• Journal of Digital Convergence
• /
• v.15 no.11
• /
• pp.121-131
• /
• 2017

The Fuzzy-analytic hierarchy process (AHP) was adopted as the methodology for this study because it allows for the use qualitative judgments by experts. Based on results of the analysis of the success factors for frozen storage/cold storage warehouses, the facility factor was identified as the most important to consider. This factor had a weight of 0.307, followed by systems and operations, accessibility, and standardization/automation with weights of 0.263, 0.255, and 0.175, respectively. The conclusions and implications of the study are as follows. First, the efficiency of constant temperature and humidity systems and the heat insulation property of buildings need to be enhanced. Second, the efficiency of the operations should be enhanced through the standardization of equipment rather than by standardizing product loading. Finally, since logistics and transportation costs are higher for frozen storage/cold storage warehouses than for general distribution, accessibility needs to be considered as the first priority.

• Science of Emotion and Sensibility
• /
• v.23 no.1
• /
• pp.41-56
• /
• 2020

This study suggests multisensory interaction techniques to help visually impaired people appreciate and understand artworks through non-visual senses such as tactile, auditory, and olfactory senses. A user study was conducted on the basis of a qualitative interview about the experience of appreciating artwork through the multisensory interaction system to visually impaired people so as to verify the development of the interaction techniques. The user test shows that the multisensory interactions in artwork generally not only help them appreciate and understand it but also give them satisfaction through artwork appreciation. However, it also indicates that some multisensory interactions caused the visually impaired people confusion and could not be perceived during the appreciation. On the basis of these outcomes, implications in this study are as follows. This study has contributed to providing specific development guidelines and indicators of non-visual multisensory interactions as a technical alternative to improve accessibility to cultural and artistic activities for the visually impaired. Furthermore, this study is expected to contribute to building a technical background, which can provide comprehensive sensory experiences with not only blind people but also non-blind people such as children and the elderly through universal interaction techniques beyond existing visual-oriented fragmentary experience.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2004.05b
• /
• pp.753-758
• /
• 2004

건천화란 하천이 건천이 되어가는 과정이라고 할 수 있다. 그러나 이의 정량적 접근이 어려운 이유는 건천이 되어가는 과정에 대한 현상을 지속적으로 관찰하기 어렵고, 순수한 자연현상이라기보다 인위적 요소가 간섭한 결과이기 때문이다. 본 연구는 건천이 되어가는 하천 중에서도 도시화에 의한 건천화의 영향이 큰 것으로 보이는 우이천 유역에 대해 건천화의 원인을 분석하여 몇 가지 결론과 대책을 제시하였다. 우이천은 유역면적 $27.67km^2$, 유로연장 11.75km의 비교적 좁은 면적 내에 인구 461,351명이 거주하고 주변 행정구역 총 인구가 604,282명인 지방2급하천이다. 유역 내 북부와 북서부의 산악지역을 통과하는 상류는 대부분 계류(溪流)로서 자연상태를 유지하고 있으나, 중${\cdot}$하류는 양안의 셋방, 복개, 직강화, 보 및 낙차공 등 인공구조물로 인해 하천형상이 크게 왜곡되어 있는 전형적인 도시하천유역이다. 본 연구는 우이천에 대한 건천화 원인분석을 위해 크게 4가지 방봅으로 접근하였는데 반분포형 유출모형인 TOPMODEL에 의한 장기유출분석, 수문${\cdot}$기상자료에 의한 분석, 인문${\cdot}$사회자료의 분석, 지하수위 분석 등이었다. 분석결과 우이천 유역과 같이 장기간에 걸쳐 도시화가 진행된 유역은 수문순환계의 왜곡이 돌이킬 수 없는 수준이므로, 적절한 건천화 방지대책의 방향은 건천화의 원인이 되는 인자를 제거함으로써 줄어든 유량을 회복하는 방안보다는 인위적이고 강제적인 방식으로 추가적인 하천수량을 확보하는 것이 타당하다 사료된다. 하천의 건천화는 하나의 주된 원인이 지배적일 수도 있지만 간접적인 영향이 많고, 하나의 원인이 다른 인자에 영향을 주어 연쇄적인 영향을 미칠 수도 있는 복잡한 현상이다. 따라서 다양한 각도에서 다양할 접근방식으로 방지대책을 수립하여야 할 것이다.적에 따른 임계지속기간과 유출량의 변화를 검토해 보았다.이를 각각의 경우의 해석해 결과와 비교${\cdot}$분석하였다. 후방추적 퍼프모형은 전방추적 퍼프모형에 비하여 사용된 퍼프수와 관계없이 작은 오차를 발생하였으며, 전체적으로 퍼프 모형이 입자모형보다는 훨씬 적은 수의 계산을 통해서도 작은 오차를 나타낼 수 있다는 것을 알 수 있었다. 그러나 Gaussian 분포를 갖는 퍼프모형은 전단흐름에서의 긴 유선형 농도분포를 모의할 수 없었고, 이에 관한 오차는 전단계수가 증가함에 따라 비선형적으로 증가하였다. 향후, 보다 다양한 흐름영역에서 장${\cdot}$단점 분석 및 오차해석을 수행한 후에 각각의 Lagrangian 모형의 장점만을 갖는 모형결합 방법을 제시할 수 있을 것으로 판단된다.mm/$m^{2}$로 감소한 소견을 보였다. 승모판 성형술은 전 승모판엽 탈출증이 있는 두 환아에서 동시에 시행하였다. 수술 후 1년 내 시행한 심초음파에서 모든 환아에서 단지 경등도 이하의 승모판 폐쇄 부전 소견을 보였다. 수술 후 조기 사망은 없었으며, 합병증으로는 유미흉이 한 명에서 있었다. 술 후 10개월째 허혈성 확장성 심근증이 호전되지 않아 Dor 술식을 시행한 후 사망한 예를 제외한 나머지 6명은 특이 증상 없이 정상 생활 중이다 결론: 좌관상동맥 페동맥이상 기시증은 드물기는 하나, 영유아기에 심근경색 및 허혈성 심근증 또는 선천성 승모판 폐쇄 부전등을 초래하는 심각한 선천성 심질환이다. 그러나 진단 즉시 직접 좌관상동맥-대동맥 이식술로 수술적 교정을 해줌으로써 좋은 성적을 기대할 수 있음을 보여주었다.특히 교사들이 중요하게 인식하는 해방적 행동에 대한 목표를 강조하여 적용할 필요가 있음을 시사하고 있다.교하여 유의한 차이가 관찰되지 않았다. 또한 HSP 환자군에서도 $IL1RN^{*}2$ allele 빈도와 carria

• The Journal of the Acoustical Society of Korea
• /
• v.42 no.5
• /
• pp.403-411
• /
• 2023

Functional ultrasound imaging, such as elasticity imaging and micro-blood flow Doppler imaging, enhances diagnostic capability by providing useful mechanical and functional information about tissues. However, the implementation of functional ultrasound imaging poses limitations such as the storage of vast amounts of data in Radio Frequency (RF) data acquisition and processing. In this paper, we propose a sub-Nyquist approach that reduces the amount of acquired axial samples for efficient shear-wave elasticity imaging. The proposed method acquires data at a sampling rate one-third lower than the conventional Nyquist sampling rate and tracks shear-wave signals through RF signals reconstructed using band-pass filtering-based interpolation. In this approach, the RF signal is assumed to have a fractional bandwidth of 67 %. To validate the approach, we reconstruct the shear-wave velocity images using shear-wave tracking data obtained by conventional and proposed approaches, and compare the group velocity, contrast-to-noise ratio, and structural similarity index measurement. We qualitatively and quantitatively demonstrate the potential of sub-Nyquist sampling-based shear-wave elasticity imaging, indicating that our approach could be practically useful in three-dimensional shear-wave elasticity imaging, where a massive amount of ultrasound data is required.

• Journal of the Korea Society of Computer and Information
• /
• v.14 no.3
• /
• pp.41-49
• /
• 2009

Flash memory has become increasingly requestion for the importance and the demand as a storage due to its low power consumption, cheap prices and large capacity medium. This research is to design a high performance flash memory structure for the substitution of a hard-disk by dynamic prefetching of aggressive spatial locality from the spatial smart buffer system. The proposed buffer system in a NAND flash memory consists of three parts, i.e., a fully associative victim buffer for temporal locality, a fully associative spatial buffer for spatial locality, and a dynamic fetching unit. We proposed new dynamic prefetching algorithm for aggressive spatial locality. That is to use the flash memory instead of the hard disk, the proposed flash system can achieve better performance gain by overcoming many drawbacks of the flash memory by the new structure and the new algorithm. According to the simulation results, compared with the smart buffer system, the average miss ratio is reduced about 26% for Mediabench applications. The average memory access times are improved about 35% for Mediabench applications, over 30% for Spec2000 applications.

• Science of Emotion and Sensibility
• /
• v.12 no.1
• /
• pp.19-32
• /
• 2009

Recently emotional relationships between industrial products and user experience are getting more attention than ever. However, current user interface design has focused just on the mechanical and logical aspects. This research proposed a new approach to improve user's emotional experience to interface design and introduced storytelling as a new possibility. Four types of user interface - logical interface, picture added interface, storytelling-applied interface, and storytelling-applied interface with a story script - were used for this research. Eighty college students participated in this research. Each participant was randomly assigned to one of four types of user interfaces. Additionally, their individual differences in affect intensity were measured. he results show that users reported more emotional experience in the storytelling-applied interface and storytelling-applied interface with a story script than the logical interface and just picture added interface. The results also suggest that the higher satisfaction was experienced for the storytelling-applied interface. And all those results are differentiated by the users' affect intensity. The users who have higher affect intensity expressed heavier emotional experience and deeper satisfaction for the storytelling-applied interface.

• Journal of the korean academy of Pediatric Dentistry
• /
• v.49 no.4
• /
• pp.453-467
• /
• 2022

The purpose of this study was to evaluate the accessibility of pediatric dental clinics and quantitatively compare the regions with the best and worst accessibility to pediatric dental clinics in South Korea using the geographic information system. Seoul city showed the highest density of pediatric dental clinics, while Gyeongbuk and Jeonbuk provinces showed the lowest density. Seoul city had a service area ratio of 100% in all districts on a 10 km basis. In Gyeongbuk and Jeonbuk provinces, more than half of the districts had a service area ratio of 0%. In Seoul, the average distance from elementary school to the nearest pediatric dental clinic was 3.45 km. The average distance values were 43.66 km and 40.57 km in Gyeongbuk and Jeonbuk provinces, respectively, which were 12.66 times and 11.76 times longer than the average distance in Seoul city.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
• /
• v.18 no.2
• /
• pp.95-111
• /
• 2023

Korea has achieved a high startup rate by promoting government-led startup policies for national economic and industrial development. However, as high as the startup rate is, the closure rate of startup companies can be judged to be insufficient for the qualitative growth of the domestic startup ecosystem. This study aims to investigate how to improve the survival rate of startups by overcoming the valley of death from a location environment perspective. It analyzes the effects of technology orientation and market orientation of start-ups on management performance and the moderating effects of economic, accessibility, and network factors that constitute the location environment. To achieve the research objectives, the empirical analysis was conducted on start-up companies that received corporate support projects from innovation intermediary organizations. The results show that R&D capability of technology orientation has a significant effect on management performance, and market information generation and market information response of market orientation have a significant effect on management performance. As for the moderating effect, accessibility, a sub-factor of the location environment, has a positive moderating effect on the relationship between technological innovation and managerial performance, and the location environment (economy, accessibility, and network) has a positive moderating effect on the relationship between market information generation and managerial performance. This study compared and analyzed previous studies on the success and failure of start-ups and identified common factors. In addition, this study provides policy implications for the sustainable growth of startups through empirical analysis and interview with stakeholders. For future research, it is necessary to compare and analyze start-ups in metropolitan areas and non-metropolitan areas. In addition, it is necessary to study startups that have moved out of the region and into the metropolitan area to find ways to develop the regional startup ecosystem.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.778-780
• /
• 2005

최근 디지털 융합(Digital Convergence)이 활발히 진행되면서 이동형 장치(Mobile Device)는 더욱 대용량, 고성능화 되고 비휘발성 메모리 요구가 커지고 있다. 이에 휴대가 용이하여, 접근시간이 빠르고, 전력소비가 적은 플래시 메모리가 많이 사용되고 있으나 상대적으로 느린 지움 시간과 지움 횟수의 한계 등 극복해야할 문제점이 있다. 본 논문에서는 이러한 문제점을 해결하기 위한 플레인 지움 정책을 제안하고 성능평가를 실시한다. 제안하는 플레인 지움 정책은 기존의 지움 정책과 같이 플래시의 블록단위의 균등한 사용을 고려할 뿐만 아니라 임베디드 시스템의 제한된 성능을 고려하여 연산을 최소화한다. 제안된 방법은 Greedy, Cost-benefit 방법에 비해 Wear-leveling에서 성능을 향상시켰고, RCP(Ranked Cleaning Policy)에 비해 연산횟수를 감소시켰다.

• The Korean Journal of Financial Management
• /
• v.14 no.1
• /
• pp.171-205
• /
• 1997

'80년대 중반 들어 주가지수 예측모형으로 애용되던 시계열 예측모형에 대한 근본적인 의문이 제기되었다. 이것은 기존 예측모형이 선형 데이터 생성과정을 기본가정으로 채택하고 있지만 진정한 데이터 생성과정은 비선형일 수도 있다는 점에서 출발한다. 주가지수의 변동을 유발하는 경제의 기본구조가 비선형임에도 불구하고 이를 선형모형으로 접근한다면 주가의 움직임을 제대로 설명할 수 없을 뿐만 아니라 이러한 설정오류는 모형의 신뢰성을 크게 손상시킨다. 이와 같은 점에 착안하여 본 연구는 업종별 주가지수의 비선형 검정을 통해 주가가 어떠한 형태의 경제구조에서 생성되었는지 여러 가지 방법으로 정정한다. 10개 업종지수의 검정결과 보험업을 제외한 대부분의 업종지수가 카오스 끌개를 보유하고 있다는 증거가 포착되었다. 표본외 예측을 위해서 국지적 가중회귀법을 채택하였는데 예측결과 모형에 따라 $6{\sim}7$개 업종에서 통상최소자승법보다 예측력 우위를 보였다.