DNA 3차원 구조 신비 밝혔다

김경규,Kim, Gyeong-Gyu 한국과학기술단체총연합회 2005 과학과 기술 Vol.38 No.12

인터넷 뱅킹 채택 행위에 있어서 신뢰와 위험의 영향

김경규(Kim Gyeong Gyu),이정우(Lee Jeong U),김혜선(Kim Hye Seon) 한국경영학회 2003 經營學硏究 Vol.32 No.6

Although the number of users of the Internet has been increasing significantly, the actual adoption rate of Internet banking seems to be relatively slower. This phenomenon can be explained by the risk perception in relation to the level of trust consumers may have against the Internet banking. This research is an attempt to examine the impact of trust and perceived risk on the trusting behavior(adoption) in the context of Internet banking. A conceptual model was developed based on previous literature on risk and trust. Variables in the model include relative advantage of Internet banking, size of the risk involved, probability of the risk involved, trust on Internet as a banking channel, and subdimensions of trust on bank - trust on promise keeping and opportunitistic misuse with the dependent variable of Internet banking adoption. Emprical test results suggests: (1) trust on Internet as a banking channal has a significant influence on perceived probability of risk as well as the adoption decision, (2)perceived size of the risk involved does not seem to influence the level of trust or the trusting behavior of adoption, and (3) the strength of a relationship among trust on the bank itself, relative advantage of Internet banking and adoption decision was found to be different depending on income level. Relatively high income group was concerned about opportunistic misuse while lower income group concerns about promise keeping. Further implications are discussed.

이달의 X-선 : 5년간 지속된 미만성 폐결절

김경규 ( Kim Gyeong Gyu ),김병규 ( Kim Byeong Gyu ),정기환 ( Jeong Gi Hwan ),정혜철 ( Jeong Hye Cheol ),김제형 ( Kim Je Hyeong ),박상면 ( Park Sang Myeon ),이신형 ( Lee Sin Hyeong ),신철 ( Sin Cheol ),조재연 ( Jo Jae Yeon ),심재 대한결핵 및 호흡기학회 2000 Tuberculosis and Respiratory Diseases Vol.48 No.5

드로잉 가공 성형폭약용기를 이용한 강재구조 발파공법에서 사용폭약의 종류가 절단성능에 미치는 영향

김경규 ( Gyeong-gyu Kim ),박훈 ( Hoon Park ),민경조 ( Gyeong-jo Min ),신찬휘 ( Chan-hwi Shin ),조상호 ( Sang-ho Cho ) 대한화약발파공학회 2021 화약발파 Vol.39 No.1

경제성장과 함께 급증한 산업구조물이 노후화됨에 따라 철 구조물 해체 수요가 증가하고 있으며, 선형 성형폭약의 관통 성능개선에 관한 연구가 관심을 받고 있다. 본 연구에서는 자체 제작한 성형폭약 장약 용기 내 사용하는 폭약의 종류와 기폭방식이 강재 절단 성능에 미치는 영향과 근접한 성형폭약에 미치는 영향에 대한 수치해석적인 분석을 수행하였다. 수치해석에는 폭발에 의한 재료의 대변형 해석이 가능한 ANSYS사 LS-DYNA를 사용하였으며 기체, 액체, 고체의 유동해석에 특화된 ALE(Arbitrary-Lagrange-Eulerian) 모델이 적용된다. As the national economic growth and the rapid increase in industrial structures are aging, the demand for removing steel structures is increasing, and research on improving the penetration performance of the linear shape charge explosives. In the study, numerical analyses were performed on the effect of the type of explosive used in the self-made shape charging container and the initiation method on the cutting performance of the steel plate and the effect on the shaped explosive installed close to it. ANSYS LS-DYNA, which can analyze the large deformation problem of materials due to explosion, was used, and an ALE(Arbitrary-Lagrange-Eulerian) model was applied that enables interlocking analysis of gases, liquids, and solid.

고위력 폭약의 화강암 내 장약공 폭발에 의한 지반진동 전파특성에 관한 연구

김경규 ( Gyeong-gyu Kim ),신찬휘 ( Chan-hwi Shin ),김한림 ( Han-lim Kim ),양주석 ( Ju-suk Yang ),배상호 ( Sang-ho Bae ),윤경재 ( Kyung-jae Yun ),조상호 ( Sang-ho Cho ) 대한화약발파공학회 2023 화약발파 Vol.41 No.4

암반발파는 광업, 터널공사, 지하 구조물 구축 등 다양한 분야에서 활용되고 있으며, 특히 지하공간의 활용이 증가하면서 암반발파 기술이 더 중요한 역할을 하고 있다. 암반발파 시 발파공에서 발생하는 발파공의 압력은 파쇄도, 발파진동 등에 직접적인 영향을 미치는 변수이며, 폭약의 성능 평가 및 발파 결과 예측에 있어서 가장 중요한 매개변수 중 하나이다. 이와 같은 발파공 압력은 몇몇 연구자들에 의해 연구가 수행된 바가 있지만, 폭약의 종류, 폭약량, 발파조건 등 실험조건으로 인하여 비교가 어려운 실정이다. 본 연구에서는 발파공 압력센서와 관측공 압력센서를 제작하여 단일공 발파 시 발파공과 관측공의 압력을 측정하였다. 실험결과를 바탕으로 발파공 주변 압력 전파특성과 발파진동 전파특성에 대해 고찰하였다. Rock blasting is utilized in various fields such as mining, tunneling, and the construction of underground structures. The role of rock blasting technology has became increasingly significant with the growing utilization of underground cavity. Blast hole pressure, generated during rock blasting, is a critical variable directly impacting factors such as crushing and blast vibration. It stands out as one of the most important parameters for assessing explosive performance and predicting blasting effects. While blast hole pressure has been studied by several researches, comparisons are challenging due to variations in experimental conditions such as explosive type, charge, and blasting conditions. In this study, blast hole pressure sensors and observation hole pressure sensors were developed to measure pressure during single-hole blasting, The experimental results were then used to discuss the propagation characteristics of pressure around the blast hole and the corresponding blast vibration.

고위력 폭약의 석회암 내 장약공 폭발에 의한 지반진동 전파특성에 관한 연구

김경규 ( Gyeong-gyu Kim ),신찬휘 ( Chan-hwi Shin ),김한림 ( Han-lim Kim ),양주석 ( Ju-suk Yang ),배상호 ( Sang-ho Bae ),윤경재 ( Kyung-jae Yun ),조상호 ( Sang-ho Cho ) 대한화약발파공학회 2023 화약발파 Vol.41 No.4

최근 연구시설 및 자원개발 등의 목적으로 지하공간 활용이 증가하고 있으며, 저심도 암반을 넘어 고심도 암반에 대한 개발이 증가하고 있다. 고심도 지하공간 개발은 높은 응력과 높은 온도 조건에서의 암반의 안정성을 고려해야 한다. 고심도의 경우 암반 구조와 불연속면의 상태 등이 안정성에 영향을 미칠 뿐만 아니라 지진 및 굴착을 위한 암반발파에 의한 지반진동 전파가 지하공동의 응력변화를 발생시켜 암반의 안정성에 영향을 미치게 된다. 발파공학 측면에서 지반진동을 예측하는 방법은 실측 데이터를 바탕으로 통계학적 회귀분석을 통한 경험적 회귀모형과 수치해석적 방법이 사용되고 있다. 본 연구에서는 단일공 발파에 의한 폭발압력 전파특성과 지반진동 전파특성에 대한 경험적 회귀모형을 획득하기 위하여 실험적 방법을 통해 연구를 수행하였다. Recently, the utilization of underground space for research facilities and resource development has been on the rise, expanding development from shallow to deep underground. The establishment of deep underground spaces necessitates a thorough examination of rock stability under conditions of elevated stress and temperature. In instances of greater depth, the stability is influenced not only by the geological structure and discontinuity of rock but also by the propagation of ground vibrations resulting from earthquakes and rock blasting during excavation, causing stress changes in the underground cavity and impacting rock stability. In terms of blasting engineering, empirical regression models and numerical analysis methods are used to predict ground vibration through statistical regression analysis based on measured data. In this study, single-hole blasting was conducted, and the pressure of the blast hole and observation hole and ground vibration were measured. Based on the experimental results, the blast pressure blasting vibration at a distance, and the response characteristics of the tunnel floor, side walls, and ceiling were analyzed.

자세 변화와 도구 사용 시 최대 들숨과 날숨 시 호흡근의 근활성도 차이

김근조(Keun-Jo Kim),장영(Zang Rong),조동혁(Dong-hyeok Jo),정주은(Ju-eun Jeong),김경규(Gyeong-gyu Kim),김문규(Mun-kyu Kim),김민지(Min-zy Kim),김현승(Hyun-seung Kim),박경현(Kyeong-hyeon Park),박새롬(Sae-rom Park),이영준(Yeong-jun Lee) 대한심장호흡물리치료학회 2021 대한심장호흡물리치료학회지 Vol.9 No.1

Purpose : In this study, we aimed to measure how respiratory muscle activity changes as posture changes. We also aimed to measure the inspiratory sternocleidomastoid (SCM) and upper trapezius (UT) muscle activities as well as expiratory rectus abdominis (RA) and oblique abdominis (OA) muscle activities in healthy male and female university students in their twenties. Methods : Using the percentage of reference voluntary contraction (% RVC) with electromyography, we measured the SCM, UT, RA, and OA muscle activities in 16 healthy male and female university students in their 20s according to position change and breather tool use. Results : We found that the average value of inspiratory and expiratory muscle activities by posture was highest when using the breather tool. When using the tool with 10-mm and 2-mm straws for standard breathing at rest in the sitting position, a statistically significant increase in SCM, UT, and OA activities occurred (p < 0.05). For standard breathing at rest in the supine position, a statistically significant increase in SCM, RA, and OA activities occurred (p < 0.05). Conclusion : In clinical application, it may be better to use a respiratory muscle-strengthening tool to increase the activity of inspiratory and expiratory muscles.

B2C 환경에서 고객신뢰와 e-Loyalty의 관계에 관한 연구 -인터넷 서적 시장을 중심으로-

김주영 ( Kim Ju Yeong ),김경규 ( Kim Gyeong Gyu ) 한국소비자학회 2004 소비자학연구 Vol.15 No.1

In today`s turbulent Internet business environment, high costs of acquiring new customers and relative difficulties in retaining them makeonline customer loyalty an essential asset. Prior research suggests that, because of the unique characteristics of the Internet as a transaction channel, consumer trust in web merchants have significant effects on Internetbusiness success. This study empirically examines whether consumer trustand consumer satisfaction in online bookstores are significant determinants of e-Loyalty. It also investigates whether institutional characteristics such as website image, structural assurances, service quality, and price fairness influence consumer trust and consumer satisfaction. The results confirm that consumer satisfaction positively influence e-Loyalty on online bookstores. Institutional characteristics are found to influence consumer satisfaction. Contrary to our expectations, consumer trust in Web merchants does not show any association with e-Loyalty. Possible explanations on these findings and future research implications arediscussed.

UAV 열적외선 영상을 이용한 지붕 재질별 온도 분석

이근상(Lee, Geun Sang),김경규(Kim, Gyeong Gyu),조상호(Cho, Sang Ho) 한국지적정보학회 2021 한국지적정보학회지 Vol.23 No.1

최근 기후변화에 따른 도시열섬 현상으로 인간의 건강과 생활이 크게 위협받고 있다. 본 연구에서는 도시 열섬저감 대책 수립에 필요한 자료를 제공하기 위해 UAV 기반 열적외선 영상을 이용하여 지붕 재질별 온도변화 특성을 분석하였다. 먼저 DJI Matrice 210 UAV에 Zenmuse XT 열적외선 카메라를 탑재하여 촬영을 실시하였으며, Flir Tools S/W를 이용하여 온도 특성을 분석하였다. 2020년 6월 22일 12시에 촬영한 UAV 열적외선 영상을 분석한 결과, 열 전도율이 높은 철재강판 지붕의 평균온도가 73.7 ℃ 로 다른 지붕 재질에 비해 가장 높게 나타났다. 또한 2020년 8월 5일에는 강우로 인해 지붕이 충분히 가열되지 않았으며, 이로 인해 모든 지붕 표면의 평균온도는 낮게 나타났다. 2020년 8월 19일은 15시는 오전부터 지속된 태양에너지로 인해 노출 콘크리트 내부에 축적된 열이 표면으로 방출되었으며, 이로 인해 노출 콘크리트의 평균온도가 74.1 ℃로 가장 높게 나타났다. 차열페인트 콘크리트 지붕은 콘크리트는 2020년 6월 22일 12시, 8월 5일 17시, 8월 19일 15시에 노출 콘크리트에 비해 각각 15.7, 18.9, 33.9 %의 쿨링 효과를 보였다. 시간대별로 지붕 재질에 대한 온도 특성을 분석함으로써 본 연구의 결과는 여름철 폭염피해 저감을 위한 의사결정자료로 활용될 수 있다. 특히 차열페인트의 쿨링 효과가 매우 높게 나타나 도시열섬 현상이 심각한 지자체를 중심으로 기존 노출 콘크리트를 차열페인트 지붕으로 교체하는 사업을 적극적으로 고려해야 할 것이다. Recently, human health and life are greatly threatened by the urban heat island phenomenon caused by climate change. In this study, the temperature change characteristics of each roof material were analyzed using UAV-based thermal infrared images to provide the data necessary for establishing urban heat island reduction measures. First, the DJI Matrice 210 UAV was photographed with a Zenmuse XT thermal infrared camera, and the temperature characteristics were analyzed using Flir Tools S/W. As a result of analyzing the UAV-based thermal infrared image taken at 12:00 on June 22, 2020, the average temperature of the steel sheet roof with high thermal conductivity was 73.7 , which was the highest compared to other ℃ roof materials. In addition, on August 5, 2020, the roof was not heated sufficiently due to rainfall, which resulted in a low average temperature on all roof surfaces. At 15:00 on August 19, 2020, the heat accumulated in the exposed concrete was released to the surface due to the solar energy sustained from the morning, and as a result, the average temperature of the exposed concrete was the highest at 74.1 ℃. Concrete roofs coated with cool paint showed cooling effects of 15.7, 18.9 and 33.9%, respectively, compared to exposed concrete at 12:00 on June 22, 17:00 on August 5, and 15:00 on August 19, 2020. By analyzing the temperature characteristics of the roof material by time, the results can be used as decision-making data to reduce heat damage in summer. In particular, the cooling effect of the cool paint was very high, and therefore, the project of changing the existing exposed concrete roof to the cool paint roof should be actively considered, centering on local governments with severe urban heat islands.

백서 천식에서 면역 증강성 CpG 올리고 뉴클레오티드 투여의 효과

이신형 ( Lee Sin Hyeong ),김제형 ( Kim Je Hyeong ),정혜철 ( Jeong Hye Cheol ),김경규 ( Kim Gyeong Gyu ),정기환 ( Jeong Gi Hwan ),김병규 ( Kim Byeong Gyu ),이승헌 ( Lee Seung Heon ),박상면 ( Park Sang Myeon ),신철 ( Sin Cheol ) 대한결핵 및 호흡기학회 2001 Tuberculosis and Respiratory Diseases Vol.50 No.1