• 대한의용생체공학회:의공학회지
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• 제43권5호
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• pp.361-368
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• 2022

The purpose of this study was to develop a hand rehabilitation training system for hemiplegic patients. We also tried to find out five hand postures (WF: Wrist Flexion, WE: Wrist Extension, BG: Ball Grip, HG: Hook Grip, RE: Rest) in real-time using multi-channel EMG-based deep learning. We performed a pre-processing method that converts to Spider Chart image data for the classification of hand movement from five test subjects (total 1,500 data sets) using Convolution Neural Networks (CNN) deep learning with an 8-channel armband. As a result of this study, the recognition accuracy was 92% for WF, 94% for WE, 76% for BG, 82% for HG, and 88% for RE. Also, ten physical therapists participated for the usability evaluation. The questionnaire consisted of 7 items of acceptance, interest, and satisfaction, and the mean and standard deviation were calculated by dividing each into a 5-point scale. As a result, high scores were obtained in immersion and interest in game (4.6±0.43), convenience of the device (4.9±0.30), and satisfaction after treatment (4.1±0.48). On the other hand, Conformity of intention for treatment (3.90±0.49) was relatively low. This is thought to be because the game play may be difficult depending on the degree of spasticity of the hemiplegic patient, and compensation may occur in patient with weakened target muscles. Therefore, it is necessary to develop a rehabilitation program suitable for the degree of disability of the patient.

• 문화기술의 융합
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• 제7권2호
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• pp.333-338
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• 2021

5세대 이동통신 기술의 발전은 이상(理想)적 초연결 사회 정보통신기술(ICT)을 가시화하고 있다. 특히 가상현실(VR)기술은 새로운 확장과 도약의 출발점에 놓여있다. 본 연구는 이러한 맥락에서 가상현실을 미디어로 규정하고, 공간과 소통이론을 중심으로 그 확장성에 대한 담론들을 수집·분석(thematic literature review)하였다. 먼저 1990년 가상현실 개념의 초기 논의들을 시작으로 개념을 정교화하였으며, 물리적 세계와 디지털 정보의 관계, 매체로서 표현과 상호작용 몰입감, 시뮬레이션, 예술창작론, 그리고 마지막으로 진화적 발전방향에 대해 논의하였다. 결론적으로 가상현실의 기술에 대한 담론들을 넘어 학술적 대상으로 가상현실의 발전과 진화를 위해 인지과학, 신경과학, 사회과학, 그리고 인문학적 쟁점(윤리, 인격 등)에 대한 이론적 프레임워크가 요구됨을 필역하였다. 즉, 가(假)를 넘어 가(加)로 넘어갈 수 있는 가상현실 진화가 논의될 시점이다.

• 한국재난정보학회 논문집
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• 제18권3호
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• pp.487-494
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• 2022

연구목적: 본 연구는 시대적 환경의 변화에 따른 경찰의 다양한 활동에 대한 성과를 효율적으로 증진시킬 수 있는 메타버스 기반 경찰교육훈련모델을 제안하고자 한다. 연구방법: HMD과 햅틱기술을 이용하여 표현되는 Avatar Controller를 생성하고, Network Interface에 접속하여 Cloud Education Server에서의 지휘통제모듈과 교육훈련콘텐츠모듈, 분석모듈 등을 통하여 개인 또는 팀 단위로 교육훈련 할 수 있다. 연구결과: 본 연구의 제안모델에서는 개인이나 팀 단위의 메타버스 기반 교육훈련 시 지휘통제모듈을 접목시킴으로써 테러나 범죄 상황 전반에 대하여 지휘감독요원들이 실시간으로 상황을 모니터링하여 지휘통제 하에 대응훈련을 하게 함으로써 팀원들 간의 유기적인 협업훈련도 가능하게 하였다. 결론: 메타버스를 기반으로 한 개인 또는 팀 단위의 경찰교육훈련은 몰입감, 상호작용 그리고 다양한 상황에서의 신속한 판단 등을 바탕으로 현실과 거의 흡사한 환경을 조성함으로써 보다 더 효율적이고 안전적인 교육훈련환경을 제공할 수 있기 때문에 향후 각국에서 메타버스를 기반으로 한 교육훈련 대응모델들은 지속적으로 성장하며 교육훈련에 있어서 새로운 대안으로 제시될 것으로 기대된다.

• 실천공학교육논문지
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• 제14권2호
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• pp.361-366
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• 2022

최근 가상증강현실 기술의 발달로 메타버스가 차세대 인터넷 시대를 주도할 새로운 패러다임으로 떠오르면서 사회나 경제적 활동이 게임, 엔터테인먼트, 음악, 콘텐츠 산업 등을 중심으로 확산 중이다. 더구나 코로나19 발생 이후 비대면 전환이 가속화되면서 생활양식과 산업현장이 언택트(Untact)화 되고 나아가 빠르게 메타버스화 되고 있다. 특히, 교육 분야에 메타버스 적용이 주목받고 있는데, 이는 아바타를 이용한 실시간 음성 대화, 3차원 오브젝트, 360도 영상 등을 활용하는 실감형 수업이 몰입도를 높여 원격 교육의 한계를 극복할 수 있기 때문이다. 본 연구에서는 메타버스의 개념을 살펴보고 메타버스를 활용한 교육이 비대면 시대에 교육의 효과를 높일 수 있는 대안이 될 수 있음을 고찰한다. 특히 언어교육에 효율적임을 보이고 실제 메타버스 기반 한국어 언어교육 프로그램을 제안한다.

• Journal of East Asia Management
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• 제3권2호
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• pp.21-41
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• 2022

This study aims to analyze the characteristics of the management situation of the Korea Railroad Corporation(KORAIL) through the management innovation process of the KORAIL and to suggest its implications for military application. Despite stable demand, the railway passenger industry had the limitation of not being able to abolish deficit routes due to public service obligations. In addition, the launch of the Suseo High-Speed Line has introduced a competitive system, posing a threat to corporate management. KORAIL wanted to overcome this crisis by innovating its management through the utilization of big data, improvement of the freight business, decentralization of demand, the introduction of tourism railroads, and development of station influence areas. By utilizing big data, KORAIL was able to optimize the railway fare system while reducing fixed costs spent on railway maintenance. It also drastically reduced the station of cargo and created a base station to pursue economies of scale. On the other hand, the existing exclusive station system was abolished to solve the chronic saturation of the downtown area, and the railway demand was moved to Gwangmyeong Station and Suwon Station to optimize the passenger supply. In particular, it developed a new business model called the tourism railway by developing the mountain Byeokjin Line, which was a chronic deficit line, and sought to improve liquidity through the development of the station influence area. Such a process of innovation at KORAIL suggests an appropriate direction in seeking ways to innovate the military medical institutions. First of all, the necessity of improving organizational immersion through the development of a personnel structure suitable for the compulsory organization, while expanding the facilities of the division and corps, and reducing the time required for medical treatment and waiting through the establishment of a data-based medical system was suggested. Next, it was also discussed to integrate the National Health Medical College, which received accreditation as a medical facility through the designation of advanced general hospitals and is ultimately under discussion with the Medical Institution. Through this, we hope that the military medical institutions, which are facing various challenges, will overcome existing limitations and be re-lighted as innovative institution that provides comprehensive public health services.

• 한국축산식품학회지
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• 제43권3호
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• pp.428-440
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• 2023

Global meat consumption is increasing worldwide, however, supply remains lacking. Several alternative protein sources, such as cultured meat, plant-based protein production, and edible insects, have been proposed to overcome this shortage. Interestingly, edible insects are characterized by superior digestive and absorptive qualities that make them the ideal replacement for traditional protein production. This study aims to further the processing ability of insect protein by investigating the effects of various pre-treatment methods, such as blanching (HB), roasting (HR), and superheated steam (HS), on the nutritional properties and physicochemical characteristics of proteins extracted from Hermetia illucens larvae. The drying rate, pH value, color analysis, amino and fatty acid profile, as well as bulk density, shear force, and rehydration ratios of the above pre-treatment methods, were explored. HS was found to have the highest drying rate and pH value analysis showed that HB and HS samples have significantly higher values compared to the other modalities. Raw edible insects had the highest value in the sum of essential amino acid (EAA) and EAA index when compared to EAAs. HB and HS showed significantly lower bulk density results, and HS showed the highest shear force and the highest value in rehydration ratio, regardless of immersion time. Therefore, taking the above results together, it was found that blanching and superheated steam blanching pre-treatment were the most effective methods to improve the processing properties of H. illucens after hot-air drying.

• Composites Research
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• 제21권2호
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• pp.8-14
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• 2008

섬유강화 복합재료는 수분에 의해 강도저하가 발생하며 이로 인하여 파괴가 발생하여 인적 물적 피해를 야기하고있다. 본 논문에서는 흡습에 의한 강도저하의 원인을 규명하고자 하였다. 먼저 수분이 복합재료에 흡수되는 메커니즘을 가정하였다. 흡수 메커니즘은 step 1, step 2, 그리고 step 3로 구분하였다. 이 메커니즘을 증명하기 위하여 강화섬유 및 수지의 종류, 수분이 흡수되는 시간 등의 조건을 다르게 하여 시험을 하였으며 그 결과 건조에 의해 인장강도가 회복되는 가역(reversible)반응과 건조로 인해 회복이 불가능한 비가역(irreversible)반응이 모두 작용함을 알 수 있었다. 강도저하는 흡습율 2.5% 에서 거의 완료되며, 흡습율이 4%에 이르면 비가역반응에 의한 강도저하가 많이 작용하여 강도회복이 적어지는 경향을 보였다.

• 마이크로전자및패키징학회지
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• 제30권2호
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• pp.13-20
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• 2023

마이크로 전자기계 시스템 공정에서 표면 처리는 공정 방법의 일환이자 디바이스에 자체적인 기능을 부여하는 역할을 한다. 특히 자기 조립 단분자층은 마이크로 전자기계 시스템 공정에서 표면 개질 및 기능화를 수행하는 표면처리 방법으로 침지 시간과 용액 농도에 따라 강도를 정밀하게 조절할 수 있는 유기 단분자막이다. 고분자 기판이나 금속/세라믹 부품에 자발적으로 흡착되어 형성되는 자기 조립 단분자층은 표면 특성의 개질 뿐만 아니라 나노스케일 단위의 높은 정밀도로 하여금 양산용 리소그래피 기술 및 초민감 유기/생체분자 센서에도 응용되고 있다. 본 논문에서는 마찰 특성의 조절부터 생체 분자의 탐침 기능까지 자기 조립 단분자층 기술이 발전되어 응용되고 있는 다양한 분야들에 대해 소개한다.

• 천문학회보
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• 제44권2호
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• pp.50.2-50.2
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• 2019

We present the results of high-resolution (R ≥ 30,000) optical and near-infrared spectroscopic monitoring observations of a FU Orionis-type object, 2MASS J06593158-0405277. We have monitored 2MASS J06593158-0405277 with the Bohyunsan Optical Echelle Spectrograph (BOES) and the Immersion GRating INfrared Spectrograph (IGRINS) since December 2014. Various features produced by wind, disk, and outflow/jet were detected. The wind features varied over time and disappeared about a year after the outburst occurred. The double-peaked line profiles were detected in the optical and near-infrared, and the line widths decrease with increasing wavelength. The disk features in the optical spectra are fit well with G2-type or G5-type stellar spectra convolved with a disk rotational profile of about 45 km s^-1, which corresponds to a disk radius of about 71 R_⊙for a central mass of 0.75 M_⊙. Disk features in near-infrared spectra are fit well with a K1-type stellar spectrum convolved with a disk rotational profile of about 35 km s^-1, which corresponds to a disk radius of about 117 R_⊙ for a central mass of 0.75 M_⊙. We also detected [S II] and H2 emission lines, which are rarely found in FUors but are usually found in the earlier stage of young stellar objects. Therefore, we suggest that 2MASS J06593158-0405277 is in the relatively earlier part of Class II stage.

• Restorative Dentistry and Endodontics
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• 제46권4호
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• pp.47.1-47.9
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• 2021

Objectives: This study aimed to use a laboratory model to evaluate the efficacy of an experimental bleaching agent. Materials and Methods: The model used human extracted molars that were treated and measured for bleaching efficacy. Teeth (n = 50) were distributed into 5 groups: Negative control (NC): immersion in water for 8 hours; Nanofibers (NFs): Experimental titanium dioxide nanofibers with stirring and light activation for 8 hours; Whitestrips (WS): Crest 3D White Glamorous White Whitestrips, 2 applications daily for 30 minutes, 14 days; 1% hydrogen peroxide (HP) standard: 1% hydrogen peroxide for 8 hours; and 30% HP standard: 30% hydrogen peroxide for 8 hours. Instrumental measurements were performed using a spectrophotometer. Results were recorded at baseline, 1-day post-bleaching, and 1-week post-bleaching. Kruskal-Wallis procedure was used to determine differences in color change. Pearson correlation was used to evaluate the relationship between visual and instrumental measurements. Tests of hypotheses were 2-sided with alpha = 0.05. Results: There was no significant difference in color parameters (L1, a1, b1, and shade guide units [SGU]) at baseline (p > 0.05). There was a significant difference among the groups for overall color change (ΔE^*ab) and change in shade guide units (ΔSGU) at 1-day and 1-week post-bleaching (p < 0.05). The higher the HP concentration, the higher the color change as expressed in ΔSGU and ΔE^*ab. The negative control exceeded the perceptibility threshold of ΔE^* = 1.2 regardless of time point. NFs showed a decrease in chroma, but were not statistically different compared to the negative control. Conclusions: The laboratory model was successful in screening an experimental bleaching agent.