• 한국조리학회지
• /
• 제22권4호
• /
• pp.192-203
• /
• 2016

본 연구는 2016년 1월 1일 경부터 1월 30일에 이르는 한 달의 조사기간을 두어 실시하였고, 자료 수집은 서울 시내 프랜차이즈 레스토랑을 대상으로 연구목적과 설문내용을 충분히 설명한 후, 레스토랑 책임자의 책임하에서 방문하는 고객에게 자기기입식으로 응답하게 하였다. 첫째, 프랜차이즈 레스토랑 이용동기가 소비자들의 재방문에 미치는 영향을 분석하기 위해 회귀분석을 실시했다. 그 결과, 식도락은 B=0.553(p<.001), 편리는 B=0.093(p<.05), 사교는 B=0.294(p<.001), 과시는 B=0.085(p<.01)로 소비자 재방문에 유의적인 정(+)의 영향력이 있었다. 하지만 유행은 재방문에 아무런 영향력이 없었다. 둘째, 프랜차이즈 레스토랑 이용동기와 소비자 재방문과 웹소문의 조절효과는 1단계에서는 결정계수는 0.683, F=116.279(p<.001)로 모형은 유의적으로 나왔다. 2단계 모형에서는 '소비문화'의 추가로 인한 설명력의 증가는 2.9%이고, 이에 대한 F=26.791(p<.001)로 '재방문' 추가는 유의적으로 나왔다. 3단계에서는 식도락, 사교는 웹소문에 유의적인 부(-)의 영향력이 있었고, 편리, 유행, 과시는 아무런 영향이 없었다.

• 대한기계학회논문집B
• /
• 제26권1호
• /
• pp.141-149
• /
• 2002

A numerical simulation is performed for the cooling heat transfer of a heated cylindrical pedestal by an axisymmetric jet impingement. Based on the k- $\varepsilon$- f$\sub$${\mu}$/ model of Park et at., the linear and nonlinear stress-strain relations are extended. The Reynolds number based on the jet diameter(D) is fixed at Re$\sub$D/ = 23000. The local heat transfer coefficients are compared with available experimental data. The predictions by k- $\varepsilon$-f$\sub$${\mu}$/ model are in good agreement with the experiments, whereas the standard 7- f model does not properly resolve the flow structures.

• 대한기계학회논문집B
• /
• 제26권3호
• /
• pp.423-431
• /
• 2002

An experimental study is conducted to investigate the effect of two-frequency forcing on turbulent flow behind a backward-facing step at the Reynolds number of 27000 based on the step height. The forcing is provided from a thin slit located at the edge of the backward-facing step to increase mixing behind the backward-facing step and consequently to reduce the reattachment length. With single frequency forcing, the minimum reattachment length is obtained at the non-dimensional forcing frequency (F) of St$\_$h/ = 0.29. With two-frequency forcing, a subharmonic frequency (F/2) or biharmonic frequency (2F) is combined with the fundamental frequency (F), i.e. (F, F/2) or (F, 2F) forcing is applied. In the case of (F, F/2) forcing, the reattachment length is not much sensitive to the phase difference between F and F/2. However, the reattachment length significantly depends on the phase difference between F and 2F in the case of (F, 2F) forcing. At a certain range of the phase difference, the reattachment length becomes smaller than that of the single frequency forcing.

• Korean Journal of Mathematics
• /
• 제26권1호
• /
• pp.87-101
• /
• 2018

The purpose of this paper is to define a new class of hyperholomorphic functions spaces, which will be called $F^{\alpha}_{{\omega},G}$(p, q, s) type spaces. For this class, we characterize hyperholomorphic weighted ${\alpha}$-Bloch functions by functions belonging to $F^{\alpha}_{{\omega},G}$(p, q, s) spaces under some mild conditions. Moreover, we give some essential properties for the extended weighted little ${\alpha}$-Bloch spaces. Also, we give the characterization for the hyperholomorphic weighted Bloch space by the integral norms of $F^{\alpha}_{{\omega},G}$(p, q, s) spaces of hyperholomorphic functions. Finally, we will give the relation between the hyperholomorphic ${\mathcal{B}}^{\alpha}_{{\omega},0}$ type spaces and the hyperholomorphic valued-functions space $F^{\alpha}_{{\omega},G}$(p, q, s).

• 한국수정란이식학회지
• /
• 제31권1호
• /
• pp.27-32
• /
• 2016

This study was conducted to evaluate the effects of different volume ($100{\mu}l$ vs. 2 ml) of microdrop culture on B6D2F1 mice oogenesis. In the present study, B6D2F1/CrljOri $F_1$ mice were utilized in order to maximize oogenesis. Also we used TCM-199, Dulbecco's medified Eagle's medium (DMEM), embryo culture medium (Fertilization medium, Cleavage medium, Blastocyst medium), G series medium and One step medium. Blastulation rate was not different between groups ($58.4{\pm}2.9%$ vs. $61.2{\pm}4.8%$). Zona hatched rate ($38{\pm}15.4%$ vs. $27{\pm}3.4%$) and attached rate ($55{\pm}13.9%$ vs. $46{\pm}3.9%$) did not differ by the volume of culture media. Total cell numbers ($59.8{\pm}9.7$ vs. $70.3{\pm}8.7$), ICM cell numbers ($15.8{\pm}0.6$ vs. $16.8{\pm}1.5$), TE cell numbers ($44.0{\pm}9.7$ vs. $53.6{\pm}7.3$), % ICM ($26.4{\pm}2.9%$ vs. $23.8{\pm}3.3%$) and ICM:TE ratio ($1:2.8{\pm}0.4$ vs. $1:3.2{\pm}0.6$) were not different between groups (i.e., $100{\mu}l$ vs. 2 ml). These results show that the capacity of the culture medium did not effect the cell numbers of B6D2F1 mice blastocysts. In summary, these results can provide fundamental data to maximize culture condition for in vitro fertilization on B6D2F1 mice.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제26권3호
• /
• pp.199-208
• /
• 2019

A necessary and sufficient condition in terms of lower cut sets is given for the insertion of a Baire-.5 function between two comparable real-valued functions on the topological spaces that whose $F_{\sigma}$-kernel of sets are $F_{\sigma}$-sets.

• 한국수학교육학회지시리즈B:순수및응용수학
• /
• 제26권1호
• /
• pp.1-12
• /
• 2019

Necessary and sufficient conditions in terms of lower cut sets are given for the strong insertion of a Baire-.5 function between two comparable real-valued functions on the topological spaces that $F_{\sigma}-kernel$ of sets are $F_{\sigma}-sets$.

• 한국발생생물학회지:발생과생식
• /
• 제26권1호
• /
• pp.13-21
• /
• 2022

Neurokinin B (NKB) is a neuropeptide involved in the regulation of reproductive endocrine system of vertebrate animals, including fish. However, the pathway of NKB action in fish has not been clearly elucidated. In order to clarify the effect of NKB and NKF (neurokinin F) on gonadotropic hormone (GTH) gene expression in the pituitary, we studied the changes of LHβ and FSHβ gene expressions by using two different pituitary culture methods (whole pituitary culture or dispersed pituitary cell culture). Pituitaries were removed from mature female and male Nile tilapia. Changes of LHβ and FSHβ gene expressions were measured and compared after the treatment with NKB or NKF peptides at concentrations 0 to 1,000 nM. Expression of GTH genes in the whole pituitary cultures treated with NKB or NKF peptides did not show significant difference except in female at one concentration when treated with NKF. On the contrary, there were significant changes of GTH gene expressions in the dispersed pituitary cell cultures when treated with NKB and NKF peptides. These results suggest that dispersed pituitary cell culture is more relevant than whole pituitary culture in studying the function of pituitary, and that NKB and NKF could act directly on the pituitary to regulate the expression of GTH genes.

• 한국전자파학회논문지
• /
• 제26권2호
• /
• pp.148-157
• /
• 2015

본 논문에서는 발사체와 지상국과의 RF 호환성 시험을 효율적으로 수행하기 위한 소형 안테나 햇을 제안한다. 제안된 구조에서는 통상적으로 쓰는 흡수체가 아닌 도체로 쉴드된 구조를 사용하여 안테나 햇의 소형화와 저손실을 구현하였다. 제작된 S-밴드 안테나 햇의 크기는 $88mm{\times}35mm{\times}44mm$로 역-F 탑재안테나의 크기($74mm{\times}13mm{\times}16mm$)에 비해 많이 크지 않으면서 중심주파수 2.25 GHz에서 25.6 dB의 반사손실, 0.26 dB의 삽입 손실, 49.4 dB의 누설손실을 갖는다. 시뮬레이션 결과와 측정 결과가 상당한 유사성을 보여준다.

• Journal of Chest Surgery
• /
• 제13권1호
• /
• pp.26-33
• /
• 1980

The incidence of the empyema thoracis has been drastically reduced with the advent of antimicrobial drugs. Empyema thoracis is however still dealt with one of major problems in thoracic surgery because of difficulties in the management of associated bronchopleural fistula. During the period of January 1975 to June 1979, 145 patients of empyema thoracis were treated in the Department of Thoracic Surgery, Busan National University Hospital. This reports dealed especially with the incidence, etiology and management of chronic empyema thoracis with B.P.F. and estimated the results of intercostal myoplasty. The results: 1 ] Among 145 empyema thoracis patients, 33 patients [22.7%] had bronchopleural fistula. 2] Male predominated in general with the ratio of 4:1 and in empyema thoracis with B.P.F. male predominance was further more prominent with the ratio of 10:1. Peak incidence of chronic empyema thoracis lay on 3rd and 4th decade. 3] The most common causation of empyema thoracis was pneumonia [77.3%] in children and tuberculosis [48.8%] in adult. 4] The most common causative organism of empyema thoracis was staphylococcus aureus [52.5%]. 5] Among 40 cases of resection for pulmonary tuberculosis, 4 cases developed empyema thoracis with B.P.F. [10%], and resection for another underlying pathology was 2.1%. 6] In contrast to good prognosis of acute empyema thoracis, chronic empyema thoracis with B.P.F. was improved only 66.6% of cases. 81.5% of chronic empyema without B.P.F. were cured completely. 7] Intercostal myoplasty were performed in 21 cases of empyema thoracis with B.P.F. and of which 15 cases showed that fistula were closed. 8] The over all mortality rate in empyema thoracis was 8.7%. The mortality rate of chronic empyema thoracis with and without B.P.F. was 15.2% and 5.3% respectively.