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DHT 기반 P2P 시스템에서 자율적인 인기도 측정을 이용한 복제 전략
한동윤(Dongyun Han),차봉관(Bonggwan Cha),손영성(Youngsong Son),김경석(Kyongsok Kim) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
P2P (Peer-to-peer) 파일 공유 시스템에서 컨텐츠의 복제는 Hot Spot의 방지와 가용성의 보장, 검색 속도의 향상을 위해 사용되고 있다. 컨텐츠의 복제본의 수(공간 효율성)와 검색 성능은 일종의 trade-off로써 이 논문에서는 가능한 검색 성능을 향상시키면서 적절한 양의 복제본의 수를 유지하는 방법인 SRoD 알고리즘을 제안한다. SRoD는 DHT 기반 파일공유시스템에서 전반적으로 간단하게 접목하여 사용할 수 있다는 장점을 가지고 있다. 이러한 특징은 P2P가 추구하는 자율성과 평등성을 보장하기 위한 것이다. 본 논문에서는 SRoD 알고리즘을 설명하고 이것의 장점과 보완해야 할 점에 대해 논하게 될 것이다.
EAI(E-Mail Address Internationalization) bis 표준을 지원하는 SMTPUTF8 메일 서버의 설계 및 구현
한동윤(Dongyun Han),김경석(Kyongsok Kim) 한국IT서비스학회 2013 한국IT서비스학회지 Vol.12 No.2
Recently EAI WG of IETF has published standards for multilingual support in the local part of the e-mail address. Between 2009 and 2010, EAI WG published RFC documents, called the EAI standard, extension to the existing mail-related RFC documents, and EAI has been implemented and tested. In the course of reviewing the results, this yielded a proposal to modify the EAI standard. As a result. EAI WG has publ ished modified RFC documents, called the EAI bis standard. SMTPUTF8 mail server described in this paper has been implemented according to the EAI bis standard. In addition, it has the ability to support two different standards to support the multilingual domain part of the e-mail address, IDNA and EAI bis. Futhermore, SMTPUTF8 mail server can encode in punycode the local part of the e-mail address. Finally, interoperability testing shows that SMTPUTF8 mail server is well-implemented according to the EAI bis standard.
한동윤(Dongyun Han),김경석(Kyongsok Kim) 한국정보과학회 2014 정보과학회논문지 : 데이타베이스 Vol.41 No.3
플래시 메모리는 성능이 좋고 전력 소모가 적다는 점 등 많은 장점을 가지고 있어 PC를 비롯한 각종 단말에서 아주 많이 사용되고 있다. 하지만 기존의 운영체제 및 DBMS들에서 사용되는 색인 기법들은 디스크 기반 저장 장치의 특성을 고려하여 만들어졌기 때문에 플래시 메모리 저장 장치의 특성에 맞게 수정한다면 더욱 좋은 성능을 기대할 수 있다. 본 논문에서는 플래시 메모리 저장 장치에 특성에 맞춘 원형 해시 색인 기법을 제안한다. 원형 해시 색인 기법은 무효 페이지의 개수를 줄임으로써 New Dynamic Hashing 기법보다 나은 성능을 제공한다. Because the flash memory has many advantages, such as high performance and low power consumption, it is being used a lot in various terminals including PC. However, index techniques used in the existing operating systems and DBMSs designed to consider the characteristics of disk-based storage devices. If index techniques are modified to fit the characteristics of flash memory storage devices, a good performance can be expected. In this paper, a circular hash indexing technique is proposed. It focuses on the characteristics in flash memory storage devices. A circular hash indexing technique provides better performance than the new dynamic hashing technique by reducing the number of invalid pages.
Exploration of Novel 2-Alkylimino-1,3-thiazolines: T-Type Calcium Channel Inhibitory Activity
Han, Minsoo,Nam, Kee Dal,Shin, Dongyun,Jeong, Nakcheol,Hahn, Hoh-Gyu American Chemical Society 2010 Journal of combinatorial chemistry Vol.12 No.4
<P>We have developed combinatorial libraries of new 2-alkylimino-1,3-thiazolines with four diversity points, consisting of more than 500 compounds, in a parallel synthetic fashion. The synthetic strategy was based on the construction of a large library aimed at the discovery of new compounds with T-type calcium channel inhibitory activity through structure modifications of hit compound <B>2</B>. The syntheses of the compounds of Chemset A with four diversity points were accomplished by the condensation of thioureas <B>5</B> with α-haloketones <B>6</B>{<I>1−66</I>} having two diversity points each. A library of phthalimidyl 1,3-thiazolines <B>24</B> was synthesized to provide Chemset B, which allowed the introduction of other diversity points through the nucleophilic character of the amino nitrogen. A sublibrary, Chemset C, was constructed from the libraries of Chemset A and Chemset B by functionalization of the C-4 position of the 1,3-thiazoline ring. The products containing ester or acid groups at the C-4 position of the 1,3-thiazoline ring were used in amide synthesis to give a new sublibrary within Chemset C. Deprotection of the phthalimidyl moiety of <B>24</B> followed by the reaction with benzoyl chloride gave the corresponding sublibrary in Chemset C. Another sublibrary which includes secondary amino derivatives was obtained by reduction of the amide moiety or reductive amination of <B>23</B> with phenyl aldehyde. The selected compounds from the generated libraries were evaluated with respect to inhibition of T-type calcium channels, where some of them have exhibited promising activity.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jcchff/2010/jcchff.2010.12.issue-4/cc100041m/production/images/medium/cc-2010-00041m_0022.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cc100041m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cc100041m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cc100041m'>ACS Electronic Supporting Info</A></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cc100041m'>ACS Electronic Supporting Info</A></P>
Dongyun Lee,Bong-Jo Kim,Ji Won Han,Tae Hui Kim,Kyung Phil Kwak,Kayoung Kim,Shin Gyeom Kim,Jeong Lan Kim,Tae Hyun Kim,Seok Woo Moon,Jae Young Park,Joon Hyuk Park,Seonjeong Byun,Seung Wan Suh,Ji Young S 대한신경정신의학회 2020 PSYCHIATRY INVESTIGATION Vol.17 No.1
Objective: Cardiovascular diseases are representative risk factors for the onset of cognitive decline. The purpose of this study was to confirm the relationship between diastolic blood pressure and cognitive function in elderly people in Korea. Methods: Data from subjects who were enrolled in the prospective Korean Longitudinal Study on Cognitive Aging and Dementia were used in this study. Data from 701 subjects whose diastolic blood pressure range did not change (≤79 mm Hg or ≥80 mm Hg) over 2 years were analyzed. To analyze the differences in cognitive function between the groups at the 2-year follow-up, an analysis of covariance was performed with covariates, which were significantly different between the two groups, and the baseline cognitive function. Results: Significant differences were observed between the two groups, and the mean scores on the constructional praxis (η2=0.010) and word list recall tests (η2=0.018) in the diastolic blood pressure ≥80 mm Hg group were higher than those in the diastolic blood pressure ≤79 mm Hg group at the 2-year follow-up. Conclusion: These results indicate that maintaining a DBP below 79 mm Hg presents a greater risk of cognitive decline in Korean elderly people.
종합격투기체육관 서비스스케이프가 수련생 감정반응, 수련생만족 및 행동의도에 미치는 영향
노동연 ( Dongyun Roh ),공성배 ( Seongbae Kong ),한대호 ( Daeho Han ),박정훈 ( Jeonghun Park ) 대한무도학회 2015 대한무도학회지 Vol.17 No.2
이 연구는 2015년 현재 서울·경기지역에 위치하고 있는 종합격투기체육관 수련생을 대상으로 종합격투기체육관에서 제공하는 서비스스케이프가 수련생의 감정반응, 만족 및 그들의 행동의도에 어떠한 영향을 미치는지를 알아보는데 목적이 있다. 연구대상은 각 종합격투기체육관별로 설문을 안배하여 유의표본추출법을 이용하여 311명의 자료를 사용하였다. 자료처리는 SPSS 18.0 프로그램을 이용하여 빈도분석, 요인분석, 상관분석, 회귀분석을 실시하였다. 이상과 같은 연구방법 및 절차를 통하여 다음과 같은 결론을 도출하였다. 첫째, 서비스스케이프의 하위변인인 심미성, 공간배치, 편의성, 주변요소 등 모든 변인에서 수련생 감정반응의 하위변인인 긍정적 반응에 유의한 영향을 미치며, 편의성에서 부정적 반응에 유의한 영향을 미치는 것으로 나타났다. 둘째, 서비스스케이프의 하위변인인 심미성, 공간배치에서 수련생만족에 유의한 영향을 미치는 것으로 나타났다. 셋째, 서비스스케이프의 하위변인인 심미성, 공간배치, 주변요소에서 행동의도의 하위변인이 재구매의도에 유의한 영향을 미치며, 심미성, 공간배치, 편의성에서 추천의도에 유의한 영향을 미치는 것으로 나타났다. 넷째, 수련생 감정반응의 하위변인인 긍정적 반응에서 수련생만족에 유의한 영향을 미치는 것으로 나타났다. 다섯째, 수련생 감정반응의 하위변인인 긍정적 반응과 부정적 반응 모두에서 행동의도의 하위변인인 재구매의도와 추천의도에 유의한 영향을 미치는 것으로 나타났다. 여섯째, 수련생만족은 행동의도의 하위변인인 재구매의도와 추천의도에 유의한 영향을 미치는 것으로 나타났다. This study examined the effect of mixed martial arts gym servicescape on trainee``s emotional response, satisfaction, and action intention. The research was made with 311 trainees from Seoul, and Gyeonggi province. Survey data were collected through survey questionnaires using purposive sampling method and were processed by means of frequency analysis, exploratory factor analysis, correlation analysis, and regression analysis using SPSS 18.0 program. The results of this study based on above methods and procedures were as followings. First, esthetics factor, space arrangement, convenience, facilities all sub factors of servicescape had significant influence on positive response sub factor of emotional response. However, convenience had significant influence on negative response. Second, esthetics factor, and space arrangement sub factors of servicescape had significant influence on positive response sub factor of emotional response. Third, esthetics factor, space arrangement, and facilities sub factors of servicescape had significant influence on repurchase intention. Meanwhile, esthetics factor, space arrangement, and convenience had significant influence on recommendation intention. Forth, positive response sub factor of emotional response had significant influence on trainees`` satisfaction. Fifth, positive response and negative response sub factors of emotional response had significant influence on repurchase and recommendation intention sub factors of action intention. Sixth, trainees``s satisfaction had significant influence on repurchase and recommendation intention sub factors of action intention.