가시광에서 하이브리드 렌즈를 사용한 반사굴절식 전방위 줌 광학계의 설계 및 성능평가

박현식,조재흥,Park, Hyun Sik,Jo, Jae Heung 한국광학회 2020 한국광학회지 Vol.31 No.2

주간 무인 감시를 위하여 가시광 파장 범위인 400~700 nm에서 렌즈와 거울의 기능을 동시에 갖는 구멍 없는 하이브리드 렌즈를 활용한 반사굴절식 전방위 줌 광학계를 설계하고 그 성능을 분석하였다. 하이브리드 렌즈는 렌즈에 구멍을 뚫는 작업이 없고 광학 부품의 수량을 줄일 수 있기 때문에 전방위 줌 광학계의 제작과 조립에서 많은 장점을 갖는다. 이 광학계에서 결상된 도넛 형태의 상에서 안쪽의 압축된 낮은 공간주파수의 상 영역을 확대하여 보기 위해서 줌 렌즈의 기능을 추가한 전방위 광학계의 최적화 설계를 진행하였다. 그 결과 최적화 설계된 광학계의 변조전달함수, 스폿 다이어그램 분석, 공차 분석을 통해 이 광학계의 성능을 분석한 결과로부터 설계 목표 사양을 만족함을 알 수 있었다. 줌 광학계를 주밍할 때 -30~50℃의 온도 변화에 따른 비열화 해석을 한 결과, 적절한 렌즈의 재질을 선정하여 온도 변화에도 상 거리 변화가 거의 없는 광학계임을 확인하였다. A catadioptric omnidirectional zoom optical system using a hybrid lens (COZOSH) that performs simultaneously two functions of a lens and a mirror was designed at the visible wavelength range for daytime unmanned surveillance, and its performance was analyzed. The hybrid lens has lots of advantages in terms of fabrication and assembly of a COZOSH, because of the obviation of a lens boring process and reduction of the number of optical components. Additionally, we designed the COZOSH to expand the compressed inner-image region of a donut image at low spatial frequencies. As a result, the optimized design performance of the optical system that satisfies all initial design specifications was obtained from calculation of the modulation transfer function, spot diagram, and tolerance analysis. We confirmed that the COZOSH is a passively athermalized optical system under conditions of temperature variation from -30℃ to 50℃, by using athermalization analysis during zooming.

현장 조사를 통한 가축전염병 대응 정책개선 방안 연구

박현식,함승희,이준,Park, Hyun Shik,Ham, Seung Hee,Lee, Jun 한국재난정보학회 2021 한국재난정보학회 논문집 Vol.17 No.2

Purpose: The purpose of this study is to analyze the characteristics of animal carcasses treatment and quarantine management of infectious diseases of livestock, and to present the effectiveness of quarantine and follow-up management of livestock infectious diseases. Method: Actually, a livestock epidemic occurred and the burial site and burial management facility that treated livestock carcasses were visited on-site to analyze the management status and problems. Result: The burial method of livestock outbreaks of livestock infectious diseases and the long-term follow-up management accordingly requires a large amount of manpower and budget to be spent. For example, it can be seen that it is an inefficient quarantine system. Conclusion: It is necessary to review plans for the establishment of integrated livestock infectious animal carcasses treatment facilities at the level of metropolitan cities, districts, and municipalities with the government, where there is no fear of secondary infectious disease transmission and no follow-up management is required. 연구목적: 본 연구는 가축전염병 가축사체처리 및 방역관리에 대한 특성을 분석하고, 가축전염병 방역과 사후 관리의 실효성을 제시하는 것을 목적으로 한다. 연구방법: 실제로 가축전염병이 발생하여 가축 사체를 처리한 매몰지 및 매몰 관리시설을 현장 방문하여 관리현황과 문제점을 분석하였다. 연구결과: 가축전염병 발생 가축의 매몰방식과 그에 따른 장기적인 후속 관리는 많은 인력과 예산을 투입하게 만들어 비효율적인 방역시스템임을 알 수 있었다. 결론: 2차적인 감염병 전파우려가 없고 후속 관리가 필요 없는 정부와 광역 시도 및 시군구 차원의 통합 가축전염병동물 사체처리 시설 설립 방안의 검토가 필요하다.

지역사회에서 청소년지도자 양성방안을 위한 전제 조건

박현식,Park, Hyeon-Sik 충남발전연구원 2006 열린충남 Vol.33 No.-

물류센터의 소방시설과 방재대책

박현식,Park, Hyeon-Sik 한국화재보험협회 2003 防災와 保險 Vol.96 No.-

조기 임신 진단의 필요성과 임신진단 포인트

박현식,Park, Hyeon-Sik 대한양돈협회 1998 養豚 Vol.20 No.4

고력황동의 Hard Spots 형성에 미치는 첨가원소의 영향

박현식,나형용 ( Hyun Sik Park,Hyung Yong Ra ) 한국주조공학회 1986 한국주조공학회지 Vol.6 No.1

This study was undertaken to understand the formation mechanism of the hard spots in high strength brass. To investigate the behavior of the hard spots in the isothermal liquid state with varying silicon content, the rapidly quenched specimens were obtained by suctioning the melt into the silica tube and water quenching. To examine the growth process of the hard spots with holding time, the unidirectional solidification technique was used. The results of this study are summarized as follows: 1) With the addition of Fe in order to get the effects of grain refinement in high strength brass, the two different type of Fe-rich phases are occurred, which are defined as dendritic and globular phase. The chemical composition of the globular phase was different from that of the dendritic phase in that the globular phase contained Si. 2) With increasing Si content, the Fe-rich phase had a tendency to form globular phase. 3) As the holding time increased in the liquid state, globular was also prone to coalesce. The further growth of globular phase to large size was due to reducing the interfacial energy. 4) The primary phase of copper alloy was nucleated preferentially on the dendritic phase. It was noticeable that the dendritic phase acted as a grain refiner. However, the agglomerate (hard spots) which was composed of the globular phase decreased the mechanical properties of high strength brass. 5) Once the hard spots formed in the high strength brass casting, it was very difficult to remove them. This is due to the fact that their meting temperature is higher than the pouring temperature of high strength brass.

비 카세트 방식과 카세트 방식을 이용한 [⁶⁸Ga]PSMA-11의 자동 합성 방법 비교

박현식,조병민,안현호,이홍진,이진형,이경재,이병철,이원우,Hyun-Sik, Park,Byeong-Min, Jo,Hyun-Ho, An,Hong-Jin, Lee,Jin-Hyeong, Lee,Gyeong-Jae, Lee,Byung-Chul, Lee,Won-Woo, Lee 대한핵의학기술학회 2022 핵의학 기술 Vol.26 No.2

Purpose [⁶⁸Ga]PSMA-11 is needed the high reproducibility, excellent radiochemical yield and purity. In term of radiation safety, the radiation exposure of operator for its production also should be considered. In this work, we performed a comparative study for the fully automated synthesis of [⁶⁸Ga]PSMA-11 between non-cassette type and cassette type. Materials and Methods Two different type of modules (TRACERlab FX N pro for non-cassette type and BIKBox for cassette type) were used for the automated production of [⁶⁸Ga]PSMA-11. According to the previously identified elution profile, Only 2.5 ml with high radioactivity was used for the reaction. After adjusting the pH of the reaction solution with HEPES buffer solution, the precursor was added and reacted with at 95 ℃ for 15 minutes. The reaction mixture was separated and purified using a C18 light cartridge. The product was eluted with 50% EtOH/saline solution and diluted with saline. It was completed by sterilizing filter. In the non-cassette type, the aforementioned process must be prepared directly. However, in the cassette method, synthesis was possible simply by installing a kit that was already completed. Results Both total [⁶⁸Ga]PSMA-11 production time were 25±3(non-cassette type) and 23±3 minutes(cassette type). The radiochemical yield of the non-cassette type(65.5±5.7%) was higher than that of the cassette type(61.6±4.8%) after sterilization filter. The non-cassette type took about 120 minutes of preparation time before synthesis due to washing of synthesizer and reagent preparation. However, since the cassette type does not require washing and reagent preparation, it took about 20 minutes to prepare before synthesis. Both type of synthesizer had a radiochemical high purity(>99%). Conclusion The non-cassette type production of [⁶⁸Ga]PSMA-11 showed higher radiochemical yield and lower cost than the cassette type. However, The cassette type has an advantage in terms of preparation time, convenience, and equipment maintenance.

박막저항기 특성에 미치는 제조 공정 인자의 영향

박현식,유윤섭,Park Hyun-Sik,Yu Yun-Seop 한국마이크로전자및패키징학회 2005 마이크로전자 및 패키징학회지 Vol.12 No.1

저항 값을 맞추기 위한 트리밍 공정이 낮은 저항온도계수와 높은 정밀성을 요구하는 박막저항기 특성에 미치는 영향에 대한 연구가 수행되었다. 스퍼터링 방법으로 제조된 박막 저항기의 트리밍 속도에 따른 저항기의 특성 변화와 온도계수의 변화가 관찰되었다. 트리밍 속도의 증가에 따라서 박막 저항기 특성은 저하되었으며, 열처리로 저항 값의 평균 편차 $0.26\%$ 및 저항온도계수 52.77(ppm/K)의 개선효과가 있었다. 1k$\Omega$와 10k$\Omega$저항기가 100k$\Omega$ 박막저항기 보다는 특성이 양호하였으며, 트리밍 속도의 치적 조건으로는 20mm/sec와 특성 개선을 할 수 있는 최적 열처리 온도는 593K였으며 최적 조건에서 제작된 저항기의 저항 값의 평균 편차는 $0.31\%$ 및 저항온도계수 10(ppm/K)미만이었다. The effect of trimming process to adjust accurate resistance of a thin-film resistor was studied with respect to low temperature coefficient of resistance(TCR) and high precision. The characteristics of a thin-film resistor fabricated by sputtering were investigated depending on trimming condition and annealing temperature. Measured results showed that the characteristic of a thin-film resistor was degraded with increased trimming speed. However, an average resistance deviation and a TCR were improved to $0.26\%$ and 52.77[ppm/K], respectively, through annealing treatment. Also, thin-film resistors with 1 k$\Omega$ and 10k$\Omega$ showed better performance compared to a resistor with 100k$\Omega$. The Optimal trimming speed and annealing temperature were 20mm/sec and 539K, respectively, and under this optimal condition, a thin-film resistor with an average resistance deviation of $0.31\%$ and a TCR of below 10[ppm/K] was obtained.

SMART-ITL 시험시설을 이용한 SMART 설계에서의 노심냉각 거동 및 안전주입 특성 고찰

박현식(Hyun-Sik Park),배황(Hwang Bae),류성욱(Sung-Uk Ryu),양진화(Jin-Hwa Yang),전병국(Byong-Guk Jeon),방윤곤(Yoon-Gon Bang),이성재(Sung-Jae Yi) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11

조손가정을 위한 사회적, 선교적 실천에 관한 연구

박현식(Park, Hyun Sik),전석재(Jeon, Seok Jae) 한국선교신학회 2011 선교신학 Vol.26 No.-

This study deals with missional practice of local church for the grandfather and grandson family. This article focuses on carrying the missional alternatives to the grandfather and grandson home in the Korea context. The grandfather and grandson home has so many difficulties about health, economic, social, and spiritual relationship. Because their problems brought out home collapse, divorce, and aging society. This article explains some opinions the task of social institutions, governments, and local churches. They should be need counseling, care, financial support, study support, and programs from local churches and social welfare institutions. I want to suggests several kinds about missional practice for the grandfather and grandson family. First, local church and pastor should be change paradigms about social service mission. The church mission could be act for the grandfather and grandson family. Second, the missional practices are making network among social welfare group, local church, Christianity NGO, and government. Third, local churches support program development and service improvement for them.