• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1986.06a
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• pp.10-20
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• 1986

I. 윤활기유 제조시설소개 개요 1) 고급 윤활기유(HVI)생산공장으로서 그간 수입에만 의존하던 최고급 품질의 기유를 국내 수요업체에 안정공급 2) 세계 최신 공정인 Gulf Lube Oil Hydrotreating Process Type III (수소첨가 개질공정)채택 3) 국내 최초일뿐 아니라, 세계에서도 일본, 카낟에 이어 3번째로 건설 1. 고품질 제품 생산-고점도 지수, 산화안정성 및 열안정성 우수, 잔류탄소분, 윤황분, 질소분 극소, 방향족 성분 및 회분 극소, 색상 양호 2. 첨가제(특히 산화방지제 및 점도 지수 향상제)사용효과 상승으로 완제품 생산시 생산비 감소 3. 동일 VI 제품 생산기준 수율이 높음 - Hydrocarbon Structure 변화로 원료 유중 부적합성분의 윤활기유화 4. Severity 조절로 Production Mode 변경 용이 5. 양질의 부산물 생산 - HDT Naphtha, Middle distillate 6. 용제 추출기유는 원유종류 및 성상에 따라 제품특성이 결정되나, 사용가능 원유가 다양 하면서도 제품특성 및 품질이 일정함.

• KOREAN POULTRY JOURNAL
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• v.3 no.7 s.21
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• pp.58-63
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• 1971

국내에서 생산되는 배합사료의 품질을 비교하기 위하여 1969년부터 3년간 전국에서 323점의 배합사료 샘플을 수집하여 일반 조성분 및 칼슘인 함량을 분석해 본 결과 다음과 같은 결론을 얻었다. (1) 모든 성분에 있어서 같은 사료라도 제조하는 회사에 따라 그 함량의 변이가 심하며 산란사료의 경우에는 생산하는 종류의 계열화가 필요하다고 생각된다. (2) 수분 함량은 대개의 경우 13$\%$이하이나 일부 15$\%$ 이상으로 높은 것도 있었다. 조단백질 함량이 지나치게 높은것도 있었으나 다소 부족한 감이 있는 것도 상당수에 달했으며 대체로 조섬유 함량은 허용범위내에 들어갔으나 더러는 공정규격의 상한치를 넘는 것도 있었다. 산란계 사료에 있어서 조회분 함량과 Ca의 함량을 상관시켜 보면 공정규격 상한치의 제조정이 요청된다. (3) 초생추, 중추 및 대추 사료에 있어서는 Ca함량이 1.2$\%$이상인 것이 많았고 산란계 사료에 있어서는 2.75$\%$이하인 것이 상당수 있어서 앞으로 칼슘의 함량조절에 크게 주의를 해야 된 것 같다. 이런 점에서 보면 유통되는 패분의 선택에 신경을 써야 할것으로 본다.

• Journal of Energy Engineering
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• v.2 no.1
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• pp.68-74
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• 1993

In order to maximize the utility of vacuum residue, supercritical solvent extraction technique where n-pentane was used as a supercritical solvent was applied to obtain deasphalted oil from vacuum residue. Oil-extraction yield at various temperatures and pressures and the contents of metal complex and sulfur of extracted oil were investigated. In supercritical state, extraction yield of deasphalted oil was found to be strongly dependent on the n-pentane density, and the metal complex content of extracted oil was effectively lowered when compared with that of vacuum residue. However, the sulfur content of extracted oil showed little difference when compared with that of vacuum residue.

• Proceedings of the KIPE Conference
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• 2013.07a
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• pp.435-436
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• 2013

본 논문에서는 효율 개선을 위하여 변압기를 구비하지 않은 계통 연계형 전력변환장치에서의 직류분(DC offset) 검출에 대하여 알아본다. 변압기를 사용하지 않음으로써, 교류 출력에 직류 성분이 혼입하여 계통에 유입되는 경우 직류 성분이 주상변압기 등에 편자 현상 등으로 계통이나 다른 수용가 설비에 고장을 일으킨다. 스위칭 등의 이상에 따른 직류가 계통에 유출되는 것을 시뮬레이션을 통하여 확인해 보고 직류 검출하는 방법을 확인하도록 한다.

• Proceedings of the Korea Institute of Convergence Signal Processing
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• 2000.08a
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• pp.325-328
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• 2000

텍스쳐 분석은 장면 분할, 물체 인식, 모양과 깊이 인식 등의 많은 영상 처리 분야에서 중요한 기술 중의 하나이다. 그러나 실영상에 포함된 다양한 텍스쳐 성분에 대해서 보편적으로 적용 가능한 효율적인 방법들에 대한 연구는 미흡한 실정이다. 본 논문에서는 텍스쳐 인식을 위해서 비교사 학습 방법에 기반 한 효율적인 텍스쳐 분석 기법을 제안한다. 제안된 방법은 텍스쳐 영상이 지닌 방향특징 정보로서 각(angle)과 강도(power)를 추출하여 자기 조직화 신경회로망에 의해서 블록기반으로 군집화(clustering)된다. 비교사적 군집 결과는 통합(merging)과 불림(dilation) 과정을 통해서 영상에 내재된 텍스쳐 성분의 분할을 수행한다. 제안된 시스템의 성능 평가를 위해서는 다양한 형태의 다중 텍스쳐 영상을 생성하여 적용한 후 그 유효성을 보인다.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.3
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• pp.165-172
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• 2001

Owing to raising number of livestock, we have a problem to solve disposal of livestock manure. We know that soil have the digestion ability of livestock manure as one of multifunctionality. I carried out to investigate of livestock manure digestion (especially pig and chicken manure) that is considered as nitrogen fertilizer in upland crops. The results were summarized as follows: 1. The amount of pig manure was(1999) 4,592,375 tons/year, and chicken manure was 4,488,166 tons/year and equivalent to 41,912 tons N/year and 76,223 tons N/year, respectively. 2. The definition of the digestion ability of livestock manure is as the maximum application amount of livestock manure without injuring soil and plant. And the calculation model of digestion ability of livestock manure(ALMD) is follows: ALMD = amount of nitrogen requirement per each upland crop / {(total nitrogen contents in livestock manure) ${\times}$ (nitrogen fertilizer efficiency of livestock manure)} 3. The amount of ability of pig and chicken manure for upland crops (dry based) were 1,142.9kg/10a and 540.1kg/10a, respectively. 4. The order of amount of digestion ability of livestock manure on upland were vegetables > orchards > miscellaneous grains(corn) > barley > potatoes > pulses > oil seeds & special crops ) fodder crops) mulberry.

• Journal of Advanced Navigation Technology
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• v.20 no.6
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• pp.625-630
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• 2016

Recently, various types of image contents are being produced, and interest in copyright protection technology is increasing. In this paper, we propose an image encryption technology for color images. This technique divides the image into RGB color components and then performs quad-tree decomposition based on the edge of image. After the quad-tree partitioning, encryption is performed on the selected blocks. Encryption is performed on color components to measure encryption efficiency, and encryption efficiency is measured even after reconstitution into a color image. The encryption efficiency uses a visual measurement method and an objective image quality evaluation method. The PSNR values were measured as 7~10 dB for color difference components and 16~19 dB for color images. The proposed image encryption technology will be used to protect copyright of various digital image contents in the future.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.1B
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• pp.156-166
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• 2000

A rate-distortion based segmentation using recursive merging is presented, which considers texture as a homogeneity by adopting the procedure of a generalized texture approximation. The texture in a region is approximated by SA-DCT and a set of two uniform quantizers with fixed step sizes, one for DC and another for AC. Using the approximated texture, we calculated the rate-distortion based cost. The segmentation using recursive merging is performed by using the rate-distortion based cost. Experimental results for 256$\times$256 Lena show that the region-based coding using the proposed segmentation yields the PSNR improvements of 0.8~ 1.0 dB and 1.2~1.5 dB over that using the rate-distortion based segmentation with DC approximation only and JPEG, respectively.

• Food Science of Animal Resources
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• v.23 no.2
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• pp.168-171
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• 2003

The study was conducted to investigate the antioxidative effect of various extracted propolis. After addition of those extracts to soybean oil at the same level, their antioxidative effects were compared by Rancimat test. The control without added antioxidant showed the shortest Antioxidative Index(AI). The AI of the general Water Extracted Propolis(GWEP) and boiling WEP(BWEP) added to soybean oil were 4.51 and 5.02, respectively. The oxidation period in the BWEP was longer than the ascorbic acid and the GWEP. This result indicated that BWEP had more antioxidative effect than GWEP.

• Journal of the Korean Wood Science and Technology
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• v.6 no.1
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• pp.3-7
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• 1978

Quercus serrata degraded by Leminus edodes(berk) Singer was investigated. In order to evaluate on affect of the fungi on the sound logs, and the logs attacted for 2 years and five years were used as a sample tree. Large portions of carbohydrate mainly was decomposed by the fungy. It is supported by the increasing of alkaline extractives and the breaking up of crystallinity. Lignin is transformed considerably as shown the results of the determination of Klason lignin, gel filtration and nitrobezene oxidation. On the other hand, the decreasing of methoxyl group and the increasing of carboxyl group in parallel with demethlation and acidification are presented. Syringyl nuclei unit is decomposed easier than guaiacyl unit. It is also illustrated that the more decreasing of carboxyl group compared with aldehyde group was acidified biodegradation.