• Journal of Ceramic Processing Research
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• 제19권5호
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• pp.434-438
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• 2018

The sintering behavior of $BaFe_{12}O_{19}$ with the addition of one and three weight % of $CuWO_4$ as a liquid phase sintering aid is studied. Samples are sintered in the temperature range $900-1250^{\circ}C$ and the effect of $CuWO_4$ addition on density, microstructure, phase composition and magnetic properties is examined. Compared to $BaFe_{12}O_{19}$ with no sintering aid addition, addition of 1 wt % $CuWO_4$ retards densification. Addition of 3 wt % $CuWO_4$ promotes densification at lower sintering temperatures but retards densification at temperatures > $1050^{\circ}C$. Three wt % $CuWO_4$ addition induces the formation of $BaWO_4$ and $Ba_3WFe_2O_9$ secondary phases at temperatures ${\geq}1100^{\circ}C$. Addition of $CuWO_4$ causes a decrease in saturation magnetization, remanent magnetization and coercivity.

• Journal of Microbiology and Biotechnology
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• 제4권2호
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• pp.141-145
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• 1994

Conventional commercial thermal process for preparing Sikhae (Rice beverage) in a hermetically sealed container was evaluated to solve the nutritional deterioration and organoleptic inferiority problem caused by severe heat treatment. A milder thermal process with an aid of Nisin, a GRAS-grade, selectively germicidal compound, was introduced to destroy the putrefactive microorganisms. In this experiment, hot-filling method with Nisin, and thermal processing (at 110$^{\circ}C$ for 15 minutes with Nisin, at 121$^{\circ}C$ for 25 minutes without Nisin) were compared. The quality of Sikhae could be enhanced and over 90% of the thermal process could be conserved by this process in terms of sterilizing value without quality deterioration when processing the bottled Sikhae at 110$^{\circ}$ for 15 minutes $\{(F^{10}{_{121})_{process}=1.54\}$.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2003년도 춘계학술발표논문집 (중)
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• pp.839-842
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• 2003

경매 개념을 도입한 쇼핑몰의 경우 제품 판매자가 원하는 가격을 제시하고 그 가격에 근접하는 형태로 구매자들끼리 가격 협상을 벌인다. 경매 개념이 도입된 쇼핑몰은 구매자들에게 좀 더 저렴하게 제품을 구매할 수 있도록 하는 장점을 제공하고 있다. 그러나, 대부분의 제품이 경매 종료 시점에 입찰하여 물건을 구입해야 하는 문제점을 가지고 있다. 본 논문에 구현한 OAAS 시스템은 사용자가 경매사이트를 통해 물건을 구매하는 경우 경매 종료 시점에 직접 접속하여 경매에 참여해야 하는 문제점을 제거하였으며, 사용자가 지정한 조건을 가지고 입찰에 참여하여 제품을 낙찬 반을 수 있도록 하여 사용자의 편이성을 증가시켰다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.346-349
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• 2011

In this paper, we design a perceptually invisible dot pattern layout and its recognition scheme, and we apply the recognition scheme into a smart self learning aid for interactive learning aid. To increase maximum information capacity and also increase robustness to the noises, we design a ECC (error correcting code) based dot pattern with directional vector indicator. To make a smart self-learning aid, we embed the micro dot pattern (20 information bit + 15 ECC bits + 9 layout information bit) using K ink (CMYK) and extract the dot pattern using IR (infrared) LED and IR filter based camera, which is embedded in the smart pen. The reason we use K ink is that K ink is a carbon based ink in nature, and carbon is easily recognized with IR even without light. After acquiring IR camera images for the dot patterns, we perform layout adjustment using the 9 layout information bit, and extract 20 information bits from 35 data bits which is composed of 20 information bits and 15 ECC bits. To embed and extract information bits, we use topology based dot pattern recognition scheme which is robust to geometric distortion which is very usual in camera based recognition scheme. Topology based pattern recognition traces next information bit symbols using topological distance measurement from the pivot information bit. We implemented and experimented with sample patterns, and it shows that we can achieve almost 99% recognition for our embedding patterns.

• Journal of Animal Science and Technology
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• 제65권5호
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• pp.1014-1023
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• 2023

The aim of this study was to investigate the effect of incorporating black soldier fly (BSF) larvae and its processed form as an alternative source of protein to fish meal (FM) on the digestibility of amino acids (AA) in weaned pigs. Four cannulated pigs with an initial bodyweight of 13.25 ± 0.25 kg and aged 30 days were subjected to a 4 × 4 Latin square design with three treatments, as well as a nitrogen-free treatment. The diets used for each treatment consisted of a FM diet, a diet containing BSF larvae meal (BSFM), and a diet containing extruded BSF (BSFE). The study was conducted over four stages, with a total duration of 28 days. The apparent ileal digestibility (AID) of protein was higher in the FM treatment compared with the BSFM. Among essential AA, the AID of Arg, His, Leu, and Thr were higher in the FM compared with the BSFM and BSFE. A greater AID of Ile and Phe was observed in pigs in the FM treatment compared with the BSFM. The average AA digestibility did not show any difference between treatments. Among non-essential AA, the AID of Ala (p = 0.054) and Glu (p = 0.064) tended to be increased in the FM compared with the BSFM. Among essential AA, the standardized ileal digestibility (SID) of Arg, His, Ile, and Leu were higher in the FM compared with the BSFM. Among non-essential AA, the SID of Cys (p = 0.074) tended to be increased in the FM compared with the BSFM. In conclusion, the processing and thermal conditioning techniques utilized for BSF larvae meal showed a tendency for increased AA digestibility. Therefore, when formulating a diet, it is important to take into account the difference in AA digestibility between FM and BSFM.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 춘계학술대회
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• pp.342-344
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• 1997

Owing to technical advances in very large-scale integrated circuits (VLSI), high-speed digital signal processing (DSP) chips become fast enough to allow for real-time implementation of hearing aid algorithms in units small enough to be wearable. In this paper, we present a digital hearing aid processor (DHAP) chip built around a general-purpose 16-bit DSP core. The designed DHAP performs a nonlinear loudness correction of 8 octave frequency bands based on audiometric measurements. By employing a programmable DSP, the DHAP provides all the flexibility needed to implement audiological algorithms. In addition, the has a low power feature and $5.410\times5.720mm^2$ dimensions that fit for wearable devices.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제11권4호
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• pp.149-156
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• 2022

최근 전 세계적으로 COVID-19이 유행하는 상황 속에서 이와 관련된 가짜뉴스가 심각한 사회적 혼란을 야기하고 있다. 이러한 배경에서 가짜뉴스를 정확하게 탐지하기 위해, 뉴스가 소셜 미디어를 통해 파급되는 과정과 같은 소셜 컨텍스트 정보를 활용하는 소셜 컨텍스트 기반 탐지 기법들이 널리 사용되고 있다. 그러나 대부분의 기 구축된 가짜뉴스 탐지를 위한 데이터들은 뉴스 자체의 내용 정보 위주로 구성되어, 소셜 컨텍스트 정보를 거의 포함하지 않는다. 즉, 이 데이터들에는 소셜 컨텍스트 기반 탐지 기법을 적용할 수 없으며, 이러한 데이터의 한계는 가짜뉴스 탐지 연구 분야의 발전을 저해하는 방해 요소이다. 본 논문은 이러한 한계를 극복하기 위해, 기존의 저명한 가짜뉴스 데이터인 CoAID 데이터를 기반으로, 소셜 컨텍스트 정보를 추가적으로 수집하여, CoAID 데이터의 뉴스 내용 정보와 해당 뉴스들의 소셜 컨텍스트 정보를 모두 포함하는 CoAID⁺ 데이터를 구축한다. 본 논문에서 구축한 CoAID⁺ 데이터는 기존의 대부분의 소셜 컨텍스트 기반 탐지 기법들에 적용될 수 있으며, 향후 새로운 소셜 컨텍스트 기반 탐지 기법들에 대한 연구도 더욱 활성화시킬 수 있을 것으로 기대된다. 마지막으로, 본 논문은 다양한 관점에서 CoAID⁺ 데이터를 분석하여 진짜뉴스와 가짜뉴스의 파급 패턴 및 키워드에 따른 파급 패턴도 파악하여 소개한다.

• Journal of Audiology & Otology
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• 제25권3호
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• pp.146-151
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• 2021

Background and Objectives: The relationship between hearing aid (HA) use and improvement in cognitive function is not fully known. This study aimed to determine whether HAs could recover temporal resolution or hearing in noise functions. Materials and Methods: We designed a prospective study with two groups: HA users and controls. Patients older than 45 years, with a pure tone average threshold of worse than 40 dB and a speech discrimination score better than 60% in both ears were eligible. Central auditory processing tests and hearing in noise tests (HINTs) were evaluated at the beginning of the study and 1, 3, 6, and 12 months after the use of a monaural HA in the HA group compared to the control group. The changes in the evaluation parameters were statistically analyzed using the linear mixed model. Results: A total of 26 participants (13 in the HA and 13 in the control group) were included in this study. The frequency (p<0.01) and duration test (p=0.02) scores showed significant improvements in the HA group after 1 year, while the HINT scores showed no significant change. Conclusions: After using an HA for one year, patients performed better on temporal resolution tests. No improvement was documented with regard to hearing in noise.

• 대한청각학회지
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• 제25권3호
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• pp.146-151
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• 2021

Background and Objectives: The relationship between hearing aid (HA) use and improvement in cognitive function is not fully known. This study aimed to determine whether HAs could recover temporal resolution or hearing in noise functions. Materials and Methods: We designed a prospective study with two groups: HA users and controls. Patients older than 45 years, with a pure tone average threshold of worse than 40 dB and a speech discrimination score better than 60% in both ears were eligible. Central auditory processing tests and hearing in noise tests (HINTs) were evaluated at the beginning of the study and 1, 3, 6, and 12 months after the use of a monaural HA in the HA group compared to the control group. The changes in the evaluation parameters were statistically analyzed using the linear mixed model. Results: A total of 26 participants (13 in the HA and 13 in the control group) were included in this study. The frequency (p<0.01) and duration test (p=0.02) scores showed significant improvements in the HA group after 1 year, while the HINT scores showed no significant change. Conclusions: After using an HA for one year, patients performed better on temporal resolution tests. No improvement was documented with regard to hearing in noise.

• 정보처리학회논문지B
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• 제11B권7호
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• pp.793-802
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• 2004

3차원 가상환경은 시각정보 위주의 제한적인 정보를 제공한다 이는 사용자가 환경 안에서 방향을 상실하게 되는 원인이 된다. 이를 보완하기 위해 여러 가지 방법의 탐색항해 도구에 대한 연구가 진행 되었다. 본 연구에서는 시맨틱 웹 구축 기술의 하나인 토픽맵 기법을 3차원 가상환경에 적용하여 탐색항해 도구를 설계했다. 토픽맵은 토픽과 토픽 사이의 연결 관계를 정의함으로 의미적 연결지도를 구축한다. 이를 적용한 탐색항해 도구의 활용성 실험에서 대표성이 높은 목표 보다는 세밀한 목표를 찾을 때 효과적으로 탐색항해에 도움이 되고 있음을 보여주었다. 또한 찾고자 하는 목표가 정확하지 않은 상태에서의 탐색항해에서 주제에 관련된 주변 지식의 제공은 사용자의 목표 선택에 효과적임을 확인할 수 있었다.