• 가족자원경영과 정책
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• 제13권3호
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• pp.59-84
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• 2009

The purpose of this study was to investigate the determinants of policy demand for elderly care in aged Korea. The data from the first wave of KLoSA (Korean Longitudinal Study of Ageing) aged over 45 were used (n=10,165). The major findings were as follows: First, human capital, social capital, and socioeconomic variables influenced on the expected demand for elderly care by government, controlling the expectations of future life and society. Second, the effects of determninants on the expected demand for elderly care by government varied by the level of human capital, social capital, and socioeconomic variables, including ADL and IADL, familial support by children, public transfers, and age. Based on the empirical results, the implications for welfare mix of elderly care were provided.

• 가족자원경영과 정책
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• 제22권1호
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• pp.79-98
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• 2018

The purpose of this study was to analyze the influence of a married adult on child-toparent and on parent-to-child financial supports. The data, derived from Korean General Social Survey(KGSS) was obtained from the Survey Research Center at Sung Kyun Kwan University. The samples included 367 married adult children who had more than one living parent. Multiple regression analysis was used to analyze the research model. The findings from the analysis showed that monthly household income had no significant impact on the financial supports that adult children provided to their parents or that the parents provided to their child. The expectation of financial supports from their parents in the future was a important factor that affected the level of female and male children's financial supports that they received from their parents. The level of instrumental supports from their parents and their parents-in-law did influence the level of financial transfers between them. These results showed that financial transfers between married adult children and their parents differed based on the children's attitude towards the supporting parents, and whether or not the children or parents had alternative resources available to them for financial supports. Moreover, the variation in financial supports and benefits showed complex differences based on the gender of the children, and based on whether the financial support was coming from the respondent's parents or their partner's parents.

• Journal of Communications and Networks
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• 제12권1호
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• pp.52-66
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• 2010

Since large objects consume substantial resources, web proxy caching incurs a fundamental trade-off between performance (i.e., hit-ratio and latency) and overhead (i.e., resource usage), in terms of caching and relaying large objects to users. This paper investigates how and to what extent the current dedicated-server based web proxy caching scheme is affected by large file transfers in a high bandwidth campus network environment. We use a series of trace-based performance analyses and profiling of various resource components in our experimental squid proxy cache server. Large file transfers often overwhelm our cache server. This causes a bottleneck in a web network, by saturating the network bandwidth of the cache server. Due to the requests for large objects, response times required for delivery of concurrently requested small objects increase, by a factor as high as a few million, in the worst cases. We argue that this cache bandwidth bottleneck problem is due to the fundamental limitations of the current centralized web proxy caching model that scales poorly when there are a limited amount of dedicated resources. This is a serious threat to the viability of the current web proxy caching model, particularly in a high bandwidth access network, since it leads to sporadic disconnections of the downstream access network from the global web network. We propose a peer-to-peer cooperative web caching scheme to address the cache bandwidth bottleneck problem. We show that it performs the task of caching and delivery of large objects in an efficient and cost-effective manner, without generating significant overheads for participating peers.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2001년도 봄 학술발표논문집 Vol.28 No.1 (A)
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• pp.355-357
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• 2001

HTTP/1.1 standard reduces latencies and overhead from closing and re-establishing connections by supporting persistent connections as a default, which encourage multiple transfers of objects over one connection. HTTP/1.1, however, does not define explicitly connection-closing time but specifies a certain fixed holding time model. This model may induce wasting server’s resource when server maintains connection with the idle-state client that requests no data for a certain time. This paper proposes the mechanism of a heuristic connection management supported by the client-side under persistent HTTP, in addition to HTTP/1.1’s fixed holding time model on server-side. The client exploits the tag information within transferred HTML page so that decides connection-closing time. As a result, the mechanism allows server to use server’s resource more efficiently without server’s efforts.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.203-206
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• 2005

This paper presents a design experience of supervisory control system for agile and intelligent manufacturing(AIM). For effectively program job instructions, a Petri net-type graphical language is proposed and it can be applied to a various task such as concurrency and synchronization. PGL is consisted of PGL editor, PGL analyzer and PGL translator; PGL editor generates a job instruction program using graphic symbol. PGL analyzer prevents a deadlock or resource allocation of unit cell. PGL translator transfers to adequate sequential job commands of each unit cell.

• 대한임베디드공학회논문지
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• 제9권3호
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• pp.165-171
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• 2014

In this paper, we propose the hardware and software of a test-bed of a hovering AUV (autonomous underwater vehicle). Test-bed to develop as the underwater robot for the hovering -type is planning to apply for marine resource development and exploration for deep sea. The RTU that controls a azimuth thruster and a vertical thruster of test-bed is a intergrated-type thruster. The main control unit that collects sensor's data and performs high-speed processing and controls a movement of test-bed is a underwater hybrid navigation system. Also it transfers position, posture, state information of test-bed to the host PC of user using a wireless communication. The host PC checks a test-bed in real time by using a realtime monitoring system that is implemented by LabVIEW.

• 한국정보처리학회논문지
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• 제7권1호
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• pp.74-87
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• 2000

본 논문에서는 초고속 통신망인 Myrinet을 기반으로 하는 워크스테이션 연동(network of workstations) 환경하에서 병렬 프로그래밍 모델을 지원하는 PVM (parallel virtual machine)의 통신 성능 개선 방안을 제시한다. PVM을 위해 새로이 제안하는 Myrinet 기반 통신 모델은 커널을 경유하는 기존의 UDP/IP 프로토콜을 이용하는 통신 모델과 Myrinet API를 직접 이용하는 통신 모델을 혼합한 복합 통신 모델이다. 제안된 복합 통신 모델은 사용자 영역(커널)에서 커널(사용자) 버퍼로의 메시지 복사 부하를 제거하고 커널내의 프로토콜 스택 처리를 위한 통신 지연 요인을 감소시키므로, Myrinet상에서 보다 빠른 PVM 테스크간의 데이터 전송 속도를 보장한다. 또한, UDP/IP를 사용하는 기존 PVM에 본 논문에서 제안된 Myrinet 기반 복합 통신 모델을 적용시킨 EPVM (Enhanced PVM)을 구현하고, 이의 성능을 측정하였다. 실험 결과 EPVM의 통신 성능이 기존 PVM 보다 평균 1.5배 정보 우수하다는 것을 확인하였다.

• 대한가정학회지
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• 제48권4호
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• pp.83-102
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• 2010

본 연구는 노인부양에 관한 부부간 의사결정 과정에서 부양의 주체인 여성 배우자의 의사결정 파워가 실제 노인부양참여를 위한 결정에 어떤 역할을 하고 있는지 알아보기 위하여 미국내 중고령층을 대상으로 한 2002년 HRS(Health and Retirement Study) 자료를 사용하여 실증분석하였다. 또한 이 연구에서는 배우자 양쪽의 부모로부터 동시에 부양의 역할이 요구되었을 때 부부간 교섭력(Bargaining Power)을 대표할 수 있는 여성의 경제력과 교육수준이 부양결정에 어떤 영향을 미치는지를 다항 로짓 분석 (Multinomial Logit) 분석을 사용하여 검증하였다. 분석결과는 부부의 노부모 부양결정은 부부간 교섭력 보다는 양쪽 부모의 상대적 건강상태, 재정상태, 그리고 간호를 위한 대체 인적자원의 여부등에 의존하는 것으로 밝혀졌다. 또한 남성과는 다르게, 여성의 연령과 노동참여는 여성 자신의 노부모 부양결정에 결코 부적 영향을 주지 않았으며, 또한 양쪽 부모로 부터 동시에 부양참여가 요구되었을때 성인자녀가족의 부양결정은 같은 조건이라면 여성배우자쪽 부모의 부양에 보다 더 적극적으로 반응하는 것으로 밝혀졌다.

• Asian-Australasian Journal of Animal Sciences
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• 제12권8호
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• pp.1188-1191
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• 1999

Primordial germ cells (PGCs) of White Leghorn chicken embryos as a donor were transferred to Rhode Island Red chicken embryos as a recipient. At 48-50 h (stage 13-15) of incubation of fertilized eggs, donor PGCs, which were taken out from blood vessels of donor embryos, were injected into blood vessels of recipient embryos. Sex of the treated embryos was determined after the transfer of PGCs using remaining blood samples. In the present experiments, survival rate of the treated embryos was 33.3% for homo-sexual and 35.4% for hetero-sexual transfers of PGCs, respectively, when determined at 17 days of incubation. In this study, most of the treated embryos could not survive more than 18 days of incubation, though the reason for that was not clarified in the present work. The gonalds removed from embryos that died after 18 days of incubation and the organs from newly hatched chicks were examined for morphological and histological features. The gonads removed from the embryos with homo-sexual transfer of PGCs showed normal development in appearance. On the contrary, some (35.3%) of the embryos with hetero-sexual transfer of PGCs possessed abnormal gonads similar to ovotestis by histological observation. In cases where the gonads developed to be normal organs (64.7%) the sex of embryos was the same as recipient ones. The present results suggest that hetero-sexual transfer of the PGCs may bring about the possibility of development of the embryos bearing sexually different gametes, spermatogonia or oogonia.

• 가족자원경영과 정책
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• 제12권1호
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• pp.57-89
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• 2008

Using the data of 'middle-and old-aged people' in the 6th year(2003) of KLIPS(Korea Labor and Income Panel Study), this study compared entirely retired men's income source and amount of income divided by the time of retirement and analyzed the determinants of main income source and amount of income level using Multinomial Logit Analysis and Tobit Analysis. The results of these were as following; First, Entirely retired men has average 1.27 income source and the amount of income from main income source is positioned at 85% of total income. This result indicates the lack of variety to get opportunities of income sources for the living and also means high risk associated with the entirely retired men if he looses the main income source. Second, most of income source of entirely retired men is spouse's earned income or private income transfers, however, if we divide those as timing of retirement and characters of each individual, it is represented that the most of income source is differentiated by the position at labor market during work life and the opportunity for building the wealth, and the possibility of obtaining public pension and public support. Third, the income level depends on what sort of income source the retired men has, this shows that there is not a strong relationship between obtaining a Income source and gaining above the certain level of income.