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냉동 수산물의 저장 온도 관리를 위한 Time-temperature Indicator와 비전 기반 Indicator 분석 프로그램 개발
장명기 ( Myung-kee Jang ),홍창욱 ( Chang-wook Hong ),최재혁 ( Jae-hyuk Choi ),김꽃봉우리 ( Koth-bong-woo-ri Kim ),최정욱 ( Jeong-wook Choi ),남택정 ( Taek-jeong Nam ),안동현 ( Dong-hyun Ahn ) 한국수산과학회(구 한국수산학회) 2018 한국수산과학회지 Vol.51 No.1
We develop a time-temperature indicator (TTI) that can determine whether thawing of fish and other fishery products has occurred during frozen storage. A polypropylene tube with an internal diameter of 3 mm was prepared and cut to a length of 14 to 20 mm. One end of the tube was thermally sealed and 0.1% acetic acid was injected into the other end; the tube was then frozen at 20℃. Then the open side of the frozen tube was blocked by sinking the tube into a 10% gelatin solution. The tube was attached to a polyvinyl packaging bag along blue litmus paper and the bag was put into a freezer at -20℃. After freezing, the bag was removed to an ambient temperature of 20℃, and the time dependence of the color change of the litmus paper was observed. The color changed from blue to red, with the length of the red region increasing with time. Our TTI can be used as a part of a visible detection system and the detection program can conduct the elapsed time analysis on the length of the red region of the litmus paper indicating the degree of thawing. Thus, the TTI is a useful tool in the temperature management of frozen fish and fishery products.
건강한 폐경 후 여성에서 혈중 비타민 D 농도와 체질량지수의 상관관계
장선영 ( Sun Young Jang ),이지영 ( Ji Young Lee ),배재만 ( Jae Man Bae ),이철만 ( Chul Min Lee ),홍성남 ( Sung Nam Hong ),김아리 ( A Ri Kim ),김흥열 ( Heung Yeol Kim ) 대한산부인과학회 2012 Obstetrics & Gynecology Science Vol.55 No.6
목적 비만은 체내 비타민 D의 농도와 연관되어 있는 것으로 알려져 있다. 이에 폐경 여성의 혈중 비타민 D 농도와 체질량지수로 평가한 비만과 의 상관관계를 알아보고자 한다. 연구방법 혈중 비타민 D 농도와 비만과의 관계를 알아보기 위해 본 연구는 2005년 1월부터 2011년 3월까지 310명의 건강한 폐경 여성을 대상으로 혈중 25hydroxy vitamin D 농도와 체질량지수로 비만도를 측정하고, 골밀도, 골표지자 및 부갑상선 호르몬 농도와 같은 골건강 지표들을 측정하였다. 혈중 비타민 D 부족의 기준을 30ng/mL, 20ng/mL로 각각 나누어 체질량지수를 비롯한 각종 변수들과의 상관관계를 분석하였다. 결과 혈중 비타민 D 부족을 30ng/mL 기준으로 하였을 때 98.9%가, 20ng/mL를 기준으로 하였을 때 87.8%가 비타민 D 결핍증을 보였다. 연령, 신장, 체중, 골밀도, 골표지자 모두 비타민 D 농도와 유의한 상관관계를 보이지 않았고 부갑상선 호르몬 농도는 혈중 비타민 D 농도와 음의 상관관계를 보였다. 체질량지수는 비타민 D와 음의 상관관계를, 부갑상선 호르몬 농도와 양의 상관관계를 보였으나, 통계적으로 유 의하지 않았다. 결론 폐경 여성 중 약 87.8%-98.9%인 대다수 여성이 비타민 D 부족상태를 보이며 혈중 비타민 D 농도와 체질량지수 사이에 유의한 상관관계 는 없었다. Objective Obesity is associated with alterations in vitamin D (VtD) system. We evaluated the correlation between VtD level and body mass index (BMI), a standard for the evaluation of obesity in postmenopausal women. Methods To study the relationship between VtD levels and obesity, we recruited 310 healthy postmenopausal women between January 2005 and March 2011 and analyzed the correlation between BMI and serum 25-hydroxyvitamin D (25-OH-VtD) level. We also analyzed the relationship between serum VtD level and bone health status such as bone mineral density measured by dual-energy X-ray absorptiometry, bone turnover marker, and parathyroid hormone (PTH), Results With a cut-off level for VtD deficiency at 30ng/mL, 98.9% patients showed a VtD deficiency, while 87.8% patients showed a vitamin D defi ciency with a 20-ng/mL cut-off level. VtD levels had no signifi cant correlation with age, height, weight, BMI, or bone turnover markers. PTH level and serum 25-OH-VtD level showed a negative correlation, VtD level showed negative correlation with BMI, but statistically not signifi cant. Conclusion In this study, most of postmenopausal women (more than 87.8%) had a VtD defi ciency, and VtD level showed negative correlation with BMI, but was not statistically signifi cant.
장향연 ( Hyang-youn Chang ),박나리 ( Na-ri Park ),장여주 ( Yeo-ju Jang ),임현만 ( Hyun-man Lim ),정진홍 ( Jin-hong Jung ),김원재 ( Weon-jae Kim ) 한국수처리학회(구 한국수처리기술연구회) 2018 한국수처리학회지 Vol.26 No.5
The treatment efficiency of dissolved air flotation (DAF) process depends greatly on the operating characteristics of the microbubble generating system. In this study, the indices to compare and quantify the microbubble generation characteristics have been reviewed comprehensively such as ① representative size (㎛), ② number density distribution (counts/mL), ③ specific interfacial area (m2/m3), and ④ specific volume (ppm, v/v). A microbubble generating system utilizing saturation tank type, which has been most commonly applied in DAF processes, was fabricated on a pilot scale and the behavior of the above indicators was monitored while varying the conditions of operating pressure and flow rate. As a result, according to the operating pressure, the representative size increased until the operating pressure reached 3.5 kgf/cm<sup>2</sup>, and then decreased continuously as the preassure increased. Microbubbles in the range of 20 - 50 ㎛ were formed at the maximum with the condition of 3.5 - 4.5 kgf/cm<sup>2</sup>. The values of specific interfacial area and specific volume also showed the maximum at 3.5 - 4.5 kgf/cm<sup>2</sup>. For the operating flow rate, the representative size continuously increased with the increase of the flow rate. The specific interfacial area and specific volume reached their maximum values at the condition of 45 - 50 L/min. As a result of examining the indices of microbubble generation characteristics for a pilot scale generating system, it could be concluded that the applicability of the specific interfacial area and specific volume were better than that of the representative size and number density distribution.
재미이론의 ‘패턴’에 근거하여 몰입 유발을 위한 어드벤처 게임 개발
강재우(Jae-Woo Kang),최민아(Min-A Cheo),엄주희(Joo-Hee Um),성재호(Jae-Ho Sung),김소영(So-Young Kim),김현준(Hyeon-Jun Kim),손유진(Yu-Jin Son),이주연(Ju-Yeoun Lee),장새리(Sae-Ri Jang),강명주(Myung-Ju Kang),박찬일(Chan-Il Park),이종원(Jong 한국컴퓨터정보학회 2014 한국컴퓨터정보학회 학술발표논문집 Vol.22 No.2
수많은 사람들이 게임을 제작 및 개발함에 있어, 많은 학자들이 다양한 방법으로 오랜 세월에 걸쳐 연구한 게임의 인문학적 정의 및 재미 이론은 현대의 게임 개발에 있어서도 그 이론적 배경을 담당하는 주춧돌의 역할을 맡고 있다. 본 논문에서는 청강문화산업대학교 게임전공의 게임 개발 프로젝트의 일환으로 구성된 "안드로메다" 팀이 Unity 3D 엔진을 기반으로 제작한 3D 생존어드벤처 게임 “1 Hour”를 개발한 과정을 기술하였고, 그 과정에서 재미 이론의 "패턴"에 근거하여 플레이어로 하여금 몰입을 유발시키는 어드벤처 장르의 게임 디자인을 제시하는 것을 이번 연구의 목적으로 하였다. 연구 과정은 문헌 연구 및 개발 게임("1 Hour")의 플레이 테스트 등을 통해 게임에서의 몰입의 과정을 분석하였고, 몰입 유발 효과 증명을 위해 ‘패턴과 몰입의 상관관계’에 대한 가설들을 수립하고 실험을 실시하여 그 결과를 분석하였다.
K계열 함침 탄소계 흡착제의 실내 저농도 이산화탄소 흡착성능 강화
정세은,이유리,원유섭,김재영,장재준,김하나,조성호,박영철,남형석,Jeong, Se-Eun,Wang, Shuang,Lee, Yu-Ri,Won, Yooseob,Kim, Jae-Young,Jang, Jae Jun,Kim, Hana,Jo, Sung-ho,Park, Young Cheol,Nam, Hyungseok 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
Relatively high indoor CO<sub>2</sub> concentration (>1,000 ppm) has a negative impact on human health. In this work, indoor CO<sub>2</sub> adsorbent was developed by impregnating KOH or K<sub>2</sub>CO<sub>3</sub> on commercial activated carbon, named as KOH/AC and K<sub>2</sub>CO<sub>3</sub>/AC. Commercial activated carbon (AC) showed relatively high BET surface area (929 m<sup>2</sup>/g) whereas KOH/AC and K<sub>2</sub>CO<sub>3</sub>/AC presented lower BET surface area of 13.6 m<sup>2</sup>/g and 289 m<sup>2</sup>/g. Two experimental methods of TGA (2,000 ppmCO<sub>2</sub>, weight basis) and chamber test (initial concentration: 2,000 ppmCO<sub>2</sub>, CO<sub>2</sub> IR analyzer) were used to investigate the adsorption capacity. KOH/AC and K<sub>2</sub>CO<sub>3</sub>/AC exhibited similar adsorption capacities (145~150 mg<sub>CO2</sub>/g), higher than K<sub>2</sub>CO<sub>3</sub>/Al+Si supports adsorbent (84.1 mg<sub>CO2</sub>/g<sub>sample</sub>). Similarly, chamber test also showed similar trend. Both KOH/AC and K<sub>2</sub>CO<sub>3</sub>/AC represented higher adsorption capacities (KOH/AC: 93.5 mg<sub>CO2</sub>/g K<sub>2</sub>CO<sub>3</sub>/AC: 94.5 mg<sub>CO2</sub>/g<sub>sample</sub>) K<sub>2</sub>CO<sub>3</sub>/Al+Si supports. This is due to the KOH or K<sub>2</sub>CO<sub>3</sub> impregnation increased alkaline active sites (chemical adsorption), which is beneficial for CO<sub>2</sub> adsorption. In addition, the regeneration test results showed both K-based adsorbents pose a good regeneration and reusability. Finally, the current study suggested that both KOH/AC and K<sub>2</sub>CO<sub>3</sub>/AC have a great potential to be used as CO<sub>2</sub> adsorbent for indoor CO<sub>2</sub> adsorption.
홍성준 ( Seong-jun Hong ),이민희 ( Min-hee Lee ),장재리 ( Jae-ri Jang ),정하은 ( Ha-eun Jeong ),홍유리 ( Yu-ri Hong ),이지항 ( Jee-hang Lee ),김진 ( Jin Kim ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2
최근 현대인의 영양불균형이 점점 심화됨에 따라 영양결핍과 비만의 위험도가 점점 증가하고 있다. 이에 따라 건강기능식품에 대한 관심이 증가하여 일반인들의 건강기능식품 소비가 증가하고 있지만, 적정섭취량에 비해 영양소를 과도하게 섭취 중이거나 영양제를 먹지만 정작 필요한 영양소를 섭취하지 못하는 경우가 빈번히 나타나고 있다. 이러한 문제를 해소하고자 본 논문에서는 7 일간 사용자가 섭취한 식단을 기반으로 부족한 영양소를 수치상으로 계산하여 개인 맞춤 영양제를 추천하는 시스템을 제안한다.
추호정 ( Ho Jung Choo ),남윤자 ( Yun Ja Yuri ),이유리 ( Yu Ri Lee ),이하경 ( Ha Kyung Lee ),이성지 ( Sung Ji Lee ),이새은 ( Sae Eun Lee ),장재임 ( Jae Im Jang ),박진희 ( Jin Hee Park ),최진우 ( Jin Woo Choi ),김도연 ( Do Yuon Kim 한국의류산업학회 2012 한국의류산업학회지 Vol.14 No.4
The purpose of this study was to analyze research trends and make suggestions regarding the future of information technology (IT) in the fashion industry. In this study, 437 papers written regarding IT fashion from five major journals published between 2000 and 2011 were examined. The research areas were then organized by subject and keyword, and divided into 16 high-context categories. Two IT fashion maps were constructed, one from a fashion consumer`s perspective, and the other based on the fashion industry`s supply chain. This study identified important trends in IT fashion such as: 3D scanners, 3D digital renderings of the human form, 3D digital garments, smart garments, mass customization, production automation, online shopping, home shopping, online communities, e-commerce, digital media, virtual reality, e-tail, the digital generation, E-CRM, and education. Data from body scans was collected and applied to production, and research on smart textiles was also carried out. As for IT fashion`s service areas, the majority of the research focused on online shopping or online communication. Additionally, research done on avatars and cyber space, and studies on social networking services are shown. The results of this study indicated that a new field of research has opened and that current research has been developing. Also, this study showed what is needed to expand and strengthen IT fashion.
( Miratul Maghfiroh ),임현만 ( Lim Hyun-man ),안광호 ( Ahn Kwang-ho ),정진홍 ( Jung Jin-hung ),장여주 ( Jang Yeo-ju ),장향연 ( Chang Hyang-yeon ),박나리 ( Park Na-ri ),김원재 ( Kim Weon-jae ) 한국물환경학회 2020 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2020 No.-
Water shortage becomes apparent threat whereby millions of people in the world are estimated to have experienced it even for a year-round. Recycling, reusing and reclaiming wastewater are among countermeasures to wisely utilize water in the future. Natural zeolites cater capabilities to recover polluted water. Zeolites act as ion exchangers by which favorable ions are adsorbed into active sites in the zeolite frameworks in exchange to ions with less affinity. These materials are also comparatively inexpensive and low-energy cost in maintenance especially for up-scale practices. We studied the performance of Korean domestic natural zeolites through column tests by analyzing breakthrough curves and evaluated the data according to Adam-Bohart and Thomas models. This study benefits to gain insights on appropriate design parameters for pilot scale in the future. Based on XRD analysis, our natural zeolites contain heulandite, clinoptilolite, mordenite, and quartz. It was also revealed that silica was 74.3% and aluminum compound was 14.6%. Column tests were carried out in a continuos flow with synthetic ammonium solutions of 50 mg/L as the influent. Bed height was 27.5 cm and particle sizes of zeolites were 1.18-2.36 mm. Two vertical velocities (5 m/h and 2.5 m/h) were chosen in this study. Observations of ammonium concentrations were monitored at certain times until breakthrough was reached around 50%. According to the curves, breakthrough of 0.05 Ct/C0 was achieved after 1.7 hours and 5.6 hours when using 5 m/h and 2.5 m/h vertical velocity correspondingly. We also challenged our experimental data against two common models for sorption in packed bed i.e. Adam-Bohart and Thomas models using non-linear regression approaches. We found that Thomas model fitted the experimental data well showing R<sup>2</sup>>0.92 with SSE<0.04. Adam-Bohart model explained mass balance of sorption process while Thomas model assumes that the reactions in packed bed are reversible.