알코올 전 처리와 블랜칭이 포장 절편 마의 품질보존에 미치는 영향

송기현,고의석,김찬우,심원철,김재능 한국포장학회 2015 한국포장학회지 Vol.21 No.3

Position effect based on pyrene core for OLED emitters

송기현,이하윤,정효철,강석우,조민진,박종욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0

Sky Blue emitters based on a pyrene core have been successfully synthesized by substitution with triphenylamine side group in the 1,6 or 2,7 positions. There are larger red shifts in the UV-visible absorption and PL spectra of the synthesized 1,6-substituted derivative compared to the 2,7-substituted derivative. When the synthesized compounds were used as emitting layers in non-doped OLED devices, a related trend was observed in their optical properties. In particular, the OLED device containing the 2,7-substituted derivative was found to exhibit excellent characteristics, with maximum EL emission at 467nm, sky blue emission with CIE coordinates of (0.12, 0.14), and external quantum efficiency of 2.87%.

Synthesis of Self-Dipersion Synergists for Inkjet Ink Applications

송기현,강석우,이중헌,박종욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

기존 안료에 친수성 작용기를 적용시키는 방법으로, 새로운 자가-분산형 시너지스트 4종을 합성하였다. 합성한 4종의 시너지스트는 CUKY-11, CUKY-12, CUKY-41, CUKY-43으로, 기존 안료로 사용한 Pigment Yellow 74, Pigment Yellow 139, Pigment Yellow 150 보다 용해도가 크게 향상되었다. 그리고 CUKY-11을 시너지스트로 사용하여 수성 안료 잉크 제조한 결과 분산성 및 저장성이 개선되는 것을 확인하였다.

An On-line Algorithm to Search Minimum Total Error for Imprecise Real-time Tasks with 0/1 Constraint

송기현 한국멀티미디어학회 2005 멀티미디어학회논문지 Vol.8 No.12

The imprecise real-time system provides flexibility in scheduling time-critical tasks. Most scheduling problems of satisfying both 0/1 constraint and timing constraints, while the total error is minimized, are NP complete when the optional tasks have arbitrary processing times. Liu suggested a reasonable strategy of scheduling tasks with the 0/1 constraint on uniprocessors for minimizing the total error. Song et al suggested a reasonable strategy of scheduling tasks with the 0/1 constraint on multiprocessors for minimizing the total error. But, these algorithms are all off-line algorithms. On the other hand, in the case of on line scheduling, Shih and Liu proposed the NORA algorithm which can find a schedule with the minimum total error for a task system consisting solely of on-line tasks that are ready upon arrival. But, for the task system with 0/1 constraint, it has not been known whether the NORA algorithm can be optimal or not in the sense that it guarantees all mandatory tasks are completed by their deadlines and the total error is minimized. So, this paper suggests an optimal algorithm to search minimum total error for the imprecise on-line real-time task system with 0/1 constraint. Furthermore, the proposed algorithm has the same complexity, , as the NORA algorithm, where N is the number of tasks.

디지털시대의 호텔 인적자원 계발 연구

송기현 관광경영학회 2001 관광경영연구 Vol.13 No.-

Digital mans a method of data processing in the form of numbers. Today the entire world is undergoing profound transformations brought about by digitalization, new information and communication technologies, and widespread use of computers. This is a so-called digital age, which is witnessing massive changes brought by globalization such as more powerful civil society, the rise in win's social status and more common phenomena of pursuit of pleasure. In order to cope with these enormous challenges triggered by new technologies, the companies are continuously expected to reform their human resource management. Without exception, the hotel industry is trying to promote expertise of personnel management. The recent trends and conditions for personnel management in the hotel industry are to find more diverse ways of recruitment and retainment of qualified human resources, to transform the pay system form rigidity into a new and flexible one such as performance-related pay system, to make labor-management relations more cooperative, to create more open and democratic working atmosphere. In the process of implementing innovation and reform, tackling challenges in the digital age, above all, the hotels should try to cultivate originality and creativity of their workers harboring more generous attitude towards differences among workers and some failures made by them. Secondly, the hotel industry should foster well-educated human resources with expertise who can share and skillfully utilize new information and knowledge, thus contributing to the company making a good profit. If the hotels are to secure more competent workers with expertise, they should respect each workers individuality and provide a good atmosphere where the workers can cultivate their originality and study themselves. And thirdly, the hotels should nurture highly-qualified workers who can even make up for the employers shortcomings. Fourthly, they should uplift the workers ability to deal with e-commerce. Fifthly, they should get the workers equipped with a variety of knowledge. Sixthly, they should improve and make a full use of potential capacity of women workers. Seventhly, they should encourage the workers to learn foreign languages by which they will acquire an international way of thinking. Among foreign languages, English, Japanese and Chinese languages are strongly recommended.

고환종양 발생과 관련하여 소아 고환미석증의 임상적 의의

송기현,박진성,김건석 대한비뇨의학회 2009 Investigative and Clinical Urology Vol.50 No.1

Purpose: The object of our study was to examine the clinical significance of pediatric testicular microlithiasis(TM) as it relates to testicular cancer. Materials and Methods: Seven boys in whom TM was incidentally detected were followed for a mean of 51±44 months(range: 9-119 months) for testicular cancer surveillance. The average patient age at the initial diagnosis was 9.8±2.5 years. The frequency of coincidental TM detected on scrotal ultrasonography performed for all clinical purposes at our institution between January 1997 and January 2008 was investigated. Eighty-two testicular cancer patients and 1,006 noncancer patients underwent ultrasonography between 1997 and 2006, and these patients were divided into two age groups(children, age <15 years; adults, age ≥15 years) for purposes of analysis. Results: Of the seven patients followed solely for TM, none developed testicular cancer during the surveillance period. Coincidental TM seen on scrotal ultrasonography was significantly higher in the testicular cancer patients than in the noncancer controls(11%(9/82) vs. 3.5%(36/1,006), p<0.0001). According to the age groups, TM was found in 6% and 5.8% of the testicular cancer patients and the noncancer controls, respectively, in the children’s group, whereas in the adult group, 11.6% and 3.3% of the patients in the respective groups were found to have TM. Conclusions: The incidence of testicular cancer development in children with incidentally detected TM was very low, and the incidence of coincidental TM in children with testicular cancer did not differ from that in the noncancer control patients. However, the significantly higher incidence of TM accompanying testicular cancer after puberty may suggest an association of the two pathologies, which would then mandate cancer surveillance in cases of incidentally detected TM in this age group. Purpose: The object of our study was to examine the clinical significance of pediatric testicular microlithiasis(TM) as it relates to testicular cancer. Materials and Methods: Seven boys in whom TM was incidentally detected were followed for a mean of 51±44 months(range: 9-119 months) for testicular cancer surveillance. The average patient age at the initial diagnosis was 9.8±2.5 years. The frequency of coincidental TM detected on scrotal ultrasonography performed for all clinical purposes at our institution between January 1997 and January 2008 was investigated. Eighty-two testicular cancer patients and 1,006 noncancer patients underwent ultrasonography between 1997 and 2006, and these patients were divided into two age groups(children, age <15 years; adults, age ≥15 years) for purposes of analysis. Results: Of the seven patients followed solely for TM, none developed testicular cancer during the surveillance period. Coincidental TM seen on scrotal ultrasonography was significantly higher in the testicular cancer patients than in the noncancer controls(11%(9/82) vs. 3.5%(36/1,006), p<0.0001). According to the age groups, TM was found in 6% and 5.8% of the testicular cancer patients and the noncancer controls, respectively, in the children’s group, whereas in the adult group, 11.6% and 3.3% of the patients in the respective groups were found to have TM. Conclusions: The incidence of testicular cancer development in children with incidentally detected TM was very low, and the incidence of coincidental TM in children with testicular cancer did not differ from that in the noncancer control patients. However, the significantly higher incidence of TM accompanying testicular cancer after puberty may suggest an association of the two pathologies, which would then mandate cancer surveillance in cases of incidentally detected TM in this age group.

Electroluminescence Properties of Highly Efficient Dual Core Chromophores for OLED Blue Emission

송기현,이하윤,김범진,박종욱 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

Two new blue emitting compounds of L,L-DC and L,N-DC for OLED based on dual-core were demonstrated. Physical properties by the change of the dual-core linkage of lobe-to-lobe or lobe-to-node synthesized materials were examined. L,L-DC was found to exhibit the highest EL device efficiency of 5.34 cd A-1 and 5.30 % EQE. OLED devices were fabricated by the synthesized compounds using vacuum deposit process as an emitting layer. Device structure was ITO/2-TNATA 60nm/ NPB 15nm/ EML 35nm/ Alq3 20nm/ LiF 1nm/ Al 200nm. L,L-DC and L,N-DC exhibit EL maximum values of blue color in the range 455 nm to 463 nm. The y values of their color coordinates are 0.13, so these compounds exhibit good blue color coordinates for displays.

관광동기에 따른 관광행동이 지각된 가치에 미치는 영향

송기현,최현실 관광경영학회 2019 관광경영연구 Vol.87 No.-

This study intends to examine tourist behavior in a tourist site with the classification of a positive tourist behavior and a negative tourist behavior. The study develops a model that explains how tourist motivation influences tourist behavior, how perceived value is influenced by tourist behavior and how they influence to satisfaction. The participants were 387 adult tourists who had traveled over the last two years from the current year 2017. The study used SPSS 22.0 for Window statistical package for empirical analysis. To accomplish the research goal, 22 hypotheses were developed. 18 hypotheses out of 22 hypotheses were accepted. The hypotheses testing outcomes are summarized as follows. First, as to the hypotheses “tourist motivation significantly influences to tourist behavior”, Tourist site visiting motivation was not influential to negative tourism motivation, tourist site attraction negatively influenced on a negative tourist behavior. That is, the higher tourist site attraction was the lesser the negative tourist behavior was. Thus, it is recommended to create unique and entertaining contents in a tourist site. Second, as to the result of “tourist behavior is influential to perceived value” showed that a positive tourist behavior was influential to perceived value. A negative tourist behavior was not influential to emotional value, and it negatively influenced social value and positively on functional value. That is, when negative tourist behavior was conducted people tend not to feel happy nor perceived that they had a good memory after the tour. The more negative tourist behavior the lower social value was. That is, tourists might recognize that a negative tourist behavior was not matched to one's identity or self-image. The limitation of this study lies in response reliability, because the personal inquiry asks about a negative tourist behavior that may cause respondents hesitant to reply. A future study may provide models with higher explanatory power with more influential variables if it overcomes such limitation.

한글 자연언어의 기계이해에 관한 연구

송기현,김민홍 경기대학교기초과학연구소 1990 기초과학논문집 Vol.4 No.-

호텔 브랜드 이미지가 자아일치성, 브랜드 태도에 미치는 영향

송기현,김민경 관광경영학회 2018 관광경영연구 Vol.84 No.-

The propose of this study is to investigate the empirical study of how the self-image congruity for hotel brand image influences on the consume attitude. The data was collected from 221 tourists who uses five-star hotels in Seoul. and the collected data was analyzed using SPSS 22.0. The finding and implications of this study were as follows. Firstly, among Brand Image factors, Firstly, among the symol of hotel brand dose not have a significant impact on Brand Self-congruity. Second, other brand image factors(attraction, uniqueness, value) have positive effect on Brand Self-congruity. Finally, all determinations of Brand Self-congruity were found to be positive and statistically significant in the formation brand attitude. In future study, it will have more scientific meaning with expanding valid sample to conduct the research by classifying regard regional level or hotel ratings level of subject hotels.