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이근상,김현태,Lee, Kun-Sang,Kim, Hyun-Tae 대한자원환경지질학회 2011 자원환경지질 Vol.44 No.2
본 연구에서는 포괄적 역학모델을 이용하여 석유 생산 시스템의 파이프 내 가스-오일 2상유동에 대한 유동패턴을 결정하였다. 2상의 유체는 운영 인자, 기하학적 변수, 유체 물성 등에 따라 특정의 유동패턴을 나타냈다. 광범위한 기액 겉보기 속도에 대하여 시스템의 인자들을 변화시키면서 유동패턴을 비교하였다. 다양한 인자들 중 경사각과 겉보기 속도가 파이프 내 가스-오일 2상유동의 유용패턴을 결정하는데 가장 지배적인 인자로 나타났다. 파이프 직경, 유체 물성 등의 인자들은 전이 경계선 부근을 제외하면 유동패턴 변화에 제한적인 영향 만을 미쳤다. 역학모델은 실험실 평가나 신뢰성있는 상관식 이용이 불가능할 때 유동패턴을 결정할 수 있는 유용한 도구이다. A comprehensive mechanistic model has been used to determine the flow pattern for gas-oil two-phase flow in pipes of petroleum production system. Depending on operational parameters, geometrical variables, and physical properties of the two phases, the two phases shows a specific flow patterns. For different parameters of the system, How pattern were compared for wide range of superficial velocities of oil and gas. In a variety of parameters, the inclinational angle and superficial velocities of oil and gas are the most dominant factors in determining the flow patterns for two-phase flow in pipelines. Other parameters such as pipe diameter and fluid properties have a limited effect on the change of flow patterns except for near transition. The mechanistic model is shown to be useful to determine the flow pattern in situations where either an experimental evaluation in a laboratory or reliable correlations are not available.
능동 소음 제어를 위한 새로운 가변 수렴 상수 Gradient Adaptive Lattice Algorithm
이근상,김성우,임재풍,서영수,박영철,Lee, Keunsang,Kim, Seong-Woo,Im, Jaepoong,Seo, Young-Soo,Park, Youngcheol 한국음향학회 2014 韓國音響學會誌 Vol.33 No.5
본 논문은 능동 소음 제어 시스템에 적합한 새로운 가변 수렴 상수 filtered-x gradient adaptive lattice(NVSS-FxGAL) 알고리즘을 제안한다. Gradient adaptive lattice(GAL) 알고리즘은 협대역 특성을 가지는 소음을 효과적으로 제어할 수 있다. GAL 알고리즘의 수렴 성능을 개선하기 위한 가변 격자 필터의 각 단계에 동일하게 적용하면 입력 신호의 특성 변화에 강인하게 대처하지 못한다. 제안 알고리즘은 격자 필터의 각 단계에 적합한 로컬 가변 수렴상수를 이용하여 안정적이고 일관성 있는 수렴 성능을 보장한다. 실험을 통해 제안 알고리즘은 빠른 수렴 속도와 낮은 정상 상태를 보임을 확인하였다. In this paper, a novel variable step-size filtered-x gradient adaptive lattice (NVSS-FxGAL) algorithm for active noise control system is proposed. The gradient adaptive lattice (GAL) algorithm is capable of controlling the narrow band noise effectively. The GAL algorithm can achieve both fast convergence rate and low steady-state level using the variable step-size. However, it suffers from the convergence performance for varying signal characteristic since the global variable step-size is equally applied to all lattice stages. Therefore, the proposed algorithm guarantees the stable and consistency convergence performance by using the local variable step-size for the suitable each lattice stage. Simulation results confirm that the proposed algorithm can obtain the fast convergence rate and low steady-state level compared to the conventional algorithms.
한우와 샤로레교잡에 의한 신종한우육성 연구 2 . 사양형태별 한우와 샤로레 1 대잡종 발육과 번식능력 비교
이근상,나기준,김희석,윤철준 ( K . S . Lee,K . J . Na,H . S . Kim,C . J . Yun ) 한국축산학회 1985 한국축산학회지 Vol.27 No.4
This study was carried out to investigate the growth rate, the age and body weight at puberty during the growing period in Korean native cattle (K) and Charolais crossbreed (CK). 14 Korean native bulls or heifers and 14 CK were alloted to two nutritional levels (Standard level and Low level groups based on the NRC) during the experimental period. The growth rate of CK was 28%-55% faster n bulls and 33%-26% in heifers than that of K (P$lt;0.01). The feed efficiency of CK was 6%-10% less in bulls and 12%-8% in heifers than that of K. The dressing percent was 60.5-61.9% in CK and 56.7-59.9% in K. The age at puberty was different between regimes (P$lt;0.05) and the average body weight at puberty was the same between breeds (P$lt;0.05).
이근상 ( Geun Sang Lee ),김기정 ( Ki Jeong Kim ),김형준 ( Hyoung Jun Kim ) 한국지리정보학회 2013 한국지리정보학회지 Vol.16 No.3
This study developed the algorithm of location-based service for supplying the efficient tourism service to traveller using mobile device and applied it to the Jeonju HANOK village. First, the location service was advanced using algorithm coupling with GPS error range and travel speed in single line, and with GPS location and nearest neighbor method to line in multiple one. Also this study developed a program using DuraMap-Xr spatial engine for establishing topology to Node and Link in line automatically. And the foundation was prepared for improving travel convenience by programming location-based service technology to single and multiple lines based on Blackpoint-Xr mobile application engine.
한우 육성 및 비육기 영양수준이 발육 , 사료이용성 및 도체 조성에 미치는 영향
김강식(K . S . Kim),신기준(K . J . Shin),백봉현(B . H . Paek),김용곤(Y . G . Kim),이근상(G . S . Lee),권순기(S . K . Kwon) 한국축산학회 1987 한국축산학회지 Vol.29 No.4
To evaluate the effect of feeding level on daily gain, feed efficiency and carcass composition, high (H: DCP and TDN was supplied for 1.1㎏ daily gain × 1.1) and low (L: DCP and TDN was supplied for 0.6㎏ daily gain × 1.1) level nutrient were fed to each 12 heads of Korean native bulls (KNB) for the 1st period (body weight from about 120㎏ to 300㎏), and thereafter during 2nd period 12 heads were devided into two groups and fed with H and L-feeding level until animals weighted about 500㎏. 1. Daily gain was significantly increased (P$lt;0.05) and the feeding period was significantly decreased when fed with H level. Shifting feeding level (H→L or L→H) did not affect the daily gain during whole period although there was a trend that H level during 1st period was more efficient than L level. 2. Dry matter intake was higher with H level than with L level. 3. DCP efficiency was better when fed with L level. The efficiency of L→H level was lower than that of H→L level during whole period but was better than that of H→H level during the early phase of 2nd period. 4. TDN efficiency was not influenced by the feeding level. However, TDN efficiency of H group was slightly better than that of L group during the 1st period. 5. Dressing percentage was significantly increased when fed with H level during the 2nd period. Fat content was significantly increased when fed with H→H level, while there was no significant differences among H→L, L→H, L→L feeding levels. There was no significant differences in retailed cuts between the feeding levels. 6. Carcass price was higher and feed cost was lower when fed with L level during the 2nd period. The monthly income per head was higher when fed with H level during the 1st period, although there was no big differences between H→H and L→H feeding level.
이근상 ( Geun Sang Lee ),김태근 ( Tae Keun Kim ) 한국지리정보학회 2012 한국지리정보학회지 Vol.15 No.3
The agricultural area was classified into dry and paddy fields in this study using the near-infrared band of Landsat TM to extract land cover classes that need to the application of Expected Mean Concentration (EMC) in nonpoint source works. The accuracy of image classification of the land cover map from Landsat TM image showed 83.61% and 78.41% respectively by comparing with the large and middle scale land cover map of Ministry of Environment. As the result of Soil Conservation Service (SCS) Curve Number (CN) using the land cover map from image classification, Dongbok dam and Dongbok stream basin were analyzed high, Also Geymbaek water-gage and Bosunggang upstream basin showed high in the analysis of EMC of BOD, TN, TP by basin, And also Geymbaek water-gage and Bosunggang upstream basin showed high in the analysis of non-point source through coupling with direct runoff, Therefore these basins were selected with the main area for the management of nonpoint source.