Ultra-Low-Dose Chest CT in Patients with Neutropenic Fever and Hematologic Malignancy: Image Quality and Its Diagnostic Performance

김해진,박소영,이호연,이경수,신경은,문정원 대한암학회 2014 Cancer Research and Treatment Vol.46 No.4

PurposeThe aim of this study was to evaluate the image quality of ultra-low-dose computedtomography (ULDCT) and its diagnostic performance in making a specific diagnosis ofpneumonia in febrile neutropenic patients with hematological malignancy. Materials and MethodsULDCT was performed prospectively in 207 febrile neutropenic patients with hematologicalmalignancy. Three observers independently recorded the presence of lung parenchymalabnormality, and also indicated the cause of the lung parenchymal abnormality betweeninfectious and noninfectious causes. If infectious pneumonia was considered the cause oflung abnormalities, they noted the two most appropriate diagnoses among four infectiousconditions, including fungal, bacterial, viral, and Pneumocystis pneumonia. Sensitivity forcorrect diagnoses and receiver operating characteristic (ROC) curve analysis for evaluationof diagnostic accuracy were calculated. Interobserver agreements were determined usingintraclass correlation coefficient. ResultsOf 207 patients, 139 (67%) had pneumonia, 12 had noninfectious lung disease, and 56had no remarkable chest computed tomography (CT) (20 with extrathoracic fever focus and36 with no specific disease). Mean radiation expose dose of ULDCT was 0.60±0.15 mSv. Each observer regarded low-dose CT scans as unacceptable in only four (1.9%), one (0.5%),and three (1.5%) cases of ULDCTs. Sensitivity and area under the ROC curve inmaking a specific pneumonia diagnosis were 63.0%, 0.65 for reader 1; 63.0%, 0.61 forreader 2; and 65.0%, 0.62 for reader 3; respectively. ConclusionULDCT, with a sub-mSv radiation dose and acceptable image quality, provides ready andreasonably acceptable diagnostic information for pulmonary infection in febrile neutropenicpatients with hematologic malignancy.

효율적인 LSF 양자화기를 이용한 QCELP 성능개선

김해진,강상원,Kim, Hae-Jin,Kang, Sang-Won 한국음향학회 1997 韓國音響學會誌 Vol.16 No.1

In this paper, an efficient LSF quantizer, named improved PSVQ(IPSVQ), is proposed to apply in the 8 kbps QCELP speech coder. By using 27 bits IPSVQ instead of 40 bits DPCM quantizer per frame, we can save 13 bits/frame and allocate those bits to the codebook gain and the pitch gain parameters. Hence we improve the overall performance of the QCELP codec. The enhanced QCELP shows the performance improvement of 0.9 dB SNR and 0.4 dB SEGSNR. Informal listening tests also confirm the improvement in the speech quality. 본 논문에서는 LSF계수의 효율적인 양자화기인 improved PSVQ(IPSVQ) 방식을 제안하고, 이를 CDMA 디지틀 이동통신용 음성부호화기인 8 kbps QCELP에 도입하여 QCELP의 성능을 개선하였다. 프레임당 40 비트의 DPCM 양자화방식 대신 27 비트에서 transparent한 성능을 제공하는 IPSVQ 방식을 이용하여 13 비트를 절약하고, 이렇게 절약된 비트들을 음질에 중요한 영향을 끼치는 계수들에 해당하는 코드북 및 피치이득 계수의 양자화에 추가로 할당하여 QCELP의 전체적인 성능을 개선하였다. 객관적인 평가 방법인 SNR 및 SEGSNR이 각각 0.9 dB와 0.4 dB 정도 개선되었으며, 주관적인 음질시험을 통해서 성능향상을 확인할 수 있었다.

위치 기반 초·중·고 학교 정보 매쉬업 서비스

김해진,김해란,한순희,조혁현,정희택,Kim, Hae-Jin,Kim, Hae-Ran,Han, Soon-Hee,Cho, Hyug-Hyun,Ceong, Hee-Taek 한국전자통신학회 2010 한국전자통신학회 논문지 Vol.5 No.6

16개 시 도 교육청의 누리집의 학교 정보 서비스는 대부분 정적인 지도 이미지에서 지역을 클릭 했을 때 해당 지역의 학교 정보를 제시하거나 검색에 의한 텍스트 위주의 결과 정보를 나열한다. 그리고 동기적 전송에 의한 검색으로 서버 부하 및 느린 전송 속도 등 여러 문제점을 내포하고 있다. 이에 본 연구에서는 위치기반의 학교 정보를 제공하기 위해 구글 지도의 Open API를 이용하고 검색 시 서버 부하 감소 및 전송 속도 향상을 위해 비동기적 전송 방식의 Ajax 프로그램을 이용하여 학교 정보 매쉬업 서비스를 구현 하였다. 이 서비스는 학생, 교사, 학부모 등 다양한 계층의 교육 가족에게 동적 지도상에 위치기반의 학교 정보를 서비스함으로써 효율성과 편리함을 줄 수 있다. In the homepage of 16 municipal provincial office of education, school information service displays text-based results through search step or presents the simple information of the selected area when an area is clicked on the static image map. And it has several problems such as server load and slow transfer speed by the search of the synchronous transfer. Thus, in this study, we used the open API of Google map to provide location-based school information and implemented the mash up service for school information with the Ajax program of asynchronous transfer to reduce server load and to increase transmission speed. This service gives the efficiency and convenience to students, teachers, parents and education family members of various levels because it includes the location with school information on a dynamic map.

간정맥의 초음파 소견

김해진 대한영상의학회 1987 대한영상의학회지 Vol.23 No.1

Understanding of the anatomy of the hepatic vein is important in manipulation for transplantation of the liver, hepatectomy and the treatment of hepatic trauma with avulsion of the hepatic vein. Demonstration of the inferior right hepatic vein is also important; in some cases of hepatocellular carcinoma, . thrombus can be seen in the IRHV; in primary Budd-Chiari syndrome, the IRHV is the main draining vein; during hepatectomy, the postero-inferior segment of the right lobe and draining IRHV can be preserved. For some 10 months ultrasound examination was done in a total of 124 patients with normal liver functon with special emphasis on the hepatic veins, their branches, and the IRHV, and analysed in terms of branching pattern and relative size of the hepatic vein and the detection rated of the IRHV.

경남지역 치과의원 의료폐기물 관리실태

김해진,사공준,Kim, Hae-Jin,SaKong, Joon 한국환경보건학회 2012 한국환경보건학회지 Vol.38 No.4

Objectives: The purpose of this study was to prevent health problems and environmental contamination resulting from inappropriate management of dental wastes and to provide reference data for revision and supplementation of dental clinic waste management guidelines. Methods: From 640 total of dental clinics registered in 16 cities and counties in Gyeongsangnam-do, 100 (60 in Changwon (Masan, Changwon), 29 in Gimhae, and 11 in Jinju) were included in this study. From July 2010 to September 2010, investigators visited the 100 dental clinics and conducted survey interviews using a structured survey questionnaire regarding disposal methods for liquid wastes (suction pump, spittoon container waste, used liquid disinfectants, and X-ray developer), and disposal methods for solid waste (suction pump, spittoon container waste, and general medical waste). Results: All the 100 dental clinics were found to treat liquid waste from suction pumps and spittoon containers in the same manner as general waste water. Nineteen percent of the clinics treated solid waste that was not filtered through the filter of a suction pump as general waste. Fifty or more percent of the clinics treated solid waste in spittoon containers as general waste. Seventy percent of the clinics used disinfectant solution, although most of them treated used disinfectants in the same manner as general waste water. Some clinics treated used X-ray developer and X-ray fixer in the same manner as general waste water. In most of the clinics, used drapes were washed within the clinic. Conclusions: It was found that waste water and dental wastes at some dental clinics were treated in inappropriately. Thus, in conclusion, the development of guidelines regarding proper management of liquid and solid dental waste at dental clinics is required, and hygiene and environmental training for workers at dental clinics is necessary.

타액선 질환이 건조 타액선 조영술 소견

김해진 대한영상의학회 1987 대한영상의학회지 Vol.23 No.2

Clinicians have been dependant mainly on the radiologic findings in the diagnosis of the disease of salivary gland, because of difficulty in diagnosis of differentiation of the disease by clinical findings alone and paucity of laboratory method for diagnosis of salivary gland disease. RESULT : 1. The most common lesion is benign mixed tumor, which is cooupied over 2/3 of total. 2. Patients' clinical symptom and signs are pain, tenderness, swelling and palpable mass on the salivary gland area, but there is no specific findings to identify each salivary gland lesions by climical symptom. 3. Differential diagnosisof benign and malignant tumor is easy by xerosiglographic findings. 4. Xerosialogram is more accurated than conventional film sialography and possible to identify sall structures of salivary gland with good detail on one iage and also more easily interpreted without special means of viewing.

대기압/진공 조건의 트라이보 시험기를 이용한 박막 코팅의 마찰/마모 특성 비교

김해진,김대은,김창래 한국트라이볼로지학회 2019 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.35 No.6

In various industries, thin film coatings are used to improve friction and wear characteristics. Various types of tribotesters are used to evaluate the friction and wear characteristics of such thin film coatings. In this study, we fabricated a micro-tribotester and Tribo-scanning electron microscopy (SEM) to compare the friction and wear characteristics of copper (Cu) coatings under an atmospheric pressure and a vacuum condition, respectively. The reliability of the different types of tribotesters was evaluated by performing calibrations for the sensor to measure the friction forces and normal loads. Using the two different types of devices, the friction and wear tests are conducted at the same experimental conditions excluding environment conditions such as the atmospheric pressure and vacuum condition. The friction coefficient at the vacuum condition is lower than at the atmospheric pressure. This difference in friction characteristics is due to the fact that wear phenomena occur differently according to the atmospheric pressure and vacuum condition. At the atmospheric pressure, the abrasive wear is the main wear mechanism. At the vacuum condition, the adhesive wear is the main wear mechanism. The reason for the difference in the wear mechanism of the Cu coating at the atmospheric pressure and the vacuum condition is that the oxidation phenomenon, which does not appear at the vacuum condition, occurs at the atmospheric pressure; therefore, the characteristics of the Cu coating change accordingly.

Novel Soft Starting Algorithm of Single Phase Induction Motors by Using PWM Inverter

김해진,황선환,김장목 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.6

This paper proposes a novel soft starting algorithm by using PWM inverter technique to control an amplitude of the motor starting current at a single-phase induction motor (SPIM). Traditional SPIM starting methods such as a Split-Phase, Capacitor-Start, Permanent-Split Capacitor (PSC), Capacitor-Start Capacitor-Run (CSCR), basically cannot control the magnitude of starting current due to the fixed system structures. Therefore, in this paper, a soft starting algorithm based on a proportional resonant (PR) control with a variable and constant frequency is proposed to reduce the inrush current and starting up time. In addition, a transition algorithm for operation modes is devised to generate a constant voltage and constant frequency (CVCF). The validity and effectiveness of the proposed soft starting method and transition algorithm are verified through experimental results.

산란계에 갯벌 미생물 유래 단백질 분해 효소제의 급여가 계란 품질, 영양소 소화율 및 혈청내 총 단백질 함량에 미치는 영향

김해진,조진호,진영걸,유종상,민병준,박병철,김인호,Kim, H.J.,Cho, J.H.,Chen, Y.J.,Yoo, J.S.,Min, B.J.,Park, B.C.,Kim, I.H. 한국가금학회 2006 韓國家禽學會誌 Vol.33 No.4

본 연구는 산란계 사료내 갯벌 미생물 유래 단백질 분해 효소제를 첨가하였을 때 계란 품질, 영양소 소화율 및 혈청 내 총 단백질 함량에 미치는 영향을 알아보기 위해 실시하였다. 사양 시험은 29주령 ISA brown 갈색계 252수를 공시하며 8주간 실시하였다. 처리구는 옥수수-대두박 위주의 사료인 기초 사료구(CON; basal diet), 기초 사료내 단백질 분해 효소제 0.05% 첨가구(PROI; basal diet+0.05% pretense), 0.1% 첨가구 (PRO2; basal diet+0.1% protease)로서 처리구당 7반복, 반복당 12수씩 완전임의 배치하였다. 전체 사양시험 기간 동안, 산란율은 처리구간에 유의적인 차이를 보이지 않았다(P>0.05). 난황고의 변화량은 PRO1 처리구가 CON 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 난중의 변화량은 PRO2처리구가 CON과 PRO1 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 난각 품질, 난황색, haugh unit 및 난황 계수에서는 처리구간에 유의적인 차이를 보이지 않았다(P>0.05). 건물 소화율에서는 CON과 PRO2처리구가 PRO1 처리구와 비교하여 유의적으로 높게 나타났고(P<0.05), 질소 소화율에서는 PRO2 처리구가 CON 처리구와 비교하여 유의적으로 높게 나타났다(P<0.05). 혈청내 총 단백질 함량에서는 처리구간에 유의적인 차이를 보이지 않았다(P>0.05). 결론적으로, 산란계 사료내 갯벌 미생물 유래 단백질 분해 효소제의 첨가는 난황고, 난중 및 영양소 소화율을 개선시켰다. This study was conducted to investigate the effects of mud flat bacteria origin pretense supplementation on e99 qualify, nutrient digestibility and total protein concentration of serum in laying hens. A total of two hundred fifty two laying hens were randomly allocated into three treatments with seven replications for eight weeks. Dietary treatments included 1) CON (basal diet), 2) PRO1 (basal diet + 0.05% pretense) and 3) PRO2 (basal diet + 0.1% pretense). During the entire experimental peripd, hen-day egg production was not affected by treatments (P>0.05). Difference of yolk height was increased in PRO1 treatment compared with CON treatment (P<0.05). Difference of egg weight was increased in PRO2 treatment compared with CON and PRO1 treatments (P<0.05). Shell quality, yolk color unit, haugh unit and egg yolk index were not affected by treatments (P>0.05). DM digestibility was improved in CON and PRO2 treatments compared with PRO1 treatment (P<0.05). N digestibility was improved in PRO2 treatment compared with CON treatment (P<0.05). Total protein concentration in serum were not affected by treatments (P>0.05). In conclusion, mud flat bacteria origin pretense was effective for improving egg weight, yolk height and nutrient digestibility in laying hens.

초등학생의 곤충에 대한 인식과 태도 조사 연구

김해진,배진호,심규철,소금현 韓國生物敎育學會 2013 생물교육 Vol.41 No.1

This study aims to look into the understanding and attitude toward insects in elementary school students. On the subject of elementary students (1st to 6th graders), degree of identifying the insect typically recognized and their attitude towards insects were investigated to compare comparatively by grade and sex. First, elementary school students understood a butterfly (27%), stag beetle (19%) and ant (17%) as typical insects, and referred to a tree (29%) and flower (20%) as habitat. Most students thought of behavior related to food (47%) with similar pattern by sex. Second, there was a clear tendency that students recognized familiar insects in their curriculum of science quite right. Third, elementary school students showed positive attitudes as to scientific (3.41), ecological (3.72) and negative aspect (2.91) but some negative attitude as to natural aspect (2.84). By school year, there was significant difference shown in scientific, negative and natural aspect. In comparison by sex, male students' attitude in scientific, negative and natural aspects were found to be positive.