• Title/Summary/Keyword: Time utilization

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An Enhanced Finite-Settling-Step Direct Torque and Flux Control (FSS-DTFC) for IPMSM Drives

  • Kim, Sehwan;Seok, Jul-Ki
    • Journal of Power Electronics
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    • v.16 no.4
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    • pp.1367-1374
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    • 2016
  • This paper presents a discrete-time version of voltage and current limited operation using an enhanced direct torque and flux control method for interior permanent magnet synchronous motor (IPMSM) drives. A command voltage vector for airgap torque and stator flux regulation can be uniquely determined by the finite-settling-step direct torque and flux control (FSS-DTFC) algorithm under physical constraints. The proposed command voltage vector trajectories can be developed to achieve the maximum inverter voltage utilization for the discrete-time current limit (DTCL)-based FSS-DTFC. The algorithm can produce adequate results over a number of the potential secondary upsets found in the steady-state current limit (SSCL)-based DTFC. The fast changes in the torque and stator flux linkage improve the dynamic responses significantly over a wide constant-power operating region. The control strategy was evaluated on a 900W IPMSM in both simulations and experiments.

Ozonation of Reactive Dyes and Control of THM Formation Potentials (오존산화에 의한 반응성염료의 제거 및 THM생성능의 제어)

  • 한명호;김범수;허만우
    • Textile Coloration and Finishing
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    • v.16 no.2
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    • pp.34-40
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    • 2004
  • This study was conducted to remove the reactive dyes by the Ozone demand flask method which are one of the main pollutants in dye wastewater, Ozone oxidation of three kinds of the reactive dyes was examined to investigate the reactivity of dyes with ozone, Trihalomethane formation potentials(THMFPs), competition reaction and ozone utilization on various conditions for single- and multi-solute dye solution. Concentration of dyes was decreased continuously with increasing ozone dosage in the single-solute dye solutions. THMFPs per unit dye concentration were gradually increased with increase of ozone dosage. By the result of THMFPs change with reaction time, THMFPs were rapidly decreased within 1 minute in single-solute dye solutions. Dey were increased after 1 minute of reaction time, and then they were consistently decreased again after longer reaction time. Competition quotient values were calculated to investigate the preferential oxidation of individual dyes in multi-solute dye solutions. Competition quotients$(CQ_i)$ and values of the overall utilization efficiency, no$_3$, were increased at 40mg/1 of ozone dosage in multi-solute dye solutions.

Effective IPTV Channel Control Algorithm Supporting Smooth Channel Zapping (원활한 채널 변경을 지원하는 효율적인 IPTV 채널 관리 알고리즘)

  • Joo, Hyun-Chul;Song, Hwang-Jun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.35 no.3B
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    • pp.390-397
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    • 2010
  • This paper presents an effective IPTV channel control algorithm considering network utilization and channel zapping time. The proposed algorithm keeps maximum average channel zapping time of each subscriber in the tolerable range with low network bandwidth usage by adjusting the type of each channel and the number of additional intra frames inserted into each channel. Finally, experimental results are provided to show the performance of the proposed algorithm.

A Full Utilization of Space-time Block Code in Cooperative Communications (협력 통신에서 시공간부호의 최대 사용 효율)

  • Tin, Luu Quoc;Kong, Hyung-Yun
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.33 no.2A
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    • pp.115-120
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    • 2008
  • We propose a cooperative transmission scheme that uses Hurwitz-Radon space-time code for the relays which help the source to transmit signals to the destination, the full utilization here is that the destination utilizes the broadcast symbols from the source. We present the 2 transmit antennas case in detail because of its simplicity and high data rate. Analysis and simulations show that the proposed scheme achieves full diversity order of 3. The maximum likelihood receiver is also derived and the combining scheme is shown to be very simple.

Quality Adaptation of Intra-only Coded Video Transmission over Wireless Networks

  • Shu Tang;Yuanhong Deng;Peng Yang
    • Journal of Information Processing Systems
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    • v.19 no.6
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    • pp.817-829
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    • 2023
  • Variable wireless channel is a big challenge for real-time video applications, and the rate adaptation of realtime video streaming becomes a hot topic. Intra-video coding is important for high-quality video communication and industrial video applications. In this paper, we proposed a novel adaptive scheme for real-time video transmission with intra-only coding over a wireless network. The key idea of this scheme is to estimate the instantaneous remaining capacity of the network to adjust the quality of the next several video frames, which not only can keep low queuing delay and ensure video quality, but also can respond to bandwidth changes quickly. We compare our scheme with three different schemes in the video transmission system. The experimental results show that our scheme has higher bandwidth utilization and faster bandwidth change response, while maintaining low queuing delay.

Flame Retardancy of Wood Products by Spreading Concentration and Impregnation Time of Flame Retardant (방염제의 도포량과 침지시간 차이에 따른 목재제품의 방염성능)

  • PARK, Sohyun;HAN, Yeonjung;SON, Dong Won
    • Journal of the Korean Wood Science and Technology
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    • v.48 no.4
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    • pp.417-430
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    • 2020
  • The flame retardancy, such as carbonized length and area, of four plank type wood products by the spreading concentration and impregnation time of flame retardant were measured according to standard of the Nation Fire Agency in Republic of Korea. To measure the flame retardancy, Korean pine plywood, Japanese larch plywood, Japanese cypress planks, and perforated birch plywood boards were treated with self-development flame retardant by 300 and 500 g/㎡ spreading concentration and those were compared with control specimen. In general, the flame retardant performance of wood products improved as the spreading concentration of flame retardant increased. Except for Japanese larch plywood, there was no significant difference in the flame retardant performance by the spreading concentration. The flame retardant performance of perforated birch plywood board was positively correlated up to 60 minutes of impregnation time, but then gradually decreased. These results about the flame retardancy of wood products by spreading concentration and impregnation time were expected to be basic data for improving flame-retardant treated wood.

Assessment of frozen storage duration effect on quality characteristics of various horse muscles

  • Seong, Pil Nam;Seo, Hyun Woo;Kim, Jin-Hyoung;Kang, Geun Ho;Cho, Soo-Hyun;Chae, Hyun Seok;Park, Beom Young;Ba, Hoa Van
    • Asian-Australasian Journal of Animal Sciences
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    • v.30 no.12
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    • pp.1756-1763
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    • 2017
  • Objective: The study aimed at assessing the effects of frozen storage duration on quality characteristics, lipid oxidation and sensory quality of various horse muscles. Methods: Five representative muscles: longissimus dorsi (LD), gluteus medius (GM), semimembranosus (SM), biceps femoris (BF), and triceps brachii (TB) at 24 h post-mortem obtained from 28-mo-old Jeju female breed horses (n = 8) were used in the present investigation. The muscles were vacuumpackaged and frozen at $-20^{\circ}C$ for 120, 240, and 360 days. All the samples were analyzed for thawing and cooking losses, pH, Warner-Bratzler shear forces (WBSF), color traits, total volatile basic nitrogen (TVBN), thiobarbituric acid reactive substances (TBARS) and sensory traits. The muscle samples analyzed on day 0 of frozen storage (fresh, non-frozen) were used for comparison. Results: Results revealed that thawing and cooking losses significantly (p<0.05) increased in all the muscles after 120 days and then remained unchanged up to 360 days of frozen storage. The TBARS and TVBN contents significantly increased as increasing frozen storage time up to 360 days (p<0.05). While, significant decreases in WBSF values were observed for all the muscles with increased frozen storage time (p<0.05). Frozen storage variously affected the color traits of the muscles for instance; the redness of LD, GM, and BF muscles showed a decreasing tendency during frozen storage while it was not changed in TB and SM muscles. Furthermore, the frozen storage did not produce detrimental effects on sensory quality as it did not cause flavor and juiciness defects whereas it partially improved the tenderness of all the muscles studied. Conclusion: Based on the results obtained from our work, it is concluded that frozen storage could be applied to increase the long-term shelf life of horsemeat while still retaining its sensory quality.

Food culture research of Gwangju and Chollanamdo area(II) - In Particular Food - (광주와 전라남도의 음식문화 연구(II) - 특별음식 -)

  • 김경애;정난희;전은례
    • Journal of the Korean Home Economics Association
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    • v.41 no.3
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    • pp.181-196
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    • 2003
  • Investigated kinds and utilization frequency for traditional food and Particular food to systematize Gwangju city and Chollanamdo area traditional food culture. Awareness for traditional food had pride because taste is various, and did that must use much when was festive day. Investigation subject were feeling necessity about accession, development of traditional food, and manufacture of traditional food, succession did that must take charge in home. Characteristic of taste for Gwangju city, Chollanamdo food was deep taste. Difference between variable was significant that age, religion that have pride about traditional food, attainments in scholarship, monthly income that used time much traditional food, degree that give from traditional food to snack is age, attainments in scholarship, years of married life, religion, reason that give snack to traditional food is daughter-in-law order, kind of traditional food that give to snack is age, monthly income mouth, opinion about accession and development of traditional food is age, religion, daughter-in-law order, reason that must inherit and develop traditional food is attainments in scholarship, time that eat much traditional food is attainments in scholarship, a person, medium that learn cuisine of traditional food is age, opportunity that is been interested to traditional food is age, attainments in scholarship, years of married life. By utilization rate of food-tasting food subdivisions of the season, used much by rice-cake soup, fermented rice punch, order of cake made from glutinous rice New Year's Day, by herbs, Gimgui, Ogokbap's order January Full Moon Day on the lunar calendar. By a cake made in the shape of a flower, azalea honeyed juice mixed with fruits as a punch order to Samjitnal, by beans panbroiling, dropwort raw order Buddha's Birthday, Tano Festival uses Charyunbyeong and used Tteoksudan in Yudu and used much by young chicken soup with ginseng and other fruits, watermelon order period of midsummer heat. Used songpyon and fermented rice punch in Full-moon Harvest Day, and Junggujeol used Chrysanthemum griddle cakes made in flower Pattern, and red-bean gruel taken on the winter solstice, and Nappyeongjeolsik was utilizing Goldongban. Pyebaek food utilization ratio was high the utilization rate by chestnut, jujube, chicken, wine order. The contributiveness food utilization rate was high the utilization rate by rice cake, dried croaker, fruit, oil-and-honey pastry order. The large table food utilization rate was high the utilization rate by fermented rice punch, fruit, steamed short-ribs order.

A Real-time Dynamic Storage Allocation Algorithm Supporting Various Allocation Policies (다양한 할당 정책을 지원하는 실시간 동적 메모리 할당 알고리즘)

  • 정성무
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.10B
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    • pp.1648-1664
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    • 2000
  • This paper proposes a real-time dynamic storage allocation algorithm QSHF(quick-segregated-half-fit) that provides various memory allocation policies. that manages a free block list per each word size for memory requests of small size good(segregated)-fit policy that manages a free list per proper range size for medium size requests and half-fit policy that manages a free list per proper range size for medium size requests and half-fit policy that manages a free list per each power of 2 size for large size requests. The proposed algorithm has the time complexit O(1) and makes us able to easily estimate the worst case execution time(WCET). This paper also suggests two algorithm that finds the proper free list for the requested memory size in predictable time and if the found list is empty then finds next available non-empty free list in fixed time. In order to confirm efficiency of the proposed algorithm we simulated the memory utilization of each memory allocation policy. The simulation result showed that each policy guarantees the constant WCET regardless of memory size but they have trade-off between memory utilization and list management overhead.

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Prediction Algorithm of Threshold Violation in Line Utilization using ARIMA model (ARIMA 모델을 이용한 설로 이용률의 임계값 위반 예측 기법)

  • 조강흥;조강홍;안성진;안성진;정진욱
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.8A
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    • pp.1153-1159
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    • 2000
  • This paper applies a seasonal ARIMA model to the timely forecasting in a line utilization and its confidence interval on the base of the past data of the lido utilization that QoS of the network is greatly influenced by and proposes the prediction algorithm of threshold violation in line utilization using the seasonal ARIMA model. We can predict the time of threshold violation in line utilization and provide the confidence based on probability. Also, we have evaluated the validity of the proposed model and estimated the value of a proper threshold and a detection probability, it thus appears that we have maximized the performance of this algorithm.

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