• 공업화학
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• 제34권2호
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• pp.153-160
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• 2023

본 논문에서는 미이용 바이오매스로부터 바이오차를 생산하고 메틸렌블루 흡착 특성을 평가하였다. 바이오매스는 주로 셀룰로오스, 헤미셀룰로오스, 리그닌으로 구성되어 있으며 회분의 함량은 벌채부산물에서 가장 높았다. 탄화 온도가 증가할수록 탄화 수율은 감소하였으며, 수소와 산소 함량도 감소하였다. 반면, 탄소 함량은 증가하였다. 탄화 온도가 증가할수록 바이오차의 비표면적과 미세기공은 증가하였다. 바이오차 비표면적은 탄화 온도 600 ℃에서 가장 높았다(216.15~301.80 m² /g). 600 ℃에서 탄화한 바이오차를 이용하여 메틸렌블루 흡착 실험을 수행한 결과, 참나무, 벌채부산물, 사과 전정가지의 흡착 거동은 Freundlich model, 복숭아 전정가지는 Langmuir model에 적합하였다. 흡착 동역학에서 참나무와 복숭아 전정가지는 pseudo-first-order model, 벌채부산물과 사과 전정가지는 pseudo-second-order model에 적합하였다.

• Communications for Statistical Applications and Methods
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• 제5권2호
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• pp.339-351
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• 1998

Designs for discriminating between two linear regression models are studied under $\Lambda$-type optimalities maximizing the measure for the lack of fit for the designs with fixed model inadequacy. The problem of selecting an appropriate $\Lambda$-type optimalities is shown to be closely related to the estimation method. $\Lambda$-type optimalities for the least squares and minimum bias estimation methods are considered. The minimum bias designs are suggested for the designs invariant with respect to the two estimation methods. First order minimum bias designs optimal under $\Lambda$-type optimalities are then derived. Finally for the case where the lack of fit test is significant, an approach to the construction of a second order design accommodating the optimal first order minimum bias design is illustrated.

• Structural Engineering and Mechanics
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• 제28권3호
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• pp.263-280
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• 2008

Information on the distribution of the basic random variable is essential for the accurate analysis of structural reliability. The usual method for determining the distributions is to fit a candidate distribution to the histogram of available statistical data of the variable and perform approximate goodness-of-fit tests. Generally, such candidate distribution would have parameters that may be evaluated from the statistical moments of the statistical data. In the present paper, a cubic normal distribution, whose parameters are determined using the first four moments of available sample data, is investigated. A parameter table based on the first four moments, which simplifies parameter estimation, is given. The simplicity, generality, flexibility and advantages of this distribution in statistical data analysis and its significance in structural reliability evaluation are discussed. Numerical examples are presented to demonstrate these advantages.

• 생물환경조절학회지
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• 제30권1호
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• pp.65-71
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• 2021

이 연구에서는 장기간 수송을 통한 수출 시 포장 전 최종 관수 시기가 호접란의 생장, 개화, 그리고 분화의 상품성에 미치는 영향에 대해 구명하였다. 지름 11cm의 플라스틱 화분의 수태기반의 배지에 식재하여 8개월간 재배한 호접란(Palaenopsis) Sogo Yukidian 'V3' 식물체를 모의 암흑 수송(SDS)을 위한 포장 전 3.5, 7, 10일(실험 1)과 4, 6, 8, 10일(실험 2)에 최종 관수를 실시하였다. SDS를 위해 식물체를 수출용 종이상자에 포장한 후 온도 20 ± 1℃, 상대습도 70 ± 3%의 챔버에 두었고, 4주 후 상자에서 꺼낸 식물체들은 온도 23 ± 3℃의 온실에서 재배하면서 생육 및 상품 특성을 조사하였다. 수태와 바크의 혼합배지를 사용한 실험 1에서, FIT 3.5의 생존율은 FIT 7과 FIT 10에 비해 낮았으나, 개화소요일수, 개화수, 꽃대 신장률에서는 처리 간 차이가 없었다. 수태 배지를 사용한 실험 2에서는 모의 수송 후, 온실 입실 직전과 입실 후 재배 12주차에 측정한 부패엽 발생률은 FIT 6에서 가장 낮았다. 온실 입실 직전 FIT 8의 부패엽 발생률은 FIT 6와 비슷했지만 12주 후에는 상당히 증가하였다. FIT 10에서 부패엽 발생률이 가장 높았으며, FIT 4에서도 높았다. 개화 특성에서는 처리 간 차이가 적었다. 결론적으로, 호접란 분화의 4주간 암흑 수송을 통한 수출 시 포장 전 최종 관수 시기가 수출 후 생장 및 개화보다는 부패엽 발생에 영향을 미쳤으며, 포장 직전 배지의 용적수분함량을 30%로 하는 것이 적절하다고 판단되었다.

• 한국의류학회지
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• 제44권3호
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• pp.464-484
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• 2020

This study examined obese women with a BMI index over than 25 kg/㎡ in their 20s and 30s regarding the right fit for wearing a blouse. In comparison with three types of existing educational patterns, the first educational pattern experimental clothing was produced in dimensions of three study participants selected by the existing pattern to evaluate the fit suitability conducted for groups of study participants and expert groups. Experimental patterns were designed based on educational pattern C, which was the best fit as a result of the fitting evaluation. The main modification items include front bust circumference, hip circumference, back interscye, scye depth, shoulder length, blouse length, bottom line shape, upper arm circumference, wrist circumference, sleeve length and collar size. The design preferences for obese women were reflected in pattern modification; in addition, the final experimental pattern was designed by adding or subtracting margins and dimensions based on the results of the visual matching assessment by study subjects and expert groups.

• 한국의류산업학회지
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• 제17권1호
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• pp.93-101
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• 2015

This study aims to suggest the patternmaking method of men's slim-fit six-panel jacket sloper in their 30's. The researcher collected four kinds of existing slopers and carried out appearance evaluations twice. The researcher's sloper was developed by modifying and supplementing the existing sloper with high scores from the evaluations. The results are as follows: first, when comparing the four kinds of existing slopers, dimensions and patternmaking methods of 18 areas, especially width of back chest and side chest, were varied according to the existing slopers. Second, the researcher's sloper had excellent scores in the appearance evaluations such as placements of side line on the chest, waist, hip line, measurement in dimension from the center back hip line and from waist line, and appearance of neck line. Third, the suggested sloper are as follows: the ease on the chest is 10.5 cm, 8~10 cm extends for the jacket length, the measure in dimension from the back waist is 2.2 cm, dart intake at the back side is 4 cm, dart intake at the front side is 1.5~2 cm, and dart intake at the front waist is 1 cm. This suggested six-panel jacket sloper is expected to be useful for the various slim-fit jacket designs which have the side panels.

• 한국콘텐츠학회논문지
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• 제6권2호
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• pp.136-145
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• 2006

본 연구의 목적은 ERP도입의 성공요인을 조직적 요인, 환경적 요인, 정보적 요인으로 구분하였으며, 시스템 정보특성을 정보형태, 정보내용, 정보원천, 정보제공빈도로 구분하였다. 이 두 요인들의 적합성이 시스템 성과(사용자 만족도)에 미치는 영향관계를 검증해 보고자 하였다. 표본기업은 중소기업 250개사를 선정하였으며, 79부를 분석에 이용하였다. 업종은 제조업을 대상으로 하였으며 응답자의 직위 등은 고려하지 않았다. 연구결과는ERP도입의 조직적요인, 환경적요인, 정보적요인과 시스템 정보특성간의 적합성에 있어서 시스템 성과에 양(+)의 영향관계가 있는 것으로 조사되었다.

• 공학교육연구
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• 제18권3호
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• pp.3-12
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• 2015

The aim of this paper is to provide teacher awareness and the status of robot based instruction(RBI) by focusing on the school curriculum. To gather that information, we conducted a questionnaire survey composed of six items to 116 teachers who have had experiences on RBI. The questions are about the fit school year for RBI, the fit subjects for it, the possibility of applying it to regular subject, the fit students' learning levels for it, the fit learning styles for it and effective methods to apply it to regular subject teachers. The result is as follows: (1) RBI is suitable for fifth and sixth grade in elementary school and all grades in high school. (2) It is suitable for all regular subjects in all schools. (3) It is more effective for the students who have average learning level. (4) It fits into introverted students more than the other style of learners. (5) It is likely to be more effective in supporting of learning and understanding of the contents than merely assisting the teachers' instruction. (6) The teachers showed positive awareness on applying RBI to subject of creative activities. The results are significant in relation to the following two views. First, we can get the positive possibility in applying school curriculum using RBI. Second we can foresee that RBI will provide an innovative paradigm to school curriculum. In addition, the results of this paper can be used as preliminary information for developing models and programs on RBI.

• 대한치과기공학회지
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• 제42권3호
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• pp.228-233
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• 2020

Purpose: This study aimed to assess and compare the marginal fit of ceramic-based hybrid resin restoration (HYB) and zirconia restoration (ZIR) for dental computer-aided design/computer-aided manufacturing systems. Methods: A stainless steel master model was produced. The impression was first made with silicone, and then stone working models were produced. A total of twenty restorations were fabricated with two different materials: ZIR and HYB. The silicone film thickness of the marginal gap was measured using a digital microscope; digital photos were taken at a magnification of ×160, and then analyzed using a measurement software. The values of the result were evaluated with the independent-sample t-test (α=0.05). All statistical analyses were performed with a statistical software. Results: The mean values for the marginal gap was 37.14±2.96 ㎛ for HYB, compared with 40.37±5.26 ㎛ for ZIR. No significant difference was found between ZIR and HYB (p=0.107). Conclusion: As a result, the marginal fit of the restoration fabricated using the hybrid resin was better than that of the restoration fabricated using zirconia. Also, the marginal fit of all groups was below the clinical acceptable range of 120 ㎛. Thus, HYB for dental CAD/CAM system in this study is expected to be suitable for clinical use in dentistry.

• 문화기술의 융합
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• 제9권2호
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• pp.275-284
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• 2023

본 연구는 기존 선행연구가 부족했던 개인-직무적합성과 직무기반 심리적 주인의식과의 관계를 규명하고 나아가 직무기반 심리적 주인의식이 개인-직무적합성과 직무성과의 관계를 매개한다는 결과를 국내에서 최초로 확인한 것에 학문적 의의가 있다. 이와 더불어 능력적합이 직무성과에 미친다는 기대이론과 요구적합이 직무성과에 미치는 사회교환이론을 뒷받침해주는데도 연구의 의의가 있다고 할 수 있다. 또한 기업의 인적자원관리 부서에게는 인적자원 선발시 직무에 적합한 인재를 선발하는 것에 대한 중요성을 다시 한번 확인 시키고, 조직구성원들의 능력적합이 요구적합보다 더 큰 효과를 미치는 것을 감안하면 자기 능력에 맞는 직무에 배치하는 것이 정신적, 물질적 보상보다 더 높은 직무성과를 낼 수 있다는 점이 인적자원관리에 대한 실무적인 시사점이라고 할 수 있다.