• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.22 no.6
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• pp.83-89
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• 2022

Internet of Things technology is rapidly developing due to the recent development of information and communication technology. IoT technology utilizes various sensors to generate unique data from each sensor, enabling diagnosis of system status. However, the equipment management system currently in effect is a post-preservation concept in which administrators must deal with the problem after the problem occurs, which could mean system reliability and availability problems due to system errors, and could result in economic losses due to negative productivity disruptions. Therefore, this study confirmed that edge controller control decision algorithms for more efficient operation of rectifiers in the factory by applying intelligent IoT (AIoT) technology and domain knowledge-based modeling for each sensor data collected based on this, outputting appropriate status messages for each scenario.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.329-331
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• 2013

본 어플은 사회적 문제를 기술적 패러다임에 맞춰 해결하고자 기획되었다. 일반적으로 자기 자신의 문제점보다 다른 사람의 문제점이 더 쉽게 보이고 인식하게 된다. 작은 문제로 볼 수 있지만 최근 사회적 문제로 발생하고 있는 "따돌림" 문제는 인간의 존엄성마저 잃어버리게 하고 있다. 친구들의 문제뿐 아니라 부모와 자식, 형제, 자매 등 가족들과의 의사 단절 등으로 확대되고 있으며, 이런 문제를 해결하기위하여 많은 노력들을 하고 있지만, 실제 치료의 시간도 오래 걸리고 많은 금전도 필요하게 된다. 이렇기에 최근 트랜드의 축이 되고 있는 "스마트폰"을 활용하여 시간적, 공간적 제약을 최소화하고 더불어 수익성을 고려하여 "WHO"의 어플을 기획하게 되었다. 특히, 사후문제 처리가 아닌 "예방"의 목적으로 상대방의 문제점을 파악하는 것과 자신의 문제점을 인지하고 해결하는데 중점을 두었다. 내가 아닌 지인이 나에 대한 평가를 보다 객관적인 평가를 하기 위하여 대상자를 자신의 스마트폰 주소록에 한정하였으며, 악위적인 댓글 등을 최소화하기 위하여 금지어, 입력글자 개수제한 등을 추가하였다. 평점을 줄 수 있게 하여 상대적이고 객관적인 점수로 자신의 평점을 알 수 있게 하였고 보다 빠른 인지를 위하여 별모양의 그래픽을 사용하여 평가하도록 하였다. 특히, 본 어플은 설치자만이 사용할 수 있기 때문에 주소록에 있는 명단에서 "초대하기"기능으로 설치를 유도하였다. 본 어플을 개발 후 2주간의 테스트를 통하여 어플의 기대효과에 대한 가능성에 대해 확인할 수 있었으며 추가로 개발될 어플에는 분야별 항목을 추가하여 보다 섬세한 자아평가를 가능하도록 기획하고 있다.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.42 no.4 s.304
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• pp.39-48
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• 2005

This paper proposes novel texture segmentation method using Bayesian estimation method and neural networks. We use multi-scale wavelet coefficients and the context information of neighboring wavelets coefficients as the input of networks. The output of neural networks is modeled as a posterior probability. The context information is obtained by HMT(Hidden Markov Tree) model. This proposed segmentation method shows better performance than ML(Maximum Likelihood) segmentation using HMT model. And post-processed texture segmentation results as using multi-scale Bayesian image segmentation technique called HMTseg in each segmentation by HMT and the proposed method also show that the proposed method is superior to the method using HMT.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.901-904
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• 2010

Web 2.0의 등장과 함께 Web 2.0의 핵심요소인 OpenAPI의 사용이 늘어나고 있다. 또한 이들은 다른 서비스와 결합되어 새로운 복합 서비스를 만들어 내기도 하는데, 이를 매쉬업 서비스 (mash-up service)라 한다. 현재 많은 OpenAPI 중 가장 많이 이용되고 있는 지도 API는 매쉬업 서비스의 대표적인 자원이며 이와 함께 최근 대중화 되고 있는 스마트폰의 GPS를 이용하여 현대사회에서 문제가 되고 있는 아동 범죄, 노약자 보호 등의 문제를 해결하는데 이용될 수 있다. 본 연구에서는 OpenAPI와 매쉬업 기술을 기반으로 아동 및 노약자의 이동 경로를 관리하기 위한 서비스를 개발하였다. 이 서비스는 스마트폰의 GPS로부터 실시간 위치 좌표 값을 받아 지도 API를 이용하여 현재 위치를 표시해 주는 기능을 가진다. 또한 관리대상 (아동 및 노약자)의 이동경로를 미리 예측하고 이를 안전지역으로 설정해 놓음으로써 이들의 안전지역 이탈을 즉각적으로 알려줄 수 있도록 하여 이탈 시 해당 위치와 이탈 후의 이동경로를 확인할 수 있게 한다. 뿐만 아니라 과거의 이동경로와 안전지역 이탈 이력을 조회 해 볼 수 있음으로써 정확한 사고 발생 시각 및 지점을 확인할 수 있도록 한다. 본 논문에서 개발한 이동경로관리 서비스를 이용함으로써 아동 범죄 및 노약자 사고를 사전에 예방하도록 도와주고 사후에는 신속한 처리를 할 수 있도록 해 줄 것이다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.33 no.3
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• pp.537-547
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• 2023

As Internet of Things (IoT) technology evolves, IoT devices are being utilized in a variety of fields. However, it has become a new surface of cyber attacks and is affecting industries that did not previously consider cyber breaches. After a intrusion occurs, post-processing and damage spread prevention are important, but it is difficult to respond due to the lackof standards and guidelines. Therefore, in order to respond to such incidents, this paper establishes an incident data collection procedure and presents the data that can be collected to improve the intrusion data acquisition method for general IoT devices. In addition, we proved the efficiency and feasibility of the data collection procedure through experiments.

• Korean Journal of Hospice Care
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• v.8 no.1
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• pp.1-12
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• 2008

Perpose: The purpose of this study was to investigate the perception of death between Korean and Chinese nursing students. And it will help develop curriculum for preparing death, the quality of hospice care, as well as nursing education and practice. Methods: Data was collected from 492 nursing students participated(248 Korean and 244 Chinese) by questionnaire designed for examining Death Orientation (Thorson & Powell, 1988). They were analyzed using Cronbach's Alpha coefficients, factor analysis, t-test, ANOVA and regression analysis (SPSS; win 12.0 version) Results: More than half of the Korean nursing students followed a religion (58.5%) while the majority of Chinese nursing students did not follow a religion (93.9%). In the view of the afterlife, nursing students in China had two views. 'I really don't know what happens after a person dies (30.3%)' and ‘There is no afterlife and death is the end (29.5%)’. On the other hand the Korean nursing students’ answer were, 'After dying, a person goes to heaven or hell (27.3%)' and 'I really don't know what happens after a person dies. (22.9%)' The study also found that the average of 25 items in Death Orientation is 2.36points of nursing students in Korea and 2.50points of nursing students in China. This means that the concern, anxiety and fear were of the middle level for the Chinese Students and were higher than Korean students (t=3.51, p=.000). In the low factor of death orientation, those in Korea had higher 'anxiety of burden to family' than those in China (t=-3.50, p=.001). The nursing students in China had higher 'anxiety of the unknown (t=4.96, p=.000)', 'fear of suffering (t=6.88, p=.000), 'fear of extinction body and life (t=5.20, p=.000), 'fear of lost self-control(t=2.12, p=.034)', and 'anxiety of future existence and nonexistence (t=2.33, p=.020)' than those in Korea. There was no statistically significant difference for the 'concern of body and fear of identity lost' category. The death orientation of Korean nursing students had statistically significant differences according to age (t=3.20, p=.002), religion (t=2.56, p=.011), and afterlife (F=4.64, p=.000). The contribution of Death Orientation had a statistically significant difference, the afterlife variable (0.735, p=0.001). The death orientation of Chinese nursing students did not have any statistically significant differences. Conclusion: In conclusion, there were differences in death orientation between Korean and Chinese nursing students. In particular, those who believed in afterlife showed acceptance of death. The results of this study suggest that nursing curricula should include education program on death and spiritual nursing. Additional studies are needed to establish death education in China with careful considerations on Chinese policies, cultures and social systems.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.4
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• pp.93-99
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• 2019

The purpose of this study was to investigate the bond strength between PEKK(Polyetherketoneketone) and Sinfony(3M ESPE, Seefeld, Germany) the dental composite resin by proposing the three representative surface treatment methods and evaluate to see if they affect the bond strength between two materials. A total of 30 PEKK($Pekkton^{(R)}$ Ivory, $Cendres+M{\acute{e}}taux$, Bienne, Switzerland) specimens were prepared, embedded in acrylic resin, polished(P 1200 grid) to surface, and each group was divided into 10 specimens. After then, by the surface treatment method, it classified into three groups(n=10) such as Air abrasion group(PN), applying Single Bond Universal(3M ESPE) after Air abrasion(PB), applying OPAQUE(3M ESPE) after Air abrasion(PO). Then, veneering was performed by using Sinfony(3M ESPE, Seefeld, Germany). All completed specimens were allowed to rest in a $37^{\circ}C$ water bath for 24 hours. Shear bond strength of each group was measured and fracture patterns were classified. Statistic analysis was performed with One-way ANOVA followed by post hoc Scheffe tast (p<.05). Statistical analysis was performed using the SPSSWIN 21.0 program. As a result of one-way ANOVA, the average value of PB group was $27.67{\pm}4,18MPa$ and it was shown as the highest bond strength, PN and PO were $20.43{\pm}1.70$ and $19.8{\pm}4.77MPa$ each, and these were relatively low(F=18.4, P<.001), and as the post-test the Scheffe test was conducted and verified (p<.05). After examining the scheffe test, it was showed significant differences as PB>PO, PB>PN(p<.001). Through this study, in order to enhance the bonding force between PEKK and the composite resin, perform the Air abrasion and surface treatment by using Single Bond Universal(3M ESPE) is recommended, and as coMPared with other studies. And it is assumed that the increase of the application time of the Air abrasion affects the increase of the shear bond strength. Thus, further research is required.

• Journal of Korean Society of Transportation
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• v.27 no.3
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• pp.161-168
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• 2009

The ubiquitous transportation system environments make it possible to collect each vehicle's position and velocity data and to perform more sophisticated traffic flow management at individual vehicle or platoon level through V2V and V2I communication. It is necessary to develop a new traffic management paradigm to take advantage of the ubiquitous transportation system environments. This paper proposed a preventive congestion management algorithm for uninterrupted flow, whose goal is to minimize the incident potential and maximize the productivity by maintaining traffic flow stability. The algorithm includes the following steps: Processing the raw data to produce the 3-dimension speed/flow/density profile and to produce the platoon profile and the shock wave profile, Determining the traffic state and the flow stability based on the processed data, Deciding the desirable speed the according the traffic flow state, and finally Providing the desirable speed information. It remains as further work to perform field experiments and calibrate the algorithm parameters.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.7
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• pp.4357-4363
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• 2015

This study is to compare the differences of bonding strength based on the Degassing temperatures and various opaque materials for Ni-Cr alloy specimen which does not contain beryllium(Be). Numerous comparison tests have been performed to measure the bonding strength by experimenting 3-point flexural rigidity tests in order to find out ways of stabilization and enhancement of bonding strength between metal and porcelain. AVOVA, surface component observation experiment by SAM/EDS, and Tukey's HSAD posteriori tests results are as follows: First, The bonding strength in all groups has exceeded the minimum (25MPa) of ISO9693 bonding strength regulation for dental mental-porcelain specimen. Second, The bonding strength of Group V1 was $32.37{\pm}1.91MPa$, $38.25{\pm}1.38MPa$ in Group V2, $46.43{\pm}2.14MPa$ in Group V3 and $47.21{\pm}1.72MPa$ Group V4. The difference has been statistically meaningful. Tukey's HSAD posteriori tests results have shown that the bonding strength in Group V4 was higher than that of Group V1. Third, the bonding strength between metal and porcelain without degassing process was higher than that of with degassing process, and the bonding strength of powder opaque was higher than that of paste opaque. Fourth, Group V4 has ranked the highest on the comparison table of metal and porcelain bonding strength.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.11
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• pp.6527-6535
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• 2014

This research aims is to confirm the effects of cultural competence of an action learning based teaching method in multicultural nursing education. Cultural competence was composed of cultural knowledge, cultural awareness and cultural acceptance. A total of 118 college students were enrolled in this study. Both before and after learning, the students were guided to fill out a questionnaire regarding culture competence. The students from each group studied multicultural nursing by different teaching types: the Traditional Lecture-based Teaching method (TLT) and Action Learning based Teaching method (ALT). Data analysis was carried out by SPSS 21.0. A pre-post comparison within the group was performed using a paired t-test and the comparison between groups was performed using ANCOVA. The results showed that there was a significant difference in the culture competence in both teaching methods. In addition, ALT showed higher cultural acceptance results than TLT; however, there was no difference in cultural knowledge and cultural awareness between the two groups Therefore, ALT should be considered as a teaching method to enhance cultural competence in multicultural nursing education for Nursing students. Further studies on instructional design according to the task types, nursing performance, and the validity of ALT will be needed.