간행물

공학기술논문지 update

Journal of advanced engineering and technology

  • : 조선대학교 공학기술연구원
  • : 공학분야  >  기타(공학)
  • : KCI등재
  • :
  • : 연속간행물
  • : 계간
  • : 2005-3142
  • :
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수록정보
14권2호(2021) |수록논문 수 : 7
간행물 제목
14권3호(2021년 09월) 수록논문
최근 권호 논문
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KCI등재

1녹나무 잎의 반응표면분석법을 이용한 환류냉각 추출조건 최적화 및 생리활성

저자 : 임상휘 ( Sang Hwi Im ) , 김경철 ( Kyeoung Cheol Kim ) , 김지호 ( Ji Ho Kim ) , 박미현 ( Mi Hyeon Park ) , 김주성 ( Ju-sung Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 115-120 (6 pages)

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Experiments were conducted to increase the efficiency of extracting bioactive compounds from Cinnamomum camphora leaves which are industrially used in various fields. Response surface methodology (RSM) maximized the total polyphenol content in extracting C. camphora leaves. The experimental design was conducted for three factors: extraction temperature, ethanol concentration, and solid-liquid ratio. The optimum conditions for the total polyphenol content of C. camphora leave extract were found to be an extraction temperature of 80℃, an ethanol concentration of 55%, and a solid ratio of 100; the predicted value was confirmed to be 57.67 ± 0.66 mg GAE/g. As a result of the experiment, the total polyphenol content of the optimized extract of C. camphora leaves was 57.29 ± 0.41 mg GAE/g, and the total flavonoid content was 10.57 ± 0.20 mg QE/g. The antioxidant activity was also measured at 25.98 ± 0.67 μg/mL for DPPH RC50, higher than the control group BHT (122.69 ± 10.55 μg/mL). TEAC was 239.39 ± 11.28 μM TE/g, and FRAP was 2,049.62 ± 32.45 mM FE/g. Moreover, the inhibitory effect of tyrosinase and Staphylococcus epidermidis was confirmed. The results of this study suggest the optimal conditions for maximum extraction of total polyphenol content from C. camphora leaves, and it is expected to be essential data for industrial use through the physiological activity of optimized extracts.

KCI등재

2유기용매 추출에 따른 금화규 꽃 오일 추출물의 항산화 활성 및 성분 분석

저자 : 최문희 ( Moon-hee Choi ) , 김수민 ( Su-min Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 121-127 (7 pages)

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Aurea helianthus (AH), a representative warm-temperature plant in southern Korea, is traditionally used in China for various medicinal purposes. The bioactive constituents from aerial parts of the AH leaf, stem, and flowers have been studied by several researchers, showing anti-inflammation, immune-modulatory, antioxidant, and whitening effects. However, the effects of the oil extracts of AH flower on the biological activities for antioxidants application have not been thoroughly investigated. This study reported the possible utilization of the oil extracts of AH flower extracts (AHF) and validated the components by GC-MS. The AHF was treated with n-hexane, chloroform, and methanol, respectively. Besides the component analysis of the extract, the antioxidant activities were determined with 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and 2,2'-azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging assay. The chloroform and methanol extracts showed the highest antioxidant activities and active ingredient contents like the total phenolic and flavonoid contents. GC-MS analysis were determined to be at a maximum in the hexane extracts. In summary, The oil extracts of AHF are helpful as plant resources that can provide good antioxidants and can be used as potential natural healthy food.

KCI등재

3국내산 생달나무 오일 추출물의 지용성 성분 및 항산화 활성 검증

저자 : 양승화 ( Seung-hwa Yang ) , 김나인 ( Nain Kim ) , 주현진 ( Hyun-jin Ju ) , 최문희 ( Moon-hee Choi ) , 신현재 ( Hyun-jae Shin )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 129-135 (7 pages)

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Cinnamomum yabunikkei H. Ohba is known as a traditional medicinal plant in Korea. There has been no study done about the lipid compound and biological activity in solvent extracts of C. yabunikkei. In this study, the solvent extract (hexane, chloroform:methanol [2:1, v/v]) of C. yabunikkei leaf, branch, and fruit were investigated for their antioxidant activities and active constituents. The antioxidant properties were evaluated based on 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging, ABTS radical scavenging, and lipid peroxidation activity. The branch extract showed the highest DPPH, ABTS, and lipid peroxidation. Antioxidant active substances present in the solvent extract of C. yabunikkei have been analyzed by GC-MS. In summary, C. yabunikkei solvent extracts could be used as a potential natural cosmetic ingredient.

KCI등재

4여유자유도 직렬형 로봇의 속도 타원에 대한 기하적 분석

저자 : 김성복 ( Sungbok Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 137-146 (10 pages)

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For redundant serial robots, an in-depth analysis is made on the geometric relationship among their velocity ellipsoids, which vary depending on the number of redundant inputs. Such an analysis leads to an overall grasp of how the performance of a serial robot changes across the entire output space due to the introduction of redundancy. First, the velocity ellipsoid of a redundant serial robot is obtained as the range of outputs, mapped from the unit sphere in the input space, and the geometric shape of the velocity ellipsoid is fully described. Second, the condition for which contact occurs among the velocity ellipsoids is derived from redundant inputs. The inclusion relationship among the velocity ellipsoids is systematically identified based on the conversion of the input space constraints into the output space constraints. Third, the case study of two and three DOF serial robots is presented with the simulation results to illustrate the inclusion relationship among the velocity ellipsoids of redundant serial robots.

KCI등재

5전기차 충·방전 모델링을 이용한 V2G 부하 평가

저자 : 김무현 ( Moo-hyun Kim ) , 성백섭 ( Back-sub Sung ) , 최상봉 ( Sang-bong Choi )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 147-152 (6 pages)

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This paper presented a method for evaluating V2G load curves by using the charging and discharging locations of electric vehicles to evaluate the impact of loads generated by the charging and discharging of electric vehicles on the power grid. Considering the estimated EVs' share, the EVs' discharge power was evaluated to reflect both the nature of the arriving vehicle in the morning and the SMP plan after establishing an assumption that the electric vehicle arrived at work in the morning and the electric vehicle arrived at home in the afternoon for each of the charging/discharging place, which is the work and home of electric vehicles in the city. After evaluating the V2G load for each charging/discharging power type for the EVs charging strategy, which takes into account both the natures of the vehicle arriving at home in the afternoon, the TOU charge system, and the characteristics of the vehicle arriving at work in the morning and the SMP charge system, it was evaluated by comparing the impact assessment on the grid by adding the existing load. The results of this paper provide an accurate understanding of the impact of EVs' charging and discharging loads on the power grid. The results should support establishing an EV charging and discharging load management program to control power grids overload with appropriate SMP and TOU charges.

KCI등재

6소형 중력식 와류터빈 C-로터 구조해석에 관한 연구

저자 : 이종배 ( Jong-Bae Lee ) , 김성환 ( Seong-hwan Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 153-159 (7 pages)

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The use of fossil fuels has caused global warming, and abnormal climates are occurring worldwide. Various studies are being conducted on wind turbine and small hydropower generation, but relatively little research is being conducted on small hydropower generation. Gravitational water vortex turbine, a small hydropower generation type, has a relatively small environmental impact compared to other renewable energy fields. This paper verifies the stability through natural frequency mode analysis and structure analysis to apply the C-rotor type design method to the gravitational water vortex turbine among the vertical axis wind turbines being newly studied in wind turbines.

KCI등재

7Forchheimer 포화항력모델을 이용한 투수성 호안의 해수교환량 모의

저자 : 최지웅 ( Ji-woong Choi ) , 위현철 ( Hyun-chul Wi ) , 김대근 ( Dae-geun Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 161-166 (6 pages)

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In this study, FLOW-3D's Forchheimer's saturation drag model was used to physically reproduce the flow of infiltrating water in the body of the permeable seawall. This study confirmed that Forchheimer's saturation drag model could be applied to the permeability evaluation of the sea wall. The flow patterns in the body were compared between the temporary seawall constructed using only rubble stones and the back reinforced seawall in which the back part of the seawall was reinforced with filter rocks and mats. The flow patterns in the temporary seawall body were well-reproduced, in which the infiltration water moves from the open sea to the inside, and the flow accelerates as the stream tube shrinks. In the back-reinforced seawall, the flow pattern in which the seepage line of the body rises compared to the temporary seawall is well-reproduced due to the low permeability of the filter mat. When the simulated results of the inland tide surrounded by the seawall were compared with the observation data, the simulated and observed values showed a slight difference within 0.3m. At the T5 point, seawater exchange through the seawall was relatively as large as the temporary seawall installed. The simulation results reproduced the phenomenon that the tidal wave occurred smaller than the T5 point because the seawater exchange rate through the seawall was relatively low at the T6 point. After all, the back-reinforced seawall was smaller. In addition, it reproduced the observation data in which the tide was delayed, and the duration of the ebb tide was superior to that of the flood tide.

KCI등재

8울라스토나이트 코팅에 의한 지르코니아 기판의 표면 개질

저자 : 고재은 ( Jaeeun Go ) , 박현정 ( Hyunjung Park ) , 이종국 ( Jong Kook Lee )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 3호 발행 연도 : 2021 페이지 : pp. 167-172 (6 pages)

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All-ceramic zirconia implant has significant attention as a substitute for titanium implant because of its excellent aesthetic properties and biocompatibility, but it requires improved bioinertness and surface smoothness. This study attempted to improve the bioactivity and surface roughness of zirconia substrate by bioactive wollastonite coating. A continuous process for slurry preparation, spin coating, and post-sintering was used to modify porous zirconia substrate and controlled the repeated coating times and chemical composition. Wollastonite slurry for coating controlled the solid loading, pH, and dispersant to adjust the slurry viscosity. A dense coating layer was obtained by slurry coating and post-sintering processes. The coated layer's microstructural evolution, phase composition, and surface roughness were observed by SEM and XRD investigation, indicating that the coated layer's physical and biological properties depended on the slurry condition and coating times. The coating surface had good bioactivity compared with pure zirconia substrate, indicating that slurry coating of wollastonite was available to enhance the bioactivity of bioinert-zirconia substrate.

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KCI등재

1신뢰적 공인전자문서 소통을 위한 Document-HTML 시스템의 설계 및 구현

저자 : 황현천 ( Hyun-Cheon Hwang ) , 김우제 ( Woo-Je Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 61-73 (13 pages)

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Electronic documents have become essential for communication in the digital era rather than paper documents. An electronic document, such as a PDF document that has the same layout as a paper document, is delivered through a delivery channel such as e-mail. Moreover, in the mobile era, delivering an HTML document to a mobile application has become a means of communication. However, unlike a PDF document, an HTML document is composed of related external resource files such as an image. There is no explicit specification to guarantee the content integrity against unauthorized content modification. In this study research was conducted into Document-HTML specifications that guarantee document integrity like a PDF document and provide a better customer experience in the mobile environment based on HTML5. Furthermore, we designed and implemented a Document-HTML system in a cloud computing environment. The Document-HTML system provides stateless REST API for Document-HTML document creation and validation, and the Document-HTML document provides RSA cryptography level content integrity by using a digital signature based on PKI. The Document-HTML system can be used as a secure customer communication platform in enterprises to provide content integrity and a better user experience in the mobile environment.

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2저 헤드 자유 소용돌이 방사형 중력와류 터빈 오리피스 분지 연구

저자 : 이종배 ( Jong-Bae Lee ) , 이태원 ( Tae-won Lee )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 75-81 (7 pages)

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Gravity vortex turbines are ultra-low-head free vortex gravitational vortex turbines that use a vortex to generate electricity in ordinary streams. Although research is limited in Korea, much research is being carried out in Europe and Southeast Asia. The turbine is capable of generating power with a low cowpox of 0.7 to 2 meters and consists of orifice branches, blades, gear boxes, generators, and power equipment. Double orifice basins play an important role in producing vortexes in flowing water. Important variables for generating electricity in orifice basins are the flow rate, inlet size, output direct cost drop-off conditions compared with input, and installation conditions. The purpose of this study is to verify the vortex stability of the orifice basin and to secure future orifice basin product modeling and data. The study found that the safety margin was interpreted as frame "128.4", flange "137.3", and water tank "7.8". Based on this study, gravity currents are safe on land and are the basis for continuous research on how to utilize orifice basins underground.

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3양자우물구조 유기발광다이오드에서 공진터널링현상에 의한 휘도효율 개선의 관찰

저자 : 장원근 ( Won Gun Jang ) , 최범호 ( Bum Ho Choi ) , 이창훈 ( Chang Hoon Lee )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 83-88 (6 pages)

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In this study, a synchronized appearance of resonant tunneling and luminance is reported in quantum well-structured organic light-emitting diodes (OLEDs) when the tris 8-hydroxyquinolinato aluminium (Alq3, 30 nm) and metal-free phthalocyanine (H2Pc, 5 nm) layers are employed as green and blue emission layers, respectively. The current density (J)-voltage (V) characteristic showed "peak and valley" between 14.6 and 16 V with a ratio of 4.5, which is clear evidence of the resonant tunneling phenomenon. The luminance (L)-voltage (V) characteristic also showed synchronized behavior with the resonant type of the J-V characteristic. On the other hand, the "peak and valley" characteristic was not observed when the thickness of H2Pc was thicker than 5 nm, which means no resonant tunneling took place. In conclusion, we were successful in showing improved luminance efficiency in quantum well-structured organic light-emitting diodes (OLEDs) by the resonant tunneling phenomenon.

KCI등재

4질산알루미늄9수화물 전구체와 공업용 펄프를 함침매트릭스로 사용한 알루미나(α-Al2O3) 나노입자의 합성

저자 : 김수종 ( Soo-jong Kim )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 89-93 (5 pages)

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Aluminium oxide(α-Al2O3;α-alumina) nanoparticles were synthesized by liquid phase precursor process using Al(NO3)3·9H2O as the aluminium oxide precursor. Industrial pulp was used as an impregnation matrix. The synthesized powders were characterized by XRD and FE-SEM. The particle size of the powders was controlled by heat treatment conditions, such as heating temperature and time. Al2O3 nanoparticles were created when the heat treatment temperature was raised to 1,100℃. XRD diffraction analysis confirmed that the crystalline phase of alumina produced at 1,100℃ was α-Al2O3. Results from SEM showed that the generated powder consisted of a collection of particles, and that the size of the primary particles of the specimen at 1,100℃ was less than 100 nm. Secondary particles were observed to change their cohesion form as temperatures increased, and the size of the collection decreased.

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5생물안전 3등급 연구시설 차압 제어 개선 방안에 관한 연구

저자 : 우재민 ( Jae-Min Woo ) , 빈상도 ( Sang-Do Bin ) , 손영득 ( Yung-deug Son )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 95-100 (6 pages)

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Research to prevent the spread of infectious diseases has become active recently in Korea, and the healthcare industry is growing in importance. Biosafety research facilities require air conditioning equipment that controls the flow of air artificially to prevent infectious agents from leaking out and affecting humans. Two methods for air conditioning systems, the CAV method and the VAV method, are both currently used in biosafety research facilities. In this study, we tried to identify the problems of the two air conditioning control methods and establish a system that can operate safely by generating pressure variables in a laboratory of a biosafety research facility operating the two air conditioning systems. Also a plan for improvements is suggested.

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6효소활성재를 이용한 음식물류 폐기물처리 공정 특성

저자 : 이행연 ( Haeng Ryun Lee ) , 황규홍 ( Kyu Hong Hwang ) , 이종국 ( Jong Kook Lee )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 101-106 (6 pages)

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To improve the extinction process of food waste enzymatic activity material derived from the selected microorganisms such as Bacillus were adapted and their functions to remove organic matters, bad smells and salts in food waste were studied. First of all the specific microscopic organism in soil such as radiation germ, yeast, and etc. were revitalized and set in sawdust so that the enzymatic activity came to appear. To identify the effect of processing of food waste treatment by enzymatic activity material, the amount of fermenter produced was checked and the reaction temperature, aeration periods, pH were measured. As a result, little change was occurred in pH, but approximately 20% change was shown in temperature and aeration periods. The decomposition of food waste by direct input of microorganism only should keep pH neutral mostly, and reaction temperature of as high as 60℃ was necessary for treating the food waste effectively. However, in case of using enzymatic activity materials, the decomposition of food waste achieved with a good condition even in pH 4~9, and as low temperature of 35℃. Especially, only 30% of injection of aeration can make decomposition efficiently so that the expenses of food waste handling would be reduced. To decrease the bad smell of food waste, mixing and stirring the food waste was adapted and hydrogen sulfide was decreased from 30 mg/L to 1 mg/L dramatically. As a result enzymatic activity material shows good ability to contribute the effective disposal and odor removing of food waste.

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7전처리 방법이 감압후라이드 고구마칩의 물리적 특성에 미치는 영향

저자 : 김다송 ( Da-song Kim ) , 신현재 ( Hyun-jae Shin )

발행기관 : 조선대학교 공학기술연구원 간행물 : 공학기술논문지 14권 2호 발행 연도 : 2021 페이지 : pp. 107-113 (7 pages)

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Recently, the demand for healthy snacks from domestic agricultural products is increasing with the recent well-being trends. For vacuum frying, the frying temperature and oxygen concentration are low, so the oxidation reactions of oil are significantly reduced compared to deep frying. Therefore, vacuum-fried products are suitable for healthy food manufacturing due to their low content of harmful ingredients such as trans fats, polar compounds, and acrylamide. The vacuum-fried chips show different physical properties compared to deep-fried one with pretreatment methods, and product quality of the snack is strongly dependent on physical properties. In this study, sweet potatoes and purple sweet potatoes were investigated with various pretreatments to measure their physical properties. The pretreatment methods used were predrying, blanching, osmotic dehydration, antibrowning agent and hydrocolloid coating. The physical properties of vacuum-fried chips were measured for yield, color, oil content, and hardness. As a result, changes in physical properties were evident according to the pretreatment method. Product yield and oil content are important factors for producers and consumers, and considering this, the best pretreatment method was osmotic dehydration. The results could be used to produce premium-grade sweet potatoes and purple sweet potatoes chips based agricultural products with high palatability and low acrylamide contents.

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