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GPS를 이용한 안드로이드 폰 자동 설정 어플리케이션 (U need Utility)
배현직;박정길;윤상문;이기주;김흥식 인제대학교 2012 仁濟論叢 Vol.27 No.1
Since the Apple's iPhone was released in Korea, many users use any smartphone. Since smartphones launch in Korea, many users change the previous feature phone to smartphone, and its users continue to increase. One of the advantages of smart phones is that user can install a wanted application like the computer, so the demand of applications has been increasing gradually. We are intended to study the development of smartphone application with location information by GPS. Instead of making the result of current location information by informing current position to users or approved third parties by them, we process their information which needs to be used internally them. And we study the application which changes the status of smartphone automatically by position information.
제올라이트의 양이온 교환 용량 및 용액의 화학적 특성에 따른 박테리아의 거동 특성 비교
김문주 ( Mun-ju Kim ),이창희 ( Chang-hee Lee ),유수철 ( Soo-cheul Yoo ),박성직 ( Seong-jik Park ) 한국수처리학회 2017 한국수처리학회지 Vol.25 No.5
Bacteria attachment on zeolite with different cation exchange capacity (CEC) was investigated, and zeolite with low CEC (LC-ZL), zeolite with medium CEC (MC-ZL), and zeolite with high CEC (HC-ZL) were used. Column experiments were performed varying column length (10-15 cm), pH (4-8), and ionic strength (0-80 mM). As the increase of the column length, removal percentage was increased but sticking efficiency was not dependent on the column length. The increase of pH decreased both removal percentage and sticking efficiency. Bacteria attachment onto zeolite was increased as the increase of the ionic strength from 0 to 20 mM but it was decreased above 20 mM of the ionic strength. At long (20 cm) or short (10 cm) column length, the differences of removal percentage of LC-ZL, MC-ZL, and HC-ZL were not observed. The bacteria attachment onto MC-ZL and HC-ZL was not significantly different at high ionic strength. Solution chemistry should be considered when the selection of appropriate zeolite for the removal of bacteria.
Kim, Bong Jik,Han, Jae Joon,Shin, Seung Han,Kim, Han-Suk,Yang, Hye Ran,Choi, Eun Hwa,Chang, Mun Young,Lee, Sang-Yeon,Suh, Myung-Whan,Koo, Ja-Won,Lee, Jun Ho,Choi, Byung Yoon,Oh, Seung-Ha Hindawi 2018 BioMed research international Vol.2018 No.-
<P>Congenital cytomegalovirus (cCMV) infection is a common congenital infection that causes sensorineural hearing loss (SNHL). Despite its substantial impact on public health and cost burden, epidemiology and clinical features of CMV-related SNHL have never been reported in the Korean populations. This study investigated the detailed audiologic phenotypes of cCMV infection to see if a specific SNHL pattern is associated with a particular clinical setting. A total of 38 patients with cCMV infection were studied retrospectively. Patients were classified into three groups with distinct demographics: clinically driven diagnosis (n=17), routine newborn CMV screening according to the NICU protocols (n=10), or referral to ENT for cochlear implant (CI) (n=11). The incidence of cCMV infection was 3.6%, showing 33.3% of SNHL among cCMV patients, 38% of asymmetric hearing loss, 29% of late-onset hearing loss, and diverse severity spectrum in patients with CMV-related SNHL. CI recipients with CMV-related SNHL showed a significantly improved speech perception. Surprisingly, in 36.4 % of CI implantees, initial audiological manifestation was significant asymmetry of hearing thresholds between both ears, with better ear retaining significant residual hearing up to 50dB. CMV turns out to be a significant etiology of SNHL, first to date reported in the Korean pediatric population. Analysis of audiologic phenotypes showed a very wide spectrum of SNHL and favorable CI outcomes in case of profound deafness. Especially for the patients with asymmetric hearing loss, close surveillance of hearing should be warranted and CI could be considered on the worse side first, based on the observation of rapid progression to profound deafness of better side.</P>
이형직,조상현,최흥문,Lee, Hyeong-Jik,Jo, Sang-Hyeon,Choe, Heung-Mun 대한전자공학회 2000 電子工學會論文誌-SC (System and control) Vol.37 No.5
본 논문에서는 심장 MRI 영상에서 혈류 윤곽선을 자동으로 추출하는 방법을 제안하였다. 제안한 방법에서는 기존 snake 보다 포획 범위가 넓은 GVF(gradient vector flow) snake를 사용하고, 심장 MRI의 에지 영상에서 GVF 계(field)가 영인 영역의 외곽을 따라 초기점들을 자동 발생시킴으로써, 전문가의 수작업 초기화에 의존하던 기존 방법과는 달리, 유두근으로 인한 요면을 갖는 혈류 윤곽선까지도 자동으로 추출할 수 있도록 하였다. 유두근 돌출로 인한 요면을 가지거나 잡영이 섞여있는 실제 심장 MRI들에 대해 실험하여 혈류 윤곽선을 효과적으로 자동 추출할 수 있음을 확인하였다. In this paper, an automatic extraction of the blood flow contour from cardiac MRI is proposed. By using the GVF snake which has wider capture range than the conventional snake, and by automatically generating the initial points along the outside of the contour of the zero GVF field in the edge image of the cardiac MRI, the blood flow contour can be automatically extracted, even when the contours have boundary concavities due to the papillary muscles, without any manual initialization of the experts. Experiments are conducted on the various real cardiac MRIs including noise and papillary muscles, and the proposed method is proved to be efficient in automatic extraction of the blood contours even if they have the boundary concavities.
URI-T, 해저 케이블 매설용 ROV 트렌처 개발 및 실해역 성능 검증
강형주(Hyungjoo Kang),이문직(Mun-Jik Lee),조건래(Gun Rae Cho),기건희(Geonhui Ki),김민규(Min-Gyu Kim),이계홍(Ji-Hong Li) 한국해양공학회 2019 韓國海洋工學會誌 Vol.33 No.3
An ROV trencher is a type of heavy-duty work class ROV equipped with high-pressure water jet tools for cutting into the sea floor and burying cables. This kind of trencher is mostly used for PLIB operations. This paper introduces the development of this kind of ROV trencher, which has a 698 kW power system, with a 250 kW hydraulic system and two 224 kW water jet systems. The project was launched in January 2014. After four years of design, manufacturing, and system integration, we carried out two sea trials near the Yeongilman port (about 20–30 m in depth) in Pohang to evaluate the system performance in November 2017 and August 2018. Through tests, we found that most of specifications were satisfied, including a maximum bury depth of 3 m, maximum bury speed of 2 km/h, and maximum forward speed of 1.54 m/s.
Min-Gyu Kim,Hyungjoo Kang,Mun-Jik Lee,Gun Rae Cho,Ji-Hong Li,Tae-Sam Yoon,Jaeheung Ju,Han-Wan Kwak 한국해양공학회 2020 韓國海洋工學會誌 Vol.34 No.5
We developed a heavy-duty work class ROV trencher named URI-T (Underwater robot it’s trencher) that can conduct burial and maintenance tasks for underwater cables and small diameter pipelines. It requires various supporting systems, including a dynamic positioning (DP) vessel, launch and recovery system (LARS), A-frame, and winch in order to perform burial tasks because of its dimensions (6.5 m × 5.0 m × 4.5 m, 20 t) and the tough working environment. However, operating a DP vessel has disadvantages as it is expensive to rent and operate and it is difficult to adjust the working schedule for some domestic coast construction cases. In this paper, we propose a method using a barge instead of a DP vessel to avoid the above disadvantages. Although burying the cable and pipeline using a barge has lower working efficiency than a DP vessel, it can save construction expenses and does not require a large crew. The proposed method was applied over two months at the construction of the water supply in Yokji-do, and the results were verified.
P-SURO II 하이브리드 자율무인잠수정 기술 개발 및 현장 검증
이계홍(Ji-Hong Li),이문직(Mun-Jik Lee),박상현(Sang-Heon Park),김정태(Jung-Tae Kim),김종걸(Jong-Geol Kim),서진호(Jin-Ho Suh) 제어로봇시스템학회 2013 제어·로봇·시스템학회 논문지 Vol.19 No.9
In this paper, we present the development of P-SURO II hybrid AUV (Autonomous Underwater Vehicle) which can be operated in both of AUV and ROV (Remotely Operated Vehicle) modes. In its AUV mode, the vehicle is supposed to carry out some of underwater missions which are difficult to be achieved in ROV mode due to the tether cable. To accomplish its missions such as inspection and maintenance of complex underwater structures in AUV mode, the vehicle is required to have high level of autonomy including environmental recognition, obstacle avoidance, autonomous navigation, and so on. In addition to its systematic development issues, some of algorithmic issues are also discussed in this paper. Various experimental studies are also presented to demonstrate these developed autonomy algorithms.
3D Path Tracking of Underactuated AUVs with General Form of Dynamics
Ji-Hong Li,Jung-Tae Kim,Mun-Jik Lee,Hyung-Ju Kang,Min-Jae Kim 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
This paper proposes a 3D path tracking method for a class of torpedo-type AUVs (autonomous underwater vehicles) with general form of dynamics. For this kind of AUV, there are only three control inputs are available for its 6DOF 3D motion, and therefore it’s a typical underactuated system. First, we introduce certain two spherical coordinate transformations so as to transform the vehicle model into three-inputs-three-outputs second-order strict-feedback form. To avoid possible singularity problem in the recursive control design, an asymptotic modification of orientation concept is introduced. Proposed tracking scheme can guarantee the asymptotic stability of closed-loop system in the spherical coordinate frames.