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Reduction of Steady-State Error Using Estimation for Re-Entry Trajectory (추정을 이용한 재진입 궤적의 정상상태 오차감소)

  • 박수홍;이대우
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2001.11a
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    • pp.130-134
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    • 2001
  • In the re-entry control system, errors apt to induce because the time derivative of drag acceleration is analytically estimated. Still more, the difficulty of estimation of the exact drag coefficient in hypersonic velocity and the nun-reality of the scale height cause a steady-state drag error. This paper proposes the additional method of the disturbance observer. This reduces the steady-state drag error according to the following series. First, this method estimates a error in drag acceleration time derivative by the analytic calculation and then creates the new drag acceleration time derivative using the estimated error. The performance of the re-entry control system is verified about 32 reference trajectories.

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Focal Parts of Utterance in Busan Korean

  • Cho, Yong-Hyung
    • Speech Sciences
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    • v.9 no.4
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    • pp.149-163
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    • 2002
  • Focal parts of utterance can be determined by new/contrastive information, a focus particle, a contrastive topic marker, or a nominative case marker in Busan Korean. Among these factors, new or contrastive information is the most important element in determining the intonational nucleus of an utterance. However, unlike Seoul Korean, when a focus particle, a topic marker, or a case marker contributes to the placement of the most prominent peak of an utterance, the peak is on the noun to which they are attached. Moreover, the case marker-ga shows more prominent pitch on the preceding noun than the noun followed by the topic marker-nun when-ga is used as emphatic or contrastive. This is one of the major problems for Busan Korean users in commanding natural and fluent Seoul Korean intonation even if they use standard written form of Seoul Korean in their speech.

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Effect of Jebikong(Dolichos lablab L.) Leaves Extract on Enzyme Activities in Mice Blood (제비콩(Dolichos lablab L.) 잎 추출물이 쥐의 혈청효소활성에 미치는 영향)

  • 김용욱;최우철;신미경;한성희;임세진;김명애
    • Korean Journal of Organic Agriculture
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    • v.9 no.3
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    • pp.85-92
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    • 2001
  • The effect of Dolichos lablab leave extract on enzyme activities in mice blood was investigated in this study to clarify the new useful application of the Plant leaves. There were not significant differences in the enzyme activities in mice blood among treatment fed with the leave extract and non fed control. The feeding treatment with the extract showed a tendency to activity compared to the nun fed control. The activities of glutamate oxaloacetate transaminase, glutamate pyruvate transaminase and lactate dehydrogenase in mice blood at the treatment fed with lead and the leave extract were significantly low compared to their activities at the non fed treatment with the extract, respectively. The choline esterase activity was high at the leave extract feeding. The cadmium dietary treatment showed the same result as the lead treatment. In conclusion, the physiological function of the Jebikong leave was significantly in creased when the mice was stressed by the hear metal intake. Therefore, the plant leave extract would consider the reduction of heart metal effect.

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Analysis of Voter's Acceptance to Female Politician's Appearance

  • Kwon, Tae-Soon;Yang, Cheui-Kyung
    • Journal of Fashion Business
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    • v.8 no.6
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    • pp.103-112
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    • 2004
  • A Politician Appearance Acceptance Model (PAAM model) was formed and designed based on an analysis of how the electorate would accept a female politician. The PAAM model evaluated factors which influenced the voter's view of the female politician based on appearance. Causative factors were assessed that impacted acceptance based on appearance and analyzed whether voting was influenced by the appearance image; appearance image preferences for a female politician included the classic, dramatic, romantic and natural images. Through validations, the appearance image and competency had a causative factor that contributed to the acceptance of the politician image. The Classic Image demonstrated the strongest and most important image among the appearance images. As voters were more interested in the appearance image of a female politician, more emphasis and weight was on the appearance image during the voting selection process.

Direct Sequence Spread Spectrum Transmitter using FPGAs

  • Abhijit S. Pandya;Souza, Ralph-D′;Chae, Gyoo-Yong
    • Journal of information and communication convergence engineering
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    • v.2 no.2
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    • pp.76-79
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    • 2004
  • The DS-SS (Direct Sequence Spread Spec1nun) transmitter is part of a low data rate (∼150 kbps - burst rate and 64 bps - average data rate) wireless communication system. It is traditionally implemented using Digital Signal processing chip (DSP). However, with rapid increase in variety of services through cell phones, such as, web access, video transfer, online games etc. demand for higher rate is increasing steadily. Since the chip rate and thereby the sampling rate requirements of the system are fairly high, the transmitter should implemented using Field programmable Gate Arrays FPGAs instead of a DSP. This paper shows the steps taken to get a working prototype of the transmitter unit on a FPGA based platform.

Evalution of Hemolysis in Axial Flow Blood Pump with Computational Fluid Dynamics Analysis (전산유체해석을 이용한 축류형 혈액펌프의 용혈평가)

  • 임상필;김동욱
    • Proceedings of the KAIS Fall Conference
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    • 2003.06a
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    • pp.256-259
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    • 2003
  • Artificial heart is divided pulsation style and nonpulsation style greatly according to flowing of blood. nonpulsation pump is advantage of miniaturization avaliable because it is simple and non-volumic-pump than pulsation pump. Non pulsation pump is derided axial flow style and centrifugal style accordig to rotating style. An axial flow blood pump can be made smaller than a centrifugal blood pump because of its higher specific speed. A hemolysis is an important factor for the development of an axial flow blood pump. It is difficult to identify the areas where hemolysis nun. Evaluation of hemolysis both in in vitro and in vivo require a long time and are costly. Computational fluid dynamics(CFD) analysis enables the engineer to predict hemolysis on a computer. The aims of this study is Computational fluid dynamics in the whole axial flow pump and to verify the accuracy of prediction results of CFD analysis compare with in vitro experimental results.

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Two Unrecorded Species of Sharks in Korean Waters (한국 연근해 상어류 2미기록종)

  • Choi, Youn;Im, Min Yeong
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.6
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    • pp.965-967
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    • 2020
  • Two shark species captured in Samcheok in 2006 and Ulsan in 2013, previously reported as Heptranchias perlo and Alopias pelagicus, were confirmed to in fact be Hexanchus griseus and A. superciliosus, respectively, neither of which has previously been reported in Korea. H. griseus has six gill slits and is thus distinguishable from Heptranchias perlo, which has seven gill slits. A. superciliosus is clearly distinguishable from A. pelagicus and A. vulpinus, members of the family Alopiidae, due to its large eyes and a groove extending from the center of the head to both eyes. The keys to the family Hexanchidae, including H. griseus, and the family Alopiidae, including A. superciliosus, were presented along with the morphological characteristics of these two new shark species. These two species were given the Korean names "Gi-reum-sang-eo" and "Keun-nun-hwan-do-sang-eo," with reference to their morphological characteristics and English names.

New Record of Chlorophthalmus nigromarginatus (Aulopiformes: Chlorophthalmidae) from Korea (한국산 파랑눈매퉁이과(홍메치목) 어류 1 미기록종, Chlorophthalmus nigromarginatus)

  • Jang, Jae-hoon;Lee, Yu-Jin;Kim, Jin-Koo
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.55 no.5
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    • pp.730-735
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    • 2022
  • Two specimens of Chlorophthalmus nigromarginatus Kamohara, 1953 (51.02 mm, 66.04 mm in standard length) belonging to the family Chlorophthalmidae were collected on February 8, 2022 in the eastern Jeju-do Island, Korea using a bottom trawl. The species has the following morphological characteristics: snout length almost the same as orbit diameter, bump absent on predorsal, caudal fin with posterior black margin. C. nigromarginatus is morphologically very similar to C. acutifrons but can be distinguished by caudal fin with black margin (C. acutifrons has no black margin). Molecular analyses showed that our specimens almost matched with C. nigromarginatus according to mtDNA 16S rRNA sequences (99.8%). Therefore, we propose a new Korean name for C. nigromarginatus, "Geom-eun-kko-ri-pa-rang-nun-mae-tung-i".

A Non-Uniform Network Split Method for Energy Efficiency in a Data Centric Sensor Network (데이타 중심 센서 네트워크에서 에너지 효율성을 고려한 비균등 네트워크 분할 기법)

  • Kang, Hong-Koo;Kim, Joung-Joon;Han, Ki-Joon
    • Journal of Korea Spatial Information System Society
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    • v.9 no.3
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    • pp.35-50
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    • 2007
  • In a data centric sensor network, a sensor node to store data is determined by the measured data value of each sensor node. Therefore, if the same data occur frequently, the energy of the sensor node to store the data is exhausted quickly due to the concentration of loads. And if the sensor network is extended, the communication cost for storing data and processing queries is increased, since the length of the routing path for them is usually in the distance. However, the existing researches that generally focus on the efficient management of data storing can not solve these problems efficiently. In this paper, we propose a NUNS(Non-Uniform Network Split) method that can distribute loads of sensor nodes and decrease the communication cost caused by the sensor network extension. By dividing the sensor network into non-uniform partitions that have the minimum difference in the number of sensor nodes and the splitted area size and storing the data which is occurred in a partition at the sensor nodes within the partition, the NUNS can distribute loads of sensor nodes and decrease the communication cost efficiently. In addition, by dividing each partition into non-uniform zones that have the minimum difference in the splitted area size as many as the number of the sensor nodes in the partition and allocating each of them as the processing area of each sensor node, the NUNS can protect a specific sensor node from the load concentration and decrease the unnecessary routing cost.

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Christina Rossetti's Maude : Self-Abnegation and Self-Expression of a Victorian Poet (크리스티나 로제티의 『모드』 : 빅토리아 시대 시인의 자기 단념과 자기표현)

  • Ha, Myungja
    • Cross-Cultural Studies
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    • v.25
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    • pp.391-420
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    • 2011
  • Christina Rossetti's novella Maude displays Tractarian influences in terms of Holy Eucharist, Puseyism, and the doctrine of Reserve. Tractarianism is High Church revival movement of nineteenth century. In the story a teenage girl, Maude went through hard time receiving Holy Eucharist due to self-consciousness and internal guilt according to Puseyism. She felt guilty when she enjoyed worldly things and outward beauty. Due to guilt Maude refused to receive Holy Communion, which is complete connection to God. Her cousin, Agnes suggested that in refusing Holy Communion Maude is following her own will not God's will. Later Maude overcame Puseyite thought of self-hatred and reconciled with her identity as a poet and a woman. Maude oscillates between concealing and revealing, secrecy and truth, sincerity and affectation, and modesty and display. Her marvelous poetic talent makes people praise her but she withholds private feelings and attempts to divert attention from herself. Like Maude herself, the meaning of her poems is at times reserved and withheld. This tendency goes with the doctrine of Reserve in Tractarianism. The doctrine of Reserve utilizes indirect methods to reveal divine attributes because finite human being can not accept infinite God. The doctrine of Reserve sees to it that the expression will be veiled, indirect, subdued and self-effacing. Rossetti adapts a poetic method of Reserve when Maude has anxiety over 'display and poetry' and generates the reticence, secrecy, mystery, renunciation, modesty and detachment. According to Mary Arseneau, by veiling and expressing herself through symbols she can rise above the self and employ the phenomenal to suggest a noumenal reality. Thus the poetry becomes an expression of longing for the divine. The poem "Three Nuns" exemplifies Maude's maturity and gradual progress in the relationship with God. Rossetti suggests the vision full of hopes and promises of reuniting with God. In conclusion, in some sense, authoritative and conservative Tractarianism affects Rossetti both ways. On the one hand, it makes Rossetti abnegate herself and leads her to asceticism, on the other hand, it makes Rossetti express her faith in God and write amazing devotional poems such as "Three Nuns". A poem within the poem has three voices that are in perfect harmony. In the poem the first and second nun show hesitation to fully commit to God's will and the desire for the world prevents them from having heavenly joy. Third nun reveals spiritual maturity and sings new life in God where their hopes and joys begin. Rossetti expresses the procedure of spiritual growth through the poem "Three Nuns". For Rossetti, self-abnegation and self-expression both are involved in the doctrine of Reserve, Puseyism and Holy Communion.