• Journal of Microbiology and Biotechnology
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• 제26권9호
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• pp.1527-1532
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• 2016

Strain SPF4211, having hyaluronidase (HAase) inhibition activity, was isolated from P. davidiana (Carriere) Franch fruit (PrDF) sugar extract. The phenotypic and biochemical properties based on 16S rDNA sequencing and an API 50 CHB kit suggested that the organism was B. subtilis. To optimize the HAase inhibition activity of PrDF extract by fermentation of strain SPF4211, a central composite design (CCD) was introduced based on three variables: concentration of PrDF extract (X₁: 1-5%), amount of starter culture (X₂: 1-5%), and fermentation time (X₃: 0-7 days). The experimental data were fitted with quadratic regression equations, and the accuracy of the equations was analyzed by ANOVA. The statistical model predicted the highest HAase inhibition activity of 37.936% under the optimal conditions of X₁ = 1%, X₂ = 2.53%, and X₃ = 7 days. The optimized conditions were validated by observation of an actual HAase inhibition activity of 38.367% from extract of PrDF fermented by SPF4211. These results agree well with the predicted model value.

• 한국통신학회논문지
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• 제33권4B호
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• pp.215-223
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• 2008

Retransmission signals from relays to destination when the destination fails to decode received signal from the source in Automatic Repeat Request (ARQ) protocol make the destination receive signals more reliably. With using omni -direction antenna in the practical system, in communication range of both the source antenna and the destination antenna, there are some relays that can be used to transmit signal to the destination. However, using all relays to transmit signal consume power and bandwidth. In this paper, we propose a new protocol in which the best relays are chosen based on threshold of distance from the source to the relay and the relay to the destination when the relays use decode- and forward (DF) protocol. Simulation results prove the efficiency of the protocol when we compare using only the best relays with using all relays to transmit signal to the destination.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 추계학술대회 논문집
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• pp.814-817
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• 2005

Today recycling has been one of the most important Issues In industry as it is required to save the limited amount of natural resources and to keep the environment green. In spite of many efforts to increase recycling rate in industry, however, the practical solutions are very limited. The difficulties are caused by the existence of many parts made of diverse materials and their inevitably complicated assembly structures to satisfy different needs. This paper represents a study on the disassembly sequence generator system for parts recycling. With disassembly costs and revenues, the optimum disassembly sequence can be found with a linear programming.

• Journal of Communications and Networks
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• 제11권5호
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• pp.433-444
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• 2009

The bi-directional relay channel is the natural extension of a three-terminal relay channel where node a transmits to node b with the help of a relay r to allow for two-way communication between nodes a and b. That is, in a bi-directional relay channel, a and b wish to exchange independent messages over a shared channel with the help of a relay r. The rates at which this communication may reliably take place depend on the assumptions made on the relay processing abilities. We overview information theoretic limits of the bi-directional relay channel under a variety of conditions, before focusing on half-duplex nodes in which communication takes place in a number of temporal phases (resulting in protocols), and nodes may forward messages in four manners. The relay-forwarding considered are: Amplify and forward (AF), decode and forward (DF), compress and forward (CF), and mixed forward. The last scheme is a combination of CF in one direction and DF in the other. We derive inner and outer bounds to the capacity region of the bi-directional relay channel for three temporal protocols under these four relaying schemes. The first protocol is a two phase protocol where a and b simultaneously transmit during the first phase and the relay r alone transmits during the second. The second protocol considers sequential transmissions from a and b followed by a transmission from the relay while the third protocol is a hybrid of the first two protocols and has four phases. We provide a comprehensive treatment of protocols in Gaussian noise, obtaining their respective achievable rate regions, outer bounds, and their relative performance under different SNR and relay geometries.

• 대한수학회보
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• 제35권1호
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• pp.99-117
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• 1998

Let $(B, H, p_1)$ be an abstract Wiener space and $F(B)$ the Fresnel class on $(B, H, p_1)$ which consists of functionals F of the form : $$ F(x) = \int_{H} exp{i(h,x)^\sim} df(h), x \in B, $$ where $(\cdot, \cdot)^\sim$ is a stochastic inner product between H and B, and f is in $M(H)$, the space of complex Borel measures on H. We introduce an $L_1$ analytic Fourier-Feynman transforms for functionls in $F(B)$. Furthermore, we introduce a convolution on $F(B)$, and then verify the existence of the $L_1$ analytic Fourier-Feynman transform for the convolution product of two functionals in $F(B)$, and we establish the relationships between the $L_1$ analytic Fourier-Feynman tranform of the convolution product for two functionals in $F(B)$ and the $L_1$ analytic Fourier-Feynman transforms for each functional. Finally, we show that most results in [7] follows from our results in Section 3.

• 한국조리학회지
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• 제21권3호
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• pp.212-231
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• 2015

본 연구는 특 1급 호텔 식음료 부서의 종사원을 대상으로 직무열의의 선행요인(인정, 권한위임, 공정한 보상, 절차공정성, 조직지원인식)을 고찰하여 결수변수(이직의도)에 미치는 인과관계를 규명해 보고자 하였다. 실증연구를 위해 확보된 402개의 표본을 바탕으로 연구모형의 신뢰성, 적합성 등을 검토하였고, 구조방정식 모형을 사용하여 총 6개의 가설을 검증하였으며, 모형의 적합도는 ${\chi}^2=668.894$(p<.001), df=373, CMIN/DF=1.794, GFI=.901, AGFI=.877, NFI=.928, CFI=.967, RMSEA=.044 등으로 조사되었다. 연구결과, 직무열의의 선행요인 중 인정, 권한위임, 공정한 보상, 절차공정성, 조직지원인식은 직무열의에 긍정적인 영향을 미치는 것으로 조사되었으며, 이러한 직무열의는 이직의도에 부정적인 영향을 주는 것으로 조사되었다. 이를 통해 최적의 조직(직무)환경은 종사원들의 직무열의를 높여줌으로써 이직의도는 감소한다는 사실을 확인할 수 있었다. 그러므로 특급호텔 식음료 부서에서는 효과적인 인적자원 관리 측면에서 다양한 세분화된 내부마케팅 방안들이 모색되어야 할 것으로 사료된다. 끝으로 이론적, 실무적 시사점과 더불어 연구의 한계 및 향후 연구방향에 대해서도 논의하였다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권12호
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• pp.1942-1949
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• 2019

Objective: Leukocyte cell-derived chemotaxin 2 (LECT2) is associated with several physiological processes including inflammation, tumorigenesis, and natural killer T cell generation. Chicken LECT2 (chLECT2) gene was originally identified as one of the differentially expressed genes in chicken kidney tissue, where the chickens were fed with different calcium doses. In this study, the molecular characteristics and gene expression of chLECT2 were analyzed under the stimulation of toll-like receptor 3 (TLR3) ligand to understand the involvement of chLECT2 expression in chicken metabolic disorders. Methods: Amino acid sequence of LECT2 proteins from various species including fowl, fish, and mammal were retrieved from the Ensembl database and subjected to Insilco analyses. In addition, the time- and dose-dependent expression of chLECT2 was examined in DF-1 cells which were stimulated with polyinosinic:polycytidylic acid (poly [I:C]), a TLR3 ligand. Further, to explore the transcription factors required for the transcription of chLECT2, DF-1 cells were treated with poly (I:C) in the presence or absence of the nuclear factor ${\kappa}B$ ($NF{\kappa}B$) and activated protein 1 (AP-1) inhibitors. Results: The amino acid sequence prediction of chLECT2 protein revealed that along with duck LECT2 (duLECT2), it has unique signal peptide different from other vertebrate orthologs, and only chLECT2 and duLECT2 have an additional 157 and 161 amino acids on their carboxyl terminus, respectively. Phylogenetic analysis suggested that chLECT2 is evolved from a common ancestor along with the actinopterygii hence, more closely related than to the mammals. Our quantitative polymerase chain reaction results showed that, the expression of chLECT2 was up-regulated significantly in DF-1 cells under the stimulation of poly (I:C) (p<0.05). However, in the presence of $NF{\kappa}B$ or AP-1 inhibitors, the expression of chLECT2 is suppressed suggesting that both $NF{\kappa}B$ and AP-1 transcription factors are required for the induction of chLECT2 expression. Conclusion: The present results suggest that chLECT2 gene might be a target gene of TLR3 signaling. For the future, the expression pattern or molecular mechanism of chLECT2 under stimulation of other innate immune receptors shall be studied. The protein function of chLECT2 will be more clearly understood if further investigation about the mechanism of LECT2 in TLR pathways is conducted.

• Korean Journal of Mathematics
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• 제22권1호
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• pp.91-121
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• 2014

Let X and Y be vector spaces. It is shown that a mapping $f:X{\rightarrow}Y$ satisfies the functional equation ${\ddag}$ $$2df(\frac{x_1+{\sum}_{j=2}^{2d}(-1)^jx_j}{2d})-2df(\frac{x_1+{\sum}_{j=2}^{2d}(-1)^{j+1}x_j}{2d})=2\sum_{j=2}^{2d}(-1)^jf(x_j)$$ if and only if the mapping $f:X{\rightarrow}Y$ is additive, and prove the Cauchy-Rassias stability of the functional equation (${\ddag}$) in Banach modules over a unital $C^*$-algebra, and in Poisson Banach modules over a unital Poisson $C^*$-algebra. Let $\mathcal{A}$ and $\mathcal{B}$ be unital $C^*$-algebras, Poisson $C^*$-algebras, Poisson $JC^*$-algebras or Lie $JC^*$-algebras. As an application, we show that every almost homomorphism $h:\mathcal{A}{\rightarrow}\mathcal{B}$ of $\mathcal{A}$ into $\mathcal{B}$ is a homomorphism when $h(d^nuy)=h(d^nu)h(y)$ or $h(d^nu{\circ}y)=h(d^nu){\circ}h(y)$ for all unitaries $u{\in}\mathcal{A}$, all $y{\in}\mathcal{A}$, and n = 0, 1, 2, ${\cdots}$. Moreover, we prove the Cauchy-Rassias stability of homomorphisms in $C^*$-algebras, Poisson $C^*$-algebras, Poisson $JC^*$-algebras or Lie $JC^*$-algebras, and of Lie $JC^*$-algebra derivations in Lie $JC^*$-algebras.

• Journal of Nutrition and Health
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• 제41권1호
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• pp.100-110
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• 2008

본 연구에서는 3,149가지의 식이섬유 DB를 새로이 구축하고, 이 자료와 2001년 국민건강 영양조사 자료 중 24시간 회상법에 의한 식품섭취조사 결과를 활용하여 20세 이상 한국인의 식이섬유 섭취량을 성별, 연령별, 지역별로 구분하여 섭취열량 1,000 kcal당 식이섬유섭취량과 일일 총 식이섬유 섭취량을 AI와 비교평가 하였다. 또한 새로 구축한 식이섬유 D/B에서 구분한 식품군을 이용하여 식이섬유 섭취 기여식품군을 조사하였으며, 연구결과를 요약하면 다음과 같다. 1) 전체 대상자의 1,000 kcal당 평균 식이섬유 섭취량은 12.24 g/1,000 kcal이고, 남성은 11.47 g/1,000 kcal, 여성은 12.88 g/1,000 kcal로, 남성은 AI에 미달되었고, 여성은 AI보다 많았다. 일일 식이섬유 총 섭취량은 전체 23.58g, 남성 25.04g, 여성 22.36g으로 유의적으로 남성이 여성보다 많았다. 2) 연령별로 영양섭취 기준을 판정한 결과 섭취열량 1,000 kcal당 식이섬유 섭취량은 남성은 $50{\sim}64$세 (12.45 g/1,000 kcal), $65{\sim}74$세 (13.27 조 1,000 kcal)에서만 AI보다 많이 섭취하고 있었고, 여성은 $20{\sim}29$세 (11.20 g/1,000 kcal)에서만 AI보다 적게 섭취하였다. 1인 1일 식이섬유 총 섭취량은 여성 $30{\sim}49$세 (23.18 g/day), $50{\sim}64$세 (24.27g/day)를 제외하고는 모든 그룹에서 AI보다 적은 양을 섭취하고 있었다. 3) 지역을 대도시, 중소도시, 읍면지역으로 나누어 식이섬유 섭취를 평가한 결과 읍면지역> 중소도시 > 대도시 순으로 섭취하고 있었으며, 1,000 kcal당 식이섬유 섭취량은 대도시에서 AI보다 적게 섭취하고 있으면서 각 지역 간에 유의적인 차이를 보였으나, 1일 총 식이섬유 섭취량으로 비교 시에는 유의적인 차이를 보이지 않았다. 4) 20세 이상 전체 대상자의 식이섬유 기여식품군은 채소류 (40.98%) > 곡류 (19.86%) > 과일류 (14.98%) 순으로 이 세 가지 군이 전체의 75% 이상을 차지하고 있었다. 성별, 연령별, 지역별 평균 섭취량으로 비교 시 $50{\sim}64$세, $65{\sim}74$세 여성만 채소류 > 과일류 > 곡류 순으로 섭취하고 있었으며, 그 외 모든 군에서는 채소류 > 곡류 > 과일류 순으로 산출되었다. 식이섬유 섭취에 기여하는 상위 10대 단일 식품은 배추김치, 백미, 단감, 고춧가루, 무청, 글, 두부, 배, 사과, 대두였으며 계절적 요인을 받는 과일과 무청을 제외한 나머지 식품에서 전체 식이섬유의 30% 이상을 섭취하고 있었다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.240-247
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• 2006

Piezoelectric sensor-based health monitoring technique using a two-step support vector machine (SYM) classifier is discussed for damage identification of a railroad track. An active sensing system composed of two PZT patches was investigated in conjunction with both impedance and guided wave propagation methods to detect two kinds of damage of the railroad track (one is a hole damage of 0.5cm in diameter at web section and the other is a transverse cut damage of 7.5cm in length and 0.5cm in depth at head section). Two damage-sensitive features were extracted one by one from each method; a) feature I: root mean square deviations (RMSD) of impedance signatures and b) feature II: wavelet coefficients for $A_0$ mode of guided waves. By defining damage indices from those damage-sensitive features, a two-dimensional damage feature (2-D DF) space was made. In order to minimize a false-positive indication of the current active sensing system, a two-step SYM classifier was applied to the 2-D DF space. As a result, optimal separable hyper-planes were successfully established by the two-step SYM classifier: Damage detection was accomplished by the first step-SYM, and damage classification was also carried out by the second step-SYM. Finally, the applicability of the proposed two-step SYM classifier has been verified by thirty test patterns.