국내 하수오니에 대한 퇴비원료로의 활용성 검토

권순익,임동규,이상범,김계훈,고문환 한국환경농학회 2003 한국환경농학회지 Vol.22 No.2

국내에서 발생되는 하수오니에 대한 퇴비원료로의 활용성을 검토하기 위하여 전국 150개소의 하수처리장 중에서 82개소로부터 88점의 하수오니를 채취하여 중금속 함량을 분석하였다. 하수오니의 구분은 하수처리장이 위치한 지역의 인구를 기준으로 광역시(100만명 이상), 대도시(50만~100만명), 중소도시(10만~50만명) 및 농총지역(인구 10만명 이하 소도시 포함)으로 구분하여 몇 가지 중금속을 분석하고 현재의 퇴비원료 기준과 비교 검토하였다. 성분별 전국적인 분포는 As 0.0~54.3 mg/kg, Cd 1.7~197.3 mg/kg, Cr 7.3~2,854 mg/kg, Cu 87.4~5,730 mg/kg, Mn 129.3~10,289 mg/kg, Ni 20.1~2,057 mg/kg, Pb 7.6~197.5 mg/kg, Zn 523.5~6,349 mg/kg의 범위에 있었다. 퇴비원료기준과 비교하였을 때 As, Cd, Cr, Cu, Ni, Pb 및 Zn 중 어느 한 성분이라도 함량이 초과하는 비율은 광역시 및 대도시는 100%, 중소도시 95%, 농촌지역 93%로 나타났다. 중금속 성분별로는 전체시료 중 As는 1%, Cd 41%, Cr 15%, Cu 53%, Ni 47%, Pb 2% 및 Zn은 89%가 기준치를 초과하였다. The objective of this experiment was to investigate the possibility on agricultural use of municipal sewage sludge with respect to heavy metal contents in Korea. Metal contents (mg/kg) in 88 sludge samples were ranged from 0 to 54.3 for As, 1.7 to 197.3 for Cd, 7.3 to 2,854 for Cr, 87.4 to 5,730 for Cu, 129.3 to 10,289 for Mn, 20.1 to 2,057 for Ni, 7.6 to 197.5 for Pb, and 523.5 to 6,349 for Zn. Heavy metal contents of sludges were compared with the regulation on raw material for compost. All sludges produced from sewage treatment plants in metropolis (over a million in population) and large cities (500,000∼l,000,000) were not compatible with the regulation. In addition, 95% of sludge from small and mid-size cities (100,000∼500,000) and 93% from rural area (below l00,000) were not suitable. On the basis of Cd, Cu, Ni, and Zn contents, 41, 53, 47, and 89% of sludge samples were not compatible with the regulation on raw material for compost, respectively.

會計公示制度의 韓·日比較硏究

權純哲,曺延煥 慶北大學校 經商大學 經濟學科 1986 慶商大學論集 Vol.14 No.-

브레이징법에 의한 TiA1 금속간 화합물의 접합에 관한 연구

권영순,권용재,김지순,김환태 울산대학교 1995 공학연구논문집 Vol.26 No.2

본 연구에서는 Al을 삽입금속으로 사용하여 브레이징법으로 접합한 TiAl 금속간화�물의 접합특성에 대하여 조사하였다. 삽입금속인 Al과 모재인 TiAl과의 반응에 의해 접합계면에서는 반응생성층으로서 경도가 모재보다 높고 취약한 TiAl₃가 형성되었으며, 접합온도가 600℃로 낮았거나 가열속도가 30K/min으로 너무 빠를 경우에는 반응생성층내에 void와 미소균열과 같은 접합결함이 존재하였다. 이와 같은 접합결함들은 700℃보다 높은 온도에서 접합하거나 가열속도를 10K/min보다 낮게 하여 접합한 경우에는 나타나지 않았다. 한편 접합체의 기계적 성질의 향상을 위하여 접합 후 Ar가스 분위기에서 열처리를 행한결과, 1300℃에서 3시간 동안 열처리를 했을 경우 모재와의 조성의 균일화가 완전히 이루어지지 않았으며 또한 반응생성층의 형태도 변화가 없었다. 그러나 1350℃에서 3시간 동안 열처리한 결과 조성의 균일화와 함께 반응생성층은 ??단상으로 변하였으며, 반응생성층의 미소경도는 층상조직인 모재의 미소경도보다 조금 낮게 나타났다. In this study, Joining properties of TiAl intermetallic compound bonded by brazing method using an insert metal of Al foil were investigated. A brittle reaction product layer. TiAl₃was formed at the joining interface and its microhardness was very higher than that of base metal. When the specimen was bonded at low temperature of 600℃ or with high heating rate of 30K/min respectively, joining defects like void and micro-crack were formed in the in the inside of reaction layer. These joining defects were disapeared when the speciment had been bonded at higher temperature than 700℃ or with lower heating rate than 10K/min. For the purpose of improving the mechanical properties of joints, effects of the post-bond heat treatment in Ar gas atmosphere on microstructure and hardness distribution of the bonded speciment were studied. When the joint was geat-treated at 1300℃ for 3 hr, homogenization of the compositions in the joining interface region was not achieved completely and morpholgy of the reaction product layer was still remained without morphological change. However, when the joint was heat-treated at 1350℃ for 3 hr, homogenization of the compositions in the joining interface region was achieved and the reaction product layer changed to γ single phase. And micro-vickers hardness of reaction layer region was slightly lower than that of base metal.

砂耕栽培에 있어서 질소 및 칼리의 施肥水準의 오이의 生育, 收量 및 無機成分吸收에 미치는 影響

權成煥,鄭淳宰,具禹書,鄭景泰 東亞大學校 大學院 1993 大學院論文集 Vol.18 No.-

This experiment was conducted to study the effect of Nitrogen and Potassium treatment on growth, yield and content of mineral elements the results were summarized as follows; 1. Growth and Yields were more effective in N treatment with 8g per plant, were more effective in K treatment with 16 me per liter 2.Content of mineral elements in leaves were a lot of N and MG in N treatment, were a lot of P content in K treatment. 3. The content of mineral of Petiol, fruit and Xyleme sap. N and K were more contented in petiole, as the others were more contented in Xyleme sap. Ca was contented a little in fruit. 4. Absorption of water was increased in the N treatment with 8g per plants, in the K treatment with 16 me liter. The contents of chlorophyll was increased as the level of Nitrogen was increased in N treatment while, decreased on young leave in K treatment.

HgCdTe 제작 다이오드 어레이의 열처리에 따른 전기적 특성

이정환,권순석,김명녕,이상래,황문구 大田産業大學校 2001 한밭대학교 논문집 Vol.18 No.-

This paper is investigated on the study of uniformity improvement and electrical characteristics for the 1×128 diode array used Hg^0.7Cd^0.3Te. The electrical characteristics were measured for the device manufactured by several different annealing processes and temperatures being discrepant from existing method of annealing processes and temperatures. The results of uniformity were improved from 60∼80[%], the rate of existing uniformity, to 99[%]. The results obtained from analyzing and examining the characteristics of current-voltage(I-V) and capacitance-voltage(C-V) are following. First, the reverse current show 6[㎁] or so. It is seemed to be resulted from the decrease of direct tunneling and trap tunneling of the device. Second, when the input bias voltage is zero, the maximum value of reverse resistance show 12[GΩ], and the mean value of reverse resistance show 5[GΩ]. Third, it is shown that the voltage of the maximum value of resistance is shifted 0.1[V] to the reverse direction.

Ni-Cr계 내열주강의 천이액상접합에 관한 연구

김환태,권영순,문진수 울산대학교 1997 공학연구논문집 Vol.28 No.2

본 연구에서는 MBF-50 삽입금속을 이용한 Ni-Cr주강(HP)의 천이액상접합시의 접합계면의 거동에 대해서 조사하였다. 접합은 진공분위기에서 1100℃∼1200℃의 온도 범위로 0∼60분 동안 행해졌으며 접합압력은 1MPa였다. 본 실험에서 얻어진 결과는 다음과 같다. 1) 1150℃에서 접합한 결과 반응층 내에는 Cr계 탄화물의 생성을 확인할 수 있었다. 2) 유지시간의 증가와 함께 등온응고는 매우 빠르게 일어나 20분 이내에 반응층이 거의 소멸되었으며 성분원소의 균일화도 거의 이루어진 상태였다. 3) 등온응고가 일어나기 이전의 접합부의 경도는 모재에 비해 높게 나타났으나, 유지시간이 증가하면서 균일화와 함께 반응층의 경도는 모재와 같게 나타났다. 4) 접합계면부의 각도를 달리하여 접합한 시편의 creep 특성을 조사한 결과 접합계면각도가 작을수록 creep 특성이 우수하게 나타났다. Transient liquid phase(TLP) bonding of Ni-Cr heat resisted casting alloy(HP) was investigated using of the insert metal MBF-50. TLP-bonding was carried out at 1100℃∼1200℃ for 0∼60min in vacuum atmosphere and bonding pressure was 1MPa. The results of this study are, 1) Microconstituents such as Cr-carbide were formed in the bonded interlayer. 2) Isothermal solidification process was very fast at the bonding temperature of 1150℃ with increasing bonding time, the reaction layer disappeared and homogenization was almost over at the bonding time of 20min. 3) The hardness of reaction layer was higher than that of base metal before isothermal solidification, as time increased the hardness was almost same as that of base metal with homogenization of chemical composition. 4) In case of sample with different bonding interface angle, the smaller bonding interface angle, the better creep property.

천이액상접합시 액상기지내의 고상입자의 거동

김환태,권영순,문진수 울산대학교 1997 공학연구논문집 Vol.28 No.2

본 연구에서는 Mo와 Fe 모재에 대해 액상소결한 삽입금속을 사용한 천이액상접합에서의 등온응고과정과 등온응고시에 일어나는 액상기지내의 고상입자의 거동에 대해 조사하였다. Mo/Mo-Ni/Mo계의 접합에서 삽입금속중의 Ni의 확산에 의해 모재에서는 재결정이 일어남과 함께 zigzag 형태의 복잡한 입계를 형성하였다. Fe/Fe-B/Fe계의 접합에서 등온응고과정은 액상기지내의 고상입자의 성장과 함께 모재와 삽입금속 계면에서의 계면의 성장에 의해 지배되었으나, Fe/Fe-P/Fe계의 접합에서는 모재와 삽입금속 계면에서 계면의 우선적인 성장에 의해 지배되었다. This study evaluated behavior of solid particles at the bonded interlayer of joints and homogenization process during TLP bonding of Mo and pure Fe with a liquid phase sintered insert metal. From the experimental results, isothermal solidification process was different from that of traditional TLP bonding. Recrystallization in the Mo base metal due to diffusion of Ni and zigzag migration of solid particle's grain boundary according to strain energy were observed at the Mo/Mo-Ni/Mo joint. In TLP bonding of Fe/Fe-B/Fe system, isothermal solidification process was controlled by growth of solid particles and migration of solid-liquid interface at the bonded interlayer of joint. But in TLP bonding of Fe/Fe-P/Fe system, isothermal solidification process was controlled only by migration of solid-liquid interface at the bonded interlayer of joint.

자궁선근증의 고찰

조환성,이해혁,정성윤,김성욱,이순곤,남계현,이임순,이권해 순천향의학연구소;Soonchunhyang Medical Research Institute 2000 Journal of Soonchunhyang Medical Science Vol.6 No.1

Objective: This study was designed to estimate the frequency and risk factor for edenomyosis Methods: The clinical records of 623 women undergoing hysterectomy were retrieved in the Department of Obstetrics and Gynecology, Soonchunhyang University Hospital, during 5 years, from Jan. 1995 to Dec. 1999. Results: The following result were obtained. 1. Adenomyosis was found in 247 of 623 patients(39.6%) 2. The highest incidence was 40-49 years of age group, an incidence of 46.6% and mean age was 44.7 years. 3. Adenomyosis was more frequently observed in parous women than non-parous women, such as 93.1% and 6.9%, respectively. 4. Dysmenorrhea, metrorrhagia, pelvic pain and vaginal bleeding were common symptom of adenomyosis, an incidence of 28.7%, 19.0%, 18.2% and 16.2%, respectively. 5. Myoma was the most combined disease in adenomyosis, showing the incidence of 54.7%. 6. Grossly, the size of uterus was enlarged more than 10 weeks gestational size in adenomyosis, an incidence of 61.9%. 7. Preoperative diagnostic accuracy of adenomyosis was 6.9%. Conclusion: The results show that deeply understanding of the common symptoms and epidemiology of adenomyosis improve the preoperative diagnostic accuracy.

誘起電壓 檢出에 의한 無整流子電動機의 始動에 관한 硏究

정형환,주수원,이권순 동아대학교 공과대학 부설 한국자원개발연구소 1985 硏究報告 Vol.9 No.2

Today, the commutatorless motor is widely sued and studided. And, the driving methed is presented. The natural commutation using the thyristor invertor is not needed the supplementary circuits and simplified the control circuits Therefore, it is expected that the reliability is increasing But, the main defects of the motor is needed the position detecting devices attached to the motor outside And, certain mechanical attachment errors affect the output and efficiency of the motor Therefore, this paper proposes the motor driving techniques without the using of the supplementary devices. With the detection of inducing voltage, control of thyristor and zero-crossing signals, it is achieved Also, it is stable and practicable in a whole ranges.

당뇨병성 동결 견에서 혈관내피 세포 성장인자의 출현

김용환,권순용,김진영,박일중,조윤경,한창환 대한정형외과연구학회 2003 대한정형외과연구학회지 Vol.6 No.2