단기간의 Amiodarone 투여 후 발생한 급성 폐독성 1예 -증례 보고-

김정혁,전해리,정진성,유승현,고규한,고영민,김정혁 대한중환자의학회 2011 Acute and Critical Care Vol.26 No.2

Amiodarone is one of the most commonly prescribed antiarrhythmic drug for almost all atrial or ventricular arrythmias. Amiodarone-induced pulmonary toxicity (APT) was first described in 1980 and has potentially serious side effects that are believed to develop in 5% of patients. In general, APT occurs only when high amiodarone doses are used for a long time. However, during short-term therapy of amiodarone, APT is rarely reported. In this report, we describe a case of amiodarone-induced pulmonary toxicity after a short course of amiodarone therapy for atrial fibrillation.

Matlab/Simulink를 이용한 단일건물의 에너지소비량 모델링

김정혁,김호찬,부창진 제어로봇시스템학회 2012 제어로봇시스템학회 국내학술대회 논문집 Vol.2012 No.4

군 통합물류체계 구축을 위한 SCOR모델 도입방안 연구

김정혁,최석철,Kim, Jeong-Hyeok,Choi, Seok-Cheol 한국국방경영분석학회 2005 한국국방경영분석학회지 Vol.31 No.1

The SCOR(supply chain operations reference) model which is a management tool, has been developed to describe the business activities associated with all phases of satisfying a customer's demand. The model is able to successfully describe and provide a basis for supply chain improvement. In this paper, we review the SCOR model, the present status of the Korean defense logistics system, and suggest an application of the model for the integrated defense logistics system.

스리랑카 탕갈레 지역 응급의료센터 지원 전과 후의 환자의 응급센터 선택 속성과만족도 변화

김정혁,안무업,김동원,이태헌,한재현,홍은석,이강현,김훈식 대한응급의학회 2015 大韓應急醫學會誌 Vol.26 No.1

Purpose: After creating a new emergency medical service in Tangalle, Sri Lanka, this analysis intends to determine the changes of satisfaction related to the facility and medical care givers. With this information, an assessment regarding the role of PCU (preliminary care unit) and the contribution of PCU is made possible. Furthermore, the baseline data can be used for further development. Methods: PCU survey was conducted before and after the establishment on site at Tangalle, Sri Lanka. Patients were surveyed based on a five point Likert scale. Patients were asked to rate their level of satisfaction with doctors, facilities, and the environment in the hospital. Results: After the establishment of PCU the number of patients increased by 270% (from 11,496 patients in Year 2011 to 31,120 patients in Year 2014). The number of patients returning home also increased from 2412 to 14,315. Prior to the establishment of PCU, the choice of visiting emergency centers was based on the following order: Kindness of doctors, quality of medical treatment, kindness of nurses. After the establishment of PCU, the choice of visiting emergency centers was changed: From ranking 7th to 2nd, cleanliness of hospital facilities. From ranking 19th to 9th, amenities. Satisfaction ratings regarding the patients’ perspective of doctors have not changed. However, the satisfaction ratings of the following have changed statistically: From ranking 9th to 2nd, admission process was simple. From ranking 8th to 3rd, PCU had proper medical devices and equipment. From 6th to 5th, received the results of tests quickly. On the other hand, the satisfaction rating for waiting time was pushed back from 7th to 10th. Conclusion: After establishment of the PCU, positive indications were: increase in the number of patients, increase in the capacity to receive patients, and increase in satisfaction with the facility. The level of satisfaction regarding the medical staff was unchanged. The level of satisfaction regarding waiting time was decreased.

공급사슬망 설계를 위한 수리모형 수립 및 응용

김정혁,김대기 한국경영과학회 2004 經營 科學 Vol.21 No.3

Great effort has been exerted to redesign the supply chain network as a means to improve corporate competitiveness. In this study, we present a mathematical model and a solution system to help redesign corporate logistics networks. The objective of the model is to minimize total logistics costs. We applied the solution system to real problem cases. We use the model and the concept to develop decision support system that is based on C++ with the use of CPLEX callable library as a solution engine. We tested and verified the DSS for redesigning the network of a large Korean electronics company. Through various scenario analyses, we recommend to redesign their supply chain network that demonstrates the possibility of substantial logistics cost savings.

총괄평가 개념의 한국군 적정 상비병력 산출 방안 연구

김정혁,최명진 한국산업경영시스템학회 2023 한국산업경영시스템학회지 Vol.46 No.4

For the past 70 years, an intense rivalry has persisted on the Korean Peninsula, and North Korea's nuclear and missile threats are becoming increasingly imminent. Facing a shortage of military resources, South Korea has pursued a national defense reform, significantly reducing the number of units and troops while focusing on ground forces. However, North Korea's strategic objective of unifying South Korea through surprise attacks, prompt responses, and combined nuclear and missile assaults remains unchanged. The central issue in this context revolves around determining the appropriate size of the Korean military's standing forces. This study employs the concept of net assessment as a novel method to ascertain the optimal size of the Korean military. Threats, strategic objectives, doctrine, and unit rotations are simultaneously considered from the enemy's perspective. In anticipation of security risks on the Korean Peninsula, an acceptable troop size will be proposed using the net assessment approach to calculate the appropriate standing force size.

유방의 비정형유관사이증식증: 방사선학적 소견과 병리학적 소견의 연관성

김정혁,오유환,Kim, Jeong-Hyeok,O, Yu-Hwan 대한영상의학회 2003 대한영상의학회지 Vol.49 No.4

Purpose: To evaluate the clinical and radiologic findings of atypical ductal hyperplasia (ADH) using mammography and ultrasonography, and to correlate the radiologic and histopathologic findings. Materials and Methods: Sixty-four pathologically proven lesions in 64 patients who were examined between March 2000 and March 2003 were the subject of this study. Mammography was performed in all 64 cases, and ultrasonography in 30. Two radiologists retrospectively evaluated the radiologic findings, classifying them as one of four types: mass, microcalcification, other finding, and no detected lesion. At mammography, masses were classified according to their shape, margin, and density and microcalcifications according to their shape and distribution. At ultrasonography, masses were evaluated in terms of their shape, margin, internal and posterior echotexture, ductal extension, and parallelism to skin. Geographic correlation between the radiologic and histopathologic findings was classified as direct, near direct, or remote correlation. Results: Mammography demonstrated 37 cases of microcalcification (57.8%), 14 in which masses were present (21.9%), two in which there were other findings (3.1%), and 11 in which lesions were not detected (17.2%). The "other finding" was ductectasia. Microcalcifications were round in 19 cases, pleomorphic heterogeneous in 16, and branching linear in one. The most common distribution of microcalcification was clustered (29 cases; 78.4%). Masses were oval or round in nine cases and irregular in three, and in seven cases their margin was ill-defined. In 13 cases, the density of the masses was equal to that of breast tissue. Ultrasonography showed that the masses were round or oval in 15 cases and irregular in 14, and that the margin was ill-defined in 16 cases and circumscribed in ten. In 19 cases, the echotexture of the masses was low, and in 20 cases, heterogeneous. Parallel orientation was seen in 25 cases, and ductal extension in 22. Category 4 was the most common final assessed BI-RADS category, found in 75% of cases. Radiologic-histopathologic correlation was direct in 44 cases, near direct in 13, and remote in seven. Clinically, self or clinical examination of the breast revealed no abnormality in 47 cases, a palpable mass in seven, nipple discharge in seven, and breast pain in three. Conclusion: At mammography, the most common finding of ADH was clustered round or pleomorphic heterogeneous microcalcifications, and at ultrasonography, illdefined, round or oval, or irregular-shaped, hypoechoic masses with parallel orientation and ductal extension. Clinically, most ADH was incidentally discovered at radiologic examination. In this study, 17.2% of ADH cases were not demonstrated by mammography but were detected at ultrasonography, and for the detection of ADH, the use of this latter modality, alongside mammography, is thus feasible.

X선사진 증례별 판독 포인트 : 골질환

김정혁 동아엑스선기계 방사선기술연구소 1994 화상연구 Vol.2 No.3

고밀도 플라즈마 반응성 스퍼터링법으로 증착한 TiNX박막의 기판온도 영향에 따른 미세구조 및 내부식성 특성연구

김정혁,박지봉,송풍근 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11

모형을 이용한 CT상의 폐결절 크기계측에 관한 연구

김정혁,정원균,서원혁 고려대학교 의과대학 1987 고려대 의대 잡지 Vol.24 No.1

It has been well known that the role of computed tomography (CT) to evaluate pulmonary nodules, concerning CT attenuation values, size determination, and edge patterns. Although the assessment of the size of pulmonary nodules is not sufficiently accurate to distinguish benign from malignant lesions, the measurement of the real size of the lesion is still being stressed on CT examination. Many authors have indicated that solitary pulmonary nodules (SPNs), measured by 2.0㎝ or less in diameter, were more apt to be benign. And lung cancers which were less than 3.0 ㎝ in the greatest diameter have been considered T1 lesion on the base of TNM system (The American Joint Comitte for Cancer Staging), while tumors more than 3.0㎝ have already been T2 lesion. But as the CT is a synthetic image, the size of the lesion displayed on CT are greatly influenced by various factors. The author designed a chest and lung phantom with pulmonary nodules that enabled the accurate measurement of the size of SPNs on various window setting, and proposed the optimal window center (WC) for measurement of the real size on CT. The results were fellows: 1. As CT No. of SPNs increase on a fixed window center and width, an error of size also increase. 2. The measurement of size of SPNs are greatly influenced by window setting. 3. The size of SPNs is decreased, as the window center is increased, 4. It is not correspond with between the measured (WC) or real size and WC which is optimal for viewing. 5. The optimal WC for measurement of real sire is on -500HU and -400HU. 6. CT No. of wall of chest phantom with various amount of fat did not greatly influence size measurement of nodules.