댐건설에 따른 지표변화 분석을 위한 RS 기법의 적용에 관한 연구

정만,이근상,정재성 여수대학교 2002 論文集 Vol.17 No.-

It becomes base data for topographic and hydrologic analysis that evaluate surface change of basin, Various research using remote sensing recently is progressing, and it becomes indicator that analyze surface cange that evaluate land cover of surface using multi-spectral band. Maximum Likelihood Method is used with Landsat TM image in order to analyze surface change by yongdam dam construction in this study. There was no bi change in forest, dry field, build p area as analysis result. But, paddy area decreased from 15.07% in 1994 year to 10.73% in 2001 year that based on current water level. and, water area increased from 0.30% in 994 year to 4.01% in 2001 year that based on full water level. Also, gumgang 3 subbasin that is lowest basin showed highest water area by 23.95% of whole land cover.

Poplar 組織培養에 의한 anthocyanin 生成

李承雨,崔根元,鄭印植 경희대학교 유전공학연구소 1993 遺傳工學論文集 Vol.5 No.-

Poplar(Populus nigra)를 대상으로 組織培養時 callus 生長과 anthocyanin形成에 影響을 미치는 環境條件으로써 最適培地, 糖의 效果, 植物生長調節劑, 糖의 種類 및 日長의 影響을 검토하고자 遂行한 결과는 다음과 같이 요약된다. 1. SH 培地가 callus 및 anthocyanin형성에 효과적이었고 sucrose濃度는 5.5%가 우수하였다. 2. Auxin류의 효과에 있어서는 2,4-D 2.0 ㎎/ℓ에서 callus 및 anthocyanin형성에 가장 효과적 이었다. 3. Cytokinin류에서 BA가 kinetin에 비하여 callus生育을 顯著하게 抑制하였고 kinetin 0.2㎎/ℓ에서 anthocyanin형성이 가장 우수하였다. 4. 糖의 종류로는 fructose가 sucrose나 glucose에 비하여 callus增殖에 월등히 높은 효과를 보였고 anthocyanin形成量에는 큰 차이를 보이지 않았다. 5. 日長의 效果에서 anthocyanin形成은 日長이 길어질수록 促進되었으며 callus형성은 日長에 따른 차이를 보이지 않았다. The experiments were conducted to optimize culture conditions for callus growth and anthocyanin formation by in vitro culture of Populus nigra through tests of basal media, inorganic salts, plant growth regulators, sucrose concentrations, sugar and photoperiods. SH media supplemented with 55 g/l sucrose gave the best results in callus and anthocyanin formation. For the effects of plant growth regulators, anthocyanin formation was promoted by treatment with 2.0 ㎎/l 2,4-D. On the other hand, 0.2 ㎎/l kinetin showed the highest activity for anthocyanin synthesis while BA severely suppressed callus growth. Fructose compared with glucose remarkably promoted callus growth but anthocyanin formation showed no difference with sugar type. Anthocyanin pigment accumulation hastened by increasing photoperiod in culture room while callus growth was not affected with photoperiod.

스펙트럼 확산 통신방식을 이용한 LAN의 구성

이동욱,김명기,이취중,김근중 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.1

A spread spectrum(ss) communication system has a lot of advantage, such as realization of asynchronous code division multiplexing(CDM), robutness to narrow-band interference, imulse noise, privacy function, and so on. We have considered utilization of these advantage to develop a local area network(LAN) using such a transmission channel as a power-line. In this paper, we investigate its performance by constructing a LAN using SS technique.

地域社會의 情報化 促進方案에 관한 硏究 : 大田·忠淸地域을 中心으로

李根植,金能鎭,鄭相喆 충남대학교 경상대학부설 경영경제연구소 1991 경영논집 Vol.7 No.2

Tantalum Pentoxide 박막의 전기적 특성에 관한 연구

장충근,송재용,이기선,강준길,김수용 충남대학교 1990 忠南科學硏究誌 Vol.17 No.2

Thin tantalum pentoxide(Ta_2O_5) films were deposited by oxygenassisted pyrolysis of tantalum methoxide using LPCVD method and their UV-absorption characteristics, X-ray diffraction, surface structure and I - V characteristics were investigated. Ta_2O_5 films as grown were originally amorphous and became polycrystalline hexagonal δ-Ta_2O_5 after annealing at 800℃ in the nitrogen gas atmosphere for 4 hours. The structures of the si_3N_4 films deposited by LPCVD were basically amorphous but mixed micro crystallites were observed in the films. For the Ta_2O_5 films of about 1000Å thick, the leakage current density through the films was 10 exp (-7) A/㎠ at 5 MV/㎝. The leakage current density was high and breakdown voltage was low with respect to Si_3N_4, Ta_2O_5 films could make them attractive in multiplayer dielectric thin films for memory devices.

RF-MSP에 의한 LiCoO₂박막전극의 형성에 관한 연구

박정후,이우근 釜山大學校生産技術硏究所 1997 生産技術硏究所論文集 Vol.53 No.-

LiCoO₂는 높은 전기충전밀도를 가진 전지로서 기대되고 있는 리튬 2차전지의 양극물질이다. 최근에는 주로 고출력 2차전지에 대한 연구가 활발히 진행되고 있다. 만일 리튬 2차전지가 IC 기판에 박막으로 제작된다면 이것은 IC 칩, 마이크로기기, 박막형 전자 디스플레이 소자 등의 전원으로 사용할 수 있다. LiCoO₂박막은 CVD, Laser 증착, E-beam, 스파트링 등의 방법으로 제작할 수 있으나, 전지에 고성능의 양극으로 사용하기 위해서는 격자상수와 조성비를 맞추기 어렵다. 본 연구에서는 반응성 마그네트론 스파트링을 이용하여 기판의 온도와 산소분압을 변수로 하여 LiCoO₂박막을 제작하였다. 기판온도 700℃, 산소분압 5%에서 전지로서 가장 적합한 격자상수와 결정구조를 나타내었다. LiCoO₂is a electrode material of Li ion cell which is expected as the cell with a very high electric charge density. The recent study is mainly to focused on a high power secondary cell. If very thin Li ion cell can be made in the scale of IC substrate, it can be a electric source in IC ship, micro machine or very thin electrical display etc. LiCoO₂thin film can be made by CVD, laser ablation, E-Beam, ion beam process, sputtering etc. But, it is difficult to make the material with a high quality for a cell as the electrode of a cell with the same ratio in components and a lattice parameter bulk etc. In this study, LiCoO₂is made by R.F magnetron sputtering with the variance of substrate temperature and oxygen partial pressure etc. At the substrate temperature of 700℃ and the oxygen rate of 5%, we can acquire the good thin film LiCoO₂compared with a bulk material.

Hg₁-xMnxTe산화막의 홀효과에 관한 연구

오재근,최기영,송재흥,김영국,채건식,주유환,설정식,손인호,차성극,이상찬 慶南大學校 附設 基礎科學硏究所 1996 硏究論文集 Vol.8 No.-

HClO₄(pH:2) 수용액에서 양극산화 방법으로 HgMnTe(HMT)의 표면에 산화막을 형성 시켰다. 산화막의 두께는 SEM으로 측정하였으며 10㎛였다. 전류-전압 특성곡선을 얻어 산화 피크 전압으로부터 HTeO₂?, TeO?, HHgO₂? 막이 형성되었음을 알 수 있었다. 산화시키지 않은 HMT와 HClO₄수용액에서 산화시킨 HMT에 대해 Hall전압 및 자기저항을 각각 측정하였다. 홀전압과 자기저항은 HMT보다 HMT산화막에서 더 컸으며 이것은 HHgO₂? 공격자가 홀의 역할을 하고, TeO₄? 산화막은 전하의 포획도를 낮게하기 때문으로 생각할 수 있다. Anodic oxidation processes on HgMnTe surface has been studied in standard aqueous HClO₄(pH:2) solution. The 10㎛ thickness of the anodic oxide layers was measured by SEM. The Composition of the anodic oxide layers are evaluated from current-voltage(I-V) characteristic of HgMnTe Oxidation. The layers are composed of mixed oxide. ??, TeO₄, and?? in HClO₄solution. Transport properties have been investigated in HMT oxide layer made in HClO₄solution and virgin HMT samples at 300K. Hall voltage and magnetoresistance are greater in oxide layer HMT than virgin HMT. As a result, we know that the vacancy of ??in an anodic oxide layer acts as hole and the resulting oxide ?? layer exhibit a reduced degree of charge trapping and increase magnetoresistance.

포플라 Callus의 배양환경에 따른 Anthocyanin 생합성

방혜진,이승우,최근원,정인식,설일환 경희대학교 생명자원과학연구원 1997 遺傳工學論文集 Vol.9 No.-

Studies were carried out to investigate the effects of various cultural and environmental conditions on callus growth and anthocyanin biosynthesis of the callus derived from the leaf discs of the Populus hybrid (Populus nigra × Populus maximowiczii cv. Yanghwangchul). Even though the largest amount of anthocyanin was obtained from the calli grown in the vessels illuminated with white fluorescent light, no significant differences in callus growth could be obtained among other vessels illuminated with different light qualities, i.e., red, yellow, blue, green and dark. Callus growth and anthocyanin biosynthesis were promoted by long-day conditions (16-hour photoperiod or longer). The calli grown in Schenk & Hildebrandt (SH) medium continuously (SH→SH) showed the best growth whereas the highest amount of anthocyanin biosynthesis was obtained in the calli grown in SH→SH or SH→White media.

측두하악 장애의 정신생리학적 측면에 대한 예비적 연구

손봉기,이정구,최인근 大韓神經精神醫學會 1991 신경정신의학 Vol.30 No.6

This study was designed to investigate the psychophysiologic aspects of temporomandibular disorder. Using various test batteries, 67subjects(33 of TMD patients and 34 of controls) were evaluated and the responses were analyzed through SPSS program. The results were as follows : 1) The score of social readjustment rating scale was significantly higher in the female patient group than in the female control group. 2) The patient group was less responsive to the pressure from financial difficulties, and the male patient group was less responsive to the changes in relationship and the pressure from financial difficulties than their respective control group. 3) Compared with the control group, the patient group was unfamiliar with the three coping strategies, namely shared concern, redefinition, and acting-out. Female patients were unfamiliar especially with the redefinition and acting-out, but very familiar with the compliance. 4) The patient group and the female patient group attained significantly higher score in Zung's self-rating depression scale than the control groups, respectively. 5) The scores of Hs. D, and Hy scales of MMPI of the patient group were significantly higher than those of the control group, and 1-3-2 type was most frequently noted in the patient group, though not significant.

고속 플라즈마 진단용 능동회로의 설계 및 응용

김두환,이우근,박정후 釜山大學校生産技術硏究所 1995 生産技術硏究所論文集 Vol.49 No.-

본 논문에서는 자화 플라즈마의 파라메타를 측정할 수 있는 고속 푸르브 구동시스템을 구현하였다. 이 시스템은 1[msec] 이내에 -40 - +40[V]에 이르는 톱니파 전압을 푸르브에 인가시킬 수 있을 뿐만 아니라, 2회 연속 미분을 행하여 전자에너지 분포함수를 구할 수 있었다. 이와 같이 고속 푸르브 구동시스템 및 2회 연속 미분회로를 이용하여 고속으로 거의 전형적인 푸르브 특성곡선을 얻을 수 있었고 2회 연속 미분회로로써 얻어진 전자에너지 분포하수에서 플라즈마의 중심부 보다 플라즈마의 가장자리에 고에너지를 가진 전자들이 많이 분포함을 알 수 있었다. In this paper ,we have realized the high speed probe driving circuit system which can measure the plasma parameters of magnetoplasma. By this system, the probe voltage can be seeped in a 1[msec] order. In addition, we can obtain the electron energy distribution function in magnetoplasma by using two differentiators. In this study, we obtain a complete probe characteristics, and find that the electron energy measured at the edge of plasma is larger than of electron measured at the center of plasma