• Title/Summary/Keyword: 첩

Search Result 161, Processing Time 0.037 seconds

Estimation of Growth Parameters of Corbicula (Corhiculina) papyracea Heude from Chungpyeong (청평 내수면에 서식하는 엷은재첩, Corbicula (Corbiculina) papyracea Heude의 성장모수 추정)

  • Kwon Dae Hyeon;Kang Yong Joo;Kim Dae Hee
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.35 no.6
    • /
    • pp.557-562
    • /
    • 2002
  • This study was to estimate population growth parameters of the freshwater bivalve, Corbicula (Corbiculina) papyacca (Heude) in Korea. Samples were collected from Jojong stream in Chungpyeong from September 1999 to August 2000. Ages were determined from the ring of shell, The shell length of the samples ranged from 4,2 mm to 28.1 mm, The ring on the surface of shell was formed once a year from January to March, Marginal increment analysis of shell rings indicated that annuli were formed in June. Spawning period was estimated to be May to August with a peak between June and July through fatness analysis, and thus rings were considered to be true annual marks. Von Bertalanffy's growth parameter were estimated from a nonlinear method with the value of logical maximum shell length ($L_{propto}$) was 34,36 mm, K was 0.1531/year, logical age of shell length 0 ($t_{0}$) was -0,5246 year, and logical maximum total weight ($W_{propto}$) was 11.42 g.

Time-Frequency Domain Reflectometry based on Real-Time Spectrum Estimation for Detection and Localization of a Fault on a Coaxial Cable (실시간 스펙트럼 추정기에 기반한 시간-주파수 영역에서의 동축케이블 결함 검출 기법)

  • Doo, Seung-Ho;Ra, Won-Sang;Kwak, Ki-Seok;Yoon, Tae-Sung;Park, Jin-Bae
    • Proceedings of the KIEE Conference
    • /
    • 2007.07a
    • /
    • pp.300-301
    • /
    • 2007
  • 본 논문에서는 실시간 스펙트럼 추정기에 기반하여 시간-주파수 영역 반사파 계측 시스템에서의 동축케이블 결함을 검출하는 방법을 제안한다. 시간-주파수 영역 반사파 계측 시스템은 가우시안 포락선(Gaussian Envelop)모양의 첩 신호를 기준신호로 하여 도선에 반사파를 분석하는 기법으로써 타 방법에 비하여 높은 정확도를 자랑하는 것으로 알려져 있다. 하지만 결함 위치를 추정하기 위해 Wigner 시간 주파수 분포 함수를 이용하므로 계산량 증가에 따른 실시간 구현이 어렵다는 단점이 있었다. 이러한 단점을 극복하기 위하여 본 논문에서는 LMS 스펙트럼 추정기를 이용한 시간-주파수 영역 반사파 계측 시스템의 구현방법을 새롭게 제안한다. 제안된 기법은 실제 동축케이블에 대한 실험결과를 통하여 그 성능을 입증하도록 한다.

  • PDF

A Case of Recurrent Transient Small Bowel Intussusception (반복적으로 발생한 일과성 소장형 장중첩증 1예)

  • Mun, Yun-Hee;Yun, Min-Jung;Kim, Su-Youn;Rha, Yeong-Ho
    • Pediatric Gastroenterology, Hepatology & Nutrition
    • /
    • v.9 no.1
    • /
    • pp.70-74
    • /
    • 2006
  • Isolated small bowel intussusception accounts for 10% of all pediatric intussusception. It is more common in children older than 2 years of age. Presentation usually is with vomiting and abdominal pain. Currant jelly stool and palpable mass are less frequent than typical intussusception. There are few reported cases of children with transient small bowel intussusception. We describe 3-year-old boy presented with intermittent cyclic crampy abdominal pain for 6 months was diagnosed as having recurrent transient small bowel intussusception by abdominal ultrasonography and small bowel series.

  • PDF

Squint-less Phased Array Antenna Near-field Subwavelength Focusing with True-time Optical Delay Line (광 지연선로를 이용한 스퀸팅이 없는 위상배열 안테나의 근접장 서브파장 포커싱)

  • Jung, Young Jin
    • Korean Journal of Optics and Photonics
    • /
    • v.30 no.3
    • /
    • pp.94-100
    • /
    • 2019
  • The near-field subwavelength squint-less focusing system of a phased array antenna is designed and demonstrated by numerical simulation. The Huygens-Fresnel principle is applied to numerical simulation for calculation of the phased array antenna at microwave frequency. It was shown that beam squinting can be eliminated, utilizing true-time optical delay lines based on a chirped fiber grating in the proposed system. Furthermore, subwavelength focusing with high numerical aperture can be achieved by considering the fact that the array elements of the phased-array antenna can be treated as diffractive elements in an optical lens system. Also, side lobes can be suppressed by decreasing the distance between element antennas to less than half of the wavelength.

The significance of diagnosis and treatment planning in periapical lesion overfilled with calcium hydroxide paste (수산화칼슘제재의 과충전이 발생한 치근단 병소 증례에서 진단과 치료 계획의 중요성)

  • Jung, Kyoung-Hwa;Kwon, Eun-Young;Choi, Youn-Kyung;Kim, So-Yeun;Jeon, Hye-Mi;Park, Jeong-Kil
    • Journal of Dental Rehabilitation and Applied Science
    • /
    • v.37 no.2
    • /
    • pp.95-100
    • /
    • 2021
  • Calcium hydroxide has been widely used for root canal dressing material in endodontic treatment. This report describes that when the accurate diagnosis and proper nonsurgical endodontic retreatment is applied to periapical lesion with accidentally extruded calcium hydroxide paste, the lesion can be successfully treated. Overfilled calcium hydroxide can affect the healing process, so the overextension of calcium hydroxide agent should be avoided.

A Design Method for Pre-Distortion Compensation of SAR Chirp Signal based on Envelop Sampling and Interpolation Filter (위성 탑재 영상레이다 첩 신호의 전치왜곡 보상을 위한 포락선 샘플링 및 보간 필터 기반의 설계 기법)

  • Lee, Young-Bok
    • Journal of the Korea Institute of Military Science and Technology
    • /
    • v.25 no.4
    • /
    • pp.347-354
    • /
    • 2022
  • The synthetic aperture radar(SAR) is an equipment that can acquire images in all weathers day and night based on radar signals. The on-board processor of satellite SAR generates transmission signal by digital signal processing, converts it into an analog signal and transmits to antenna. Until the transmission signal generated by on-board processor is output, the signal passes the transmission cables and analog devices. At this time, these hardware distort the signal and makes SAR performance worse. To improve the performance, pre-distortion technique is used. But, general pre-distortion using taylor series is not sufficient to compensate for the distortion. This paper suggests transmit signal design method with improved pre-distortion. This paper uses envelop sampling method and interpolation filter for frequency domain compensation. The proposed method accurately compensates the hardware distortion and reduces resource usage of FPGA. To analyze proposed method's performance, IRF characteristics are compared when the proposed method applies to signal with errors.

Studies on the Assumption of the Locations and Formational Characteristics in Yigye-gugok, Mt. Bukhansan (북한산 이계구곡(耳溪九曲)의 위치비정과 집경(集景) 특성)

  • Jung, Woo-Jin;Rho, Jae-Hyun;Lee, Hee-Young
    • Journal of the Korean Institute of Traditional Landscape Architecture
    • /
    • v.35 no.3
    • /
    • pp.41-66
    • /
    • 2017
  • The purpose of this research is to empirically trace the junctures of Yigye-gugok managed by Gwan-am Hong Gyeong-mo, a grandson of Yigye Hong Yang-ho who originally designed Yigye-gugok, while reviewing the features of the forms and patterns of gugok. The results of the research are as follows. 1. Ui-dong was part of the domain of the capital during the Chosun dynasty, which also is located in the city of Seoul as a matter of administrative zone. Likewisely, Yigye-gugok is taken as a special meaning for it was one and only gugok. Starting with Mangyeong Waterfall as the $1^{st}$ gok, Yigye follows through the $2^{nd}$ gok of Jeokchwibyeong Rock, the $3^{rd}$ gok of Chanunbong Peak, the $4^{th}$ gok of Jinuigang Rock, the $5^{th}$ gok of Okkyeongdae Rock, the $6^{th}$ gok of Wolyeongdam Pond, the $7^{th}$ gok of Tagyeongam Rock, the $8^{th}$ gok of Myeongoktan Stream, and the $9^{th}$ gok of Jaeganjeong Pavilion. Of these, Mangyeong Waterfall, Chanunbong Peak, and Okkyeongdae Rock are distinct for their locations in as much as their features, while estimated locations for Jinuigang Rock, Wolyeongdam Pond, Myeongoktan Stream, and Jaeganjeong Pavilion were discovered. However, Jeokchwibyeong Rock and Tagyeongam Rock demonstrated multiple locations in close resemblance to documentary literatures within secretive proximity, whereas geography, scenery, and sighted objects were considered to evaluate the 1st estimated location. Through these endeavored, it was possible to identify the shipping routes and structures for the total distance of 2.1km running from the $1^{st}$ gok to the $9^{th}$ gok, which nears Gwanam's description of 5ri(里), or approximately 1.96km for gugok. 2. Set towards the end of the $18^{th}$ century, Yigye-gugok originated from a series of work shaping the space of Hong Yang-ho's tomb into a space for the family. Comparing Yigye-gugok to other gugoks, numerous differences are apparent from beyond the rather more general format such as adjoining the $8^{th}$ gok while paving through the lower directions from the upper directions of the water. This gives rises to the interpretation such that Yigye-gugok was positioned to separate the doman of the family from those of the other families in power, thereby taking over Ui-dong. Yet, the aspect of the possession of the space lends itself to the determination that the location positioned at the $8^{th}$ gok above Mangyeongpok Waterfall representing Wooyi-dong was a consequence of the centrifugal space creation efforts. 3. While writings and poetic works were manufactured in such large quantities in Yigye-gugok whose products of setters and managers seemed intended towards gugok-do and letters carved on the rocks among others, there is yet a tremendous lack of visual media in the same respect. 'Yigye-gugok Daejacheop' Specimens of Handwriting offers the traces of Gwanam's attempts to engrave gakja at the food of Yigye-gugok. This research was able to ascertain that 'Yigye-gugok Daejacheop' Specimens of Handwriting was a product of Hong Yang-ho's collections maintained under the auspices of the National Central Museum, which are renowned for Song Shi-yeol's penmanship.

The Types and Transition of Kasaya since the Mid Joseon Dynasty (조선중기 이후 가사(袈裟)의 유형과 변천)

  • Kang, Sun Jung;Cho, Woo Hyun
    • Journal of the Korean Society of Costume
    • /
    • v.64 no.2
    • /
    • pp.17-34
    • /
    • 2014
  • This is a theoretical and empirical study on Kasaya, the Buddhist monk's robe, which is one of the traditional Korean costumes that has kept it original form, as well as it being the most symbolic ritual costume in Buddhism. The purpose of the study is to see the different types of Kasaya, and the transitions it has gone through since Mid Joseon Dynasty. The analysis was performed after categorizing Kasaya in the following manner: layers, the way to wear, symbolism in construction, sewing, etc. Having a variety of Ilwolguangcheop(日月光貼) is a feature of Korean Red Kasaya. In the beginning, Its shape was very similar to shape of Hyungbae(胸背), and this was a royal gift and had the same meaning as an official uniform for a Buddhist monk. So designs of the Cheop(貼) could have been transformed from those of Hyungbae with a Buddhist twist. The conclusion of the study is as follows: Double layered Kasaya shows its transition from double layer to single layer. The fastening ornaments have been simplified in all materials from Yeongja(纓子). The latch type and three-paired Yeongja type transformed into hook type and one-paired Yeongja type. Color is the most common feature above all, and it is mainly in red. The form of Korean Kasaya has a significant relation with development of Buddhism. The integration of the Zen sect would have influenced the integration of Kasaya, which shows diversity throughout the period.

Disturbed State Modeling for Fully Saturated Sand under Dynamic Load

  • Park, Inn-Joon;Kim, Soo-Il
    • Geotechnical Engineering
    • /
    • v.14 no.3
    • /
    • pp.47-62
    • /
    • 1998
  • The disturbed state concept (DSC) proposed here is based on the idea that a deforming material element can be treated as a mixture of two constituent parts in the relative intact (Rl) and fully adjusted (FA) states, referred to as reference states. Based on this idea, DSC provides a unified constitutive model for the characteristics of saturated sands under cyclic loading. The model parameters for saturated sands are evaluated by using data from truly triaxial test device, The laboratory test results are also used for the verification of D SC model. In general, the model predictions are found to provide satisfactory correlation with the test results. From the results of this research, it can be stated that the DSC model is capable of characterizing the cyclic behavior of saturated sands under dynamic loading.

  • PDF

Extraction of Classification Boundary for Fuzzy Partitions and Its Application to Pattern Classification (퍼지 분할을 위한 분류 경계의 추출과 패턴 분류에의 응용)

  • Son, Chang-S.;Seo, Suk-T.;Chung, Hwan-M.;Kwon, Soon-H.
    • Journal of the Korean Institute of Intelligent Systems
    • /
    • v.18 no.5
    • /
    • pp.685-691
    • /
    • 2008
  • The selection of classification boundaries in fuzzy rule- based classification systems is an important and difficult problem. So various methods based on learning processes such as neural network, genetic algorithm, and so on have been proposed for it. In a previous study, we pointed out the limitation of the methods and discussed a method for fuzzy partitioning in the overlapped region on feature space in order to overcome the time-consuming when the additional parameters for tuning fuzzy membership functions are necessary. In this paper, we propose a method to determine three types of classification boundaries(i.e., non-overlapping, overlapping, and a boundary point) on the basis of statistical information of the given dataset without learning by extending the method described in the study. Finally, we show the effectiveness of the proposed method through experimental results applied to pattern classification problems using the modified IRIS and standard IRIS datasets.