• Proceedings of the KIEE Conference
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• 1988.07a
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• pp.305-308
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• 1988

Pole assignment controller with variable forgetting factor is generalizaed to allow the output and/or input variance to be reduced. The algorithm can give significant reductions in variance for little extra computational effort and is presented for servo-tracking using leat-squares estimation. Moreover, the use of a variable forgetting factor with correct choice of information bound can avoid 'blowing-up' of the covariance matrix of the estimates and subsequent unstable control.

• Journal of KIISE
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• v.42 no.6
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• pp.791-800
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• 2015

In this paper, we propose the contribution-level-based opportunistic flooding in a wireless multihop network which achieves outstanding transmission efficiency and reliability. While the potential of the the predetermined relay node to fail in its receipt of broadcast packets is due to the inherent instability in wireless networks, our proposed flooding actually increases network reliability by applying the concept of opportunistic routing, whereby relay-node selection is dependent on the transmission result. Additionally, depending on the contribution level for the entire network, the proposed technique enhances transmission efficiency through priority adjustment and the removal of needless relay nodes. We use the NS-3 simulator to compare the proposed scheme with dominant pruning. The analysis results show the improved performance in both cases: by 35% compared with blind flooding from the perspective of the transmission efficiency, and by 20~70% compared to dominant pruning from the perspective of the reliability.

• Journal of the Korean Society for Railway
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• v.18 no.4
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• pp.354-362
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• 2015

Since allowable settlement of concrete slab track is about 30mm, a lot of attention must be paid to the settlement of the earthwork (reinforced trackbed, upper subgrade, under subgrade) under the concrete track. To this end, more experimental data should be accumulated through tests for these materials. In this study, we evaluate the long-term settlement of reinforced trackbed and subgrade materials using factors such as repeated loading conditions, water content, and grain size distributions in a large triaxial test and a large oedometer test. In cases in which the performance of the reinforced trackbed layer meets the design criteria, the settlement caused by train load was considerably small. But, when the water content increases in the subgrade, unexpectedly large settlement might occur for certain grain size distributions of the subgrade materials.

• Journal of the Economic Geographical Society of Korea
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• v.8 no.1
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• pp.153-169
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• 2005

In this study, we analysed the state of the fisheries in Chungnam around 1910 from Hangook Susanji. As a result, there were about 30 ports in the west coast area in Chungnam, and we can classify their locations into 5 types Type I is located in small and mid sized rivers. Type II is located in a costal port. Type III is ports facing the open sea, and type IV is ports in a bay. Type V is ports on islands of coast. Species of fish are porges, mackerels, sting rays, croakers, hairtails, shrimps, etc. The base of fishing porge was Jukdo and Yeondo. The fishing banks of croakers are formed from Chilsantan, Jeonlado to the area of seashore, Chungnam. Hairtails were caught near all the areas of seashore. Salt manufacturing is done near all coasts of Chungnam, Seocheon-bay, Ungcheon-bay, Ocheon-bay, Anmyeon island, Taean, Dangjin area, etc represent this work. Especially, the salt which was produced in Taeangun was so famous that it was called ' Taeansalt'. In the Kum-river area there were 32 fishing villages. Freshwater fish were caught in the upper stream area and the mouth of Geumgang, down stream, was the center for producing Baengeo. There were 23 fishing villages, and the species consisted of croaker, hairtail, Forge, gray mullet, sting ray, sharks, anchovy, shrimps, etc in Biin-bay. The coast of Boryeong had about 33 fishing villages, but their fishing industry was not developed more than their good salt manufacturing. Though there are records that Chunsu-bay had 28 fishing villages, Taean peninsula and Garolim-bay had about 70 fishing villages, and Asan-bay area had about 55 fishing villages, they were developed a little, but not more than Weir fisheries or salt manufacture on the base of salt area and the tideland because these areas were just for farming. South of Anmyeon island of West coast island areas is the biggest area of Stow nets on stakes fishing and the island areas down mouth of Kum river were centers for producing porge.

• Journal of Life Science
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• v.25 no.11
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• pp.1280-1289
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• 2015

Fish-meat gel is being produced mostly relying on surimi and raw materials imported from Southeast Asia and North America and present in small amount in local markets. In this study, common farmed local fishes were examined as stable and reliable sources of surimi for fish-meat gel production. For testing, five main farmed-fish of Korea, namely; Bastard halibut (Paralichthys olivaceus), Red sea bream (Pagrus major), Korean rockfish (Sebastes schlegeli), Common mulle (Mugil cephalus), and Finespotted flounder (Pleuronichthys cornutus) were used following a traditional washing process. The quality of the surimi was determined by the values of water content, whiteness index, gel strength and impurity. Accordingly, fish-meat gel and surimi quality experiments were carried out by measuring compressive and texture properties, expressible moisture content, Hunter color scale values and SDS-page protein patterns. Also gel characteristics were compared with that of FA and RA grade surimi (Alaska Pollock). Fish-meat gels were prepared by salt mincing the farmed-fish surimi with NaCl (2% w/w) and moisture adjustment to 84% by ice water adding. Prepared fish-meat paste was filled into 20-25 cm long polyvinylidene chloride casings and heated at 90℃ for 20 min. The whiteness values of fish-meat gels produced from surimi were increased by using farmed-fish and became comparable to that of FA Alaska Pollock gel. Among all tested farmed-fish, P. olivaceus and P. major exhibited better properties than RA Alaska Pollock and similar properties to FA Alaska Pollock. Therefore, current data suggests that fish farming can be an efficient and sustainable fish-meat source for fish-meat gel production in Korea.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1996.04a
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• pp.245-245
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• 1996

(중략) 금번 조사한 양서류 이상의 고등동물에 있어서는 rat를 제외하고 Mt에 있어서의 26-수산화활성이 Ms에서 보다 높았으며, 그 입체 배치도 25R체가 우세하게 생성되었다. 종래, 이 동물종의 연구에 주되게 쓰여져 왔던 rat가 예외적인 존재였다. 한편, 어류에 있어서는 그 결과가 다른 동물종과 큰 차이가 있었다. 즉, 잉어는 Ms의 활성이 Mt에 비해 압도적으로 높았으며 25R체가 대부분 생성되었다. 도미는 어느 fraction에서도 25S체가 극미량밖에 생성되지 않았으며, 송어의 경우 26-수산화활성은 검출되지 않았다. 여기서 송어의 담즙주성분은 cholic acid이며, 이 동물의 경우에는 통상과는 다른 담즙산 생합성경로의 가능성이 시사되었다.

• KLA journal
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• v.10 no.9
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• pp.10-17
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• 1969

이 글은 1959년 도미 이후 현재까지 10여년간 미국에 체재하면서 미국 도서관계에서 많은 활약을 하고 계신 우리나라의 유일한 도서관학 박사이신 김중한 박사께서 지난 5월 국제회의에 참석차 잠시 귀국하여 고국의 관계를 보고 돌아 가신 후 고국의 도서관계가 보다 더 바람직한 내일이 건설되기를 염원하는 뜻으로 집필해 주신 글이다. 다만 현실적으로 아직 실현 시키기에 어려운 것도 없지 않다. 그러나 근대화의 걸음을 재촉하여 총력적인 작업을 추진하고 있는 우리 나라가 급진적으로 사회현상이 발전해 가고 전문화되어 감에 따라 사회가 도서관에 대한 인식이 성열되고 보다 더 적극적인 요구가 부원간 도래할 것이라고 하는 신념을 갖고 있는 우리들에게 새로운 진로가 될 수 있는 좋은 제언이라고 생각한다. 따라서 이 글이 팔자인 김박사께서도 서두에서 밝힌 바와 같이 한국의 도서관 발전 장기계획을 수립하는 데 있어서 대화의 테마와 한 아이디어로 제시하고 있는 만큼 충분하고 객관적인 분석 비판 검토와 연구가 있어야 할 것으로 믿으며, 항상 고국의 관계 발전과 성장을 위해 염려와 격려를 아끼지 않으시는 필자에게 애심으로 감사를 드리는 바이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05b
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• pp.1285-1288
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• 2003

인터넷 기술의 발전에 따라 무선 인터넷 환경에서의 서비스 이용이 활발해지고 있으며, 향후 무선인터넷의 고속화 및 서비스 수용능력의 신장은 이를 보다 가속화시킨 것이다. 그러나, 무선랜에서 사용자가 서비스 사용 중 이동할 경우 핸드오프 수행은 멀티미디어 서비스 및 음성 서비스를 제공하는데 있어서 지연 또는 데이터 손실을 가져오는 주 요인이 되고 있다. 따라서, 본 논문에서는 무선랜에서 사용하는 기존 핸드오프 기법에 대해서 설명하고, Preauthentication과 데이터의 우선순위를 기반으로 핸드오프를 신속하게 수행하기 위한 기법을 제안함으로서, 향후 고속화된 무선인터넷 환경에서 사용자의 통신간 이동을 고려시 실시간 서비스 사용 중에 일어날 수 있는 데이터의 손실 또는 지연으로 인한 서비스 품질 저하를 효율적으로 방지해 보고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11a
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• pp.481-484
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• 2003

본 논문에서는 문법 규칙과 어절 상관도를 이용한 품사 태깅 시스템을 제안한다. 원시 말뭉치와 품사태그 부착 말뭉치에서 중의 어절(ambiguity eojeol)의 앞뒤 어휘와 품사 정보를 파악하여 문법 규칙을 마련하였으며, 한국어의 품사와 문장성분적 요소를 고려한 7개의 어절 태그를 설정하여 이 어절 태그간의 확률값을 이용해 어절간의 상관도를 구하였다. 이러한 방법들을 이용하여 품사 태깅을 실험한 결과, 150 만 어절의 학습 말뭉치와 3 만 어절의 실험 말뭉치에서 각각 평균 92%와 91%의 정확률을 보였다.

• Proceedings of the KIEE Conference
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• 1990.07a
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• pp.514-517
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• 1990

In this paper, compliant motion control of a manipualator in manipulator is proposed by using the self-tuning adaptive controller. Compliant motion is needed in order to applicated to complicated and accurate fields such as assembly operation in which several parts are matched. For a control method of compliant motion hybrid control is used so forces and position control are proposed selectively through a closed feedback loop. By contacting with environment, the uncertainties higher. Self-tuning controller which adapts to variable dynamic response is applied to compliant motion control in order to satisfy the desired operation. The applicability of the suggested algorithm was confined by simulation of the contour tracking task of four joint manipulator.