Y Nd Ba₂Cu₃O 고온 초전도체의 구조와 적외선 투과율에 관한 연구

박기홍,김재욱,김의훈,김채옥 漢陽大學校 基礎科學硏究所 1992 基礎科學論文集 Vol.11 No.-

Y??NdxBa₂Cu₃O?? 고온초전도체의 X-선 회절 분석 과 적외선 투과율 측정은 실온에서 수행되었다. 또한 수송임계 전류밀도는 77K에서 측정되었고, 저항은 80~140K 범위의 온도에서 조사되었으며, 시료들은 고상 반응법에 의해서 제조되었다. 한편 x의 양이 변함에 따라서 전이온도 Tc는 88K 근처의 값을 가지며, 거의 x의 양에 따라 변하지 않았다. 적외선 투과율 측정에서 날카로운 peak들은 472.23~618.87㎝?범위에 있었다. 이것은 특이할 정도로의 low-lying plasmalike edge와 낮은 에너지의 전자적인 여기가 존재함을 나타내는 것이다. 수송임계 전류밀도는 22~92 A/㎠ 범위에 있었다. X-ray pellet diffraction and IR transmittance measurements were been carried out at room temperature. Also the transport critical current density and resistivity of high Tc superconducting Y??NdxBa₂Cu₃O?? system were determined at 77K and in the range of 80~140 K. The sample were prepared by solid state recation. As x varied, the superconducting transition temperature Tc near 88K did not depend on x. In the infrared transmittance measurements, several sharp peaks were observed in the range of 472.33~618.87㎝-1. This indicates that unusual low-lying plasmalike edge and low energy electronic excitation exist. The transport critical current densities determined ranged from 22 to 92A/㎠.

금속파면의 프랙탈적 해석

안재우,전채홍,안종관 대진대학교 1997 大眞論叢 Vol.5 No.-

In the fracture of materials, the art of fractography is well established. However there are few quantitative rules that related the morphology of the fracture surface to the properties of the material, particularly its resistance to fracture, or to the circumstances of the fracture, sudden and catastrophic, or gradual by fatigue, etc. Fractal geometry is used in order to these quantitative relation. Fracture surface is expressed by the fractal. The fractal dimension is related to the special feature of microstructure. And fracture profiles that are generated by midpoint displacement method are in aggrement with the measured profiles.

요추 추간판 탈출증 환자 30例의 요추신연법 倂用에 대한 臨床的 考察

김재홍,조명래,채우석 大韓鍼灸學會 2003 대한침구의학회지 Vol.20 No.3

Objective : The purpose of this report is to usee more Chuna treatment clinically by comparing the improvement of Back pain and Sciatica between Common treatment Group and Common treatment with Chuna treatment Group. Methods : This study was carried out on 30 patients with Back pain and Sciatica who ere hospitalized in Dongshin Univ. Oriental Hospital form April 2001 to December, 2002. Group A of 15 patients wer taken both common treatment and Chuna treatment. And Group B of 15 patients were only taken common treatment. And after 10 days of admission, we checked and compared VAS(Visual Analogue Scale) and improvement index out of these two groups. Results : The result of the VAS(Visual Analogue Scale) and improvement index of comparison analysis between two groups after 10 days, shows that the improvement of Back pain and Sciatica in Common treatment with Chuna treatment Group is more effective than that in Common treatment Group.

산림산물의 무단채취의 실태와 관리방안에 관한 연구 : 경기도 광주군 무갑산 건국대학교 연습림 이용객 설문조사를 중심으로

김재현,채수홍 건국대학교 농업자원개발연구소 2000 農資源開發論集 Vol.22 No.-

Recently as the number of forest visitors are increasing, their illegal digging forest products in forest occurs frequently and it might result in decreasing plant diversity and eventually affect forest-ecosystem. The purpose of this study is to investigate the current state of illegal forest product digging by visitors, to collect visitor's opinions about it and to analyse them in order to provide the basic information for establishing more effective forest management policy. The investigation has been done by individual face-to-face interview with 100 forest visitors. The result shows that most respondents have a positive opinion on the regulation against illegal digging activities and regard the forest products as public goods. The total management policy for the forest products, therefore, has to be established in the basis of this result and the practical educational system, which teaches forest visitors about the regulation of illegal digging in forest, should be developed.

감광제/광촉매에 의한 시설환경의 정화

이재구,이용필,안기창,김일근,채홍민 충북대학교 첨단원예기술개발연구센터 2000 연구보고서 Vol.5 No.-

일반 생활환경 또는 원예시설 내의 공기오염물질중 하나인 잔류 농약 및 병원성 미생물을 제거하기 위한 방법으로 자연광 또는 인공광 조건에서 몇 가지의 감광제/광촉매에 의한 광분해 촉진효과와 미생물 살균효과 시험을 수행하였다. 감광제로는 quinone계 물질 PS-1, aromatic ketone계 PS-2, aromatic amine계 PS-3, organic acid salt의 PS-4, inorganic compound의 PC-1, inorganic metal compound의 PC-2와 PC3를 선발하여 사용하였다. 그리고 시험 농약으로 시설내 병해충 방제농약인 살충제 carbofuran, 살균제인 diethofencarb, metalaxyl, benomyl, thiram, propineb, iprovalicarb를 선정하였고, 유해 미생물로는 5종의 곰팡이와 3종의 세균성 식물 병원균들을 선정하였다. 농약의 광분해 촉진효과로는 대체적으로 PS-1, PS-2, PS-3, 그리고 PC-2에서 감광제/광촉매를 처리하지 않은 처리구에 비해 높은 분해율을 보였다. 미생물 현탁액에서는 광촉매에 의한 곰팡이의 살균효과는 없었으나 병원성 세균의 성장은 광촉매에 의한 저해가 뚜렷하였다. 위의 결과에서 볼 때 광조건하에서 감광제/광촉매의 사용은 농작물이나 또는 토양표면에 잔류하는 농약의 광분해나 병원성 미생물을 제거하여 보다 안전한 농산물을 생산함은 물론 토양을 위시한 주변환경중의 농약잔류물을 경감시킴으로서 환경보호 및 재배시설내의 작업자와 일반대중의 건강 증진에 커다란 도움이 되리라 기대된다. For the artificial removal of pesticide residues and pathogenic microorganisms in the greenhouse or in the living environment, the accelerated photodegradation and the biocidal effects by some photosensitizers(PS)/photocatalysts(PC) were tested under the sunlight or artificial light. The test pesticides included thiram, diethofencarb, propineb, benomyl, metalaxyl, and iprovalicarb as fungicides, carbofuran as an insecticide, and some bacteria and fungi as the pathogenic microorganisms. PS-1, PS-2, and PC-1 led to the accelerated photodegradation of all the tested pesticides compared to the control without PS/PC under the sunlight. The photocatalysts had no effect on the growth of the fungi in aqueous suspension. Whereas, the PC-2 and PC-3 added to the bacterial suspensions obviously inhibited the microbial growth under the artificial light. These results suggest that the photosensitizers/photocatalysts in the presence of light can decrease some pollutants in the facility environment and hence they can be used to reduce the exposure of the workers in the environment to the harmful pollutants. Key words: Photosensitizer, photocatalyst, photodegradation, pesticide, biocide, bacteria, fungi

파라데이컵을 이용한 플라즈마 분석

정재훈,채희백,한용진,이수빈,홍진수 순천향대학교 기초과학연구소 1998 순천향자연과학연구 논문집 Vol.4 No.2

A faraday cup has been used to obtain informations of various carbon ions in plasma generated during PLD(Pulsed laser deposition). We propose an analytical expression for the velocity distributions of carbon ions ejected in laser ablation. Under the applied voltage the Maxwell-Boltzmann distribution on a stream velocity was adopted to describe the measured velocity distributions. The kinetic ion energies are calculated to be in the range of 605.9eV to 30.7eV. The number are inverse proportional to their kinetic energies : ?? in the oder named.

심실 조기 수축의 발생 부위 및 연결 간격의 차이에 따른 혈역학적 변화

진승원,김재형,노태호,조은주,김희열,이만영,김종진,박준철,채장성,홍순조,최규보 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.7

개의 심낭내 투여한 Quinidine이 삼장 유효불응기에 미치는 영향

한명철,김재형,노태호,김희열,김종진,조은주,진승원,유기동,이만영,채장성,홍순조,최규보 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

개에서 심실 조율부위 및 조율주기에 따른 혈역학적 변화

김희열,김재형,노태호,김종진,진승원,유기동,이만영,채장성,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.9

급성 림프구성 백혈병 환자에서 발생한 침습성 국균 심내막염 2예

신성철,백경란,정재홍,송봉근,김동희,전경만,채제욱,손준성,정숙인,오원섭,송재훈 대한감염학회 2003 감염과 화학요법 Vol.35 No.5

국균은 호흡기를 통해 유입되며 심한 면역기능저하 환자에서 기회감염을 일으키는 진균이며 주로 혈관을 따라 폐를 침범하고 심장과 골침범은 매우 드문 것으로 알려져 있다. 저자들은 급성 림프구성 백혈병 환자에서 발생한 침습성 국균 심내막염을 2예을 경험하였다. 19세 남자환자로 동종 조혈모세포이식 후 발생한 고열과 요통의 원인으로 감염성 심내막염 진단하에 수술결과 국균에 의한 감염으로 확증되어 수술적 절제술과 liposomal amphotericin B로 치료하였으나 국균 심내막염의 재발과 국균 척추염의 악화, 뇌 출혈로 사망하였다. 23세 남자환자로 관해요법 후 발생한 고열과 요통의 원인으로 국균 심내막염과 국균 척추염 진단하에 수술적 절제술과 amphotericin B로 치료하여 1년 2개월 동안 국균 심내막염의 재발은 없었으나 지속적인 백혈병의 재발과 국균 척추염의 악화, 침습성 폐 국균증으로 사망하였다. Although Aspergillus endocarditis has rarely been reported, it can cause fatal complications in hematologic malignancy patients and allogeneic stem cell transplant recipients. We experienced two cases of aspergillus endocarditis developed in acute lymphoblastic leukemia patients. Case; A 19-year-old patient developed Aspergillus endocarditis after allogenic hemopoietic stem cell transplantation. He was treated with surgical intervention and liposomal amphotericin B. He died of recurred Aspergillus endocarditis and cerebral hemorrhage probably related with aspergillosis of central nervous system. Case 2; A 23-year-old patient developed invasive Aspergillus endocarditis after induction chemotherapy. Aspergillus endocarditis was successfully treated by surgical intervention and amphotericin B. He died of refractory neutropenic fever and sepsis after the third relapse of leukemia and repetitive chemotherapy. He probably had invasive pulmonary aspergillosis without evidence of endocarditis recurrence. Because the mortality of Aspergillus endocarditis is very high, early diagnosis and surgical intervention are very important for better outcome.