• Transactions of Materials Processing
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• v.15 no.8 s.89
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• pp.615-620
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• 2006

The reduction behavior of $TiO_{2}$ in Al and Al/CaSi containing self-reducing $TiO_{2}$ briquettes(SRTB) was investigated. The maximum yield of Ti was expected with the slag composition of 45-55%CaO in the $CaO-Al_{2}O_{3}$ system. When $CaCO_{3}$ was used as a flux, the oxidation loss of reducing agent by $CO_{2}$ should be compensated, and therefore it leads to excessive requirement of the reducing agent. By using Al and CaSi mixture as a reducing agent of $TiO_{2}$, the reaction products both oxide and metal could be liquefied, and separated effectively with each other. As a result, the yield of Ti increases remarkably. The optimum mixing ratio of CaSi to Al is 78%CaSi-22%Al.

• Korean Journal of Pharmacognosy
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• v.51 no.2
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• pp.122-130
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• 2020

To investigate the anti-inflammatory effect on Degenerative Osteoarthritis, Male sprague-Dawley rats were randomized and classified into three different concentration groups. We measured weekly weight change, dietary intake, drinking water intake, blood analysis like TNF-α (tumor necrosis factor-α), IL-6 (interleukin 6), TIMP-1 (tissue inhibitor of metalloprotease-1), MMP-2 (matrix metalloprotease-2), MMP-9 (matrix metalloprotease-9) and micro CT analysis. The results suggest that the treatment with herbal complex HP-04 improved the Monosodium iodoacetate (MIA) induced degenerative osteoarthritis and it could be applicable for the improvement of arthritic symptoms as a new therapeutic agent.

• The Korean Journal of Pain
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• v.8 no.2
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• pp.341-346
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• 1995

Piriformis Syndrome is characterized by pain of the low back, groin, perineum, buttock, hip, posterior thigh, leg and foot. Symptoms are aggravated by sitting, prolonged combination of hip flexion, adduction, the medial rotation, or by activity. In addition, patient may complain of painful swelling of the limb and sexual dysfunction-dyspareunia in female, and impotence in male. It currently appears that three specific conditions may contribute to the piriformis syndrome: (a) myofascial pain; (b) nerve and vascular entrapment; (c) dysfunction of the sacroiliac joint. The important keys of diagnosis are history and physical examination. There is no known objective diagnostic method. We described the clinical features of four cases of piriformis syndrome and reviewed foreign literature.

• The Korean Journal of Pain
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• v.8 no.2
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• pp.319-323
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• 1995

The implication of cervical pain associated with an elongated styloid process is credited to W.W.Eagle. Even though there were earlier reports of ossification of the stylohyoid ligament, findings in more than 200 cases in 1980s and 1940s resulted in the naming of a clinical syndrome that continues to bear his name, Eagle's syndrome. It is also sometimes called styloid process neuralgia or elongated styloid process syndrome is more common than generally recognized. The clinical symptoms range from a dull nagging pain with occasional radiation to ear, or to a foreign body sensation. Dysphagia and odynophagia may also occur. We successfully treated one case by removal of the elongated styloid process under the general anesthesia and C2 ganglion block. We then reported the clinical feature of one case of the Eagle's syndrome and further researched with the foreign literature.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.11
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• pp.117-123
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• 2013

By exploiting the regular read and write access patterns of embedded SRAM memories inside Viterbi decoder, the memory architecture can be efficiently modified to reduce the power consumption of write operation. According to the experimental results with 65nm CMOS process, the proposed embedded memory used for Viterbi decoder achieves 30.84% of power savings with 8.92% of area overhead compared to the conventional embedded SRAM approaches.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.53-56
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• 2000

무제한 어휘 음성합성 시스템의 문-음성 합성기는 합성음의 자연감을 높이기 위해 여러 가지 방법을 사용하게되는데 그중 하나가 자연음에 내재하는 운을 법칙을 정확히 구현하는 것이다. 합성에 필요한 운율법칙은 언어학적 정보를 이용해 구현하거나, 자연음을 분석해 구한 운을 정보로부터 운율 법칙을 추출하여 합성에 이용하고 있다. 이와 같이 구한 운을 법칙이 자연음에 존재하는 운율 법칙을 전부 반영하지 못했거나, 잘못 구현되는 경우에는 합성음의 자연성이 떨어지게 된다. 이런 점을 고려하여 우리는 자연음의 운율 정보를 이용해 인공 신경망을 훈련시켜, 문장단위 운율을 발생시킬 수 있는 방식을 제안하였다. 운율의 세 가지 요소는 피치, 지속시간, 크기 변화가 있는데, 인공 신경망은 문장이 입력되면, 각 해당 음소의 지속시간에 따른 피치 변화와 크기 변화를 학습할 수 있도록 설계하였다. 신경망을 훈련시키기 위해 고립 단어 군과 음소균형 문장 군을 화자로 하여금 발성하게 하여, 녹음하고, 분석하여 구한 운을 정보를 데이터베이스로 구축하였다. 문장 내의 각 음소에 대해 지속시간과 피치 변화 그리고 크기 변화를 구하고, 곡선적응 방법을 이용하여 각 변화 곡선에 대한 다항식 계수와 초기치를 구해 운을 데이터베이스를 구축한다. 이 운을 데이터베이스의 일부를 인공 신경망을 훈련시키는데 이용하고, 나머지를 이용해 인공 신경망의 성능을 평가한 결과 운을 데이터베이스를 계속 확장하면 좀더 자연스러운 운율을 발생시킬 수 있음을 관찰하였다.

• Journal of Korea Society of Digital Industry and Information Management
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• v.17 no.4
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• pp.53-62
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• 2021

Deep learning models such as convolutional neural networks and recurrent neual networks process a huge amounts of data, so they require a lot of storage and consume a lot of time and power due to memory access. Recently, research is being conducted to reduce memory usage and access by compressing data using the feature that many of deep learning data are highly sparse and localized. In this paper, we propose a compression-decompression method of storing only the non-zero data and the location information of the non-zero data excluding zero data. In order to make the location information of non-zero data, the matrix data is divided into sections uniformly. And whether there is non-zero data in the corresponding section is indicated. In this case, section division is not executed only once, but repeatedly executed, and location information is stored in each step. Therefore, it can be properly compressed according to the ratio and distribution of zero data. In addition, we propose a hardware structure that enables compression and decompression without complex operations. It was designed and verified with Verilog, and it was confirmed that it can be used in hardware deep learning accelerators.

• The Journal of Small Business Innovation
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• v.19 no.2
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• pp.17-36
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• 2016

The current paper examines the role of the identity of entrepreneurs in the emergence and evolution of a new organizational form by empirically analyzing the evolution of eBook publishers in Korea from 1996 to 2011. Drawing on the recently developed identity-based theory of organizational form in the organizational ecology literature, we test hypotheses on the effects of focused and diffused organizational identities on organizational founding in an emergent organizational population. The results of our empirical analysis that tested three hypotheses about a positive relationship between focused identity and form emergenceand negative relationships between diffused (horizontal and vertical) identity and form emergence largely supported the argument of identity-based entrepreneurship. General implications are discussed.

• Resources Recycling
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• v.17 no.2
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• pp.46-54
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• 2008

It is well known that PCB (Printed Circuit Board) is a complex mixture of various metals. In this study, pyro-metallurgical process was investigated to extract valuable metallic components from the PCB scrap. PCB scrap was shredded and oxidized to remove plastic materials, and then, quantitative analysis were made. 15 mass %$Al_2O_3-45$ mass %CaO-40 mass %$SiO_2$ and 32 mass %$SiO_2-20$ mass %$Al_2O_3-38$ mass %CaO-10 mass %MgO, were chosen as basic slag compositions which are determined based on the quantitative analysis of PCB scrap. During experiments a super kanthal rotating furnace was used to melt and separate metallic components. Moreover the revolution effect on was the recovery of valuable metals from PCB scrap also investigated.

• Journal of IKEEE
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• v.18 no.1
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• pp.165-171
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• 2014

This paper presents a low complexity QR decomposition (QRD) architecture for MIMO detector. In the proposed approach, various CORDIC-based QRD algorithms are efficiently combined together to reduce the computational complexity of the QRD hardware. Based on the computational complexity analysis on various QRD algorithms, a low complexity approach is selected at each stage of QRD process. The proposed QRD architecture can be applied to any arbitrary dimension of channel matrix, and the complexity reduction grows with the increasing matrix dimension. Our QR decomposition hardware was implemented using Samsung $0.13{\mu}m$ technology. The numerical results show that the proposed architecture achieves 47% increase in the QAR (QRD Rate/Gate count) with 28.1% power savings over the conventional Householder CORDIC-based architecture for the $4{\times}4$ matrix decomposition.