보상형 PID 재어기를 이용한 DC-서보모터의 속도 제어 시뮬레이션

박윤명,장종승,추연규,임영도 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

본 논문은 Fuzzy Logic Controller를 이용하여 입력을 보상한, 보상형 PID 제어기를 제안한다. 이 제어기를 사용하여 DC-서보모터의 속도제어 특성을 조사하고, 단순 PID 제어기와 비교하여 제안한 제어기의 성능을 평가하였다. 성능 평가 방법은 MATLAB을 이용하여 DC-Servo Motor와 유사한 가상 플랜트를 설정하고, 부하 및 무부하시의 보상형 PID제어기와 단순 PID 제어기의 속도제어 성능을 모의 실험하였다. 모의 실험 결과 보상형 PID 제어기의 성능이 더 우수한 것으로 나타났다.

벼 육묘기 개발 및 육묘 실용성

박성태,김상열,황동용,홍연규 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.3

벼 농사에서 기계화가 어려운 육묘를 못자리 없이 간편하고 저비용으로 할 수 있는 육묘기 개발 및 개발 육묘기의 실용성 평가시험 결과를 요약하면 다음과 같다. 1. 개발 조립식 육묘기는 파종상자 치상선반, 플라스틱판, 부직포와 비닐로 만든 보온덮개로 구성되어 있고 35상자 육묘용 육묘기는 규격이 가로 152㎝, 세로 63㎝, 높이 147㎝이며 무게 75㎏이며, 육묘일수에 따라 육묘선반 간격을 간단히 조절할 수 있다. 2. 개발 육묘기를 이용 육묘시 묘소질은 관행 못자리 모와 비슷하고 결주율는 3.2%로 못자리 육묘상자모 2.8%와 거의 같았다. 3. 개발 육묘기는 대당 20만원정도로 기존 자동화 육묘시설 (198평:7,360상자 육묘기준 및 장비에 비하여 시설비가 43% 절감 된다. 4. 육묘 노력시간은 개발 육묘기는 ㏊당 7.9시간으로 자동화 시설육묘 및 못자리 육묘에 비하여 각각 18%, 76%절감 되었다. 5. 물 사용량은 개발 육묘기 이용 육묘는 ㏊당 2.5kl로 자동화 시설육묘 및 못자리 육묘에 비하여 6~8배 절감되었다. Raising seedling in nursery bed needs not only a lots of time but also labor input which are hard especially to the old and lady farmers. On the other hand, construction of seedling raising facilities such as automated seedling raising house also requires a lots of money. To overcome those problems, a simple seedling raising shelf, which is not necessary for preparation of the seedling raising nursery bed, was developed and its feasibility of seedling raising was evaluated. The dimension of the seedling raising shelf has 152㎝ in length by 63㎝ in width with 147㎝ in height. The shelf is composed of 6 to 7 layers of shelf frame, plastic tray for seedling raising, water supply pipes and white polyester cover. The height of a seedling raising shelf can be adjusted to 6 or 7 layers simply by changing the height of plastic pipes. One unit shelf can accomodate 30 to 35 seedling trays which can transplant about 1000 ㎡ rice field. The seedling height and dry weight of rice seedling grown in the shelf-type seedling raising apparatus was not significantly different from those seedlings grown in the conventional nursery bed. Missing hill percent-age of the seedling grown in shelf-type seedling raising apparatus was 4.3% similar to that of nursery bed of 4.3%. The seeding raising shelf has following advantages. The seedling raising shelf reduces cost of the seedling raising facilities by 43%, labor input hour by 18%, irrigation water saving by 83% versus automated the automated seedling raising house and labor saving by 76% and irrigation water saving as much as 6~8 times versus the conventional seedling raising method of nursery bed.

주물사업장에서 발생하는 호흡성분진의 농도 및 석영함유량에 관한 연구

박용선,노영만,김현욱,한진구,안연순,강성규,김정만 한국산업위생학회 2003 한국산업보건학회지 Vol.13 No.1

This study was performed to measure and evaluate the concentration of respirable dust and quartz content at molding and shakeout process in the foundry. The 129 samples in 30 foundries were collected using 10mm Dorr-Oliver nylon cyclone and analysed for quartz concent by Fourier Transform Infrared Spectroscopy. The average quartz concentrations in the respirable dust was 0.0273mg/㎡ and ranged from 0.0007 to 0.3757mg/㎥. The average quartz concentrations of shakeout process wsa significantly higher than that of molding in the foundry. The average of respirable dust in foundry 102129mg/㎡ and ranged from 0.1524 to 7.0428mg/㎥. But there is no significant difference between molding and shakeout processes. The average contents of quartz for OEL-MOL was 2025% and ranged from 0.05 to 32.79% The non-compliance rates for quartz were 22.96% in Korea-OEL and 34.01% in ACGIH-TLV and NIOSH-REL, and 35.03% in OSHA-PEL. The airbome dust in the foundry was effectively controlled when local exhaust ventilation and/or wetting system were operated. The result of this study therefore showed that the engineering controls and periodic environmental suveillance in foundry will be very important for preventing the health effects of workers exposed to quartz.

大豆의 增收要因 究明에 關한 硏究

朴然圭 충북대학교 농업과학기술연구소 1990 農業科學硏究 Vol.8 No.1

Defining optimum vegetative growth is important to provide fundamental informations for the improvement of cultural practices in soy bean. To provide these informations, three soy bean varie-ties, Hwanggeum, Paldal and Bokwang, were tested at different planting times, fertilizations and sowing densities at the Experimental Farm of Chungbuk National University in 1988 and dry weight, crop growth rate(CGR) and leaf area index(LAI) were measured at the various growth stages. The results were summarized as follows : Dry weight, CGR and LAI of all varieties were increased by earlier planting and higher densities until flowering. However, they were decreased at terminal leaf stage at higher densities for Hwanggeum and Bokwang. Dry weight, CGR and LAI were increased by higher fertilizations. Hwanggeum and Bokwang were lodged at the densities higher than 40 plants/㎡ regardless of planting time. Yield reduction due to lodging was considerable at 60 plants/㎡. Paldal was highly resistant to lodging, higher fertility and drought and, therefore, adaptable to higher fertilization and density. Paldal had short petiole and narrow petiole angle, while Hwanggeum and Bokwang had long petiole and wide petiole angle. Althought number of pods were increased at earlier planting, number of empty and one-seed-pods were increased and three-seed-pods were decreased. Paldal showed higher three-seed-pod rate, althought yield was increased at earlier plantings and higher densities, Hwanggeum and Bokwang showed greater yield reduction due to lodging.

大豆에 있어서 品種, 播種期 및 栽植密度가 收量構成要素 및 收量에 미치는 影響

朴然圭 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2

Defining optimum vgetative growth is important to provide fundmental informations for the improvement of cultural practies in soybean. To provide these informations, three soybean varieties, Hwang geum, Bokwang and jang kyeong were tested at defferent planting times and sowing densities at the Experimental Farm of Chungbuk National University in 1993. Dry weight, and leaf area index(LAI) were measured at the various growth stages. The results were summarized as follows : 1. Dry weight and LAI of all varieties were increased by earlier painting and higher densities until flowering, However, They were decreased at terminal leaf stage under higher densities for all varieties. 2. All varieties were lodged at the densities higher than 40 plants/m2 regardless of planting times and yield reduction due to lodging was considerable at 60 plants/ m2. 3. Although number of pods was increased at earlier planting and higher densities, number of empty and one-Seed-pods were increased and three-seed-pods were decreased. 4. Although yield was increased at earlier planting and higher densities, yield and it's components were reduced by lodging. When severe lodging was induced there was a decreased in the number of pods per plant. 5. Dry weight and LAI at flowering were closely related with yield and the optimum LAI was estimated as 5-6.

구리 이온의 김치산패 억제작용에 관한 연구

채경연,유양자,경규항,박세원,김연순 한국조리과학회 2002 한국식품조리과학회지 Vol.18 No.1

Effect of copper ions (Cu^+ and Cu^2+) on the fermentation of kimchi, especially on their effect on the prevention of over-acidification of kimchi, was investigated. The effect of Cu^2+ ion on the growth of individual lactic acid bacterium originally isolated from kimchi was also investigated. The addition of Cu^+(≥4.0mM) or Cu^2+(≥3.0mM) ions in kimchi effectively inhibited growth of lactic acid bacteria and maintained a titratable acidity of less than 1.0% for a periods of 14 days. Leuconostoc mesenteroides significantly decreased at the 10th day of fermentation in control kimchi, whereas the group with Cu^+ and Cu^2+ showed 10^5-10^6 CFU/㎖ at the 14th day of fermentation. This indicates that the addition of Cu^+ and Cu^2+ inhibited the production of excessive acids by inhibiting lactic acid bacteria, and allowed Leu. mesenteroides stay alive longer. Fe^2+ and SO_4^2- ions did not have any effect on the fermentation of kimchi. Cu^2+ inhibited growth of all lactic acid bacteria tested, such as Leu. mesenteroides 6, Streptococcus faecalis 12, Lactobacillus plantarum 14, Lac. brevis 15, Leu. mesenteroides LA 10, and Lac. plantarum LA 97.

백서의 복강내에 투여한 Mitomycin-C-Polyglycolic acid 제형이 장기에 미치는 영향에 관한 연구

송규상,강대영,최정목,노승무,정경수,오정연,김진향,양준목,최선웅,이진호,조준식,민병무,김용백,김창식,박근성,김승영,김학용,인현빈 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

To evaluate the in-vivo effects of mitomycin-C-polyglycolic acid composite(MMC-PGA) the disk: shaped composite were implanted into the peritoneal cavity of the Sprague-Dawley rats. The pathologic changes were examined at various time points up to 12 weeks. Initially the soft tissue around the inserted disks showed capillary congestion at 3 days. Inflammatory infiltrates with foreign body giant cells appeared from the 2nd week and reached peak response at 6-8 weeks. These reaction diminished prominently at 12 weeks. No specific pathologic change was found in the liver, the kidneys, and the heart. The above results suggest that the MMC-PGA composite can serve as a new device for intraperitoneal chemotherapy of various types of cancers.

8년간(1992~1999) 산업안전보건연구원에 의뢰된 직업병 심의 사례 분석

강성규,김규상,김양호,최정근,안연순,진영우,최병순,양정선,김은아,채창호,최용휴,김대성,박정선,정호근 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2

Objectives : Pneumoconisis and noise-induced hearing loss (NIHL) have been reported as main occupational diseases by the Special Health Examination. The Industrial Accident Compensation Insurance has reported various work-related diseases, however, these two diseases occupied almost a half of compensated cases. Therefore, it was not well known about the status of occupational diseases other than pneumoconiosis, NIHL, and cardio-cerebrovascular accident (CVA). This study was conducted to analyze claimed cases as an occupational disease, that was requested to the Korea Industrial Safety and Health Agency (KOSHA). Methods : The local office of the Korea Labor Welfare Corporation (KLWC) has asked the KOSHA for confirmation of claimed cases as an occupational disease. We analyzed 379 cases requested from KLWC, the Ministry of Labor, employers, unions and occupational health agencies from 1992 to 1999. Results : Male was 80.7 % of the requested cases. Their mean age was 42 years old and 75.5 % of them were more than 35 years old. The requested cases were increased rapidly from 25 cases in 1992 to 108 cases in 1999 and the accept rate was 50.7 %. The majority of requested cases were respiratory diseases(22.4%), cancers(18.5%), Neuropsychiatric problems(14.5%), and musculoskeletal problems(13.5%). The accept rate was high in reproductive, respiratory, musculoskeletal and digestive disorders and low in neuropsychiatric, renal and otologic problems and occupational cancers. 73.6% of them were caused by chemical agents, especially 28.5 % were by organic solvents. 67% of them were clinically confirmed at university hospitals. A half of the cases were from KyongIn area, even the request came from the whole country. Conclusions : A claim was common in workers whose age was over 35 years old and exposure history was over 10 years. The respiratory diseases and neuropsychiatric disorders were still main problems in occupational health and occupational cancers was increasing even though its accept rate was not high yet.

포타슘 술포네이트 폴리스타이렌 아이오노머의 기계적인 성질에 미치는 Crown ether의 영향

나연화,조규성,이법원,김준섭,유지강,박기주 조선대학교 생산기술연구소 1999 生産技術硏究 Vol.21 No.1

The effects of crown ether on the dynamic mechanical properties of potassium sulfonated polystyrene ionomer were investigated. As expected, it was found that when crown ether molecules were added to the ionomer, the crown ether molecules interacted with K^(+) cations and weakened the ionic interaction between K^(+)/sulfonate ion pairs of the ionomer significantly. Thus, no multiplets were present, and, in turn, no clustering was found. When the ether was added to interact with 50% of K^(+) cations, weak clustering was observed: the clustering was slightly stronger than that of a 50% neutralized ionomer. From this result, it was speculated that in the 50% neutralized sample H^(+) ⇔ K^(+) cation exchange occurs rapidly between -SO₃H and -S0₃K groups in multiplets. which weakens ionic interactions. In the 50% crown ether-added sample, however, -S0₃- group, instead of -S0₃H, is present, and thus no cation exchange is expected to occur.

위 전암성 병변에 대한 내시경적 추적 관찰

김규종,박선자,남지현,임현정,김지연,박무인,구자영 고신대학교 의학부 2005 高神大學校 醫學部 論文集 Vol.20 No.1

Background: The aims of this study were to investigate the endoscopic findings of precancerous lesions of stomach and to see whether or not these lesions could progress to the carcinoma. Method: May 2000 to February 2001, consecutive patients diagnosed as having chronic active gastrits (CAG), intestinal metaplasia (IM), dysplasia, adenoma by endoscopic biopsy were enrolled. A total of 359 patients were included in this study and endoscopically followed-up to Autust 2001. Results; Among all 33 patients (26 dysplasia, 7 dysplasia with adenoma) diagnosed as dysplasia by endoscopic biopsy, there were 6 chronic erosive gastritis (CEG), 6 chronic erosion, 17 adenoma, 4 R/O cancer. On follow-up endoscopic biopsy (17 patients), there were 3 IM, 4 dysplasia, 5 adenoma, 5 carcinoma. Among all 107 patients (53 IM, 38 IM with CAG, 14 IM with CEG, 1 IM with adenoma, 1 IM with dysplasia) diagnosed as IM by endoscopic biopsy, there were 52 CEG, 33 chronic erosion, 6 local lesion, 5 adenoma, 5 R/O cancer, 3 gastric polyp, 3 atrophy with IM> On follow-up endoscopic biopsy (25 patients), there were 2 chronic gastritis, 1 CEG, 3 CAG, 14 IM 3 dysplasia, 2 adenoma, 1 carcinoma. Among all 185 patients (147 CAG, 37 CAG with IM, 1 CAG with adenoma) diagnosed as CAG by endoscopic biopsy, there were 86 CEG, 62 chronic erosion, 4 local lesion, 10 adenoma, 16 R/O cancer, 4 gastric polyp, 2 IM, 1 chronic gastritis. On follow-up endoscopic biopsy (35 patients), there were 8 chronic gastritis, 3 CEG, 14 CAG, 5 IM, 2 dysplasia, 1 adenoma, 2 arcinoma. Among All 34 patiets (22 adenoma, 8 adenoma with low grade dysplasia, 2 adenoma with moderate grade dysplasia, 2 adenoma with high grade dysplasia) diagnosed as gastric adenoma by endoscopic biospy, there were 1 local lesion, 24 adenoma, 2 R/O cancer, 7 gastric polyp. On follow-up endoscopic biopsy (17 patients), there were 2 CEG, 2 low grade dysplasia, 1 high grade dysplasia, 4 adenoma 1 adenoma with dysplasia, 4 adenoma with low grade dysplasia, 2 adenoma with high grade dysplasia, I cancerous change. Conclusions: Althought it was short period, there were some of cancerous change in precancerous lesions at follow-up endoscopy. This study suggests that screening for precancerous lesions, is one method of improving the prognosis of gastric carcinoma and when the precancerous lesions are diagnosed on endoscopy, serial endoscopic follow-up should be done to find early gastric cancer.