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가정환경변인이 유아 비만에 미치는 종단적 영향: 건강행동의 매개효과
김지형 한국영유아보육학회 2023 한국영유아보육학 Vol.- No.141
본 연구는 유아 비만과의 관련성이 보고된 가정환경, 유아 건강행동의 순차적 관계를 살펴보고, 가정환경과 유아 비만과의 종단적 관계에서 건강행동의 매개효과를 살펴보고자 하였다. 이를 위해 한국아동패널 5∼7차년도에 조사에 참여한 1,543명의 자료를 활용하였다. 가정환경은 어머니의 양육행동와 가정 내 학습자료 및 물리적 환경으로 파악하였고, 유아의 건강행동은 식습관, 수면시간, 전자매체 사용시간으로 측정하였다. 경로분석 결과, 통제적, 온정적 양육행동과 가정의 물리적 환경은 유아의 건강한 식습관을 예측하는 것으로 나타났다. 또한 온정적 양육행동과 학습자료는 유아의 긴 수면시간과 짧은 전자매체 사용 시간을 예측했고, 이는 유아의 비만 가능성을 줄여주는 것으로 나타났다. 다음으로 유아의 건강행동 중 올바른 식습관과 전자매체사용은 온정적 양육행동과 정상체중, 학습자료와 정상체중간의 관계를 유의하게 매개하는 것으로 나타났다. 이러한 결과는 비만의 예방과 중재를 위해서 가정환경 내 개입을 통해 유아의 올바른 식습관 형성을 돕고, 전자매체 사용 시간을 줄이는 것이 효과적임을 시사한다.
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Conceptual design and analysis of rotor for a 1-kW-Class HTS rotating machine
김지형,C. J. Hyeon,H. L. Quach,Y. S. Chae,J. H. Moon,C.-J. Boo,김호민 한국초전도.저온공학회 2017 한국초전도저온공학회논문지 Vol.19 No.4
This paper presents a conceptual design and analysis for a 1-kW-class high-temperature superconducting rotating machine (HTSRM) rotor. The designed prototype is a small-scale integration system of a HTSRM and a HTS contactless rotary excitation device (CRED). Technically, CRED and HTSRM are connected in the same shaft, and it effectively charges the HTS coils of the rotor field winding by pumping fluxes via a non-contact method. HTS coils in rotor pole body and toroidal HTS wire in CRED rotor are cooled and operated by liquid nitrogen in cryogen tank located in inner-most of rotor. Therefore, it is crucial to securely maintain the thermal stability of cryogenic environment inside rotor. Especially, we critically consider not only on mechanical characteristics of the rotor but also on cryogenic thermal characteristics. In this paper, we conduct two main tasks covering optimizing a conceptual design and performing operational characteristics. First, rotor parameters are conceptually designed by analytical design codes. These parameters consider to mechanical and thermal performances such as mechanical strength, mechanical rigidity, and thermal heat losses of the rotor. Second, mechanical and thermal characteristics of rotor for 1-kW-class HTSRM are analyzed to verify the feasible operation conditions. Hence, three-dimensional finite element analysis (3D-FEA) method is used to perform these analyses in ANSYS-Workbench platform.
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Enhanced deep soft interference cancellation for multiuser symbol detection
김지형,김정현,이문식 한국전자통신연구원 2023 ETRI Journal Vol.45 No.6
The detection of all the symbols transmitted simultaneously in multiuser systems using limited wireless resources is challenging. Traditional model-based methods show high performance with perfect channel state information (CSI); however, severe performance degradation will occur if perfect CSI cannot be acquired. In contrast, data-driven methods perform slightly worse than model-based methods in terms of symbol error ratio performance in perfect CSI states; however, they are also able to overcome extreme performance degradation in imperfect CSI states. This study proposes a novel deep learning-based method by improving a state-of-the-art data-driven technique called deep soft interference cancellation (DSIC). The enhanced DSIC (EDSIC) method detects multiuser symbols in a fully sequential manner and ses an efficient neural network structure to ensure high performance. Additionally, error-propagation mitigation techniques are used to ensure robustness against channel uncertainty. The EDSIC guarantees a performance that is very close to the optimal performance of the existing model-based methods in perfect CSI environments and the best performance in imperfect CSI environments.
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김지형 대한의사협회 2013 대한의사협회지 Vol.56 No.11
In hallux valgus, one of the most common conditions affecting the forefoot, the first metatarsophalangeal joint is progressively subluxed due to lateral deviation of the hallux and medial deviation of the first metatarsal. Patients usually complain of medial prominence pain, commonly referred to as “bunion pain,” plantar keratotic lesions, and lesser toe deformities such as hammer toe or claw toe deformities. The etiology of hallux valgus is multifactorial. Narrow highheeled shoes or excessive weight-bearing have been suggested to be extrinsic factors contributing to the condition, and many other intrinsic factors also exist, such as genetics, ligamentous laxity, metatarsus primus varus, pes planus, functional hallux limitus, sexual dimorphism, age,metatarsal morphology, first-ray hypermobility, and tight Achilles tendon. When we evaluate patients with hallux valgus, careful history taking and meticulous examination are necessary. On the radiographic evaluation, we routinely measure the hallux valgus angle, intermetatarsal angle,and distal metatarsal articular angle, which are valuable parameters in decision making for bunion surgery. To prevent the development and progression of hallux valgus, a soft leather shoe with a wide toe box is usually recommended. The use of a toe separator or bunion splint may help in relieving symptoms. The purpose of hallux valgus surgery is to correct the deformity and maintain a biomechanically functional foot. When we decide on an adequate surgical option,we should consider the patient’s subjective symptoms, the expectations of the patient, the degree of the de-formity, and the radiographic measurements in order to correct the deformity and prevent complications after surgery.
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