• 한국광학회지
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• 제3권2호
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• pp.77-85
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• 1992

Varied-line spacing concave grating을 이용하여 결상면에서 거의 균일한 분해능을 갖는 평면결상 극자외선 분광기를 설계하엿다. 레이저-프라즈마에서 복사되는 발산광의 집속과 분광기의 수차보정을 위해 toroidal mirror를 사용하였고, 비축광선에 의한 수차를 줄이기 위해 toroidal mirror와 회절격자 사이에 10$\mu \textrm m \times2$mm크기의 입사슬릿을 두었다. 평면결상이 가능한 파장영역은 50~300$\AA$이고, 계산된 분해능은 4000이상이다. 회절격자의 효율과 toroidal mirror에서의 반사율을 고려하면 복사 에너지의 집속도는 toroidal mirror를 사용하지 않았을 때보다 3.5배 증가하고, fluorescence는 파장 100.angs.에서 1000배 이상 증가했다.

• 한국수의병리학회:학술대회논문집
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• 한국수의병리학회 2003년도 추계학술대회초록집
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• pp.41-41
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• 2003

White spot syndrome virus (WSSV) is the causative agent of a disease that has led to severe mortalities of cultured shrimps in Korea and many other countries. Since 1993, massive mortalities due to the viral infection have also occurred in the penaeid shrimps cultured in Korea. WSSV is a large, circular, double stranded (ds) DNA virus and an enveloped, ellipsoid virus with a rod-shaped nucleocapsid with flat ends. In order to identify the characteristics of this Korean isolate of WSSV, the genes for four virion proteins, VP15, VP19, VP28 and VP35 were cloned and their sequences were compared with the available pool of WSSV gene sequences in the GenBank/EMBL databases. From these comparisons, we confirm the occurrence of WSSV in Korea and deduce that, VP15, VP28 and VP35 genes are identically conserved among the Korean isolate and geographically different foreign isolates, but VP19 amino acid sequences of the Korean WSSV isolates changed valine of the foreign isolates into aspartate. (omitted)

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 추계학술대회 논문집
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• pp.432-432
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• 2007

We studied optical simulation method for ultra slim backlight system. We designed 0.7mm thickness light guide plate and combined 48 white color LEDs for 12 inch wide size TFT-LCD. We designed flat shape PMMA light guide plate with both side patterned. It have vertical prism shape on upper side and ellipse dot pattern on the other side. We targeted 4500 nit brightness and uniform emission characteristic without hot spot or dark area. At first, we designed uniform emission area with more high brightness in center area and then, debugged light entering hot spot zone and direction of outgoing light flux. Although it was designing step, we obtained good result with reverse prism optical sheet and it had good repeatability because it was based on the stamper method in injection process without laser engraving or micro groove engraving method.

• 한국수산과학회지
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• 제37권1호
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• pp.44-50
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• 2004

Age and growth of the blue spot mudskipper (Boleophthalmus pectinirostris) were studied using the samples caught in the mud flats of southwestern Korea during April-October, 2001. The value of the marginal index of the second actinost bone was the lowest in July and October and indicated by rings that was analysis of formed teice a year. The relationship between body weigt (BW) and total length (TL) was expressed as BW=0.000005 $TL^{3.12}\;(r^2=0.92)$ for females and BW=0.000476 $TL=^{2.18}\;(r^2=0.62)$ for males. Regression analysis of TL-BW between sexes showed a significant difference (P<0.01). Relationship between total length (TL) and actinost radius (R) were expressed as TL=16.9+33.4 R $(r^2=0.62)$ for females and TL=45.8+26.2 R $(r^2=0.41)$ for males. Growth parameters, $L\infty,t_0$ and K were estimated as 165.2 mm, -0.23, and 1.07 for females and 155.3 mm, -0.35, and 1.39 for males.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2011년도 정기 학술대회
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• pp.570-573
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• 2011

본 논문에서는 배관의 국부변형을 고려하여 각 배관의 특성으로 인하여 발생하게 되는 최대 응력 발생지점에 대한 평가 및 설계기법을 제안한다. 다중관은 일반적으로 배관의 매설 조건이 불안정한 곳이나 배관의 내부 유체의 유출 모니터링 및 난방관 등의 보온을 목적으로 사용되나, 다중관의 거동에 대한 거동 및 설계에 대한 연구는 미비한 실정이다. 본 연구에서 제안한 기법은 탄성범위에서 거동하는 연성관을 대상으로 하며 외관의 형상 및 외부 하중에 의하여 예상되는 국부 변형을 설계 인자로 고려하는 방법이다. 일반적인 원형관의 경우 관의 하단부에서 가장 큰 국부 변형 반경을 나타나며, 국내외에서 사용하고 있는 정사각 콘크리트 보호공의 경우 관의 상측, 하측부($45+90n^{\circ}$)에서 가장 큰 반경을 관찰할 수 있다. 이는 내압이 작용하는 구조물에 대하여 낮은 압력에도 항복에 이르는 환경을 제공하기 때문에 설계 시 반영되어야 할 중요한 요소이다.

• 대한디지털의료영상학회논문지
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• 제15권2호
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• pp.13-18
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• 2013

Purpose : Fluoroscopy equipment, depending on the type of changes that occur in the patient's position ESD and study the patient's scatter ray of ESD Practitioners considered a comparative analysis was to evaluate the correct dose. Materials and Methods : HITACHI four overtube type TU-8000 Flat Detector and Under tube C-Arm Philips' Multi Diagnost Eleva with Flat Detector type were measured by. Each devices is a measure of the patient's esd randophantom position in tabel unfors Xi multi funtion then fixed to the abdomen fluoroscopy and 10 seconds, spot was measured three times, practitioners of the incident surface dose by considering the patient's scatter ray of the table for each device in the average human stomach 21cm thickness acrylic phantom ($25cm{\times}25cm$) Place the practitioner position after position randophantom unfors Xi multi funtion in the thyroid and stomach 1 minute by a fixed one-time fluoroscopy and measured. Results : 10 seconds and the patient perspective of the c-arm ESD 1.2 times smaller on the AP and oblique measurements were measured in the 6-13 times smaller. spot positions to changes in the measured three times on the AP of the abdomen, ESD is 18 times smaller c-arm measurements and the oblique measurement was 19-30 times smaller. And 1 minute at practitioners fluoroscopy esd in the thyroid 2.12 times the c-arm, chest 1.75 times less the dose was measured. On the AP, depending on the device, but the lack of dose difference oblique positions of the two devices depending on changes in the area due to changes in both the AP than on the dose increased, the difference in dose between the two devices, the maximum difference was approximately 27 times. Conclusion : Fluoroscopic equipment at the time of inspection in accordance with changes in dose according to the patient and the patient's positions changes, because the area of the scatter ray considering the change of dose measurements be made, and study of the equipment according to the characteristics of the efficiency and the exposure of the patient and practitioner is considered smooth study equipment manufacturers that can be done is to build the system and think that is also important. Various fluoroscopy when you check future changes in many factors of change in dose for the equipment in the laboratory system by considering the scatter ray radiation shielding for the management to take advantage of reckless undertube have been utilized as more exposure Reduction activities can help is considered as the direction.

• 한국광학회지
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• 제6권3호
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• pp.188-200
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• 1995

파장 13nm의 연 X-선을 사용하여 초고밀도 반도체 칩을 네작할 수 있는 고분해능의 투사 결상용 2-반사경계(배율=1)을 설계하였다. 등배율(1:1)의 광학계는 holosymmetric system으로 구성하였을 때 코마와 왜곡수차가 완전히 제거되는 이점을 갖는다. 2-반사경 holosymmetric system에서 추가적으로 구면수차를 제거하기 위해 두 반사경을 동일한 포물면으로 만들고 두 반사경 사이 거리를 조절하여 비점수차와 Petzval 합이 상쇄되게 함으로써 상면만곡 수차를 보정하였다. 이렇게 구한 aplanat flat-field 포물면 2-반사경 holosymmetric system은 크기가 작고 광축회전대칭의 간단한 구조를 가지면 중앙부 차폐가 아주 작다는 특징을 갖고 있다. 이 반사경계에 대해 잔류 수차, spot diagrams, 회절효과가 고려된 NTF의 분석 등을 통해 연 X-선 리소그라피용 투사 광학계로서의 성능이 조사된 결과, $0.25\mum$및. $0.18\mum$의 해상도가 얻어지는 상의 최대 크기가 각각 4.0mm, 2.5mm로 구해졌고 초점심도는 각각 $2.5.\mu$m, $2.4.\mum$로 얻어졌다. 그러므로 이 반사경계는 256Mega DRAM 및 1Giga DRAM의 반도체 칩 제작의 연구에 응용될 수 있다.

• 한국광학회지
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• 제10권2호
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• pp.107-113
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• 1999

수차가 적은 홀로그래픽 스캐너는 기존의 렌즈나 거울과 같은 광학 소자의 사용 매수를 줄임으로써 제작 가격을 낮출 수 있다는 잠재적인 장점을 갖고 있다. 본 연구에서는 홀로그래픽 스캐너 설계에 광선 추적버블 적용하여 스캔 기능과 초점을 맺는 기능을 동시에 할 수 있는 홀로그래픽 광학 소자를 설계하였으며, 수차가 없는 직선의 스캔 라인을 얻기 위한 기록 및 재생 구조와 hologon 구조에 대해 조사하였다. Prototype으로 제작된 홀로그래픽 스캐너에서 bow는 전체 스캔 폭 300 mm에서 $\pm$133$\mu\textrm{m}$이었으며, spot의 크기는 100 $\mu\textrm{m}$ 이하로 얻을 수 있었다. 실험 결과 광선 추적을 이용한 설계 데이터의 유용성을 검증하였고 레이저 프린터나 디스플레이 분야 등으로의 응용 가능성을 제시하였다.

• 한국조경학회지
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• 제27권1호
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• pp.101-109
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• 1999

The purpose of this study is to analyse types and forms of branch-road in traditional korean villages. To do this, this study has selected and measured 87 branch-road cases of five traditional villages. An analysis of the case study has revealed the following results : 1. Branch-roads have four formations : 3 way, 4 way, multi-way and others. 2. Branch-roads comprise 64 percent of 3 way, 18 percent of 4 way, 8 percent of multi-way and 9 percent of others, respectively. 3. Topographic conditions have mostly affected the formation of branch-roads. 3 way of branch - roads are easily found in flat village. 4 way are multi-way of branch-road are found in semi-hilly and hilly village 4. 3 way of branch-roads have three types: T-type, Y-type, and y-type. 5. T-types are easily found in flat village, but Y-type and y-type are found in semi-hilly and hilly village. 6. Each angle of T-type is 171,99,90, respectively. It has turned out 8 degree is slightly deviated form the square. 7. Y-type of branch-road has an asymmetric form, comprising 145, 128, 87 degree of the angle, compared to 150, 150, 60 degree of symmetric one. 8. Average angles of y-type that are mostly found in hilly village are 175, 113, 72. Angle differences from each spot are 62 and 41 degree. It is assumed that 39 degree is a slope of least effort to walk. 9. 4 way of branch-roads have not only "＋" type but various types of K, Y and Y, Y and y, T and y and a foot of bird. 10. It is assumed that multi-way of branch-roads, mostly found on the middle and bottom of the hilly slope, has naturally formed to connect up and down, left and right.and right.

• 천문학회지
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• 제56권2호
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• pp.293-299
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• 2023

The Wide-Angle Polarimetric Camera (PolCam) is installed on the Korea's lunar orbiter, Danuri, which launched on August 5, 2022. The mission objectives of PolCam are to construct photometric maps at a wavelength of 336 nm and polarization maps at 461 and 748 nm, with a phase angle range of 0°-135° and a spatial resolution of less than 100 m. PolCam is an imager using the push-broom method and has two cameras, Cam 1 and Cam 2, with a viewing angle of 45° to the right and left of the spacecraft's direction of orbit. We conducted performance tests in a laboratory setting before installing PolCam's flight model on the spacecraft. We analyzed the CCD's dark current, flat-field frame, spot size, and light flux. The dark current was obtained during thermal / vacuum test with various temperatures and the flat-field frame data was also obtained with an integrating sphere and tungsten light bulb. We describe the calibration method and results in this study.