도시민의 도시농업 경험이 농촌체험관광에 미치는 영향

이인환,이효정,이슬비,전인철,김용근,Lee, In-Hwan,Lee, Hyo-Jeong,Lee, Seul-Bi,Jeon, In-Cheol,Kim, Yong-Geun 한국조경학회 2012 韓國造景學會誌 Vol.40 No.6

The purpose of this study were to classify the Y/N in participating the urban farming and to analyze the intention in farm village experience tourism, reason to participate and non-participation, the positive image and negative image between the urbanite group experience in urban farming and the other group that does not experience it. Questionnaire was implemented to the metropolitan urbanite who visited exemplary field farmhouse and urban recreation space to analyze the comparison of groups that experience or do not experience urban farming. The result of this research is as follows: first, experiencing urban farming are relatively less in willingness to participate in the farm village tourism experience than those who do not experience it. Second, the largest reason to participate in farm village tourism experience is found to be the natural environment of farm village tourism experience that is different from that of the city and the effect on children's education. Third, most answers on the reason for not participating in farm village tourism experience is because of the busy daily life. Fourth, urbanite have positive image in general about farm village tourism experience. Especially, when the comparison between the groups was made, it was showed that the difference in understanding the crops growing and the natural environment difference in the city. Fifth, about the negative image on the farm village tourism experience, it showed the difference in understanding the unfamiliar scenery, shortage of eye catching and fun, and the necessity and cost between the groups. Consequently, this study may be significant in the recognition of the farm village tourism experience on urbanite were checked, it was revealed that Y/N experience in the urban farming made negative influence to the willing.

영남지역 지하수에서 대장균군의 분포 및 분리한 세균의 특성

이인환,김수경,최윤희,김종설,Lee In-Hwan,Kim Soo-Kyung,Choi Yun-Hee,Kim Jong-Seol 한국미생물학회 2006 미생물학회지 Vol.42 No.2

To evaluate bacteriological water quality of groundwater in Yeungnam Province, samples were taken from 123 locations during summer and 117 locations during winter. The medians of heterotrophic plate counts.(HPCs) were 30 CFU/mL for the summer samples and 40 CFU/ml for the winter, and more than 25% showed HPCs higher than 100 CFU/ml. Coliform bacteria were detected from 46% of the summer samples and 30% of the winter. In these coliform-positive samples, the medians of coliform counts were 20 CFU/ml for the summer samples and 4 CFU/ml for the winter. Genera such as Citrobacter, Enterobacter, Escherichia, Klebsielia, Pantoea, Rahnellia, and Serratia were identified from the coliform isolates; among them, 48% were members of the genus Enterobacter. While E. cloacae, E. amnigenus, and K. pneumoniae were the most frequently isolated species, E. coli was isolated only from 1 location. The coliform counts were positively correlated with the HPCs, which also positively correlated with water temperature. The results of present study provide further insight on the extent of groundwater contamination with coliform bacteria.

기계적 자극을 고려한 bioreactor 개발

박정훈(Jeong Hun Park),이인환(In Hwan Lee),이승재(Seung-Jae Lee),조동우(Dong-Woo Cho) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5

Articular cartilage has a limited capacity to repair damage resulting from injury or disease because of its avascular nature. In this regard, it has been studied that regeneration of cartilage at in-vitro environment in tissue engineering. And it is reported that mechanical stimuli take a role in improving cell growth in articular cartilage. In this study, we designed a custom bioreactor capable of applying controlled compression to cell-seeded scaffolds. This device consisted of a circulation system and compression system. In circular system, culture chamber was sealed for prohibiting contamination and media solution was circulated by pump. In compression system, mechanical stimuli were controlled by LabVIEW software and mechanical transfer system. Control program was divided two modes such as continuous mode and discrete mode. Therefore, developed bioreactor can be produced two conditions of mechanical stimulation.

Economical Gas Chamber for In-situ Gas Measurement and Analysis of Gas Response Characteristics according to Sensor Voltage

Yun-Suk Choi(최연석),In Hwan Lee(이인환) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.5

Breath analysis using a portable device is better than the classical breath analysis system in terms of installation and operation. There is an increasing need to develop cost-effective equipment for testing gas sensors from the viewpoint of functionalities that can be applied applicable to portable devices. In the present study, an economical gas chamber for in-situ gas measurement is implemented with a single gas chamber without using expensive gas storage and control equipment; the gas response characteristics are analyzed using the above-described chamber. The main features of the implemented gas chamber are simple injection procedure, improved gas diffusion, easy measurement and cleaning, support for low-power mode measurement function for portable devices, and open source platform. Moreover, an analysis of gas response characteristics based on changes in sensor voltage show that the sensitivity and 90% response time are affected by the sensor voltage. Furthermore, the sensitivity graph has an inflection point in a specific range. The gas sensor applied in this study showed fast response speed and high sensitivity for sensor voltages of 3.0-3.5 V, regardless of the concentration of acetone gas, the target gas used in this study.

권두에세이

이인환,Lee, In-Hwan 대한결핵협회 2007 보건세계 Vol.54 No.5

공항상주직원의 감정노동에 대한 내부마케팅과 고객지향성에 대한 연구

이인환,김기웅,박성식,Lee, In-Hwan,Kim, Kee-Woong,Park, Sung-Sik 한국항공운항학회 2015 한국항공운항학회지 Vol.23 No.2

Airport is not only a public facility but a place where multiple cultural and ethnic groups are visiting. It has been reported though several researches that the level of emotional labor is more heavier than any other job. The more complex our society become, the more frequently emotional labor has been focused. Emotional labor became recently the issue of integrated studies above. Considering the level of emotional labor of airport employees, this paper believes their emotional labor has not been focused compared to such as tourism and service industry. This paper tried to research empirically the impact of internal marketing on airport employees' customer-oriented attitude based on their emotional labor using SEM (Structural Equation Modeling). According to the SEM results, it was proven that 'Autonomy of Airport Employee', a latent variable of internal marketing has a significant negative effect on employees' outside emotion. The outside emotion has also a significant effect on their customer-oriented attitude. It could be concluded the effort to increase decision making authority of employees should be implemented to provide them with deeper customer oriented insight.

LTE/WLAN 이종망 환경에서 퍼지제어와 정책적 다기준 의사결정법을 이용한 적응적 VHO 방안 연구

이인환,김태섭,조성호,Lee, In-Hwan,Kim, Tae-Sub,Cho, Sung-Ho 한국정보처리학회 2010 정보처리학회논문지 C : 정보통신,정보보안 Vol.17 No.3

차세대 이동통신 시스템에서는 3세대 진화망인 LTE(long-Term Evolution), WiMAX/WiBro, 차세대 WLAN등 다양한 무선 접속 기술이 All-IP 기반의 핵심망을 중심으로 통합되는 형태로 발전하고 있다. 이러한 발전에 따라 중첩된 다양한 무선 이종망 환경에서 최적의 조건을 제공하는 망으로의 접속을 제공하는 수직적 핸드오버가 필요하다. 그러나 현재까지는 각각의 네트워크가 독자적 서비스 제공을 위해 독립적인 무선자원관리 기능을 제공하여 왔으므로, 이종망 환경에서의 다양한 네트워크를 끊김없이 서비스를 제공하기 위해서는 개별 네트워크의 무선자원들을 통합적으로 관리하여 최적의 서비스를 제공할 수 있어야 할 것이다. 최근 이러한 무선 이종망 환경에서의 문제점을 해결하기 위해 적응적이동성을 위한 범용링크계층(GLL)과 통합무선자원관리(CRRM) 방식의 개념이 도입되고 있다. 본 논문에서는 LTE와 WLAN 사이에서의 효율적인 수직적 핸드오버를 위한 범용링크계층을 기반으로 정책기반과 다기준 의사결정법(MCDM)을 혼합한 수직적 핸드오버 알고리즘을 제안하고, 퍼지 로직 제어기(FLC)를 이용하여 핸드오버 시점을 적응적으로 결정하는 방안을 제안한다. 시뮬레이션 연구 결과 본 논문에서 제안하는 수직적 핸드오버 기법은 수신신호의 세기를 기반으로하는 방법과 MCDM 만을 사용하는 방법에 비해 데이터 처리량, 핸드오버 성공확률, 서비스 사용비용 그리고 핸드오버 시도 횟수 측면에서 우수한 성능을 보였다. For the next generation mobile communication system, diverse wireless network techniques such as beyond 3G LTE, WiMAX/WiBro, and next generation WLAN etc. are proceeding to the form integrated into the All-IP core network. According to this development, Beyond 3G integrated into heterogeneous wireless access technologies must support the vertical handover and network to be used of several radio networks. However, unified management of each network is demanded since it is individually serviced. Therefore, in order to solve this problem this study is introducing the theory of Common Radio Resource Management (CRRM) based on Generic Link Layer (GLL). This study designs the structure and functions to support the vertical handover and propose the vertical handover algorithm of which policy-based and MCDM are composed between LTE and WLAN systems using GLL. Finally, simulation results are presented to show the improved performance over the data throughput, handover success rate, the system service cost and handover attempt number.

봉형 GFRP를 삽입접착한 낙엽송 집성재 접합부의 모멘트저항 성능 평가

이인환 ( In Hwan Lee ),송요진 ( Yo Jin Song ),정홍주 ( Hong Ju Jung ),홍순일 ( Soon Il Hong ) 한국목재공학회 2015 목재공학 Vol.43 No.1

In order to evaluate the bond performance of domestic larch glulam and the glass fiber reinforced plastic (GFRP) rod, the specimen with the GFRP rod bonded-in domestic larch glulam for pull-out test was produced. The test was carried out using various specimens with different gluing depth, width of glue-line and type of adhesive. The cantilever type rahmen structure specimen with bonded-in GFRP rods was produced based on the result of pull-out test, and its moment resistance performance was compared and examined with the moment resistance performance of slotted-in steel plate specimen. As a result of the pull-out test, the most excellent bond performance was found when the insertion depth of GFRP rods was 5 times larger than the diameter of GFRP rods. When the glue-line thickness was 1 mm, the bond performance improved by 17%∼29% in comparison to the bond performance in the case of the glue-line thickness of 2 mm. Also, the bonded strength of the specimen used with poly-urethane adhesive was 2.9∼4.0 times greater than the bonded strength of specimen used with resorcinol adhesive. The cantilever type rahmen structure specimen with bonded-in GFRP rods showed the moment resistance performance 0.82 times lower in comparison to the slotted-in steel plate specimen used with the drift pin, but the initial stiffness was similar as 0.93 times.

바이오리액터를 이용한 MC3T3-E1 세포의 기계적 자극에 대한 영향

이인환(In Hwan Lee),박정훈(Jeong Hun Park),이승재(Seung-Jae Lee),조동우(Dong-Woo Cho),강상순(Sang Sun Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11

It is reported that mechanical stimulation takes a role in improving cell growth in skeletal system. And various research groups have showed that developed bioreactor to stimulate cell-seeded and threedimensional scaffold. In this study, we designed a custom-made bioreactor capable of applying controlled compression to cell-seeded agarose gel. This device consisted of a circulation system and compression system. In circular system, culture chamber was sealed for prohibiting contamination and media solution was circulated by pump. In compression system, mechanical stimuli were controlled by LabVIEW software and mechanical transfer system. Cell-encapsulated agarose gels were cultured for up to 7 days. There were significant differences between the number of cells grown in dynamic cell culture and in static cell culture from 3 days to 7 days.

IEEE802.16j 기반의 2-홉 셀룰러 중계시스템에서 하향링크 접근영역과 중계영역에 대한 최적 무선자원 할당방법 연구

이인환 ( In Hwan Lee ),김세진 ( Se-jin Kim ),조성호 ( Sung Ho Cho ) 한국인터넷정보학회 2010 인터넷정보학회논문지 Vol.11 No.3

In this paper, we evaluate the system throughput and the method of optimal wireless resource allocation for the access zone (AZ) and relay zone (RZ) in downlink when the cell coverage is extended using the non-transparent Relay Station (RS) in a 2-hop cellular relay system based on IEEE802.16j, which uses the OFDMA-TDD structure. For the analyses, we first introduce the MAC (Media Access Control) frame structure in the non-transparent mode, then we investigate the interfering elements in both AZ and RZ for the network devices such as the Mobile Station (MS) and RS. Through computer simulation, we analyze the cell coverage extension and system throughput in terms of the distance between Base Station (BS) and RS, then we present the amount of the optimal allocation of wireless resource for the AZ and RZ in downlink using our results.