이상구 교수

For years, recursive neural networks (RvNNs) have been shown to be suitable for representing text into fixed-length vectors and achieved good performance on several natural language processing tasks. However, the main drawback of RvNNs is that they require structured input, which makes data preparation and model implementation hard. In this paper, we propose Gumbel Tree-LSTM, a novel tree-structured long short-term memory architecture that learns how to compose task-specific tree structures only

Proposes a new way of managing flash memory space for flash memory-specific file systems based on a log-structured file system. Flash memory has attractive features such as non-volatility and fast I/O speed, but it also suffers from an inability to update in place, and limited usage cycles. These drawbacks require many changes to conventional storage (file) management techniques. Our focus is on lowering the cleaning cost and evenly utilizing flash memory cells while maintaining a balance betwee

Abstract With the recent expansion of the applicability of artificial intelligence into the creative realm, attempts are being made to use AI (artificial intelligence) in the garment development system in various ways, both in academia and the fashion business. Several IT companies have developed and possess AI-based garment design technologies that utilize StyleGAN2 for image transformation. However, they are not widely utilized in the fashion business. Since fashion brands need to create numer

Transparent and stoichiometric lead-magnesium-niobate crystals were grown by the Bridgman method. Crystals of centimeter size were obtained without material loss by employing self-seeded and seeded techniques using sealed platinum crucibles. The fastest growth direction was found to be pseudocubic 〈111〉. As-grown crystals showed a broad absorption band centered near λ=600 nm and an OH absorption near λ=2830 nm. The electrostrictive coefficient Q11 was determined to be 1.15×10−2 m4 C−2 from the m

Summary form only given. Each year companies are spending hundreds of thousands of dollars in data cleansing and other activities to improve the quality of information they use to conduct business. The hidden cost of bad data - lost opportunities, low productivity, waste, and myriads of other consequences - is believed to be much higher than these direct costs. One study estimates this combined cost due to bad data to be over U$30 billion in year 2006 alone. As business operations rely more and

지난 10년간 CPU의 속도는 메모리의 속도에 비해 급속한 속도로 발전하였다. 그 결과 데이타베이스 시스템을 포함한 다른 컴퓨터 응용분야에서 메모리의 접근이 병목현상을 일으키게 되었다. 메모리의 접근 속도를 줄이기 위해 캐시 메모리가 도입되었다. 하지만 캐시 메모리는 원하는 데이타가 캐시에 옮겨져 있어야 메모리 접근 속도를 줄일 수 있다. 때문에 응용프로그램에서 데이타를 어떤 순서로 액세스 하느냐에 따라 캐시의 활용도가 달라지고 응용프로그램의 성능이 달라지게 된다. 이 시점에서 현재 컴퓨터에서 B+-트리가 T-트리보다 더 빠르다는 사실이 알려졌다. B+-트리가 T-트리보다 캐시를 더 효율적으로 사용하기 때문이다. 또한 B+-트리를 개선하여 캐시를 더욱 효율적으로 사용하는 CSB+-트리(Cache Sensitive B+-tree)가 제안되기도 하였다. 본 논문의 목표는 T-트리가 캐시를 효율적으로 사용하도록 새로운 T-트리 구조를 개발 하는 것이다. CSB+-트리와 같이 시스템의 L2

의미정보를 이용하여 한 차원 높은 지능적 컴퓨팅 환경을 추구하는 시맨틱 웹(Semantic Web)과 집단지성, 매쉬업(mashup) 등으로 특징지어지는 웹 2.0(Web 2.0)은 차세대의 이상적인 웹을 추구하는 두 개의 핵심 축이라고 할 수 있다. 이 둘은 서로 대치되어 경쟁하는 것이 아니라 상호보완적이어서 융합을 통해 더 다양하고 획기적인 기술과 서비스를 구현할 수 있을 것으로 기대된다. 웹 2.0이 일시적인 거품이 아니라 지속적으로 변화를 주도하는 플랫폼이 되기 위해서는 한 차원 높은 다음 단계로 끌어 줄 기술과 비전이 필요한데, 시맨틱 웹이 그 역할을 해줄 수 있을 것이다. 또한 시맨틱 웹에 있어서도 그 비전의 실현과 현장에서의 적용 가능성을 담보하는 데는 웹 2.0의 환경과 응용방식이 매우 적합한 해결책이 아닐 수 없다. 본 고에서는 시맨틱 웹과 웹 2.0의 융합 기회들을 사례를 통해 살펴보고 향후 발전방향을 예견해 본다.

Porcine embryonic stem cells (pESCs) have become an advantageous experimental tool for developing therapeutic applications and producing transgenic animals. However, despite numerous reports of putative pESC lines, deriving validated pESC lines from embryos produced in vitro remains difficult. Here, we report that embryo aggregation was useful for deriving pESCs from in vitro-produced embryos. Blastocysts derived from embryo aggregation formed a larger number of colonies and maintained cell cult

Animal mucins have structural characteristics similar to human salivary mucins. Animal mucins have been regarded as suitable substances for saliva substitutes. Since animal mucin molecules in saliva substitutes and host-derived antimicrobial salivary molecules exist simultaneously in whole saliva and the pellicles of patients with dry mouth, interactions may occur between these molecules. The purpose of this study was to investigate the influence of animal mucins on peroxidase activity in soluti

For liquid rocket engine(LRE)-based space launch vehicles, longitudinal instability, often referred to as the pogo phenomenon in the literature is predicted. In the building block of system-level task, accurate dynamic modeling of a fluidfilled tank is an essential. This paper attempts to apply the virtual mass method that accounts for the interaction of the vehicle structure and the enclosed liquid oxygen to LOX-filled tanks. The virtual mass method is applied in a modal analysis considering th

Chain propagation and chain transfer in anionic polymerization of hexafluoropropylene oxide were investigated under various reaction conditions such as the stabilization of reaction temperature, the amount of hexafluoropropylene solvent, and the feeding rate of hexafluoropropylene oxide monomer. Anionic initiator for the polymerization was synthesized from cesium fluoride and hexafluoropropylene oxide in tetraethyleneglycol dimethylether. It was possible to obtain a high molecular weight poly(HF