• 농약과학회지
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• 제10권4호
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• pp.262-265
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• 2006

피리미딘기가 치환된 3,4,5,6-tetrahydrophthalimide 유도체를 합성하였고, 밭 조건에서 토양 및 경엽처리 제초 활성을 온실에서 조사하였다. 이 화합물들의 제초효과는 화본과 잡초에 비해 광엽 잡초에서 상대적으로 우수하였으며 피리미딘 치환체의 영향을 크게 받았다. N-[4-chloro-2-fluoro-5-(2-pyrimidinyloxy)-phenyl]-3,4,5,6-tetrahydrophthalimide가 가장 강한 제초활성을 나타내었을 뿐만 아니라, 60 g $ha^{-1}$ 약량의 토양처리에서 옥수수에 비교적 안전하였다.

• Journal of Korean Neurosurgical Society
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• 제43권1호
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• pp.26-30
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• 2008

Objective : The authors developed a stereotactic device for irradiation of small animals with Leksell Gamma Knife Model C. Development and verification procedures were described in this article. Methods : The device was designed to satisfy three requirements. The mechanical accuracy in positioning was to be managed within 0.5 mm. The strength of the device and structure were to be compromised to provide enough strength to hold a small animal during irradiation and to interfere the gamma ray beam as little as possible. The device was to be used in combination with the Leksell G-$frame^{(R)}$ and $KOPF^{(R)}$ rat adaptor. The irradiation point was determined by separate imaging sequences such as plain X-ray images. Results : The absolute dose rate with the device in a Leksell Gamma Knife was 3.7% less than the value calculated from Leksell Gamma $Plan^{(R)}$. The dose distributions measured with $GAFCHROMIC^{(R)}$ MD-55 film corresponded to those of Leksell Gamma $Plan^{(R)}$ within acceptable range. The device was used in a series of rat experiments with a 4 mm helmet of Leksell Gamma Knife. Conclusion : A stereotactic device for irradiation of small animals with Leksell Gamma Knife Model C has been developed so that it fulfilled above requirements. Absorbed dose and dose distribution at the center of a Gamma Knife helmet are in acceptable ranges. The device provides enough accuracy for stereotactic irradiation with acceptable practicality.

• 한국초전도학회:학술대회논문집
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• 한국초전도학회 2000년도 High Temperature Superconductivity Vol.X
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• pp.66-69
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• 2000

본 연구에서는 STO(100) 기판 위에 PLD법으로 YBCO 박막을 제작할 때, YBCO 상과 outgrowth의 형성과정과 구조 등을 관찰하였다. 증착의 각 과정별로 박막의 표면 및 단면을 AFM과 SEM으로 관찰한 결과, YBCO 상은 작은 씨앗에서부터 계속 성장해 가며, YBCO 상은 구조를 약 한층 정도 형성하는 불과 10 ${AA}$ 정도만 증착되어도 YBCO의 XRD 피크를 보인다. 반면에 생성되며, YBCO처럼 작은 씨앗에서 서서히 성장해 가는 것은 아니라고 생각된다.

• 한국진공학회지
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• 제17권6호
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• pp.481-486
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• 2008

나트륨(Na) 함유량이 다른 세 종류의 유리관인 Borosilicate($Na_2O$ 4%), Soda-Lime($Na_2O$ 14%), 그리고 Aluminosilicate($Na_2O$ 0.06%) 유리관의 방전 실험을 통하여 유리관 내벽의 흑화를 관측하였다. 수은 혼합기체(Ne+Ar+Hg)의 방전에서 나트륨 함유량이 많은 유리관일수록 흑화가 심하게 나타난다. 무수은 가스(Ne+Ar)의 방전에서는 흑화가 나타나지 않는다. 나트륨 함유량이 많은 수은 방전 램프에서 봉입 기체의 압력이 작을수록 흑화의 정도가 커진다. 흑화 방지재를 도포한 유리관은 흑화가 미약하게 나타난다. 이 실험을 통하여 흑화는 유리재의 나트륨 성분과 수은 이온의 결합에 의한 아말감($NaHg_2$)이 유리관 내벽에 형성된 것으로 분석된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.357-357
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• 2012

The doping process of the solar cell has been used by furnace or laser. But these equipment are so expensive as well as those need high maintenance costs and production costs. The atmospheric pressure plasma doping process can enable to the cost reduction. Moreover the atmospheric pressure plasma can do the selective doping, this means is that the atmospheric pressure plasma regulates the junction depth and doping concentration. In this study, we analysis the atmospheric pressure plasma doping compared to the conventional furnace doping. the single crystal silicon wafer doped with dopant forms a P-N junction by using the atmospheric pressure plasma. We use a P type wafer and it is doped by controlling the plasma process time and concentration of dopant and plasma intensity. We measure the wafer's doping concentration and depth by using Secondary Ion Mass Spectrometry (SIMS), and we use the Hall measurement because of investigating the carrier concentration and sheet resistance. We also analysis the composed element of the surface structure by using X-ray photoelectron spectroscopy (XPS), and we confirm the structure of the doped section by using Scanning electron microscope (SEM), we also generally grasp the carrier life time through using microwave detected photoconductive decay (u-PCD). As the result of experiment, we confirm that the electrical character of the atmospheric pressure plasma doping is similar with the electrical character of the conventional furnace doping.

• Journal of Korean Neurosurgical Society
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• 제30권7호
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• pp.855-860
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• 2001

Introduction : It has been reported that the survival of low-grade glioma patients depends upon the time of malignant transformation. The authors presents the clinical analysis of histologically proven trasformed gliomas. Materials and Method : A total 92 patients who were consecutively treated and histologically confirmed hemispheric low-grade gliomas between 1980 and 1998 were analyzed and followed. All cases meet the criteria of WHO glioma classification of grade II. Results : The mean follow-up period was 73 months. Twenty two among 92 cases(24%) were histologically proven to be transformed into malignant ones. The mean time to transformation was 56 months. The 5-year and 10-year survival rates of the transformed group were 66% and 30% respectively and significantly different from the survival rates of the non-transformed group(p=0.0018). Among clinical factors at presentation, the initial tumor volume had a tendency to be larger in the transformed group than that of the non-transformed group and became significant when it was divided into more than $30cm^3$ or not(p=0.02). Among therapeutic factors, the extent of removal had no influence on the rate of malignant transformation. But postoperative radiation therapy were more frequently given to the pre-transformed group than the non-transformed group and the frequency was significantly different(p=0.02). Conclusions : The authors had found that the initial tumor volume and radiation therapy could be clinical prognostic factors for the malignant transformation of low-grade gliomas.

• 한국토양비료학회지
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• 제47권6호
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• pp.579-585
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• 2014

본 연구는 영산강간척지와 새만금간척지에서 청보리 재배시 돈분뇨액비 적정 시용수준을 구명하기 위해 전남 해남군 소재 농가포장과 벼맥류부 계화간척지에서 처리구를 무시용, 액비 50%, 100%, 150%, 200%로 두고 토양 화학성, 생육, 수량, 식물체 양분흡수 및 사료가치를 조사하였다. 돈분뇨액비의 시용수준이 증가할수록 pH는 변화가 없었으나 토양유기물 및 유효인산의 함량이 증가하였고 치환성 양이온은 영산강간척지에서 $Na^+$가, 새만금간척지에서는 $K^+$가 크게 증가하였다. 영산강간척지에서 청보리의 초장은 돈분뇨액비 100%, 150%, 200%에서 각각 102 cm에서 103 cm로 큰 차이가 없었고 새만금간척지의 청보리 초장 또한 각각 100 cm에서 103 cm로 큰 차이가 없었다. 하지만 $m^2$당 경수의 영향으로 인해 영산강간척지에서 청보리 생체수량이 $27.5ton\;ha^{-1}$에서 $32.6ton\;ha^{-1}$로 증가하였고 새만금간척지에서 $9.7ton\;ha^{-1}$에서 $11.2ton\;ha^{-1}$으로 증가하였다. 영산강간척지에서 건물수량은 각각 $10.0ton\;ha^{-1}$, $10.5ton\;ha^{-1}$이었고 새만금간척지에서 돈분뇨액비 150%시용과 200% 시용의 건물수량은 각각 $10.5ton\;ha^{-1}$, $11.2ton\;ha^{-1}$이어서 통계적으로 차이가 없었다. 식물체 분석에서는 액비 시용수준이 증가할수록 T-N, T-P, $K^+$, $Na^+$의 함량이 증가하였다. 사료가치 분석에서 조단백질은 영산강간척지에서 4.9%에서 6.7%로, 새만금간척지에서 4.7에서 7.7%로 액비 시용수준이 증가할수록 증가하였다. TDN 함량은 액비 시용수준에 따른 경향을 찾을 수 없었지만 TDN수량은 영산강간척지에서 $2.1ton\;ha^{-1}$에서 $7.4ton\;ha^{-1}$로, 새만금간척지에서 $2.0ton\;ha^{-1}$에서 $6.9ton\;ha^{-1}$로 액비 시용수준이 증가할수록 TDN 수량이 증가하였다. 두 간척지에서 청보리의 수량을 고려했을 때 돈분뇨액비 시용시 영산강간척지는 청보리 질소 표준시비량의 100%, 새만금간척지는 150% 수준을 2번 나누어 시용하는 것이 바람직하다고 판단된다.

• 한국약용작물학회지
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• 제14권5호
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• pp.303-306
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• 2006

Seed of Codonopsis lanceolata exhibits low germination due to impermeable seed coat. Prolonged seed dormancy can be overcome by the application of gibberellins, as it promotes growth of the embryo and weakens the structures surrounding of embryo. The effects of photoperiod, sugar and gibberellin concentration were investigated at constant temperature for 12 days and 22 days in vitro and invivo conditions respectively. The rate of germination of seeds of Codonopsis lanceolata in wet filter paper in both complete dark and light treatments was significantly lower than that of seed treated with $GA_3$. It clearly indicates that there is significant coat imposed dormancy in the seed of Codonopsis lanceolata. The rate of germination in vivo condition was lower than that of the in vitro condition supplemented with $GA_3$ Thus, the physical dormancy due to impermeable seed coat and low level of endogenous gibberellins in the seed was the cause of poor germination rate in Codonopsis lanceolata.

• 한국임상수의학회:학술대회논문집
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• 한국임상수의학회 2006년도 춘계학술대회
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• pp.139-139
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• 2006

• 한국임상수의학회:학술대회논문집
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• 한국임상수의학회 2006년도 춘계학술대회
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• pp.103-103
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• 2006