This study aims to examine whether social support has a mediating effect on the relationship between optimism and learning flow as a strategy to promote learning flow in nursing students. The subjects of the study were first-, second-, third-, and fourth year students enrolled in the department of nursing at a four-year university located in city G. Data collection was conducted from September to October 2024. The data were analyzed using descriptive statistics, Pearson correlation coefficient, and Baron and Kenny's regression analysis. The results of the correlation analysis between the variables in this study are as follows. Optimism and social support (r=.372, p<.001), social support and learning flow (r=.445, p<.001), and optimism and learning flow (r=.437, p<.001) all showed positive correlations. The results of the mediating effect of social support on the relationship between optimism and learning flow according to Baron and Kenny's regression analysis are as follows. In step 1, optimism showed a positive effect on social support (β=.372. p<.001). In step 2, optimism showed a positive effect on learning flow (β=.437. p<.001). In step 3, social support showed a partial mediating effect between optimism and learning flow (β=.315. p<.001, β=.328. p<.001). Overall, these findings suggest that strategies that promote optimism and social support are needed to enhance learning flow among nursing students.

This study examined the feeding behavior and growth performance of 31 Hanwoo steers (10 months old; 278 ± 36.13 kg) within a precision livestock farming system using Roughage Intake Control (RIC) units for real-time data collection. Feeding behavior traits were derived from RIC database data using R software, with subsequent analysis conducted using SAS software. The results indicated that the steers visited the feed stations every 31.12 ± 11.99 minutes, averaging 11 ± 3.37 visits/day. Each feeding session lasted an average of 5.90 ± 1.55 minutes, resulting in a feed intake rate of 77.98 ± 22.53 g/min. Mean daily feed intake was 4.76 ± 1.36 kg, and body weight increased consistently, reaching an average of 412 ± 43.44 kg, with an average daily gain (ADG) of 1.26 ± 0.38 kg. Pearson correlation analysis revealed a strong relationship between daily feed intake and visit duration (r² = 0.621; p < 0.01) and an inverse correlation between daily feed intake and feed intake duration (r² = −0.445; p < 0.05), indicating behavioral adaptation. These findings highlight the importance of monitoring feeding behavior traits concerning growth performance, enhancing our understanding of individual animal behavior and its implications for productivity while emphasizing the role of advanced technologies in optimizing feed utilization in confined livestock systems.

Carbon dots (CDs) are versatile nanomaterials with tunable luminescent properties. We used a natural plant kaempferol as a carbon source to synthesize multicolor CDs by reacting it with various nitrogen sources. Blue, green, and red CDs (B-CDs, G-CDs, and R-CDs) with emission wavelengths of 445 nm, 510 nm, and 600 nm respectively were successfully synthesized. Their photoluminescence quantum yields of are up to 37.4%, 20.1%, and 30.8%, respectively. Surface analysis revealed abundant nitrogen groups influencing luminescence. B-CDs and G-CDs show excitation-dependent emissions, indicating a potential correlation between their luminescence and particle sizes, while R-CDs exhibit excitation-independent emission, suggesting they belong to molecular state CDs. All three CDs exhibit stable luminescent performance, as well as good salt resistance and photobleaching resistance. The practical application of multicolored CDs in anti-counterfeiting fluorescent inks was further explored. This work offers a straightforward, eco-friendly route to synthesize multicolor CDs.

In this investigation, we synthesized a novel quaternary nanocomposite, denoted as RGO-Ba(OH)2/CeO2/TiO2, through a straightforward and cost-effective solid-state synthesis approach. The as-prepared composites underwent a series of comprehensive characterizations, including XRD, FTIR, TGA-DTA, XPS, SEM, EDAX, and TEM analyses, affirming the successful synthesis of a quaternary nanocomposite with well-interconnected nanoparticles, nanorods, and sheet-like structures. Further, our electrochemical performance evaluations demonstrated that the electrochemical capacitance of the RGO-Ba(OH)2/CeO2/ TiO2 nanocomposite achieved an impressive value of 445 F g− 1 at a current density of 1.0 A g− 1, particularly when the mass ratio of CeO2 and TiO2 was maintained at 90:10. Furthermore, the specific capacitance retained a remarkable 65% even after 2000 cycles at a current density of 6 A g− 1 in a 3 mol KOH electrolyte. Comparatively, this outstanding electrochemical performance of the RGO-Ba(OH)2/CeO2/TiO2 (90:10) nanocomposite can be attributed to several factors. These include the favorable electrical conductivity and large specific surface area provided by graphene, TiO2, and Ba(OH)2, the enhanced energy density and extended cycle life resulting from the presence of CeO2, and the synergistic contributions among all four components. Therefore, the RGO-Ba(OH)2/CeO2/TiO2 nanocomposite emerges as a highly promising electrode material for supercapacitors.

This study utilized the unified theory of acceptance and use of technology 2 (UTAUT2) to examine usage intentions associated with virtual fitting services. Six independent variables were examined: performance expectancy, effort expectancy, social influence, facilitating conditions, hedonic motivation, and habit. The study collected responses from 445 participants who had utilized virtual fitting services. Regarding factors related to usage intentions associated with these services, performance expectancy and social influence were found to significantly influence the usage intentions associated with photo-based virtual fitting services. Furthermore, performance expectancy, social influence, and habit significantly influenced the usage intention of avatar-based virtual fitting services. This suggests that higher levels of performance expectancy and social influence positively impact the usage intentions associated with both types of virtual fitting services, while habit influences only avatar-based virtual fitting services. Moreover, the findings confirm that effort expectancy, facilitating conditions, and hedonic motivation from UTAUT2 do not significantly influence usage intentions associated with virtual fitting services. By analyzing factors influencing potential customers’ virtual fitting service usage intentions, this study can suggest effective strategies to increase usage intentions for companies providing virtual fitting services. Additionally, these findings can be utilized in the formulation of virtual fitting service marketing strategies.

The oyster mushroom is a widely cultivated edible mushroom in Korea. It is a regionally specialized crop in Gyeonggi-do, where 68% of the national production is produced. The present study was conducted to develop a new, highquality cultivar with stable cultivation. ‘Manseon’ is a new variety of oyster mushroom suitable for bottle culture. It was produced by mating monokaryons isolated from ‘HB-18’ and ‘P15159-16’. The optimal temperature for ‘Manseon’ mycelial growth was 26–29 °C on potato dextrose agar (PDA) medium and for primordia formation and the growth of fruit bodies the optimal temperature was 18–19 °C on sawdust medium. Spawn running required 30 d, primordia formation required 4 d, and fruit body growth in the bottle culture required 4 d. Regarding the characteristics of the fruit bodies, the pilei were round and dark grayish brown, stipe color was white, and stipe shape was short and thick. The yield per bottle was 192.7 g/1,100 cc, which was 9% higher than that of the control strain (Suhan-1ho). The physical properties of springiness, cohesiveness, gumminess, and brittleness of stipe tissue were 87.9%, 77.4%, 445.1 kgf, and 389.6 kgf, respectively.

This research studied the electrical characteristics, IR transmission characteristics, stealth functions, and thermal characteristics of infrared thermal-imaging cameras of copper-sputtered samples. Nylon samples were prepared for each density as a base material for copper-sputtering treatment. Copper-sputtered NFi, NM1, NM2, NM3, NM4, and NM5, showed electrical resistance of 0.8, 445.7, 80.7, 29.7, 0.3, and 2.2 Ω, respectively, all of which are very low values; for the mesh sample, the lower the density, the lower the electrical resistance. Measuring the IR transmittance showed that the infrared transmittance of the copper-sputtered samples was significantly reduced compared to the untreated sample. Compared to the untreated samples, the transmittance went from 92.0–64.1%. When copper sputtered surface was directed to the IR irradiator, the IR transmittance went from 73.5 to 43.8%. As the density of the sample increased, the transmittance tended to decreased. After the infrared thermal imaging, the absolute values of △R, △G, and △B of the copper phase increased from 2 to 167, 98 to 192, and 7 to 118, respectively, and the closer the density of the sample (NM5→NFi), the larger the absolute value. This proves that the dense copper phase-up sample has a stealth effect on the infrared thermal imaging camera. It is believed that the copper-sputtered nylon samples produced in this study have applications in multifunctional uniforms, bio-signal detection sensors, stage costumes, etc.

This study was conducted to investigate the flora of Mt. Seongdeok (Ganghwa-gun) in Korea. From the results of nine field surveys from March 2020 to July 2022, a total of 445 total taxa, representing 397 species, nine subspecies, 35 varieties, two forms and two hybrids were identified, which were placed in 273 genera and 93 families. The plant formation of Mt. Seongdeok is a deciduous broad-leaved and conifer mixed forest, which is common in the middle part of the Korean Peninsula. Most of the mountain is covered by a young secondary forest, which is mainly composed of Quercus ssp. and Pinus ssp. Among them, five taxa were endemic to Korea, one taxon were endangered plant and two taxa were red list plants. The floristic target plants amounted to 27 taxa, specifically one taxon of grade V, four taxa of grade III, seven taxa of grade II, and 15 taxa of grade I. And 43 taxa were northern lineage plants. A total of 46 species of alien plants were identified, with a Naturalized Index of 10.3%, an Urbanization Index of 11.7%, and six plants that disturbed the ecosystem. Our results provide basic data on vascular plants flora, and plant diversity and distributional changes.

Background/Aim: The aim of this study was to compare clinical features of hypertriglyceridemia-induced acute pancreatitis (HTGAP) with those of biliary acute pancreatitis (BAP) and alcoholic acute pancreatitis (AAP), respectively. Methods: Medical records of patients with acute pancreatitis (AP) who were admitted to our institution from January 2014 to December 2018 were retrospectively reviewed. Disease severity and local complications were evaluated according to the 2012 Revised Atlanta Classification. Systemic complications were evaluated according to the Modified Marshall Scoring System. Results: Of the total 610 patients with AP, those with BAP, AAP, and HTGAP were 310 (50.8%), 144 (23.6%), and 17 (2.8%), respectively. Compared with BAP, HTGAP showed higher proportion of moderately severe acute pancreatitis (MSAP) (64.7% vs. 28.1%, p<0.001) and severe acute pancreatitis (SAP) (17.6% vs. 5.5%, p <0.001). And HTGAP showed more local complications (76.5% vs. 26.8%, p<0.001) and higher recurrence rate (52.9% vs. 6.5%, p <0.001), but there was no significant difference in systemic complications (23.5% vs. 11.6%, p =0.140). Contrarily, there was no significant difference between HTGAP and AAP with respect to disease severity (64.7% vs. 63.9% in MSAP and 17.6% vs. 6.9% in SAP, p =0.181), local complications (76.5% vs. 67.4%, p =0.445), recurrence rate (52.9% vs. 32.6%, p =0.096), and systemic complications (23.5% vs. 11.5%, p =0.233). Conclusions: HTGAP showed higher disease severity, more local complications, and higher recurrence rate than BAP. However, there was no significant difference in clinical features between HTGAP and BAP.

Highly luminescent carbon quantum dots (CQDs) are developed as fluorescent probes for selective detection of the heavy-ion Fe3+, where the CQDs exhibit excellent nontoxicity, functionalizability, sensitivity, and selectivity. Biomass-based CQDs and nitrogen-doped CQDs (N-CQDs) are synthesized for the selective detection of Fe3+ by using H2O2 as an oxidant and polyetherimide (PEI) as a nitrogen precursor by a green hydrothermal synthesis method. The prepared CQDs and N-CQDs exhibit an elliptical morphology and with an average particle size of 7 and 4 nm, respectively, and emit blue photoluminescence at 445 and 468 nm under excitation at 367 and 343 nm, respectively. The CQDs and N-CQDs exhibit good water solubility because of the abundant hydroxyl and carboxyl/carbonyl groups and graphic/pyrrolic/pyridinic nitrogen on the surfaces, giving rise to a quantum yield of about 24.2% and 30.7%, respectively. Notably, the Matrimony vine-PEI-based CQDs exhibit excellent Fe3+ selectivity and sensitivity relative to the Matrimony vine-based CQDs due to complexation of the numerous phenolic hydroxyl groups and nitrogen-containing groups with Fe3+, leading to increased fluorescence quenching, which greatly improves the sensitivity of detection. The minimum detection limit was 2.22 μmol L− 1 with a complexation constant of 44.7.

본 연구를 실시하는 목적은 자기성찰과 정신건강 간에서 나타나는 5요인 마음챙김 경로 및 간접효과유의성을 검증하고자 하는데 있다. 본 연구대상은 익산시와 평택시의 애견훈련센터에 방문하는 성인남녀 140명에게 설문조사를 한 후 표기가 불분명한 자료를 제외한 129명의 자료를 토대로 분석하였다. 분석에 사용된 측정도구로는 자기성찰, 5요인 마음챙김, 정신건강에 관한 설문지였다. 본 연구의 자료분석을 위하여 M-Plus 6.12를 활용해 분석하였다. 본 연구의 매개효과에 대한 결과분석에서 자기성찰은 5요인 마음챙김(β=.358, t=4.187, p <.001)에 유의한 정적 영향을 미치는 것으로 나타났다. 그리고 5요인 마음챙김은 정신건강(β=.264, t=2.445, p <.01) 영향을 미치는 것으로 나타났다. 더불어 간접효과유의성검증결과에서 자기성찰이 5요인 마음챙김을 경유하여 정신건강에 이르는 경로의 경우의 간접효과(β=0.123, CI[0.014 ~ 0.319])는 유의한 것으로 나타났다. 이러한 과정을 통하여 자기성찰과 정신건강과 5요인 마음챙김의 관계성 검증분석을 토대로 한 경로 및 간접효과유의성검증을 확인할 수 있었다

In this study, chemical information on a total of 20 individual compounds was constructed to identify isoflavones from the previous reports related with used parts(seeds, leaves, stems, pods) and products of soybean(Glycine max L.). Through constructed library and UPLC-DAD-QToF/MS analysis, a total of 19 individual isoflavones including aglycones, glucosides, acetylglucosides and malonylglucosides as major compounds was identified and quantified from 14 selected soybean seeds. Among them, genistein 7-O-(2"-O-apiosyl)glucoside and genistein 7-O-(6"-O-apiosyl)glucoside(ambocin) were identified tentatively as novel compounds in soybean seeds. Besides, among malonylglucosides, glycitein 4'-O-(6''-O-malonyl)glucoside was estimated for the first time. Total isoflavone contents were distributed from 240.21 to 445.21(mg/100 g, dry matter) and 7-O-6''-O-malonylglucosides were composed of 77.8% on total isoflavone as well as genistein derivatives were confirmed as major class. It was considered importantly that the development of isoflavone-rich varieties was necessary to strengthen their effects such as anti-inflammation, anti-cancer and menopause mitigation. The qualitative and quantitative data presented precisely in this study could be help to select and breed isoflavone-rich varieties. Furthermore, their basic isoflavone profile is expected to be applied to estimate the change of isoflavone conjugates on bioavailability after soy food supplements.

For zinc-air batteries, there are several limitations associated with zinc anodes. The self-discharge behavior of zincair batteries is a critical issue that is induced by corrosion reaction and hydrogen evolution reaction (HER) of zinc anodes. Aluminum and indium are effective additives for controlling the hydrogen evolution reaction as well as the corrosion reaction. To enhance the electrochemical performances of zinc-air batteries, mechanically alloyed Zn-Al and Zn-In materials with different compositions are successfully fabricated at 500rpm and 5h milling time. Investigated materials are characterized by X-ray diffractometer (XRD), field emission scanning electron microscope (FE-SEM), and energy dispersive spectrometer (EDS). Alloys are investigated for the application as novel anodes in zinc-air batteries. Especially, the material with 3 wt% of indium (ZI3) delivers 445.37 mAh/g and 408.52 mAh/g of specific discharge capacity with 1 h and 6 h storage, respectively. Also, it shows 91.72 % capacity retention and has the lowest value of corrosion current density among attempted materials.

This study analyzed the evacuation time in indoor stadiums when exits that automatically open/close when the fire sensor is triggered are installed as a means to improve the problem of closing certain exits. Firstly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all inhabitants was 529.8 seconds when the automatic opening/closing exits are broken and employees are not present. Secondly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all inhabitants was 445 seconds when the automatic opening/closing exits with 750mm width are working but employees are not present. Lastly, when spectators on the 2nd floor stands exit through the 1st floor exits, the RSET of all spectators was 337 seconds when the automatic opening/closing exits with 1,500mm width are working and employees are present. As a result, it was revealed that the evacuation time is shortened when the automatic opening/closing exits are working. Additional comparative studies with actual simulations of people evacuating an indoor stadium and firefighting simulations considering smoke flow are necessary.

본 연구는 2015년 8월부터 2016년 7월까지 납지리의 말조개 내 산란과 적응특성을 조사하기 위해서 만경강 봉서천 일대에서 수행하였다. 납지리의 산란기는 9-11월까지로 추정되었고 성숙한 암컷에서 확인된 알수는 17-75개(36.2 ± 16.44)였다. 조사기간 동안 확인된 조개는 476개체이었고 납지리의 산란이 확인된 조개는 129개체(27.1%)였다. 납지리의 알과 자어가 산란된 조개(46.3 ± 4.55 mm, n = 129)가 산란되지 않은 조개(42.6 ± 8.51 mm, n = 347)보다 더 큰 것으로 나타났다. 안구가 형성되기 전 납지리 자어와 형성된 후 자어의 출현 비율은 2015년 10월부터 2016년 3월까지는 99.8% (n = 597) vs. 0.2% (n = 1)이었고, 4월에는 25.6% (n = 23) vs. 74.4% (n = 67), 5월에는 0% (n = 0) vs. 100% (n = 40)로 확인되었다. 말조개 안에서 확인된 납지리 알과 자어수는 1-18개(5.6 ± 3.81)로 나타났다. 아가미 위치에 따른 납지리 알과 자어수 및 출현빈도는 왼쪽 외반새 1개(0.01 ± 0.09, n = 1), 0.78%, 왼쪽 내반새 1-18개(2.33 ± 3.31, n = 63), 48.84%, 오른쪽 내반새 1-15개(2.97 ± 3.79, n = 76), 58.91%, 오른쪽 외반새 1-12개(0.33 ± 1.71, n = 7), 5.43%로 나타났다. 납지리 알과 자어의 아가미에서 발생위치는 안구 형성 전에는 lower part 3 (L3)에서 71.8% (n = 445), 안구 형성 후에는 L3에서 94.4% (n = 102)로 다른 부위보다 L3에서 모두 높게 나타났다. 납지리의 알과 자어수 및 출현빈도는 조개의 내반새가 외반새보다 높게 나타났다. 납지리는 추계산란종으로 다른 납자루아과 어류나 글로키디아 조개 유생과의 조개 안에서의 경쟁은 피하는 장점이 있지만 낮은 수온의 겨울을 보내야 한다. 이에 납지리는 안구형성 전인 낮은 수온에서는 배아적 휴면(embryonic diapause)을, 안구형성 후에는 수관에서 상새방 으로의 이동에너지 절약을 위한 상새방 내 산란이라는 방향으로 적응해 온 것으로 판단된다.

PURPOSES: The purpose of this study is to compare the consistency of widths by analyzing the current situation of the sidewalk in Korea and Japan Neighborhoods Area. METHODS: Literature on the sidewalk width of the Neighborhood Area is reviewed to compare the consistency of width. Through on-site surveys, We identify the current status of sidewalk in Korea and Japan. This compares the sidewalk width consistency in the Neighborhood Area. RESULTS : The width of whole sidewalks in Japan is ranged 330~445cm, which is lAvger than The width of whole sidewalks in Korea, ranged 237~420cm. Frontage Zone width is ranged 60~65cm in Japan, similar to 60cm in Korea. However, in Korea, there is a lAvge difference between Frontage Zone width and walking width average, and the standard deviation of width is lAvger than Japan. The Pedestrian Zone width is ranged 172~325cm in Japan, which is lAvger than ranged 0~295cm in Korea. The width of the Furniture Zone is ranged 135 ~ 331cm in Japan and lAvger than ranged 90~225cm in Korea. In Korea, the difference between the Furniture Zone width and the walking average width is small, and the standard deviation of width is smaller than that of Japan. CONCLUSIONS : In conclusion, the standard deviation of the frontage zone and the pedestrian zone width, which are included in the valid sidewalk width, The Korea is lAvger than in Japan. valid sidewalk width of Korea sidewalk is inconsistent. valid sidewalk width for wheelchair users does not meet the width of more than 2 meters.

국립생물자원관에서는 자체 연구과제인 ‘자생 천적자원 발굴 및 증식 사업’의 일환으로 2017년부터 한국 분포천적자원의 정보를 확인하고 분류학적 정보 및 생물 정보를 확보하여 ‘식물-해충’, ‘곤충-천적’ 관계에 대한 database구축을 수행하고 있다. 이에 한반도 전체 곤충강 중 현재까지 수집된 결과에 대해 보고하고자 한다. 2016년까지국가 생물종 목록 기준 한국에 기록된 관속식물종수는 4,455종, 곤충종수는 16,993종이며, 이 중 445종의 식물을가해하는 736종의 해충정보와 574종의 곤충에 대한 628종의 천적 정보를 확보하였다. 이 중 식물-해충-천적의 삼중관계(tritrophic interaction)가 성립되는 건수는 632건 이었다. 그러나 식물을 가해하는 해충 및 천적 정보가 확보된 분류군은농업해충인 진딧물류에 대부분 편중되어 있어(363종, 63.2%) 좀 더 다양한 분류군에 대한 정보 확보가 추후의과제이다. 본 과제를 통해 앞으로 전 곤충종에 대한 천적정보 확보를 최종 목표로 국가 생물자원의 활용에 근간이되는 자료를 제공할 수 있으리라 기대한다.

The purpose of this study was to investigate the quality characteristics of roasted peanuts and the antioxidative effect of peanut oil added with sesame oil. Saltiness of roasted peanut increased with increasing salt content. In terms of color value, L and b values decreased as increasing concentration increased, whereas a value increased with increasing salt content. Overall, sensory evaluations proved that roasted peanuts with 15% added salt was preferred over other samples. For peanut oil added with sesame oil, acid values increased during the storage period, whereas samples made with sesame oil had lower values than the control group. Peroxide values increased rapidly for 21 days and then decreased. The acid and peroxide values were lower in peanut oil added with 50% sesame oil compared to peanut oil added with 30%, 10%, and 70% sesame oil, as well as the control. The TBA values of peanut oil made with 50% and 30% sesame oil were lower than those of the control and 70% and 10% sesame oil. According to the Rancimat method, PS-50% (524 min) and PS-30% (453 min) demonstrated longer induction periods as compared to the control (280 min), PS-70% (445 min), and PS-10% (291 min) samples.

We detected bright mid- to far-infrared emission from the helium nova V445 Puppis in the AKARI all-sky survey data taken in 2006. Assuming an optically thin condition, we decomposed the spectral energy distribution (SED) of V445 Puppis in October 2006 by model tting and found that the SED can be explained by a combination of cold amorphous carbon (125 K and the mass of 4:5+6:6 2:7 X 10-4 M⊙) and warm amorphous carbon (250 K and the mass of 1:8+1:0 -0:5 X 10-5 M⊙). Assuming that the former is pre-existing dust formed in the past nova outbursts and the latter is newly formed dust in December 2000's nova wind, this result suggests that the amount of dust formed around V445 Puppis in a single outburst is larger than 10-5 M⊙, which is larger than those in any other classical novae ever reported.

This study was performed to provide fundamental data on the convenience foods purchase according to the food-related lifestyle. The subject was 250 Chinese students in South Korea region through a self-administered questionnaire. A factor analysis extracted five comprising food-related lifestyle, which we named health seeking (factor 1), taste seeking (factor 2), easy seeking (factor 3), popularity seeking (factor 4) and safety seeking (factor 5). According to the results of the reliability analysis, the food-related lifestyle showed an average of 3.16 and 0.813 for Cronbach's alpha coefficient. There were significant differences for the selection of convenience foods according to health seeking (p<0.05). Also, the popularity seeking and easy seeking lifestyle factors showed significant differences for the reason the purchase criteria of convenience food (p<0.05). There was not significant differences in convenience foods of selection criteria according to health seeking, taste seeking, easy seeking, popularity seeking and safety seeking types (p<0.05). A significant positive result of the internal characteristics of convenience foods purchase (p<0.05) was shown for the health seeking and taste seeking. A significant positive result of the external characteristics of convenience food purchase (p<0.05) was shown for the health seeking, taste seeking and safety seeking. In the correlation between convenience food purchase factors, the correlation coefficient of nutrition and ingredients are highest with 0.46, 0.445 in cooking and price, 0.441 in ingredients and expiry date, 0.383 in brand and price, 0.361 in taste and easy. In conclusion, this study presented the desirable direction of convenience food consumption in Chinese students.