Dual Core 시스템에서 Shared Memory 기능 구현

장승주(Seung-Ju Jang) 한국콘텐츠학회 2008 한국콘텐츠학회논문지 Vol.8 No.9

Linux에서 사용되는 Shared Memory는 동일한 메모리 영역에 여러 개의 프로세스가 접근할 수 있도록 해 주는 기술이다. 본 논문은 Linux 운영체제에서 지원해 주는 System V의 IPC 중 하나인 Shared Memory를 Dual Core 시스템 상에서 동작하도록 구현한다. 본 논문에서는 커널 단계에서 처리되는 SVR(System V Release) 형식의 Shared Memory를 다룬다. 기존의 공유메모리 방식은 단일 처리기를 이용한 방식이다. 본 논문에서는 dual core를 이용하여 공유메모리 처리를 할 수 있는 시스템을 제안한다. 본 논문에서 제안하는 Dual Core 시스템에서 공유 메모리 기능 구현은 기존의 단일 처리기 시스템에서보다 성능을 향상시킬 수 있도록 한다. 공유 메모리를 이용한 프로세스의 동작이 별개의 CPU에서 동작되도록 함으로써 성능 향상을 꾀한다. This paper designs Shared Memory on the Dual Core system so that it operates a general System V IPC on the Linux O.S . Shared Memory is the technique that many processes can access to identical memory area. We treat Shared Memory which is SVR in a kernel step. We design a share memory facility of Linux operating system on the Dual Core System. In this paper the suggesting of share memory facility design plan in Dual Core system is enhance the performance in existing an unity processor system as a dual core practical use. We attemp a performance enhance in each CPU for each process which uses a share memory.

핵심자기평가, 동료신뢰, 상호의존성이 가상협업역량의 조절효과와 함께 원격근무자의 지식공유에 미치는 영향에 관한 연구

진한규(Han Kyu Jin),김영경(YoungKyoung Kim),이정우(Jungwoo Lee) 한국경영학회 2021 經營學硏究 Vol.50 No.3

With the advance of information technology, remote work is increasingly adopted as a standard practice in the field. This study explores the underlying mechanism of knowledge sharing in a remote work environment. Via literature review, core self-evaluation, co-worker trust, social interdependence, and individual virtual competence are identified as critical antecedents and performance and job satisfaction as outcomes of knowledge sharing. An empirical model is derived with individual virtual competence as the moderating construct of all the antecedents. Analysis of survey data collected from 178 workers with remote work experience revealed that affective co-worker trust and goal interdependence have a stronger influence on knowledge sharing than core self-evaluation and task interdependence. Interestingly, cognitive trust turns out to be insignificant in our sample. Moreover, the impact of affective co-worker trust, task interdependence, and goal interdependence on knowledge sharing is found to be strongly moderated by individual virtual competence, impacting job performance and job satisfaction. Task and goal interdependence needs to be carefully designed in a remote work environments in order to increase knowledge sharing among remote workers. Also, increasing affective trust by way of intermittent face-to-face meeting would benefit the performance and satisfaction. Future research and limitations are discussed at the end.

코아공유를 통한 노후 주거지역 과소필지의 소규모 정비 효과 및 활용 방안에 관한 연구 - 창신 · 숭인 도시재생지역을 중심으로 -

오인탁(Oh, In Tack),염상훈(Youm, Sang Hoon) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.6

In Korea, more than 50% of buildings are over 20 years old. In addition, in the case of houses, 45% of buildings that are more than 30 years old are rapidly deteriorating. Large-scale complete removal methods, which has been actively conducted since the 1970s, has been carried out without considering the regional characteristics or the historicity of the city. As a result, a repair-type maintenance method was introduced to induce small-scale development. However, there are lots that are difficult to develop under the conditions of the lot. These lots need cooperation with adjacent lots. Methods for development in cooperation with adjacent lots include maintenance through parcel-union or building agreements. The study of small maintenance was conducted on more than 90㎡ of land. Under parcel less than 90㎡, it occupies more than 15% of the core, so research on core-sharing is necessary. Therefore, the purpose of this study is to find out the characteristics that appear when small-scale maintenance is performed according to the number of lots that share cores in a dense area of undersized parcels, such as increasing the dedicated area and flat type and increasing the number of households, parking space, and utilizing external space. As a result of the study, if cooperative development is carried out through core-sharing, the exclusive area of 73.2~325㎡ can be used, and the type of residence varies according to the layout of the lot. In addition, it was found that the securing of parking spaces and the utilization of external spaces were also increased. Although cooperative development is still not actively carried out, this research is valuable in that it can bring great effects when cooperative development is carried out in at least two parcels.

A New Architecture to Offload Network Traffic using OpenFlow in LTE

VENMANI Daniel Philip,Yvon GOURHANT,Djamal ZEGHLACHE 한국산업정보학회 2012 한국산업정보학회논문지 Vol.17 No.1

Next generation cellular applications and smart phone usage generate very heavy wireless data traffic. It becomes ineluctable for mobile network operators to have multiple core network entities such as Serving Gateway and Packet Data Network Gateway in 4G-LTE to share this high traffic generated. A typical configuration consists of multiple serving gateways behind a load-balancer which would determine which serving gateway would service a end-users" request. Such hardware is expensive, has a rigid policy set and is a single point of failure. Another perspective of today"s increasingly high data traffic is that besides it is being widely accepted that the high bandwidth LTE provides is creating bottlenecks for service providers by the increasing user bandwidth demands without creating any corresponding revenue improvements, a hidden problem that is also passively advancing on the newly emerging 4G-LTE that nay need more immediate attention is the network signaling traffic, also known as the control-plane traffic that is generated by the applications developed for smartphones and tablets. With this as starting point, in this paper, we propose a solution, by a new approach considering OpenFlow switch connected to a controller, which gains flexibility in policy, costs less, and has the potential to be more robust to failure with future generations of switches. This also solves the problem of scaling the control-plane traffic that is imperative to preserve revenue and ensure customer satisfaction. Thus, with the proposed architecture with OpenFlow, mobile network operators could manipulate the traffic generated by the control-plane signaling separated from the data-plane, besides also reducing the cost in installing multiple core-network entities.

코아공유형 맞벽정비수법 모델화와 효과성 시뮬레이션

주영재(Joo, Young-Jae),박태원(Park, Tae-Won) 한국도시설계학회 2016 도시설계 : 한국도시설계학회지 Vol.17 No.5

마을만들기와 같은 전국적인 수복형 도시재생방법론에 대한 열기는 양적성장시기에 공공주도로 기존의 도시조직을 반영하기 어려운 철거형 도시정비수법에 대한 반성과 그 대안적 해법찾기의 긍정적 결과이다. 주거지 재생에 있어서 거주자의 자발적 의지를 유도하고 도시 및 거주환경성이 고려된 신중한 제도 및 정책이 필요한 시기이다. 따라서 본 연구는 일반적인 합필을 전제로 구성되는 철거형 개발에서 실현가능한 공유공간의 장점을 건축협정제도를 활용한 소단위 정비에 적용하여 도시조직을 보전하는 동시에 자력개발을 활성화 할 수 있는 정비모델을 제안하는 것을 목적으로 한다. 단위필지에 제한되는 계단공간을 두 개 이상의 필지에서 사용가능하도록 공유공간화 하였다. 소규모 가구와 필지가 밀집해있는 노후주거지를 대상으로 코아공유형 맞벽정비 모델을 제시하고 효과성을 검증하였다. 그 결과 용도별 용적을 초과하지 않는 범위 내에서 개별필지별 전용률을 높일 수 있었다. 더불어 단위필지의 형상 및 크기를 보전하여 지속가능한 토지이용 가능성을 높이고, 커뮤니티 활성화에 기여할 수 있는 필지단위 정비수법의 가능성을 검토하였다. The national boom to urban regeneration methodologies, such as Maeul-Mandeulgi is the positive result of finding alternative solutions and reflection of redevelopment methodology. Prudent policies that considered cities and dwelling environment performances as the willingness of residents is required to play in residential neighborhood regeneration. This study aim at suggesting lot-based housing renewal method that preserve the urban tissue and attract voluntary regeneration for applying public-interest in the building agreement such as streets and community facilities. Lot-based stair space is utilized by means of housing through stretch the meaning of public assets of urban. Conceptualization and effectiveness of the core-shared development methods are examined in pre-existing urban district concentrated small block and plot. As a result, the possibility of voluntary regeneration increased by additional area of exclusive use space every plot within the maximum Floor Area Ratio. The possibility of sustainable land-use is examined as lot-based urban tissue are preserved. Last, new low-rise housing type which contribute the community of solidarity and revitalization are examined.

Design and Implementation of Inter-core Communication of Embedded Multiprocessor Based on Shared Memory

Yang Nie,Lili Jing,Pengyu Zhao 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.12

In this paper, two Cortex-A9 processors and microblaze processor are used to build a multiprocessor embedded system. The whole system is connected AXI Interconnect, and the shared memory is used as a communication mechanism. Embedded multiprocessor system is mapped into FPGA, and the feasibility and practicability of the system are verified. Simulation result Indicate that shared memory provides very high performance and low latency access from both processors compared with the DDR memory.

The Issue of Information Exchanges Regarding Price under Competition Law

Yo Sop Choi(최요섭) 숭실대학교 법학연구소 2016 法學論叢 Vol.36 No.-

공정거래법 혹은 경쟁법에서의 카르텔은 현대 사회에 심각한 정도로 부정적인 영향을 미치고 있으며, 전 세계적으로 원칙적 금지의 대상이 된다. 특히 과점시장에서는 사업자들이 명시적 합의(explicit agreement) 및 묵시적 합의(implicit agreement)를 통해 카르텔을 형성하고 경쟁을 제한하려는 경향이 강하다. 따라서 우리나라를 포함하여 다수의 경쟁당국에서는 과점시장에서의 카르텔을 적발하기 위해 많은 노력을 기울이고 있다. 그러나 실제 명시적 합의가 아닌 경우, 합의의 추정과 관련하여 부당한 공동행위를 금지하고 있는 공정거래법 제19조의 적용에 어려움이 존재한다. 최근 가격정보교환 중심의 합의증명 문제와 관련하여 2015년 12월 대법원은 라면 제조사들이 라면 가격 인상일자 및 인상내용 등의 경쟁관련 주요 정보를 교환하였다는 사정만으로 가격을 부당하게 공동으로 인상하는 합의로 볼 수 없다고 판단하였다. 따라서 그 외의 관련 증거가 부족하여 공정거래위원회가 주장하는 가격인상합의가 있었다고 볼 수 없다는 내용으로 선고하였다. 이러한 대법원의 판결은 미국 및 유럽연합과 같은 외국경쟁법의 집행 및 판례법의 내용과 상이한 부분이 있다. 외국 경쟁법에서는 과점시장에서 가격과 같은 경쟁에서 중요한 정보의 교환은 합의 증거로 판단하고 있으며, 특히 유럽연합의 경우 위와 같은 내용의 정보교환행위 자체는 준당연위법(quasi-per se illegal)과 같은 방법의 경성제한금지(hard-core restrictions)로서 규제를 하고 있다. 따라서 현재 우리나라의 합의의 추론의 방법은 외국 경쟁당국에의 일반적인 접근 방법에 비하여 어느 정도 차이가 있다고 할 수 있다. 무엇보다 카르텔과 같은 경성제한행위에 대한 판결과 집행의 내용이 카르텔 형성 및 제한에 상당한 영향을 줄 수 있으므로 향후 위 판결의 내용을 중심으로 가격정보교환에 대한 합의의 문제에 대해서 연구하고 발전시킬 필요가 있다. 따라서 본 연구는 우리나라의 라면담합사건을 중심으로 미국 및 유럽연합의 관련 경쟁법의 내용을 비교하고 제언하는 것을 그 목적으로 한다. There is no doubt that cartels are one of the most harmful business practices, and most competition regimes have treated this conduct as a supreme evil. In particular, a hard-core cartel directly influences the social welfare because it creates market power through agreements, thereby extracting all consumer welfare. In most competition jurisdictions, there are two important elements for bringing a competition law case against a hard-core cartel: Proof of the existence of an agreement and of its prevention of competition. Likewise, the two-prong test lies at the heart of cartel enforcement. Regarding the requirements for evidence of an agreement, competition regimes have developed their own scrutiny tests. The Korean competition regime is not an exception. Article 19(1) MRFTA sets forth its prohibition of anti-competitive agreements between competing undertakings, and this provision proscribes any anti-competitive conduct by contract, agreement, resolution, or other means of considerable business practices. The Korean competition authority has vigorously enforced this legal measure against horizontal agreements that are concluded by competing economic entities. Nonetheless, the KFTC recently failed to bring direct evidence of the first criterion, the existence of an agreement. The Supreme Court of Korea annulled the judgment of the Seoul High Court and the decision of the KFTC on 24 December 2015, and it has raised some critical issues, such as the importance of direct evidence of an agreement and the market effect of the sharing of price information. In order to discuss the issue of information sharing, this article aims at providing an analysis of the ramen cartel, with a comparative study of the rules regarding the sharing of information on prices.

따뜻한 유아교육공동체 형성을 위한 구성원의 공통 핵심 역량 요소 탐색

정계숙,윤갑정,박희경 부산대학교 과학교육연구소 2016 교사교육연구 Vol.55 No.2

The purpose of the study was to examine the community members’ core competences for forming a ‘warm’ early childhood educational community as an ideal model of early childhood education. For this purpose, 6 people including parents, teacher, practician in the communal childcare cooperatives and 6 people including professors, directors teacher, school supervisor participated in the Focus Group Interview (FGI). The results were as follows: The first core competencies for developing a ‘warm’ early childhood educational community was sense of partnership which was characterized by; ‘understanding each other and warm hearted sympathy’, ‘a common purpose for children’s future’, ‘forgiveness and accepting each other’s differences’, and ‘meeting for building a positive relationship’. The second core competencies for developing a ‘warm’ early childhood educational community was sharing of key values between members which was characterized by; ‘establishment of self-identity and community identity’, ‘sharing perspectives and values on education’, ‘willingness for learning together in daily life’ and ‘democratic communication skill and decision-making ability’. Implications for the core competencies development and support toward building a warm early childhood educational community was discussed.

디지털 혁신공유대학 온라인 수업만족도 및 학습자의 핵심역량에 미치는 영향 분석

이현경 한국컴퓨터정보학회 2022 韓國컴퓨터情報學會論文誌 Vol.27 No.10

The purpose of this study is to investigate the learning satisfaction and perception of the students who have taken the online classes of the Digital Innovation Sharing University in the field of new energy industry, and to analyze the relationship between the learning satisfaction and core competencies. In order to achieve this purpose, the results of the learning satisfaction survey of a total of 470 students who took the digital innovation sharing university classes in the new energy industry were analyzed in both quantitative and qualitative methods. As a result of quantitative analysis, students' learning satisfaction was generally above average, and they were particularly satisfied with the setting and operation of educational goals. In addition, it was found that students' learning satisfaction had a statistically significant effect on students' core competencies. As a result of the qualitative analysis, it was possible to confirm the direction of improvement of the curriculum in the areas of function, operation, and content. Based on the results of this study, it is expected that the digital innovation sharing university curriculum quality management feedback system will be prepared in the future, and it will be the foundation for the continuous establishment of the curriculum quality management system. 이 연구의 목적은 에너지신산업 분야 디지털 혁신공유대학의 온라인 교육과정을 수강한 학생들을 대상으로 교육과정에 대한 온라인 수업만족도 및 인식을 조사하고, 학습자의 온라인 수업만족도와 핵심역량 간의 관계를 분석하는 것이다. 이러한 목적을 달성하기 위하여 에너지신산업 분야디지털 혁신공유대학 교육과정을 수강한 총 470명 학생들의 수업만족도 조사 결과를 양적, 질적방법으로 분석하였다. 양적 분석 결과, 학생들의 온라인 수업만족도는 대체로 보통 이상으로 나타났으며, 특히 교육목표 설정과 운영에 대한 만족도가 높았다. 또한 학생들의 온라인 수업만족도는학생들의 핵심역량에 통계학적으로 유의미하게 영향을 미치는 것으로 나타났다. 질적 분석 결과, 기능, 운영, 내용 영역에서 교육과정의 개선 방향을 확인할 수 있었으며, 구체적으로는 학습자-교수자 상호작용 활성화, 교육과정 체계성, 교육내용 질 제고 측면에서 교육과정 설계 및 개발이 중요하다는 점이 도출되었다. 이 연구 결과는 향후 디지털 혁신공유대학 교육과정 운영을 위한 환류 체계를 마련하고, 지속적인 교육과정 질 관리 시스템 구축을 위한 토대가 될 것으로 기대한다.

Performance Analysis of Shared Buffer Router Architecture for Low Power Applications

M. Deivakani,D. Shanthi 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.6

Network on chip (NoC) is an emerging technology in the field of multi core interconnection architecture. The routers plays an essential components of Network on chip and responsible for packet delivery by selecting shortest path between source and destination. State-of-the-art NoC designs used routing table to find the shortest path and supports four ports for packet transfer, which consume high power consumption and degrades the system performance. In this paper, the multi port multi core router architecture is proposed to reduce the power consumption and increasing the throughput of the system. The shared buffer is employed between the multi ports of the router architecture. The performance of the proposed router is analyzed in terms of power and current consumption with conventional methods. The proposed system uses Modelsim software for simulation purposes and Xilinx Project Navigator for synthesis purposes. The proposed architecture consumes 31 mW on CPLD XC2C64A processor.