위성항법 서비스와 요소 기술의 진화

장진혁,임철순,김수경,조현우,정병기,김종필 한국전자파학회 2024 전자파기술 Vol.35 No.2

조직 내 정치적 행동 지각과 이직의도 간의 관계: 스트레스, 조직몰입의 매개효과와 정직성의 조절효과

장진혁,유태용 한국산업및조직심리학회 2013 한국심리학회지 산업 및 조직 Vol.26 No.3

본 연구의 목적은 첫째, 조직 내 정치적 행동 지각과 스트레스가 이직의도에 미치는 영향을 살펴보고, 둘째, 스트레스와 조직몰입이 조직 내 정치적 행동 지각과 이직의도 간의 관계를 매개하는지 살펴보고, 셋째, 조직 내 정치적 행동 지각이 스트레스에 미치는 영향에 있어서 정직성의 조절효과를 검증하는 데 있었다. 이를 위하여 국내 기업에서 근무하는 종업원들에게 설문조사를 실시하여 총 203명의 응답 자료를 분석에 사용하였다. 자료를 분석한 결과, 조직 내 정치적 행동 지각과 스트레스는 이직의도와 정적으로, 관련이 있었다. 스트레스와 조직몰입은 조직 내 정치적 행동 지각과 이직의도 간의 관계에서 순차적인 매개역할을 하였다. 또한 정직성이 낮을 때 보다 높을 때 조직 내 정치적 행동 지각과 스트레스 간의 정적 관계가 더 강하게 나타났기 때문에 정직성이 조직 내 정치적 행동 지각과 스트레스 간의 관계를 조절한다는 것이 밝혀졌다. 이러한 연구 결과를 토대로 본 연구의 시사점, 제한점 및 추후 연구과제에 대해 논의하였다.

금융데이터의 성능 비교를 통한 연합학습 기법의 효용성 분석

장진혁,안윤수,최대선,Jang, Jinhyeok,An, Yoonsoo,Choi, Daeseon 한국정보보호학회 2022 정보보호학회논문지 Vol.32 No.2

Current AI technology is improving the quality of life by using machine learning based on data. When using machine learning, transmitting distributed data and collecting it in one place goes through a de-identification process because there is a risk of privacy infringement. De-identification data causes information damage and omission, which degrades the performance of the machine learning process and complicates the preprocessing process. Accordingly, Google announced joint learning in 2016, a method of de-identifying data and learning without the process of collecting data into one server. This paper analyzed the effectiveness by comparing the difference between the learning performance of data that went through the de-identification process of K anonymity and differential privacy reproduction data using actual financial data. As a result of the experiment, the accuracy of original data learning was 79% for k=2, 76% for k=5, 52% for k=7, 50% for 𝜖=1, and 82% for 𝜖=0.1, and 86% for Federated learning.

공업용수 공급량 산정의 적정성에 대한 평가

장진혁,장형준,이호진 한국방재안전학회 2022 한국방재안전학회 논문집 Vol.15 No.2

The adequacy of industrial water supply is one of the core elements of the construction of industrial complexes. This study examined the supply of industrial water through various ways, according to the planning and creation of industrial complexes and the operating utilization rate of tenant companies oksan industrial complex. As for calculating the supply of industrial water and establishing water supply plan, the basic data analysis and the land use plan are utilised. The adequacy of calculating the basic unit by industry, which is the basis for calculating industrial water, was evaluated. In addition, analyzed industrial water usage data and the raw unit of each industry was compared with the actual data from the Oksan Industrial Complex, which selected as the research target area among the industrial complexes in Cheongju-si administrative districts, where actual data can be secured. The result of the study shows that the peak load rate of industrial water was found to have the peak load of more than twice as the result of analyzing the actual usage, and the basic unit of industrial water industry showed a significant difference from the actual usage. In particular, the decreasing rate of the basic units was significant comparing the increasing rate of basic units. In addition, the raw unit of the industry that uses more water decreased significantly, and the raw unit of the industry that uses less water increased slightly.

자동 기타 튜닝을 위한 장력 제어기 설계 연구

장진혁,이수언,최진일,이상권,이원구 제어로봇시스템학회 2020 제어로봇시스템학회 국내학술대회 논문집 Vol.2020 No.7

마그네트론 스퍼터링을 이용하여 TiN 박막을 증착한 도전성 섬유

장진혁,문선우,김경훈,김성민,이승민,김정수,한승희 한국진공학회 2013 한국진공학회 학술발표회초록집 Vol.2013 No.2

한국지역에서 GPS와 Beidou의 위성 가시성 및 고앙각 위성 분석

장진혁,김홍표,안종선,허문범,성상경,이영재 한국항행학회 2018 韓國航行學會論文誌 Vol.22 No.6

Globally, global navigation satellite system (GNSS) is being developed and operated in advanced countries. China's Beidou is developing rapidly, starting with global positioning system (GPS), which is the most representative system. In this paper, we analyze the visibility of Beidou satellite in Korea at present time to utilize rapidly changing Beidou. In this analysis, it is compared with GPS which is stable service. The results of the visibility analysis are based on the results of the mask angle (the low elevation satellite exclusion angle) and the result of the skyplot (a visual representation of the position of the satellite at the user location). Visibility analysis shows that the high elevation angle of Beidou satellite is higher than that of GPS satellite in Korea. In addition, GPS and Beidou's availability and positioning accuracy analysis are performed to confirm the effect of increasing elevation angle satellites. According to the results, Beidou is more effective than GPS in using high elevation satellites in Korea. 세계적으로 GNSS (global navigation satellite system)는 선진국에서 개발 및 운용 중에 있다. 가장 대표적인 시스템인 GPS (global positioning system)을 시작으로 현재 중국의 Beidou가 빠르게 발전하고 있다. 본 논문에서는 빠르게 변화하는 Beidou의 활용을 위해 현재 시점의 한국지역에서 Beidou 위성의 가시성 분석을 수행한다. 이렇게 수행되는 분석에서 안정적으로 서비스 되고 있는 GPS와 비교하며 진행하도록 한다. 가시성 분석은 mask angle (저앙각 위성 배제 각도)에 따른 결과, skyplot (사용자 위치에서 위성의 위치를 가시적으로 표현하기 위한 그림)을 통한 결과를 수행하였다. 가시성 분석을 통해 한국지역에서 GPS위성에 비해 Beidou 위성의 고앙각 배치가 많아지는 것을 확인 할 수 있다. 또한 고앙각 배치가 많아지는 것의 효과를 확인하기 위해 GPS와 Beidou의 가용성 및 위치정확도 분석을 수행한다. 수행 결과에 따라 한국지역에서 고앙각 위성을 활용 할 시 GPS보다 Beidou가 더 효과적일 것으로 확인된다.

Activin Receptor-Like Kinase 5 Inhibitor Attenuates Fibrosis in Fibroblasts Derived from Peyronie’s Plaque

장진혁,류지간,서준규 대한비뇨의학회 2012 Investigative and Clinical Urology Vol.53 No.1

Purpose: Transforming growth factor-b1 (TGF-b1) is the key fibrogenic cytokine associated with Peyronie’s disease (PD). The aim of this study was to determine the antifibrotic effect of 3-((5-(6-Methylpyridin-2-yl)-4-(quinoxalin-6-yl)-1H-imidazol-2-yl) methyl)benzamide (IN-1130), a small-molecule inhibitor of the TGF-b type I receptor activin receptor-like kinase 5 (ALK5), in fibroblasts isolated from human PD plaque. Materials and Methods: Plaque tissue from a patient with PD was used for primary fibroblast culture, and we then characterized primary cultured cells. Fibroblasts were pretreated with IN-1130 (10 mM) and then stimulated with TGF-b1 protein (10 ng/ml). We determined the inhibitory effect of IN-1130 on TGF-b1-induced phosphorylation of Smad2 and Smad3 or the nuclear translocation of Smad proteins in fibroblasts. Western blot analyses for plasminogen activator inhibitor-1, fibronectin, collagen I, and collagen IV were performed to evaluate effect of IN-1130 on the production of extracellular matrix proteins. Results: The treatment of fibroblasts with TGF-b1 significantly increased phosphorylation of Smad2 and Smad3 and induced translocation of Smad proteins from the cytoplasm to the nucleus. Pretreatment with IN-1130 substantially inhibited TGF-b1-induced phosphorylation of Smad2 and Smad3 and nuclear accumulation of Smad proteins. The TGF-b1-induced production of extracellular matrix proteins was also significantly inhibited by treatment with IN-1130 and returned to basal levels. Conclusions: Overexpression of TGF-b and activation of Smad transcriptional factors are known to play a crucial role in the pathogenesis of PD. Thus, inhibition of the TGF-b signaling pathway by ALK5 inhibitor may represent a promising therapeutic strategy for treating PD. Purpose: Transforming growth factor-b1 (TGF-b1) is the key fibrogenic cytokine associated with Peyronie’s disease (PD). The aim of this study was to determine the antifibrotic effect of 3-((5-(6-Methylpyridin-2-yl)-4-(quinoxalin-6-yl)-1H-imidazol-2-yl) methyl)benzamide (IN-1130), a small-molecule inhibitor of the TGF-b type I receptor activin receptor-like kinase 5 (ALK5), in fibroblasts isolated from human PD plaque. Materials and Methods: Plaque tissue from a patient with PD was used for primary fibroblast culture, and we then characterized primary cultured cells. Fibroblasts were pretreated with IN-1130 (10 mM) and then stimulated with TGF-b1 protein (10 ng/ml). We determined the inhibitory effect of IN-1130 on TGF-b1-induced phosphorylation of Smad2 and Smad3 or the nuclear translocation of Smad proteins in fibroblasts. Western blot analyses for plasminogen activator inhibitor-1, fibronectin, collagen I, and collagen IV were performed to evaluate effect of IN-1130 on the production of extracellular matrix proteins. Results: The treatment of fibroblasts with TGF-b1 significantly increased phosphorylation of Smad2 and Smad3 and induced translocation of Smad proteins from the cytoplasm to the nucleus. Pretreatment with IN-1130 substantially inhibited TGF-b1-induced phosphorylation of Smad2 and Smad3 and nuclear accumulation of Smad proteins. The TGF-b1-induced production of extracellular matrix proteins was also significantly inhibited by treatment with IN-1130 and returned to basal levels. Conclusions: Overexpression of TGF-b and activation of Smad transcriptional factors are known to play a crucial role in the pathogenesis of PD. Thus, inhibition of the TGF-b signaling pathway by ALK5 inhibitor may represent a promising therapeutic strategy for treating PD.

한글판 Birchwood Insight Scale의 표준화 연구

장진혁,이남영,김용식,박상원 대한신경정신의학회 2019 신경정신의학 Vol.58 No.1

Objectives In the treatment of schizophrenia, treatment compliance is an important prognostic factor. As insight has a significant impact on treatment compliance, an appropriate assessment of insight is essential in the treatment of schizophrenia. This study examined the reliability and validity of the Korean version of Birchwood Insight Scale (BIS). Methods Fifty seven adult patients diagnosed with schizophrenia according to DSM-5 were recruited from a university hospital. They were evaluated using the Positive and Negative Syndrome Scale (PANSS), The Scale to Assessment Unawareness of Mental Disorder (SUMD) and BIS. Explorative factor analysis was performed to examine the construct validity of the Korean version of BIS. Concurrent validity was evaluated by a comparison with the PANSS G12 item and SUMD. The test-retest correlation was evaluated to examine the test-retest reliability. Multiple regression analysis was performed to examine the variables affecting insight. Results: Explorative factor analysis showed that the Korean version of BIS was composed of 2 factors, which are ‘Awareness of symptoms’ and ‘Awareness of illness and need for treatment.’ The Korean version of BIS was reliable in terms of the internal consistency. Concurrent validity with the PANSS G 12 item and SUMD was statistically significant. The test-retest reliability was also statistically significant. Multiple regression analysis showed that the PANSS negative factor affects the BIS score, indicating that negative symptoms of schizophrenia may impair insight of the illness. Conclusions This study suggests that the Korean version of BIS is a valid and reliable tool for assessing the insight of patients with schizophrenia.

내시경으로 진단 및 치료한 총담관 내 관상 선종 1예

장진혁,이동기,노태웅,김민수,이근만,이세준,이상인,양석우 대한소화기내시경학회 2005 Clinical Endoscopy Vol.31 No.3

간외 담도 종양 중 양성 종양은 6% 정도로 악성 종양에 비해 드물게 발견된다. 양성 종양은 십이지장 유두부에 가장 호발하며, 다음으로 총담관에서 발견된다. 총담관 양성 종양은 증상 및 검사 소견이 담석 및 악성 종양과 유사하여 수술 전 진단하기 어렵기 때문에 총담관의 양성 종양은 주로 수술 후 병리학적으로 진단되나 수술 고위험군 환자를 내시경으로 치료한 예도 보고된 바 있다. 국내에서도 총담관 양성 종양 중 융모성 선종 등은 여러 차례 보고되었으나 아직까지 관상 선종을 경피경간 담도내시경 직시하에 치료한 보고는 없었다. 저자 등은 복부초음파와 자기 공명 담췌도 영상에서 총담관 담석과 감별이 어려웠으나, 유두괄약근 절개 후 바스켓으로 적출된 조직에서 관상 선종을 확인하고, 경피경간 담도 내시경 직시 하에 담도 종양을 내시경으로 부분 제거하였던 총담관 관상 선종 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Biliary adenoma of the common bile duct is a rare disease found in biliary tract encounterd in biliary mass lesion, and it is difficult to differentiate from their malignant counterparts. Symptoms and signs of these tumors can mimic choleliathiasis and malignant tumors. Therefore, this tumor is rarely diagnosed preoperatively. In addition, there has been no reported case of a tubular adenoma of the common bile duct in Korea, until recently. We experienced a case of tubular adenoma of the common bile duct, which was diagnosed and partially resected by percutaneous transhepatic cholangioscopy. The patient was a 84-year-old male who showed abnormal liver function test. Abdominal ultrasonography showed a dilated common bile duct, and a soft tissue was observed on endoscopic retrograde cholangiography. This was initially thought as a stone, but it became partially detachable from the common bile duct during an endoscopic retrograde cholangioscopic basket removal. The mass lesion was partially resected by a percutaneous transhepatic cholangioscopic snare. This resected tissue was confirmed as a tubular adenoma.