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결함 포용 정적 Shuffle-Exchange 네트워크
최홍인(Choi Hong In) 한국정보과학회 2003 정보과학회논문지 : 시스템 및 이론 Vol.30 No.3·4
정적 shuffle-exchange 네트워크는 여러 응용 알고리듬에 적용되고 현재 많이 사용되는 다중 단계 네트워크에 비해 적은 하드웨어를 사용하는 등 많은 장점이 있으나 아직까지 어떤 병렬처리 컴퓨터에도 채택된 없었다. 그 이유 중에 하나는 결함 내성 기능이 없었기 때문이다.본 논문에서는 다중 결함 포용 정적 shuffle-exchange network를 소개한다. 본 논문에서 제시되는 결함 포용 정적 shuffle-exchange 네트워크는 k 결함을 제어하기 위해서 최소 2k의 추가 처리 요소들과 각 처리 요소들은 최대 4k의 추가 shuffle 링크를 필요로 한다. k 결함 내성을 가진 정적 shuffle-exchange 네트워크를 개의 동일한 모듈로 분리하여 네트워크의 신뢰성을 증가시키는 것을 보였다. A static shuffle-exchange network is not only useful for several parallel applications but also use less hardware than the popular multi-stage network or hypercube. Even though it has a lot of advantages, it has never been used in any implemented parallel machine. One of the reasons is there has not been any techniques to make the network fault-tolerant. In this paper multiple fault-tolerant static shuffle-exchange networks are presented. In order to recover fromfaulty processing elements, a network needs at least 2 additional processing elements and at most 4 additional shuffle ports for each processing elements. By decomposing thefault-tolerant static shuffle-exchange network intoidentical modules, this paper shows that the reliability of the network can be increased.
ATM 교환을 위한 비용 효율적인 동적 결함내성 bitonic sorting network
이재동 ( Jae Dong Lee ),김재홍 ( Jae Hong Kim ),최홍인 ( Hong In Choi ) 한국정보처리학회 2000 정보처리학회논문지 Vol.7 No.4
This paper proposes a new fault -tolerant technique for bilonic sorting networks which can be used for designing ATM switches based on Batcher-Banyan network. The main goal in this paper is to design a cost-cficctive fault-lolerant butome sorting network. In order to recover a fault, addional comparison elements and addional links are used A Dynamic Redundant Bilonic Sortig (DRBS) network is based on the Dynamic Redundant network and can be constructed with several different vanations. The proposed fault-tolerant sorting network offers high fault-tolerance; low time delays, maintenance of cell sequence, simple routing; and`` regularity and modulatity.
한국 여수에서 채집된 매가오리과 (Myliobatidae) 어류 첫기록종, Mobula thurstoni
명세훈 ( Se Hun Myoung ),송영선 ( Young Sun Song ),강충배 ( Chung-bae Kang ),최홍인 ( Hong-in Choi ),김종관 ( Jong-gwan Kim ),윤문근 ( Moongeun Yoon ),임재복 ( Jaebok Im ),한동진 ( Dong-jin Han ) 한국어류학회 2021 韓國魚類學會誌 Vol.33 No.2
매가오리목 매가오리과에 속하는 Mobula thurstoni 2개체 (1770~1850mm 체반폭)가 2018년 9월 전라 남도 여수시 연도 연안에서 정치망으로 채집되었다. 이 종은 가슴지느러미의 앞부분이 이중 굴곡이고, 등지느러미 바로 뒤 꼬리 시작부분에 가시가 없으며, 등지느러미 끝부분에는 흰색이고, 그리고 등쪽의 체색이 어두운 남색을 띤다. Mobula kuhlii와 가장 형태적으로 유사하였지만, 가슴지느러미 앞부분에 이중 굴곡을 가지고 있다는 점 (vs. 직선이거나 약간의 굴곡을 가진다)과 등쪽 체색이 어두운 남색을 띤다는 점 (vs. 회갈색)에서 잘 구분된다. 또한, 이종은 M. kuhlii와 미토콘드리아 16S rRNA 영역에서 유전적 거리 0.030~0.069의 차이를 보여 구분되었다. 이 종의 새로운 국명으로 ‘매끈꼬리쥐가오리’를 제안한다. Two specimens (1770~1850 mm disc width) of Mobula thurstoni, belonging to the family Myliobatidae, order Myliobatiformes, were first collected from the central coast of the Southern Sea of Korea in September 2018. This species is characterized by an anterior margin of disc with double curvature, a white-tipped dorsal fin, and the absence of a caudal spine. This species is morphologically similar to Mobula kuhlii, but has an anterior margin of pectoral fins with a double curvature and the dorsal coloration is bluish black rather than white. In addition, M. thurstoni was well distinguished from M. kuhlii as determined by mitochondrial DNA 16S rRNA sequences with genetic distances ranging from 0.030 to 0.069. The Korean name ‘Mae-kkeun-kko-li-jwi-ga-o-li’ is proposed for the species M. thurstoni.
염산산성 용액중에서 철에 의한 안티몬의 세멘테이션에 관하여
오재현,양훈영,고인용,최홍 대한금속재료학회(대한금속학회) 1983 대한금속·재료학회지 Vol.21 No.1
Antimony cementation by iron in hydrochloric acid solution was carried out using rotating disc technique to study the effect of disc rotating speed, reaction temperature, initial Sb (III) ion concentration and atmosphere on the rate of cementation. The results obtained in this experiment are as follows; 1) Two reaction rate periods were found in the cementation: ie, an "initial" slow rate and a "final" enhanced rate periods. These are first-order reaction rate processes and can be expressed by the following equation. d/dt[Sb^(+++)] = -[Sb^(+++)] k·A. 2) The cementation rate increased with increasing temperature and initial Sb (III) ion concentration because the morphology of antimony deposit became porous. 3) In case of the excess existence of non-cementable ions such as Fe^(++), Fe^(+++), the cementation rate docreased with the ionic strength increment of solution. 4) Under oxygen containing atmosphere, Fe(II) ions are oxidized to Fe(III) ions and these oxidized ions are reduced by Fe disc to Fe(II) ions. These reactions interfere with antimony cementation reaction. 5) The apparent activation energy was found to be 3.2 ㎉/mole in initial rate period, in enhanced rate period 2.2 ㎉/mole above 40℃. Therefore, the rate controlling step is supposed to be diffusion through boundary layer, whereas it changes to surface reaction in enhanced rate period below the temperature of 30℃.