송백류의 (松柏類) 분포를 중심으로 하는 한라산의 수직분포대

엄규백 (Kyu Baek Uhm) 한국식물학회 1962 Journal of Plant Biology Vol.5 No.2

UHM. Kyu Back (Dept. of Botany, Coll. of L. & S., Seoul National Univ.) Altitudinal zones of Mt. Hanla according to Coniferae distribution. Kor. Jour. Bot. V(2) : 17-20. 1962. Attitudinal zones of Mt. Hanla were geoecologically investigated, and compared with climatic index, according to Coniferae distribution. For climatic index, Warmth index was calculated on Mt. Hanla. With the reaultsobtained, the altitudinal zones can be classified into the following three zones: Coniferous forest zone; below 43˚(month-degrees) (above 1,450 m) Deciouous broad-leaf forest zone: 84˚-43˚ (600-1,450 m) Lucidophyllous forest zone: above 84 ˚ (below 600 m)

기후적 질서로 본 오대산 선식물상

정영호(Young Ho Chung),엄규백(Kyu Back Uhm) 한국식물학회 1961 Journal of Plant Biology Vol.4 No.2

CHUNG, Yung HO, and Kyu Baek UHM. (Dept. of Botany, Seoul National University.) Moss flora on Mt. Odae in its climatic aspects. Kor. Jour Bot 4(2) 33~40 1961 The moss flora and it`s geoecological study were made on Mt. Odae which is situated in the eastern part(37˚43` N. Lat., 120˚30` E. Long) of Korea. The total number of mosses collected on Mt. Odae in the autumn of 1960 is 50 species, 1 varieties and 1 subspecies, belonging to 23 families. For climate index, Warmth index and Humidity index were calculated on Mt. Odae. From the result, it was known that the c1imate of Mt. Odae is Humid temperate climte and that it`s vegetation zone is Deciduous broad-leaf forest zone. Moss Quotient of this mountain is 1.21 and it indicates that the plant climate of Mt. Odae is Hemicryptophytic climate. The moss flora of this mountain was discussed from the pnytogeographical point of view. The flora consists of the following elements: Holaectic element: 20 species (38.5%) North Pacific element: 1 (1.9%) Cosmopolitan element: 6 (11.6%) Tropical element: 1 (1.9%) East Asiatic element: 12 (23.05%) Korean-Japan element: 12 (23.05%) Coefficient of closeness was also calculated between the moss flora of Mt Odae and that of Mt. Sulak and Mt. Kwanak. It was known, therefore, that the flora relation between Mt. Odae and the Mt. Sulak was closer than that between Mt. Odae and Mt. Kwanak.

Further Results on Piecewise Constant Hazard Functions in Aalen's Additive Risk Model

Uhm, Dai-Ho,Jun, Sung-Hae The Korean Statistical Society 2012 응용통계연구 Vol.25 No.3

The modifications suggested in Uhm et al. (2011) are studied using a partly parametric version of Aalen's additive risk model. A follow-up time period is partitioned into intervals, and hazard functions are estimated as a piecewise constant in each interval. A maximum likelihood estimator by iteratively reweighted least squares and variance estimates are suggested based on the model as well as evaluated by simulations using mean square error and a coverage probability, respectively. In conclusion the modifications are needed when there are a small number of uncensored deaths in an interval to estimate the piecewise constant hazard function.

Problems of Assessing L2 Communicative Performance

Uhm, Chul Joo 대한언어학회 1996 언어학 Vol.4 No.-

Uhm, Chul Joo. 1996. Problems of Assessing L2 Communicative Performance. Linguistics 4, 95-108. Evaluation is an especially problematic aspect of proficiency-oriented language pedagogy. Here, therefore, I briefly review a few important problems at thee levels that seem to cause difficulties in the design, development and use of communicative tests such as: i) lack of theory of communication and of a description of language in use, ii) the loose definition of 'communicative proficiency" and the unclear idea of what to test, and iii) the search of a new way for achieving reliability. In this review we find out that the shift of focus in language teaching from language form to use is an exciting and promising development; however, we need to make endless efforts to develop the possibility of alternative assessment as valid and reliable procedures for this change. (Kwangju University)

Communication Strategies in Interaction between Korean EFL Learners

Uhm, Chul Joo 대한언어학회 1998 언어학 Vol.6 No.1

Uhm, Chul loo. 1998. Communication Strategies in Interaction between Korean BFL Learners. Linguistics, 6-1, 487-502. This case study examines the characteristics of communication strategies(CS) in non-native/non-native interaction. The Korean EFL learners' use of CS in interaction does not differ from that of native/non-native interaction observed previously in terms of holistic strategies and analytic strategies. On the other hand, the absence of linguistic strategies such as literal translation and foreignizing may underscore a distinction between NNS/NNS and NS/NNS interactions. In addition, since the difference between High and Low fluency groups in terms of the number and the kind of CS is observed, the transitional directionalities in interlanguage can be also proved. (Kwangju University)

Investigating the Empirical Aspects of Communication Strategies

Uhm, Chul Joo 대한언어학회 2000 언어학 Vol.8 No.1

Uhm, Chul Joo. 2000. Investigating the Empirical Aspects of Communication Strategies. Linguistics 8-1, 353-377. This critical review on communication strategies (CS) characterizing the second language learners' communication problems will be concerned with some important empirical research that we should find useful when investigating the mechanism for processing that will explain how learners produce the utterances, and why they choose the solutions they do. Included are the summary of various typologies on which these empirical studies are based and the categorized review of the studies from reduction CS, compensatory CS and process approach perspectives. (Chonnam National University)

대수 주기 칸토어 다이폴 안테나의 복사 특성

엄선용(Sun-Yong Uhm),최학근(Sun-Yong Uhm) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.3

본 논문에서는 기존 다이폴 소자 대신에 칸토어(Cantor) 다이폴 소자로 구성된 새로운 타입의 대수 주기 칸토어 다이폴 안테나(LPCDA: Log-Periodic Cantor Dipole Antenna)를 제안하였다. 제안된 안테나는 칸토어 다이폴소자를 사용함으로써 안테나의 소형화를 실현하였다. 제안된 안테나 타당성을 확인하기 위하여 1~4 ㎓의 주파수에서 동작하는 LPCDA를 설계하여 기존의 LPDA(Log-Periodic Dipole Antenna) 특성과 비교하였다. 그 결과, LPCDA는 LPDA보다 소자의 길이가 13.3 % 짧으면서도 상한 주파수 부근에서 이득은 약 2 ㏈ 증가하고, VSWR은 2 이하로 나타났다. In this paper, a novel log-periodic cantor dipole antenna(LPCDA), which is composed of the cantor-dipole elements instead of the existing dipole elements, is proposed. The proposed antenna makes possible the antenna miniaturization by using the cantor-dipole elements. To investigate the reliability of the proposed antenna, LPCDA is designed and analyzed at 1~4 ㎓ band and compared with LPDA(Log-Periodic Dipole Antenna) characteristics. It is shown that although the elements of LPCDA are 13.3 % shorter than LPDA, the gain increases about 2 ㏈ and VSWR is less than 2 in at the upper band.

염해지 우탁토양 (于拓土壤)에서 수도생육 및 수량에 미치는 토양개량제의 효과

엄대익(Dae Ick Uhm),유숙종(Sook Jong Yoo),엄택용(Taik Yong Uhm) 전북대학교 농업과학기술연구소 1989 농업생명과학연구 Vol.20 No.-

Characteristics of Covalent Coupled β-amylase on the Crosslinked Gelatin

Uhm, Tai Boong,Kwon, Young Ju,Kim, Myung Kon 전북대학교 농업과학기술연구소 1984 農大論文集 Vol.15 No.-

Gelatin 誘導體에 β-amylase를 共有的으로 결합하기 위해 새로운 방법이 시도되었다. Gelatin 분자에 glu-taraldehyde를 첨가하여 gelatin 분자의 아미노기들이 glutaraaldehyde와 결합, 가교화되었고 이때 가교화되지 않은 일부 자유 알데히드기가 효소와 共有的으로 Schiff's base를 형성하였다. 표면적을 증가시키기 위해 냉동 건조된 gelatin에 50℃에서 5% 이상의 glutaraldehyde가 처리되었을 때 높은 효소 활성을 나타내었다. 고정화된 효소는 회분식 반응조에서 여러 특성이 조사되었다. 최적 pH는 3.5로서 가용성 호소보다 낮은pH로 이동되었는데 이는 가교화된 gelatin이 음이온의 전하를 띤 중합체임을 보여준다. 온도에 따른 최대활성도는 55℃로서 가용성 효소와 거의 같았으나 활성도는 약간씩 더 높은 온도로 전이되었다. 이때 활성화에너지는 31.6KJ/mole로서 가용성 효소의 28.7KJ/mole보다 높았다. 열에 대한 안전성은 가용성 효소보다 높았으나 큰 차이를 보이지 않았는데 이는 결합된 호소 분자 자체가 gelatin의 높은 열팽창에 의하여 3차원적 구조의 변화를 보인 것으로 생각이 된다. 가교화된 gelatin에 호소 결합은 건조 그람당 약 5㎎ 정도로서 산업적으로 이용할 수 있기 위하여서는 효소결합 비율을 더 높이는 방법이 요구된다. A modified procedure was adopted for preparing gelatin derived polymer. First, glutaraldehyde was treated so as to react with the free amino groups of the gelatin molecules. Next, the enzyme was covalently bound to the free aldehyde moieties of the crosslinked gelatin, forming the Schiff's base. In this method, main enzyme binding mode was covalent bonding between enzyme and gel matrix. The prepared polymer had a good mechanical strength and any solubilization was not detected during the operational process. Kinetic parameters of the immobilized enzyme were determined. Optimum pH of the immobilized enzyme was 3.5, which shifted to lower pH region than of soluble enzyme. Optimum temperature of the immobilized enzyme shifts to somewhat higher temperature than that of the soluble enzyme. Enzyme loading capacity was approximately 5 mg per dry gram of the polymer. For the industrial applications, the polymer should be improved in the enzyme loading capacity.

Purification and Properties of a Cell-bound Inulase from BaciIIus subtilis

Uhm, Tai Boong,Kwon, Young Ju,Yun, Se Eok,Hong, Jai Sik 전북대학교 농업과학기술연구소 1986 農大論文集 Vol.17 No.-

A cell-bound inulase (β-fructofuranoside fructohydrolase, EC 3.2.1. 26) from Bacillus subtilis has been purified to homogeneity through a sequence of lysozyme treatment, acetone fractionation, chromatography on Sephadex G-100, DEAD-Sephadex treatment, HPLC and isoelectric focusing method. The molecular weight of the enzyme was 49,000. The enzyme had a pI point of 5.1. The hydrolysis patter of the substrate by this enzyme ws a exo-cleavage type which showed gradual shift to the lower degree of polymerization of fructan during the enzyme-substrate reaction.