Measuring Psychological Support for the Unemployed: The Case of Kakao NEET Project

( Jaekwan Jeong ),( Kahui Park ),( Yaewon Hyun ),( Daewon Kim ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.4

This paper attempts to investigate Korean youth Not in Education, Employment and Training (NEET) and how daily activities and community participation may influence their positive emotions and job search desire. First, we conducted a focus group interview with 16 NEETs who participated in the Kakao NEET Company project. The project allowed participants to experience employment by founding a virtual company in which each participant selected a daily activity to perform as part of the company’s operations. Second, the interview responses were categorized and assigned emotional values using the card sorting technique and multi-dimensional analysis (MDS). A total of 11 emotional values were derived through this process. Finally, a social network analysis was conducted in order to measure the density of relations among the emotional values. Results suggest that immersion, confidence, belongingness were the three highest values evaluated by participants. Furthermore, network diagrams imply that the stronger participants perceived social support and belongingness with others, the stronger their responsibility grew, further leading them to establish steady goals. In particular, the high eigenvector score for “desire for job” suggests that emotional values are sequentially connected to the immersion-social support-responsibility-goal-job desire. This sequence suggests that digital services that are developed with the aim to enhance social values such as the Kakao NEET Project may engender motivation and confidence in youth NEETs. The overall results suggest that a systematic approach to policymaking should be considered in order to provide fundamental solutions and expand opportunities for social participation and emotional comfort, as social isolation due to low self-esteem has been reported as one of the reasons for NEETs’ failure in the labor market.

CMOS-compatible Si metasurface at visible wavelengths prepared by low-temperature green laser annealing

Lee, Jeong Yub,Kim, Yongsung,Han, Seunghoon,Kim, Jaekwan,Yoon, Jae Woong,Lee, Ki Young,Song, Seok Ho,Yang, Kiyeon,Lee, Chang Seung IOP 2019 Nanotechnology Vol.30 No.4

<P>A low-temperature laser crystallization is newly devised for producing polycrystalline silicon (poly-Si) thin films of low-loss, low surface roughness enough for nanoscale patterning, applicable to practical Si metasurface elements on complementary metal-oxide semiconductor (CMOS) electronic architectures in visible lights. The method is based on dielectric encapsulation of an amorphous Si film and subsequent laser-induced local crystallization. Such poly-Si thin film yields order-of-magnitude smaller surface roughness and grain size than those obtained with the conventional laser annealing processes. The mechanism of the formation of small and uniform crystalline grains during solidification is studied to ensure the smooth surfaces enough for nanoscale patterning. By obtaining root mean square of surface roughness <2.49 nm and extinction coefficient <4.8?×?10<SUP>–2</SUP> at 550 nm, visible metasurface color-filter elements are experimentally demonstrated with the resonant transmission-peak efficiency approaching ∼85%. This low-loss poly-Si metasurface is favorably compatible with embedded CMOS electronic architectures in contrast to the conventional thermal annealing processes that often cause failure of electrical device functionalities due to delamination and material-property degradation problems. The proposed fabrication in this study provides a practical method for further development of various Si metasurfaces in the visible domain and their integration with CMOS electronic devices as well.</P>

10주간 유산소와 저항성 운동의 다른 수행 순서에 따른 20대 남성의 신체조성, 신체기능과 호르몬에 미치는 영향

김대열(Daeyeol Kim),정재관(Jaekwan Jeong),조성채(Sungchae Cho),국두홍(Doohong Kuk),박혁(Hyeok Park),이하얀(Hayan Lee),홍고은(Goeun Hong),황연희(Yeonhee Hwang),김동희(Donghee Kim) 한국산학기술학회 2018 한국산학기술학회논문지 Vol.19 No.1

본 연구는 20대 남성을 대상으로 10주간 저항운동과 유산소 운동을 순서가 다르게 실시한 후 신체조성, 운동수행능력 및 호르몬의 변화에 어떠한 영향을 주었는지에 관한 연구이다. 실험 참가자들 (N=30)은 무선할당 방식으로 유산소 운동 후 저항 운동그룹 (n=10, A+R), 저항운동 후 유산소 운동그룹(n=10, R+A)과 통제그룹 (n=10, CON)으로 나누었다. 10주간 유산운동(최대심박수 50-80%, 30분)과 저항운동(50-80% 1RM, 30분)으로 순서를 달리하여 주3회 한 회당 총 70-80분으로 운동을 수행하였다. 훈련 기간 전과 10주후에 신체조성, 운동수행능력, 호르몬이 측정되었다. 연구 결과는 신체조성에서 A+R의 골격근량(p=.015)은 증가하였고 체지방량(p=.042), 체지방률(p=.007)은 감소하였다. R+A의 골격근량(p=.001)은 증가하였고, 체지방량(p=.003)은 감소하였다. CON은 체중(p=.03)과 체지방량(p=.039)이 증가하였다. 운동수행능력에서 A+R에 유산소능력(p=.011)과 저항성능력(p=.001)이 증가하였고, R+A는 저항성능력(p=.0016)이 증가하였다. 호르몬에서 A+R에 에피네프린(p=.048), 노르에피네프린(p=.013), 코티졸(p=.045)이 증가하였고, R+A는 에피네프린(p=.046)이 증가하였다. CON에서는 인슐린(p=.007)이 증가하였다. 이러한 결과로 보면 두 운동 그룹(A+R & R+A)이 통제그룹(CON)에 비하여 우수하고, 그리고 두 운동 그룹 중에서는 A+R이 R+A보다 좀 더 효과적임을 나타내었다. This study examined the effects of different performance sequences of aerobic and strength exercises for 10 weeks on the body composition, physical function, and hormones in males aged in their 20s. A total of 30 subjects (N=30) were assigned randomly to either aerobic and resistance exercise (n=10, A+R), resistance and aerobic exercise (n=10, R+A), or a control group (n=10, CON). The different order of aerobic (HRmax 50-80%, 30 min) and resistance (50-80% 1RM, 30 min) exercises for 10 weeks was consisted of 3 times per week and 80 minutes per session. The body composition, physical function, and hormones were measured before and after the training period. The lean body mass (p=.015) was increased and the fat mass (p=.042) and % body fat (p=.007) in the A+R were decreased. The skeletal muscle mass (p=.001) in the R+A was increased and % body fat was decreased (p=.003). The weight (p=.03) and % body fat (p=.039) in the CON were increased. The aerobic capacity (p=.011) and muscular endurance (p=.001) in the A+R group were improved. The muscular endurance (p=.0016) in the R+A was improved. The epinephrine (p=.048), norepinephrine (p=.013), and cortisol (p=.045) levels in the A+R group were increased. The epinephrine (p=.046) level in the R+A group was increased. The insulin (p=.007) level increased in the CON group. In conclusion, both A+R and R+A groups produced superior results to the CON group but the A+R group was slightly more efficient than the R+A group.

Solid‐Phase Total Synthesis of the Proposed Structure of Coibamide A and Its Derivative: Highly Methylated Cyclic Depsipeptides

Sable, Ganesh A.,Park, Jaekwan,Kim, Hyunsik,Lim, Soo‐,Jeong,Jang, Soonmin,Lim, Dongyeol WILEY‐VCH Verlag 2015 European Journal of Organic Chemistry Vol.2015 No.32

<P>The solid-phase total synthesis of the proposed structure of cyclic depsipeptide coibamide A and its derivative O-desmethyl coibamide A is reported. In this study, we demonstrate the solid-phase synthetic strategy and final solution-phase O-methylation for highly N-methylated cyclic depsipeptides. On-resin macrocyclization, N,N-dimethylation and solution-phase O-methylation were the key steps of these syntheses. The mass of synthetic coibamide A is consistent with that of the natural product according to liquid chromatography-mass spectroscopy (LCMS) analysis but significant differences are observed upon H-1 and C-13 NMR analysis. The 2D NMR analysis and modeling studies of the synthetic compound compared with the isolated natural compound revealed that either they are conformationally different or the stereochemistry of the natural product was incorrectly assigned.</P>

Efficiency of New Crankset Design by Evaluation of Characteristics of Muscle Activation and Range of Motion of Lower Extreme

Duy Huynh Quang,Jisoo Jeong,Jaekwan Lee,Dohyung Lim 한국재활복지공학회 2017 한국재활복지공학회 학술대회논문집 Vol.2017 No.11

도로인프라 동적정보를 활용한 공사작업구간 회피 자율협력주행 시스템

김시한(Shihan Kim),이재관(Jaekwan Lee),유시복(Sibok Yu),정경화(Kyeonghwa Jeong),박정태(Jungtae Park),박지훈(Jeehun Park) 한국자동차공학회 2020 한국 자동차공학회논문집 Vol.28 No.3

Thermodynamic Characteristics Associated with Localized Torrential Rainfall Events in the Southwest Region of the Korean Peninsula

Sueng-Pil Jung,Tae-Yong Kwon,Sang-Ok Han,Jong-Hyeok Jeong,JaeKwan Shim,Byoung-Choel Choi 한국기상학회 2015 Asia-Pacific Journal of Atmospheric Sciences Vol.51 No.3

This study uses observational data from radar and radiosonde to investigate the thermodynamic conditions related to localized torrential rainfall (LTR) in the southwest region of the Korean peninsula. Three criteria were defined for selecting LTR events: 1) hourly rainfall exceeding 30 mm h−1 recorded at any of the automated synoptic observing systems (ASOS) around Gwangju, 2) an area of rainfall at > 1 mm h−1 (as estimated from radar rain rate) of less than 20,000 km2, and 3) clearly defined stages of genesis and dissipation in a group of rain cells (> 10 mm h−1) with a duration lasting less than 24 hours. As a result, 10 cases were selected from the summer season (June-August) over the last decade (2004-2013). Results showed all cases occurred during the afternoon hours and that the duration and maximum rain area of convective cells (> 30 mm h−1) was less than 6 hours and smaller than 700 km2, respectively. The majority of cases showed the following thermodynamic characteristics: 1) strong convective available potential energy (CAPE > 1,500 J kg−1) related to surface heating, 2) weak (or no) convective inhibition (CIN < 50 J kg−1), 3) adequate moisture and total precipitable water (TPW ≈ 55 mm), and 4) values of storm relative helicity (SRH) of less than 10 m2 s−2. The area of rainfall (700 km2) and the duration (6 h) in this experiment were relatively small and short, respectively, compared to those in a previous study in the middle-west region of Korea (1,000 km2, 9 h), but a higher CAPE (1,500 J kg−1) and lower SRH (10 m2 s−2) were involved in this study than in the former (800 J kg−1, 120 m2 s−2).

Mineral/glass reinforced polypropylene compound 재질 엔진 커버의 피로거동 특성

김범근(Beomkeun Kim),김흥섭(Heungseob Kim),김용수(Yongsu Kim),조규철(Gyuchul Cho),정재관(Jaekwan Jeong) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Structural failure by fatigue of automotive engine cover is discussed. Fatigue properties of mineral/glass reinforced polypropylene compounds, as an alternative material for engine cover, were measured by experiments. The use of polypropylene compounds offers weight as well as cost reduction. Finite element analysis (FEA) has been performed to investigate the fatigue behavior of the engine cover. Assembly load due to the tightening of the bolts as well as the vibration load was considered to describe the actual loading conditions in durability test. Natural frequency of the system was extracted considering the damping effect of the structure. Dynamic time history of engine cover under vibration load was calculated based on the extracted natural frequency of the system and stress distributions at each load condition were predicted. Experimental modal analysis (EMA) was performed to identify the modal parameters and measurements of strains were performed to verify the results of the analysis. Based on the S-N curve data for engine cover material, distribution of safety factor was predicted by using the FEanalysis results. The calculated results were verified by experimental durability tests. Analysis results showed that contribution of the assembly load is not negligible to predict the fatigue failure of the engine cove.

자동차 엔진 커버의 피로 해석

김범근(Beomkeun Kim),김홍섭(Heungseob Kim),김용수(Yongsu Kim),조규철(Gyuchul Cho),정재관(Jaekwan Jeong) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-

Structural failure by fatigue of automotive engine cover is discussed. Fatigue properties of mineral/glass reinforced polypropylene compounds, as an alternative material for engine cover, were measured by experiments. The use of polypropylene compounds offers weight as well as cost reduction. Finite element analysis (FEA) has been performed to investigate the fatigue behavior of the engine cover. Assembly load due to the tightening of the bolts as well as the vibration load was considered to describe the actual loading conditions in durability test. Natural frequency of the system was extracted considering the damping effect of the structure. Dynamic time history of engine cover under vibration load was calculated based on the extracted natural frequency of the system and stress distributions at each load condition were predicted. Experimental modal analysis (EMA) was performed to identify the modal parameters and measurements of strains were performed to verify the results of the analysis. Based on the S-N curve data for engine cover material, distribution of safety factor was predicted by using the FEanalysis results. The calculated results were verified by experimental durability tests. Analysis results showed that contribution of the assembly load is not negligible to predict the fatigue failure of the engine cove