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.

유자씨에 함유된 limonin 및 nomilin의 추출 조건 최적화

정지영(Ji Young Jeong),우관식(Koan Sik Woo),황인국(In Guk Hwang),이연리(Youn Ri Lee),박의석(Eui Seok Park),정헌상(Heon Sang Jeong) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.5

유자씨의 limonin 및 nomilin에 대한 최적 추출조건을 선정하기 위하여 추출온도(30-70℃; X₁), 추출시간(1-5 hr; X₂) 및 교반속도(200-600 rpm; X₃)를 독립변수로 중심합성계획법에 따라 실험설계한 각각의 추출조건에서 limonin 및 nomilin 함량을 측정하였다. Limonin 및 nomilin 추출 조건의 최적화를 위하여 추출용매는 ethanol, 추출용매의 양은 20배 그리고 추출용매 농도는 60%로 선정하였다. Limonin 및 nomilin 추출에 미치는 추출조건의 영향은 추출온도가 가장 컸으며(p<0.01) 그 다음으로는 추출시간으로 나타났다. 반응표면분석결과 최적 추출조건은 limonin에서는 추출온도, 추출시간 및 교반속도가 각각 49.7℃, 3.3 hr 및 400.6 rpm으로 나타났으며, 이때의 추출량은 353.9 ㎎/100 g이었다. Nomilin은 각각 50.3℃, 3.5 hr 및 399.9 rpm이었으며, 추출량은 214.5 ㎎/100 g이었다. 동일조건에서의 실험값은 limonin 및 nomilin이 가각 338.8 및 219.5 ㎎/100 g으로 예측값과 실험값이 유사하여 최적화할 수 있었다. In this study, response surface methodology was employed in order to optimize the limonin and nomilin extraction conditions from citron seed. The independent variables were extraction temperature, extraction time, and shaking velocity. The yield of limonin and nomilin increased with increased extraction temperature and time. The extraction effects on the limonin and nomilin were higher at extraction temperature (p<0.01). The predicted extraction conditions were validated through actual experiments. The predicted conditions were as follows: 49.7℃ of extraction temperature, 3.3 hr of extraction time, and 400.6 rpm of shaking velocity for the maximum limonin contents (353.9 ㎎/100 g) and 50.3℃, 3.5 hr, and 399.9 rpm for the maximum nomilin contents (214.5 ㎎/100 g). The experimental values of limonin and nomilin contents at the predicted conditions were 338.8 and 219.5 ㎎/100 g, respectively. The predicted values at the optimized conditions were acceptable when compared to the experimental values.

Forming Properties of Micro Random Pattern Using Micro Abrasive Paper Tool by Roll to Plate Indentation Method

정지영(Ji-Young Jeong),제태진(Tae-Jin Je),문승환(SeungHwan Moon),이재령(Je-Ryung Lee),최대희(Dae-Hee Choi),김민주(Min-Ju Kim),전은채(Eun-chae Jeon) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.5

바이모프 압전소자를 이용한 운동량체크 신발에 관한 연구

정지영(Ji-young Jeong),채수웅(su-woong Chae),김윤희(yun-hee Kim),고서인(Seo-In Ko),김남윤(Nam-Yoon Kim) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.1

바이모프 압전소자를 이용한 자세교정 신발에 관한 연구

정지영(Ji-young Jeong),박지훈(Ji-hoon Park),김남윤(Nam-Yoon Kim) 한국통신학회 2015 한국통신학회 학술대회논문집 Vol.2015 No.11

TDABC와 공헌이익분석을 통한 항만배후단지 물류센터 원가관리 사례연구

정지영(Ji-Young Jeong),안기명(Ki-Myung Ahn) 한국항만경제학회 2015 韓國港灣經濟學會誌 Vol.31 No.3

본 논문은 부산항 신항 배후단지에 위치한 항만물류창고 업체들에 대한 원가관리 실태를 점검하고, 향후 업체들을 지원할 수 있는 원가관리 모델을 제시하여 그 이론과 방법을 연구하였으며, 이를 동 지역의 사례업체인 K사에 직접 적용해 봄으로써 그 모델이 동 지역 업체들의 원가관리에 유용하다는 것을 규명하는데 그 목적을 두고 있다. 이에 따라 개별 원가계산 관리 모델로서 전통적 원가계산, 활동기준 원가계산(ABC), 시간동인 활동기준 원가계산(TDABC)의 3가지 모델을 제시하여 비교 연구하였으며, 최소이익 원가관리 모델로서는 공헌이익 분석 모델을 제시해서 연구하였다. 3가지 개별 원가계산 관리 모델 중에서는 TDABC가 가장 진일보되고 유용한 모델이라는 것을 규명할 수 있었으며, 공헌이익 분석 모델은 동 지역 업체들의 최소이익 관리 모델로서 적합하다는 것을 확인할 수 있었다. The purpose of this case study is to verify the usefulness of three costing models and a minimum profit management model that can support the logistics warehouse companies in the Busan Newport Distri-park. This case study investigated traditional costing, activity-based costing (ABC), and time-driven ABC (TDABC); and suggested that an appropriate minimum profit management model is contribution margin analysis. Accordingly, in order to verify the usefulness of models, this case study surveyed the actual cost management conditions of companies, applied the three costing models to the “K” warehouse company in the Busan Newport Distri-park, and undertook a comparative study of the results. This case study produced two main findings. First, TDABC was verified as the most useful and advanced of the three costing models tested. Second, contribution margin analysis was confirmed to be the most suitable model to manage minimum profits for port warehouse companies in the Busan Newport Distri-park.

펩티도글리칸에 의한 단핵세포의 Tumor necrosis factor-α 발현 기전 연구

정지영(Ji-Young Jeong),손용해(Yonghae Son),김보영(Bo-Young Kim),김관회(Koanhoi Kim) 한국생명과학회 2019 생명과학회지 Vol.29 No.11

본 연구에서는 펩티도글리칸이 단핵세포의 TNF-α 발현에 미치는 영향을 조사하였고, 또한 펩티도글리칸에 의한 TNF-α 발현에 관련된 세포의 요소들을 연구하였다. 사람의 단핵세포주인 THP-1 세포를 펩티도글리칸에 노출시키는 경우 TNF-α 분비 증가뿐만 아니라 TNF-α 유전자 전사를 유도하는 결과를 가져왔다. TLR-2/4의 억제제인 OxPAPC은 펩티도글리칸에 의한 TNF-α의 발현을 저해하였다. 그리고 U0126, SB202190, SP6001250, LY294002, Akti IV, rapamycin, NAC, DPI 같은 약리학적 저해제 또한 TNF-α 발현을 유전자/단백질 수준에서 상당히 약화시켰다. 그러나 polymyxin B는 TNF-α 발현에 영향을 주지않았다. 따라서 펩티도글리칸이 TLR-2, PI3K, Akt, mTOR, MAPKs, ROS 등을 통하여 단핵세포의 TNF-α 발현을 증가시킴을 확인하였다. Peptidoglycan (PG) is found in atheromatous lesions of arteries, where monocytes/macrophages express inflammatory cytokines, including tumor necrosis factor-alpha (TNF-α). This study investigated the effects of PG on TNF-α expression and examined possible cellular factors involved in TNF-α upregulation. The overall aim was to identify the molecular mechanisms underlying inflammatory responses to bacterial pathogen-associated molecular patterns in the artery. Exposure of human THP-1 monocytic cells to PG enhanced the secretion of TNF-α and induced its gene transcription. Inhibition of TLR-2/4 with OxPAPC significantly inhibited TNF-α gene expression, whereas inhibition of LPS by polymyxin B did not. The PG-induced expression of TNF-α was also significantly suppressed by pharmacological inhibitors that modulate activities of cellular signaling molecules; for example, U0126 (an ERK inhibitor), SB202190 (a p38 MAPK inhibitor), and SP6001250 (a JNK inhibitor) significantly attenuated PG-induced transcription of TNF-α and secretion of its gene product. TNF-α expression was also inhibited by rapamycin (an mTOR inhibitor), LY294002 (a PI3K inhibitor), and Akt inhibitor IV (an Akt inhibitor). ROS-regulating compounds, like NAC and DPI, also significantly attenuated TNFα expression induced by PG. These results suggest that PG induces TNF-α expression in monocytes/ macrophages by multiple molecules, including TLR-2, PI3K, Akt, mTOR, MAPKs, and ROS.

산지별 마늘의 향기 항산화활성과 열처리 효과

정지영(Ji Young Jeong),우관식(Koan Sik Woo),황인국(In Guk Hwang),윤향식(Hyang?Sik Yoon),이연리(Youn Ri Lee),정헌상(Heon?Sang Jeong) 한국식품영양과학회 2007 한국식품영양과학회지 Vol.36 No.12

생마늘과 열처리에 따른 마늘의 향기 특성과 향기추출물의 항산화활성을 확인하고자 국내산 한지형 마늘 3종(단양, 서산, 의성마늘)과 난지형 마늘 3종(남해, 남도, 대서마늘), 중국산 마늘에 대하여 simultaneous distillation and extraction(SDE) 방법으로 향기 성분을 추출하여 GC/MS로 동정하고 항산화활성을 측정하였다. 생마늘의 주요 향기성분은 allyl methyl sulfide, methyl-2-propenyl disulfide, diallyl disulfide, 2-ethylidene-1,3-dithiane, methyl-2-propenyl trisulfide, di-2-propenyl trisulfide 및 2-vinyl-4H-1,3-dithiin 등으로 나타났다. 항산화활성이 우수한 것으로 알려진 diallyl disulfide, methyl-2-propenyl trisulfide 및 di-2-propenyl trisulfide 등은 중국산 마늘보다 한지형 마늘이 많이 함유하고 있었다. 향기성분은 열처리시 2-propanone, allyl mercaptan, methyl formic acid, 2-methyl butanal 2-methyl thiophene, methyl pyrazine, 2,2-dimethyl-1,3-dithiane 및 2-propenyl propyl disulfide 등이 새롭게 생성되었으며, allyl methyl sulfide, allyl alcohol 및 allyl sulfide 등의 분자량이 작은 화합물의 함량이 증가하였다. 산지별 생마늘의 향기 추출물에 대한 항산화활성은 농도 의존적으로 증가하였으며, 단양, 남해 및 중국산은 각각 20.07, 34.62 및 9.71%의 항산화활성을 나타내었고, 열처리 후에는 각각 79.90, 93.59 및 77.26%로 증가하였다. The objectives of this study were to compare the aroma characteristics and antioxidant activity of raw and heated garlic (130℃, 2 hr) from different cultivation areas (Danyang, Seosan, Uiseong Namhae, Namdo, Daeseo and China). The volatile compounds were extracted by simultaneous steam distillation extraction and identified with gas chromatography/mass spectrometer. The major volatile compounds of raw garlic were sulfur compounds such as diallyl disulfide, methyl-2-propenyl trisulfide, di-2-propenyl trisulfide etc. After heating, the major volatile compounds were allyl mercaptan, methyl pyrazine, 2,2-dimethyl-1,3-dithiane, 2-propenyl propyl disulfide, allyl methyl sulfide, allyl alcohol, and allyl sulfide etc. The DPPH radical scavenging activity (EDA, %) of volatile compounds from raw garlic and heated garlic was increased in a dose-dependent manner. The antioxidant activities (EDA, %) of volatile compounds from raw garlic cultivated in Danyang, Namhae and China were 20.07, 34.62, and 9.71% respectively. After heating, these values were increased to 79.90, 93.59, and 77.26% respectively. Results showed that heat treatment significantly enhanced the antioxidant activities (EDA, %) of the garlic.

CNN과 영상처리기술을 사용한 과수모니터링 시스템

정지영(Ji-young Jeong),최강민(Gang-min Choi),김민철(Min-Cheol Kim),김병욱(Byung-wook Kim),이인수(In-Soo Lee) 한국정보기술학회 2019 Proceedings of KIIT Conference Vol.2019 No.6

Marketing Strategies for Seasonality in Turkish Tourism

Ji-Young JEONG(정지영),Pianpian YANG(양피안피안) 전북대학교 산업경제연구소 2013 아태경상저널 Vol.5 No.2

계절적 변동은 세계적으로 가장 독특한 관광특성 중 하나로서 일반적으로 관광 산업의 주요 문제로 간주되고 있다. 본 논문은 마케팅 관점에서 터키관광을 예로 계절적 변동에 대응가능한 세가지 방법을 제시하였다. 계절적 변동 줄이기 위한 방안으로 전략 1을 제안하며, 전략 2을 통해 계절성 패턴의 강도를 높이는 방안을 제공한다. 전략 3은 전략 1과 전략 2를 결합한 방법이다. 본 연구는 궁극적으로는 마케팅 관점에서 관광 산업의 전체적인 수익개선과 경쟁력을 키워나가는데 그 목적을 두고 있다. 본 연구는 산업과 전략의 계절성 패턴에 관한 새로운 통찰력을 제공하며 본 연구에서 제시된 전략은 다른 나라, 특히 지중해 국가에도 일반화될 수 있다. Seasonality is one of the most distinctive features of tourism worldwide and is generally considered as the main problem in the tourism industry. This article takes tourism in Turkey as an example to illustrate possible ways to deal with seasonality pattern from a marketing point of view via providing three different strategies. Strategy 1 proposes mitigation of the degree of seasonality problem by attracting elder visitors who are not restricted by holiday’s seasons and have their own traveling preferences, and those who have a large potentiality to increase the number of visitors in “off-peak” such as China, Korea, and Japan. It investigates each target market’s characteristics and gives corresponding marketing suggestions. In contrast, strategy 2 presents increment of the degree of seasonality pattern by increasing German and Russian visitors who are the top two countries having most visitors in Turkey. Further, it describes and analyzes the characteristics of German and Russian visitors and proposes corresponding marketing suggestions. Strategy 3 combines strategy 1 and strategy 2 that are two plausibly contradicted strategies purported to decrease seasonality in “off-peak” season and to augment seasonality in “peak” season. Our eventual goal is to raise the total profitability and competitiveness of the tourism industry from a marketing point of view. This article provides a new insight into seasonality patterns in the tourism industry and strategies suggested from this article would be generalized into other countries, especially Mediterranean countries.