Biological efficiency (BE), the ratio of fresh mushrooms harvested per dry substrate weight, expressed as the percentage of Lentinula edodes, also known as shiitake, was determined using the ‘Sanjo 701’ strain stored in the Department of Mushroom at the Korea National College of Agriculture and Fisheries. The mycelia were grown in glass columns with varying levels of moisture content and varying mixing periods of 0.5, 1, 2, and 3 hours. The substrate was sterilized using a steam pressure autoclave sterilizer at normal and high pressure to avoid contamination. The results showed that mycelial growth (126 mm/15 days) was optimized at 55% moisture content. The best mycelial growth of 117 mm/15 days was obtained with 2 hours of mixing time. Normal pressure sterilization yielded better results with mycelial growth of 96 mm/15 days at 100°C compared to 88 mm /15 days with sterilization at 121°C. Mycelial density was higher, i.e. 3(+++), with normal pressure sterilization compared to 2(++) with high pressure sterilization. Furthermore, sawdust mixed with 5% woodchips increased the substrate porosity and yielded higher mycelial growth. Thus, we demonstrated that the optimum harvest or potential increased yield of shiitake can be obtained by modulating moisture content, mixing time, and substrate porosity.

Background:After a stroke, the control of the trunk muscle may be severely impaired. Due to the importance of trunk control in complex daily postures, the ability to adopt a correct sitting posture is considered a determinant of the recovery of independent function after a stroke.Objects:The purposes of this study were to compare differences in buttock pressure between the left and right sides of hemiplegic patients and differences in their pelvic tilting angles (sagittal and coronal planes) after sitting training with visual biofeedback (VBF) in real time.Methods:Twenty-two individuals with unilateral strokes (11 left-side and 11 right-side hemiplegic stroke patients) participated in this study. Buttock pressure was measured using a pressure mat, and pelvic angles were measured using a palpation meter.Results:The asymmetry of pressure between the right and left (first and third chamber) sides was significantly decreased after the VBF training. The measurements obtained using the palpation meter revealed a significant decrease in the pelvic angles pre- versus post-intervention.Conclusion:VBF training may be distribute a patient’s buttock pressure equally while in a sitting posture and increase the length of time a stroke patient can maintain a symmetrical sitting posture. It can also improve pelvic control while sitting in a neutral position.

Pressure monitoring is expected to be expanded in a water distribution system according to accelerated development of smart water network management technologies caused by appearances of affordable digital infrastructures like computing, storage and bandwidth. However, the placement of pressure sensors has been determined by engineer’s technical decisions since there is no well-defined criteria for deciding a suitable location of pressure sensor. This study presents a placement method of pressure sensors based on the consideration of allowable error in calibrating water network analysis modeling. The proposed method is to find a minimum set of pressure sensors for achieving a reliable management of water transmissions main and increasing the efficiency of their real-time operation. In the case study in Y area’s transmission main, the proposed method shows equally distributed pressure sensors in terms of hydraulics. It is expected that the proposed method can be used to manage transmission mains stably and construct a robust real-time network analysis system as a minimal criteria.

Pay-What-You-Want (PWYW) is an innovative participative pricing strategy in which consumers determine the price they want to pay for a product or service. Past research mainly focuses on individual variables as antecedents of consumers’ willingness to pay under PWYW pricing and ignores the role of situational factors. We address this gap by investigating the effects of three situational factors, perceived crowding, involvement level and time pressure, on consumers’ PWYW pricing decisions. Pay-what-you-want (PWYW) is an innovative pricing mechanism that gives consumers maximum control over the price setting process, and thus allows buyers to entirely determine the price for their desired product or service (Schmidt, Spann & Zeithammer, 2014). The buyer has the authority to choose any price to pay for the offered product or service and there is no minimum price to protect the seller (Kahsay & Samahita, 2015). Such increased perceived control on the final price induces consumers to greater purchase intentions (Chandran & Morwitz, 2005). Hence, a growing number of firms in different industries such as music, museums, software, and charity sales are using PWYW pricing (Schmidt, Spann & Zeithammer, 2014). Internal reference price (IRP) is defined as a price in the buyers' memories that serves as a basis for judging or comparing actual prices (Monroe, 1973; Monroe, Grewal, & Compeau, 1991). In the context of PWYW involvement has a negative effect on prices paid. Involvement is the level of personal relevance consumers possess regarding a product or a purchase decision (Zaichkowsky, 1985). Involvement is conceptualized as both, an individual difference variable representing an “enduring interest” in a given product (Roy, 2015; Bloch & Richins, 1983). It is also posited that the negative effect of involvement on IRP will be further moderated by perceived crowding. Perceived crowding is often described in negative terms as a confined, constrained, and restricted physical setting; and it has two distinct dimensions, spatial crowding and human crowding (Machleit et al., 2000; Byunn & Mann, 2011). A crowded shopping environment is also incompatible with the consumers’ shopping desires and goals; hence consumers exhibit unfavorable shopping behavior such as spend less time in the store (Machleit et al., 2000; Li, Kim & Lee, 2009). Perceived crowding should therefore negatively influence consumers’ involvement and IRP, thereby affecting the money they are willing to pay in PWYW situation.

Background and Purpose of Study: Social commerce refers to a form of electronic commerce based on Social Networking Service (SNS) and has grown substantially since the advent of Groupon in 2008. The growth of social commerce was accelerated with the increased popularity of SNS, where consumers share product information and reviews and the information is spread to others through SNS in real time (KB financial group, 2015). Social commerce can be divided into three types: (1) online group buying, (2) online shopping linked with the SNS, and (3) online shopping in SNS. The first type of social commerce is the most common type in Korea and the current study conducted an experiment based on the online group buying format. In the group buying social commerce, consumers gather together to purchase a product with a cheaper price. Placing a large order facilitates price promotion, (Yuan, & Lin, 2004) and buyers benefit from the cheaper price through the group buying (Zeng, Huang, & Dou, 2009). Group buying websites provides consumers with two types of information: time left for the promotion (time pressure) and the number of product sold (product popularity), and the overall purpose of this study is to examine the effects of time pressure, product popularity and website reputation on purchase intention. Hypotheses Development: Consumers make a purchase on social commerce websites because they can get a product with a cheaper price through group buying. Thus, this study is based on the assumption that all products are under price promotion. According to prospect theory, consumers are more likely to be sensitive to losses than gains. Consumers initially perceive a price promotion as a potential gain, but as the expiration approaches, they are more likely to perceive the promotion as a potential loss, which consequently increase purchase intention (Inman & McAlister, 1994). Also, a statement indicating product popularity, such as ‘the best-selling item’ increases purchase intention (Jeong & Kwon, 2012). Signaling theory provides a useful insight into understanding the effects of website reputation. Since consumers use a website reputation as an indicator of quality (Kirmani & Rao, 2000), they generally respond more positively to well-known websites than unknown websites (Shamdasani, Stanaland, & Tan, 2001). Therefore, based on the literature review, the following hypotheses are developed.H1: High time pressure has a greater impact on purchase intention than low time pressure. H2: High product popularity has a greater impact on purchase intention than low product popularity. H3: Well-known website has a greater impact on purchase intention than unknown website. H4: The effect of time pressure on purchase intention differs as a function of product popularity. H5: The effect of time pressure on purchase intention differs as a function of website reputation. H6: The effect of product popularity on purchase intention differs as a function of website reputation. Method: This study’s design is a 2 (time pressure: high vs. low) x 2 (popularity: high vs. low) x 2 (website reputation: well-known vs. unknown) between-subjects factorial design. This study includes three pretests: (1) to select high versus low time pressure, (2) to select the number of product purchased (product popularity), and (3) to select well-known and unknown social commerce websites. Based on the results of the pretests, eight mock websites simulating social commerce websites were developed for the main experiment. The data were collected via a research company. Invitation emails with a URL were sent to potential participants, and they were guided to shop the website and answer the questionnaire. The measure of purchase intention was adopted from the existing literature with adequate reliabilities (Cronbach’s alpha >.70), and the scale items used a 7-point scale. Manipulation checks showed that manipulations of time pressure, product popularity, and website reputation were successful. Results: A total of 453 female online shoppers participated in the online experiment. An exploratory factor analysis revealed one factor of purchase intention, and the reliability.93, indicating adequate internal consistency of the scale. Hypotheses were tested using analysis of variance (ANOVA). The results showed main effects for product popularity [F (1, 445) = 10.34, p < .05] and website reputation [F (1, 445) = 72.03, p < .05] on purchase intention, supporting H2 and H3. With regard to H4 to H6 predicting interaction effects, ANOVAs showed significant interaction effects of time pressure by product popularity [F (1, 445) = 5.53, p < .05], time pressure and website reputation [F (1, 445) = 4.59, p < .05], and product popularity and website reputation [F (1, 445) = 9.15, p < .05] on purchase intention. Thus, H4 to H6 were supported. Conclusions and Discussion: The study offers academic and managerial implications. The findings of the study provide empirical support for the signaling theory and prospect theory. The results suggest that high popularity and high reputation are significant factors influencing purchase intention. When consumers perceive a product as being popular on a social commerce website, they have greater purchase intention than when they do not perceive the product popularity. Also, when consumers shop on a well-known social commerce website, they have greater purchase intention than when they shop on an unknown website. When the product popularity is high, high time pressure is an important factor enhancing purchase intention. When a website is well-known, high time pressure increased purchase intention. However, when a website is unknown, high product popularity increased purchase intention. These findings of the study contribute to the literature in social commerce. Based on the website reputation, social commerce websites need to incorporate appropriate marketing tactics, such as time pressure and product popularity to increase consumers’ purchase intention.

목 적: 1일 착용용 소프트 콘택트렌즈의 가파르게 처방된 정도에 따른 각막굴절력의 변화, 눈물막 파괴 시간의 변화, 안압의 변화와 상관관계를 알아보고자 하였다. 방 법: 대학생 24명(48안)을 대상으로 1일착용 렌즈를 8시간 착용시켜 8시간 경과 후 렌즈를 제거하고 각막굴절력, 눈물막 파괴시간 그리고 안압 측정을 시행하여 콘택트렌즈 착용전과 비교하였다. 결 과: 가파른 피팅을 함에 따라 각막굴절력은 +0.29±0.06 D 증가(t=-12.62, p<0.05)하였으며, 눈물 띠 파괴시간(TBUT)은 –1.26±2.02sec 감소(t=5.04, p<0.05)하였으며 안압은 –2.19±2.15mmHg 감소 (t=6.4, p<0.05)하였다. 가파른 피팅 정도에 따른 각막의 굴절력과의 상관관계(r=-0.98)는 강한 음의 상관 관계를 가졌으며. TBUT와의 상관관계(r=-0.26)는 약한 음의 상관관계를 가졌으나 안압(r=-0.07)과는 상관 관계가 없었다. 결 론: 각막의 곡률반경에 비하여 소프트 콘택트렌즈의 곡률반경이 0.3mm 이상 가파른 피팅되어 8시 간 착용했을 때, 각막굴절력의 변화에 대한 강한 상관관계가 있으므로 소프트 콘택트렌즈 처방 시 가파른 피 팅이 되지 않도록 유의해야 한다.

The purpose of the current study was to explore the effects of background knowledge, time pressure, and involvement on reading comprehension. One hundred and twenty college students read three passages and answered comprehension questions in eight different experimental conditions: activated vs inactivated background knowledge, with vs without time pressure, and high vs low involvement. The results showed main effects of background knowledge and involvement on reading comprehension, indicating essential roles of background knowledge in facilitating the processes of reading comprehension in Korea’s EFL educational contexts. In addition, the study found an interaction effect of background knowledge and time pressure on reading comprehension. Pedagogical implications are suggested.

본 연구는 시간압력이 주어진 상황에서 개인의 고유한 인지특성인 인지양식과 과제의 난이도에 따른 학습맥락이 시각변별과제의 기술습득과 전이에 어떠한 영향을 주는지 알아보고자 하였다. 자극은 다각형 비교과제를 이용하였으며, 실험은 스크린 세션, 훈련 세션 그리고 전이 세션으로 구성되었다. 스크린 세션에서는 참가자를 인지양식(분석적-전체적)에 따라 구분하였으며, 훈련 세션에서는 학습맥락의 구분을 위해 과제의 난이도를 어려운 조건과 쉬운 조건으로 나누었다. 전이 세션에서는 모든 피험자가 새로운 난이도의 다각형을 비교하였다. 훈련 세션과 전이 세션에서는 시간압력의 효과를 보기 위해, 1.5초가 지나면 자극이 사라지게 하였다. 전 세션에 걸쳐 정확도와 반응시간을 측정하였다 실험결과, 분석적 처리자는 훈련 세션 동안 전체적 처리자와 같은 수준의 빠른 반응을 보이나, 훈련이 지속될수록 반응시간의 기울기가 증가하였다. 이러한 결과는 분석적 처리자가 자극의 세부특징들을 일 대 일로 비교하는 원래의 처리스타일로 회귀했음을 의미한다. 반면, 분석적 처리를 유도하는 어려운 학습맥락에서 훈련한 전체적 처리자의 경우, 전이 세션의 초기블록에서 반응시간의 증가를 보였다. 이것은 전체적 처리자가 어려운 학습맥락에 의해 분석적 전략을 개발했다는 것을 의미한다. 이러한 결과들을 통해 시간압력 상황에서도 개인의 인지양식의 차이가 인지전략의 개발 및 기술습득에 영향을 미치는 것을 확인할 수 있다.

Si3N4에 2wt% Al2O3와 6wt% Y2O3을 첨가한 분말을 가스압 소결 방법으로 시편을 제조하였다. 이때 소결시 시간변화에 따른 공기 중에서 마모 특성을 비교하였다. 소결 시간에 따른 마모 특성의 변화는 기계적 성질, 즉, 파괴인성 등이 영향을 주는 것으로 나타났다. 소결 시간이 길어지면 큰 elongated 입자의 과잉성장에 따라 곡강도 및 파괴인성이 낮아져 이 결과 마모가 증가되었다. 이때 나타난 결과에 의하면 공기 중에서 질화규소의 마모특성에 영향을 주는 인자는 여러 가지 기계적 특성 중에서 파괴인성 및 곡강도가 미치는 영향이 크게 나타났다.

SiH4환원에 의한 선택성 CVD-W 공정에서 증착시간과 증착압력에 따른 W막 특성의 변화를 조사하였다. 300˚C, 100mtorr이하에서 W막이 Si기판 전면에 증착되는 데에 약 30초의 시간이 걸렸고, 증착시간에 따라 막 두께는 초기에는 직선적으로, 나중에는 포물선적으로 증가하였으며, 면저항은 초기에는 급히, 나중에는 서서히 감소하는 경향을 나타내었다. 50-300mtorr의 압력범위에서 압력의 증가에 따라 결정립도(grain size)는 별로 변하지 않았으나 결정립계(grain boundary)의 윤곽이 불확실해지는 경향을 나타내었다. 또한 이 압력범위에서는 α-W만 나타날 뿐 β-W의존재는 발견되지 않았다. 증차압력의 증가에 따라 W막의 증착속도가 증가하고, 비저항도 증가하는 경향을 보였다. AES 분석결과에 의하면, 증착압력온 Si/W의 조성비나 W/Si계면에서의 실리사이드화에는 큰 영향을 미치지 않는 것으로 나타났다.

흙-함수특성곡선(Soil-Water Characteristic Curve, SWCC)은 모관흡수력과 포화도 혹은 체적함수비 사이의 관계를 나타내어주는 불포화토 고유의 물성으로서 불포화토의 흐름특성을 이해하고 함수량에 따른 흙의 강도 및 응력 거동특성을 해석하는 데 필수적인 요소이다. 흙-함수특성곡선에 대한 선행 연구결과들의 경우, 건조 및 습윤과정에서의 간극수 유출입량을 측정하여 모관흡수력에 대한 체적함수비를 산출하여 왔다. 본 연구에서는, 압력판 추출 시험기(VPPE)에 전자기파의 시간영역반사법(Time Domain Reflectometry, TDR)을 도입하여 불포화토의 건조 및 습윤과정에 따른 유전상수 측정을 통해 체적함수비를 산정하고자 하였다. 압력판 추출 시험기는 압력셀, 압력조절장치, 뷰렛 시스템, TDR 프로브로 구성된다. 압력조절장치로 압력셀 내부에 공기압을 가하여 모관흡수력을 조절하였고, 가압범위는 0.1kPa-50kPa으로 설정하였다. 모관흡수력 변화에 따라 시료내 함수량이 변화하였으며, 뷰렛 시스템을 통하여 변화량을 측정하였다. 프로브의 경우 압력셀 내부에 설치하고, 프로브 양단에서 발생되는 전자기파의 반사 신호를 이용하여 유전율을 산정하였다. 실험결과, 전자기파의 시간영역반사법에 의해 산정된 체적함수비는 시료의 체적함수비와 높은 상관성을 나타내었다. 본 논문은 흙-함수특성곡선 연구에 시간영역반사법을 접목시켜 불포화토의 함수특성을 파악하고, 기존 방식과의 비교를 통해 함수특성곡선 결과에 대해 검증할 수 있다는 점에서 의미가 있다.

백설기의 최적 배합비(쌀가루 100%, 수분 60%, 소금 1.5%, 설탕 15%)를 선정하여 찌는 압력(0.5, 1.0, 1.5 bar)과 찌는 시란(5, 10, 15분)을 달리하여 시료를 제조 후 저장기간(0, 4, 8, 12, 24시간)에 따른 백설기의 굳기변화와 굳기속도 및 관능적 특성의 결과를 살펴보았다. 굳기는 저장기간 0시간에서 8시간은 완만하게 증가하였지만 12시간 이후에는 급격하게 증가하는 경향을 나타내었지만 찌는 압력이 1.0