleeding group, the major cause of bleeding was non-fulfillment of doctor's instruction and bleeding was almost stoped by only gauze biting.

중국의 '서부대개발'과 자동차 산업 : 한국에의 시사

이승훈,김광억,이근,은종학 서울대학교 사회과학연구원 2001 한국사회과학 Vol.23 No.2

본고는 중국의 서부대개발 정책의 내용과 향후 전망 및 이 정책이 가지는 중국 자동차 산업에의 시사를 찾고자 하였다. 중국 서부지역의 주민들의 의식이나 인프라 등은 동부 대도시의 80년대 말 상황과 비슷할 정도로 뒤떨어져 있다. 서부대개발이 중국정부의 장기적인 프로젝트인 만큼, 우리도 중국 서부를 장기적으로 인식해 적절한 전략적 접근이 필요하다. 한국의 자동차 산업과 기업이 얻을 수 있는 시사점은, 장기적 비전과 전략적 접근의 필요성 외에 다음과 같은 것들이 있다. 첫째, 같은 서부지역이라도 소득수준과 교통 인프라 차원에서 우수한 몇몇 省·市(중경, 사천, 섬서 등)가 서부지역의 발전을 주도할 것이기 때문에 이들 지역을 통한 단계적 진입 전략이 필요하다. 둘째, 서부대개발에 따른 자동차 수요증가는 차종에 따라 달리 나타날 것이므로 이에 대한 고려가 필요하다. 즉, 화물차에 대한 수요증가는 직접적으로 나타날 것이나, 일반승용차에 대한 수요증가는 간접적이고 또한 그 정도도 제한적일 것이다. 셋째, 중국의 자동차 시장은 지역분할 구도의 약화, 시장경쟁의 격화, 유통구조의 개편, 개인구매의 증가 등의 변화를 겪고 있어, 이 같은 자동차 시장 자체의 역동성에 적절히 대응해야 한다 This paper first discusses the main contents and prospect of the Great West Development project of China and then tries to find implications of this project for automobile makers. First we note that this project spans a very long time horizon and thus the firms should approach this with a long term oriented view, rather than expecting any short term benefits. Also, because the projects, especially during the early stage, will be led by selective fore-running regions, like Chungqing, Sichuan and Shaanxi, the firms should take a differentiated and gradual approach. Expansion of demand for automobiles will be different depending upon the kinds of cars. Initial expansion will be more for trucks whereas demand for passenger cars will be indirect or limited. At the moment, the automobile industry in China is undergoing radical changes in terms of regional distribution of market power among the major makers, ever-increasing market competition, changes in the marketing networks, and increasing participation of individual customers. This kind of industrial dynamism should be fully considered in designing corporate strategy or public policy.

니켈기 초내열합금의 고온부식거동에 관한 연구

최승주,이재현,이찬규,김근수,이종훈 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

Hot corrosion behavior of the CMSX-2, CMSX-4, Rene 77, Rene 80 Ni-base superalloys was investigated at 900℃ by two different corrosion methods, immersing the samples in Na2SO4-NaCl mixture(immersion test)and coating the salt mixture on the surface of the samples(modified coating test). The effects of corrosion times and salt compositions from 0 to 100 percent in Na2SO4-NaCl mixtures were examined. Experimental results showed that the corrosion depths in the alloys increased with increasing time, and the depths of the modified coating test were shotter than those of the immersion test in the mixed salt. It was found that the depths of CMSX series alloys increasing NaCl contents in the mixtures up to 50% NaCl. Corrosion products of the alloys were composed of Cr, Al, Ti oxides. The oxide scale, such as Cr₂O₃, Al₂O₃, TiO₂, were shown to improve hot corrosion resistance in the fused Na₂SO₄-NaCl mixtures.

차체 구조의 빔모델링에 관한 연구

최종근,이승훈,최석환 도립 강원전문대학 1998 道立 江原專門大學 論文集 Vol.1 No.1

This paper has been studied to analyze an automotive body structure by means of a simplified beam model rather than a detailed shell model. It has been done to enhance analysis performance to facilitate design changes. Basically automotive body consists of box channel structures and the strain energy for deformation is concentrated in the vicinity of joint area. Therefore analysis errors from beam modeling are due to the difference in strain energy of joint area between beam and shell modeling. Technique using modified section properties has been introduced, and some important nondimensional factors have been also introduced. We have found out the ratio of thickness and section length, t/H is the main factor to decide whether we have to use this new technique in beam modeling of box channel structures with joint. This technique shows the same results from shell modeling within 2 % error, both in static and normal mode analysis for an isolated model.

찰옥수수 이삭 形質의 變異와 雜種强勢

朴鐘元,鄭丞根,朴勝義 충북대학교 농업과학기술연구소 1991 農業科學硏究 Vol.9 No.2

This study was conducted to examine the variations and heterosis of ear characters in waxy corn(Zea mays L.). Total of 13 inbreds and 24 hybrids were tested at the Crop Experiment Station in 1991. The average number of days to tasselling of inbreds and hybrids were 67 and 78 days after planting, respectively, while the everage number of days to silking were later about 10 days than those to tasselling date for both inbreds and hybrids. Silking of both indeds and hybrids was occurred about 3 days after tasselling in general. Growth of hybrids was more vigorous than inbreds for all plant characters, e. i., stem height was 55cm taller and ear height was 35cm higher. KW2 and KW5 were early and short inbreds, while M401WX, W8013 and W8113 were late and tall inbreds. Coefficients of variation of the characters studied were 8-29% for hybrids and those for inbreds were 9-35%. Coefficients of variation of unhusked ear length and ear diameter were small with the range of 8-10%, those of ear weight, unmber of kernels per row and filled ear length were large with the range of 19-35%, and those of filled ear length and row number ranged 11-16%. Hybrids were classified into 6 groups(I- VI) based on ear length and weight. Among 24 hybrids tested, KW1/KW4, KW1/KW2/KW3, KW3/W8013, KW3/W8113 and W8113/KW4 were classified as grade I. Correlations among husked ear length, filled ear length and number of kernels per row were highly significant in both inbreds and hybrids. Ear weight showed the greatest heterosis with 113% in average among 24 hybrids, and number of kernels per row (73%), filled ear length(42%) and husked ear length(24%) followed in that order.