The Experience with Diverting Ostomy for Crohn’s Pancolitis in Pediatric Patients

Hyunhee KWON,Yu Jeong CHO,Yong Jae KWON,Kyung Mo KIM,Seak Hee OH,Jung-Man NAMGOONG,Seong Chul KIM,Dae Yeon KIM 대한외과학회 2019 대한외과학회 학술대회 초록집 Vol.2019 No.10

Clinical Review of Duodenal Atresia: Twenty-Nine Years of Experience in a Single Center

Hyunhee KWON,Dae Yeon KIM,Yu Jeong CHO,Jung-Man NAMGOONG,Seong Chul KIM 대한외과학회 2018 대한외과학회 학술대회 초록집 Vol.2018 No.11

Redo pull-through for postoperative complications following pull-through in Hirschsprung disease: a single center experience

Yong Jae Kwon,Hyunhee Kwon,Jung-Man Namgoong,Seong Cheol Kim,Dae Yeon Kim 대한외과학회 2023 Annals of Surgical Treatment and Research(ASRT) Vol.105 No.1

Purpose: Although surgical management of Hirschsprung disease (HD) is effective in most patients, some patients experience long-term postoperative complications, and require redo pull-through (PT). The present study evaluated clinical outcomes of redo PT in HD patients at a single center. Methods: Patients with HD who underwent redo PT procedures between 2003 and 2019 were retrospectively reviewed. Results: Thirteen patients were included. Five (38.5%) had undergone initial PT surgery at our center and 8 (61.5%) at other centers. Redo PT procedures were transanal endorectal PT in 12 patients (92.3%) and the posterior sagittal approach in 1 patient (7.7%). Indications for redo PT included pathologic misdiagnosis in 8 patients (61.5%); stricture in 2 (15.4%); and rectal stenosis, obstructing Duhamel pouch and remnant septum in 1 each (7.7%). At a median follow-up of 68 months (range, 3–227 months) after redo PT, 8 patients (61.5%) had normal bowel function, 2 (15.4%) had incontinence, and 1 (7.7%) had constipation. Conclusion: Redo PT procedures could be an effective approach for improving obstructive symptoms in HD patients with anatomic or pathologic reasons following primary PT. Careful selection of patients and discreet indications for redo PT are crucial.

Quantitative computed tomographic evaluation of bone mineral density in beagle dogs: comparison with dual-energy x-ray absorptiometry as a gold standard

KWON, Danbee,KIM, Jaehwan,LEE, Hyeeun,KIM, Byeol,HAN, HyunHee,OH, HyunJu,KIM, MinJung,YOON, Hakyoung,LEE, ByeongChun,EOM, Kidong The Japanese Society of Veterinary Science 2018 The Journal of veterinary medical science Vol.80 No.4

<P>This study aimed to demonstrate the higher accuracy and reproducibility of quantitative computed tomography (QCT) compared with dual-energy X-ray absorptiometry (DXA) as a gold standard for measuring canine bone mineral density (BMD). Seven middle-aged beagle dogs underwent lumbar vertebral and bilateral femoral DXA and QCT scans. BMD (mg/cm<SUP>2</SUP>) was measured at the vertebral body from L2 to L6, femoral neck, and proximal and distal femoral diaphyses. The BMD values were measured 3 times and compared. The BMD value on QCT was higher than that on DXA for femoral BMD but not for vertebral BMD. The correlation was strong for the lumbar vertebrae (r=0.66) and was strongest for L3 (r=0.85). No correlation was found for the femoral neck (<I>P</I>=0.35), and only moderate correlations were found for the proximal and distal femoral diaphyses (r=0.43 and r=0.40, respectively). The limits of agreement were narrower for vertebral BMD than for femoral BMD, and L3 had the narrowest limits of agreement. The intraclass correlation (ICC) was higher for DXA than for QCT at all lumbar and femoral sites measured, but the ICC of QCT was higher than 0.7. In conclusion, L3 can be used to monitor changes in BMD, and relative values and sequential monitoring of femoral BMD can also be useful because of the high reproducibility of QCT measurements. QCT would be a useful technique for evaluation of BMD in veterinary practice.</P>

Recovery and Dynamic Flow Analysis of Mercury from Waste Fluorescent Lamps in Korea

( Hyunhee Kim ),( Yong-chul Jang ),( Jinhee Jeong ),( Yuree Kwon ),( Yeji Jang ),( Gain Lee ) 한국폐기물자원순환학회(구 한국폐기물학회) 2019 ISSE 초록집 Vol.2019 No.-

End-of-life fluorescent lamps containing with a toxic metal of mercury are collected from municipal waste streams. There are still huge amounts of the lamps in use from households, commercial areas, and industrial sectors, although demands for the lamps have been gradually decreasing with recent replacement with light emitting diode (LED) lamps. According to the "The Second Energy Fundamental Plan in Korea" published by the Korea Ministry of Trade, Industry and Energy in 2014, existing public fluorescent lamps will be entirely replaced with 100% LED lighting after 2020. Thus, enormous amounts of end-of-life fluorescent lamps will end up with disposal. It is important to properly manage and recycle the lamps due to the presence of mercury. In this study, dynamic flow analysis was conducted to estimate the flow of materials that are recycled or discarded through the use phase over time by considering the life span of the lamp product. Mass flow of mercury in the lamps was also examined by quantifying flow and stocks of the substance in a well-defined system based on mass balance approach. Dynamic flow analysis is used to quantify past material flows, establish the material flow patterns and apply the lifetime of the lamps, and the replacement rate in order to track the temporal changes in the material flows. Based on the results, the amount of end-of-life fluorescent lamps generated was estimated to be about 100 million in 2008, and is expected to gradually increase to 140 million in 2014 and then decrease to about 100 million in 2019. Mercury from the lamps has steadily declined from 2.19 ton-Hg in 2008. In 2030, the expected emission of fluorescent lamps was estimated at about 10 million, and mercury was estimated at only 22 kg- Hg. The flow of mercury in fluorescent lamps was expected to continually decrease by 2030 due to the increased LED replacement. It implies that the amount of mercury emissions to the environment is expected to sharply decline in the future.

A Comparative Study of End-of-Life Portable Batteries Management Between Korea, Japan, and Germany

( Yuree Kwon ),( Hyunhee Kim ),( Yeji Jang ),( Yong-chul Jang ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1

Batteries are classified as primary batteries that can not be charged, and secondary batteries that can be recharged for extended life. The primary batteries include alkalis-manganese battery, mercury battery, lithium battery, and others, while the secondary batteries cover nickel cadmium(Ni-Cd) battery, Nickel-metal hydride (Ni-MH) battery, lithium ion battery, lithium polymer battery, lead storage battery, and others. Because waste batteries may contain hazardous materials, improper disposal of such waste may result in adverse impacts on the environment and human health. Therefore, the disposal and recycling of waste batteries is becoming an important issue in waste management policy. This study conducted a comparative study of end-of-life portable batteries management between Korea, Japan, and Germany. The data required for this study were collected from the literature review, available statistics developed by the governments, discussion with the experts, survey and field visits to the local government office, and battery recycling facilities. In Korea, waste batteries have been included in EPR (Extended Producer Responsibility) policy since 2003 for effective recovery and recycling of the waste from consumers. In Japan, the primary battery is usually collected by local municipality, while the secondary battery is managed by the JBRC(Japanese Battery Recycling Cooperation). Germany has started the EPR system with four collection organizations of waste batteries such as GRS, REBAT, and ERP. The role of the organizations varies with different provinces, concentrating on collection, sorting, and recycling of waste batteries. Also, they carry out take-back system (Reverse Logistics), allowing distributors to collect back waste batteries from consumers for free. According to the results of the study, Japan's POM (Placed On Market) is the highest at 87,806 tons in 2015, followed by Germany (43,979 tons) and Korea (14,634 tons). Among them, Japan recycled 22,855 tons, Germany 19,142 tons and Korea only 2,906 tons. Germany (44.2%) have the highest collection rates followed by Japan (26.03%) and Korea (19.86%). There is a need for better effective collection efforts on waste batteries in Korea by adopting various collection programs including take-back by retailers, collection from industrial sectors, and economic incentives to consumers for more collection.

mmWave 네트워크 상에서 지향성 안테나를 이용한 적응형 빔 조절 기법

박현희(Hyunhee Park),권정혁(Jung-Hyok Kwon),강철희(Chul-Hee Kang) 한국통신학회 2011 한국통신학회 학술대회논문집 Vol.2011 No.6

대학 신입생의 생애목표 잠재프로파일에 따른 심리적 적응의 차이와 예측요인 탐색

권은영(Kwon, Eunyoung),정현희(Chung, Hyunhee) 한국청소년정책연구원 2021 한국청소년연구 Vol.32 No.4

본 연구는 대학 신입생의 생애목표 잠재프로파일을 분류하고, 분류된 생애목표 잠재프로파일에 따른 심리적 적응의 차이와 예측요인을 탐색하기 위해 실시되었다. 연구대상은 한국청소년정책연구원의 한국아동․청소년패널조사 2010(Korean Children and Youth Panel Survey 2010; KCYPS 2010) 중1 패널 7차년도 응답자 중에서 4년제 대학교 1학년에 재학 중인 여학생 478명(53.7%), 남학생 412명(46.3%) 총 890명이었다. 자료는 잠재프로파일 분석, 다변량 분산분석, 다항로지스틱 회귀분석을 통해 분석되었다. 이에 대한 연구결과는 다음과 같았다. 첫째, 대학 신입생의 생애목표 잠재프로파일은 다중목표 높은형(16.7%), 관계 추구형(31.7%), 다중목표 평균형(17.4%), 다중목표 낮은형(31.8%), 관계 외면형(2.4%)의 5가지 유형으로 분류되었다. 둘째, 대학 신입생의 생애목표 잠재프로파일에 따른 심리적 적응의 차이가 있었다. 다중목표 높은형은 자아존중감, 삶의 만족도에서 가장 높은 점수를 나타낸 반면, 다중목표 낮은형은 우울에서 가장 높은 점수를 나타냈다. 셋째, 대학 신입생의 생애목표 잠재프로파일 분류에 영향을 미치는 고등학교 시기의 예측요인으로는 성별, 진로정체감, 성취가치, 민주적 양육태도, 교우관계, 공동체의식이 유의한 것으로 확인되었다. 이러한 결과는 대학 신입생의 생애목표 잠재프로파일은 다양한 추구 양상을 보이며, 대학 신입생의 심리적 적응을 촉진하는데 개인차를 고려해야 함을 의미한다. 이와 같은 연구결과를 바탕으로 대학 신입생의 생애목표 발달 개입을 위한 방안과 함께 본 연구의 제한점 및 후속연구를 위한 제언을 논의하였다. The present study sought to categorize the latent profiles of college freshmen’s life goals, and to explore differences in psychological adjustment and predictors relating to such latent profiles. Data were collected from 890 college freshmen, who had participated in the Korean Children and Youth Panel Survey of 2010. The results were as follows: Firstly, the latent profiles of college freshmen’s life goals were categorized into five types, these being; ‘high multiple goals’, ‘relation oriented’, ‘average multiple goals’, ‘low multiple goals’, and ‘relation-neglected’. Secondly, there were significant differences in psychological adjustment relating to the latent profiles of college freshmen’s life goals. Thirdly, the predictive effects of gender, career identity, attainment value, democratic attitudes in parenting, peer relations, and community spirit were significant. Based on these results, the implications of the current study and suggestions to improve college freshmen’s life goals are discussed.

Comparison of Robotic Versus Laparoscopic Cyst Excision and Hepaticojejunostomy for Choledochal Cyst in Children: A Propensity Score Matched Study

Heewon Kim,Hyunhee Kwon,Suhyun Ha,Seong Chul Kim,Dae Yeon Kim,Jung-Man Namgoong 대한외과학회 2021 대한외과학회 학술대회 초록집 Vol.2021 No.11

A Spoofing Detection Scheme Based on Elevation Masked-Relative Received Power in GPS Receivers using Multi-band Array Antenna

Junwoo Jung,Hyunhee Won,Sungyeol Park,Haengik Kang,Seungbok Kwon,Byeongjin Yu,Seungwoo Seo 사단법인 항법시스템학회 2023 Journal of Positioning, Navigation, and Timing Vol.12 No.2

Many spoofing detection studies have been conducted to cope with the most difficult types of deception among various disturbances of GPS, such as jamming, spoofing, and meaconing. In this paper, we propose a spoofing detection scheme based on elevation masked-relative received power between GPS L1 and L2 signals in a system using a multi-band array antenna. The proposed scheme focuses on enabling spoofing to be normally detected and minimizes the possibility of false detection in an environment where false alarms may occur due to pattern distortion among elements of an array antenna. The pattern distortion weakens the GPS signal strength at low elevation. It becomes confusing to detect a spoofing signal based on the relative power difference between GPS L1 and L2, especially when GPS L2 has weak signal strength. We propose design parameters for the relative power threshold including beamforming gain, the minimum received power difference between L1 and L2, and the patch antenna gain difference between L1 and L2. In addition, in order to eliminate the weak signal strength of GPS L2 in the spoofing detection process, we propose a rotation matrix that sets the elevation mask based on platform coordinates. Array antennas generally do not have high usefulness in commercial areas where receivers are operated alone, but are considered essential in military areas where GPS receivers are used together with signal processing for beamforming in the direction of GPS satellites. Through laboratory and live sky tests using the device under test, the proposed scheme with an elevation mask detects spoofing signals well and reduces the probability of false detection relative to that without the elevation mask.