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무선 애드 혹 기반 액티브네트워크상에서 QoS지원에 관한 연구
李基源,裵振勝,丁燦赫,金玄郁,李光培,姜景仁,朴京培,文泰洙,郭承郁,河載承 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-
Abstract - In this thesis, we propose a QoS supporting method on wireless ad hoc-based active network for improving reliability. On the loss of route path, the existing DSR routing protocol has several problems with wireless network communication because of decease of data reception rate and increase of network load. The proposed method improves reliability of data transfer by using functions of active network. That is, by using functions of active nodes and active packets, the proposed method supports QoS with reservation transfer method that saves data packets on transfer at intermediate nodes with lost path and then re-transmit the packets after route reconfiguration.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
포스트-텐션 프리캐스트 외부 넓은 보-기둥 접합부의 비탄성 거동
박상욱,최윤철,김영찬,김대중,임재형,권기혁,문정호,이리형 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
Experimental results from the cycle lateral load tests for post-tensioned precast wide beam-column connections were presented. Six exterior beam-column assemblages of half scale were tested in the laboratory. The specimens consist of U-shaped precast wide beams and concrete columns. The continuity at the beam-column joint is achieved with the topping concrete and post-tensioning. The specimens were designed with parameters of the beam-to-column depth ration and the number of tendons within column core. The test results showed that the post-tensioned precast wide beam-column connection satisfied the provisional standard by ACI of acceptance criteria for concrete special moment frames.
프리캐스트 포스트텐션 콘크리트 넓은 보-기둥 내부 접합부의 비탄성 거동
황재환,최윤철,김영찬,김대중,임재형,권기혁,문정호,이리형 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2(구조계)
The purpose of this paper is to evaluate the response of Precast Prestressed Concrete Interior Wide Beam-Column Joint subjected to cyclic lateral loading. To this end, the experimental investigation was performed with six half-scale specimens of interior connection. The design parameters are the beam to column depth ratio, and the number of tendons within column core. One of the specimens, IJH-6, is modeled for the connection at the top floor of a structure. The test results showed that the specimens sufficiently resist up to limiting drift ratio of 0.035 in accordance with the provisional standard by ACI of acceptance criteria for concrete special moment frames.
전신홍반루푸스에서 발생한 만성 염증성 수초탈락성 다발성 신경병증
문기원 ( Ki Won Moon ),송영욱 ( Yeong Wook Song ),송란 ( Ran Song ),윤찬영 ( Chan Young Yun ),고재기 ( Jae Ki Koh ),김진현 ( Jin Hyun Kim ),이은영 ( Eun Young Lee ),이은봉 ( Eun Bong Lee ) 대한류마티스학회 2009 대한류마티스학회지 Vol.16 No.3
Chronic inflammatory demyelinating polyneuropathy (CIDP) is characterized by symmetrical weakness, impaired sensation, absent or diminished tendon reflexes, an elevated cerebrospinal fluid protein level and nerve-conduction studies that show demyelination. The occurrence of CIDP in patients with systemic lupus erythematosus (SLE) has been rarely reported. We experienced a case of a 33 year-old woman with SLE and she presented with fever, abdominal pain, a tingling sensation of both of her hands and feet, and symmetrical weakness in both the proximal and distal extremities. Her symptoms had persisted for over 1 months before she visited our department. The CSF examination showed an elevated protein level and the nerve conduction studies revealed demyelination. Her symptoms showed minimal improvement with high dose steroid and immunoglobulin therapy, but she responded to cyclophosphamide therapy.
Hwang, Moon Chan,Jang, Jae-Wan,An, Tae Kyu,Park, Chan Eon,Kim, Yun-Hi,Kwon, Soon-Ki American Chemical Society 2012 Macromolecules Vol.45 No.11
<P>A series of new p-type polymers, PNDT-T and PNDT-TT, with enforced coplanar structure for effective π-electron delocalization, having naphtho[2,1-<I>b</I>:3,4-<I>b</I>′]dithiophene and thiophenes as main core units, were successfully synthesized by Stille coupling reaction. The naphtho[2,1-<I>b</I>:3,4-<I>b</I>′]dithiophene unit of the polymer main chain enhances charge carrier mobility by extending π-conjugation length and rigidly enforced coplanar structure. Both polymers, PNDT-T and PNDT-TT, have high thermal stability up to 250 °C with a high <I>T</I><SUB>g</SUB> of 402 °C. On the basis of AFM and XRD results, it was found that PNDT-TT showed relatively more highly ordered intermolecular structures than did PNDT-T, with thiophene unit and high field-effect mobility, because the bithiophene unit provides crystallinity with increasing planarity and enough space for interdigitation of the long alkyl side chains for high order. These new p-type polymers PNDT-T and PNDT-TT exhibit high carrier mobilities of 0.01 and 0.076 cm<SUP>2</SUP>/(V s) and on/off ratios of 4 × 10<SUP>5</SUP> and 7 × 10<SUP>6</SUP>, respectively. The above results indicate that the plate structure with a sulfur-containing fully aromatic system, which has the upper direction extended, could enhance the thermal stability and charge transport characteristics for OTFT applications.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mamobx/2012/mamobx.2012.45.issue-11/ma300540f/production/images/medium/ma-2012-00540f_0011.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ma300540f'>ACS Electronic Supporting Info</A></P>