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전하소법으로 합성한 $(1-x)Pb(Fe_{1/2}Nb_{1/2})O_3-xPbTiO_3$의 구조와 유전성질에 대한 연구
홍영식,박휴범,김정,김건,김시중,Hong, Young-Sik,Park, Hyu-Bum,Kim, Jeong,Kim, Keon,Kim, Si-Joong 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.11
Pb(Fe1/2Nb1/2)O3 and (1-x)Pb(Fe1/2Nb1/2)O3-xPbTiO3 ceramics were prepared by the precalcination method. Their structural and dielectric properties were investigated. The amount of perovsikte phase was increased by the precalcination and the dielectric properties of ceramics were improved. Additions of PbTiO3 were found to increase the tetragonality (c/a) of crystal lattice and Tc. In the middle region of (1-x)Pb(Fe1/2Nb1/2)O3-xPbTiO3, duffuse phase transitions (DPT) were observed.
$Na^+/La^{3+}$이온으로 치환된$Pb(Mg_{1}{3}Nb_{2}{3})O_3$의 구조 변화 및 유전 성질
홍영식,박휴범,안태호,김시중,Hong, Young-Sik,Park, Hyu-Bum,Ahn, Tae-Ho,Kim, Si-Joong 대한화학회 1996 대한화학회지 Vol.40 No.9
$ABO_3$계 perovskite 구조에서 A자리의 $Pb^{2+}$ 이온이 $Na^+La^{3+}$혼합 이온 으로 0-50mol.%치환된 $Pb_{1-x}(Na_12/La_12)_x(Mg_13/Nb_23/)O_3$ 화합물의 구조변화와 유전 성질을 X-선 회절법, 작외선과 라만 분광법, LCR meter등으로 연구하였다. $Na^+La^{3+}$혼합 이온의 치환량과 소결 온도가 증가함에 따라 perovskite 상의 양이 증가하였다. 치환량이 증가할 때 1:1 질서화에 의한 초격자선을 X-선 회절법으로 발견할수 없었지만, 라만 분광법과 이완성 매개변수의 증가로부터 A자리 양이온의 크기감소가 질서화에 영향을 미침을 알 수 있었다. Pb_{1-x}(Na_12/La_12)_x(Mg_13/Nb_23/)O_3$의 유전 성질은 perovskite 상의 양과 낟알 크기 및 밀도에 의해 영향을 받았고, 치환량이 증가할 때 상전이는 확산되었으며 상전이 온도는 감소하였다. The structural changes and dielectric properties of Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 compounds substituted by 0∼50 mol.% of Na+/La3+ mixed ions were investigated by X-ray diffraction method, IR and Raman spectroscopy, and LCR meter. The amount of perovskite phase increased with the increases of Na+/La3+ substituents and sintering temperatures. Although the superlattice lines due to 1:1 ordering were not detected by X-ray diffraction method, it was found, from the Raman spectroscopy and the increase of diffuseness coefficient, that the ordering behavior was related to the decrease of A site ion size. Dielectric properties in Pb1-x(Na1/2La1/2)x(Mg1/3Nb2/3)O3 were affected by the amount of perovskite phase, grain size, and density. The phase transitions were broadened and phase transition temperatures were lowered by the increase of Na+/La3+ ions.
K항공사 기내서비스 중요도에 대한 노선별 비교분석 연구
홍영식 ( Young Sik Hong ),김세규 ( Sae Kyu Kim ) 한국항공경영학회 2011 한국항공경영학회 추계학술대회 Vol.2011 No.-
The ongoing development of in-flight services is an integral part of an airline`s success. This study has conducted a survey on 315 cabin crew on the importance of service contents in different flight routes for the enhancement of airline service quality. Based on the result of the survey, First, it was confirmed that among the contents of in-flight service, the importance of individual service factors which comprise physical and human service are different in each flight routes. Second, there were disparities in the importance of each physical service factors in different flight routes, except in-flight entertainment. Finally the analysis on the characteristics of in-flight service in each different flight routes by way of detailed analysis centered on services such as provision of information, emotional response, service manner, service ability, and customized service showed that there were disparities of importance in flight routes in the fields of information provision, emotional response, and customized service, except service manner and service ability which can be said to be a basic qualification of a flight attendant.
마이크로 컴퓨터에 있어서 Sort/Merge package 개발에 따른 I/O 문제.
홍영식(Hong Young Sik) 한국정보과학회 1978 정보과학회논문지 Vol.5 No.2
When the list of data to be sorted is too large to fit into primary memory, the concerns of a sort/merge designer increase considerably. This paper describes the attendant considerations of floppy-disc I/O and CPU balance, blocking and buffer techniques, determination of the merge order in developing sort/merge system for the micro computer. The efficiency of the sort process must be measured in terms of the total amount of time required to read, sort and write all data elements.
홍영식 ( Young-sik Hong ),노승용 ( Seungyong Rho ) 가톨릭대학교 정부혁신생산성연구소 2018 정부와 정책 Vol.10 No.2
이 연구는 정부의 국민통합 기능 강화를 위해 근거에 기반한 객관적 논의와 실천가능한 다양한 대안 마련과 추진이 필요하다는 인식하에, 신문기사에서 국민통합과 사회통합이라는 용어가 어떻게 활용되고 있는지를 분석하였다. 분석 결과에 따르면, 국민통합과 사회통합을 사전적으로 정의하는 것보다는 현재 언론에서 이들을 어떻게 인식하고 있는지에 현상을 이해할 수 있다. 즉, 국민통합은 다소 정치적인 이슈로 이해되고 있고, 사회통합은 다양한 집단 간의 갈등과 이에 대한 해결을 모색하는 방향으로 전개되고 있는 것으로 평가된다. 현재 “국민통합” 및 “사회통합”영역에서 다양한 이슈가 존재하며 양자 간에 공통으로 논의되는 부분도 많지만, “사회통합”에서 다루고 있는 “통합이 필요한 영역”에 대한 논의가 더 많은 것은 사실이다. 대표적인 문제가 다문화 영역이다. This study analyzed how the terms of national integration and social integration are utilized in the newspaper articles, with the objective that it is necessary to establish objective arguments for the strengthening of the national integration function and to prepare and implement various practical alternatives. According to the results of the analysis, rather than prescribing national integration and social integration in a pragmatic way, it is possible to understand the phenomenon in how the media now perceives them. In other words, it is understood that national integration is a rather political issue, and that social integration is being developed in the direction of finding conflicts among various groups and solving them. There are various issues in the area of “national integration” and “social integration”, and there are many parts that are commonly discussed by both parties. However, it is true that there is more discussion about the “area where integration is needed” and a typical problem is multiculturalism.
홍영식(Yong Sik Hong),조유근(Yookun cho) 한국정보과학회 1986 정보과학회논문지 Vol.13 No.2
주어진 n개의 task들이 각각 release 시간, deadline 및 처리시간을 갖는 경우에 이들 task들을 속도가 서로 다른 m개의 기계에 프리엠프티브(preemptive) 스케쥬링하는 동기식 병행 알고리즘이 제시되었다. 주어진 task 스케쥬링 문제를 flow 네트워크로 변환하고 효과적인 병행 최대 flow 알고리즘을 얻기 위해서 sorted리스트를 사용하였다. 이 알고리즘은 O(n²)의 프로세서를 사용하여 O(m²n³logn+n⁴logn) 시간에 수행된다. 또한 전제된 병행처리 시스템은 공동기억장치(Shared memory)를 갖는 시스템이다. Given n jobs, each of which has a release time, a deadline, and a processing requirement, a synchronized parallel algorithm for a preemptive schedule on m uniform machines is presented. The given scheduling problem IS transformed into the corresponding network flow problem. We used the sorted list to obtain an efficient parallel max-flow algorithm. This algorithm runs in O(m² n³ logn+n⁴ logn) time and uses O(n²) processing elements. The shared memory model of parallel computers is used.