• KDI Journal of Economic Policy
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• v.17 no.1
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• pp.107-126
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• 1995

본(本) 연구(硏究)는 자본거래자유화정도를 명목상의 규제완화여부에 의해 판별하는 종래의 접근방법(接近方法)에서 벗어나, 형식적(形式的) 규제여부(規制與否)에 관계없이 자본거래(資本去來)가 실질적으로 경제적(經濟的) 유인(誘引)에 따라 얼마나 활발하게 이루어지고 있는가를 측정함으로써 자본거래자유화정도(資本去來自由化程度)를 평가할 수 있는 방법을 모색하고 있다. 이와 관련해서 본 연구는 모두 5가지 접근방법을 시도하고 있다. 그 첫째는, 총대외무역량대비 자본거래량비중으로서 자본거래량이 상대적으로 증가하면 자본거래자유화정도가 높다고 본다. 둘째는, 환율절하기대를 감안한 국내외실질 금리차로서 대내외자본거래(對內外資本去來)가 자유로울수록 국내외금리차(國內外金利差)는 낮아질 것이기 때문에, 동 금리차가 낮을수록 자본자유화정도가 높다고 본다. 동 지수로서는 통화선물시장의 존재 여부에 따라 위험포함 및 불포함 대내외금리차를 사용할 수 있다. 셋째로는, 다소 복잡한 계량경제학적 방법을 통해 국내외실질금리간의 연계관계를 측정하는 방법으로서 두번째 방법의 개선에 해당된다. 그리고 넷째로는, 셋째번 방법에 의한 연계관계를 시간변동지수로 전환하여, 시간의 경과에 따른 자본자유화정도의 변화를 측정하고 있다. 마지막으로는, 자본거래를 위험자산의 국제교역관계(國際交易關係)로 파악하여, 무역에 있어서의 산업내교역지수측정방법을 자본거래에 적용하여 자본거래총유출입지수를 측정하였다. 동 지수는 저축투자갭의 보정적(補正的) 거래차원을 넘어 위험자산거래 자체를 위한 자본거래의 정도를 측정함으로써 순수하게 자본거래 자체의 메커니즘에 의해 자생적으로 일어나는 자본거래의 활성화정도에 대한 척도가 될 수 있을 것으로 판단된다. 이상의 방법들을 주로 한국(韓國), 일본(日本), 대만(臺灣) 등에 적용해서 평가한 결과 한국의 자본거래자유화정도(資本去來自由化程度)는 일본에 비해서는 낮지만 대만에 비해서는 높으며, 특히 90년대 들어 크게 향상된 것으로 평가되었다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.3 no.3
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• pp.485-499
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• 1999

Auctions are appealing market-type mechanisms because they can be deployed to solve the twin problems of resources pricing and allocation. Nonetheless the effectiveness of an auction mechanism in radio spectrum property rights should not be taken for granted. Policymakers need to be aware of the complexity of introducing market discipline in an area where none existed before. Auction design is critical to the success of the allocation process. However, a poorly designed auction mechanism can have detrimental effects on the spectrum rights allocation process. This study discusses some of the key elements and issues of auction design of radio spectrum rights for its efficient allocation. Particularly this study discusses, based on the existing auction theory and other countries' experiences, such issues as bidding rule, value interdependency and sequence of auction, information structure and asymmetric bidder, and wealth constraints and imperfect capital market.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2004.04a
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• pp.487-490
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• 2004

상황 인식(context-awrare)은 인간-컴퓨터 상호작용의 단점을 극복하기 위한 방법으로써 많은 주목을 받고 있다. 이 논문에서는 SoC(System-on-a-Chip)로 구현될 수 있는 상황 인식 시스템 구조를 제안한다. 제안한 구조는 센서 추상화, 컨텍스트 변경에 대한 통지 메커니즘, 모듈식 개발, if-then규칙을 이용한 쉬운 서비스 구성과 유연한 상황 인식 서비스 구현을 지원한다. 이 구조는 통신 모듈, 처리 모듈, 블랙보드를 포함하는 SoC 마이크로프로세서 부분과 규칙 기반 시스템 모듈을 구현한 하드웨어로 구성된다. 규칙 기반 시스템 하드웨어는 모든 규칙의 조건부에 대해 매칭 연산을 병렬로 수행하고, 규칙의 결론부는 마이크로프로세서에 내장된 행위 모듈을 호출함으로써 작업을 수행한다. 제안한 구조의 SoC 시스템은 SystemC SoC 개발 환경에서 설계되고, 성공적으로 테스트되었다. 제안한 SoC 기반의 상황 인식 시스템 구조는 주거 환경에서 컨텍스트를 인식하여 노인을 보조하는 지능형 이동 로봇 등에 적용될 수 있을 것으로 기대된다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.1
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• pp.73-79
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• 2016

Higher circuit breaker safety standards can be obtained by increasing the sustaining time of the latching section. This time increase is achieved through velocity reduction after contacting when the closing mechanism operates. The potential for the re-closing phenomenon to occur is also reduced by obtaining time to return open latch. In this study, the sustaining time for the latching section was increased through cam profile optimization based on the displacement response of the moving parts. In addition, the existing performance velocity was also satisfied. A multibody dynamics model of the circuit breaker was developed using ADAMS. To validate the model, simulation results were compared to experiment results. Then, cam profile optimization was carried out using an optimal design program PIAnO. Design variables selected included the radial direction of the cam. Design sensitivity analysis was carried out by design section as well. As a result of optimization, the sustaining time for the latching section was increased.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.41 no.4
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• pp.9-21
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• 2004

The current paper proposes a genetic algorithm (GA)-based segmentation method that can automatically extract and track moving objects. The proposed method mainly consists of spatial and temporal segmentation; the spatial segmentation divides each frame into regions with accurate boundaries, and the temporal segmentation divides each frame into background and foreground areas. The spatial segmentation is performed using chromosomes that evolve distributed genetic algorithms (DGAs). However, unlike standard DGAs, the chromosomes are initiated from the segmentation result of the previous frame, then only unstable chromosomes corresponding to actual moving object parts are evolved by mating operators. For the temporal segmentation, adaptive thresholding is performed based on the intensity difference between two consecutive frames. The spatial and temporal segmentation results are then combined for object extraction, and tracking is performed using the natural correspondence established by the proposed spatial segmentation method. The main advantages of the proposed method are twofold: First, proposed video segmentation method does not require any a priori information second, the proposed GA-based segmentation method enhances the search efficiency and incorporates a tracking algorithm within its own architecture. These advantages were confirmed by experiments where the proposed method was success fully applied to well-known and natural video sequences.

• Journal of Aerospace System Engineering
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• v.16 no.1
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• pp.49-55
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• 2022

The role of drones has been expanded to various fields such as agriculture, construction, and logistics. In particular, agriculture drones are emerging as an effective alternative to solve the problem of labor shortage and reduce the input cost. In this study therefore, we proposed the fruit recognition algorithm and harvesting mechanism for fruit harvesting drone system that can safely harvest fruits at high positions. In the fruit recognition algorithm, we employ "You-Only-Look-Once" which is a deep learning-based object detection algorithm and verify its feasibility by establishing a virtual simulation environment. In addition, we propose the fruit harvesting mechanism which can be operated by a single driving motor. The rotational motion of the motor is converted into a linear motion by the scotch yoke, and the opened gripper moves forward, grips a fruit and rotates it for harvesting. The feasibility of the proposed mechanism is verified by performing Multi-body dynamics analysis.

• Review of KIISC
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• v.12 no.4
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• pp.1-10
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• 2002

SC27의 WG2는 정보기술보안을 위한 관련 메커니즘들에 대한 표준을 만드는 Working Group이다. 본 고에서 소개하는 24차 베를린회의(2002. 4) 이전에 개최된 21차 동경회의(2000. 10)와 22차 오슬로회의(2001. 4)는 동 학회지 제11권 1호(2001년 2월)와 제11권 3호(2001년 6월)클 참고하면 본 고를 이해함에 있어 많은 도움이 될 것으로 사료된다. 한편 23차 서울회의에 대하여는 WG2 중 블록암호 표준화 동향에 대하여 기고한 제11권 6호(2001년 12월)를 참고로 하기 바란다. 본 고에서는 지난 2002. 4. 22(월)∼26(금)에 걸쳐 독일 베를린의 DIN(Deutsches Institut fur Normung)에서 개최된 24차 회의에 다녀와서 보안기술 표준화에 관한 최신 정보를 이 분야에 관심이 있는 전문가들에게 전파하고자 각 과제별로 진행사항과 회의결과 및 회의 중 특기 할만한 사항들을 정리하였다.

• Journal of Intelligence and Information Systems
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• v.28 no.4
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• pp.329-346
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• 2022

Recently, as the market for short form videos (Instagram, TikTok, YouTube) on social media has gradually increased, research using them is actively being conducted in the artificial intelligence field. A representative research field is Video to Shop, which detects fashion products in videos and searches for product images. In such a video-based artificial intelligence model, product features are extracted using convolution operations. However, due to the limitation of computational resources, extracting features using all the frames in the video is practically impossible. For this reason, existing studies have improved the model's performance by sampling only a part of the entire frame or developing a sampling method using the subject's characteristics. In the existing Video to Shop study, when sampling frames, some frames are randomly sampled or sampled at even intervals. However, this sampling method degrades the performance of the fashion product search model while sampling noise frames where the product does not exist. Therefore, this paper proposes a sampling method MF (Missing Fashion items on frame) sampler that removes noise frames and improves the performance of the search model. MF sampler has improved the problem of resource limitations by developing a keyframe mechanism. In addition, the performance of the search model is improved through noise frame removal using the noise detection model. As a result of the experiment, it was confirmed that the proposed method improves the model's performance and helps the model training to be effective.

• Journal of the Korean Society of Food Science and Nutrition
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• v.41 no.7
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• pp.895-900
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• 2012

The effects of three fractions, hexane (BHHH), chloroform (BHHC), and ethyl acetate (BHHE), from water extract of Benincasa hispida on the underlying mechanisms of adipogenesis were investigated in 3T3-L1 cells. Intracellular lipid droplets were stained with Oil Red O dye and quantified. Compared to control, lipid accumulation significantly decreased by 11% and 13% upon treatment with BHHC and BHHE, respectively at a concentration of 50 ${\mu}g/mL$. Intracellular triglyceride (TG) levels were also reduced by 21% and 16%, respectively, at the same concentration. To determine the mechanism behind the reductions in TG content and lipid accumulation, glycerol release and expression levels of adipogenic marker genes were measured. The levels of free glycerol released into culture medium increased by 13% and 17% upon treatment with BHHC and BHHE, respectively. In subsequent measurements using real-time polymerization chain reaction, the mRNA levels of $PPAR{\gamma}$, C/$EBP{\alpha}$, and leptin significantly decreased upon treatment with BHHE (45%, 67%, and 35%) in comparison with non-treated control. These results suggest that BHHE inhibits adipocyte differentiation by blocking $PPAR{\gamma}$, C/$EBP{\alpha}$, and leptin gene expression in 3T3-L1 cells, resulting in reduced lipid accumulation, increased glycerol release, and intracellular triglycerides.

• Korean Journal of Heritage: History & Science
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• v.44 no.3
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• pp.92-111
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• 2011

This study focus on the restoration stone selection of break-out part based on material characteristics analysis and the conservational safety diagnosis using various nondestructive techniques for Jungdong and Banjukdong Stone Auariums. As a result, the original rocks of the stone aquariums body are porphyritic granodiorite with magnetite-series having igneous lineation, microcline phenocryst, veinlet and basic xenolith. As a result of the provenance presumption of the host rock, a rock around Gamgokri area in Nonsan City was identified the genetically same rock. Therefore, the rock is appropriate for restoration materials of the break-out part. The deterioration assessment showed that the stone aquariums were highly serious scaling, scale off and blackening. Particularly, the front face of Banjukdong stone aquarium needs reinforcement of structural crack (760mm) caused from igneous lineation of biotite. Blackening contaminants on the stone aquariums surface occurred by combining iron oxide, manganese oxide and clay mineral. Also, major factors of efflorescence contaminants were identified as calcite (Jungdong stone aquariums) and gypsum (Banjukdong stone aquariums). The physical characteristics of stone aquariums appeared that the original and new stone is third (moderately weathered) and second grade (slightly weathered), respectively. This study sets up an integrated conservation system from material analysis to restoration stone selection and conservational safety diagnosis of Jungdong and Banjukdong stone aquariums.