• Journal of the Korean Society for information Management
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• v.32 no.3
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• pp.413-432
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• 2015

This study analyzes the copyright problems of document delivery services based on interlibrary loan which are operated by KERIS and KISTI according to the agreements with KORRA. As a result of the study, we found that there are limitations of the libraries and copyright works to implement the document delivery services. Also, the electronic document delivery is the only between librarians and there is no provisions in the agreements for individual users who are not affiliated to libraries. This study suggests introduction of the ground provision for the interlibrary loan in the Copyright Act of Korea and development of authoritative guideline for details of document delivery services. Also, the study suggests that end users to request documents could be print out it but the library have to install systems to avoid copyright infringement. Finally, the study proposes the copyright fee based model for the document delivery services for individual users.

• Korean Journal of Culture and Social Issue
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• v.17 no.3
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• pp.287-304
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• 2011

The Purpose of this study is to understand phases and paradigms related to voluntary services offered by undergraduates and the processes in which voluntary services are implemented. For this, interviews for 23(men: 10, women: 13) undergraduates were conducted from Aug., 2008 to Apr., 2009 were conducted and the data collected from those interviews were analyzed on the basis of the Grounded Theory. Main analysis procedure is known as codings(open coding, axial coding, selective coding). This analyses produced 119 concepts, 41 subcategories, and 16 categories in open coding. Then, axial coding was conducted to organize the basic framework of generic relationships among psychological motivation, social context, personal perception, practical action, psychological response, and psychological consequence. Core essence is "Volunteer types are categorized simple practice type, self-serving type, and community type." Finally, undergraduate volunteers were explained in 3 types(simple practice, self-serving, and community) on the basis of paradigms. These results were discussed in terms of further research and limitation.

• Proceedings of the Korea Water Resources Association Conference
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• 2016.05a
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• pp.328-328
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• 2016

우리나라는 생활용수의 대부분을 지표수에 의존하고 있는 실정이다. 그러나 지표수는 가뭄과 같은 기상변화, 수질사고 등으로 물 공급의 안정성에 문제가 되기도 한다. 향후 기후변화는 가뭄의 빈도와 강도를 증대시킬 것으로 파악되므로 수질 및 수량의 문제를 더욱 악화시킬 것으로 예상된다. 이러한 문제점을 해결하기 위해 지표수를 대수층 내에 인공적으로 함양한 뒤 대수층의 자연정화 기능에 의해 여과된 양질의 청정원수를 생산하는 기술을 본 연구에서 현장에 실증 적용하는 시설을 구축하였다. 이러한 기술은 기존의 지하 대수층을 이용하는 강변여과 등이 갖는 장점을 취하고 단점을 보완하였으며 친환경적이며 지속가능한 용수공급뿐만 아니라 청정 원수 확보를 통해 정수처리비용을 절감, 장기간의 가뭄이나 지표수 수질사고 시에 비상용수 공급 등 기존 취수원들과 달리 많은 장점을 갖고 있는 대규모 청정지하저수지 시험시설이다. 청정 지하저수지 기술이 주로 적용되는 지역은 해안지역 또는 하구 델타지역을 대상으로 한다. 해안 또는 델타지역은 해수침투로 인하여 염지하수가 부존되어 있기 때문에 지하수자원 활용에 매우 제한적이다. 따라서 지표수(담수)를 전처리하여 대수층에 인공적으로 함양을 하여 염지하수 대수층 안에 담지하수(담수체)를 형성할 수 있다. 이는 염수와 담수의 밀도차에 의해 희석되지 않는 특성을 이용한 기술이다. 청정 지하저수지 시험시설은 크게 지표수 취수시설, 전처리시설, 주입정, 양수정, 운영시스템으로 나눌 수 있다. 주입정 및 양수정은 원형의 형태로 지하저수지 조성범위 중심부에 9개의 주입정과 외각에 8개의 양수정을 설치하였다. 시험시설의 운영 과정은 하천수를 취수하여 전처리시설에서 탁도를 제거한 후, 피압대수층 염지하수에 동력으로 주입을 한다. 이때 기존에 부존되어 있던 염지하수를 밀어내고 담수체 지하수 형성을 유도한다. 일정기간 주입을 통해 목표 담수체를 만들어 내면 양수정에서 담수를 취수하되, 대수층의 모래자갈층을 일정거리 이동하여 취수하는 방식이다. 즉, 하천수를 대수층에 함양하고, 일정거리를 이동하여 취수하는 ASTR 방식의 대체수자원 확보 기술이다. 시험시설은 통합운영센터를 통해 원격감시 및 각종 제어/계측을 실시하며, 모니터링된 자료는 운영시스템에서 관리한다. 본 연구시설에서는 대수층 주입, 관정폐색, 미생물/지화학 수질반응, 지하수모니터링, 지반변형 등이 주요 핵심 연구를 진행하고 있도록 시설을 구성하였다. 본 시험시설은 2015년 8월 착공하여 2016년 4월에 완공 예정이며, 2016년 3월부터 주입을 시작하여 6개월간 피압대수층에 주입을 실시하고 이후부터 주입과 양수를 병행할 계획이다.

• Journal of Satellite, Information and Communications
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• v.11 no.3
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• pp.51-57
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• 2016

Many kinds of telemetry should be monitored to check the state of spacecraft and it leads the time consumption. However, it is very important to define the status of satellite in short time because the contact number and time of low earth orbit satellite is limited. Also, on-board fault management should be prepared for non-contact operation because of the sever space environment. In this paper, on-board and ground autonomous operation method for the safety enhancement is described. Immediate fault detection and response is possible in ground by explicit anomaly detection through satellite event and error information. Also, satellite operation assistant system is proposed for ground autonomy that collect event sequence in accordance with related telemetry and recommend or execute an appropriate action for abnormal state. Critical parameter monitoring method with checking rate, mode and threshold is developed for on-board autonomous fault management. If the value exceeds the limit, pre-defined command sequence is executed.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.32 no.1A
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• pp.19-30
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• 2012

Recently, vision-based dynamic deflection measurement techniques have significant interests and are getting more popular owing to development of the high-quality and low-price camcorder and also image processing algorithm. However, there are still several research issues to be improved including the self-vibration of vision device, i.e. camcorder, and the image processing algorithm in device aspect, and also the application area should be extended to measure three dimensional movement of floating structures in application aspect. In this study, vision-based dynamic motion measurement technique using multiple targets is proposed to measure three dimensional dynamic motion of floating structures. And also a new scheme to select threshold value to discriminate the background from the raw image containing targets. The proposed method is applied to measure the dynamic motion of large concrete floating quay in open sea area under several wave conditions, and the results are compared with the measurement results from conventional RTK-GPS(Real Time Kinematics-Global Positioning System) and MRU(Motion Reference Unit).

• Proceedings of the Korea Society for Industrial Systems Conference
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• 2002.06a
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• pp.148-155
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• 2002

Multithreaded models improve the efficiency of parallel systems by combining inner parallelism, asynchronous data availability and the locality of von Neumann model. This model executes thread code which is generated by compiler and of which quality is given by the method of generation. But multithreaded models have the demerit that execution model is restricted to a specific platform. On the contrary, Java has the platform independency, so if we can translate from threads code to Java bytecode, we can use the advantages of multithreaded models in many platforms. Java executes Java bytecode which is intermediate language format for Java virtual machine. Java bytecode plays a role of an intermediate language in translator and Java virtual machine work as back-end in translator. But, Java bytecode which is translated from multithreaded models have the demerit that it is not secure. This paper, multhithread code whose feature of platform independent can execute in java virtual machine. We design and implement translator which translate from thread code of multithreaded code to Java bytecode and which check secure problems from Java bytecode.

• International Journal of Highway Engineering
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• v.8 no.3 s.29
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• pp.129-141
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• 2006

The vertical soil pressure developed in the granular layer of asphalt pavement system is influenced by various factors, including the wheel load magnitude, the loading speed, and asphalt pavement temperature. This research observed the distribution of vertical soil pressure in pavement supporting layer by investigating measured data from soil pressure gage in the KHC Test Road. The existing specification of subbase and subgrade compaction was also evaluated with measured vertical pressure. The finite element analysis was conducted to verify the accuracy of results with measured data because it can maximize research capacity without significant field test. The test data was collected from A5, A7, A14, and A15 test sections at August, September, and November 2004 and August 2005. Those test sections and test data were selected because they had best quality. The size of influence area was evaluated and the vertical pressure variation was investigated with respect to load level, load speed, and pavement temperature. The lower speed, higher load level, and higher pavement temperature increased the vertical pressure and reduced the area of influence. The finite element result showed the similar trend of vertical pressure variation in comparison with measured data. The specification of compaction quality for subbase and subgrade is higher than the level of vertical pressure measured with truck load so that it should be lurker investigated.

• Spatial Information Research
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• v.15 no.2
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• pp.111-121
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• 2007

The GPS positioning offer 3D position using code and carrier phase measurements, but the user can obtain the precise accuracy positioning using carrier phase in Real Time Kinematic(RTK). The main problem, which RTK have to overcome, is the necessary to have a reference station(RS) when using RTK should be generally no more than 10km on average, which is significantly different from DGPS, where distances to RS can exceed several hundred kilometers. The accuracy of today's RTK is limited by the distance dependent errors from orbit, ionosphere and troposphere as well as station dependent influences like multipath and antenna phase center variations. For these reasons, the author proposes Network based GPS Carrier Phase Differential Positioning using Multiple RS which is detached from user receiver about 30km. An important part of the proposed system is algorithm and software development, named DAUNet. The main process is corrections computation, corrections interpolation and searching for the integer ambiguity. Corrections computation of satellite by satellite and epoch by epoch at each reference station are calculated by a Functional model and Stochastic model based on a linear combination algorithm and corrections interpolation at user receiver are used by area correction parameters. As results, the users can obtain the cm-level positioning.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.11a
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• pp.174-174
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• 2009

현재 전자부품용으로 사용되는 유리프리트의 경우 PbO계를 주로 사용하고 있다. 최근 환경규제에 따른 PbO 사용이 제한됨에 따라 이를 대체할 Pb-free 유리 조성에 대한 연구가 활발히 진행 중이다. Pb-free계로서는 $Bi_2O_3$계, $B_2O_3$계가 주로 연구되고 있으나 소성 온도가 $500^{\circ}C$이상으로 높고 또한 $Bi_2O_3$ 계는 중금속이기 때문에 문제가 있다. 본 연구에서는 $400^{\circ}C$ 미만 소성이 가능한 SnO-$P_2O_5$계를 기본 조성계로 선택하고 열적, 전기적, 화학적 특성을 개선하기 위해 $R_2O_3$(R=Al, B), RO(R=Mg, Zn, Ca, Ba) 를 첨가하였다. 개선된 조성으로 샘플을 만들고 이를 대상으로 실제 전자부품 생산 공정에 적용 실험을 진행 하였다. 실험에 사용된 전자 부품은 소형 칩 베리스터로 생산 공정에서 코팅용 유리프리트와 파우더를 절연체로서 전면에 코팅하게 된다. 유리프리트를 코팅함으로서 누설 전류를 차단하고 생산 공정시 베리스터 내부를 보호하게 된다. 실험에 사용된 샘플의 열적 특성은 TMA로, 전기적 절연 특성은 고 절연저항 측정기로 측정하였고 내 산성과 내 알칼리성도 측정하였다. 샘플을 이용하여 완성된 칩 베리스터의 성능은 고온, 내습 신뢰성 TEST(고온:$150^{\circ}C$ 12HR, 내습:$85^{\circ}C$-85%12HR)로 실험하여 합부판정 (Leakage current <10uA)을 내려 완성품과 불량품을 가려내었다.

• Research in Plant Disease
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• v.7 no.2
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• pp.107-111
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• 2001

Deterioration of pod and seed quality by pod and stem blight and purple blotch is a serious problem in the production of vegetable soybean. Major inoculum sources for the causal pathogens, Phomopsis spp. and Cercospora kikuchii, are soybean straw and debris. Phomopsis spp. have been known to be either limited for hyphal growth or latent in immature soybean tissues. In this experiment, cultural practices using these ecological traits of the pathogens were applied as a control measure. In plastic mulching, seed infection was remark ably reduced by drip irrigation as compared to overhead sprinkling, but not reduced in no mulching cultivation. Control value of plastic mulching was 28.0% for pod and stem blight and 29.3% for purple blotch, which was lower than that of benomyl application. By the first week in June, 78% of overwintered soybean straw examined contained matured alpha spores in pycnidia, acting as primary inoculum. Secondary inoculum of phomopsix spp. was observed abundantly throughout from mid June to September on fallen cotyledons from current crops and subsequently was found on petiole debris. Consequently, both plastic mulching and drip irrigation were effective to some extent for controlling pod and stem blight and purple blotch without significant reduction in soybean yield, and the cultural practices in combination with field sanitation resulted in removing more the secondary inoculum.