• Title, Summary, Keyword: EM

Search Result 2,263, Processing Time 0.039 seconds

A Study on Floating Collar of Dragged Gears (인망그물의 부양깃판에 관하여)

  • 장지원
    • Journal of the Korean Society of Fisheries and Ocean Technology
    • /
    • v.22 no.1
    • /
    • pp.1-5
    • /
    • 1986
  • In order to improve the net-mouth height of dragged gears, the authors devised models of floatingcollars of nylon cloth instead of floats and experimented with 4 types-A type (length 65em, breadth 3em), B type (length 65em, breadth 4em), C type (length 65em, breadth 5em) and D type (length 65 em, breadth 6em) attached respectively to the front edge of square of a model net after preliminary experimentation. These various types of floating collars were experimented in a circulating water channel to evaluate the characteristics of net-mouth height and hydrodynamic resistance and the effect of the length of bridles were also examined. The results obtained were as follows: 1. In case of attaching floats, the model net-mouth height reduced from 80 em to 20 em when current velocity was increased from 0.25m/see to 1m/sec. 2. In case of attaching floating collars, the model net-mouth heights were maintained 70 em, 71 em, 80 em, 78 em in maximum and 55 em, 63 em, 69 em, 73 em in minimum respectively even the current volocity was increased from 0.25 m/see to 1 m/see. 3. The model net-mouth height was reduced to 10 em maximum according to the current velocity and types of floating collars when the bridles were shortened 3~4 mm in length. 4. Hydrodynamic resistance of D type only was increased to 700 g in maximum and those of A, B, C type were reduced to 460 g in maximum at current velocity beyond 0.5 m/ see when bridles were shortened 3-4 mm in length. 5. But the model net-mouth heights became higher in accordance with breadth of floating coliars, B type was the best for this model net in case that hydrodynamic resistance was taken into account.

  • PDF

유용미생물(Effective Microorganisms ; EM)에 의한 돈육 보존의 효과

  • Han, Seung-Gwan
    • Proceedings of the Korean Society for Food Science of Animal Resources Conference
    • /
    • /
    • pp.131-134
    • /
    • 2004
  • EM이 돼지 사양에서 육질개선에 미치는 효과를 알아보기 위해 사양실험을 하였다. 일반적으로 사양한 돼지와 EM 축산사료첨가제와 EM 활성액을 정기적으로 급이하여 사양한 EM Pork를 도축한 후 각각의 돈육을 $4^{\circ}C$ 냉장온도와 $-18^{\circ}C$ 냉동온도에서 저장하였다. 그후 일반 돈육과 EM Pork의 일반성분 및 육질의 보존성에 관한 실험을 실시하였다. 단백질 변성에 관한 실험결과 일반 돈육을 5일간 냉동저장한 것은 3.72 mg%를 보였고 EM Pork는 3.2 mg%를 나타내 일반 돈육보다 15% 정도 단백질 변성을 지연시켰다. 또한, 일반 돈육을 5일간 냉장저장한 것은 4.9 mg%를 나타냈으나 EM Pork는 3.19 mg%를 나타내 일반 돈육보다 35% 단백질 변성 억제 효과를 보였다. 또한, 냉동 및 냉장 처리한 일반 돈육의 조단백질 함량은 각각 21.41%와 19.73%인데 비해 냉동 및 냉장 처리한 EM Pork는 각각 22.21%와 21.41%를 나타냈다. 이러한 결과는 단백질 변성과 관련된 것이라 볼 수 있다. 결론적으로 EM Pork육은 일반 돈육에 비해 단백질 변성 억제 효과가 15${\sim}$35% 정도 우수한 것으로 사료된다.

  • PDF

A Study on Multi-Layered EM Wave Absorber Using Natural Lacquer as a Binder

  • Choi, Dong-Han;Kim, Dong-Il;Choi, Chang-Mook;Li, Rui
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
    • /
    • v.1
    • /
    • pp.157-161
    • /
    • 2006
  • Generally, a silicone rubber and a chlorinated polyethylene(CPE) have been used as a binder for the development of high-performance composite EM(Electro Magnetic) wave absorbers. In this paper, the EM wave absorption performance of natural lacquer, which is newly proposed as a binder was investigated. The prepared MnZn ferrite EM wave absorbers are mixed with natural lacquer showed excellent EM wave absorption characteristics compared with MnZn ferrite EM wave absorbers which are mixed with the conventional binders. MnZn ferrite EM wave absorbers mixed with natural lacquer were prepared and their absorption ability was also investigated. The EM wave absorbers are fabricated in different proportions of MnZn, or NiZn ferrite and natural lacquer, and their reflection coefficients are measured. The permittivity and permeability are calculated by using the measured reflection coefficients. The EM wave absorption abilities are calculated according to different thicknesses of the EM wave absorbers.

  • PDF

A Study on Multi-Layered EM Wave Absorber Using Natural Lacquer as a Binder

  • Choi, Dong-Han;Kim, Dong-Il;Choi, Chang-Mook;Li, Rui
    • Journal of Navigation and Port Research
    • /
    • v.30 no.9
    • /
    • pp.767-772
    • /
    • 2006
  • Generally, a silicone rubber and a chlorinated polyethylene(CPE) have been used as a binder for the development of high-performance composite EM(Electro Magnetic) wave absorbers. In this paper, the EM wave absorption performance of natural lacquer, which is newly proposed as a binder was investigated. The prepared MnZn ferrite EM wave absorbers are mixed with natural lacquer showed excellent EM wave absorption characteristics compared with MnZn ferrite EM wave absorbers which are mixed with the conventional binders. MnZn ferrite EM wave absorbers mixed with natural lacquer were prepared and their absorption ability was also investigated The EM wave absorbers are fabricated in different proportions of MnZn, or NiZn ferrite and natural lacquer, and their reflection coefficients are measured. The permittivity and permeability are calculated by using the measured reflection coefficients. The EM wave absorption abilities are calculated according to different thicknesses of the EM wave absorbers.

Speedup of EM Algorithm by Binning Data for Normal Mixtures (혼합정규분포의 모수 추정에서 구간도수 EM 알고리즘의 실행 속도 개선)

  • Oh, Chang-Hyuck
    • Communications for Statistical Applications and Methods
    • /
    • v.15 no.1
    • /
    • pp.1-11
    • /
    • 2008
  • For a large data set the high computational cost of estimating the parameters of normal mixtures with the conventional EM algorithm is crucially impedimental in applying the algorithm to the areas requiring high speed computation such as real-time speech recognition. Simulations show that the binned EM algorithm, being compared to the standard one, significantly reduces the cost of computation without loss in accuracy of the final estimates.

Quality Improvement of Effective Microorganisms (EM) Pork Produced by Using EM (유용미생물(Effective Microorganisms; EM)로 사양한 EM Pork의 육질 개선 효과)

  • Han, Seung-Kwan
    • Journal of the Korean Society of Food Science and Nutrition
    • /
    • v.34 no.5
    • /
    • pp.734-737
    • /
    • 2005
  • This study was conducted to determine the effect of effective microorganism (EM) treatment in feeding system of swine on carcass characteristics. EM pork, which reared with EM additives and EM activated liquids, and conventional pork (non-EM pork) were stored at $4^{\circ}C$. Chemical composition and storage stability of EM pork were compared with conventional pork. Cholesterol content at EM pork was 71 mg/100 g, which is lower than that of conventional pork (83 mg/100 g) when the meats were stored at $4^{\circ}C$ refrigerator. And EM pork (0.165 MDA mg/kg) showed higher antioxidant effect than control pork (0.184 MDA mg/kg). And also protein denaturalization at EM pork showed lower rate $(3.19\;mg\%)$ than that of conventional pork $(4.9\;mg\%)$ when the meats were stored at $4^{\circ}C$ refrigerator, showing that inhibitory effect of protein denaturalization was increased up to $35\%$ over the conventional pork. These results show that the EM pork had superior traits in terms of cholesterol level, lipid oxidation and protein denaturalization to the conventional pork.

Accelerating the EM Algorithm through Selective Sampling for Naive Bayes Text Classifier (나이브베이즈 문서분류시스템을 위한 선택적샘플링 기반 EM 가속 알고리즘)

  • Chang Jae-Young;Kim Han-Joon
    • The KIPS Transactions:PartD
    • /
    • v.13D no.3
    • /
    • pp.369-376
    • /
    • 2006
  • This paper presents a new method of significantly improving conventional Bayesian statistical text classifier by incorporating accelerated EM(Expectation Maximization) algorithm. EM algorithm experiences a slow convergence and performance degrade in its iterative process, especially when real online-textual documents do not follow EM's assumptions. In this study, we propose a new accelerated EM algorithm with uncertainty-based selective sampling, which is simple yet has a fast convergence speed and allow to estimate a more accurate classification model on Naive Bayesian text classifier. Experiments using the popular Reuters-21578 document collection showed that the proposed algorithm effectively improves classification accuracy.

An Efficient Code Expansion from EM to SPARC Code (EM에서 SPARC 코드로 효율적인 코드 확장)

  • Oh, Se-Man;Yun, Young-Shick
    • The Transactions of the Korea Information Processing Society
    • /
    • v.4 no.10
    • /
    • pp.2596-2604
    • /
    • 1997
  • There are two kinds of backends in ACK:code generator(full-fledged backend) and code expander(fast backend). Code generators generate target code using string pattern matching and code expanders generate target code using macro expansion. ACK translates EM to SPARC code using code expander. The corresponding SPARC code sequences for a EM code are generated and then push-pop optimization is performed. But, there is the problem of maintaining hybrid stack. And code expander is not considered to passes parameters of a procedure call through register windows. The purpose of this paper is to improve SPARC code quality. We suggest a method of SPARC cod generation using EM tree. Our method is divided into two phases:EM tree building phase and code expansion phase. The EM tree building phase creates the EM tree and code expansion phase translates it into SPARC code. EM tree is designed to pass parameters of a procedure call through register windows. To remove hybrid stack, we extract an additional information from EM code. We improved many disadvantages that arise from code expander in ACK.

  • PDF

A possible application of the nonuniform electric field measurement using Pockets effect (포켈스 효과를 이용한 불평등 전계 측정)

  • Kang, W.J.;Lim, Y.S.;Choi, J.O.;Chang, Y.M.;Koo, J.Y.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.513-515
    • /
    • 2000
  • In this paper, new Partial Discharge (PD) detection technique using Pockels-cell was proposed. For this purpose, PD was generated from needle-plane electrode in air and detected by optical measuring system using Pockets cell, based on Mach-Zehnder interferometer, consisting of He-Ne laser, single mode optical fiber, 50/50 beam splitter and photo detector. We show the characteristic of the proto-type sensor for the corona discharge.

  • PDF

EM Pork의 항산화 효과 및 콜레스테롤 함량 변화

  • Han, Seung-Gwan
    • Proceedings of the Korean Society for Food Science of Animal Resources Conference
    • /
    • /
    • pp.150-153
    • /
    • 2004
  • EM과 천연항생물질을 정기적으로 급여한 돼지 사양에 대한 육질개선 효과를 알아보기 위해 일반 돈육과 EM Pork의 일반성분, 육질 개선 및 육질 보존성에 관한 실험을 실시하였다. 콜레스테롤 함량 측정 결과 일반돼지는 평균적으로 83mg/100g인데 반해 EM Pork는 71mg/100g을 나타냈는데 EM Pork가 일반돼지보다 콜레스테롤 함량이 15% 정도 감소한 효과를 보였다. 또한 TBA가는 저장기간 14일에 일반돼지가 0.184 MDAmg/kg를 나타낸 반면, EM Pork는 0.165 MDAmg/kg를 나타내 EM Pork가 일반돼지보다 11% 정도 강한 항산화 효과를 나타냈다. 단백질변성에 관한 실험결과 일반 돈육을 5일간 냉장 저장한 것은 4.9mg%을 나타냈으나 EM Pork는 3.19mg%를 나타내 일반 돈육 보다 35% 단백질 변성 억제 효과를 보였다. 결론적으로 EM Pork는 일반 돼지에 비해 콜레스테롤 함량 감소, 항산화 효과 증가 및 단백질변성 억제효과가 우수한 것으로 사료된다.

  • PDF