Jet騷音이 蝸牛 Corti 器에 미치는 影響에 관한 實驗的 硏究

趙容範 최신의학사 1984 最新醫學 Vol.27 No.12

부산 경남지역 주부들의 혼례음식 인지도에 대한 조사연구

조용범,김경묘 (사)한국조리학회 2007 한국조리학회지 Vol.13 No.2

This study was carried out to survey the degree of the perception and necessity of wedding food prepared by housewives. The participants of the survey were 331 housewives lived in Busan and Kyungnam area. The findings could be summarized as follows:The housewives lived in Busan and Kyungnam area had evaluated the necessity of wedding foods, Paebaek foods or Yedan foods. The respondents of 36.6% answered that they will order wedding foods from specialists, whereas 28.7% said that they will prepare them by themselves. More than half of the respondents(56.2%) thought that current wedding foods were prodigal and have to be done in thrifty manner. Broadly 46.8% of the respondents considered that the ritual practices of wedding foods will decrease steadily. A conclusion was that lots of participants had a negative view of wedding foods and pointed out the necessity of developing them to reflect traditional wedding customs with economic costs. 본 연구는 우리의 전통 음식 중 전통 혼례 음식을 발전시키기 위한 것으로 부산경남 지역 주부들의 혼례 음식에 대한 인지도를 조사한 것이다. 응답지 331부를 회수하여 분석한 결과는 다음과 같다.1. 부산 거주 주부들이 전체의 70.4%, 경남 지역 주부들이 29.6%를 차지하였으며, 부산 지역 주부들이 경남 지역 주부들에 비해 전반적으로 혼례 음식, 폐백 음식, 예단 음식의 필요성에 대해서 높게 평가하는 것으로 나타나 거주 지역에 따라서 혼례 관련 음식의 필요성에 통계적으로 유의적인 차이가 있는 것으로 나타났다.

한식당 이용고객의 서비스품질 평가에 관한 연구 - 삼겹살 전문점을 중심으로 -

조용범 韓國食生活文化學會 2005 韓國食生活文化學會誌 Vol.20 No.5

무선 링크에서 TCP 처리율 향상을 위한 Enhanced Snoop 프로토콜

조용범,원기섭,조성준,Cho Yong-bum,Won Gi-sup,Cho Sung-joon 한국통신학회 2005 韓國通信學會論文誌 Vol.30 No.6b

Snoop 프로토콜은 유무선이 혼재된 망에서 무선 링크에서 발생하는 TCP 패킷 손실을 효과적으로 보상하여 TCP 처리율(throughput)을 향상시킬 수 있는 효율적인 프로토콜이다. 하지만, 무선 링크에서 연집한(burst) 패킷 손실이 발생하는 경우에는 지역 재전송을 효과적으로 수행하지 못하여 효율이 떨어진다는 문제점이 있다. 본 논문에서는 이러한 Snoop 프로토콜의 단점을 개선한 Enhanced Snoop(E-Snoop) 프로토콜을 제안한다. E-Snoop 프로토콜은 Snoop 프로토콜과 같이 중복 ACK 패킷 수신과 지역 재전송 타이머 만료에 의해 무선 링크에서의 패킷 손실을 인지할 수 있을 뿐만 아니라, new ACK 패킷 수신을 통해서도 패킷 손실을 인식할 수 있도록 설계되었다. 따라서, 무선 링크상의 연속한 패킷 손실을 빨리 인지하고 신속한 지역 재전송을 수행함으로써 TCP 처리율을 향상시킬 수 있다. 컴퓨터 시뮬레이션 결과 E-Snoop 프로토콜은 기존의 Snoop 프로토콜보다 TCP 처리율을 더 효율적으로 향상시킬 수 있음을 확인할 수 있었고, 특히 패킷 손실율이 높은 무선 링크에서 더 높은 성능 향상을 얻을 수 있었다. Snoop protocol is one of the efficient schemes to compensate TCP packet loss and enhance TCP throughput in wired-cum-wireless networks. However, Snoop protocol has a problem; it cannot perform local retransmission efficiently under the bursty-error prone wireless link. In this paper, we propose Enhanced Snoop(E-Snoop) protocol to solve this problem of Snoop protocol. With E-Snoop protocol, packet losses can be noticed by receiving new ACK packets as well as by receiving duplicate ACK packets or local retransmission timeout. Therefore, TCP throughput can be enhanced by fast recognition of bursty packet losses and fast local retransmissions. From the simulation results, E-Snoop protocol can improve TCP throughput more efficiently than Snoop protocol and can yield more TCP improvement especially in the channel with high packet loss rates.

Nakagami-m 페이딩 채널에서 FSMC 모델에 의한 무선 통신시스템의 성능 분석

조용범,노재성,조성준 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.5

본 논문에서는 Nakagami-m 페이딩 채널을 Finite-State Markov Channel (FSMC)로 모델링하고, 채널 상태 변화에 따른 통신 시스템의 성능을 분석하였다. 고려한 FSMC 모델에서는 수신 신호의 신호 대 잡음 전력비를 유한개의 구간으로 나눠 각각의 구간을 Markov 체인의 상태로 대응한다. 각 상태는 무기억 이진 대칭 통신로로 가정하고, 한 상태에서 다른 상태로의 천이는 Markov 천이를 따른다고 가정한다. 수치 해석을 통해 각 상태에 있어서의 평균 심볼 오율, 정상 상태 확률 그리고 상태 천이 확률을 구하여 FSMC 모델을 구성하였고, 상태 천이 지수를 변경함으로써 여러 페이딩 환경을 FSMC 모델로 나타낼 수 있음을 확인하였다. 상태 천이 지수가 클 경우인 빠른 페이딩 채널에서는 채널이 i.i.d. 특성을 나타내게 되며, 상태 천이 지수가 작을 경우인 느린 페이딩 채널은 인접한 상태로의 천이만 발생하는 간단한 FSMC 모델로 표현될 수 있음을 확인하였다. 마지막으로 제안한 FSMC 모델의 응용 예로써, 여러 채널 환경에서 랜덤 에러 정정 부호의 부호화 이득의 차이를 컴퓨터 시뮬레이션을 통해 비교, 분석하였다. In this paper, we represent Nakagami-m fading channel as finite-State Markov Channel (FSMC) and analyze the performance of wireless communication system with varying the fading channel condition. In FSMC model, the received signal's SNR is divided into finite intervals and these intervals are formed into Markov chain states. Each state is modeled by a BSC and the transition probability is dependent upon the physical characterization of the channel. The steady state probability and average symbol error rate of each state and transition probability are derived by numerical analysis and FSMC model is formed with these values. We found that various fading channels can be represented with FSMC by changing state transition index. In fast fading environment in which state transition index is large, the channel can be viewed as i.i.d. channel and on the contrary, in slow fading channel where state transition index is small, the channel can be represented by simple FSMC model in which transitions occur between just adjacent states. And we applied the proposed FSMC model to analyze the coding gain of random error correcting code on various fading channels via computer simulation.

김치분말 첨가가 김치스낵류의 맛과 품질에 미치는 영향

조용범 한국외식경영학회 2004 외식경영연구 Vol.7 No.3

Five different Kimchi Snack dough with 2%, 4%, 6%, 8% and none of Freeze-Dried Kimchi Powder(FDKP) respectively were fried at the temperature of 170℃ for two minutes. Sensuous Evaluation showed that 4% FDKP snack revealed highest overall preference with nutty taste. The volatile substance of the chosen FDKP snack was analyzed with Automatic Thermal Desorber and total 26 ingredients were separated. They were thirteen kinds of aldehyde, three kinds of sulfide, one kind of ketone, acid, terpene respectively, and seven other ingredients. The highly correlated ingredients were analyzed with SIM and the correlation coefficient was 0.97, and which explains that the above mentioned ingredients work on the smell of FDKP snack.Conclusively, 4% FDKP did not show any significant difference from the controlled snack. Although 6% FDKP changed and increased the color, hotness, and Kimchi taste, 4% FDKP snack showed overall preference with nutty taste through GC/MS and sensuous Evaluation, which was chosen as the optimal.

First-principle Study for More Accurate Optical and Electrical Characterization of Ge1-xSnx Alloy for Si and Group-IV Device Applications

조용범,조성재,박병국,James S. Harris, Jr. 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.5

Ge is on increasing demand in the advanced Si-compatible high-speed integrated circuits due to its high carrier mobilities. In particular, its hole mobility is much higher than those of other group-IV and III-V compound semiconductor materials. At the same time, Ge has the local minimum at the Γ valley, which enables the utilization for optical applications. The fact that Ge becomes a direct-bandgap semiconductor material by applying tensile strain can be a good merit in obtaining higher spontaneous radiation probability. However, engineering the electronic structure of Ge by external mechanical stress through stressors with different thermal expansion coefficients might require a complicated set of processes. Efforts were made to turn it into a direct-bandgap one by incorporating Sn. Carrier mobilities are further enhanced when Sn is substitutionally incorporated into the Ge matrix. Thus, advantageous features are expected in improving both optical and electrical performances. Furthermore, the small bandgap energy and bandgap tunability make Ge1-xSnx alloy a promising material for components making up the optical interconnect on Si platform including optical source of near-infrared wavelength. In this work, we study the electrical and optical characteristics of Ge1-xSnx alloy as a function of Sn content. To achieve this goal, ab initio calculations of energy-band structures of Ge1-xSnx with different Sn fractions have been carried out based on linearized augmented plane wave (LAPW) method with modified Becke-Johnson potential model for more accurate bandgap energy. Then, a novel coding method has been adopted for more reliable overall band structures. The minimum Sn content required for direct- and indirect-bandgap material transition of Ge1-xSnx, electrical and optical energy bandgaps to investigate the bandgap tunability, as well as effective masses, have been extracted as a function of Sn content. The transition point was found to be 6.9% and succinct reductions of effective masses of electron and hole have been confirmed.

소간세포암의 치료 : 간절제술과 경피적에탄올주입술의 치료 성적 비교

조용범,김윤준,윤정환,이효석,서경석,이건욱 대한외과학회 2004 대한외과학회 학술대회 초록집 Vol.2004 No.10

Metabolic Changes in Acute Stress Conditions

조용범 한국정맥경장영양학회 2013 한국정맥경장영양학회 학술대회집 Vol.2013 No.-

Lipopolysaccharide로 자극한 RAW264.7 대식세포에서 소리쟁이 뿌리 추출물 분획의 Nitric Oxide 생성억제효과

조용범,권남우,김재연,정소희,이문순 한국약용작물학회 2018 한국약용작물학술대회 발표집 Vol.2018 No.10

Background : In ancient, roots of Rumex crispus, called wooi-daehwang, were used for various symptoms and diseases like cough, phlegm, bronchitis and hepatitis, caused inflammatory. As a part of ongoing research to elucidate and characterize anti-inflammatory nutraceuticals, solvent-partitioned fractions from R. crispus root were tested for their ability to suppress inflammation. In this study, NO synthesis inhibitory activity of solvent-partitioned fractions from R. crispus root on LPS-stimulated RAW264.7 mouse macrophages was evaluated. Methods and Results : The EtOH extracts were suspended in water. The aqueous layer was further partitioned in diethylether, ethylacetate and n-butanol, sequentially. RAW264.7 cells were seeded onto 96-well plates, and cells were allowed to adhere for 6 h and then were pretreated with the R. crispus root extracts for 24 h. Cellular nitric oxide (NO) production was stimulated by adding lipopolysaccharide (LPS). Absorbance was measured at 520 ㎚ by microplate reader. NO synthesis inhibitory activity potential of these fractions was evaluated by assessing NO production by LPS-stimulated RAW264.7 cells in the presence and absence of the solvent-partitioned R. crispus root fractions. NO synthesis inhibitory activity of diethylether fraction diluted in 50 ㎍/㎖, 25 ㎍/㎖, 12.5 ㎍/㎖, 6.25 ㎍/㎖, 3.125 ㎍/㎖ was 79.2%, 70.9%, 59.5%, 16.1%, and 11.8%, respectively. And NO synthesis inhibitory activity range of another fractions, EtOAc, n-BuOH and aqueous layer, were 0 - 30.2%, 0 - 20.1% and 3.8 - 22.4%, respectively. Conclusion : From the above results, it showed that diethylether fraction have strong NO synthesis inhibitory activity, it was suggested that R. crispus root have NO synthesis inhibitory effects. R. crispus root possesses anthraquinones, such as chrysophanol, parietin, and anthrones etc. According to previous studies, R. crispus semen extract has analgesic and hepatoprotective effect as anti-inflammatory, and extract of R. napalensis has cyclooxygenase (COX)-2, COX-1 inhibitory and free radical scavenging effect. Our present study has shown that R. crispus root extracts anti-inflammatory effects probably by suppressing iNOS expressions, and resulting in the inhibition of NO synthesis.