열확산법으로 만든 CdTe p-n 다이오드의 특성에 관한 연구

채건식,김영국,설정식,전동성 慶南大學校 附設 基礎科學硏究所 1990 硏究論文集 Vol.2 No.-

Single crystals of CdTe were grown by Bridgman method from a melt. They were contained the element of 0.1, 0.15, 0.2mole % In and 0.1mole % P as a dopant respectively. The crystallographic direction of the grown CdTe have zinc blende structure which is(331) plane 2θ=62.6。 in X-ray method. The etch pits on the (100), (110) and (111) surfaces grown to characteristics shapes with E-Ag or PBr was found to consider with the crystallographic direction denoted by simple Miller indices as is depicted schematically. Here the pits on (100), (110) and (111) show rectangular, triangular and conical shapes respectively. The results of PL measurements of undoped and In-doped CdTe showed the maximum peak at 7475 Å and 7503 Å, and P-doped CdTe by thermal diffusion showed the maximum peak at 6943 Å and 7478 Å , the former was shown by Al and the later by phosphorous. The values of the electrical chracteristics have been compared with the Yamada's and we showed the good agreements between them. The thickness if Al thermal diffusion to the CdTe crystals were propotional to the diffusion time. The properties of these cells have good rectification with forward and reverse voltage.

개선된 Bridgman법으로 성장한 Bi₂Sr₂CaCu₂O_(8+δ) 單結晶의 초전도성

채건식,손인호,설정식,이수대,김영국,전동성,오재근,강성욱 경남대학교 환경문제연구소 1995 환경연구 Vol.17 No.-

The Bi₂Sr₂CaCu₂O_(8)+_(δ) single crystals are grown from the melt using a stoichiometric starting composition fer the cautions. The size and thickness of the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals depends on the cooling rate. The lower the cooling rate, the bigger and thicker the Bi₂Sr₂CaCu₂O_(8)+_(δ) crystals become. Bi₂Sr₂CaCu₂O_(8)+_(δ) X-ray diffraction(XRD) measurements of the single crystals were carried out using the radiation source of Cu Kα . In these Patterns only the (0,0,2n) diffraction appeared. The result indicated that the cleared surface of the single crystal was of the a-b face, and that the single crystal had a single phase without any undergrowth with 7K and 85K phases. In addition, although the figure is not shown, XRD patterns from (006) to (00□) were observed in the range of 2θ=0 to 60 degrees. The characterization of as-grown single crystals have been analyzed by Laue X-ray backsdattering along the c-axis and X-ray precession experiments. The result of magnetic moment vs Tc in 10 Gauss for a crystals were measurements indicated that the samples have a superconducting transition temperature of 85K.

초유동 ³He과 경계조건

김동락,채건식,김영국 慶南大學校 附設 基礎科學硏究所 1995 硏究論文集 Vol.7 No.-

The effects of the ⁴He interfacial layer on the average superfluid fraction (pdp) were measured as a function of temeperature, pressure, and poresize by means of fourth sound propagation. Up to a pore size dependent threshold ⁴He coverage. pdp remain equal tl those for pure ³He. Beyond the threshold. pdp rapidly increase as ⁴He coverage is increased. The enhancements vanish at pressure greater than some critical pressures depending on ⁴He thickness and pore size.

랫트의 생체내 카드뮴 단독투여 및 카드뮴과 셀레늄 병용투여에 따른 필수원소의 변화

김동현,변정식,조영채,이범식,김광환,김정윤 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

This study was performed to find out the changes of essential elements as Cu, Fe, Zn, and Ca in blood, liver, kidney and testis of rats. The experimental rats were divided into 4 groups that were consisted of control group(groupⅠ), 3.0㎎Cd/kg group(groupⅡ), 3.0㎎Cd +1.0㎎Se/kg group(groupⅢ) and 3.0mgCd+2.5mgSe/kg group(groupⅣ). Each group was intraperitoneal injection with difference dose of cadmium and selenium such as 3.0mgCd/kg, 3.0mgCd+1.0mgSe/kg and 3.0mgCd+2.5mgSe/kg. Rats were killed at the time of 3 day and 28 day, and Cd, Se, Cu, Zn and Ca concentration in several organs were determined by Atomic Absorption Spectrophotometry and inductively Coupled Plasma. Cadmium content in blood, liver, kidney and testis were significantly increased in the Cd alone injection group than Cd mixed with selenium injection groups. But, copper content were not significantly differences in control and each experimental group. Iron content were significantly increased in the Cd alone injection group than others groups. Zinc and calcium content were significantly decreased in the Cd alone injection group than other groups. On the other hand the essential element content in Cd mixed with selenium injection group were almost equaled with those of control group than Cd alone injection group.

정신분열병 입원 환자에서 단축형 증상관리 훈련의 효과:예비적 연구

최충식,채정호,우동원,최영희,함웅,이규항,장미화 대한신경정신의학회 2001 신경정신의학 Vol.40 No.1

연구목적: 정신분열병 환자에서의 재활치료는 개인의 극복 기술과 능력을 향상시키고 재발을 유발시킬 수 있는 스트레스의 부정적인 영향을 중화시킴으로써 질병의 만성화를 막고 사회기능을 호전시킬 수 있기에 점차 그 중요성이 대두되고 있다. 본 연구는 만성 정신분열병 입원 환자에서 재활치료의 하나인 단축형 증상관리 훈련이 정신장애에 대한 자기 인식에 미치는 효능을 알아보기 위하여 시행되었다. 방법: 정신분열병으로 진단받고 입원 중인 환자들에게 재발경고징후를 규명하는 것, 재발경고징후를 관리하는 것, 지속증상을 극복하는 것, 술과 불법 약물을 피하는 것 등으로 구성된 승인-UCLA 사회기술 및 독립적인 생활기술훈련 단위 중 증상관리단위를 기초로 한국실정에 맞게 축약한 증산관리 훈련을 주 1회, 60분씩, 4∼5주간 실시하였고 실시 전후에 전신장애 비인식 평가 척도(Scale to Assess Unawareness ofMental Disorder; 이하 SUMD)로 자신의 정신장애에 대한 인식을 평가하였으며 임상적 전반적 인상(Clinical Global Impression;이하 CGI)로 임상 상태를 조사하였고 각 인구학적 변인들을 조사하였다. 결과: 환자 30명이 훈련을 완수하였으며 이들의 평균 연령은 36.6±7.6세였고 남자가 14명(46.7%), 여자가16명(53.3%)이었다. SUMD 점수는 훈련 전 16.9±4.0점에서 훈련 후 12.9±4.2점으로 유의하게 줄어 정신장애에 대한 자기 인식 정도가 향상되었으며(p<0.01), CGI도 훈련전의 3.7±0.9점에서 훈련 후 2.8±0.8점으로 유의하게 호전되었다(p<0.01). 환자의 연령, 발병시 연령, 유병 기간, 입원 기간, 항정신병약물 사용 용량, 교육 정도, CGI로 평가한 임상 상태등은 정신장애의 자기 인식 정도와는 관련성이 없었다. 결론: 정신분열병 입원 환자에서 단축형 증상관리 훈련은 정신장애에 대한 자기 인식을 증가시킬 수 있는 방법이 될 가능성을 확인하였으며 이 방법이 정신분열병 재활치료의 중요한 요소가 될 수 있음을 알 수 있었다. Objectives : The purpose of this study was to examine whether Symptom Management Module-Korean Brief Version(SMM-B) is effective as a psychosocial treatment of the inpat-ients with chronic schizophrenia. We also questioned which of demographic and clinical characteristics could be predictors of differential treatment response. Methods : The subjects were composed of 30 inpatients with chronic schizophrenia, who were trained with weekly session of SMM-B for 5 weeks. Before and after the training, the level of psychopathology, knowledge about schizophrenia were assessed as dependent variables by using Clinical Global Impression(CGI) and Scale to Assess Unawareness of Mental Disorder(SUMD). Results : Overall, patients showed improvement over the treatment period on psychopath-ology as well as knowledge about psychosis. Total scores of SUMD were changed from 16.9±4.0 before training to 12.9±4.2 after training(p<0.01) and scores of CGI were improved from 3.7±0.9 to 2.8±0.8<p<0.01). Howver age, gender, years of education, age of onset, duration of illness, duration of admission, numbers of psychiatric admission, and clinical status evaluated by CGI were not correlated with unawareness of psychosis. Conclusion : These results suggest that SMM-B could be a reliable method to improve self-aw-areness of psychosis in patients whth chronic schizophrenia and one of important elements in rehabilitation.

모 주물공장 근로자의 작업공정별 분진폭로량, 자각증상 및 건강진단판정 비교

이범식,조영채,변정식,김동현,원선혜,김정윤 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.13 No.-

The relationship among dust exposure dose, special health diagnosis results and subjective symptom questionaire survey for 109 casting foundry workers supervised by a local laber office has been studied from august to october 1993. Subjective symptom, dust exposure dose and health examination evaluation of respective working processes have been analized and concluded as follows; 1. Metal fume concentration in melting process measured 3.21±1.46㎎/㎥ is under threshould limit value(TLV;5.0㎎/㎥), casting sand dust measured in molding and desanding process is 5.8 ±3.41㎎/㎥ and 9.69 ±2.64㎎/㎥ which is 3-5 times higher than TLV(2.0㎎/㎥), metal fume, welding fume and metal dust in finishing process measured 9.34 ±1.32, 13.73 ±16.97 and 10.17 ±3.50㎎/㎥ respectively, which are also 2-3 times higher than TLV(5.0㎎/㎥). 2. The complain rate subjective symptoms appeal evaluated for finishing process are 35.9%, 46.2%, 27.2% and 42.2% for eye smptoms, respiractory, skin, general symptom respectively and the rates above express the highest values and the complain rates for melting process are 24.4%, 37.5% and 35.7% for eye smptoms, respiratory and mental system respectively and for molding and desanding it is 24.3%. 3. Perceived occupational disease rate is found 0.9% with are out of 109 worker surveyed who have been exposed in metal fume of finishing process. 4. 33.0% of workers surved are found to require close examination, the worker of hepatopathy suspected are 21.4% which is the highest and 3.7% for circulatory disturbance suspected. 5. The statistically significant variables in general chracteristics that affect health examination evaluation are smoking(P<0.001), respirator put-on (P<0.05) and working career(P<0.05). 6. Cough(P<0.001), "headache"(P<0.05) and "easily skin exchange by slight stimulation" (P<0.05) are statistically significant to the subjective symptom variables affect health examination evaluation.

골절의 치유과정에서 전혈중의 Ca - Mg, Zn - Cu의 농도 변화에 관한 연구

박가식,이동배,이태용,조영채 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.1

In order to investigate the hypothetic defense mechanism of essential metals which take part in the healing process of bone fracture, the author measured the changes of whole blood concentration of Ca, Mg, Zn and Cu from 88 fractured patients as experimental group, and 49 healthy, male medical students as control group, using Inductively Coupled Plasma Emission Spectrometer. The obtained results were as follows. 1. The mean concentrations of Ca at the time of fracture, at 1 month after fracture and at 3 months after fracture were 52.55± 17.37 g/ml, 60.45± 14.37 g/ml and 65.33± 16.73 g/ml, respectively and increased significantly through the healing process of bone fracture(p<0.05). The Ca concentration of fracture group at 3 months was higher than that of control. 2. The mean concentrations of Mg at the time of fracture, at 1 month and at 3 months were 26.50± 6.76 g/ml, 28.46± 6.11 g/me, 29.51± 4.32 g/ml, respectively and increased significantly through the healing process(p<0.05). The concentrations of Mg in fracture group were lower than that of control(p<0.05). 3. The mean concentrations of Zn at the time of fracture, at 1 month and at 3 months were 6.73± 1.68 g/ml, 6.48± 1.25 g/ml, 6.91± 1.58 g/ml, respectively and the changing tendencies were not statistically significant through the healing process (p>0.05). The concentrations of Zn in fracture group were lower than that of control. 4. The mean concentrations of Cu at the time of fracture, at 1 month and at 3 months were 1.04± 0.38 g/ml, 1.11± 0.46 g/ml, 1.13± 0.42 g/ml, respectively and increased through the healing process, but the changes were not statistically significant (p>0.05). The concentrations of Cu in fracture group were higher than that of control(p<0.05). 5. There were positive correlations between Ca and Mg, Zn and Cu concentrations (p<0.01) in both fracture and control groups, but no constant correlations were found in the other metals. 6. The ratio of Mg/Ca was tend to decrease through the healing process of bone fracture, but the ratio of Zn/Cu was showed no constant change in fracture group and that was higher in control(p<0.05) 7. As above results, the changes of 4 essential metal( Ca, Mg, Zn, Cu) concentrations in whole blood have meaningful role in the healing process of bone fracture.

이온교환법에 의한 탈질소공정개발의 기초연구 : 회분식 실험 Batch Experiment

이동환,채용곤,김장일,윤태경,주창식,이민규 동의대학교 기초과학연구소 1998 基礎科學硏究論文集 Vol.8 No.1

Ion exchange performance to remove nitrate in water was studied using commercially available strong base anion exchange resin of Cl^- type in the batch reactors. Anion exchange resin was more effective than activated carbon or zeolite. With large resin amount or high temperature or low initial concentration, nitrate removal characteristics for a typical gel-type resin was increased. The curves showed the generally accepted selectivity sequence as SO₄^2-$gt;NO₃^-$gt;NO₂^-$gt;HCO₃^-.

Forward형 고전압 Pulse 발생용 전원장치에 관한 연구

김경식,김동희,노채균 영남대학교 공업기술연구소 2001 工業技術硏究所論文集 Vol.29 No.1

This paper describes the forward type pulse power supply using a Power-MOSFET in the view of commercialization. The maximum value of output pulse voltage of the proposed pulse power supply system can be realized by thyristor bridge rectifier circuit and also its pulse period is determined by gate signal duty ratio of Power-MOSFET. The principle of basic operating and operating characteristics of forward type pulse power supply is presented. It is shown that theoretical and experimental results are in good agreement by comparing simulation and experimental results when a lamp type ozonizer can be used as a load. Also, experimental results indicate that the discharge and ozone concentration characteristics of the manufactured pulse power supply is more improved compare to the conventional pulse power supply. This proposed supply show that it can be practically used as a pulse power supply in various environment improvement facilities.

통풍성 관절염의 임상적 고찰

윤채중,정승문,김영학,김동규,허광식,김태원,배학연,정종훈,이승일,김평남 朝鮮大學校 附設 醫學硏究所 1997 The Medical Journal of Chosun University Vol.22 No.2

통풍은 Purine 대사의 이상으로 발생하는 질환으로, 고뇨산혈증인 사람의 전부가 통풍으로 발현되지 않고 증상의 출현 양상이 다양하여 진단과 치료에 주의가 필요하며, 조기에 적절한 조치를 한다면 충분히 조절이 가능한 질환이다. 본대학 내과학교실에서는 통풍으로 치료한 32명의 환자에서 임상양상, 병력과 검사소견을 분석하여 다음과 같음 결과를 얻었다. 1. 32명 모두 남자이며, 최초 발병 시기는 24세에서 72세로 평균 43.8±11.9세이었으며, 30대에서 40대까지가 19명(59.4%)으로 대부분을 차지하였다. 내원 당시 나이는 27세에서 75세까지로 평균 52.3±10.4세였으며, 내원시 까지 평균 유병기간은 8.5±6.8년으로 나타났다. 2. 동반 질환으로는 고지혈증 12례, 신장질환 10례, 고혈압 12례, 비만 8례, 당뇨 2례 등이었다. 3. 이환된 관절은 단관절 침범이 19례(59.4%), 다관절 침범이 13례 이었으며, 최초 이한된 관절은 족무지 중족골지골 관절로 19례(59.4%)로 가장 많았고, 통풍 결절은 20례(62.5%)에서 관찰되었으며, 유병기간이 10년 이상된 12례중 11례 (91.7%)에서 결절이 관찰되었다. 4. 평균 혈중 요산치는 9.17±1.75 ㎎/dl이었으며, 8.0 ㎎/dl에서 9.9 ㎎/dl 사이가 19명으로 전체의 59.4%를 차지하였다. Objective: The gout is a heterogeneous group of diseases resulting from tissue deposition of monosodium urate or uric acid crystals from extracellular fluids supersaturated with respect to this end product of human purine metabolism. The clinical manifestations are such as hyperuricemia, gouty arthritis, gouty nephropathy, uric acid nephrolithiasis. We analyze of clinical manifestations and associated factors in gout. Method: We have reviewed the medical records, radiologic findings and clinical results of thirty-two patients admitted at our department from April 1996 to July 1997. Result: 1) All patients were male. The mean age at initial attack was 43.8 years old, ranging from 24 to 72 years old. 2) The mean level of serum uric acid was 9.17mg/dl on admission. 3) The first metatarsopharyngeal joint was involved in 19 cases (59.4%). Tophus was observed in 20 cases (62.5%). 4) Hyperuricemia was associated with hypertension, obesity, nephrolithiasis and hyperlipidemia.