A new robust method for finding the parameters of Engen’s six-port-to-four-port reduction algorithm for sixport reflectometer calibration has been developed. Like other previously published methods, it uses a minimum of five loads with an unknown but constant absolute value of the reflection coefficient and unknown but well-distributed phases. However, the quality of the parameter estimates is ...

OBJECTIVES This is to report treatment results of major salivary gland cancer by surgery with or without postoperative radiation therapy (PORT). METHODS Between March 1995 and January 2006, 94 patients with primary major salivary cancer underwent curative surgical resection at Samsung Medical Center. The parotid gland was the most commonly involved (73, 77.7%), followed by the submandibular a...

OBJECTIVES With increasing surgeon experience, laparoscopic cholecystectomy has undergone many refinements including reduction in port number and size. Three-port laparoscopic cholecystectomy has been reported to be safe and feasible in various clinical trials. However, whether it offers any additional advantages remains controversial. This study reports a randomized trial that compared the cli...

Port-a-cath is a widely used device in patients with long-term venous access demand such as frequent or continuous administration of medications such as Enzyme Replacement Therapy (ERT), chemotherapy delivery, blood transfusions, blood products, and fluids. Patients with Lysosomal Storage Diseases (LSDs) often require recurrent courses of ERT. We reviewed our experience of using port-a-caths in...

BACKGROUND For many years, subcutaneous therapeutic port system was known as a major route to access central veins. However, significant complications have been reported through recent years. One of the most important complications of subcutaneous port implantation is skin necrosis. In order to decrease this complication, we would like to introduce subpectoral fascia port implantation through t...

The microwave circuit simulator MMICAD can be used to analyze and optimize the small-signal conversion and noise performance of a mixer-preamplifier. The mixer is represented as a noisy five-frequency five-port network using imported conversion and noise correlation matrices, with MMICAD’s NCSCOR5 element which contains five correlated noise sources.

OBJECTIVE Our purpose is to report and review the results and early complications of subcutaneous infusion port placement by our interventional radiology department. MATERIALS AND METHODS Three-hundred twenty-five subcutaneous infusion ports were placed in 320 patients between January 2005 and May 2010. Ports were placed under both general and local anesthesia. Five patients were catheterized...

background: tissue expanders are devices which are used to create enough skin to form suitable flap in restoration of great skin deficiencies which are not modified initially. the current study aimed at investigating the patients’ satisfaction and the complications such as rupture, hematoma, wound infection, seroma, leakage, chronic pain, and expander expose of internal (implanted under the ski...

this research uses computational modeling to explore another method to increase diesel engine performance while maintaining low pollutant emission levels. previous studies have shown that injection-rate profiles and injector configurations play important roles on the performance and emissions of particulate and nox in di diesel engines. since the most important engine design parameters, includi...