• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.9
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• pp.3802-3807
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• 2011

In this study, in-plane and out-plane compression tests of aluminum foam and honeycomb sandwich composites were carried out. Through these tests, the relationships of load-displacements were analyzed and the compression characteristics were compared with each other. The specimens were compressed with the speed of 1mm/min by using the universal testing machine. Experimental procedures were taken with photograph by the camera and load cell data were stored into computer. Test results showed that buckling was occurred at the aluminum foam core and honeycomb core according to the increase of load. In the in-plane compression test, the maximum load of aluminum foam specimen was similar with that of honeycomb sandwich. The property of honeycomb was better than that of the foam in consideration of specific gravity. In the out-plane compression test, compression maximum load of aluminum honeycomb sandwich composite was higher than that of aluminum foam sandwich composite.

• Journal of KIISE:Computing Practices and Letters
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• v.15 no.9
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• pp.649-660
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• 2009

To deliver services suitable to user's situation in the ubiquitous environment, the researches on realizing new services by combining existing ones have been continuously increased. But, it is difficult to provide the personalized services to each user located in the ubiquitous service space where multiple users coexist. In this paper, we propose a service composition model based on user-centered service scenarios and a system for providing personalized services through finding services suitable to user's situation and combining them. The proposed system supports a simple service discovery protocol for finding services from heterogeneous smart objects with limited computing power in the ubiquitous environment. The system aggregates and stores various service scenarios and data derived from users and executes the appropriate services for users. We design and implement a prototype system for the mobile personal device.

• The KIPS Transactions:PartD
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• v.17D no.6
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• pp.395-404
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• 2010

Solid-State Disks (SSDs) have been currently considered as a promising candidate to replace hard disks, due to their significantly short access time, low power consumption, and shock resistance. SSDs, however, have drawbacks such that their write throughput and life span are decreased by random-writes, nearly regardless of SSDs controller designs. Previous studies have mostly focused on better designs of SSDs controller and reducing the number of write operations to SSDs. We suggest another method that reallocates data pages that tend to be simultaneously written to contiguous blocks. Our method gathers write operations during a period of time and generates write traces. After transforming each trace to a set of transactions, our method mines frequent itemsets from the transactions and reallocates the pages of the frequent itemsets. In addition, we introduce an algorithm that reallocates the pages of the frequent itemsets with moderate time complexity. Experiments using TPC-C workload demonstrated that our method successfully reduce 6% of total logical block access.

• Journal of the Korean Society of Food Science and Nutrition
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• v.22 no.2
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• pp.202-207
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• 1993

Ginseng-whey beverages were prepared with rennet whey, ginseng extract, sweetener, honey and Japanese apricot, inoculated with different strains of lactic acid bacteria and unfermented partly. The samples were stored at 4$^{\circ}C$ or 30$\pm$1$^{\circ}C$ and the sensory evaluations were carried out at 1st, 3rd and 5th week. As a result of sensory test, unfermented ginseng-whey beverage (A) with sweetener and honey (storage at cold temp.) in overall eating quality obtained the best score (8.64~8.86) due to stronger sweetness and weaker sourness, bitterness, astringent taste and aftertaste. The fermented ginseng-whey beverage (C) which was stored at 4$^{\circ}C$ with inoculation of Lac. acidophilus and Lac. delbrueckii sub-sp. bulgaricus and the unfermented samples stored at room temperature with sweetener, honey and Japanese apricot received a good evaluation. But, the fermented beverages (E, F) stored at room temperature obtained the lowest score (2.92~3.58).

• Journal of the Korean Institute of Intelligent Systems
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• v.17 no.5
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• pp.696-700
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• 2007

A new method that improves the performance of the phonetic transcription based speech recognition system is presented with the speaker-independent phonetic recognizer. Since SI phoneme HMM based speech recognition system uses only the phoneme transcription of the input sentence, the storage space could be reduced greatly. However, the performance of the system is worse than that of the speaker dependent system due to the phoneme recognition errors generated from using SI models. A new training method that iteratively estimates the phonetic transcription and transformation vectors is presented to reduce the mismatch between the training utterances and a set of SI models using speaker adaptation techniques. For speaker adaptation the stochastic matching methods are used to estimate the transformation vectors. The experiments performed over actual telephone line shows that a reduction of about 45% in the error rates could be achieved as compared to the conventional method.

• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.3
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• pp.337-342
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• 2010

The rise of music resources has led to a parallel rise in the need to manage thousands of songs on user devices. So users are tend to build play-list for manage songs. However the manual selection of songs for creating play-list is bothersome task. This paper proposes an auto play-list recommendation system considering user's context of use and preference. This system has two separate systems: mood and emotion classification system and music recommendation system. Users need to choose just one seed song for reflection their context of use and preference. The system recommends songs before the current song ends in order to fill up user play-list. User also can remove unsatisfied songs from recommended song list to adapt user preferences of the system for the next recommendation precess. The generated play-lists show well defined mood and emotion of music and provide songs that user preferences are reflected.

• Journal of the Korean Society of Food Science and Nutrition
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• v.30 no.5
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• pp.949-953
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• 2001

Persimmon has been considered to have a therapeutic value diseases in Korea, Dried, persimmon was applied to a wounded part for an anti-inflammatory and analgesic activities, Anti-coagulating activity has been detected in persimmon by a thrombin-induced clotting assay using human plasma. The anti-coagulating activity was detectible in stem, pulp, core, leaf, and seed of persimmon The stem part of persimmon contains maximal anti-coagulating activity after-size-fractionation. Both of an anticoagulant and its denaturating factor were present in persimmon pulp. The concentration of anti-coagulating activity was determined and compared in different harvesting time, species, and available foods. The level of anti-coagulating activity was highest in persimmon(Fuyu)harvested in November. The anti-coagulating activity was decreased significantly in its processed foods. Persimmon could be expected to be effective in prevention of diseases induced by excess coagulation.

• Journal of the Korean GEO-environmental Society
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• v.19 no.1
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• pp.25-30
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• 2018

Conventional monitoring method is used for evaluation of the reservoir and levee at the highest height sections. In recent years, automated measurement technology has been developed, and the measurement results are transmitted, collected and stored in real time into management office. Despite the development of real time monitoring technology, the measurement results are not used directly or indirectly with facility management at real time. Recently, as wireless sensor network measurement technology has been developed based on internet of things, this study proposed a real - time measurement and evaluation system based on wireless sensor network technology in the reservoir structure. As a result of the seepage analysis for the application, it was confirmed that the volumetric water content changes together with the change of the seepage line inside the embankment body according to the change of the water level of the embankment. In other words, the applicability of the measurement system with the volumetric water ratio set as the sensor node was verified.

• Journal of The Geomorphological Association of Korea
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• v.19 no.4
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• pp.139-155
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• 2012

Most of previous landform classification methods using DEM compares the values between the center of the cell and the surrounding cells, which in turn, greatly depends on analysis scale. To overcome the problem of scale-dependency, a new classification scheme is developed, which is called "Geomorphons". Unlike the traditional approaches using DEM, Geomorphons is the way which compares the level with other cells against the criteria cell. As a pilot study, we classify the landforms of Pyeongchang-Gun in Korea. Then, we compare the result with the other methods such as Topographic Position Index. Through the systematic analysis, we obtain the following findings. First, Geomorphons can reduce the time for the classification of landforms because of using unsupervised classification. Second, Geomorphons is little dependent on change in the scale, which can provide a pilot tool for reconnaissance study for covering large area.

• Proceedings of the Korea Water Resources Association Conference
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• 2015.05a
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• pp.381-381
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• 2015

표면영상유속계측법(Surface Image Velocimeter; SIV)은 영상분석기법의 일종으로 하천 표면의 유동을 영상저장장치로 기록하고 연속되는 이미지상의 입자이동을 계산하여 유속을 산정하는 방법이다. 그러나 표면영상유속계를 활용한 유속분석과정에서 현장 상황에 따라 많은 오차 요인들이 있을 수 있기 때문에 계산한 유속 산정 결과를 그대로 사용하면 정확도가 낮아질 수 있다. 특히 야간 영상과 같은 영상의 화질이 떨어지는 경우에는 유속 산정 결과를 필터링해서 사용해야 한다. 이는 순간 유속장을 분석하는 과정에서 획득된 이미지에 따라 분석된 유속벡터가 평균 유속보다 과다하게 크거나 상관계수 값이 너무 작은 경우가 포함되기 때문이다. 이 연구에서는 제주도 외도천 외도정수장에서 2013년 5월 27일 집중호우에 의한 유출 발생 주 야간 유출영상자료를 획득하여 표면영상유속계(SIV)와 ADCP를 활용하여 유량을 분석하고, 동시에 고정식 전자파 표면유속계인 Kalesto 관측 유량과 비교 분석하였다. 비교과정에서 제주도는 댐방류량과 같은 유량의 참값이 없으므로 각각 관측기기의 상대적인 비교를 하여 경향성을 분석하였다. 분석결과 주간유출영상은 상관계수가 0.6~0.7범위에 해당하는 유속이 전체 59개의 유속벡터 중 6.8%로 나타났으며, 0.7~0.8범위가 13.6%, 0.8~0.9범위가 18.6%, 0.9~1.0범위가 61.0%의 퍼센트를 나타났다. 야간유출영상을 주간유출영상과 비교해보면 0.6~0.7범위에 해당하는 상관계수가 6.8% 높게 분석되었으며, 반대로 0.9~1.0범위에 해당하는 상관계수는 17% 낮게 분석되었다. 이와 같은 결과는 야간유출영상이 주간유출영상에 비해 영상의 질이 떨어짐을 나타내며 표면영상유속계를 적용하여 유량을 산정하는 과정에서 획득되는 영상에 따라 상관계수에 대한 합리적인 필터링 과정이 필요하다.