전계 발광 소자용 새로운 형광체 CaSiN_2 : Eu의 발광 특성 Eu Phosphors for Thin-Film Electroluminescent(TFEL) Devices

임성규,이순석 단국대학교 1998 論文集 Vol.32 No.-

The CaSiN_2 : Eu phosphor was tested as a possible material for thin - film electroluminescent (TFEL) device application. Ca_3N_2, Si_3N_4 and EuF_3 powders were mixed and fired for two hours under N_2 and H_2 environment at 1400℃ to synthesize CaSiN_2 : Eu phosphor. Photoluminescence characteristics of the synthesized phosphors were measured and compared with the electroluminescent characteristics of the CaSiN_2 : Eu TFEL devices. Electrical characteristics of the TFEL evices were also measured.

민감도분석을 利用한 흡착전처리 UF공정에서의 입자거동에 관한 硏究

박규홍,김성순,이 웅 中央大學校 建設環境硏究所 1997 環境科學硏究 Vol.8 No.-

To minimize fouling in ultrafilitration process, pretreatment such as coagulation, ozone, or activated-carbon is required. In this study, activated carbon adsorption was applied as pretreatment to UF process. Batch experiments were conducted to test the performance of ultrafiltration following activated carbon adsorption. The model of particle trajectory was used to compare with the experimental results. Sensitivity analysis was also performed to predict the better operation conditions in adsorption and ultrafiltration. Sensitivity analysis showed that the linear velocity was one of the main factors to maintain the high permeate flux in the pretreatment process using activated carbon. Fouling would be efficiently decreased by the active lateral-migration of suspended particles when the linear velocity of higher than 80cm/sec was used.

이온 플레이팅법으로 제조한 TiN 박막의 미세구조

권순영,김민호,이해석,손창헌,김규호 嶺南大學校 工業技術硏究所 1997 工業技術硏究所論文集 Vol.25 No.1

Hard coating의 일종인 TiN 피막을 PVD 법으로 제조할 경우, 이온 충돌 양상을 조절할 수 있는 기판 Bias와 질소 분압 등이 미세 구조와 피막 특성에 많은 영향을 미치는 것으로 알려지고 있다. 본 실험에서는 Ion plating에 의한 TiN 피막 제조에서 기판 바이어스 전압과 질소 분압을 변화시키면서 TiN 피막을 제조하고, 미세 구조를 조사하였다. 공정 변수에 관계없이 얻어진 모든 피막은 δ-TiN 단일상이었다. 질소 분압이 높아짐에 따라 우선배향은 (111)면에서 (200)면으로 바뀌었으며, (111)회절상과 (222) 회절상의 반가폭의 비는 감소하였다. 그리고 결정의 크기는 감소하는 거동을 보였으며 피막의 격자 상수는 증가하는 경향을 보였다. 기판 바이어스 변화에 대해서는 전압이 증가함에 따라 (111) 회절상의 반가폭은 -100V 가지 증가하다 그 이상에서는 다시 감소하였으며, 그 때 결정이 크기는 증가하는 경향을 보였다. 피막의 격자 상수는 기판 바이어스가 증가함에 따라 150V까지 증가하다 그 이상에서는 다시 감소하였다. The action of ionized particles has to be controlled properly in ion plating method, because the action of ionized particles has an effect on the microstructure of the thin film. In this pointview, we investigated microstructure of TiN thin film that was deposited with variables of N₂partial pressure is increased, the prefered orientation was changed(1110 plane to (200) plane, the ratio of FWHM of (222) to FWHM of (111)was decreased, grain size was decrease and lattice parameter was increased. As bias voltage was increased, the FWHM of (111) peak was increased to-100V, and then decreased with the grain size was increased. Lattice parameter of film was increased to-150V, and then decreased

지체장애인의 의료시설 접근을 위한 편의시설 개선방안에 관한 연구 : 종합병원의 외래진료부를 중심으로 Focused on the OPD in general hospital

이규일,김인순,강병근 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)

The physically handicapped people experienced many difficulties in using the medical facilities, many hospitals are not providing adequate facilities to the handicapped. This situation has been so neglected that even people with minor injuries are having trouble let alone the handicapped. A present survey was taken limited to the OPD facilities of twenty-two general and university hospitals in the metropolitan area. This study. The result of the investigation suggests that there needs to be an in-dept look into the facility manuals of OPD's for the handicapped because as of right now the Facility Installation Law is inefficient to the needs of the physically handicapped patients.

초마디 멀티프런탈 방법의 효율적인 구현

박찬규,박순달 한국경영과학회 2002 經營 科學 Vol.19 No.2

In this paper, some efficient implementation techniques for the multifrontal method, which can be used to compute the Cholesky factor of a symmetric positive definite matrix, are presented. In order to use the cache effect in the cache-based computer architecture, a hybrid method for factorizing a frontal matrix is considered. This hybrid method uses the column Cholesky method and the submatrix Cholesky method alternatively. Experiments show that the hybrid method speeds up the performance of the supernodal multifrontal method by 5%~10%, and it is superior to the Cholesky method is some problems with dense columns or large frontal matrices.

Comb 형 전극구조를 갖는 AC 플라즈마 디스플레이 패널의 전기, 광학적 특성

임성규,장호정,김동수,이순석 단국대학교 1999 論文集 Vol.34 No.-

The electrical and optical characteristics of comb type AC-PDP fabricated by the screen printing method were measured. The charge-voltage (Q-V), capacitance-voltage(C-V) and current-voltage (I-V) characteristics were also measured. The Q-V curve showed the firing voltage and transferred conduction charges and wall charges. The capacitance charge due to the charge of applied voltage was also observed from the C-V curve and it was shown that the air gap could not be considered 100% shorted during the discharge. It can be concluded that the increase of the discharge space by the comb type electrode structure reduces the firing voltage and the internal physical characteristics of the AC PDP cell can be understood by measuring various electrical characteristics.

Pyrantel Pamoate(Combantrin)에 依한 蛔蟲症의 減量療法

徐丙卨,李純炯,趙昇烈,姜信榮,梁龍石,黃邱一,朴定圭,李水月 中央醫學社 1973 中央醫學 Vol.25 No.4

The mass treatment trial with low dosage of pyrantel pamoate against Ascaris lumbricoides infection was conducted to school children in rural areas of Korea. A comparative trial in the use of piperazine salt, santonin-kainic acid complex in the treatment of ascariasis was also attempted to evaluate the efficacy of' pyrantel pamoate. A total of 804 Ascaris infected school children selected out of 822-positives, who were screened from the total 1, 699 collected specimens, were classified into 7 groups. One of the three kinds of anthelmintics, i.e., pyrantel pamoate, piperazine adipate and santonin-kainic acid complex was administered to each group according to the planned regimen. For the evaluation, the egg negative conversion rate(cure rate) and egg reduction rate were calculated 4 weeks after treatment on 623 follow-up cases with the obtained results from the stool examinations (Cellophane Thick Smear Method and Stoll's Egg Counting Technique). The results obtained were; 1. The egg negative conversion rate was the highest in pyrantel treated groups (Group 1, 2, 3), santonin-kainic acid complex treated group (Group 7) coming next, and the lowest in piperazine treated groups (Group 4, 5, 6). 2. The reduction rates were also obtained just as the same order of the above results. 3. Among the pyrantel pamoate treated groups, the low dosage groups (Group 2 8: 3) showed 90.6% and 85.7% of negative conversion rate, and 99. 2% and 98. 2% of reduction rate respectively, while 94.1% of negative conversion rate and 97.9% of reduction rate were obtained in the conventional dosage group (Group 1). 4. On the analysis of efficacy in the groups treated with piperazine adipate, the best results were. shown in 2 or 3 consecutively treated groups (Group 4 &.- 6) under the supervision of qualified doctors, and the worst was in the group treated with 2 consecutive administration by teachers without supervision (Group 5). 5. The side reactions were so negligible in all the trial groups that none of the treated cases complained about the known side effect of those anthelmintics. From the present study, it can be suggested that the pyrantel pamoate is the most effective among three drugs, and also be recommended to apply the low dosage schedule of pyrantel pamoate in the masstreatment of ascariasis to reduce the expense of masstreatment.

MgZnSiN_2 : Eu TFEL 소자의 전기, 광학적 특성 Eu TFEL Devices

장지근,임성규,이순석 단국대학교 1998 論文集 Vol.32 No.-

The Mg_xZn_1-xSiN_2:Eu phosphor was studied as a possible material for thin-film electroluminescent (TFEL) device application. Mg, Zn, Si_3N_4, and EuF_3 powders were mixed and fired at 1400℃ to synthesize the Mg_xZn_1-xSiN_2:Eu phosphor. Photoluminescence characteristics of the synthesized phosphors were measured. Electrical characteristics of the Mg_xZn_1-xSiN_2:Eu TFEL devices were also measured.

좌심실 수축기 기능장애를 동반한 양수색전증 1예

박대균,홍경순,두영철,한규록,오동진,유규형,임종윤,고영박,이광학,이영,송원근,김현태 대한순환기학회 1999 Korean Circulation Journal Vol.29 No.8

벤지딘계 염료제조 사업장 근로자의 벤지딘 폭로

노재훈,안연순,김규상,김치년,김현수 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.2

To evaluate the differences of benzidine exposure patterns of the workers in two benzidine-based dye manufacturing factories, the concentration of benzidine in air, blood and urine were measured. The air levels of benzidine dihydrochloride and benzidine-based dye were measured by high performance liquid chromatography with ultraviolet detector. Blood samples were collected at 3 hours after exposure and urine samples were collected at the end of shift. Blood and urine samples were analyzed by high performance liquid chromatography with electrochemical detector. The level of benzidine in reaction process (input, diazotization, and coupling) was 0.381±7950g/㎥. The blood benzidine was deteced in 25 workers among 38 in reaction process and their mean levels were 0.0153±.0376 ng/mg Hb. The urinary benzidine was detected for 11 workers among 38 workers in the reaction process. The level of benzidine-based dye in drying and packing process was 52.1748±14.4111g/㎥. The blood benzidine was deteced in 6 workers among 38 in drying and packing process and their mean levels was 0.0062±.0274 ng/mg Hb. The urinary benzidine was detected for 1 worker among 38 workers exposed to benzidine-based dye. The blood and urinary benzidine were detected in workers exposed to benzidine-based dye. Such results suggested that some part of benzidine-based dye was metaboized to benzidine. Therefore, some regulations for manufacturing and use of the benzidine-based dye are needed to prevent its hazards in industries.