Agriculture in Korea 2020

Park Daeshik,Kim Meebok,Lee Myoungki,Kim Soosuk,Rhew Chanhee,Park Joonkee,Park Seongjae,Hwang Euisik,Kim Jongin,Kim Taehun,Jeong Minkook,Park Kihwan,Min Kyungtaek,Kim Byungryul,Choi Jihyeon,Park Misun 한국농촌경제연구원 2020 한국농촌경제연구원 기타연구보고서 Vol.- No.-

The effects of Mo doping on 0.3Li[Li_0.33Mn_0.67]O₂·0.7Li[Ni_0.5Co_0.2Mn_0.3]O₂ cathode material

Park, Jin-Hwan,Lim, Jinsub,Yoon, Jaegu,Park, Kyu-Sung,Gim, Jihyeon,Song, Jinju,Park, Hyosun,Im, Dongmin,Park, Minsik,Ahn, Docheon,Paik, Younkee,Kim, Jaekook The Royal Society of Chemistry 2012 Dalton Transactions Vol.41 No.10

<P>Mo doped Li excess transition metal oxides formulated as 0.3Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB>·0.7Li[Ni<SUB>0.5-<I>x</I></SUB>Co<SUB>0.2</SUB>Mn<SUB>0.3-<I>x</I></SUB>Mo<SUB>2<I>x</I></SUB>]O<SUB>2</SUB> were synthesized using the co-precipitation process. The effects of the substitution of Ni and Mn with Mo were investigated for the density of the states, the structure, cycling stability, rate performance and thermal stability by tools such as first principle calculations, synchrotron X-ray diffraction, field-emission SEM, solid state <SUP>7</SUP>Li MAS nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), elemental mapping by scanning TEM (STEM), inductively coupled plasma atomic emission spectrometry (ICP-AES) and a differential scanning calorimeter (DSC). It was confirmed that high valence Mo<SUP>6+</SUP> doping of the Li-excess manganese-nickel-cobalt layered oxide in the transition metal enhanced the structural stability and electrochemical performance. This increase was due to strong Mo–O hybridization inducing weak Ni–O hybridization, which may reduce O<SUB>2</SUB> evolution, and metallic behavior resulting in a diminishing cell resistance.</P> <P>Graphic Abstract</P><P>Mo doped Li excess transition metal oxides formulated as 0.3Li[Li<SUB>0.33</SUB>Mn<SUB>0.67</SUB>]O<SUB>2</SUB>·0.7Li[Ni<SUB>0.5-x</SUB>Co<SUB>0.2</SUB>Mn<SUB>0.3-x</SUB>Mo<SUB>2x</SUB>]O<SUB>2</SUB> were synthesized using the co-precipitation process. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2dt11833e'> </P>

My story of Jeju haenyeos

Park Jihyeon 한국구술사학회 2017 한국구술사학회 학술대회 Vol.2017 No.11

Key Anodization Factors for Determining the Formation of TiO₂ Microcones vs Nanotubes

Park, Jihyeon,Lee, Gibaek,Choi, Jinsub The Electrochemical Society 2017 Journal of the Electrochemical Society Vol.164 No.9

<P>In this study, the key anodization parameters of titanium for the formation of microcones were studied in detail. As the voltage increases, titanium oxides tend to transform from amorphous nanotubes to anatase microcones under certain electrolyte conditions. We found that a very small amount of H2SO4 is essential for the formation ofmicrocones. In addition, if the concentration of HF is too small, a barrier-type oxide is formed. In contrast, the surfaces of the formed nanotubes are quickly dissolved at high concentrations of HF. The formed microcones have an average diameter of 2.58 mu m and a height of 3.88 mu m. The formation mechanism of the TiO2 microcones is related to the changes in the molar volumes of titanium metal and its oxide. From the current-time transients, the current density is considerably higher during the formation of TiO2 microcones compared to the formation of other structures, indicating that a high current leads to extremely high local heating, resulting in the amorphous-to-anatase phase transformation. (C) 2017 The Electrochemical Society.</P>

The Efforts in the Globe and the Path towards Sustainable Future on Water-related Disaster Management

Jihyeon Park 한국방재학회 2015 한국방재학회 학술발표대회논문집 Vol.14 No.-

The record by natural disasters, in particular waterrelated hazards of the last decade is far from favorable. According to the Center for Research Epidemology of Disasters, for last 44 years, disasters caused by meteology, climate and water-related hazards caused 3.5million deaths. Since 1960, the cost of disasters in the world were more than 3.5 trillion dollars. Hurricane Katrina devastated New Orleans. The drought has killed an anonymous people in the Horn of Africa. Especially the region of Asia is concentrated 80% of global disasters and the floods and earthquakes have affected millions of people in Pakistan and China. These disasters remind us of the need for violence we have instruments such as the Hyogo Framework for Action (HFA), particularly because the disaster risk factors are numerous: climate change, environmental degradation, poor land use, nonexistent or poorly applied building codes, poverty, and even worse, poor governance by inappropriate and inadequate institutions. Of course there were some important success cases in the last decade. According to the National Report biannually submitted to the web platform “Preventionweb” by Hyogo Framework for Action 2005-2015, many countries have made their efforts for the objective of disaster risk reduction. For example, China has worked hard to stabilize its economic losses in its target range of 1.5% of GDP for last three years. In addition, Turkey will implement its anti-seismic prevention in all schools and hospitals in the country by 2017. Ethiopia has developed a sophisticated data management system to help guide its efforts to tackle not only to drought but also to other natural hazards. These countries as well as many others have included the study of disaster risk in their policy agenda. In Latin America, a cost-benefit analysis in Ecuador found that every dollar invested in reducing disaster risk, eliminating recurring losses from floods and storms, saves ultimately as equivalent as $ 9.50. Similarly, the EU believes that € 1 on the protection against floods earn €6. In the UK, investment in defenses against flooding means that 800,000 properties were protected during storms last winter. In March, the UN member states will meet for the Third World Conference on Disaster Reduction in Sendai, the center of the Tohoku region, which has suffered most from the earthquake and the 2011 tsunami that led to the Fukushima nuclear crisis. All of us as stakeholders in the field of disaster risk reduction have the same question in mind. The world has been up to the ambitious objectives of the HFA? The Leaders of the world must intensify their efforts in the fight against the risks posed by climate change, sea level rise, rapid urbanization and the rapid growth of population. With a strong political commitment at the highest level can enable real progress towards safer, more sustainable future. Also there needs to establish an integrated platform and information system for disaster risk to make policy-makers, economic leaders and all the public understand why disaster risk reduction is important, how we can react about those unexpected risks through early warning system and regular training for prevention and preparedness, what kind of measures are developed for risk assessment, how the scientific information is utilized for risk management.

Formation of well dispersed TiO₂ microcones; the 20% surface occupation

Park, Jihyeon,Choi, Jinsub Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.448 No.-

<P><B>Abstract</B></P> <P>We investigated the effects of applied potential and anodizing time on the morphological and structural changes of TiO<SUB>2</SUB> microcones for different electrolytes. We found that the mean diameter of the TiO<SUB>2</SUB> microcones produced in (COOH)<SUB>2</SUB> linearly increased with the applied voltage, whereas in other electrolytes, the mean diameters converged to a constant value. Regardless of the type of electrolyte used, the percentage of area occupied by the TiO<SUB>2</SUB> microcones is estimated at 20% of the entire surface when the microcones are fully-grown and well-dispersed. All the TiO<SUB>2</SUB> microcones are composed of the anatase phase, the intensity of which increases in the XRD spectra as the voltage or anodizing time increases. We identified the formation mechanism of the TiO<SUB>2</SUB> microcones using early stage current density-time transient graphs and SEM images.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Titanium foils are anodized in three types of electrolytes to produce well-grown and highly dense TiO<SUB>2</SUB> microcones. </LI> <LI> Anodization in (COOH)<SUB>2</SUB> leads to microcones with 20% areal density over the wide range of applied voltages. </LI> <LI> Well-dispersed and fully-grown TiO<SUB>2</SUB> microcones occupy approximately 20% of the total surface area. </LI> <LI> The prepared microcones consist of the anatase phase with similar Ti-O binding energies. </LI> </UL> </P>

Lower-leg cooling during halftime does not affect second-half performance in a football match

( Jihyeon Park ),( Daeho Kim ),( Jihong Park ) 국민체육진흥공단 한국스포츠정책과학원 2019 International Journal of Applied Sports Sciences Vol.31 No.1

Background: Cold application (e.g., lower-leg cooling: LLC) during halftime is becoming more popular in football matches. Therefore, we examined the effects of a 5-min halftime LLC (7.5 ± 1.0 ℃; bare feet immersed up to the tibial tuberosity), as a recovery strategy on subsequent performance changes in the second-half.Methods: Twenty male elite football players (age: 19 ± 1 years; height: 176 ± 6 cm; mass: 69 ± 7 kg; athletic career: 9 ± 1 years) participated in this crossover study (LLC or passive recovery: sitting on a bench without cooling). The 5-min FSP with a fixed intensity and distance, consisted of football-related activities (two trials of sprinting, jumping, dribbling, and kicking in various intensities and distances) and was repeated nine times (total 45-min) to mimic the first- and second-half of a football match. Calorie expenditure, heart rate, athletic performance, and passing accuracy were recorded. To determine feasibility, we compared our data to the normative values in previous reports. To test the condition effects over time, we performed a 2 × 6 mixed model analysis of variance for calorie expenditure and heart rate. For athletic performance and passing accuracy, we performed a 2 × 6 mixed model analysis of covariance (covariate: baseline measurement).Results: There were no statistical differences between the LLC condition and passive recovery on athletic performance and passing accuracy at any time point (p > 0.13 for all statistical tests). Recorded calorie expenditure (1,227 ± 142 kcal) and heart rate (163 ± 11 bpm) during our FSP were within the normative values of a typical football match (calorie expenditure: 1,200 to 1,500 kcal; heart rate: 150 and 175 bpm).Conclusions: Since a 5-min halftime LLC (at 7.5 ℃) immersed up to the tibial tuberosity are not effective in delaying fatigue and passing accuracy, it is not recommended for a recovery strategy. Since simulated football matches using the FSP were similar to a typical football match in terms of calorie expenditure and heart rate, it could be used for future research or training purposes.

Anti-Inflammatory Effect of Red Ginseng Marc, Artemisia scoparia, Paeonia japonica and Angelica gigas Extract Mixture (RAPA) in LPS-Stimulated RAW 264.7 cells

Jihyeon Park,Eunseo Kang,Jaeyoung Shin,Byoungok Cho,Feng Wang,Suping Hao,Dajeong Shin,Seonil Jang 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10

A normal inflammatory response is essential to protect the body from foreign substances. However, excessive inflammation contributes to diseases such as oxidative stress, heart disease and cancer. In this study, we investigated the anti-inflammatory effects of red ginseng marc, Artemisia scoparia, Paeonia japonica, and Angelica gigas (RAPA) extract mixture in LPS-stimulated RAW 264.7 cell. As a result, RAPA suppressed the expression of inflammatory factors such as iNOS and COX-2 and decreased the production of nitric oxide. In addition, RAPA decreased the expression of inflammatory cytokines TNF-α and IL-6. Furthermore, RAPA inhibited the phosphorylation of MAPKs and NF-κB. In conclusion, RAPA inhibited nitric oxide production by inhibiting iNOS expression and inhibited inflammatory cytokine production by down-regulating MAPK and Nf-κB signaling pathways in LPS-Stimulated RAW 264.7 cells. The results of this study suggest that RAPA can be used as a material to control excessive inflammatory responses.

헤드폰 기반의 공간감반영 입체음향 생성에서의 음상정위 오차

정지현(Jihyeon Jeong),박영진(Youngjin Park),박윤식(Youn-sik Park) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.10

Individual-level Cultural Values and Norms at Workplace - Comparison between Korea and China -

Jeon, Jihyeon,Park, Kyung Ok 한국인적자원관리학회 2015 인적자원관리연구 Vol.22 No.5

유교 문화의 영향으로 한국과 중국은 다소 상이한 점도 있으나 비교적 유사한 사회적 규범과 문화를 공유하고 있다. 최근 두 나라의 도약적인 경제 발전과 다문화 사회로의 변화로 조직구성원의 가치나 규범 체제에도 문화적 변화를 겪고 있음에도 불구하고 두 문화 간 비교연구가 활발히 진행되고 있지 않은 실정 이다. 이에 본 연구는 복합적 문화 가치의 변화가 조직구성원의 태도와 행동에 미치는 영향을 조사함으로 써 이질성과 갈등을 초래할 수 있는 조직 문화적 이슈를 이해하고 심도 있는 한국과 중국의 비교연구를 위한 기초연구를 제공함에 그 목적이 있다. 조직구성원의 집단주의(collectivism), 권력거리(power distance), 불확실성 회피(uncertainty avoidance)와 같은 Hofstede 문화지수와 전통적 규범(tradtitionality)과 같은사회 규범을 이용하여, 조직구성원간의 관계성(LMX), 그들의 태도(정서적 몰입, 지속적 몰입)와 행동(직 무성과와 조직시민행동)에 미치는 문화적 가치와 규범의 영향력에 대해 조사하였다. 검증을 위해 417부(한국 211부, 중국 206부)의 설문을 수집하였다. 분석 결과에 따르면, 불확실성 회피 와 전통적 규범은 정서적 조직몰입과 LMX에 정적 영향을 주었는데 이는 중국에 비해 한국 근로자에게 더 큰 의미있는 영향력이 있었다. 반면 권력거리와 지속적 조직몰입은 양국에서 강한 상관관계를 보이며 한국과 중국 근로자 모두에게서 정적 영향관계가 있음을 확인하였다. 불확실성을 회피하고자 하는 양국 근로자의 성향은 그들의 직무성과에 정적 영향을 주고 있었으며, 집단주의 성향은 중국 근로자들의 직무 성과에는 부적 영향을 주고 있음을 확인하였다. 반면 권력거리에 대한 수용 성향은 한국 근로자의 직무성 과에 부적 영향을 주고 있었다. 마지막으로 양국 근로자의 조직시민행동은 불확실성 회피 성향에 의해 정적 영향을 받고 있음을 확인하였다. 연구결과를 바탕으로 시사점과 연구의 한계점 및 향후 연구방향이 논의 되었다.