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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.
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.
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.
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.
김기표,최정식,변건식 東亞大學校附設 情報技術硏究所 2004 情報技術硏究所論文誌 Vol.12 No.1
Although, the GPS using for user location tracking has many advantages of chasing the target in a wide area, the GPS has defect as is isn't able to chase the location in doors or basements. To make up for it's defect, we need to use the UWB signal. The UWB has not a very wide bandwidth, but low signal level under noise level and it can pass through a wall. In this report, using the time delay we simulate indoor position tracking system to chase a user among people in a building when signal is in progress
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.
치과병원에서 사용되는 진단영상에 대한 JPEG 2000 압축률에 대한 평가
정기훈,한원정,유동수,최순철,김은경 대한구강악안면방사선학회 2005 Imaging Science in Dentistry Vol.35 No.3
Purpose : To find out the proper compression ratios without degrading image quality and affecting lesion detectability on diagnostic images used in dentistry compressed with JPEG 2000 algorithm. Materials and Methods : Sixty Digora periapical images, sixty panoramic computed radiographic (CR) images, sixty computed tomographic (CT) images, and sixty magnetic resonance (MR) images were compressed into JPEG 2000 with ratios of 10 levels from 5 : 1 to 50 : 1. To evaluate the lesion detectability, the images were graded with 5 levels (1: definitely absent; 2: probably absent; 3: equivocal; 4: probably present; 5: definitely present), and then receiver operating characteristic analysis was performed using the original image as a gold standard. Also to evaluate subjectively the image quality, the images were graded with 5 levels (1: definitely unacceptable; 2: probably unacceptable; 3: equivocal; 4: probably acceptable; 5: definitely acceptable), and then paired t-test was performed. Results : In Digora, CR panoramic and CT images, compressed images up to ratios of 15 : 1 showed nearly the same lesion detectability as original images, and in MR images, compressed images did up to ratios of 25 : 1. In Digora and CR panoramic images, compressed images up to ratios of 5 : 1 showed little difference between the original and reconstructed images in subjective assessment of image quality. In CT images, compressed images did up to ratios of 10 : 1 and in MR images up to ratios of 15 : 1. Conclusion : We considered compression ratios up to 5 : 1 in Digora and CR panoramic images, up to 10 : 1 in CT images, up to 15 : 1 in MR images as clinically applicable compression ratios.
金政起,李昌孝,金潤漢 金烏工科大學校 1983 論文集 Vol.4 No.-
The poloycry`stalline material of ?? have been prepared by direct synthesis of the elements in vacuum in order to study their electrical phase transition and studied by the methods of X-ray, electrical conductivity using by four-probe and thermoelectric power. For χ=0.3 and 0.7, X-Ray diffraction patterns at room temperature show that both crystals are of single phase and the both structures are cubic spinel with lattice constants of 9.883 A and 9.922 A respectively. At room temperature the values of the electrical conductivity measurements are ?? and ??. And experimental results show that for the sample of χ=0.3 its electrical conductivity decreases with increasing temperature. The thermoelectric power values of the samples at room temperature are +40μV/K for χ=0.7. According to the measurements and the Lotgering`s energy band model our study shows that the crystals have the electrical properties of hole conduction for ?? and transits from the election conduction for?? to the hole conduction for ??.