데이터 글러브를 이용한 손 제스처 기반 3차원 게임 구현

유다연,권차욱,곽지민,백화현,김이조,차경애 대구대학교 정보통신연구소 2010 情報通信硏究 Vol.7 No.1

데이터 글러브(Data Glove)는 손 제스처를 정의하여 시스템을 제어하는 입력장치로 가상현실기술 및 교육, 의료, 산업분야에서 많이 사용되고 있다. 이는 가상현실 속에 존재하는 사물을 현실에서 제어하게 함으로써 사용자에게 마치 현실 세계의 사물을 제어하는 느낌을 주는 장점을 가지고 있다. 이에 본 논문에서는 이러한 데이터 글러브의 장점을 이용하여 3차원 게임에 적용시키는 방법을 제안한다. 먼저 데이터 글러브로 제스처를 정의하고, 트래커(Tracker)와 연동하여 시스템을 구현한다. 구현된 시스템을 실험하기 위해서 OpenGL로 인형 뽑기 게임을 구현하고 사용자가 데이터 글러브를 착용 후 정의된 제스처를 통해 게임을 제어하도록 한다. 본 논문에서 제안한 방법은 사용자들에게 좀 더 높은 몰입감을 제공하며, 향후 게임 산업 발전에도 많은 영향을 줄 것으로 기대한다.

유아교육평가의 새로운 대안 : 포트폴리오 연구

박정민,윤애희,조화연 경복대학 1999 京福論叢 Vol.3 No.-

본 고에서는 표준화 검사의 문제점을 보완하고, 교육 평가의 결과를 교육과정 속에 통합시킬 수 있으며,유아들의 수행정도를 적절히 평가할 수 있다고 제시되는 새로운 평가 방법인 수행 평가의 개념에 대해 살펴보고, 90년대 이후 수행평가의 한 유형으로 새롭게 부각되고 있는, 포트폴리오 평가를 고찰하여 유아교육의 새로운평가방안에 대해 모색해보고자 한다. 수행평가는 학생 스스로가 다양한 현실상황 및 장면속에서 자신의 경험을 재구성할 수 있는 능력이 어느 정도인지를 평가하기 위해서 설계된 평가방안을 가리킨다. 수행평가에서는 구체적인 상황속에서 직접적인 수행을 통해서 평가가 진행되기 때문에 고등 사고기능, 인지구조의 변화, 학습의 과정 등을 효율적으로 평가하는데 유리하다. 수행 평가의 형태로는 에세이, 작문, 프로젝트, 포트폴리오 등이 있으며, 포트폴리오 평가는 수행 평가의 유형 가운데 가장 관심이 집중되고 있는 평가 방법이다. 포트폴리오 평가는 평가 그 자체가 교수(instruction)라는 측면은 유아들의 발달이 통합적으로 교육과정 속에 포함되는 유아교육기관에서는 매우 시사적인 것이다. 전통적인 평가 방식인 표준화 검사는 유아들의 발달과 학습의 진행과정을 적절히 측정할 수 없다는 제한점을 가진다. 따라서 다른 어떤 학교기관보다 더 유아교육기관에서는 유아들의 통합적인 발달 양상을 잘 반영할 수 있는 수행평가 방법이 요청된다. 이 점에서 학습자의 학습 과정과 정태적인 측면을 누적적으로 평가할 수 있는 포트폴리오 평가 방법은 유아들의 발달특징과 통합적으로 운영되는 유아교육과정과 가장 잘 조화를 이루는 평가 방법이다. 그러나 교사들의 평가 방법에 대한 지식의 부족과 인식의 결여는 유아들의 행동을 적절히 평가하여 이해할 수 있는 수많은 순간들을 놓치고 있다. 따라서 포트폴리오 평가의 유아교육기관의 적용을 위해서는 교사교육을 통한 인식의 전환이 필요하다고 본다. 유아교육기관의 교사들은 학습자에 대한 풍부한 정보를 제공하는 포트폴리오 평가를 교수 상황에 적용함으로서 유아들을 바르게 이해하는데 도움을 얻을 수 있을 것이다. The purpose of this study review the concept of performance assessment for level of performance for young children and complement problem standard test and intergrate the result of educational evaluation in curriculum and study newly reliefed portfolio assessment for earft childhood education. Pertformance assessment means designed assessment method for assess young children's ability to reconstruct their experience in variaty context. Performance assessment is useful to assess higher thinking funtioning, the change of cognitive structure, the process of learning because assess directly performance in concretly context. Type of Performance assessment are essay, wrinting, project, portfolio etc. The method of traditional assessment, standard test have not appropriately assess to development of young children and the process of learning. Kindergaten and day care center desire more performance assessment than another school system because it is assessed to total development aspect for children. Therefore performance assessment match with development of for young children and integrated curriculum. Teachers is missing much moment in young children's behavior to understand because they are lack of knowledge and perception in the method of assessment. For portfolio apply easy educational field is asked inservice training for change of perception in teachers. Teachers could have to get many information of learner and to correctly understand young children through portfolio.

The Unreliability of MTT Assay in the Cytotoxic Test of Primary Cultured Glioblastoma Cells

Jo, Hwa Yeon,Kim, Yona,Park, Hyung Woo,Moon, Hyo Eun,Bae, Seongtae,Kim, JinWook,Kim, Dong Gyu,Paek, Sun Ha The Korean Society for Brain and Neural Science 2015 Experimental Neurobiology Vol.24 No.3

<P>MTT assay is commonly used to assess the cellular cytotoxicity caused by anticancer drugs in glioblastomas. However, there have been some reports insisting that MTT assay exhibited non-specific intracellular reduction of tetrazolium which led to underestimated results of cytotoxicity. Here, we examine whether or not MTT assay can lead to incorrect information regarding alcohol-induced cytotoxicity on immortalized and primary glioblastoma cells. MTT assay was applied to assess the ethanol-induced cytotoxicity at various ethanol concentrations. The cellular cytotoxicity induced by different doses of ethanol was analyzed and compared through several cytotoxic assays. Ethanol-induced cytotoxicity observed through MTT assay on both cell types was shown to be ethanol dose-dependent below a 3% concentration. However, the cytotoxicity was shown to be markedly underestimated only in primary cells at a 5% concentration. RT-PCR and Western Blot showed increased expressions of pro-apoptotic proteins and decreased expressions of anti-apoptotic proteins in an ethanol dose-dependent manner in both cell types. Furthermore, we present a possible mechanism for the unreliable result of MTT assay. A high concentration of ethanol induces more severe membrane damage and increased intracellular concentration of NADH in primary cells which enhances the nonspecific reduction of tetrazolium salt. Together, our findings demonstrate that the cytotoxicity on primary cells could inaccurately be assessed when detected through MTT assay. Therefore, a careful interpretation is needed when one would analyze the cytotoxic results of MTT assay, and it is suggested that other assays must be accompanied to produce more reliable and accurate cytotoxic results on primary glioblastoma cells.</P>

Single elementary target-sputtered Cu₂ZnSnSe₄ thin film solar cells

Jo, Yeon Hwa,Mohanty, Bhaskar Chandra,Yeon, Deuk Ho,Lee, Seung Min,Cho, Yong Soo Elsevier 2015 Solar energy materials and solar cells Vol.132 No.-

<P><B>Abstract</B></P> <P>A simple single elementary target sputtering method is proposed as an alternative to the multi-target sputter approach for preparing Cu<SUB>2</SUB>ZnSnSe<SUB>4</SUB> absorber films. Several single targets utilizing excess Cu and Zn, including Cu<SUB>2</SUB>ZnSnSe<SUB>4</SUB>, Cu<SUB>2</SUB>Zn<SUB>1.5</SUB>SnSe<SUB>4</SUB>, Cu<SUB>2.5</SUB>Zn<SUB>1.5</SUB>SnSe<SUB>4</SUB> and Cu<SUB>3</SUB>Zn<SUB>1.5</SUB>SnSe<SUB>4</SUB>, were investigated to determine the absorber film with the most promising structural and photovoltaic performance. A conversion efficiency of ~4.16% was obtained from the Cu<SUB>2.5</SUB>Zn<SUB>1.5</SUB>SnSe<SUB>4</SUB> single target, which displayed well-defined grain structures with desirable Zn/Sn and Cu/(Zn+Sn) ratios. Critical roles of excess Cu and Zn during sputtering are discussed in conjunction with microstructural evolution, elemental distribution, photovoltaic characteristics and grain boundary contributions, which are specified for the sputtering method.</P> <P><B>Highlights</B></P> <P> <UL> <LI> First attempt of single elementary target-sputtering of Cu<SUB>2</SUB>ZnSnSe<SUB>4</SUB> thin films. </LI> <LI> Excess Cu and Zn in sputter targets are essential for quality cells. </LI> <LI> A conversion efficiency of ~4.16% was obtained for excess Cu/Zn target. </LI> <LI> TEM/AES line profiles reveal elemental distributions over the absorber. </LI> <LI> Surface potential by AFM confirms the benefit of the excess Cu/Zn target. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Gadolinium Zinc Borate Glass-Based Low Temperature Co-fired Ceramics

Yeon Hwa Jo,Deuk Ho Yeon,Bhaskar C. Mohanty,Yong Soo Cho 대한금속ᆞ재료학회 2008 METALS AND MATERIALS International Vol.14 No.4

삼킴곤란과 위식도 역류 증상을 가진 환자에서 호산구 식도염의 유병률

유연화 ( Yeon Hwa Yu ),조윤주 ( Yun Ju Jo ),정미연 ( Mi Yeon Jung ),손병관 ( Byoung Kwan Son ),전대원 ( Dae Won Jun ),김성환 ( Seong Hwan Kim ),박영숙 ( Young Sook Park ),이원미 ( Won Mi Lee ),김은경 ( Eun Kyoung Kim ) 대한소화기기능성질환·운동학회 2009 Journal of Neurogastroenterology and Motility (JNM Vol.15 No.1

목적: 성인에서의 호산구 식도염은 삼킴곤란과 음식 막힘, 치료가 잘되지 않는 위식도역류질환 환자에서는 반드시 고려해야 할 질환이다. 본 연구의 목적은 삼킴곤란과 위식도 역류질환과 관련된 증상에서 호산구 식도염의 빈도를 고찰하는 것이다. 대상 및 방법: 을지의과대학 을지병원에서 2007년 7월부터 2009년 2월까지 삼킴곤란, 음식 막힘, 양자펌프 억제제에 반응없는 위식도역류질환이 의심이 되는 환자를 대상으로 중부식도를 포함하여 조직 검사를 시행하였다. 결과: 연구에 포함된 환자는 108명이었으며, 호산구 식도염으로 진단받은 환자는 2명(1.8%)이었다. 그 외, 호산구 위장관염 2예, 약제 의인성 호산구 위장관염 1예가 있었다. 주된 증상은 삼킴곤란(37.9%), 상복부 통증(25.9%), 역류(23.1%) 순이었다. 대상 환자의 내시경 소견은 Z-line blurring (28.7%), 정상(17.5%), 발적(16.6%) 등 이었으나, 호산구 침착을 보이는 경우는 동심원 주름, 종축 방향의 골, 다수의 점막 결절 혹은 흰색 반점 등이 보였다. 조직 소견은 경한 만성 염증(33.3%), 상피 세포 증식(16.6%), 호산구 침착(3.7%) 등이었다. 결론: 국내에서 삼킴곤란과 역류 관련 식도 증상을 환자에서 호산구 식도염의 유병률은 1.8%였으며, 증상과 내시경 소견을 염두에 두고, 호산구 관련 위장 질환진단에 생검을 적극 활용하여야겠다. Background/Aims: In adult patients with dysphagia, food impaction and non-responsiveness to proton pump inhibitor, eosinophilic esophagitis (EoE) should be considered. We aimed to investigate the prevalence of EoE in Korean patients. Methods: From July 2007-February 2009, 108 patients presenting with dysphagia and reflux related symptoms were enrolled. The mid-esophageal region was randomly biopsied. Results: Of the 108 patients, two cases of EoE, two cases of eosinophilic enterocolitis and one case of drug-induced eosinophilic enterocolitis were diagnosed. The most frequent symptom was dysphagia (37.9%), followed by epigastric pain (25.9%) and regurgitation (23.1%). Endoscopic findings of eosinophilic infiltration in the esophagus were ring esophagus, linear furrow, nodularities and whitish patches. Histologic findings showed chronic inflammation (33.3%), epithelial cell hyperplasia (16.6%), eosinophilic infiltration (3.7%) and a few eosinophil infiltration (1.8%). Conclusions: EoE was detected in 1.8% in Korean patients with dysphagia and reflux related symptoms. Esophageal random biopsy should be considered especially in young patients with a history of allergic disease and esophageal symptoms. (Kor J Neurogastroenterol Motil 2009;15:15-22)

Effects of various toothpastes on remineralization of white spot lesions

Su-Yeon Jo,Hyun-Jeong Chong,Eon-Hwa Lee,Na-Young Chang,Jong-Moon Chae,Jin-Hyoung Cho,Sang-Cheol Kim,Kyung-Hwa Kang 대한치과교정학회 2014 대한치과교정학회지 Vol.44 No.3

Objective: The purpose of this in vitro study was to examine the effects of fluoridated, casein phosphopeptide?amorphous calcium phosphate complex (CPP-ACP)-containing, and functionalized β-tricalcium phosphate (fTCP)-containing toothpastes on remineralization of white spot lesions (WSLs) by using Quantitative light-induced fluorescence (QLF-D) BiluminatorTM 2. Methods: Forty-eight premolars, extracted for orthodontic reasons from 12 patients, with artificially induced WSLs were randomly and equally assigned to four treatment groups: fluoride (1,000 ppm), CPP-ACP, fTCP (with sodium fluoride), and control (deionized water) groups. Specimens were treated twice daily for 2 weeks and stored in saliva solution (1:1 mixture of artificial and human stimulated saliva) otherwise. QLF-D BiluminatorTM 2 was used to measure changes in fluorescence, indicating alterations in the mineral contents of the WSLs, immediately before and after the 2 weeks of treatment. Results: Fluorescence greatly increased in the fTCP and CPP-ACP groups compared with the fluoride and control groups, which did not show significant differences. Conclusions: fTCP- and CPP-ACP-containing toothpastes seem to be more effective in reducing WSLs than 1,000-ppm fluoride-containing toothpastes.

Homodiamine-functionalized metal–organic frameworks with a MOF-74-type extended structure for superior selectivity of CO₂ over N₂

Yeon, Je Seon,Lee, Woo Ram,Kim, Nam Woo,Jo, Hyuna,Lee, Hanyeong,Song, Jeong Hwa,Lim, Kwang Soo,Kang, Dong Won,Seo, Jeong Gil,Moon, Dohyun,Wiers, Brian,Hong, Chang Seop The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.37

<▼1><P>The functionalized MOFs exhibit exceptional CO2/N2 adsorption capacity and selectivity, associated with the basicity of the introduced amine groups.</P></▼1><▼2><P>A porous Mg2(dondc) framework (H4dondc = 1,5-dioxido-2,6-naphthalenedicarboxylic acid) with open metal sites was prepared and functionalized with primary or secondary diamines (en = ethylenediamine, mmen = <I>N</I>,<I>N</I>′-dimethylethylenediamine, or ppz = piperazine). The CO2 adsorption was substantial under post-combustion flue gas conditions as compared to other reported metal–organic frameworks. Interestingly, the IR spectroscopic measurements demonstrated that the CO2 adsorption mechanism is based on the combination of physisorption and chemisorption. The CO2 adsorption capacity of 1-mmen was greater than that of 1-en and 1-ppz, which can likely be attributed to the basicity of the free amine groups tethered to the open coordination sites. Ultrahigh selectivity and superior dynamic separation of CO2 over N2 were evident in 1-ppz. Such exceptional CO2 uptake and CO2/N2 selectivity of diamine-functionalized materials hold potential promise for post-combustion CO2 capture applications.</P></▼2>

Preparation and electrical properties of CuInSe₂ thin films by pulsed laser deposition using excess Se targets

Yeon, Deuk Ho,Mohanty, Bhaskar Chandra,Jo, Yeon Hwa,Cho, Yong Soo Cambridge University Press (Materials Research Soc 2010 Journal of materials research Vol.25 No.10

<P>An effective way to prepare a robust CuInSe2 (CIS) target for subsequent vapor depositions of thin films is suggested in this work. The technique involves addition of excess Se to presynthesized CIS powder followed by cold pressing and sintering at a temperature as low as 300 °C. Phase-pure chalcopyrite CIS films were prepared at a substrate temperature of 300 °C from targets that contained different amounts of excess Se. The average size of particulates, typical of the pulsed laser deposition process, and their surface coverage decreased with increasing Se content up to 50 wt% in the targets. Films grown from the target with 50 wt% excess Se exhibited a hole concentration of ˜3 × 10<SUP>19</SUP> cm<SUP>−3</SUP> and a Hall mobility of ˜2 cm<SUP>2</SUP>/Vs. With the decrease of substrate temperature to room temperature, the resistivity increased from 1.1 × 10<SUP>−1</SUP> to ˜7.5 × 10<SUP>8</SUP> Ω·cm, which is attributed to the potential contributions of Se interstitials, CuIn, and <I>V</I>In defects.</P>

Biodiesel production from the black soldier fly larvae grown on food waste and its fuel property characterization as a potential transportation fuel

Jo-Yong Park,Sungyup Jung,Yong-Gyu Na,Cheol-Hwan Jeon,Hwa-Yeon Cheon,Eun-Young Yun,Sang-hoon Lee,Eilhann E. Kwon,Jae-Kon Kim 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.3

Insects have a great potential to be used as feedstocks for biodiesel production due to their intrinsic high lipid contents. In particular, biodiesel production from black soldier fly larvae (BSFL) is promising because of its advantages in engineering aspects such as a rapid proliferation, more lipid storage due to long-development time in larva stage, self-separation from organic waste. In this study, biodiesel was synthesized through (trans)esterification of BSFL grown on food waste to achieve both biofuel production from organic waste materials. In addition, all fuel properties of the biodiesel were examined to evaluate its feasibility as a potential transportation fuel in Korea. The highest yield of biodiesel obtained in this study was 86.51%. All the parameters of biodiesel produced from BSFL satisfied the Korea fuel standard (KS M 2965) except oxidation stability. The quality criterion of oxidation stability met the fuel standard with an addition of small quantity of tert-butylhydroquinone.