Fine-Blanking시 전단 단계별 변형 거동에 관한 연구

이종구,박원규 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.4

One characteristic of Fine-Blanking is that the size and the direction of stress and strain are very complex in the plastic flow according to the condition of blanking. Especially, they are affected by the clearance of punch and die, by the force of blanking holder and by the force of counter punch. The purpose of this research is to know the deformation behavior in shear zone more clearly, based on Green & Cauch's large deformation theory. The deformation behavior and cracks were investigated in each step of shear, according to punch penetration increase, the use V-indenter ring the hardness of materials. This research found that the transforming behavior was the same as pure discretion, and the cracks could be prevented when hardness is low.

장애인생활시설 개별화 프로그램 분석 연구

이상복,구원옥,이원령,신윤희,박영균 대구대학교 특수교육재활과학연구소 2005 특수교육재활과학연구 Vol.44 No.1

본 연구는 장애인생활시설에서 생활하는 장애인의 사회 복귀를 위한 재활서비스 중 교육서비스를 보다 전문적으로 제공하기 위해 장애인생활시설에서 실시된 개별화프로그램을 분석하는데 목적이 있다. 이러한 연구 목적을 바탕으로 사회복지법인 성요셉 복지재단 S재활원, S요양원을 선정하였고, S재활원에서 2년 간 실시된 개별화프로그램의 장기목표, 단기목표, 계획평가 자료를 빈도 분석하여 퍼센트(%) 처리(Valid Percent)를 하였다. 장애인생활시설에서 실시된 개별화프로그램 특징은 다음과 같다. 첫째, 자립생활과 사회 복귀를 위해 필요한 기초생활기능의 습득에 중점으로 두고 있었으며, 연구대상시설이 생활시설이기 때문에 가정에서 이루어지는 일상생활기능 습득이 우선으로 이루어지고 있었다. 둘째, 지체부자유 장애를 지닌 생활인은 운동기능의 습득과 보행에 관련된 교육계획 비율이 높으며, 정신지체 장애를 지닌 생활인은 소근육 운동, 협응, 건강관리와 관련된 교육이 이루어졌다. 셋째, 기본적인 사회 생활에 필요한 글자 읽기, 수세기, 셈하기 등의 기초적인 학습기능을 습득할 수 있는 교육계획이 실시되었다. 넷째, 교육계획에 대한 생활인의 성취 정도는 평균적으로 60% 정도로 다소 낮게 나타났다. The purpose of this study was to analysis of individualized education program for the people with disabilities in the residential facilities. As the subject of research, 2 residential facilities in the Sungyoseb Welfare Foundation participated in the study. Long-term goals, short-term objectives and evaluation result in the individualized education programs carried out in 2 residential facilities for the past 2 years were analyzed a frequency and showed percent(%). The results showed as follows : Analysis results of Individualized Education Program for the people with disabilities in the residential facilities are shown like following; First, the facilities manly provided the persons with disabilities with the educational programs for improving basic functional skills in their daily living lives. Second, the persons with physical disabilities was provided with the educational programs for improving in their motor skill and self-walking. And the person with mental disabilities was provided with the educational programs for improving in their promotion of health. Third, the persons in facilities was provided the educational programs for improving basic learning skills like a counting, reading, calculating in their social living. Fourth, the recording data sowed the average 8 out of 10 short-term plans were reached to about 60% of the unsatisfactory levels.

금속가공유 사용 근로자에서 발생한 과민성폐장염 1예

이선웅,고동희,진구원,박동욱,이정탁,송윤희,이상윤 大韓産業醫學會 2008 대한직업환경의학회지 Vol.20 No.1

서론: 과민성폐장염의 원인물질로 금속가공유는 외국의 경우 작업장의 집단발병 사례들을 중심으로 많은 보고가 되어 왔으나 우리나라에서는 아직 보고되지 않았으며,저 자들은 금속가공유에 1년간 노출된 근로자에서 발생한 과민성폐장염 1예를 발견하였기에 작업환경측정을 시행한 후 작업관련성을 평가하여 보고하는 바이다. 증례: 64세 남자 환자가 1년간 강관을 절단하는 작업을 한 후 호흡곤란을 주소로 내원하였다 노출력,임상적 소견 및 방사선학적 소견을 토대로 과민성폐장염으로 진단되었다. 작업환경 측정결과 공기 중 금속가공유,엔도 톡신,총 세균 및 곰팡이는 각각 0.531 mg/m³, 6.33 EU/m³ 100 CFU/m³ 및 75 CFU/m³이었고,금속가 공유 내 엔도톡신,총세균 및 곰팡이는 각각 1.5x10⁴EU/mL,4.6x10^(5) CFU/mL 및 1.8×10^(5) CFU/mL이었다. 고찰: 금속가공유 내의 원인항원에 대한 침강항체를 검사하지 못했으나,작업환경 측정결과 금속가공유가 일반적인 허용가능 수준 이상으로 오염되었으며,기존의 과민성폐장염 발생 사례들과 비슷한 수준 또는 그 이상으로 오염되어 있었다. 공기 중 금속가공유 농도 역사 NIOSH의 REL과 ACGIH의 NIC를 초과하고,기존의 사례들에 비해서도 대체적으로 높은 수준 이었다. 금속가공유 이외의 다른 원인에 대한 감별과 기존의 발생사례들과의 노출수준 비교를 통하여,저자들은 환자가 금속가공유에 의한 미생물 항원에 노출되어 과민성폐장염이 발생한 것으로 판단하였다. Introduction: There have been no reports of hypersensitivity pneumonitis caused by metal working fluids in Korea, despite their existence in other countries. Here, we report the first such case, along with an assessment of work-relatedness through exposure assessment. Case report: A 64-year old male patient visited the hospital with dyspnea after metal pipe cutting for about a year. He was diagnosed with hypersensitivity pneumonitis from the evidence of specific exposure history, clinical symptoms, and radiologic findings. The air exposure levels of the oil mist, endotoxin, total bacteria and fungus in the work environment was TWA(8-hr) 0.531 mg/m³, 6.33 EU/m³, 100 CFU/m₃ and 75 CFU/m³, respectively. The concentrations of the endotoxin, total bacteria and fungus within the metal working fluid was 1.5 X 10⁴EU/mL, 4.6 X 10^(5) CFU/mL and 1.8 X 10^(5) CFU/mL, respectively. Discussion: Although the patient did not receive a specific precipitating antibody test, the microbial concentration within the metal working fluid was higher than normal and similar to previous case reports, The oil mist level in the air exceeded the NIOSH REL and ACGIH NIC, and were similar or higher than previous cases. By excluding other causes of hypersensitivity pneumonitis, we concluded that the disease developed from exposure to microbial antigens in the metal working fluid.

IL-4와 다른 여러가지 cytokines이 사람 편도 단핵세포의 IgE 생산에 미치는 영향

이헌구,송원재,하대유 大韓免疫學會 1995 大韓免疫學會誌 Vol.17 No.3

The present study was desinged to compare IgE producing ability of cultured human tonsillar mononuclear cells (TMNC) stimulated by rhIL-4 between complete Iscove's modified Dulbeco's medium (C-IMDM, which was composed of IMDM enriched with bovine serum albumin, fetal calf serum, transferrin, insulin, and mixture of saturated and unsaturated fatty acids) and RPMI-1640 supplemented with FCS (RPMI-1640), as well as to investigate a single or combined effects of IL-4 and 7 different human cytokines (IL-2, IL-5, IL-6, IL-7, TNF-a, IFN- 7' and TGF-fi ) in a culture system on IgE production of human TMNC. It was found that C-IMDM was superior to RPMI 1640 as a culture medium for supporting the synthesis of IgE by TMNC stimulated with rhIL-4. In fact, RPMI-1640 failed to induce significant IgE synthesis by TMNC cultured for 21 days in the presence of rhlL-4 (100 U / ml). In addition, 7 different cytokines other than IL-4 failed to induce the significant IgE synthesis by TMNC cultured in C-IMDM when tested alone. However, IL-2 or IL-6, which was ineffective in inducing IgE production when tested alone, enhanced IL-4-mediated IgE production, indicating - that IL-2 or IL-6 acts synergistically with IL-4. In contrast, IFN- Y . or TGF-J1 demonstrated the inhibition of IL-4 dependent IgE synthesis by TMNC. Interestingly, IL-5, IL-7 and TNF-a had no modulatory effect on the IL-4 dependent IgE response in the applied experimental conditions. Taken together, the present results strongly suggested that 1) C-IMDM may be superior to RPMI-1640 as a culture _medium for IgE production, 2) Only IL-4 had the ability to stimulate in vitro with IgE synthesis by TMNC when tested alone. 3) IL-2 and IL-6 may be synergistic with IL-4 in IgE synthesis, 4) IFN- F and TGF-P may have the antagonistic effects on IL-4 dependent IgE synthesis and 5) IL-5, IL-7 and TNF-a may have no modulatory effects. This study also suggested that increased insight into various mechanisms of IgE regulation by cytokines may eventually lead to improve therapeutic strategies in the clinical management of IgE-mediated allergy.

장애인생활시설의 교육서비스 요구 분석

이상복,김춘희,유은정,이원령,구원옥 대구대학교 특수교육재활과학연구소 2004 특수교육재활과학연구 Vol.43 No.1

The purpose of this study was to provide suggestions for the future 2year educational services based on the on-going education services for the persons with disabilities in the facilities. The results of the study were as follows. First, the facilities manly provided the persons with disabilities with the educational programs for improving basic functional skills in their daily living lives. Second, the recording data showed that average 2 out of 10 short-term plans were reached to above 80% of successful performance levels, and the rest of the 8 plans were reached to between 11% and 79% of the unsatisfactory levels.

라덱스 혼입률에 따른 철근콘크리트의 휨파괴 거동특성

정원경,김동호,이주형,임홍범,윤경구 江原大學校 産業技術硏究所 2002 産業技術硏究 Vol.22 No.A

Reinforced concrete(R/C) is commonly used to structures because they have many merits that compressive strength, economy and so on. However, reinforced concrete has a crack at the tensile section which is due to the relatively lower tensile strength than its compressive strength. Latex modified concrete(LMC) has higher tensile and flexural strength than the ordinary portland cement, due to the interconnections of hydrated cement and aggregates by a film of latex particles. The purpose of this study was to investigate the flexural behavior of reinforced concrete beam with latex modified concrete, having the main experimental variables such as concrete types(ordinary portland cement concrete, latex modified concrete), latex contents(0%, 15%), flexural steel ratios(0.012, 0.0235), and with/without shear reinforcement. The beam of LMC showed considerably higher initial cracking loads and ductility than that of OPC, but, similar to ultimate strength and deflection. This might be attributed to the interlocking of hydrated cement and aggregates by a film of latex particles, water retention due to hydrophobic, and colloidal properties of the latexes resulting in reduced water evaporation. The beam with latex modified concrete could be adopted at field for controlling and reducing the tensile crack due to its higher tensile strength.

압축강도 평가를 위한 지능형 응력예측기 구축

박원규,우영환,이종구,윤인식 한국공작기계학회 2001 한국생산제조학회지 Vol.10 No.6

This work is concerned with construction of the intelligence stress predictor for compression strength evaluation using neural network-ultrasonic waves. The contact pressure in jointed plates was measured by using ultrasonic technique. Neural network is used to evaluate and predict contact pressure from the results of the calibration curves. The organized neural system was learned with the accuracy of 99%, as a result of learning the ultrasonic echo ratio to the contact pressure measurement between SM45C and STS410 materials. And it could be evaluated and predicted with the accuracy of 90% in the evaluation of ultrasonic echo ratio difference in the same surface roughness and contact pressure, and 85% in the prediction of virtual ultrasonic echo ratio. Thus the proposed stress predictor is very useful for the evaluation and prediction of the contract pressure between SM45C and STS410 materials.

국내에서 생장한 Kenaf의 해부학적 특성

권영만,황원중,권성민,조준형,이명구,김남훈 江原大學校 森林科學硏究所 2005 Journal of Forest Science Vol.21 No.-

국내에서 재배한 kenaf의 해부학적 특성을 광학현미경법으로 조사하였다. Kenaf의 수피부에는 인피섬유, 사부방사조직, 피층유세포 등이 존해하였고, 목질부는 도관, 목섬유, 방사조직 등으로 구성되어 있었다. 도관은 고립관공과 2~3개가 방사방향으로 복합한 복합관공이 많이 존재하였고, 방사조직은 평복, 직립, 방형세포가 모두 분포하고 있었다. 접선단면에서 방사조직은 단열 및 다열방사조직으로 구성되었다. 수피비의 인피섬유층은 생장기간과 함께 증가하였다. Anatomical properties of Kenaf cultivated in Korea was investigated using light microscopy. Bast fiber, phloem ray and cortex parencyma cell were observed in bast, and vessel, wood fiber and rat in core. A lot of solitary and multiple radial pores in core existed. The cell type of ray parenchyma in radial section was procumbent, upright and square sell. Uniseriate and multiseriate rays existed in tangential section. The layer of bast fiber in bast increased with in creasing the growth period.

내동정맥루술후의 수지운동이 동정맥루의 혈류와 개존에 미치는 영향

신현석,조원현,이성문,우성구,김현철 大韓脈管外科學會 1995 大韓脈管外科學會誌 Vol.11 No.1

유기성 폐기물 재활용을 위한 공정시스템 개발

염성배,임원구,이창환 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-

The change of the culture in dietry life and the population centralization to the cities increase the amount of food wastes of the cities. Then the economical and efficient treatment of food wastes become a great social problem. In this study, we intended to seek the recycling way of food waste as fertilizer and feed of beast through chemical and physical analysis on its component. The conclusions of this study is as follow. 1. The ratio of C/N is about 10 and the weight percentages of K, N, P, are 0.97, 1.0, 4.5 respectively. Then we must add rice bran and sawdust as subsidizing material to the food waste. 2. The legal permitted limit of salt is 2.5%, and the average salt content in food waste is 3.3% then we must reduce the salt concentration of food waste. 3. The value of SAR of food waste is 4.4%.