오차드그라스의 예취빈도에 따른 무기태질소의 단기시용 효과

조익환,이용세,전하준 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.2

A study was made to estimate the economic level(Necon.) of mineral nitrogen and a proper cutting frequency for the dry matter production of Orchardgrass (Dactlyis glomerata L.) during the harvested years in 1993∼1995. Annual mineral nitrogen was applied at the levels of 0, 90, 180, 270 and 360 kg ha^(-1) in 3 cuttings, 0, 120, 240. 360 and 480 kg ha^(-1) in 4 cuttings, and 0. 150. 300. 450 and 600 kg ha^(-1) in 5 cuttings, respectively. The dry matter yields of all cutting frequencies in 1993 were significantly higher than in the other harvested years. Mean dry matter yield were 13.1, 12.7 and 14.3 tons ha-1 in 3, 4 and 5 cuttings, respectively. Higher efficiencies of dry matter production in response to mineral nitrogen application were recorded as 12.9 kg at level of 360 kg ha^(-1) yr-1 in 3 cuttings. 27.3 kg at level of 240 kg ha-1 yr^(-1) in 4 cuttings, and 20.5 kg at level of 150 kg ha-1 yr-1 in 5 cuttings, respectively. Significantly higher dry matter yields appeared as 4.6 tons ha-1 at 1st cut in 3 cuttings, 3.7 tons and 4.1 tons ha^(-1) at 2nd cut in 4 and 5 cuttings, respectively. The estimated marginal dry matter yields(Ymar.) were 11.7∼12.3 tons ha^(-1) at ranges of economic N level of 285.5∼316.6 kg ha^(-1) yr^(-1) in 3 cuttings, 10.4∼10.5 tons ha-1 at ranges of 176.7∼196.6 kg ha^(-1) yr^(-1) in 4 cuttings, and 11.2∼11.6 tons ha^(-1) at ranges of 246.1∼286.0 kg ha^(-1) yr^(-1) in 5 cuttings, respectively. Maximun dry matter yields(Ymax.) were 14.3 tons at the level of limiting N(Nmax.) of 379.5 kg ha^(-1) yr^(-1) in 3 cuttings. 11.1 ton at level of limiting N of 298.4 kg ha^(-1) yr^(-1) in 4 cuttings, and 12.3 ton at level of limiting N of 467.7 kg ha^(-1) yr^(-1) in 5 cuttings, respectively. Economic N level in all cuts were in the ranges of 85.1∼116.1 kg ha^(-1) cut^(-1) in 3 cuttings, 31.3∼69.7 kg ha^(-1) cut^(-1) in 4 cuttings, and 30.8∼81.4 kg ha^(-1) cut^(-1) in 5 cuttings, respectively.

예취빈도에 따른 질소시비가 오차드 그라스의 영양가와 양분수량에 미치는 영향

조익환,전하준,김민 대구대학교 과학기술연구소 1999 科學技術硏究 Vol.6 No.2

This experiment was carried out to investigated the effects of levels of mineral nitrogen under various cutting systems on the nutritive value and nutrient yields of orchardgrass (Dactylis glomerata L.) during harvested years in 1993-1995. The contents of crude protein (CP), total digestible nutrients (TDN), relative feed value (RFV) and annual nutrient yields in relatively wet year (1993) were significantly higher than those in the other harvested years, but the tendency of contents of acid detergent fiber (ADF) and neutral detergent fiber (NDF) were against. The contents of CP, TDN, RFV of all cutting frequencies were highest at the last cut, but lowest at the 2nd cut. The annual nutrient yields were highest at the 1 st cut in 3 cuttings, and at the 2nd cut in 4 and 5 cuttings, respectively. Significantly higher contents of CP in all cutting frequencies appeared in according to increase the levels of mineral nitrogen, but the contents of ADF were lower with nitrogen fertilization of 60 kg ha^(-1) cut^(-1) in 4 and 5 cuttings than those in non-fertilized plots. Higher efficiencies of dry matter production (kg DMY kg^(-1) N), crude protein production (kg CPY kg^(-1) N) and total digestible nutrients production (kg TDNY kg^(-1) N) in response to mineral nitrogen fertilization were recorded as 12.9, 1.4 and 7.6 kg at level of 360 kg ha^(-1) in 3 cuttings, 27.3. 2.7 and 16.0 kg at level of 120 kg ha^(-1) in 4 cuttings, 20.5, 2.0 and 12.7 kg at level of 360 k, ha^(-1) in 5 cuttings, respectively. In all treatments, negative correlation between CP and ADF or NDF appeared (P<0.001). Positive correlations were recorded between CP and TDN or RFV. and among TDN and nutrient yields (P<0.01).

다공성 세라믹스에 NaX 제올라이트의 코팅

하종필,서동남,김익진 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

다공성 세라믹 기질에 제올라이트의 코팅은 기체 분리용 membrane으로 매우 효과적이다. 수열합성법으로 NaX 제올라이트를 다공성 cordierite와 cordierite, mullite 복합기질의 표면에 코팅하는 과정에서 H_2O/Al_2O_3 몰비를 500, 1000으로 증가시키면서 코팅 특성의 변화와 코팅 속도를 측정한 결과 몰비가 감소할수록 코팅층에 NaA 제올라이트의 존재비가 증가하였으며, 코팅층의 형성 속도는 증가하였다. H_2O/Al_2O_3 1000 몰에서는 반응 9일에 매우 치밀하고 균일한 NaX 제올라이트 코팅층을 얻을 수 있었으며, H_2O/Al_2O_3 1000몰에서는 반응3일에서 1000 몰의 9일과 같은 결과를 얻을 수 있었다.

연속결정화에 의한 NaX 제올라이트 단결정 성장

하종필,서동남,김익진 호서대학교 반도체제조장비국산화연구센터 2000 학술대회 자료집 Vol.2000 No.1

제올라이트의 결정성장은 유도기와 결정성장기 안정화기의 3단계로 진행한다. 이러한 제올라이트의 결정성장 기구를 이해하고 결정의 성장기를 계속적으로 연장함으로서 조대한 NaX 제올라이트 결정의 성장을 유도하였으며, 선형결정성장속도에 대하여 고찰하였다. NaX 제올라이트의 수열합성 과정중 결정성장기에 일정하게 3일 간격으로 반응용액내의 액상을 분리하고 반응겔을 보충하여 제올라이트의 합성 반응이 안정화기로 진행하는 것을 억제하고 결정 성장기를 연장하여 30 ㎛ 이상의 NaX 제올라이트 결정을 얻었다.

양극성 기분장애에서 세로토닌 수용체 유전자의 다형성(102T/C)에 관하여

지익성,신석철,왕성근,이선우,신용재,김충수,김상국,최하석,오승용,류택근,이영호 대한생물치료정신의학회 1999 생물치료정신의학 Vol.5 No.2

학습자의 진로를 고려한 IB Diploma 이수모형에 관한 연구

강익수,박하식,홍후조 한국교육과정학회 2007 교육과정연구 Vol.25 No.3

지렁이분립과 커피찌거기의 혼합상토가 케일유묘의 생육에 미치는 영향

전하준,조익환 대구대학교 과학기술연구소 1996 科學技術硏究 Vol.3 No.1

This study was carried out to find the effects of the mixtures of earthworm cast and coffee lees as a vegetable plant growth medium on the growth of hale seedlings. The mixed ratios of earthworm cast and coffee lees were 100:0, 75:25, 50:50 25: 75 and 0:100%. The results of the study are as follows: 1. The hydrogen ion concentration(pH) was recorded 7.54 in nursery soil with 100% of earthworm cast treatment, but the lower mixed ratios of earthworm cast in nursery soil were, the more it fell down. Thus, pH in 100% of coffee lees treatment and commercial plant growth medium as control treatment was showed 5.68 and 5.80, respectively. 2. The nursery sorb with 100% of earthworm cast was generally higher than treatment of the others in shoot dry weight per plant. The shoot dry weight per plant was also high in the control treatment except 3rd week, but there was no significant between the control treatment and the treatment including 75% of earthworm cast and of 25% of coffee lees. 3. As growth stages were developed, the plant iength(cm), number of leaves and diameter of stem of kale seedling were increased in all treatments. Especially, it was clear in 100% of earthworm cast treatment. In the meanwhile, the plant Iength(cm), number of leaves and the diameter of stem in the control treatment were higher than those of in treaments consisting both of 75:25 and 50:50(%) of mixing ratios with earthworm cast to coffee lees in the early growth, but in the latter growth in the mixture of 75% of earthworm cast and of 25% of coffee lees was showed a similar tendency to the control treatment.

실시간 Time Scaler 개발

정익주,조돈하 강원대학교 정보통신연구소 1999 정보통신논문지 Vol.3 No.-

Time Scale Modification refers to the process of compressing or expanding the time-scale of an audio segment. A signal which is time-scale compressed has a shorter duration, while a time-scale expanded signal is longer in duration. Simply speeding up the playback rate of a digital signal resampling causes the local pitch periods to be shortened. A signal created in this way has a shorter time-scale, but is largely unintelligible. A properly time-scale modified signal maintains properties of the original signal shch as local pitch period, speaker identity, and intelligibility. It does so by preserving the prominent features of the signal associated with these properties, namely the local pitch period. When this is performed on a voice signal, the resulting signal sounds as though the same person is talking faster or slower in the same voice. Pitch detection is used by autocorrelation using signal only. This is synthesized using PSOLA method. It shows good quality from 8khz to 22.05khz sampling rate regardless of speaker's sex or age.

RDBMS에 기반한 XML 문서에서 개별화된 노드 테이블을 이용한 String 매칭 기법

봉하익,황병연 가톨릭대학교 자연과학연구소 2006 자연과학논문집 Vol.27 No.-

1998년 W3C(World Wide Web Consortium)에서 XML(eXtensible Markup Language)이 제안된 이후 XML의 사용이 증가하였으며, 이에 따라 XML과 관련된 여러 분야에 대한 연구의 필요성이 증가하고 있다. 특히 XML로 표현된 문서에 대한 효율적인 저장, 검색, 관리를 위한 XML 문서 관리 시스템의 연구가 활발히 진행되고 있다. 이를 바탕으로 실제 많은 기관들이나 기업에서 XML 문서를 다량으로 사용하고 있음을 쉽게 확인할 수 있다. 이런 연구들 중 XRel은 많은 XML 문서 검색 기법의 비교 연구 대상이 되었으며, 이런 결과로 구조 조인 기법 같은 많은 기법들이 제시되고 있다. 이에 본 논문에서는 문서 검색 기법으로 XRel의 문자열 매칭 방식을 사용하되, 데이터베이스 내에서 Table 구조로 저장될 때 엘리먼트별로 나눠서 경로를 저장하는 방식을 제안한다. Since W3C proposed XML in 1998, XML documents have been widely spreaded in a lot of internet documents. Because of this, the need of research related with XML is increasing. Especially, it is being well performed to study XML management system for efficient storage, retrieval, and management with XML Documents. We can easily find lots of institutions and corporations are using a growing number of XML Documents. Among these studies, XRel is a representative study for XML management and has been become a comparative study. As a result, many techniques have been proposed such as structural join technique, ViST. In this study, we use string matching technique for retrieving XML document and propose path storage mechanism that stores XML document's tree paths starting with separate element in database table structure.

주요 엽채류의 가식부위내 NO₃- 함량에 관한 연구

전하준,조익환 대구대학교 과학기술연구소 1995 科學技術硏究 Vol.2 No.2

This Study was to conduct to investigate the variations of NO₃- content in the leaf lettuce depending on the amounts of fermented poultry manure and growth conditions, and to examine the accumulation of NO₃- in the edible parts of major vegetable crops which on the market. The results are as follows 1. As the amounts of fermented poultry manure increase, the accumulation of NO₃- in the leaf lettuce increase under the lower light density. 2. Although the NO₃- contents in the welsh onion(24ppm) and Chinese chieves(133ppm) on the market showed somewhat low, the NO₃- content in the pepper leaf, Japanese parsley, sinsuncho, sesame leaf showed high, respectively 1250ppm, 1260ppm, 1386ppm, and 1400ppm. 3. The NO₃- contents in the leaf lettuce and kale on the market showed high except being cultivated at the field(790ppm). Especially the kale by organic farming(6785ppm) and hydroponic leaf lettuce(6500ppm) showed very high NO₃- content.