• 한국축산식품학회지
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• 제35권4호
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• pp.524-532
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• 2015

The objective of this study was to investigate the effects of high post-mortem temperature application on development of pale, soft, exudative (PSE) turkey meat characteristics in terms of local slaughter conditions. Within this scope, it was targeted to obtain PSE-like muscles benefiting from different post-mortem temperature applications. Immediately after slaughter, turkey Pectoralis major (n=15) muscles were kept at various post-mortem temperatures (0, 10, 20, 30, and 40℃) for 5 h. pH values of 40°C treatment were lower than four other treatments (p<0.05). L* values, drip loss, cook loss, and thawing loss of 40℃ group were higher than the other groups (p< 0.05). Napole yield of 40℃ treatment indicated that high post-mortem temperature decreases brine uptake. Protein solubility of 40℃ group was lower than 0℃ group (p<0.05). Expressible moisture did not differ between 0 and 40℃ treatments. Hardness, gumminess and chewiness of 40℃ treatment were higher than 0℃ treatment. The results of this research showed that high post-mortem temperature treatment induced development of PSE-like turkey meat, with lower pH, paler color, higher technological and storage losses, and reduced protein solubility and texture.

• International Journal of Control, Automation, and Systems
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• 제5권5호
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• pp.526-538
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• 2007

This paper presents a neural network based decentralized excitation controller design for large-scale power systems. The proposed controller design considers not only the dynamics of generators but also the algebraic constraints of the power flow equations. The control signals are calculated using only local signals. The transient stability and the coordination of the subsystem control activities are guaranteed through rigorous stability analysis. Neural networks in the controller design are used to approximate the unknown/imprecise dynamics of the local power system and the interconnections. All signals in the closed loop system are guaranteed to be uniformly ultimately bounded. To evaluate its performance, the proposed controller design is compared with conventional controllers optimized using particle swarm optimization. Simulations with a three-machine power system under different disturbances demonstrate the effectiveness of the proposed controller design.

• 대한기계학회논문집B
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• 제33권12호
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• pp.983-991
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• 2009

The heat transfer phenomenon was investigated in this study when a circular water jet with low velocity flows to the downward facing heated circular plate and against the direction of gravity. Data are presented for jet flow rate between 0.23 and 2.3 l/min, jet fluid temperature of 24$^{\circ}C$, heat fluxes between 345 and 687 W/m$^2$, H/D=1, 2 and 3 with a single round jet diameter 2mm. The effects of heat flux, jet velocity and H/D on the local heat transfer are investigated in for the various regions of jet impingement. The local heat transfer distributions are analyzed based on the visualization of jet flow field. Data from experimental results are correlated by expressions of the form Nu=0.01$Re^{0.58}{\cdot}Pr^{0.4}$.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2003년도 추계학술대회
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• pp.1234-1239
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• 2003

A failure analysis of holddown spring screw was performed using fracture mechanics approach. The spring screw was designed such that it was capable of sustaining the loads imposed by the initial tensile preload and operational loads. In order to investigate the cause of failure, a stress analysis of the top nozzle spring assembly was done using finite element analysis and a life prediction of the screw was made using a fracture mechanics approach. The elastic-plastic finite element analysis showed that the local stresses at the critical regions of head-shank fillet and thread root significantly exceeded than the yield strength of the screw material, resulting in local plastic deformation. Primary water stress corrosion cracking life of the Inconel 600 screw was predicted by using integration of the Scott model and resulted in 1.42 years, which was fairly close to the actual service life of the holddown spring screw.

• 한방안이비인후피부과학회지
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• 제13권1호
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• pp.141-156
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• 2000

Cloves are the dried flower buds of Syzygium aromaticum (L.) Mere et Perry (Myrtaceae). They have been successfully used for the management of various allergic disorders by oral administration in Korea. In this study, the author investigated the effect of an aqueous extract of Syzygium aromaticum on immediate-type hypersensitivity by anal administration. Anal administration of Syzygium aromaticum showed a marked inhibition rate in systemic hypersensitivity with a dose of 1 mg/kg 1 hr before intraperitoneal injection of compound 48/80. Anal administration of Syzygium aromaticum significantly reduced plasma histamine contents induced by compound 48/80. Anal administration of Syzygium aromaticum (1 mg/kg) also inhibited to $61.4\%$ (P<0.01) local a1lergic reaction activated by anti-dinitrophenyl (DNP) IgE. In addition, Syzygium aromaticum dose-dependently inhibited the histamine release from the peritoneal mast cells by compound 48/80 or anti-DNP IgE. When Syzygium aromaticum was added, the level of cAMP in peritoneal mast cells transiently and significantly increased about 47-fold at 10 second compared with that of basal cells. These results provide evidence that anal therapy of Syzygium aromaticum may be beneficial in the treatment of systemic and local immediate-type hypersensitivity by inhibition of histamine release from mast cells in vivo and in vitro.

• Archives of Plastic Surgery
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• 제38권4호
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• pp.339-344
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• 2011

Purpose: The goal of cancer surgery is complete removal of cancer tissue and prevention of recurrence. Surgeons can change the surgical instruments after total resection of the cancer mass. The purpose of this procedure is to prevent dissemination of the cancer cells attached to the surgical instruments. Authors hypothesize the possibility of local recurrence caused by the cancer cells attached to the surgical instruments in the skin cancer cases. Methods: Skin cancers were induced by using DMBA-TPA two-stage carcinogenesis model in 10 of Balb/c mice. In 2-weeks, skin cancer was developed in all 10 mice. cancer cell attached surgical instruments were made by pinching the removed cancer tissue using Adson tissue forcep 10, 20, 30 times each. To count number of cancer cells in each forcep with different number of pinching was done, the forceps were washed in 30 mL of the normal saline and Cytospin preparation was done. To make recurrence models from cancer cell attached surgical instrument, three incisions were made in normal skin of each mouse, and local seeding was done by pinching subcutaneous tissue in 10, 20, 30 times each by using Adson teeth forceps mentioned above as cancer cell attached surgical instrument. Results: All skin cancers were squamous cell carcinoma. Local recurrences were developed in 7 mice (3 in 10 times forceping site, 2 in 20 times forceping and 3 in 30 times forceping). In the cytospin test, the mean number of squamous cells in 100 microscope was 28.6 in 10 times, 47.2 in 20 times, 93.6 in 30 times, respectively. P value was 0.002 in Wilcoxon-Sign test. Conclusion: The number of cell count was significantly increased as number of pinching was increased. And these cells are able to induce local recurrence by local seeding. Considering this result, authors are able to confirm that the minimal handling in cancer surgery is important factor to prevent local recurrence.

• 전자공학회논문지S
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• 제35S권8호
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• pp.12-20
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• 1998

전광 통신망(All-Optical Network)은 근거리와 원거리 통신망을 위한 차세대 광대역 통신먕이며 이를 위한 많은 광교환기들이 제안되고 있다. 특히 파장 분할 다중화 기법을 적용한 광교환기는 전광 통신망에서 B-ISDN 서비스를 위한 망의 투명성과 토폴로지 측면에서 많은 장점을 갖는다. 본 논문에서는 광링크 기반의 고속 ATM 망을 위한 두 종류의 넉아웃 광교환기 구조를 제안하였다. 제안된 구조는 파장 분할 다중화 기법을 이용하여 전광 영역에서 동작할 수 있도록 하였으며, 구조-Ⅰ과 구조-Ⅱ로 명명하였다. 각 구조는 구성 소자수 및 소자 종류에 의하여 다른 특성을 갖으며, 시스템의 성능과 복잡도도 많은 영향을 받는다. 제안된 두 종류의 광교환기 구조에 대한 해석적 분석과 시뮬레이션을 실시하였으며, 셀 손실률, 구성 소자의 복잡도, 요구되는 버퍼링 속도 관점에서 성능을 비교 분석하였다.

• Current Applied Physics
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• 제18권11호
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• pp.1458-1464
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• 2018

An improved method for the preparation of g-$C_3N_4$ is described. Currently, heating (> $400^{\circ}C$) of urea is the common method used for preparing the g-$C_3N_4$. We have found that sonication of melamine in $HNO_3$ solution, followed by washing with anhydrous ethanol, not only reduce the crystallite size of g-$C_3N_4$ but also facilitate intriguing electronic structure and photoluminescence (PL) properties. Moreover, loading of metal (Pt and Ag) nanoparticles, by applying the borohydride reduction method, has resulted in multicolor-emission from g-$C_3N_4$. With the help of PL spectra and local electronic structure study, at C K-edge, N K-edge, Pt L-edge and Ag K-edge by X-ray absorption spectroscopy (XAS), a precise mechanism of tunable luminescence is established. The PL mechanism ascribes the amendments in the transitions, via defect and/or metal states assimilation, between the ${\pi}^*$ states of tris-triazine ring of g-$C_3N_4$ and lone pair states of nitride. It is evidenced that interaction between the C/N 2p and metal 4d/5d orbitals of Ag/Pt has manifested a net detraction in the ${\delta}^*{\rightarrow}LP$ transitions and enhancement in the ${\pi}^*{\rightarrow}LP$ and ${\pi}^*{\rightarrow}{\pi}$ transitions, leading to broad PL spectra from g-$C_3N_4$ organic semiconductor compound.

• 한국식품영양학회지
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• 제27권1호
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• pp.105-111
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• 2014

미국인이 즐겨먹는 기능성 고추케찹과 한국산 고추케찹의 생리활성 특성을 비교하고, 한국산 고추케찹의 외국인 관능평가를 진행하여 고추케찹의 특성과의 상관관계를 분석하여 고부가 가치 고추가공품의 기초자료를 마련하고자 연구를 진행하였다. 미국산 고추케찹 4종과 한국산 고추케찹의 총당, 염도, 당도의 이화학적 분석과 ASTA 값, 총 캡사이시노이드, 총 카로티노이드, 총 페놀, 총 항산화력의 생리활성 성분을 분석하고, 관능평가를 실시하였다. 한국산 고추케찹은 미국 고추케찹보다 생리활성 성분이 모두 높게 나타났으며, 관능평가 결과, 미국 고추케찹에 비하여 단맛과 짠맛이 약하고, 종합적 기호도가 높은 것으로 평가되었다. 생리활성 성분과 관능평가 결과의 상관관계 분석을 통하여 ASTA 값, 총 캡사이시노이드, 총 카로티노이드 함량과는 통계적으로 서로 양(positive)의 상관관계를 갖는 것으로 분석되었고, 이 3가지 생리활성 성분은 종합적 기호도와 높은 상관관계가 있는 것으로 나타났다.

• 한국식품영양학회지
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• 제36권6호
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• pp.496-505
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• 2023

This study explored a method to enhance the drying process usability of local mangoes by producing foam-mat dried powder under varying drying temperatures (50, 60, 70℃) and foam thicknesses (3, 6, 9 mm). The drying process period ranged from 60 to 390 minutes based on the set conditions, with higher temperatures and thinner foams accelerating drying. Powder chromaticity (L^*,(L^*, a^*, and b^*) demonstrated a declining trend with increasing drying temperature and foam thickness, exhibiting notable variance in chroma values. The water absorption index varied significantly, between 3.08 to 4.24, under different drying conditions, although the water solubility index remained consistent across foam-dried samples. Powder moisture content ranged from 2.53% to 3.83%, with hygroscopicity escalating with temperature and foam thickness. Vitamin C structure was compromised during the hot air drying process, especially at temperatures above 60℃. Electronic nose analysis distinguished foam-dried powder from freeze-dried powder; however, a thicker foam yielded a scent profile closer to that of freeze-dried powder. The findings provide fundamental data on mango foam drying, which is expected to improve processing and storage tech for local mangoes.