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서병규,김종수 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.1
TSP(Traveling Salesman Problem) is a famous problem in Operations Research fields due to its applicability to various problems. It is also well-known that the problem is hard to solve in reasonable time, since it is in the NP-Complete class. Hence it is desired to develop heuristics which have polynominal complexity and also solve the problem to near-optimality. This paper presents a heuristic algorithm for TSP using the concept of dynamic programming. The proposed method has the complexity of O(N^3), and gives improved solutions than other well-known algorithms in our extensive computational experiments.
서병규 대한의사협회 2009 대한의사협회지 Vol.52 No.8
Adolescence marks the transition from childhood to adult life and is characterized by a myriad of physical and emotional changes. The peak height velocity occurs during this period, secondary sexual characteristics emerge to accomplish sexual maturity, and the development of abstract thinking gives the child a fully independent person. Puberty begins with the activation of the hypothalamus-pituitary -gonadal axis, resulting in the release of gonadotropin-releasing hormone from the hypothalamus, and the subsequent production of the gonadotropins, luteinizing hormone and follicle-stimulating hormone, from the pituitary, and the sex hormones from the testes and ovaries. Increased levels of the sex hormones stimulate the production of growth hormone and insulin-like growth factor -Ⅰ, leading to the growth spurt. As a result, an endo-crine problem during puberty with a single hormone may lead to abnormalities of other hormones that are inextricably linked, culminating in disorders of growth and pubertal development. Common endocrine problems of childhood and adolescence, including thyroid disorders, precocious puberty, premature thelarche, which may be classified as a variant of precocious puberty, and gynecomastia, have been explained in some detail. Delayed treatment of thyroid disorders may lead to emotional disability and growth retardation. Possible causes of precocious puberty should be explored and treated in order to minimize endocrine complications. Potential cases of normal physiologic development such as premature thelarche and gynecomastia should be diagnosed accurately to avert a series of unnecessary diagnostic tests and attempts at treatment.
두부 손상후 재발성 세균성 뇌막염과 점액낭종을 보인 환아 1예
서병규,정승연,최성동,전성수,윤소연,강진한 대한감염학회 1998 감염 Vol.30 No.6
저자들은 뇌척수액 비루를 동반한 두부외상이 있은 후 3회에 걸친 재발성 세균성 뇌막염으로 입원치료 받은 남아에서 부비동 전산화 단층촬영을 시행하여 우측 전두동과 전사골동내의 점액낭종 및 우측 전두동 후벽부위의 골절을 확인하였으나 보호자의 동의가 없어 수술을 시행하지 못하고 항생제의 투여와 보존적 요법으로 치료하고 폐렴구균 및 b형 인플루엔자균 백신 접종을 시행한 1례를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. Recurrent bacterial meningitis can be caused by acquired or congenital anatomic defects, infection, or alterations in immune mechanism. Intracranial anatomical defects possibly combined with trauma can be the major cause of recurrent bacterial meningitis. Mucocele is a chronic, expansile and cyst-like lesion of the paranasal sinuses, most frequently found in the frontal sinus containing sterile mucoid secretions. Secondary infection of a mucocele may create a pyocele. Although pathogenesis of a primary mucoceles remains uncertain, causatives factors of secondary mucoceles have been suggested to include chronic inflammation, trauma, allergy and obstructing tumors. We experienced a case of recurrent bacterial meaningitis with frontal sinus mucocele, which might be secondary to cranial trauma.
Catch-up growth and catch-up fat in children born small for gestational age
조원경,서병규 대한소아청소년과학회 2016 Clinical and Experimental Pediatrics (CEP) Vol.59 No.1
Infants born small for gestational age (SGA) are at increased risk of perinatal morbidity, persistent short stature, and metabolic alterations in later life. Recent studies have focused on the association between birth weight (BW) and later body composition. Some reports suggest that fetal nutrition, as reflected by BW, may have an inverse programing effect on abdominal adiposity later in life. This inverse association between BW and abdominal adiposity in adults may contribute to insulin resistance. Rapid weight gain during infancy in SGA children seemed to be associated with increased fat mass rather than lean mass. Early catch-up growth after SGA birth rather than SGA itself has been noted as a cardiovascular risk factor in later life. Children who are born SGA also have a predisposition to accumulation of fat mass, particularly intra-abdominal fat. It is not yet clear whether this predisposition is due to low BW itself, rapid postnatal catch-up growth, or a combination of both. In this report, we review the published literature on central fat accumulation and metabolic consequences of being SGA, as well as the currently popular research area of SGA, including growth aspects.