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Some Remarks on Kor-Pol Interlanguage Phonotactic Phenomena
Emilia Szalkowska(에밀리아 솰코브스카) 아시아·중동부유럽학회 2007 동유럽발칸학 Vol.9 No.2
본 논문은 한국인이 폴란드어를 습득하는 과정에서 형성되는 한-폴 중간언어의 음소배열 현상을 보여주는 것을 목적으로 하며, 주로 선형구조어휘에서의 자음 분포 제약을 다룰 것이다. 현재 폴란드어를 배우는 20명의 한국어 모국어 화자를 대상으로 약 4500개의 대상 문장을 수집하여 연구 분석하였다. 본 연구는 제2언어 사용 시 나타나는 자음 삽입, 탈락, 음운 전위, 대용 등과 같은 자음 결합에 대한 “보수책략 (repair strategies)”을 분석하는 데 기여할 수 있을 것으로 기대된다. This study investigates selected issues in Korean and Polish phonology with the focus on KorPol interlanguage phonotactic phenomena. It addresses quantitative and qualitative restrictions on the consonant distribution in the word linear structure. Data under study consists of more than 4500 speech samples from 20 speakers - Korean learners of Polish at HUFS. The work is mainly devoted to the analysis of consonant cluster “repair strategies” occurring in L2 phonology, such as epenthesis, reduction, metathesis and substitution.
Evaluation of Asymmetric RTS/CTS Method with Mobility
Emilia Weyulu(에미리아),Masaki Hanada(하나다),Hidehiro Kanemitsu(가네미쯔),Moowan Kim(김무완) 한국정보과학회 2019 정보과학회 컴퓨팅의 실제 논문지 Vol.25 No.2
무선노드의 이동은 송신노두와 수신노두간의 경로정보를 동적으로 변경하기 때문에 exposed 노두 문제를 악화시킨다. 본 논문에서는 IEEE 802.11 W-LAN의 표준 RTS/CTS 방식을 확장하여 제안한 비대칭 RTS/CTS 방식의 이동을 고려한 평가결과를 제시한다. RWP(Random Waypoint) 이동모델을 적용하면서, 비대칭 RTS/CTS 방식은 전파 도달거리를 적응적으로 제어하여 exposed 노두 문제에 대응하고 있다. NS-2를 사용한 시뮬레이션 결과, 비대칭 RTS/CTS 방식은 최대 30%이상 표준 RTS/CTS 방식에 비해 성능 향상을 보였다. 또 향후의 연구 방향과 연구 과제를 제시한다. The mobility of wireless nodes exacerbates the problem of exposed nodes as routes between the source and the target of information change because of movement. This paper presents the evaluation result of the proposed asymmetric RTS/CTS method in IEEE 802.11 W-LANs by considering mobility. Based on RWP (Random Waypoint) model, the proposed method considers the constantly changing transmission ranges and utilizes asymmetric transmission ranges for RTS and CTS control frames to solve the problem of exposed nodes problem. The simulation results obtained through NS-2 show that the proposed RTS/CTS method improves network performance. With mobility, the throughput gain of asymmetric RTS/CTS method is significantly more, with up to 30% increase over the standard RTS/CTS method.
Aptamer-based Depletion of Small Molecular Contaminants: A Case Study Using Ochratoxin A
Emilia Schax,Maren Lönne,Thomas Scheper,Shimshon Belkin,Johanna-Gabriela Walter 한국생물공학회 2015 Biotechnology and Bioprocess Engineering Vol.20 No.6
Based on the increasing demand for detection and depletion of small molecules like mycotoxins or pesticides in food, water, or pharmaceuticals, aptamers are gaining more importance as sensitive, specific-depletion molecules. Here, we present an aptamer-based method for depletion of ochratoxin A (OTA) as a model system and show the advantages and the limitations of aptamers in the depletion of small molecular contaminants. OTA is a mycotoxin produced by various Penicillium and Aspergillus strains and is often found in grain and grain derivatives. We immobilized a well-described DNA aptamer against OTA on an agarose gel and used the column as a clean-up system. The aptamer shows a high specificity and sensitivity for OTA: Ochratoxin B, a molecule similar to OTA, was not bound by the aptamer; and a control oligonucleotide was not able to bind OTA. After optimizing the process for better economic feasibility, the column could be used for several times without loss of aptamer activity. We investigated the location of immobilized aptamer within the gel using fluorescent-labeled aptamers. Furthermore, beer samples spiked with OTA were used to investigate aptamer activity in complex samples. Using these complex samples we have observed a significant loss of aptamer activity. We have further investigated this limitation by performing microscale thermophoresis experiments to determine the KD values of the aptamer in different complex samples like beer, coffee, juice and wine. Our results indicate that the applicability of aptamers to real processes is currently restricted by the selection buffer used during its selection process (SELEX). We therefore suggest using conditions closer to those of the later application of the aptamer during future SELEX experiments.
Comparison of consonantal allophony in Polish and Korean
Emilia Szalkowska 아시아중동부유럽학회 2012 동유럽발칸학 Vol.14 No.1
This article aims at a comparative study of consonantal allophony in Polish and Korean. It seems that in contrastive phonological research there is a need not only to show quantitative regularities in phonological inventories, e.g. phoneme \≠\ is present in x% of languages but also to show whether a feature (or a segment) is distinctive in given languages or appears only at the phonetic level, cf. phoneme \≠\ in Polish but only an allophone [≠] of the phoneme /n/ in Korean. Vowel allophony is not taken into consideration here as it is quite poor and most of modifications are the results of coarticulation. First, the phonological conditions for complementary and free variant allophony are given. Secondly, the most distinctive Polish and Korean allophones aredescribed. Thirdly, it is shown that there are various traditions in the description of allophony, as it is dealt with both by phoneticians and phonologists. Polish and Korean phonemes and their variants are compared in tables which contain also examples of the pronunciation of words containing these allophones. It is concluded that Korean unmarked phonemes exhibit stronger tendency to variability than marked ones and such variability it does not occur in Polish. An obstruent neighbored on both sides by vowels or sonorants can become voiced in Korean but it is not a universal tendency. Variability of Korean fortis and aspirated consonants as well as Polish (pre)palatal consonants is minimal. It is shown that selection of the main variant and norm can be quite hard (cf. complementary distribution of Korean [l]/[|]). Consonants: /Ç/, /t°Ç/ and \≠\ are separate phonemes in Polish but in Korean they are only the allophones of phonemes /s/, /t°S/ and /n/ respectively.