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김진호,조광래,임수정,이경자,경기천,엄미정,김희권,김찬용,이영한,이신찬,윤순강 한국환경농학회 2003 한국환경농학회지 Vol.22 No.4
This study was carried out to evaluate the status of the groundwater quality for paddy fields irrigation in Korea. Water samples were collected at 130 sites throughout the country. Samples were collected at three seasons-April, July and October-in 2000. According to our survey, the groundwater was found to be suitable for irrigation purpose. Average EC was shown 0.286 dS/m. Nitrate-nitrogen and Cl^(-) concentration was 5.6 ㎎/L, 32.95 ㎎/L which satisfied the Korean Standards for Irrigation Water. Nitrate-nitrogen concentration in each province was shown as following orders: Jeju (11.17 ㎎/L) > Chungnam (8.16 ㎎/L) > Gyeongbuk (6.64 ㎎/L) > Gyounggi (5.91 ㎎/L) > Chungnam (4.95 ㎎/L) > Gyeongnam (3.91 mgk) > Jeonbuk (3.50 ㎎/L) > Jeonnam (3.27 ㎎/L) > Gangwon (2.91 ㎎/L). The concentration by sampling seasons were October (6.62 ㎎/L) > July (5.88 mg&) > April (4.78㎎/L). As the soil of Jeju Province is usually derived from volcanic ash soils mainly used for upland drops, it may influence the nitrate-nitrogen concentration of groundwater. The amount of rainfall also influence the water quality. But the COD_(Cr), were shown April (3.17㎎/L) > July (2.91 ㎎/L) > October (2.40 ㎎/L), it is highly related in the basal dose of organic matter fertilizers. This study demonstrated that groundwater quality was suitable for irrigation, but continuous monitoring is recommended for agricultural policy and developing OECD agricultural environment indicators.
불순물 첨가 BGO 섬광체 단결정의 육성과 열형광 특성
김성철,김중환,김종일,정중현,도시홍,김기동,이대원 동의대학교 기초과학연구소 1996 基礎科學硏究論文集 Vol.6 No.1
Eu or Fe doped BGO scintillation crystals were grown by Czochralski method. In order to get information about traps in the grown BGO crystals, we measured trap parameters including activation energy, frequency factor and the kinetic order of thermoluminescence, and compared such parameters with thermoluminescent characteristics of pure BGO scintillation crystals. In addition, optical transmittance of the grown BGO crystals was measured.
허승덕,정동근,김리석,김광년,강명구,김재룡,김기련 한국음성과학회 2004 음성과학 Vol.11 No.3
This paper introduces a development of an electrical stimulator for auditory stimulation. The electrical stimulator is useful in neurotological diagnosis, audiological evaluation, candidate selection for cochlear implantation, optimal device selection and decision making of MAP strategy for severe-to-profound hearing impaired persons. The development was based on sound parameters of auditory brainstem responses and auditory electrophysiological characteristic such as effective firing of auditory nerve and recording evoked potentials during refractory period of neuron. Besides pulse parameter could adjustable by programming for more varied electrical stimulation evoked response audiometry. Using the electrical stimulator, electrical square pulse was applied to promontory, and electrically evoked auditory brainstem response and electrically middle latency response were successfully recorded in cats.
이희봉,정재영,최현구,김기훈,김효기,주정일 충남대학교 농업과학연구소 2001 농업과학연구 Vol.28 No.2
재래종 찰옥수수 F₁ 교잡종에 대한 생육 및 수량비교를 위해 충남대학교 농과대학 실험포장에서 육성한 이들 교잡종의 식물학적 특성에 대한 연구 결과는 다음과 같다. 1. 간장은 대조구에 비해 대학찰×재래찰, FR805/1K₃×고령찰이 가장 크게 나타났으나, FR805/1K₃×대학찰, 찰옥 1호에서 대조구와 비슷하게 나타내었다. 2. 착수수는 간장에서와 마찬가지로 대학찰×재래찰, FR805/1K₃×고령찰이 대조구보다 높게 나타났으나 대학찰×재래찰, 찰옥 1호는 비슷하였다. 3. 분얼수는 각 교잡종들간에 큰 차이가 없었다. 4. 이삭의 길이는 대조구에 비해 교잡종들이 거의 2배이상의 크기를 나타내었다. 5. 이삭직경은 FR805/1K₃× 고령찰의 교잡종을 제외하고 대조구와 비슷하게 나타났다. 6. 이삭열수는 Daehakchal×1K₁/LE만이 대조구와 유의성을 나타내고 기타 교잡종은 대조구와 비슷하였다. In order to evaluate the characteristics of growth and yield in F_(1) waxy hybrids using Korean local maize lines, six hybrids including check, Chalok # 1, were planted at the experinental field of e Chungnam National University. Stem and ear heights of Yeonnong × Jaerae and FR805/IK_(3) × Koryong hybrids were higher than the check hybrid. Number of fillers per plant in all hybrids were similar as 0.3 to 0.5 per plant Ear length of waxy hybrids was longer than 15㎝ of check hybrid and ear diameter was also thicker than check except FR805/IK_(3) × Koryong waxy hybrid. A final result, Yeonnong × Jaerae among hybrids was comparatively superior to other hybrids in the test.
金靑均,文正基 弘益大學校 科學技術硏究所 1993 科學技術硏究論文集 Vol.3 No.-
The pressure distributions of impact zone, the mechanism analysis of jetting and wave formations between the two colliding plates have been simulated using the numerical hydrocode DYNA2D. The data for the computer simulation was given by the experimental results. The calulated results indicated that the sinusoidal wave and jet formation were clearly developed at the interface between the two impacting plates.
분얼형 옥수수의 식물학적 특성과 RAPD 분석에 의한 근연관계
金哲民,李喜鳳,崔現求,鄭載永,金基薰 충남대학교 농업과학연구소 2001 농업과학연구 Vol.28 No.1
분얼형 옥수수 자석계통의 식물학적 특징, 유전적 거리를 조사하여 새로운 교잡종 육성을 위한 기초자료를 얻고자 실험 한 결과를 요약하면 다음과 같다. 1. 개화기에 있어서 조사된 20계통 중 K15가 가장 빨랐고 K07이 가장 늦은 개화소요일수를 보였다. 2. 간장과 착수고는 비슷한 경향으로 보며 K04가 가장 컸고, K15가 가장 작은 것으로 나타났다. 3. 상관 분석 결과 분열수는 개화기 및 출사기와 고도의 정의 상관을 보였으며, 100립중은 개화기, 이삭높이와 고도의 부의 상관을 가지고 있다. 4. RAPD 분석결과 17개의 BAND가 나타났고 이중 1개만이 monomolpic band를 보였으며, primer 당 평균 4개의 loci를 보였다. 5. 유전적 거리와 식물학적 특성간에는 개화기, 분얼수, 엽장과 100립중에서 관련이 있었다. This study was carried out to obtain a basic information for the development of a new corn hybrid with tillers. Materials used in this study were 20 lines having three to four tillers per plant including the PI213749 U S line with non-tillers. These 20 lines were compared for the botanical characteristics and genetic distances were measured using RAPD analysis. Flowering date of the K15 was very earlier. while the K07 was very late in flowering date. Stem height and ear height were similar except for KO4 and the K15. K06, K13 and K19 lines were appeared to be resistant to lodging due to decreased ear height. Number of tillers per plant of lines used were shown three to five on average. KO9 showed the highest kernel yield, while the K08 was low. Among characteristics measured tiller per plant and flowering dates, and silking dates showed a positive correlation, while 100 kernels weight, flowering date and ear height were shown a negative with tillers per plant. A total of 17 bands by RAPD analysis using four per primer were appeared and these lines were classified into three groups, especially the third group could be classified into of four sub-groups.
수용성 키토산 유도체를 이용한 방사성 스트론튬의 시험관내 흡착능 및 마우스내 체외배출 효과
김희경,송해미,조덕제,조만기,이정석,이응호 동서대학교 부설 연구소 1996 연구소 논문집 Vol.1 No.-
키토산은 천연착화제로서 효용가치가 높은 무독성의 천연고분자로서 키틴으로부터 탈아세틸화시킨 유도체이다. 키토산에 인산기을 도입한 Water-solubel phosphorylated Chitosam(WSPC)의 Sr에 대한 시험관내 흡착률은 pH 3에서는 97.8%이었으나, pH 5와 pH 7에서는 모두 100%이었다. WSPC를 농도별(0.01%, 0.1%, 1%)로 희석하여 11주령의 ICR 수컷 마우스의 위내로 투여한 직후 Sr을 같은 경로로 처리한 다음, WSPC의 Sr에 대한 체외 배출효과와 골내 잔존률을 평가하였다. 또한 Sr와 농도별 WSPC 처리후 6일째에 척추, 두개골, 대퇴골, 경골, 치아 및 꼬리뼈 등에 대해 Sr 잔존율을 측정하였다. 0.01-0.1% 사이의 WSPC를 접종한 마우스 투여군이 Sr만 경구 투요한 대조군에 비하여 골조직에 잔존하는 Sr의 침착률이 낮게 나타났다.(P<0.01). 또한 방사성 스트론튬의 분뇨를 �蔥�배출 효과 역시 WSPC 처리군이 대조군에 비해 유의성이 인정되었고(P<0.05), 대체로 WSPC 농도가 높을수록 그 효과는 비례하였다.(P<0.05). 본 실험에 사용된 WSPC는 체내에 유입된 Sr을 제거하는데 효과가 인정되어 방사성 스트론튬의 방어약제중 하나로 활용할 수 있다고 판단되었다.