MRP robots for improving communication quality, presence and life satisfaction for institutionalized elderly

Hyunah Park,Joonhwan Lee,Sangsuk Lee 한국HCI학회 2017 한국HCI학회 학술대회 Vol.2017 No.2

Mobile remote presence (MRP) robots allow physically remote people to interact and communicate as if they are in the same place. MRP function as embodied proxy agents. In this study, we tried to examine the effect of MRP robots on quality of communication and life satisfaction for institutionalized elderly people. They usually have a mild cognitive impairment, which decreases their ability to communicate with people and will to live lively. We assumed that communicating via MRP robots would improve their quality of communication and life satisfaction through the sense of presence and mobility. To test this assumption, we conducted two experiments-involving 1) three communication conditions (telephone, video call, and MRP) to examine quality of communication, and 2) six tasks to test the perception of a presence and life satisfaction. Our results showed that quality of communication was highest in the MRP condition for most of the participants. Also, interacting with the MRP significantly increased life satisfaction, although no significant effect was found on perceived presence.

An Norovirus Outbreak at a Local Festival in Chungnam Korea

Hyunah Lee,Donguk Kim,Seongmin Park,Jongjin Park,Hae-Sung Nam,Jinha Choi,박준혁 대한미생물학회 2019 Journal of Bacteriology and Virology Vol.49 No.2

Noroviruses (NoV) are the major viral pathogen causing epidemic acute gastroenteritis and outbreaks of foodborne and waterborne illness. During the local festival in Chungnam province, group food poisoning occurred outbreak by NoV infections in Jan 2019. In this study, epidemiological analysis and molecular characterization were conducted such as genotyping, phylogeny. The prevalent genotypes of food poisoning events were NoV GII.3 and GII.17, and NoV GII.3 and GII.17 isolates of this study were completely matched in nucleotide sequence comparison of capsid gene region, respectively. In underground water and stream water, various multiple genotypes of noroviruses were detected including NoV GII.3, GII.8 and GI.4 in aquatic environment of the local festival site. Among 32 worker samples, various NoVs of five genotypes (GI.7, GI.8, GII.3, GII.8, GII.17) were detected in 12 samples and expected to causing NoV contaminated by exposure to groundwater. NoV genotype GII.3, which was detected from groundwater 2, was completely consistent with that of patients and workers. Therefore, groundwater within the local festival site could be main cause of food poisoning event. Because NoV outbreaks are caused by fecal to oral transmission, proper management of sewage purification facilities, groundwater and sanitary toilets is required for many visitors, and efforts are needed to maintain clean environment.

Effects of Hydrogen Plasma Treatment of the Underlying TaSiN Film Surface on the Copper Nucleation in Copper MOCVD

Hyunah Park,임종민,이종무 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.6

MOCVD is one of the major deposition techniques for Cu thin films and Ta-Si-N is one of promising barrier metal candidates for Cu with high thermal stability. Effects of hydrogen plasma pretreatment of the underlying Ta-Si-N film surface on the Cu nucleation in Cu MOCVD were investigated using scanning electron microscopy, X-ray photoelectron spectroscopy and Auger electron emission spectrometry analyses. Cu nucleation in MOCVD is enhanced as the rf-power and the plasma exposure time are increased in the hydrogen plasma pretreatment. The optimal plasma treatment process condition is the rf-power of 40W and the plasma exposure time of 2 min. The hydrogen gas flow rate in the hydrogen plasma pretreatment process does not affect Cu nucleation much. The mechanism through which Cu nucleation is enhanced by the hydrogen plasma pretreatment of the Ta-Si-N film surface is that the nitrogen and oxygen atoms at the Ta-Si-N film surface are effectively removed by the plasma treatment. Consequently the chemical composition was changed from Ta-Si-N(O) into Ta-Si at the Ta-Si-N film surface, which is favorable for Cu nucleation

A New Water Oxidation Catalyst: Lithium Manganese Pyrophosphate with Tunable Mn Valency

Park, Jimin,Kim, Hyunah,Jin, Kyoungsuk,Lee, Byung Ju,Park, Yong-Sun,Kim, Hyungsub,Park, Inchul,Yang, Ki Dong,Jeong, Hui-Yun,Kim, Jongsoon,Hong, Koo Tak,Jang, Ho Won,Kang, Kisuk,Nam, Ki Tae American Chemical Society 2014 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.136 No.11

<P>The development of a water oxidation catalyst has been a demanding challenge for the realization of overall water-splitting systems. Although intensive studies have explored the role of Mn element in water oxidation catalysis, it has been difficult to understand whether the catalytic capability originates mainly from either the Mn arrangement or the Mn valency. In this study, to decouple these two factors and to investigate the role of Mn valency on catalysis, we selected a new pyrophosphate-based Mn compound (Li<SUB>2</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB>), which has not been utilized for water oxidation catalysis to date, as a model system. Due to the monophasic behavior of Li<SUB>2</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> with delithiation, the Mn valency of Li<SUB>2-<I>x</I></SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> (<I>x</I> = 0.3, 0.5, 1) can be controlled with negligible change in the crystal framework (e.g., volume change ∼1%). Moreover, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, ex-situ X-ray absorption near-edge structure, galvanostatic charging–discharging, and cyclic voltammetry analysis indicate that Li<SUB>2-<I>x</I></SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> (<I>x</I> = 0.3, 0.5, 1) exhibits high catalytic stability without additional delithiation or phase transformation. Notably, we observed that, as the averaged oxidation state of Mn in Li<SUB>2-<I>x</I></SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> increases from 2 to 3, the catalytic performance is enhanced in the series Li<SUB>2</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> < Li<SUB>1.7</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> < Li<SUB>1.5</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> < LiMnP<SUB>2</SUB>O<SUB>7</SUB>. Moreover, Li<SUB>2</SUB>MnP<SUB>2</SUB>O<SUB>7</SUB> itself exhibits superior catalytic performance compared with MnO or MnO<SUB>2</SUB>. Our study provides valuable guidelines for developing an efficient Mn-based catalyst under neutral conditions with controlled Mn valency and atomic arrangement.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2014/jacsat.2014.136.issue-11/ja410223j/production/images/medium/ja-2013-10223j_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja410223j'>ACS Electronic Supporting Info</A></P>

Investigating the Relative Significance of L2 Vocabulary and Grammatical Knowledge in L2 Reading Comprehension

Hyunah Park 한국외국어교육학회 2014 Foreign languages education Vol.21 No.2

This study attempted to investigate the relative contribution of vocabulary and grammatical knowledge to second language reading comprehension ability. With 44 EFL adult learners whose language proficiency fell within the low-intermediate level, three different measures were conducted: vocabulary and grammatical knowledge were measured by researcher-developed tests and L2 reading comprehension was measured using the reading section of the TOEIC test. In order to examine the two predicting variables (i.e., vocabulary and grammatical knowledge) a multiple regression analysis was performed. The study found that both grammatical and vocabulary knowledge related significantly to L2 reading comprehension. Additionally, vocabulary knowledge showed a slightly stronger contribution to reading comprehension than syntactic knowledge. These findings suggest that it is equally important for lower level readers to understand vocabulary as well as basic syntactic rules and structures when it comes to EFL reading comprehension.

Find the threshold: The importance of setting criteria of context and expectation levels for smart speakers

Hyunah Park,Moonyoung Tae,Youngjin Huh,Joonhwan Lee 한국HCI학회 2018 한국HCI학회 학술대회 Vol.2018 No.1

Smart speakers are expected to be widely used in users’ daily lives for relational purposes. We conducted semi-structured interviews with smart speaker users in order to explore the factors that can influence human-like conversations with smart speakers and expectations users have, which may lead to continuous use. From the interviews, we found that users apply a double standard to the speakers’ human-likeness and de-escalate their expectation for speakers according to expectancy violation. We also found that users want their speakers to have contextual awareness in various situations. Our results may contribute to setting the contextual awareness and expectation level of relational agents in future smart speaker design.

브이라디오 : 스마트 스피커 기반 스트리밍형 음성 SNS

박현아(Hyunah Park),손윤선(Yunseon Son),김용웅(Yongwoong Kim),이세웅(Sewoong Lee) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2

스마트 스피커의 보급률이 높아지고 오픈빌더 생태계가 조성됨에 따라 다양한 콘텐츠가 개발되고 있다. 그러나 지금까지 스마트 스피커에서는 주로 명령-제어 방식의 상호작용만이 이루어져 왔다. 본 연구에서는 음성인터페이스의 한계를 극복하기 위해 이용자의 자유발화 및 라디오의 스트리밍 형식을 도입한 스마트 스피커 기반 음성 소셜 네트워킹 서비스인 〈브이라디오〉를 제안한다. 〈브이라디오〉는 스마트 스피커 기반으로 이용자가 음성을 입력하고, 타인과 공유하고, 재생할 수 있는 스트리밍 방식 소셜 네트워크 서비스 어플리케이션이다. 본 연구는 기존의 스마트폰 기반의 SNS 를 음성 기반으로 전환하는 것에 대한 가능성을 탐색하였다는 의의를 갖는다.

융합적 스마트시대의 소셜 미디어 기반 e-포트폴리오 활용 방안

박현아(Park, Hyunah),현은령(Hyun, Eunryung) 한국디자인지식학회 2013 디자인지식저널 Vol.27 No.-

스마트기술이 발전함에 따라 그동안 전통적 교육환경에 놓여있던 학교현장도 많은 변화를 요구받고 있다. 우선, 학생스스로 흥미를 가지고 수준과 적성에 맞는 교육을 받을 수 있도록 교육내용 구성의 재조직화가 필요하게 되었다. 따라서 그동안 필답고사가 주가 되던 평가방법도 연계성 있는 지식구성과정과 동료학습자와의 상호작용을 통해 수행되는 교육내용을 효과적이고 체계적으로 평가할 수 있는 방법적 대안의 필요성이 대두되고 있다. 이러한 상황에서 e-포트폴리오는 빅 데이터(big data) 환경 속에서 풍부하고 다양한 학습의 자료를 정보기술을 통해 일련의 과정으로 기록할 수 있다는 장점이 있다. 이는 학습자의 성취도뿐만 아니라 진로지도 및 진학계획의 자료로서도 활용가능하다. 특히 소셜 미디어를 기반으로 하는 e-포트폴리오는 소통의 문제가 전면적인 미래사회 문제로 대두될 것이라는 현 시점에서 점차 개인화, 개성화 등으로 갈등이 고조되고 있는 학습자간 문제를 해결 할 수 있는 대안적 방법이 될 수 있다. 또한 소셜 미디어를 기반으로 하는 커뮤니케이션을 통해 창의성과 관용적 이해에 바탕을 둔 합리적인 소통능력의 함양으로 집단 지성(collective intelligence)의 힘을 발휘할 수 있을 것이다. 따라서 본 논문은 융합적 스마트 사회로 전환되고 있는 현 시대의 학교현장의 변화를 살펴보고 그 변화 속에서 학습자의 고차원적 사고에 가치를 두도록 유도할 수 있는 e-포트폴리오의 개념과 효과를 소셜 미디어를 기반으로 살펴보았다. 나아가 학교 현장에서 활용 가능한 구성요소 및 제작아이디어를 제공함으로써 ‘학습자의 수준’을 평가하는 것을 넘어서 ‘학습자의 삶의 의미’를 탐색하는데 도움을 주는 평가 도구개발에 아이디어를 제공하고자 한다. According to develop Smart Technology, the school education field within traditionally educational environment is required to change. First of all, it is necessary to reorganize contents construction, which provides the appropriate education to students from the perspective of the learners’ interests, aptitude and levels. Therefore, there is a growing need to develop effective and systematic evaluation method through constructing process of knowledge and interaction between colleague learners. e-portfolio in smart era with big data has benefits in the perspective of recording the series of process with rich a variety of learning materials, which is possible to apply to career guidance and entrance planning into a school of higher grade. Also, the communication of social media will transfer creativity, rational communication ability, and the power of collective intelligence to learners. I within this research closely observed the school change in the present and e-portfolio’s notion and effect, based on social media, which induce learners to think important the value of higher thoughts. Also, by providing e-portfolio’s components and ideas, based on social media, which are possible to apply school environment, this research has to give a helping to develop assessment tool, which might help learners to look at ‘learners’ meaning of life’ over ‘learners’ levels’.

보블: 웹 기반TTS 오디오콘텐츠 저작 도구

박현아(Hyunah Park) 한국HCI학회 2021 한국HCI학회 학술대회 Vol.2021 No.1

비대면 트렌드가 지속되고 멀티태스킹을 하는 사람들이 늘어나면서 오디오 콘텐츠의 인기가 높아지고 있다. 그러나 지금까지 오디오 콘텐츠를 제작하는데는 성우 섭외와 녹음 및 편집의 비용 및 시간 부담이 높다는 문제점이 있었다. 본 연구에서는 오디오 콘텐츠의 성우 섭외와 녹음 편집의 문제를 극복하기 위해 사용자가 텍스트와 나레이션을 자동 분리하고 text-to-speech(TTS) 기술과 음향을 드래그앤드롭(drag-and-drop)할 수 있는 저작툴인 〈보블(Vovel)〉을 제안한다. 〈보블〉은 웹 기반으로 사용자가 텍스트를 입력하고 원하는 목소리와 음향효과를 추가하여 손쉽게 오디오콘텐츠를 저작할 수 있는 툴이다. 본 연구는 텍스트 기반의 오디오콘텐츠를 쉽게 저작할 수 있는 가능성을 탐색하였다는 의의를 갖는다.

마커를 이용한 관절 연체 모델 변형의 IK 계산 가속화

박현아(Hyunah Park),강다은(Daeun Kang),권태수(Taesoo Kwon) 한국컴퓨터그래픽스학회 2021 한국컴퓨터그래픽스학회 학술대회 Vol.2021 No.7

본 논문은 골격이 있으나 몸체의 변형이 비교적 자유로운 캐릭터 모델의 변형을 빠른 계산 속도로 구현하기 위해 가속화된 역기구학 풀이 방법을 제안한다. 기존의 풀이 방법은 ① 각 마커에 대하여, ② 해당 마커의 위치에 영향을 미치는 각 뼈대에 대하여, ③ 해당 뼈대에 영향을 미치는 상위(부모) 관절에 대하여 계산을 수행하는 삼중 중첩 반복 계산 구조를 갖는다. 그러나 해당 계산 과정에 중복되는 과정이 많은 것을 고려하여 사전에 계산된 값을 이용하는 방식을 통해 변형을 수행하는 데 필요한 계산 시간을 감소시켰다. 이러한 방식은 선형 블랜드 스키닝 기법으로 구성된 캐릭터 모델을 다루거나, 마커 없이 단순 촬영만으로 수행하는 모션 캡처 관련 연구에도 유용하게 활용할 수 있다.