The purpose of this paper is to analyze factors affecting the net income of regional and industrial fisheries cooperatives in South Korea using panel data. This paper utilizes linear or GLS regression models such as pooled OLS model, fixed effects model, and random effects model to estimate affecting factors of the net income of regional and industrial fisheries cooperatives. After reviewing various tests, we eventually select random effects model. The results, based on panel data between 2013 and 2018 year and 64 fisheries cooperatives, indicate that capital and area dummy variables have positive effects and employment has negative effect on the net income of regional and industrial fisheries cooperatives as predicted. However, debt are opposite with our predictions. Specifically, it turns out that debt has positive effect on the net income of regional and industrial fisheries cooperatives although it has been increased. Additionally, this paper shows that the member of confreres does not show any significant effect on the net income of regional and industrial fisheries cooperatives in South Korea. This study is significant in that it analyzes the major factors influencing changes in the net income that have not been conducted recently for the fisheries cooperatives by region and industry.

Squid is a popular seafood in Korea. However, since the 2000s, the squid production has been declining. The unstable supply of the squid products may cause price fluctuations of fresh and chilled squid. These price fluctuations may be relatively more severe than them of other commodities, because the fresh and chilled squid can not be stored for a long period of time. Thus, this study analyzes the structural characteristics of price volatility and price asymmetry of fresh squid based on off-diagonal GARCH model. Data used to analysis of this study are daily wholesale and retail prices of fresh squid from January 1, 2006 to December 31, 2016 provided in the KAMIS. As theoretical approaches of this study, first of all, the stability of the time series is confirmed by the unit root test. Secondly, the causality between distribution channels is checked by the Granger causality test. Thirdly, the VAR model and the off-diagonal GARCH model are adopted to estimate asymmetry effect and price volatility spillover between distribution channels. Finally, the stability of the model is confirmed by multivariate Q-statistic and ARCH-LM test. In conclusion, fresh squid is found to have shock and volatility spillover between wholesale and retail prices as well as its own price. Also, volatility asymmetry effect is shown in own wholesale or retail price of fresh squid. Finally, this study shows that the decrease in the fresh squid retail price of t-1 period than the increase in the t-1 period has a greater impact on the volatility of the fresh squid wholesale price in t period.

목적: 본 연구는 안경렌즈로 인하여 유발된 조절자극에 따른 동공간의 거리 변화를 알아보고자 하였다. 방법: 본 연구는 시력장애를 유발하는 안질환이 없는 성인 남녀 16명을 대상으로 실시하였다. 완전교정한 상태에서 시험테를 이용하여 눈앞에 -1.00D, -1.50D, -2.00D, -2.50D, -3.00D 렌즈를 부가한 상태에서 각각의 단계를 카메라로 촬영하여 사진 상의 PD변화를 측정하였다. 가입된 렌즈의 광학중심과 동공중심과의 차이로 생기는 프리즘은 프렌티스 공식을 사용하여 보정한 후 분석하였다. 결과: 완전교정한 상태에서 시험테를 이용하여 눈앞에 –1.00D, -1.50D, -2.00D, -2.50D, -3.00D 렌즈를 부가한 상태에서 동공간의 평균 거리는 각각 61.86±2.40mm, 61.73±2.44mm, 61.51±2.43mm, 61.34±1.67mm, 61.27±1.88mm로 조절자극이 증가할 수록 동공간의 거리는 감소하는 것으로 나타났다. 마이너스렌즈를 가입하지 않은 상태로부 터 3D 조절자극에 대하여 감소된 동공간의 거리 평균은 약 0.60±0.49mm이었다. 결론: 이상의 결과와 같이 안경렌즈로 유발된 조절자극에 의한 조절성폭주로 동공간의 거리가 감소하는 것을 확인할 수 있었다. 추후 조절반응에 따른 동공간의 거리 변화를 통해 동공간의 거리와 크기의 변화에 대하여 연구할 필요성이 있다고 생각된다.

This study aims to analyze causalities among Hairtail prices by distribution channel using a vector autoregressive model. This study applies unit-root test for stability of data, uses Granger causality test to know interaction among Hairtail Prices by distribution channel, and employes the vector autoregressive model to estimate statistical impacts among t-2 period variables used in model. Analyzing results of this study are as follows. First, ADF, PP, and KPSS tests show that the change rate of Hairtail price by distribution channel differentiated by logarithm is stable. Second, a Granger causality test presents that the producer price of Hairtail leads the wholesale price and then the wholesale price leads the consumer price. Third, the vector autoregressive model suggests that the change rate of Hairtail producer price of t-2 period variables statistically, significantly impacts change rates of own, wholesale, and consumer prices at current period. Fourth, the impulse response analysis indicates that impulse responses of the structural shocks with a respectively distribution channel of the Hairtail prices are relatively more powerful in own distribution channel than in other distribution channels. Fifth, a forecast error variance decomposition of the Hairtail prices points out that the own price has relatively more powerful influence than other prices.

This study suggests new approach to identify core technologies through patent analysis. Specially, the approach applied data mining technique and multi-criteria decision making method to the co-classification information of registered patents. First, technological interrelationship matrices of intensity, relatedness, and cross-impact perspectives are constructed with support, lift and confidence values calculated by conducting an association rule mining on the co-classification information of patent data. Second, the analytic network process is applied to the constructed technological interrelationship matrices in order to produce the importance values of technologies from each perspective. Finally, data envelopment analysis is employed to the derived importance values in order to identify priorities of technologies, putting three perspectives together. It is expected that suggested approach could help technology planners to formulate strategy and policy for technological innovation.

This paper proposes an approach to analyzing the relationship between technology and services, and to identifying promising service areas for technology-based firms with the analysis of business model (BM) patents. First, BM patents and technology patents are collected and classified into their relevant categories, respectively. Second, patent citation analysis is conducted to analyze the linkage and impacts between each technology and service field at macro level. Third, as a micro level analysis, patent co-classification analysis is employed to identify the interrelationships among specific technology and service areas. Finally, the promising service areas for technology-based firms seeking service areas for diversification is investigated with portfolio analysis. The working of the proposed approach is provided with the help of a case study of IT and mobile services. The proposed approach could guide and help managers of technology-based firms to discover the opportunity of the diversification to new areas in emerging service fields.

옥수수 섬유질을 수분함량 20과 30%, 스크루 회전속도 150과 200 rpm으로 조절하고 배럴온도 160oC, 원료 사입량을 120 g/min으로 고정하여 압출성형하였 때, 압출성형 조건이 옥수수 섬유질의 화학적 특성(일반성분, 환원당 함량, 항산화 활성, 효소 반응성), 비기계적 에너지 투입량, 물리적 특성(팽화율, WSI, WAI)에 미치는 영향을 연구하였다. 압출성형에 의하여 환원당과 전분, 항산화 활성, 효소반응성, WSI가 증가하였다. 특히 수분함량 20%에서 증가폭이 더 컸다. 효소반응성은 Viscozyme L에 대한 반응성이 더 컸으며, 특히 수분함량 20%, 스크루 회전속도 200 rpm에서 효소반응성이 가장 높았다. 수분함량이 20에서 30%로 증가할 때 비기계적 에너지 투입량은 감소하였으며, 직경 팽화율과 WSI도 감소하였으나, 비길이 및 WAI는 증가하였다. 본 연구에서 수분함량이 압출성형 옥수수 섬유질의 중요한 변수로 작용하는 것을 알 수 있었다.

Liquefied-wood polymer composite was prepared and mechanical properties was evaluated to develop potential utility of liquefied wood. The liquefied wood was made from waste wood and chemical modified with acetic anhydride and maleic anhydride (MA), phtalic anhydride (PA). The composite sheet was prepared from modified liquefied-wood and polymer(PE). The mechanical, chemical and microscopical properties composite sheet were investigated. The results were summarized as follows, 1. The tensile strength was increased and breaking elongation of composite sheet was decreased with the time of acetylation and the dosage of MA. 2. The Young's modulus of composite sheet was gradually decreased with the dosage of PA. 3. The peak intensity of 1737cm-1 in FT-IR spectra of chemical modified liquefied woods was increased. 4. The dispersity of liquefied woods with PE was improved with chemical modification.

Sulfonamides, a therapeutically important group of antimicrobial drugs, are widely used to treat and prevent the acute systemic and skin infections in dairy cattle. They also pose an economic hazard through inhibition of growth of dairy starter cultures. This study was carried out to compare four screening methods for detection of sulfamethazine in milk and determine the positive milk sample by HPLC method. Sulfamethazine was used to spike at five levels of sulfamethazine. The Lac-Tek test and CharmII test were also consistent better than TTCII test and Delvo SP test in sulfamethazine detection. Analysis probabilities of obtaining a positive response with TTCII test and Delvo SP test assay at 50 ppb sulfamethazine level in milk samples were only 14%, 42% each. Whereas using the Lac-Tek test and CharmII test would have resulted in 100% identification of the five levels. Determination of sufamethazine using the HPLC method in the spiked milk were 10.64, 19.30, 30.76, 38.83 and 50.23 ppb, respectively.

본 연구에서는 지식공유와 지식관리시스템에 관한 이론과 선행연구를 통하여 해운 항만 공공부문과 해운기업을 대상으로 지식관리시스템 사용과 지식공유 의도에 영향을 주는 요인들을 추출하여 그 요인들의 상호 영향관계를 살펴보았다. 총 7개의 가설을 검증한 결과, 먼저 지식공유 의도의 영향요인들 중에서 최고 경영층의 지원, 자기 가치감, 신뢰가 지식공유 의도에 영향을 미치는 것으로 확인되었고, 또한 보상제도와 지식관리시스템의 사용과 관계, 지식공유 의도와 지식관리시스템 사용과의 관계 통계적으로 유의한 결과로 나타났다. 본 연구 결과는 앞으로 지식관리시스템 사용과 관련된 연구에 있어서 지식공유 의도의 영향력에 대학 실증적 근거로 제시될 수 있을 것이다. 또한 지식관리 시스템을 도입 사용하고 있는 기업의 실무자들에게 현재 자신들의 지식관리시스템 사용 현황을 재진단하고 문제점을 짚어봄으로써 향후 지식관리시스템을 통한 지식공유를 촉진하기 위한 방안을 모색하는데 기초 자료로 활용될 수 있을 것이다.

Introduction : The obesity can be a serious problem that frequently induces a great deal of complications. Numerous methods have been applied to control obesity and one of them is aromatherapy. This study is a first attempt to verify the effect of the inhalation of essential oils on the obesity. This study was designed as the animal study, because the human study has many socio-psycho compounding variables. Methods : This study was designed to verify the effect of inhalation of essential oils on the body weight, feeding amount, food efficiency rate and serum leptin of SD rats. The research design is repeated measures over time, equivalent control group pretest-posttest experimental design. The subjects of this experiment were obese SD rats. They were allocated to one of four groups, the Fennel G., the Patchouli G., the Bergamot G. and control G. The experimental treatment was the inhalation of aromatherapy essential oils (Fennel, Patchouli, Bergamot). The experimental treatment was applied two times a day for 10 minutes each during 8 weeks. To evaluate the effect of inhalation of essential oils, the body weight, feeding amount and food efficiency rate was measured every week and serum leptin was measured before and after the experiment. The collected data was analyzed by repeated measures of ANOVA, Greenhouse-Geisser, ANOVA, Tukey, Kruskal Wallis test and χ²- test with SPSS program. Results : The results were as follows. The subjects of this study was 84 obese SD rats(40 males and 44 females). The means of age and body weight in obese SD rats were 30 weeks and 344.6g. The food efficiency rate was significantly lower in the Patchouli group and Fennel group than in Bergamot group and control group(P=.000). No significant group effects were found, but significant time effects were found for SD rat's body weight, feeding amount and serum leptin. Conclusions : In conclusion, these findings indicate that the inhalation of essential oils could be effective in lowering the food efficiency rate. 2)