• The Journal of the Petrological Society of Korea
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• v.26 no.4
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• pp.373-384
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• 2017

A new era with the $4^{th}$ Industrial Revolution certainly brings new opportunities for human to explore human's activities outside of the Earth. After the Apollo program, exploration for lunar resources and establishment of lunar base seem to be in reality. This could be due to new findings by the LCROSS and LRO proving the advanced scientific development and new scientific results about the moon from Asian countries including China with Chang'E missions. It is expected that fossil fuels will be in shortage in the near future and at this time, Helium-3 could be an energy resource as a replacement of the fossil fuels. At present it is well known that countries like Russia, USA, and Europe will continue to investigate on lunar exploration especially with landers toward future human activities on the moon to establish a lunar base. With this point of view, it is important for human to understand lunar resources and prepare for prospective utilization of lunar resources. This review paper considers on a point of view in both lunar resource exploration and establishment of lunar base.

• KSCI Review
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• v.1 no.2
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• pp.73-94
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• 1995

In this paper, design of efficient NDB(Network Data Base) for the activation plan of chain information network. The DB structure build up, logical structure, store structure, physical structure, the data express for one's record, and the express using linked in the releation of data. Also express as hierarchical model on the DSD(Data Structure Diagram) from the database with logical structure. Each node has express on record type, the linked in course of connective this type, the infuence have efficent of access or search of data, in the design for connection mutually a device of physical, design for database, and construction a form of store for logical. Also activation of chain information network of efficent, using POS(Point Of Sale) system in OSI(Open Systems Interconnection) environment for network standardization, and build up network a design for system.

• Journal of Korean Ophthalmic Optics Society
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• v.3 no.1
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• pp.33-37
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• 1998

Lens centration was the fitting variable that was most dependent on base curve radius. Flatter lenses tended to decenter more. A flatter contact lens will likely have to move into the periphery to reach this point of stability. In most cases, the decentration was in the superior and/or temporal direction. It was also found that comfort complains were more common with flatter lenses. The optimal fits was highest with the 8.4mm base curve lens for all three ranges fit eyes decreased as base curve radius was increased. These lenses with steeper radii lead to better centration and therefore to better fit and comfort for more patients than do thin lenses with flatter radii.

• Journal of Korea Society of Digital Industry and Information Management
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• v.13 no.4
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• pp.33-40
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• 2017

Internet of Vehicles (IoV) is a subset of Internet of Things (IoT) and it is an infrastructure for vehicles. Therefore, IoV consists of three main network including inter-vehicle network, intra-vehicle network, and vehicular mobile internet. IoV mainly used in urban traffic environment to provide network access for drivers, passengers and traffic management. Accordingly, many research works have focused on network technology. But, recent concerted efforts in academia and industry point to paradigm shift in IoV system. In this paper, we proposed a knowledge base for intelligence service in IoV. A detailed design and implementation of the proposed knowledged base is illustrated. We hope this work will show power of IoV as a disruptive technology.

• Korean Journal of Mathematics
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• v.23 no.1
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• pp.29-36
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• 2015

A signed digraph S is the digraph D by assigning signs 1 or -1 to each arc of D. The base of S is the minimum number k such that there is a pair walks which have the same initial and terminal point with length k, but different signs. In this paper we show that for $n{\geq}5$ the upper bound of the base of a primitive non-powerful signed tournament Sn, which is the signed digraph by assigning 1 or -1 to each arc of a primitive tournament $T_n$, is max{2n + 2, n+11}. Moreover we show that it is extremal except when n = 5, 7.

• Speech Sciences
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• v.8 no.4
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• pp.59-72
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• 2001

In this paper, we experimented with speaker change detection that uses a statistical method for NOD (News On Demand) service. A specified speaker's change can find out content of each data in speech if analysed because it means change of data contents in news data. Speaker change detection acts as preprocessor that divide input speech by speaker. This is an important preprocessor phase for speaker tracking. We detected speaker change using GLR(generalized likelihood ratio) distance base division and BIC (Bayesian information criterion) base division among matrix method. An experiment verified speaker change point using BIC base division after divide by speaker unit using GLR distance base method first. In the experimental result, FAR (False Alarm Rate) was 63.29 in high noise environment and FAR was 54.28 in low noise environment in MDR (Missed Detection Rate) 15% neighborhood.

• Journal of ILASS-Korea
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• v.10 no.1
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• pp.35-42
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• 2005

The present study has numerically and experimentally investigated the spray behavior of liquid jet injected in subsonic cross-flow. The corresponding spray characteristics are correlated with jet operating parameters. The spray dynamics are known to be distinctly different in the three regimes: the column, the ligament and the droplet regimes. The behaviors of column, penetration and breakup of liquid jet have been studied. Numerical and physical models are base on a modified KIVA code. The primary atomization is represented by a wave model base on the KH(Kelvin-Helmholtz) instability that is generated by a high interface relative velocity between the liquid and gas flows. In odor to capture the spray trajectory, CCD camera has been utilized. Numerical and experimental results indicate that the breakup point is delayed by increasing gas momentum ratio and the penetration decreases by increasing Weber number.

• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.390-395
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• 2009

In this paper, we present practical issues in a Mobile Haptic Interface (MHI) and their improvements. The improvements can be categorized in three parts: 1) high-accuracy estimation of the world position of the haptic interface point, 2) motion planning algorithm to move the mobile base while avoiding collisions with the user and other objects, and 3) closed-loop force control to compensate the undesired effect of mobile base dynamics on the final rendering force perceived by the user.

• Journal of Advanced Marine Engineering and Technology
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• v.30 no.2
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• pp.247-252
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• 2006

Almost ship monitoring systems are event driven alarm system which warn only when the measurement value is over or under set point. These kinds of system cannot warn until signal is growing to abnormal state that the signal is over or under the set point. therefore cannot play a role for preventive maintenance system. This paper proposes fault diagnosis method which is able to diagnose and forecast the fault from present operating condition by analyzing monitored signals with present ship monitoring system without any additional sensors. By analyzing the data with high correlation coefficient(CC), correlation level of interactive data can be defined. Knowledge base of abnormal detection can be built by referring level of CC(Fault Detection CC. FDCC) to detect abnormal data among monitored data from monitoring system and knowledge base of diagnosis built by referring CC among interactive data for related machine each other to diagnose fault part.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2001.11a
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• pp.355-365
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• 2001

본 논문은 현재 국내에서 개발되고 있는 인증서 발급 시스템에서 인증서가 취소되었을 경우에 발급되는 인증서 취소목록(Certificate Revocation List : CRL)에 따른 문제점 중, 유통되는 트래픽 부하를 줄이고, 발급되는 CRL의 크기를 감소시키며, 또한 전체 CRL의 발급 시간을 연장시킬 수 있는 Delta-CRL 발급 시스템의 정책, 운영 방안 및 발급 방법을 제시한다. 제안된 운영 방안은 Full-CRL의 Distribution Point를 이용하여 Base-CRL을 가리키고 Base-CRL의 Delta-CRL distribution point를 이용하여 Delta-CRL의 위치를 확인한다. 그리고 세 가지 Delta-CRL 발급 시스템의 동작 방법들을 분석하였다.