Aging IQ Intervention with Older Korean Americans: A Comparison of Internet-Based and In-Class Education

Yuri Jang,Hyunwoo Yoon,C. Nathan Marti,Miyong T. Kim 한국노인복지학회 2017 한국노인복지학회 학술발표논문집 Vol.7 No.1

Selective Electrochemical Depolymerization of Lignin in Lignocellulosic Biomass with Polyoxometalate Catalyst

Yuri CHOI,Rashmi MEHROTRA,Sang-Hak LEE,Inhui LEE,Jiyeong KIM,Yong-Hwan KIM,Sung-Yeon JANG,Ji-Wook JANG,Jungki RYU 한국생물공학회 2022 한국생물공학회 학술대회 Vol.2022 No.4

실험실 가스 누출 시 피해 영향 분석

장유리(Yuri Jang),정승호(Seungho Jung),박교식(Kyoshik Park) 한국가스학회 2015 한국가스학회지 Vol.19 No.4

화학물질을 다루는 실험실의 안전사고는 매년 끊이지 않고 있다. 특히 대학 내 실험실은 학생들이 주된 연구자로써 지식과 능력을 쌓아가고 경험을 축적하는 곳이기에 실험실의 안전은 더욱 중요하다. 학 내 실험실에서 주로 사용하는 5가지의 가스(CO, NH₃, H₂, CH₄, N₂)를 선정하여 이 가스들이 누출 될 경우의 시나리오들로부터 확산 과정을 PHAST v.6.7로 계산, 분석함으로써 피해 정도를 예측하였다. 실험실 내부 확산과정은 Computational Fluid Dynamics(CFD) 프로그램 FLUENT를 통하여 모델링하였다. 가스 누출 시 실험실 창을 통해 외부로 유출 될 경우 실내와 실외의 피해 영향에 대해서도 비교하였다. 각 가스들의 모델링 결과를 보면, 실험실 외부보다는 실험실 내부에서 그 피해 정도가 훨씬 큰 데, 학 내 실험실에서 일반적으로 사용하는 가스 용기, 즉 실린더의 용량은 47 L(혹은 그 이하)로 ton 단위로 사용하는 사업장에 비하면 그 양이 현저히 적기 때문에 실외의 영향이 플랜트와 비교해서 현저히 작다. 하지만 시뮬레이션 결과 작은 양으로도 실내에서는 큰 피해가 발생할 수 있음을 보여준다. Accidents in laboratory dealing with chemicals have constantly occurred. In the case of a gas explosion or an accident related to leakage of chemical materials, the damage is much greater, thereby leading to a serious accident. Especially, the safety of laboratory in University is important because students build up knowledge and skills and accumulate experience as the main researchers. In this paper, 5 gases(CO, NH₃, H₂, CH₄, N₂) are selected to model since they are often used in university laboratories. From the scenarios where the gases are released, the diffusion process is estimated and analyzed to predict damage degree by PHAST v.6.7. Internal diffusion process is modeled through FLUENT which is Computational Fluid Dynamics(CFD) tool. Also, we compare indoor damage with outdoor one when discharged to the outside through the laboratory’s window. In the modeling results, the outdoor damages for accident scenarios in the results are far less than then of real plants since the vessel usually used in laboratory(i.e. the capacity of the cylinder; 47 L or less) is significantly less than workplace’s one(using ton measure). However as shown in the results small amount can have high consequences for indoor accidents.

지하 매설 공동구 내부 가스 폭발에 대한 위험성 평가

장유리(Yuri Jang),정승호(Seungho Jung) 한국가스학회 2016 한국가스학회지 Vol.20 No.5

가스 배관을 공동구 내에 수용하는 것은 단순 매설하는 것보다 부식의 위험이 적고, 외부인의 출입이나 굴착공사 등으로부터 오는 물리적 손상을 예방할 수 있다는 점에서 편의성이 크다. 그러나 밀폐된 공간이라는 특성상 개방된 공간에서의 폭발보다 폭발 과압에 의한 피해가 크다. 그럼에도 공동구에 대한 연구는 화재 사고에 국한되어 진행되었고, 폭발로 인한 위험성에 관한 연구가 부족한 실정이다. 본 연구는 지하 공동구 내부의 가스배관으로부터 누출된 메탄가스가 원인모를 점화원에 의해 폭발을 일으켰을 경우를 가정하여 피해결과 관점에서 공동구 내부의 폭발이 상부 시설물에 미치는 영향을 살펴보았다. 안전설비의 작동상태에 따른 2가지의 시나리오를 선정하여 CFD tool인 FLACS를 사용하여 영향성 평가를 진행한 결과 대부분의 건축물을 전파 시킬 수 있을 정도의 폭발 과압이 예측되었다. 이 결과를 활용하여서 사고 발생 빈도를 감소시켜 안전성을 확보할 수 있는 추가 대책을 제시하였다. Keeping the gas pipelines in the common utility tunnel is useful because it has a lower risk of corrosion than conventional burial, and can prevent from excavating construction. But, explosions in common utility tunnels can cause greater damage from the blast overpressure compared to outdoor explosions, due to nature of the confined environment. Despite this fact, however, research on common utility tunnels has been limited to fire hazard and little has been studied on the dangers of explosions. This study developed scenarios of methane gas explosion caused by gas leak from gas piping within the common utility tunnel followed by unknown ignition; the study then calculated the extent of the impact of the explosion on the facilities above, and suggested the needs for designing additional safety measures. Two scenarios were selected per operating condition of safety devices and the consequence analysis was carried out with FLACS, one of the CFD tools for explosion simulation. The overpressures for all scenarios are substantial enough to completely destroy most of the buildings. In addition, we have provided additional measures to secure safety especially reducing incident frequency.

노년기 자기 통제감에 영향을 주는 요인

장유리(Yuri Jang),이정남(Jeongnam Lee),윤현숙(Hyunsook Yoon),김수영(Soo-Young Kim) 한국노년학회 2008 한국노년학 Vol.28 No.4

자기 통제감은 노년기의 다양한 스트레스 상황에서 신체적ㆍ정신적 건강을 보호하고 증진시키는 역할을 한다고 밝혀져 왔다. 본 연구에서는 노년기 자기 통제감에 영향을 주는 요인을 분석하였다. 주요 영향 요인을 (1) 사회 인구학적 특성, (2) 신체 건강 상태, (3) 최근 일어난 부정적 생활사건, (4) 사회 관계적 자원으로 분류하였다. 국내 다섯 개 도시에 거주하는 60세 이상 노인 291명(평균 연령=69.9)을 연구 대상으로 하였고, 자기 통제감은 Pearlin과 Schooler(1978)의 Mastery Scale의 7항목으로 측정되었다. 위계적 회귀분석 결과, 경제 수준, 만성 질환, 일상생활 수행 장애, 시력, 부정적 생활사건 경험, 그리고 자녀와의 관계 만족도가 자기 통제감에 유의한 영향을 주는 요인으로 밝혀졌다. 이러한 결과를 통해, 노년기 자기 통제감 증진을 위한 개입이나 사회적 프로그램 개발의 중요성을 제시하였다. Given the central role of sense of control in physical and emotional well-being, the present study examined the determinants of sense of control among Korean elders. We considered sociodemographic characteristics (age, gender, marital status, education, and self-perceived economic status), health-related factors (chronic conditions, functional disability, and sensory impairment), stressful life events, and network-related resources (network of relatives, network of friends, and filial satisfaction) as potential predictors. Sense of control was measured with Pearlin and Schooler's (1978) Mastery Scale. Hierarchical regression analyses with 291 Korean elders aged 60 or older (M age=69.9) identified lower self-perceived economic status, more chronic conditions, greater functional disability, greater vision impairment, more stressful life events, and lower filial satisfaction as significant risk factors for a diminished sense of control. Because most of the identified risks represent normative experiences during later life, the results underscored the importance of preserving or promoting sense of control for older adults. Implications of the findings and recommendations for future studies are discussed.

탐색 자극의 시각적 특징이 공간적 배열의 맥락 단서 학습에 미치는 영향

장유리(Yuri Jang),정고은(Koeun Jung),민윤기(Yoonki Min) 한국자료분석학회 2020 Journal of the Korean Data Analysis Society Vol.22 No.4

방해 자극들 사이에 표적 자극이 제시되는 시각 장면에 반복적으로 노출될 때, 우리는 표적의 위치와 방해 자극의 공간적 배열 사이의 연합을 학습할 수 있다. 따라서 표적을 탐색하는 속도는 새로운 화면보다 반복 화면에서 더 빠르며, 이러한 탐색 시간의 이득을 맥락 단서 효과(Contextual cueing effect)라고 한다. TL 탐색 과제를 사용한 맥락 단서 효과는 주로 자극들의 공간적 배열로 정의되어 왔으나, 실제 물체 탐색 과제를 사용한 최근 연구들에서는 맥락이 자극들의 공간적 배열과 시각적 특징의 합으로 정의된다고 제안하고 있다. 본 연구에서는 공간적 배열맥락이 시각적 특징 맥락보다 더 강할 때, 시각적 특징 맥락이 공간적 배열 맥락 단서의 학습에 어떤 영향을 미치는지 알아보고자 하였다. 연구 1(물체 탐색)과 연구 2(TL 탐색)는 공간적 배열의 독립적 학습과 이에 시각적 특징 맥락이 더해지는 효과를 보여주었다. 그러나 맥락 단서의 학습은 두 과제에서 다르게 나타나지 않았다. 따라서 과제에 따라 맥락 단서의 학습이 다르게 나타나는 것이 아니라 표적의 위치를 예측해주고 연합장벽(associative blocking)이 발생하지 않을 때 맥락 단서에 대한 학습이 발생한다는 것을 확인하였다. When visual displays in which a target is presented among distractors are repeatedly presented, we able to learn the association between the spatial configuration of distractors and target’s location. Search speed is faster in the repeated displays than in the novel displays. This benefit of search time is called the Contextual cueing effect. The contextual cueing effect using the TL search task has been defined primarily as a spatial configuration of stimuli, but the recent studies by Makovski(2016, 2018), using the real-world object search task, suggest that the context is the sum of the spatial configuration and visual features of stimuli. Therefore, the goal of this study was to investigate how the context of visual features affects the learning of context of spatial configuration when the context of spatial configuration is stronger than the context of visual features. Study 1(using the real-world search task) and Study 2(using the TL search task) showed the independent learning of spatial configuration and the additive effect of the context of visual features. Also, the learning of contextual cue did not differ between the two tasks. These results suggest that the learning of contextual cue not depends on task, but it is possible when the contextual cues can predict the target location and associative blocking does not occur.

맥락 단서 효과를 활용한 PIN 인증 시스템 제안

장유리(Yuri Jang),민윤기(Yoonki Min) 한국HCI학회 2019 한국HCI학회 학술대회 Vol.2019 No.2

PIN(Personal Identification Number)은 과거부터 금융거래에서 개인을 인증하는 방법으로 많이 사용되어 왔으며, 아직까지 사용자에게 가장 익숙한 인증 방식이다. 그러나 PIN 인증 방식은 모바일 특성상 훔쳐보기(Shoulder-surfing)에 취약하며, PIN 번호만 알고 있다면 누구든지 접근이 가능하다는 단점이 있다. 따라서 본 연구는 맥락 단서효과(contextual cueing effect)를 활용하여 비사용자의 접근이 불가능한 새로운 PIN 인증시스템의 실현 가능성에 대해 알아보고자 하였다.

Removal of Nonylphenol from Industrial Sludge by Using an Electron Beam

Jang-Seung Choi,Jun-Hyun Park,Yuri Kim,JinKyu Kim,SeungTae Jung,Bumsoo Han,Turki S. Alkhuraiji 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.6

Endocrine disrupting chemicals (EDCs) and potential EDCs are mostly man-made, found in various materials such as pesticides, additives or contaminants in food, and personal care products. EDCs have been suspected to be associated with altered reproductive function in males and females increased incidence of breast cancer, abnormal growth patterns and neuro-developmental delays in children and changes in immune function. A number of processes were investigated regarding their potential for removing of endocrine disrupters. Those processes are ferric chloride coagulation, powdered activated carbon, magnetic ion exchange combined with microfiltration or ultrafiltration, as well as nanofiltration, and reverse osmosis. They show some good removal of EDCs in aqueous solution, but do not show good efficiency when EDCs are in sludge. High energy ionizing radiation has the ability to remove the EDCs with a very high degree of reliability and in a clean and efficient manner. The ionizing radiation interacts with EDCs both directly and indirectly. Direct interaction takes place with EDCs, and the structure of EDCs is destroyed or changed. During indirect interaction, radiolysis products of water result in the formation of highly reactive intermediates which then react with the target molecules, culminating in structural changes. For confirmation of radiation reduction of EDCs in industrial sludge, a pilot scale experiment up to 50 kGy of electron beam was conducted with samples from the textile dyeing industries. The experimental result showed over a 90% reduction of nonylphenol (NP) at absorbed doses of around 10 kGy.

HBV : O-005 ; Is an adefovir plus entecavir combination therapy superior to adefovir plus lamivudine combination therapy in patients with chronic hepatitis B resistant to both lamivudine and adefovir?

( Yuri Cho ),( Dong Hyeon Lee ),( Kwang Hyun Chung ),( Jeong Hoon Lee ),( Eun Ju Cho ),( Eun Sun Jang ),( Min Sun Kwak ),( Su Jong Yu ),( Jin Wook Kim ),( Sook Hyang Jeong ),( Jung Hwan Yoon ),( Hyo S 대한간학회 2012 춘·추계 학술대회 (KASL) Vol.2012 No.-

Background: The efficacy of adefovir (ADV) plus entecavir (ETV) combination in patients with chronic hepatitis B (CHB) who developed multidrug resistance had not been fully evaluated. We aimed to evaluate the efficacy of ADV plus ETV as compared to that of LAM plus ADV in patients with antiviral resistance to both LAM and ADV. Methods: 27 patients were treated with a combination of ADV plus ETV and 63 patients were treated with a combination of LAM plus ADV. The virological and biochemical parameters were compared between the two groups. Results: Treatment with a combination of ADV plus ETV produced a significantly superior in virological response compared to that in the LAM plus ADV group during 12 months of therapy. At 12 months, the HBV DNA declined more in the ADV plus ETV than in the LAM plus ADV (-4.52 ± 1.956 vs. -2.65 ± 1.723 log10IU/mL; p = 0.001). The rate of a complete response at 12 months was greater in the ADV plus ETV than that in the LAM plus ADV (73.68% vs. 31.48%, p = 0.005). Conclusions: In patients with CHB resistant to both LAM and ADV, the response to ADV plus ETV was significantly superior compared to that of the LAM plus ADV for suppressing HBV DNA through 12 months. The result indicates that ADV plus ETV rather than LAM plus ADV might be used as a bridging therapy in patients with CHB resistant to both LAM and ADV, especially in areas where tenofovir is not available.

Age-Related Effects of Sodium Arsenite on Splenocyte Proliferation and Th1/Th2 Cytokine Production

Yuri Cho,김대경,Kyong Hoon Ahn,백문정,최종민,Jung Eun Ji,Jong Hoon Won,Zhicheng Fu,Ji Min Jang 대한약학회 2012 Archives of Pharmacal Research Vol.35 No.2

Aging is associated with immune dysfunction and conditions such as inflamm-aging and immunosuppression. Arsenic, an environmental contaminant distributed worldwide, affects the immune system. This study tested the hypothesis that arsenic has distinct effects on T cell proliferation and the production of cytokines by activated T cells. Murine splenocytes from young (2 months) and aged (24-26 months) C57BL/6 mice were exposed to arsenite (As3+), the most toxic form of inorganic arsenic, and stimulated with concanavalin A (Con A) or anti-CD3 antibody. T cell proliferation decreased significantly in response to Con A and anti-CD3 at subtoxic doses of arsenite in splenocytes from both young and aged mice. Arsenite, added concurrently with Con A or anti-CD3, significantly inhibited the production of interleukin-2 (IL-2), interferon-γ (IFN-γ), and interleukin-4 (IL-4) by splenocytes from young mice and significantly reduced the production of IL-10 by splenocytes from aged mice. In contrast, the production of IL-2 and IL-4 by splenocytes from aged mice was only slightly affected by arsenite. The results show that arsenic exposure reduces the immune response in splenocytes. Moreover,this effect may be influenced by aging.