교량 성능 모델의 개발 및 업데이트

이진혁,이원우,공정식,Lee, Jin-Hyeok,Lee, Won-U,Gong, Jeong-Sik 한국전산구조공학회 2016 전산구조공학 Vol.29 No.1

온라인을 통한 태권도 품새 교육의 가능성 탐색

이진혁 ( Jin-hyeok Lee ),노형준 ( Hyoung-jun Noh ) 대한무도학회 2023 대한무도학회지 Vol.25 No.4

이 연구는 전 세계적으로 코로나바이러스가 확산하여 대면 교육이 어려웠던 상황에서 온라인을 통하여 태권도 품새 교육의 가능성을 확인하는 데 있다. 이를 위하여 각 국가를 대표하는 해외 품새 국가대표선수 6명과 해외 품새 국가대표 지도자 3명을 연구참여자로 선정하였다. 코로나바이러스가 확산 되는 시기인 2019년 12월부터 2021년 12월까지 관련 자료 수집, 일화 기록, 심층 면담 등을 통해 자료를 수집하였다. 해외 품새 국가대표 선수와 지도자에게 온라인 태권도 교육에 관한 경험과 인식에 대해 심층적인 자료를 구하였다. 이와 같이 수행된 이 연구의 결과는 다음과 같다. 첫째, 온라인을 통해 태권도 품새기술에 대한 교육 가능성을 확인하였다. 둘째, 온라인을 통해 태권도 품새 교육 시 선수의 심리적 부담에 대한 지원 가능성을 확인하였다. 셋째, 온라인을 통해 태권도 교육 활성화 가능성을 확인하였다. This study is to confirm the possibility of Taekwondo Poomsae education online in a situation where face-to-face education was difficult due to the spread of coronavirus around the world. To this end, six overseas Poomsae national athletes representing each country and three overseas Poomsae national leaders were selected as participants in the study. Data was collected through related data collection, anecdote records, and in-depth interviews from December 2019 to December 2021, when the coronavirus spread. In-depth data on the experience and perception of online taekwondo education were obtained from overseas Poomsae national players and leaders. The results of this study conducted in this way are as follows. First, the possibility of education on Taekwondo Poomsae technology was confirmed online. Second, the possibility of supporting the psychological burden of athletes during Taekwondo Poomsae education was confirmed online. Third, the possibility of activating taekwondo education was confirmed online.

고령인구를 고려한 폭염취약지 공간분석

이진혁(Jin-Hyeok Lee),김현정(Hyunjung Kim) 한국지역개발학회 2023 韓國地域開發學會誌 Vol.35 No.5

This study aims to derive heat wave vulnerable areas in consideration of the elderly population in Daegu Metropolitan City and find out which areas need to be managed in the future. For empirical analysis, basic variables, temperature rise variables, and temperature drop variables were selected. The elderly population density, heat shelter density, and heat accumulation days were analyzed as basic variables, and the elevation, slope direction, and land use status were analyzed as temperature rise variables, and rivers and ecological naturalness were analyzed as temperature drop variables. Kernel Density was used in Arc GIS to find out the density of the elderly population, and the cumulative number of days of heat waves was analyzed using interpolation techniques (IDW). Other variables were also analyzed and finally overlapped. As a result of the analysis, most of the areas surrounding Jung-gu, Daegu Metropolitan City, were vulnerable to heat waves, and considering the elderly population, Dalseo-gu, Buk-gu, and Suseong-gu were the most vulnerable areas. It can be seen that preparations should be made around the area, which can be used for future decisions such as urban planning and welfare for the elderly. 본 연구는 대구광역시를 대상으로 고령인구를 고려한 폭염취약지를 도출하고 추후 어떠한 지역을 중심으로 관리가 필요한지 알아보고자 한다. 실증 분석을 위해 기본 변수와 기온 상승에 영향을 미치는 변수, 기온 하강에 영향을 미치는 변수를 선정했다. 기본 변수로 고령인구 밀도와 무더위 쉼터 밀도, 폭염누적일수를 분석했으며, 도시 열 쾌적성을 보다 더 세밀하게 평가하기 위해 기온 상승에 영향을 미치는 변수로 표고, 사면 방향, 토지이용현황을 분석하고 기온 하강에 영향을 미치는 변수로 하천과 생태자연도를 분석했다. 고령인구 밀도를 알아내기 위해 Arc GIS에서 Kernel Density를 사용했으며, 폭염누적일수를 내삽법(IDW)을 활용하여 분석했다. 이 외의 변수들도 각각 분석하여 최종 중첩 분석했다. 분석 결과, 대구광역시 중구를 둘러싼 대부분의 지역에서 폭염취약지가 나타났으며, 고령인구를 고려했을 때 달서구와 북구, 수성구 일대가 가장 취약한 지역으로 나타났다. 해당 지역을 중심으로 대비가 이루어져야 함을 알 수 있으며, 이는 향후 관련된 도시계획, 노인복지 분야 등의 의사결정에 활용할 수 있다.

부신 우연종(adrenal incidentaloma)으로 진단된 부신 낭성 종양 고주파열치료 증례 1예

이진혁(Lee jin-hyeok),진미경(Jin mi-kyeong),정양화(Jeong yang-hwa) 대한초음파의료영상학회 2022 대한초음파의료영상학회 학술대회 초록집 Vol.6 No.1

개요 : 부신 우연종(adrenal incidentaloma)은 부신 질환을 의심할 만한 임상증상 없이, 다른 이유로 시행한 영상 검사에서 우연히 발견된 1cm 이상의 부신 종양을 말한다. 그 중에서도 부신 낭종의 발생률은 약 0.06~0.18%로 드문 질환이다. 모든 연령에서 발생할 수 있으나, 주로 40~60대에서 발생하며 남녀 비는 1:3으로 알려져 있다. 90%에서 일측성이며 대부분은 크기가 10cm 이하로 무증상이나, 50cm 이상의 큰 낭종이 발견되기도 한다. 부신 낭종이 발견되는 경우에는 일반적으로 수술적 절제술을 시행하여 악성유무를 판별하는 것이 중요한 것으로 알려져 왔다. 그러나 부신 낭종의 약 7%만이 악성이거나 악성화 가능성이 있으므로 환자가 연약하거나 수술을 원하지 않을 경우, 영상검사에서 양성의 소견을 보이고 호르몬 검사에서 비기능성인 경우에는 부신을 적출하지 않고 배액만 하는 방법도 제시되고 있다. 수술에 비해 부신에 인접한 신장, 폐, 췌장 등 정상조직에 피해가 적고, 출혈이나 감염 등의 합병증 발생 가능성이 낮다. 본 증례에서는 초음파 유도 하 고주파열치료와 배액술을 동반하여 부신 낭종을 치료하는 시술법을 통한 성공적인 시술 사례를 보고하고자 한다. 증례 : 환자는 61세 남성으로 5년 전 초음파상 우측 부신에 3.5cm의 낭종이 발견되었고, 2018년 5.9cm가량으로 크기 증가하여 수술여부를 환자가 선택하라고 들었으나 수술하지 않고 지내다 2021.01 CT상 7cm로 크기 증가하여 수술을 권유 받아 내원하였다. 기능성 부신 종양의 가능성을 배제하기 위하여 시행한 24시간 소변의 바닐만데릭산(vanillymandelic acid, VMA)과 메타네프린 검사, 혈청의 부신피질자극호르몬(ACTH), 그리고 코르티졸, 알도스테론 수치는 정상이었다. 과거력은 고혈압과 고지혈증이 있었으며, 가족력과 수술 경력은 없었다. 초음파 검사상 right adrenal gland에 septated cystic lesion이 보이며 septum에 의해 3개의 chamber로 분리되어 있고, septal wall calcification을 동반하고 있었다. 이에 MRI 검사 후 양성 낭종으로 판단되어 고주파열치료를 시행하기로 했다. 병변에 대해 18G Westcott needle을 이용하여 110ml의 노르스름한 장액혈액을 배액한 후 팁 길이 조절 가능한 17G proteus electrode를 이용하여 16분간 고주파열치료를 시행했다. 시술 직후 시행한 CT검사에서 지난 MRI과 비교하여 낭종의 크기가 4.1cm로 현저히 작아졌다. 퇴원 3개월 후 시행한 CT에서는 2.7cm로 더욱 작아진 것을 확인할 수 있었다. 이후 정기적인 혈액검사와 CT검사로 추적조사 중이다. 결론 : 경피적 배액술과 고주파열치료를 병행하는 시술은 단순한 낭종에 대한 효과적인 치료법이다. 특히, 연약한 환자나 수술을 원하지 않는 환자에게 수술 대안 방법으로 유용할 것으로 생각된다. Introduction : Adrenal incidentaloma refers to an adrenal tumor of 1cm or larger that is incidentally discovered on imaging tests performed for other reasons without clinical symptoms. Among them, the incidence rate of adrenal cysts is about 0.06 to 0.18%, which is a rare disease. It can occur at any age, but it mainly occurs in the 40s to 60s, and the male to female ratio is known to be 1:3. It is unilateral in 90% of cases, and most are asymptomatic with a size of less than 10cm, but large cysts greater than 50cm are sometimes found. When an adrenal cyst is found, it has been known to be important to determine whether it is malignant by performing surgical resection in general. However, only about 7% of adrenal cysts are malignant or potentially malignant, so if the patient is frail or does not want surgery, if the imaging test shows a positive result and the hormone test is non-functional, a method of draining only without removing the adrenal glands has been suggested. Compared to surgery, there is less damage to normal tissues such as the kidney, lung, and pancreas adjacent to the adrenal gland, and the possibility of complications such as bleeding or infection is low. In this case, we report a successful procedure to treat adrenal cyst using ultrasound-guided radiofrequency ablation and drainage. Case presentation : A 61-year-old male patient was diagnosed with a 3.5cm cyst in the right adrenal gland on ultrasound 5 years ago, and in 2018, the size increased to about 5.9cm, and the patient told to choose whether to have surgery, but after not undergoing surgery, the size increased to 7cm on a CT scan on 2021.01 and surgery was recommended. To rule out the possibility of a functional adrenal tumor, 24-hour urine vanillymandelic acid(VMA) and metanephrine tests, serum adrenocorticotropic hormone(ACTH), cortisol, and aldosterone levels were normal. There was a history of hypertension and hyperlipidemia, and there was no family history or surgical history. On ultrasound examination, a septated cystic lesion was seen in the right adrenal gland, separated into three chambers by a septum, and accompanied by septal wall calcification. Therefore, after an MRI scan, it was determined that the cyst was benign and radiofrequency ablation was performed. For the lesion, 110 ml of serosanguineous yellowish-colored fluid was drained using an 18G Westcott needle, and RFA was performed for 16 minutes using a 17G proteus electrode with adjustable active tip. In CT scan performed immediately after the procedure, the size of the cyst was significantly reduced to 4.1cm compared to the previous MRI. A CT scan performed 3 months after discharge confirmed that is was even smaller to 2.7cm. Since then, regular blood tests and CT scans have been carried out for follow-up. Conclusion : A combination of percutaneous drainage and radiofrequency ablation is an effective treatment for simple cysts. In particular, it is thought to be useful as an alternative to surgery for patients who are weak or do not want surgery.

항공용 티타늄 합금 가공 공정의 지속가능성 평가

이진혁(Jin-Hyeok Lee),김호영(Ho-Yung Kim),윤해성(Hae-Sung Yoon) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.12

Titanium alloys have been spotlighted in numerous industries owing to their superior mechanical properties, such as high specific strength. However, the high heat and wear resistance of titanium alloys also lower their machinability and limit the wider application of the material. Many researchers have investigated the processing of titanium alloys, and it is required to evaluate the effectiveness and efficiency of developed technologies. From this perspective, this research studied sustainability in titanium alloy machining. The power consumption of the machine was measured during the process and analyzed in terms of process parameters and individual machine components. Here, an end mill specially designed for titanium was also investigated and compared with a general-purpose cutting tool. Based on the experimental results, a model was constructed to predict the power consumption of the overall process. It is expected that this study will contribute to the more effective and efficient processing of titanium alloys.

항공용 티타늄 합금 가공전략의 지속가능성 평가를 위한 가공 품질 연구

이진혁(Jin-Hyeok Lee),김호영(Ho-Yung Kim),윤해성(Hae-Sung Yoon) 한국항공우주학회 2019 한국항공우주학회 학술발표회 논문집 Vol.2019 No.4

수온별 조피볼락(Sebastes schlegeli) 치어의배합사료 적정 공급횟수

이진혁 ( Jin Hyeok Lee ),이봉주 ( Bong Joo Lee ),김강웅 ( Kang Woong Kim ),한현섭 ( Hyon Sob Han ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6

We conducted two feeding trials to investigate the optimal feeding frequency of juvenile Korean rockfish Sebastes schlegeli fed a commercial diet of expanded pellets containing 47.2% crude protein, 9.2% crude lipid, and 14.5% ash at two different water temperatures. In the first experiment, triplicate groups of 20 fish with an average weight of 2 g were fed an equal amount of diet (5.97%based on body weight) at one of six feeding frequencies (2, 3, 4, 5, 7, or 9 meals/day) for four weeks at 17.5˚C. After four weeks,we measured weight gain (WG), specific growth rate (SGR), feeding efficiency (FE), and protein efficiency ratio (PER). Fish fed diet five meals/day grew significantly better than those fed nine meals/day. The second experiment used identical experimental conditions and feeding regions, except the food ration was slightly less (5.92% based on body weight) and the water temperature was increased to 20˚C. After four weeks, we again measured WG, SGR, FE and PER. Fish fed seven meals/day grew significantly faster than those fed 2, 3, 4, or 9 meals/day. Whole-body protein levels in fish fed three meals/day was higher than those fed four meals/day in 17.5˚C water, but whole-body lipids in the fish fed four meals/day was higher than those fed two meals/day in 20˚C water. A second-order polynomial analysis based on WG suggested the optimal feeding frequency for juvenile Korean rockfish was five meals/day at 17.5˚C and six meals/day at 20˚C, indicating that fish reared in higher water temperature require higher feeding frequencies.

북한이탈주민의 인권감수성에 관한 연구

이진혁 ( Jin Hyeok Lee ),최정민 ( Jeong Min Choi ) 성결대학교 다문화평화연구소 2020 다문화와 평화 Vol.14 No.3

본 연구는 북한이탈주민의 인권감수성 수준과 인권감수성에 영향을 미치는 요인을 분석하여, 향후 북한이탈주민의 인권감수성 향상을 위한 대안을 제시하는 것을 목적으로 한다. 이를 위해 한국에 정착한 북한이탈주민 145명을 대상으로 설문조사를 실시하였다. 연구결과, 첫째, 북한이탈주민의 전체 인권감수성은 평균 이하의 낮은 수준을 보였으며, 인권감수성의 하위요인인 상황·결과·책임지각별 수준에서는 상황지각력이 가장 낮게 나타났다. 둘째, 각 인권상황 에피소드별 인권감수성 수준을 살펴본 결과, 장애인의 신체 자유권, 정신질환자의 사생활권, 구금으로부터의 자유권과 같은 인권상황에서는 점수가 낮았다. 또한 이주노동자의 노동권은 상황·결과지각력 점수는 높았으나 책임지각력 점수는 낮게 나타났다. 셋째, 인권감수성에 영향을 미치는 요인을 분석한 결과, 인권교육 경험이 많을수록 인권감수성에 긍정적인 영향을 미치는 것으로 나타났다. 이는 북한이탈주민을 대상으로 한 인권교육의 필요성을 시사한다. 하나원과 같은 북한이탈주민 대상 교육기관에서는 인권교육 진행시에 다양한 에피소드를 활용한 교육과 인권적 관점에서 문제를 바라볼 수 있는 인지능력 향상 위주의 교육이 마련되어야 할 것으로 보인다. This study analyzes the level of human rights sensitivity and the factors affecting human rights sensitivity of North Korean defectors. This aims to present alternatives for improving the human rights sensitivity of North Korean defectors in the future. For this, a survey was conducted on 145 North Korean defectors who settled in South Korea. As a result of the study, first, the total human rights sensitivity of North Korean defectors was lower than the average. In the sub-factors of human rights sensitivity (situation, outcome, responsibility perception), situation perception was the lowest. Second, as a result of examining the level of human rights sensitivity for each episode of human rights situation, the score was low in human rights situations such as the right to physical freedom of the disabled, the right to privacy of the mentally ill, and the right to freedom from detention. Also, for migrant workers' labor rights, the score of situation and outcome perception was high, but the score of responsibility perception was low. Third, as a result of analyzing the factors affecting human rights sensitivity, it was found that the more experience in human rights education, the more positively the human rights sensitivity was affected. This implies the need for human rights education for North Korean defectors. Educational institutions for North Korean defectors such as Hanawon should provide education using various episodes during human rights education and education focused on improving cognitive ability to look at problems from a human rights perspective.

조피볼락(Sebastes schlegeli) 치어의 배합사료 적정 공급률과공급횟수

이진혁 ( Jin Hyeok Lee ),김강웅 ( Kang Woong Kim ),이봉주 ( Bong Joo Lee ),박건현 ( Gun Hyun Park ),이준호 ( Jun Ho Lee ),윤현호 ( Hyeon Ho Yun ),배승철 ( Sung Chul Bai ) 한국수산과학회 2013 한국수산과학회지 Vol.46 No.6

Two feeding trials were conducted to investigate the effects of feeding rate and frequency on growth performance and body composition of juvenile Korean rockfish Sebastes schlegeli reared at 15.0±0.3°C. In the first trial, three replicate fish groups averaging 2.07±0.03 g were fed a commercial diet with one of seven different daily feeding rates: 1.00%, 2.00%, 2.50%, 2.75%, 3.00%,3.25%, and satiation (3.34%) based on body weight (BW). After four weeks of feeding, fish fed the 3% diet showed significantly higher weight gain (WG) and feed efficiency (FE) than fish that received the other feeding rates. In the second trial, the optimum feeding frequency was evaluated with three replicate fish groups averaging 2.04±0.03 g. Fish were fed a commercial diet at 2.87%BW with six different daily feeding frequencies: 2, 3, 4, 5, 7, or 9 meals. After four weeks of feeding, WG, specific growth rate, FE,and protein efficiency rate in fish fed 3 meals d-1 were significantly higher than those of fish fed 7 or 9 meals d-1. In both feeding trials,proximate composition of the entire body changed depending on the feeding rate or frequency. A broken-line regression analysis based on weight gain suggested that the optimum daily feeding rate and frequency for juvenile Korean rockfish at 15°C was 2.9%BW d-1 and 2?3 meals d-1, respectively.

하이브리드 전기자동차에서 직류 전압 수준에 따른 전력변환시스템의 효율 분석

이진혁(Jin-Hyeok Lee),백성훈(Sung-Hoon Back),김상훈(Sang-Hoon Kim) 전력전자학회 2015 전력전자학술대회 논문집 Vol.2015 No.11