• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
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• pp.765-768
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• 2005

This study is investigated the strength properties of ALC(Autocalved Lightweight Concrete) using SPS(Stone Powder Sludge), to develop recycling technique of SPS. At a given replacement percent of SPS and addition percent of foam, the results show that its the strength properties are equal or higher than the quartz used in a raw material of ALC, and it is also found that the addition percent of the foam and the strength properties have a certain relation of linear.

• 한국세라믹학회지
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• 제46권4호
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• pp.345-349
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• 2009

In Part II, the paper will describe a three-phase alumina-based nanoceramic composite demonstrating superplasticity at a surprisingly lower temperature and higher strain rate. One important factor in the processing of these nanocomposites was the use of the electrical field assisted sintering method, SPS. These improvements in mechanical properties were briefly discussed in the context of the results from the microstructural investigations. SPS forming approach provides a new route for low temperature and high-strain-rate superplasticity for nanostructured materials and should impact and interest a broad range of scientists in materials research and superplastic forming technology.

• 토지주택연구
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• 제3권4호
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• pp.389-397
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• 2012

In this study, crosshole seismic test, donwhole seismic test, SPT uphole test, and suspension PS logging (SPS logging) were conducted and the shear wave velocities of these tests were compared. The test demonstrated the following result: Downhole tests showed similar results compared to those of crosshole tests, which is known to be relatively accurate. SPS logging showed reliable results in the case of no casing, i.e. in the rock mass, while, in the case of soil ground, its values were lower or higher than those of other tests. SPT-uphole tests showed similar results in the soil ground and upper area of rock mass compared to other methods. However, reliable results could not be obtained from these tests because SPT sampler could not penetrate into the rock mass for the tests.

• 한국분말야금학회:학술대회논문집
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• 한국분말야금학회 2006년도 Extended Abstracts of 2006 POWDER METALLURGY World Congress Part2
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• pp.1292-1293
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• 2006

A non-equilibrium powder metallurgy processing such as an MA/SPS (Mechanical Alloying / Spark Plasma Sintering) process is examined in a Ti-48moll%Al. TiAl intermetallic compound is a potential light-weight/high-temperature structural material. One of the major problems, however, limiting the practical use of the material is its poor workability. From this point, the powder metallurgy (PM) processing route has been attractive alternative of the conventional processing for such material The MA/SPS process is able to apply to a LIGA process. Optimization of the pseudo-superplasticity enables to fabricate micro-parts made of fine grained ceramics composites of TiAl by the LIGA process.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 추계학술발표논문집 (중)
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• pp.925-928
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• 2002

네트워크의 규모가 방대해지고 복잡해지면서 IP 주소 부족문제와 그에 따르는 보안문제가 중요시되어 지고 있다. 여기에서 IPv4/IPv6 변환 기술인 NAT-PT 는 구조적 특성상 보안에 대한 메커니즘을 제공하지 못한다. 즉, 종단간 IPSec 보안은 다른 주소 영역사이(IPv4-IPv6)를 교차하는 것이 불가능하기 때문이다. 따라서 이 논문에서는 이를 해결하기 위해 NAT-PT 와 SPP 가 결합된 SPS 환경에서의 정책협상을 위한 정책기반 보안 메커니즘을 제안 한다.

• Bulletin of the Korean Chemical Society
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• 제35권4호
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• pp.1177-1181
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• 2014

A 2D grid-like (4, 4)-connected topology coordination polymer, $[Co(BTA)_2(H_2O)_2]_n$ (1), where HBTA = 2-(1H-benzotriazol-1-yl)acetic acid, has been synthesized by hydrothermal method and characterized by single crystal X-ray diffraction, IR spectroscopy, elemental analysis and surface photovoltage spectroscopy (SPS). X-ray diffraction analyses indicated that 1 displays octahedral metal centers with secondary building units (SBUs) [$Co(BTA)_2(H_2O)_2$] bridged by the $BTA^-$ ligands. In the crystal, the 2D supramolecular architecture is further supported by $O-H{\cdots}O$, $O-H{\cdots}N$, $C-H{\cdots}O$ hydrogen bonds and ${\pi}{\cdots}{\pi}$ stacking interactions. The SPS of polymer 1 indicates that there are positive response bands in the range of 300-600 nm showing photo-electric conversion properties. There are good relationships between SPS and UV-Vis spectra.

• Journal of Positioning, Navigation, and Timing
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• 제10권1호
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• pp.43-48
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• 2021

Most existing studies on the wide-area differential global positioning system (WADGPS) used standard positioning service (SPS) receivers in their observation reference stations which provide the central control station global positioning system (GPS) measurements to generate augmentation data. In the present study, it is considered to apply a precise positioning service (PPS) receiver to an observation reference station which is located in the threatened jamming area. Therefore, the reference station network consists of a PPS receiver based observation reference station and SPS receiver based observation reference stations. In this case, to maintain correction performance P1C1 differential code bias (DCB) should be compensated. In this paper, P1C1 DCB estimation algorithm was applied to the PPS/WADGPS system and performance test results using measurements in the Korean Peninsula were presented.

• Journal of Positioning, Navigation, and Timing
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• 제12권3호
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• pp.307-314
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• 2023

Wide-Area Differential Global Positioning System (WADGPS) is a system that operates a number of reference stations to provide correction information to improve the accuracy of GPS users, and it is available to service users within the area where the wide-area reference stations are installed. Recently, as positioning information has been used in various applications, the need for WADGPS for precise navigation in long-distance spaced areas where the wide-area reference stations cannot be installed has been raised. This paper tested the user navigation performance outside the wide-area reference stations of the WADGPS system, which serves both GPS Precise Positioning Service (PPS) and Standard Positioning Service (SPS) users. Static and dynamic tests were conducted using vehicles, and as a result, position accuracy improvement through WADGPS was confirmed even at points hundreds of kilometers outside the network area of the wide-area reference stations. Through this, the performance of the PPS/SPS correction system and the possibility of expanding the service area were confirmed.

• 한국사회복지학
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• 제50권
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• pp.235-263
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• 2002

경로연금은 급여수준이 미미하고 제도규모도 크지 않지만, 공적연금과 공공부조로부터 배제된 저소득 노령계층에게 유일한 공적소득보장제도라는 점에서 중요한 제도적 위상과 역할을 갖고 있다. 특히 공적연금이 미성숙한 현단계에서 경로연금의 역할은 더욱 중요하다. 이러한 경로연금이 지금 중요한 정책기로에 서 있다. 국가정책 차원에서 경로연금 수급자를 매년 증가하여 책정해도 실제 수급자 규모는 이에 훨씬 미치지 못하고 있는 반면, 공적소득보장의 사각지대에 놓여진 노령계층의 경제적 어려움은 여전하다. 본 논문에서는 왜 노령소득보장체계상에 욕구와 자원의 부정합(mis-matching) 문제가 심각하게 발생하고 있는지에 대해 문제의식을 가지고, 보다 근본적으로 향후 인구고령화의 가속화, 노동시장의 유연화, 가족구조의 변화 등 경제사회적 여건의 질적 변화에 부합하는 노령소득보장체계의 재편방향을 모색하는 가운데 과연 경로연금이 어떠한 방향으로 발전하는 것이 바람직할 것인가를 모색해 보고자 하였다. 본 논문에서 노령소득보장체계가 갖추어야 할 원칙적인 기본방향을 크게 다음 세 가지로 정리하였다. 보편적 개별보장(universal and individual security)의 원칙; 지속가능성(sustainability)의 원칙; 형평성(equity)의 원칙. 이러한 대원칙하에서 본 논문은 경로연금제도의 발전방향을 크게 두 가지로 제안하였다. 하나는 현행 경과적이고 한시적인 제도의 틀을 유지하면서 제도의 충실화를 기하는 방향이고, 다른 하나는 경로연금제도를 공적연금과 공공부조의 사각지대에 놓여질 노령계층의 공적소득보장제도로서의 역할을 지속하는 방향이다. 이 때 경로연금의 발전방향을 결정짓는 중요한 변수는 공적연금의 역할이다. 만일, 공적연금이 현행 1소득자 1연금 체계로 계속 운영된다면 경로연금과 같은 무갹출연금적 성격의 제도는 계속 존속할 필요가 있다. 그러나 만일 공적연금이 1인 1연금의 틀을 갖춘 기초연금과 소득비례연금으로 재편되어 기초연금이 실질적으로 전노령계층에 대한 기초보장의 역할을 담당하게 된다면, 경로연금은 본래 제도의 목적대로 공적연금 성숙기까지 한시적으로 운영되는 현행 제도의 틀을 유지하는 것이 바람직할 것이다. 즉, 공적연금이 실질적인 전국민 기초보장의 역할을 할 수 있는가의 여부에 경로연금 발전방향의 향배가 달려 있다고 하겠다.