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절삭 깊이의 무작위 제어를 적용한 다이아몬드 선삭공정에서 소재회전 반경에 따른 미세패턴의 크기변화 분석 연구
정지영,한준세,최두선,제태진,Jeong, Ji-Young,Han, Jun-Se,Choi, Doo-Sun,Je, Tae-Jin 한국금형공학회 2020 한국금형공학회지 Vol.14 No.1
Ultra-high brightness and thin displays need to optical micro-patterns which can uniformly diffuse the lights and low loss. The micro random patterns have characteristics to rise the optical efficiency such as light extraction, uniform diffusion. For this reason, various fabrication processes are studied for random patterns. In this study, the micro random patterns were machined by diamond turning which used a controlled cutting tool path with random cutting depth. The machined patterns had random shape and directionality along the circumferential direction. The average width and length of machined random pattern according to rotation radius were 40.13㎛~55.51㎛ and 37.25㎛~59.49㎛, and these results were compared with the designed result. Also, the machining error according to rotation radius in diamond turning using randomly controlled cutting depth was discussed.
방임 및 보호 아동·청소년 원가정 회복지원 시범사업의 현황과 과제
정지영,안진경,김은혜,Jeong, Jeeyoung,Anh, Jinkyung,Kim, Eunhye 한국가족자원경영학회 2021 가족자원경영과 정책 Vol.25 No.3
Child abuse and neglect are recently increasing in Korea, and although the government has actively improved the child protection system, the number of abused children and the rate of cases judged as abuse have continuously risen. Given that 75% of child abusers are parents, child abuse and neglect are expected to recur. To prevent such a recurrence, various intervention programs for abused children and their parents are required. The purpose of this study were to design a recovery support service process and investigate the effectiveness of pilot program for families of origin, including neglected(protected) children, to improve the system by which these programs are operated, and formulate policy alternatives that reinforce "family preservation" principles. The pilot program was implemented from June to November 2020 in 4-local healthy family support center. The number of program participants and the frequency of participation in each other differed, because of the difference in number of confirmed coronavirus cases in each region and the requirement for social distancing. Through the program, a community-based service process was developed for neglected(protected) children and their parents, and cooperative networks between related facilities and institutions were established. The study formulated the following recommendations: First, a cooperation system among government departments mandated to provide different services to neglected(protected) children is needed. Second, wider and various channels through which abused children can avail of protective services should be developed within communities. Third, more stable environments for program operation should be cultivated, and cooperative partnerships should be sought for knowledge sharing among relevant government departments. Another necessary measure is for a center to develop its own business model, in which the duplication of services provided by involved organizations is avoided. Finally, clear guidelines, administrative standards, and specific plans for program operation should be arranged. Also regional characteristics are maintained, but services should be standardized.
LED터널등 모듈의 폐열활용을 위한 열전소자의 발전 성능 분석
정지영(Ji-Young Jeong),허인성(In-Sung Her),이세일(Se-Il Lee),김명호(Myeong-Ho Kim),유영문(Young Moon Yu) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.8
In this paper, we propose the LED(Light-Emitting-Diode) emergency lighting in a tunnel by using the thermoelectric devices. To achieve high generated power, thermoelectric device should be have high Seebeck coefficient and small contact area. Also, we reveal that a moderate heatsink required for high generated power. From the waste heat of LED tunnel lighting module (25W), the generated power was 0.062W by thermoelectric device, and it could illuminate for 1hour after charge the battery of emergency lighting during about 101hours.
정지영(Jiyoung Jeong),신충수(Choongsoo S. Shin) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Dynamic balance is an ability to maintain stable position while performing various tasks and it has been reported that dynamic balance associated with athletic performance and injury risks. The purpose of study was to examine the effect of core strength on dynamic balance. Nineteen males completed 10-week core training interventions. To test the core strength, a trunk endurance test was used. During this test, the plank and side-plank positions were maintained for as long as possible. The star excursion balance test (SEBT) were conducted before and after core training to measure the dynamic balance. Plank records and SEBT parameters were compared using a paired Student’s t-tests at a significance level of 0.05. Greater plank and left/right side plank record were found in post-training (p=0.008, p=0.049, and p=0.007 respectively), thus the core muscle strength increased after training. As the SEBT results, greater anterior, anteromedial, medial, posteromedial, posterior, posterolateral reach distances were found between pre- and post-training, but there was no significant differences in lateral and anterolateral distances. These results indicate that strengthening of core muscle increase the dynamic balance, thereby it positively affected in lower extremity injury risk.