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      • KCI등재

        Micronization and characterization of squid lecithin/polyethylene glycol composite using particles from gas saturated solutions (PGSS) process

        윤준호,전병수,이혜윤,A.K.M. Asaduzzaman 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2

        Lecithin was isolated from squid viscera residues after supercritical carbon dioxide (SC-CO2) extraction at 25 MPa and 45 8C. The particle formation of squid lecithin with biodegradable polymer, polyethylene glycol (PEG) was performed by PGSS using SC-CO2 in a thermostatted stirred vessel. By applying different temperatures (40 and 50 8C) and pressures (20–30 MPa), conditions were optimized. Two nozzles of different diameters (250 and 300 mm) were used for PGSS and the reaction time was 1 h. The average diameter of the particles obtained by PGSS at different conditions was about 0.74–1.62 mm. The lowest average size of lecithin particle with PEG was found by the highest SC-CO2 density conditions with the stirring speed of 400 rpm and nozzle size of 250 mm. The inclusion of lecithin in PEG was quantified by HPLC. Acid value and peroxide value was measured after micronization of lecithin.

      • KCI등재

        골프코스 서비스스케이프가 고객만족 및 재방문의도에 미치는 영향

        윤준호,이상건 한국호텔관광학회 2013 호텔관광연구 Vol.15 No.4

        The purpose of this study was to examine the effect of servicescape on customer satisfaction and revisit intention in golf resorts. Four hundreds forty-six questionnaires were utilized from the sample of 500 golf players from 10 different golf courses located in Kyonggi Province. Exploratory factor analyses identified five underlying dimensions of golf resort servicescape; external, tangible, internal, location, social. Path analysis using SEM using AMOS 18.0 was adopted to test research hypotheses. The resuts revealed that all the four underlying dimensions of golf resort servicescape except for tangible showed positive impact on general satisfaction, and external, tangile, and social factors of golf resort servicescape also showed positive impact on monetary value satisfaction. Those two satisfactions were also positively related to revisit intention of golf resort. The results of the study suggested important implications on the competiveness of golf resort.

      • KCI등재

        Toxicity and Repellent Activity of Plant Essential Oils and Their Blending Effects Against Two Spotted Spider Mites, Tetranychus urticae Koch

        윤준호,탁준형,Yoon, Junho,Tak, Jun-Hyung Korean Society of Applied Entomology 2018 한국응용곤충학회지 Vol.57 No.3

        Miticidal and repellent activity of twenty plant essential oils against the adults of two spotted spider mites, Tetranychus urticae, were examined. Sandal wood oil was the most potent one in mortality, whereas clary sage oil exhibited the greatest repellent activity. On those twenty essential oils tested, no apparent correlation between toxicity and repellency was observed. When the most active oils were blended, the combinations tend to exhibit antagonistic interactions in both toxicity and repellent activity. The chemical compositions of sandal wood oil and clary sage oil were identified via GC/MS analyses, and the major constituents of sandal wood oils were sesquiterpene compounds, whereas the major ones for clary sage oil were monoterpenes. Among the major components in clary sage oil, linalyl acetate was not only the most abundant constituent, but also the most responsible one for its repellent activity. 본 연구에서는, 20종의 식물정유를 이용하여 점박이응애 성충에 대한 살비활성 및 기피활성을 확인하였다. 살비활성 평가에서는 샌달우드 오일이, 기피활성 평가에서는 클라리 세이지 오일이 가장 높은 효과를 나타내었고, 평가에 사용한 20종의 식물정유간에는 살비활성과 기피활성간의 상관관계가 매우 낮게 나타났다. 높은 활성을 나타낸 정유들의 혼합시험에서는, 거의 대부분의 조합이 서로간에 저해효과를 갖는 것으로 확인되었다. 샌달우드 및 클라리 세이지 오일의 구성성분은 GC/MS 분석을 통해 확인하였으며, 샌달우드는 세스퀴터펜류가, 클라리 세이지 오일은 모노터펜류가 주종을 이루었다. 클라리세이지 오일의 구성성분 중에서는 linalyl acetate가 가장 높은 함량을 갖고 있을 뿐만 아니라, 해당정유가 기피효과를 갖는 주된 효능물질임을 확인하였다.

      • KCI등재

        화력발전소의 소음분포 해석 및 방음벽 대책

        윤준호,김원진 한국음향학회 2020 韓國音響學會誌 Vol.39 No.2

        An analysis model of noise map is proposed to evaluate and reduce the acoustical noise of power plant and its surroundings. The sound powers of many noise sources are estimated by measuring the sound levels of major equipments in the power plant. The analysis of noise has been made by using ENPro that is a commercial program for environmental noise prediction. The proposed model is verified by comparing the results from noise analysis and measurement at several points of the power plant units 1 through 4, and residential areas. It is shown that noise map simulation using the proposed model has a reliability, since the overall noise level approximates within the error of ±2 dB. Furthermore, through noise analysis, the increasing effect of noise due to newly established units 5 and 6 on residential areas is also analyzed. Consequently, the noise barrier is designed to meet an environmental noise standard and satisfy low cost and safety conditions. 발전소 소음을 저감하기 위해서는 여러 가지 설비요소의 소음원에 대해 설계단계에서부터 정확한 소음예측 을 수행하고, 과도한 소음에 대해서는 효과적이고 경제적인 방음대책의 수립이 필요하다. 이에 본 논문에서는 발전소 지역 및 주변 주택지역을 포함한 소음분포 해석 가능 모델을 제안하고, 주택지역의 소음저감 방법을 수립하였다. 발전 소의 주요 소음원에 대한 소음레벨의 측정을 통하여 음향파워레벨을 평가하고, 설계도면 및 지형정보를 이용하여 소 음전달에 영향을 주는 지형 및 지물 등을 최대한 상세히 모델에 포함함으로써 발전소 및 주택 지역의 소음분포를 효과 적으로 해석할 수 있는 모델을 수립하였다. 수립된 소음 해석 모델의 신뢰성은 주요 위치에서의 소음레벨 해석 결과와 측정 결과를 비교하여 검증하였으며, 이를 바탕으로 신규호기의 증설에 의한 인근 주택지역에서의 소음 영향도를 평 가하고, 발전소의 가동 시에 소음환경기준을 만족시키는 방음벽을 제안하였다.

      • KCI등재
      • KCI등재

        무연솔더를 적용한 자동차 전장부품의 기계적 접합강도 및 오차 범위에 관한 연구

        윤준호,전유재 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.6

        This study has assessed mechanical bonding strength of lead-free solder joint. Assessment methods was performing long-term reliability test about thermal shock, thermal life and high temperature & high humidity. Based on the results of analyzing mean values that was obtained from repetion of 5 times according to each conditions, reduction of mechanical bonding strength of each tests was confirmed. When it comes to HB chip, the order of high deviation rate was shown thermal shock, high temperature & humidity and thermal life. And the higher deviation rate of R0 is high temperature & humidity, thermal life and thermal shock. The order of high deviation rate of C1 chip is high temperature & humidity, thermal shock and thermal life. Related to this result of experiment, the most stable error range of mechanical bonding strength is established. From now on optimized quantity of solder and shape of solder-joint is needed by establishing a test method which can make error range of mechanical bonding strength minimize.

      • KCI등재

        표면실장용 IC 패키지 솔더접합부의 열피로 수명 예측

        윤준호,신영의 대한용접접합학회 1998 대한용접·접합학회지 Vol.16 No.4

        Because of the low melting temperature of solder, each temperature cycle initiates an irrecoverable creep deformation at the solder interconnection which connects the package body with the PCB. The crack starts and propagates from the position where the creep deformation is maximized. This work has tried to compare and analyze the thermal fatigue life of solder interconnection which is affected by the lead material, the size of die pad, chip thickness, and interface delamination of 48-Pin TSOP under the temperature cycle ($0^{\circ}C$~1$25^{\circ}C$). The crack initiation position and thermal fatigue life which are calculated by using FEA method are well matched with the results of experiments. The thermal Fatigue life of copper lead frame is extended around 3.6 times longer than that of alloy 42 lead frame. It is maximized when the chip size is matched with the length of the lead. It tends to be extended as the thickness of chip got thinner. As the interfacial delamination between die pad and EMC is increased, the thermal fatigue life tends to decrease in the beginning of delamination, and increase after the delamination grew after 45% of the length of die pad.

      • KCI등재

        호텔창호의 물리적 특성이 고객감정에 미치는 영향

        윤준호,정경일,이상건 대한관광경영학회 2011 觀光硏究 Vol.25 No.6

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        본 연구의 목적은 대전지역의 특급호텔을 대상으로 호텔 창호의 물리적 특성과 고객감정간의 관계를 규명하는 것이다. 이와 같은 연구목적을 달성하기 위해 선행연구를 토대로 측정도구를 설정하고 실증분석을 위해 호텔이용고객을 대상으로 자료를 수집하여다. SPSS 11.5를 이용하여 빈도분석, 기술분석 요인분석 그리고 연구과제의 검증을 위해서는 정준상관분석을 실시하였다. 측정변수의 요인분석결과 호텔 창호의 물리적 특성은 기능적 특성요인과 디자인 특성요인으로 요인화하였고, 고객감정은 긍정적인 즐거움과 부정적인 지배감으로 요인화되었다. 탐색적 요인분석결과 도출된 각 각의 요인군을 독립변량 및 종속변량으로 하여 정준상관분석을 실시한 결과 호텔 창호의 기능적 특성요인과 디자인 특성요인 모두가 고객의 긍정적인 반응인 즐거움과 매우 밀접한 관계가 있다는 점이 검증되었다. 특히, 디자인 특성요인 보다는 기능적 특성요인이 상대적으로 고객의 즐거움과 밀접한 관계가 있다는 점이 검증되었다. 이런 분석결과를 토대로 호텔경영의 시사점과 연구의 한계를 결론부분에 제시하였다. The purpose of this study was to examine the relationship between physical characteristics of hotel windows and the customer's emotion. A sample of 280 surveys which showed a 93.3% usable response rate. Exploratory factor analysis was adopted to identify two underlying dimensions of physical characteristics of hotel windows: functional and design, and two underlying dimensions of the customer's emotion; pleasure and control. Canonical correlation analysis was adopted to examine the overall correlation between the two underlying factors from physical characteristics of hotel windows and the two underlying factors from customer emotion. The higher correlation was found between both physical characteristics factors and the pleasure factor of customer emotion. And the managerial implications of these results are examined.

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