Hyun Jin Kim

A 140-GHz wideband array antenna-in-package (AiP) that uses multimode resonance is proposed based on a low-profile multilayer printed circuit board (PCB), which can be incorporated with flip-chip technology and an integrated transceiver. Using the multiple resonances of a patch and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda $ </tex-math></inline-formula> /4 monopole-type feeder, a simulated impeda

This study was conducted to compare the growth and flowering characters of a dwarf purple loosestrife and purple loosestrife (Lythrum salicaria L.), and to determine the optimal photoperiod of dwarf purple loosestrife for forcing cultivation. Dwarf purple loosestrife was grown under natural sunlight (from 08:30 to18:30 HR, 10 h) and additional artificial lighting [0, 2, 3, 4, 6, or 14 h of continual light, or night interruption of 4 h (NI)] in a greenhouse. Growth and development of dwarf purple

This article describes the design and considerations for millimeter-wave (mmWave) 5G antenna modules embedded in a tablet device. The antenna module consists of eight-chain broadside antenna array and two pairs of four-chain endfire antenna array. A dual-polarized air-filled stacked patch antenna is designed for the broadside patch antenna. Although the performance can be deteriorated due to a plastic cover, the proposed antenna enables an adaptable design for a dielectric cover. A novel surface

The diagnostic and prognostic potential of an onco-metabolite, 2-hydroxyglutarate (2HG) as a proton magnetic resonance spectroscopy (1H-MRS) detectable biomarker of the isocitrate dehydrogenase (IDH)-mutated (IDH-MT) gliomas has drawn attention of neuroradiologists recently. However, due to severe spectral overlap with background signals, quantification of 2HG can be very challenging. In this technical review for neuroradiologists, first, the biochemistry of 2HG and its significance in the diagn

A 4 × 4 multi-feed array antenna-in-package (AiP) is presented for high-power combinations and various polarization syntheses, which operates at D-band. The multi-feed antenna element was designed considering N-number (K × K) of array antennas from the beginning. Hence, the proposed antenna can provide four input ports while achieving impedance bandwidth of 27%, port-to-port isolation higher than 10 dB, and cross-polarization discrimination (XPD) over 20 dB. In addition, the power combination an

The purpose of this study was to identify locus of control and school-related adjustment of agricultural high school students, and to identify relationship between locus of control and school-related adjustment of agricultural high school students.This study was conducted through reviewing literature and surveying subjects about locus of control and school-related adjustment of agricultural high school students by using the questionnaires.The major findings in this study were as follows:1) There

Fusarium spp. were isolated from the postharvest fruit rot of oriental melon fruits at commercial fruit markets in Korea during 2001 to 2003. The decayed fruits were covered with the fungal mycelia and eventually soft rotted. The disease started at the fruit stalk area, the calyx end of the fruit and skin of fruit. As the disease advanced, white to pinkish mycelia covered with the surface of decayed fruit. The cultural and morphological characteristic of Fusarium spp. were compared with descript

This paper presents an accurate analysis technique to estimate indoor propagation performance of a wireless local area network (WLAN) module in a commercial TV set. In particular, a hybrid technique is proposed which uses ray tracing method combined with the finite difference time domain (FDTD) method. FDTD method in a specific source regions and ray tracing method is applied for the rest of the area. The FDTD simulation is used for analyzing an accurate WLAN source region which consists of a WL

볼트접합 앵글을 사용한 선조립-SRC 합성기둥(이하 PSRC 합성기둥)의 구조성능을 평가하기 위하여 PSRC 기둥실험체 6개와 일반SRC 기둥실험체 2개에 대하여 편심축 압축실험을 수행하였다. 횡보강재의 수직간격 및 단면형상과 축하중의 편심율을 실험변수로 고려하였다. 실험결과, 편심율이 큰 경우 PSRC 실험체는 단면 코너에 위치한 고강성 앵글로 인하여 압축하중 재하능력 및 변형능력이 기존 SRC 실험체보다 향상되었다. PSRC 기둥 실험체에서 횡방향 강판의 좁은 횡보강 간격과 Z형 단면의 횡방향 강판은 우수한 횡구속력을 제공하였으며, 하중재하능력을 향상시켰다. 실험 및 수치해석을 통한 합성기둥의 휨·압축 강도는 현행설계기준에 의한 휨-압축 상관도를 상회하였다. 수치해석결과는각 실험체의 강성, 최대강도, 최대하중 이후 강도감소거동을 비교적 잘 예측하였다.

Gymnaster koraiensis (Nakai) Kitam. seeds had low germination or lack of germination uniformity under low temperature conditions. To improve the final germination percentage (FGP) of G. koraiensis seeds under low temperatures, we investigated proper priming treatments. Priming with KNO3 solutions enhanced FGP when G. koraiensis seeds were germinated at 12℃. As the concentration of KNO3 rose, FGP was increased, but there was no significant difference among the three concentrations (0.1, 0.2, or 0

이 연구는 헌법재판소가 대의 민주주의에서 대표(representation)를 구현할 수있는 행위자로 확장되고 있다는 점을 주장하고 있다. 헌법재판소의 행위자 확대현상을 민주주의 틀 속에서 어떻게 해석해내느냐 하는 것이 이 연구의 궁극적인목적이다. 헌법재판소는 탄핵 과정을 통해 국회와 대통령 그리고 국민 여론과의관계에서 전략적 판단을 통해 제도적 기관으로서의 위치를 공고히 하고 있으며 민주적 정당성을 담보하는 행위자로 민주적 역할을 확장하고 있다. 정치 행위자의다양성과 의사 결정 과정의 포용성이 수용될 때 사법심사의 민주적 정당성이 확보될 수 있는 통로가 마련될 수 있다. 헌법재판소가 정치 과정에서 행위자로 기능하고 있다는 것을 합리적으로 주장하기 위해서 이 연구는 선거와 투표를 중심으로해석하는 정치 과정에 대한 협소한 관점을 확대하고 중첩적 다수를 강조하는 이원적 민주주의관과 헌정 민주주의의 통합을 그 대안으로 제시하고 있다.

A homoerotic reading of the thirteenth-century Prose Lancelot, arguably the best and most sophisticated of all medieval romances ever written, lays bare a hitherto-disregarded ideological stance of courtly love. Through the first half of the Prose Lancelot, which is known as “Lancelot without the Grail,” Lancelot’s love for Guinevere is counterbalanced by Galehot’s equally passionate infatuation with Lancelot. While exploiting the well-established romantic rivalry between love and friendship to

The germination response of the Korean daisy (Aster koraiensis) seeds was evaluated under conditions of low temperature (12℃) to determine the effects of dry storage duration, GA (GA3 and GA4+7), and priming. The effects of priming on germination at alternating temperatures (8/2, 15/9, 22/16, or 29/23℃) were also investigated. In seeds collected in 2007, the final germination percentage (FGP) of untreated seeds at constant 12℃ was 24, 29, and 37% for 3, 5, and 8 months stored seeds, respectively