주파수 합성기의 위상 잡음이 SFH/M-NCFSK 시스템에 미치는 영향

손종원,이준서,유흥균,박진수 한국전자파학회 2003 한국전자파학회논문지 Vol.14 No.7

본 논문에서는 SFH/M-NCFSK(slow frequency hopping/M-ary non-coherent frequency shift keying) 시스템을 대상으로 FH주파수 합성기에 위상 잡음이 통신 성능에 미치는 영향에 대해 주파수 편차라는 개념으로 새로이 연구하였다. Square-law 검출기를 이용한 비동기 FSK 복조 방식을 사용하고, FH 주파수 합성기의 위상잡음을 고려한 SFH 시스템에 대해 해석적 방법으로 심볼 오류 확률을 추하였다. 주파수 한성기의 위상 잡음 전력 스펙트럼 분포와 대응하는 표준주파수편차 (equation omitted)와 SFH/M-NCFSK 시스템의 호핑 주파수 간격에 따른 통신 성능을 분석하였다. 표준 주파수 편차가 약 4.0 Hz일 경우, SFH/2-NCFSK 시스템에서 호핑 주파수 간격이 1/T$_{h}$=30 일 때, Ps=$10^{-3}$을 만족하는 SNR은 약 13.4 dB이다. 이것은 위상 잡음이 없을 때보다 약 2.4 dB의 전력 손실이 발생한다. SFH/4-NCFSK와 SFH/8-NCFSK 시스템에서는 각각 약 2.8 dB와 2.6 dB치 전력손실을 가진다. 호핑 주파수 간격이 1/T$_{h}$=30 이하이면, error floor가 생겨서 SER 성능이 악화된다. 시뮬레이션에 치한 분석 결과를 제시하였고, 해석적 방법에 의한 분석 결과와 일치함을 확인하였다.하였다. This paper newly analyzes the effect of the phase noise in the frequency synthesizer on the performance of SFH/M-NCFSK system by standard frequency deviation(equation omitted) when noncoherent FSK demodulation of the square-law detector is considered. We derive the SER in the SFH system and analyze the effect of phase noise on the SFH/M-NCFSK system performance according to the hopping frequency spacing (1/T$\_$h/) and the variation of the standard frequency deviation (equation omitted). The required SNR is about 13.4 dB to meet Ps=10$\^$-3/ when the standard frequency deviation is about 4.0 Hz and the hopping frequency spacing (1/T$\_$h/) in the SFH/2-NCFSK system is 30. So, there is about 2.4 dB power penalty than the phase noise-free system. If the hopping frequency spacing 1/T$\_$h/ is under 30, the error floor may happen and SER considerably grows up. We show that the analytic results closely match with the simulation results.

影响中国奢侈品价格形成的因子研究

손종원,김춘수 한국국제회계학회 2009 국제회계연구 Vol.0 No.26

奢侈品消费在中国正处于蓬勃发展阶段。然而相对于国外的奢侈品消费者,中国的消费者大部分为年龄低于40岁的年轻人,而这一消费群体的最大特征为消费理念及消费方式的不理性。欧美发达国家消费者比较注重奢侈品的文化内涵,他们对名牌的理解更加深刻。而中国消费者过多地的注重奢侈品的货币价值,很少考虑到品牌的历史文化意义,以及是否和自身所追求的气质相符合,从而在购买的时候缺乏明确的选择性。因此,本文从中国奢侈品市场的结构分析入手,通过分析奢侈品的本质特征与奢侈品价格形成机制间的关系,归纳出了影响中国奢侈品价格形成的因子。分析结果,影响奢侈品价格形成的因子最终归结为沉淀在奢侈品上的历史、独特的品牌、传奇人物的力量、稀缺性以及手工艺等奢侈品的几点特性。即奢侈品的制造历史越悠久、奢侈品的品牌越独特、越是源于具有传奇色彩的历史名人、奢侈品的供给越是稀少、投入在奢侈品上的手工艺越精湛,该奢侈品的价格便越高。上述分析对非理性的奢侈品消费者进行理性消费将带来借鉴信息,同时该研究结果对奢侈品的制造商和销售商的消费市场细分化也会带来一定的借鉴意义。

析中國消費者環保和退貨行爲對電子企業的逆向物流和商業價値的影響

손종원,나승화 한국국제회계학회 2008 국제회계연구 Vol.0 No.22

本文旨在对中国电子产品消费者的环保行为及退货行为进行分类,继而分析其与电子产品的逆向物流及生产企业商业价值之间存在的结构关联性。 基于结构方程模型的实证分析结果整理如下。第一,消费者环保行为对退货行为没有直接的影响;第二,环保意识对环保行为和退货行为具有一定的影响;第三,环保法规和环保意识均对电子产品的逆向物流带来正面影响,但环保法规的影响不太明显;第四,产品质量和消费者竞争均对逆向物流会带来正面影响,但品质方面的影响更为明显;第五,消费者的环保行为和退货行为对企业商业价值均带来正面影响,但两者间的影响力差异不大;第六,电子产品的逆向物流量对生产企业的商业价值会带来较大的正面影响。 本文的研究意义在于探索出电子产品逆向物流的主要动因,为相关生产企业的绿色营销活动提供参考性建议 This study is to find out the trend classification of the eco-friendly act and the act of returning goods of Chinese customers, and a structural relation between the retro-direction physical distribution of electronic products and management outcome of the manufacturing industry. The results of an actual proof analysis used by a structural equation model are shown like this. First, It is shown that the eco-friendly actcustomers has no effect on the act of returning goods. Second, The eco-friendly mind of customers has a constant plus impact on the act of eco-friendly and returning goods. Third, Both eco-friendly protection law and eco-friendly mind have an meaningful plus on retro-direction physical distribution of electronic products. but there was a little effect of eco-friendly protection law. Fourth,psychological comparison of quality goods by customers has an meaningful plus effect on retro-direction physical distribution - a more effect by quality goods. Fifth, Both the eco-friendly act of customers and the act of returning goods have an meaningful plus on the management outcome of the manufacturing industry. but there is little difference each other. Finally, The retro-direction physical distribution of electronic products has a very meaningful influence on management outcome of the manufacturing industry. This study is a very meaningful by showing the positively strategically proposal through surveying main motive of the retro-direction physical distribution of electronic products.

Session 4 Distribution Science III

孫鐘遠,金鎭圣,Park,Soo-Yong,Kim,Dho-Heon,Kim,Sang Douk 한국유통과학회 2008 한국유통과학회 학술대회 논문집 Vol.2008 No.-

경남지역 학교 급식조리실 개선 전후 환기성능 평가

손종원,김태형,하현철,김병훈,Kritana Prueksakorn 한국산업보건학회 2024 한국산업보건학회지 Vol.34 No.1

Objectives: Many cases of lung cancer have been reported by school kitchen workers as occupational cancer. Twenty-eight schools in Gyeongsangnam-do Province were selected to evaluate the effect of improved kitchen ventilation systems. Ventilation characteristics before and after renovation were compared and design techniques were identified. Methods: In the design stage for kitchen ventilation systems, expert intervention was used to improve the designs. Ventilation characteristics and air quality were evaluated before and after the renovations. Hood face velocity and fan flow rate were measured and the smoke visualization technique was used to evaluate the capability of protecting worker’s breathing zone. The concentrations of PM0.3 were measured at points not adjacent to cooking equipment because these concentrations fluctuate greatly. Results: Mean hood face velocity increased from 0.29 m/s before renovation to 0.7m/s after renovation. The concentrations of PM0.3 showed a roughly 95% reduction. Concentrations of CO showed more than a 75% reduction. Smoke visualization showed greater protection of workers’ breathing zone. Conclusions: Advanced design techniques for school kitchen ventilation systems were applied to renovate old kitchen ventilation systems. The performance of the new kitchen ventilation systems was nearly excellent. Further improvement of design techniques is still needed, however.

리튬이온배터리의 열폭주 화재 위험도 예측

손종원,최한빛,정수빈,강두호,최돈묵 한국화재소방학회 2024 한국화재소방학회 학술대회 논문집 Vol.2024 No.1

메티실린 내성 황색 포도알균에 의한 연조직 및 골 감염에 대한 전환요법으로서의 경구 Rifampin의 유용성

손종원,김신우,하상우,이응갑,정덕원,장현하,이종명,김능수 대한감염학회 2005 Infection and Chemotherapy Vol.37 No.6

Background : Rifampin is sometimes used in combination with other anti-staphylococcal agents to treat methicillin-resistant Staphylococcus aureus (MRSA) infections but few reports are available about the usefulness of rifampin against MRSA infections, especially in soft tissue and bone infections. Thus, we evaluated the efficacy of rifampin as switch therapy for soft tissue and bone infections caused by MRSA and assessed the risk factors for treatment failure. Materials and Methods : We retrospectively studied 44 patients who had soft tissue and bone infections caused by MRSA and were treated with rifampin in combination or as monotherapy as switch therapy from January 2001 to September 2004. Results : The mean age of the subjects was 50.2 years and the number of male and female were 34 and 10, respectively. Median duration of rifampin use was 32 days and 25% of the patients had artificial prostheses. Thirty one patients (79.5%, 31/39) were cured with parenteral glycopeptide followed by rifampin in combination or as monotherapy. Eight patients (8/39) recurred after the completion of treatment. The presence of hip prosthesis was the only significant risk factor (P= 0.027) in multivariate logistic regression test. Rifampin was tolerable in all cases. Conclusion : Rifampin as switch therapy for soft tissue and bone infection caused by MRSA was effective in 79.5% (31/39) of sujects. The treatment failure seems to be associated with unremovable infected prosthesis. 목 적 : 메티실린 내성 황색 포도알균에 의한 연조직 및 골 감염의 치료 시 glycopeptide약물의 정주 요법에 이은 경구 항생제로의 처방 전환이 요구되는 경우가 많으나 마땅한 경구 약제의 선택이 어려운 실정이다. 이에 경구 rifampin을 메티실린 내성 황색 포도알균에 의한 연조직 및 골 감염에 사용하여 치료한 경우를 분석하여 그 유용성 정도와 실패한 경우 실패의 위험인자를 알아보고자 하였다. 재료 및 방법 : 2001년 1월부터 2004년 9월까지 메티실린 내성 황색 포도알균에 의한 연조직 및 골 감염 환자를 대상으로 rifampin을 그 치료 목적으로 사용한 44명의 환자를 의무 기록과 X선 사진을 통해 후향적으로 분석하였다. 기초 자료를 분석하였고 감염이 재발하여 치료 실패로 판정된 환자들에 대해 치료 실패의 원인이 될 만한 주요 변수에 대한 Chi-square 검증과 로지스틱 회귀분석을 시행하였다. 결 과 : 치료 후 재발은 20.5% (8/39)였으며 재발 예와 사망에 대한 위험요소에 대한 단변량 분석에서 고관절 보형물이 있는 경우 흔하였으나 통계적 차이에는 미치지 못하였다(P=0.065). 고관절 보형물 외에 동반된 질환들, 쇼크의 동반, 균혈증의 동반, 경구 시 ciprofloxacin과 rifampin의 병합 복용 기간 등을 혼란 변수로 사용한 다변량 로지스틱 회귀분석에서는 고관절 보형물 만이 통계적으로 유의하였다(P=0.044). 결 론:메티실린 내성 황색 포도알균에 의한 연조직 및 골 감염에 rifampin과 다른 약제를 병합하여 치료하는 경우 재발은 적었다. 치료 실패의 경우는 고관절 부위 감염과 같이 보형물을 쉽게 제거하기 어려운 상황과 관계되는 것을 보여준다.

변동환율제도하의 위안화 환율변동과 벤처기업의 재무성과 간 상관관계 연구

손종원,장석주,나승화,Sun, Zhong-Yuan,Chang, Seog-Ju,Na, Seung-Hwa 한국벤처창업학회 2010 벤처창업연구 Vol.5 No.1

On July 21st in 2005, People's Bank of China (PBOC) turned the currency peg against the U.S. dollar into managed currency system based on a basket of unnamed currencies under China's exchanged rate regime. This change means that China's enterprises are not free from currency fluctuations. The purpose of this study is to analyze the relations between Renminbi fluctuations in the floating exchange rate and financial results of venture companies. The process and outcomes of this study are as follows, First, in order to measure the financial results of venture companies, I choose venture companies in Shandong Province listed on the Shanghai Stock Exchange (SSE) at random and several quarter financial sheets according to safety ratios, profitability ratios, growth ratios, activity ratios. Second, I arrange the daily Renminbi exchange rate data announced from July 21st, 2005 to December 31st, 2008 by PBOC into the quarterly data. Third, in order to confirm the relations between Renminbi fluctuations and financial results of venture companies, I carry out Pearson's correlation analysis. As a result, the revaluation of the Chinese Renminbi has weakly negative effects on debt ratio, total assets turnover ratio and equity turnover ratio in statistics. But the revaluation of the Chinese Renminbi is not related to other financial index in statistics. The result of this study is that the revaluation of the Chinese Renminbi has little influence on the export and import of Chinese venture companies and certifies the fact that Chinese venture companies have much foreign currency assets. In addition to avoid the currency exposure risk, this study shows the effective method about currency exposure risk which adjusts proportion of Renminbi to foreign currency.

플라즈마 원자층 증착 기술의 최근 동향 및 이슈

손종원 한국표면공학회 2022 한국표면공학회 학술발표회 초록집 Vol.2022 No.6

상가의 권리금 산정을 위한 공인중개사의 역할제고에 관한 연구

손종원,이재원,이상엽 한국부동산학회 2019 不動産學報 Vol.77 No.-

1. CONTENTS (1) RESEARCH OBJECTIVES This study aims to explore the function of licensed real estate agent for the foregift assessment in store transaction. It intends to identify the factors affecting the foregift of store and define the weight level of factors towards the feasible improvement of existing foregift legislation. (2) RESEARCH METHOD The factors affecting the foregift are defined by the prior research and preliminary survey by experienced licensed real estate agent in store transaction. And the weight of factors classified by foregift attribute have been developed based on the AHP methodology by the survey of 60 experts specialized in store brokerage. Research finding indicates that the weight of factors affecting the foregift are defined in the 4 categories and associated 12 factors are determined. It is noteworthy that the location and size of the store are more weighted than ever though other factors with business characteristics are less. Especially the real estate agent is regarded more important than lessee or lessor in brokerage category. 2. RESULTS This study proves that the licensed real estate agent should have the active role for foregift. assessment in store transaction. It will help avoid the potential conflict towards the secure brokerage market and the estimation of fair foregift. 3. KEY WORDS •store, real estate licensed real estate agent, foregift, brokerage attribute, AHP