Duty, Task, Step 분석울 통한 전기·컴퓨터 분야의 DACUM Chart 활용 방안

박성종,지명석,류지호 한국직업능력개발원 2003 직업능력개발연구 Vol.6 No.2

Recently the DACUM methodology is widely used in vocational education fields because Curricula in vocational education, especially in engineering technology education, do not adequately mirror the needs of the work fields. DACUM Chart which contains a graphic portrayal of the duties and tasks identified, plus the descriptive lists of general knowledge and skills, future trends and concerns, worker behaviors, tools, equipments, supplies and materials is also useful. Certainly the DACUM methodology is effective, quick and low cost, but do not reflect the educational situation of internal vocational education institute effectively. The purpose of this study is to modify DACUM Chart for various work based learning strategies aimed at providing hands-on experience for students and consequently apply to curricula development. We performed the duty, task and step analyses through the verifications by expert workers, technicians and engineers of the workplace on the electricity and computer fields. Through this study, the practical tasks which must be instructed on the vocational education institute are suggested and modules are developed through the step analyses. So, we can reflect both the educational situation of vocational education institute internally and workplace effectively. And also we can manage curricula emphasizing the smooth transition of students from school to work to accept the needs of strategies for work based learning.

Temperature Effect on Coast-by Tire Noise

Ji Hong Jie,장명,김병삼 한국환경기술학회 2020 한국환경기술학회지 Vol.21 No.5

Tire noise decreases when temperature increases and the influence depend on tire-road combination. In order to quantitatively analyse the influence of the temperature on the transmission loss and the mechanism of tire occurrence, and to determine the influence of temperature on the noise source of different tread pattern tire, this paper studies the variation of coast-by noise level of a passenger car with five different tread patterns at 80 km/h with temperature is investigated, on ISO 10844:1994 test track surface, under different temperature conditions. The analysis of the results shows that increasing pavement temperature leads to a 0.45-0.885dB(A)/°C reduction in the coast-by noise levels and a 0.029dB(A)/°C reduction in the coast-by transmission loss.

Incorporation of carboxybetaine methacrylate into poly(methyl methacrylate) to prevent multi-species biofilm formation

Jie Jin,Ji-Yeong Kim,최우진,Myung-Jin Lee,Ji-Young Seo,Jaehun Yu,Jae-Sung Kwon,Jinkee Hong,Sung-Hwan Choi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-

Carboxybetaine methacrylate (CBMA), which has anti-biofouling properties, was incorporated into poly(methyl methacrylate) (PMMA) to prevent multi-species biofilm formation without impairing the criticalmechanical properties of the PMMA. The incorporation of 2-methacryloyloxyethyl phosphorylcholine(MPC, 3 wt%) was used as a positive control. PMMA wettability was found to increase with increasingCBMA content. The addition of CBMA resulted in decreased mechanical properties of PMMA. Theincorporation of 3% CBMA into PMMA resulted in considerable long-term anti-biofouling effects thatreduce adhesion of various fungi, bacteria (Candida albicans, Actinomyces naeslundii, and Veillonellaparvula), and a human saliva-derived biofilm. The anti-biofouling effect of CBMA-incorporated PMMAsurpassed that of the positive control. By calculating the intensity of the collective band using Ramanspectroscopy, CBMA was proven to form the most stable hydration layer. Neither CBMA nor MPC groupsshowed cytotoxicity. Occlusal splints fabricated using 3% CBMA showed clinically acceptable aestheticproperties with slight turbidity. Despite a limitation in terms of deteriorations of the mechanicalproperties, the addition of an appropriate amount of CBMA to PMMA inhibited the attachment of fungiand bacteria and suppressed multi-species biofilm growth. The aesthetic properties of CBMAincorporatedPMMA are acceptable for clinical practice.

Effect of Water Absorption and Loss Characteristics of Fine Aggregates on Aggregate-Asphalt Adhesion

Jie Ji,Yang Dong,Ran Zhang,Zhi Suo,Chenwei Guo,Xu Yang,Zhanping You 대한토목학회 2021 KSCE Journal of Civil Engineering Vol.25 No.6

This study aims to investigate the effect of aggregate water absorption and loss characteristics on aggregate-asphalt adhesion. Lab tests were designed to analyze the water absorption and loss characteristics of limestone, basalt. and steel slag fine aggregates with different particle sizes under various temperatures and humidity conditions. Meanwhile, the low temperature nitrogen adsorption test, combined with the Brunauer, Emmett and Teller (BET) theory and Barret, Joyner and Halend (BJH) model, were used to calculate the specific surface area and pore size distribution of aggregate. Moreover, the asphalt-aggregate adhesion was evaluated by the net adsorption test. The results indicated that the change trends of water absorption and loss for the aggregates exhibited two stages. In the first stage, the amounts of water absorption and loss of aggregates were large and their change rates were high, while in the second stage, an opposite trend was observed. Humidity had the greatest influence on the water absorption and loss of aggregates, followed by aggregate particle size, contact time, temperature, and aggregate type. The smaller-sized aggregates had greater specific surface area, which led to a higher sensitivity to temperature and humidity changes. In comparison, the 0.3 mm-sized aggregate had a large capillary energy inside the pores, and it was the most sensitive to moisture. The steel slag aggregate had the strongest adhesion with asphalt, followed by the limestone aggregate, and the worst was basalt aggregate.

Relation between Frequency of Fruit and Vegetable Intake and Mental Health among Korean Women on Korea National Health and Nutrition Examination Survey 2014~2016

Jie Ji,Yookyung Kim,Woo-Kyoung Shin 한국식품영양과학회 2018 한국식품영양과학회 학술대회발표집 Vol.2018 No.10

Incorporation of carboxybetaine methacrylate into poly(methyl methacrylate) to prevent multi-species biofilm formation

Jin, Jie,Kim, Ji-Yeong,Choi, Woojin,Lee, Myung-Jin,Seo, Ji-Young,Yu, Jaehun,Kwon, Jae-Sung,Hong, Jinkee,Choi, Sung-Hwan Elsevier 2020 Journal of industrial and engineering chemistry Vol.86 No.-

<P><B>Abstract</B></P> <P>Carboxybetaine methacrylate (CBMA), which has anti-biofouling properties, was incorporated into poly(methyl methacrylate) (PMMA) to prevent multi-species biofilm formation without impairing the critical mechanical properties of the PMMA. The incorporation of 2-methacryloyloxyethyl phosphorylcholine (MPC, 3wt%) was used as a positive control. PMMA wettability was found to increase with increasing CBMA content. The addition of CBMA resulted in decreased mechanical properties of PMMA. The incorporation of 3% CBMA into PMMA resulted in considerable long-term anti-biofouling effects that reduce adhesion of various fungi, bacteria (<I>Candida albicans</I>, <I>Actinomyces naeslundii</I>, and <I>Veillonella parvula)</I>, and a human saliva-derived biofilm. The anti-biofouling effect of CBMA-incorporated PMMA surpassed that of the positive control. By calculating the intensity of the collective band using Raman spectroscopy, CBMA was proven to form the most stable hydration layer. Neither CBMA nor MPC groups showed cytotoxicity. Occlusal splints fabricated using 3% CBMA showed clinically acceptable aesthetic properties with slight turbidity. Despite a limitation in terms of deteriorations of the mechanical properties, the addition of an appropriate amount of CBMA to PMMA inhibited the attachment of fungi and bacteria and suppressed multi-species biofilm growth. The aesthetic properties of CBMA-incorporated PMMA are acceptable for clinical practice.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

De novo malignancy after liver transplantation

Peng Ji Gao,Jie Gao,Zhao Li,Zhi Ping Hu,Ji Ye Zhu 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.88 No.4

Purpose: The aim of this study is to evaluate the incidence of de novo malignancy after liver transplantation (LT) and compare with those among the general Chinese population. Methods: A total of 466 patients who had a minimum follow-up time of 6 months were enrolled in the study. All data of medical records and follow up were retrospectively reviewed. Results: The incidence rate of de novo malignancy was 3.0% (14 in 466 patients). The median elapsed time from transplant to the diagnosis of de novo malignancy was 42 months (range, 6 to 106 months). The cumulative risk for development of de novo malignancy was 1.6%, 2.7%, and 8.2% at 3, 5 and 10 years after LT, respectively. The patients were all male. The types of de novo tumors included digestive system tumor (8 in 14), lung cancer (2 in 14), urologic neoplasm (2 in 14), and hematologic malignant tumor (2 in 14). Over a mean follow-up of 24 months after diagnosis of de novo malignancy, 7 patients (50.0%) died; the overall 5-year patient survival rate was 54.5%. The relative risk of malignancy following LT was 9.5 folds higher than the general Chinese population. Conclusion: The relative risk of malignancy following LT was much higher than the general Chinese population. Digestive system tumor is the most common type of de novo malignancy after LT in China.

Nicotine exacerbates tacrolimus-induced renal injury by programmed cell death

( Yu Ji Jiang ),( Sheng Cui ),( Kang Luo ),( Jun Ding ),( Qi Yan Nan ),( Shang Guo Piao ),( Mei Ying Xuan ),( Hai Lan Zheng ),( Yong Jie Jin ),( Ji Zhe Jin ),( Jung Pyo Lee ),( Byung Ha Chung ),( Bum 대한내과학회 2021 The Korean Journal of Internal Medicine Vol.36 No.6

Background/Aims: Cigarette smoking is an important modifiable risk factor in kidney disease progression. However, the underlying mechanisms for this are lacking. This study aimed to assess whether nicotine (NIC), a major toxic component of cigarette smoking, would exacerbates tacrolimus (TAC)-induced renal in-jury. Methods: Sprague-Dawley rats were treated daily with NIC, TAC, or both drugs for 4 weeks. The influence of NIC on TAC-caused renal injury was examined via renal function, histopathology, oxidative stress, mitochondria, endoplasmic reticulum (ER) stress, and programmed cell death (apoptosis and autophagy). Results: Both NIC and TAC significantly impaired renal function and histopathology, while combined NIC and TAC treatment aggravated these parameters beyond the effects of either alone. Increased oxidative stress, ER stress, mitochondrial dysfunction, proinflammatory and profibrotic cytokine expressions, and programmed cell death from either NIC or TAC were also aggravated by the two combined. Conclusions: Our observations suggest that NIC exacerbates chronic TAC nephrotoxicity, implying that smoking cessation may be beneficial for transplant smokers taking TAC.

Polyelectrolyte nanoparticles based thin-film nanocomposite (TFN) membranes for amino acids separation

Yan-Li Ji,Wei-Jie Qian,Quan-Fu An,Kueir-Rarn Lee,Cong-Jie Gao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-

We have designed a novel type of thin-film nanocomposite (TFN) membranes with embedded polyelectrolyte nanoparticles (PNPs) and investigated their applicability in the separation of amino acids. PNP particles were mixed with piperazine (PIP) and interfacial polymerized with trimesoyl chloride (TMC), allowing for simultaneous improvement in water permeability, amino acid selectivity, and anti-fouling property. Separation performance could be conveniently tuned by modulating the chemical structure of PNPs and their content in TFN membranes, as well as adjusting the feed pH value. This work would promote the application of polyelectrolyte nanoparticles based TFN membranes in the separation and purification of amino acids.

Research and Application of Fiber Bragg Grating Sensor in Geological Disaster Automation Monitoring

Liu Yimin,Wang Jie,Ji Weifeng,Zhou Ce,Chen Wenjun 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.10

In this paper, fiber grating technology is used for accurately measure stresses, temperature and displacement. The paper introduces the basic principles of FBG technology and the wavelength demodulation method of FBG sensors, and put fiber grating technology into practical engineering projects. The paper design a optical fiber grating real-time automation monitoring system to distributed measure stress, temperature and displacement in geological disaster body, to provide effective technical supports for geological disaster prevention and mitigation.